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authorrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
commit066ea7fd88d49cb456f74da71dbe875e4fc0aabb (patch)
tree8fb30cb152c4dc191be47fa043d2e6f5ea38c7ba /generic/tkImgPhoto.c
parent13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (diff)
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+/*
+ * tkImgPhoto.c --
+ *
+ * Implements images of type "photo" for Tk. Photo images are
+ * stored in full color (24 bits per pixel) and displayed using
+ * dithering if necessary.
+ *
+ * Copyright (c) 1994 The Australian National University.
+ * Copyright (c) 1994-1997 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * Author: Paul Mackerras (paulus@cs.anu.edu.au),
+ * Department of Computer Science,
+ * Australian National University.
+ *
+ * SCCS: @(#) tkImgPhoto.c 1.60 97/08/08 11:32:46
+ */
+
+#include "tkInt.h"
+#include "tkPort.h"
+#include "tclMath.h"
+#include <ctype.h>
+
+/*
+ * Declaration for internal Xlib function used here:
+ */
+
+extern _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image));
+
+/*
+ * A signed 8-bit integral type. If chars are unsigned and the compiler
+ * isn't an ANSI one, then we have to use short instead (which wastes
+ * space) to get signed behavior.
+ */
+
+#if defined(__STDC__) || defined(_AIX)
+ typedef signed char schar;
+#else
+# ifndef __CHAR_UNSIGNED__
+ typedef char schar;
+# else
+ typedef short schar;
+# endif
+#endif
+
+/*
+ * An unsigned 32-bit integral type, used for pixel values.
+ * We use int rather than long here to accommodate those systems
+ * where longs are 64 bits.
+ */
+
+typedef unsigned int pixel;
+
+/*
+ * The maximum number of pixels to transmit to the server in a
+ * single XPutImage call.
+ */
+
+#define MAX_PIXELS 65536
+
+/*
+ * The set of colors required to display a photo image in a window depends on:
+ * - the visual used by the window
+ * - the palette, which specifies how many levels of each primary
+ * color to use, and
+ * - the gamma value for the image.
+ *
+ * Pixel values allocated for specific colors are valid only for the
+ * colormap in which they were allocated. Sets of pixel values
+ * allocated for displaying photos are re-used in other windows if
+ * possible, that is, if the display, colormap, palette and gamma
+ * values match. A hash table is used to locate these sets of pixel
+ * values, using the following data structure as key:
+ */
+
+typedef struct {
+ Display *display; /* Qualifies the colormap resource ID */
+ Colormap colormap; /* Colormap that the windows are using. */
+ double gamma; /* Gamma exponent value for images. */
+ Tk_Uid palette; /* Specifies how many shades of each primary
+ * we want to allocate. */
+} ColorTableId;
+
+/*
+ * For a particular (display, colormap, palette, gamma) combination,
+ * a data structure of the following type is used to store the allocated
+ * pixel values and other information:
+ */
+
+typedef struct ColorTable {
+ ColorTableId id; /* Information used in selecting this
+ * color table. */
+ int flags; /* See below. */
+ int refCount; /* Number of instances using this map. */
+ int liveRefCount; /* Number of instances which are actually
+ * in use, using this map. */
+ int numColors; /* Number of colors allocated for this map. */
+
+ XVisualInfo visualInfo; /* Information about the visual for windows
+ * using this color table. */
+
+ pixel redValues[256]; /* Maps 8-bit values of red intensity
+ * to a pixel value or index in pixelMap. */
+ pixel greenValues[256]; /* Ditto for green intensity */
+ pixel blueValues[256]; /* Ditto for blue intensity */
+ unsigned long *pixelMap; /* Actual pixel values allocated. */
+
+ unsigned char colorQuant[3][256];
+ /* Maps 8-bit intensities to quantized
+ * intensities. The first index is 0 for
+ * red, 1 for green, 2 for blue. */
+} ColorTable;
+
+/*
+ * Bit definitions for the flags field of a ColorTable.
+ * BLACK_AND_WHITE: 1 means only black and white colors are
+ * available.
+ * COLOR_WINDOW: 1 means a full 3-D color cube has been
+ * allocated.
+ * DISPOSE_PENDING: 1 means a call to DisposeColorTable has
+ * been scheduled as an idle handler, but it
+ * hasn't been invoked yet.
+ * MAP_COLORS: 1 means pixel values should be mapped
+ * through pixelMap.
+ */
+
+#define BLACK_AND_WHITE 1
+#define COLOR_WINDOW 2
+#define DISPOSE_PENDING 4
+#define MAP_COLORS 8
+
+/*
+ * Definition of the data associated with each photo image master.
+ */
+
+typedef struct PhotoMaster {
+ Tk_ImageMaster tkMaster; /* Tk's token for image master. NULL means
+ * the image is being deleted. */
+ Tcl_Interp *interp; /* Interpreter associated with the
+ * application using this image. */
+ Tcl_Command imageCmd; /* Token for image command (used to delete
+ * it when the image goes away). NULL means
+ * the image command has already been
+ * deleted. */
+ int flags; /* Sundry flags, defined below. */
+ int width, height; /* Dimensions of image. */
+ int userWidth, userHeight; /* User-declared image dimensions. */
+ Tk_Uid palette; /* User-specified default palette for
+ * instances of this image. */
+ double gamma; /* Display gamma value to correct for. */
+ char *fileString; /* Name of file to read into image. */
+ char *dataString; /* String value to use as contents of image. */
+ char *format; /* User-specified format of data in image
+ * file or string value. */
+ unsigned char *pix24; /* Local storage for 24-bit image. */
+ int ditherX, ditherY; /* Location of first incorrectly
+ * dithered pixel in image. */
+ TkRegion validRegion; /* Tk region indicating which parts of
+ * the image have valid image data. */
+ struct PhotoInstance *instancePtr;
+ /* First in the list of instances
+ * associated with this master. */
+} PhotoMaster;
+
+/*
+ * Bit definitions for the flags field of a PhotoMaster.
+ * COLOR_IMAGE: 1 means that the image has different color
+ * components.
+ * IMAGE_CHANGED: 1 means that the instances of this image
+ * need to be redithered.
+ */
+
+#define COLOR_IMAGE 1
+#define IMAGE_CHANGED 2
+
+/*
+ * The following data structure represents all of the instances of
+ * a photo image in windows on a given screen that are using the
+ * same colormap.
+ */
+
+typedef struct PhotoInstance {
+ PhotoMaster *masterPtr; /* Pointer to master for image. */
+ Display *display; /* Display for windows using this instance. */
+ Colormap colormap; /* The image may only be used in windows with
+ * this particular colormap. */
+ struct PhotoInstance *nextPtr;
+ /* Pointer to the next instance in the list
+ * of instances associated with this master. */
+ int refCount; /* Number of instances using this structure. */
+ Tk_Uid palette; /* Palette for these particular instances. */
+ double gamma; /* Gamma value for these instances. */
+ Tk_Uid defaultPalette; /* Default palette to use if a palette
+ * is not specified for the master. */
+ ColorTable *colorTablePtr; /* Pointer to information about colors
+ * allocated for image display in windows
+ * like this one. */
+ Pixmap pixels; /* X pixmap containing dithered image. */
+ int width, height; /* Dimensions of the pixmap. */
+ schar *error; /* Error image, used in dithering. */
+ XImage *imagePtr; /* Image structure for converted pixels. */
+ XVisualInfo visualInfo; /* Information about the visual that these
+ * windows are using. */
+ GC gc; /* Graphics context for writing images
+ * to the pixmap. */
+} PhotoInstance;
+
+/*
+ * The following data structure is used to return information
+ * from ParseSubcommandOptions:
+ */
+
+struct SubcommandOptions {
+ int options; /* Individual bits indicate which
+ * options were specified - see below. */
+ char *name; /* Name specified without an option. */
+ int fromX, fromY; /* Values specified for -from option. */
+ int fromX2, fromY2; /* Second coordinate pair for -from option. */
+ int toX, toY; /* Values specified for -to option. */
+ int toX2, toY2; /* Second coordinate pair for -to option. */
+ int zoomX, zoomY; /* Values specified for -zoom option. */
+ int subsampleX, subsampleY; /* Values specified for -subsample option. */
+ char *format; /* Value specified for -format option. */
+};
+
+/*
+ * Bit definitions for use with ParseSubcommandOptions:
+ * Each bit is set in the allowedOptions parameter on a call to
+ * ParseSubcommandOptions if that option is allowed for the current
+ * photo image subcommand. On return, the bit is set in the options
+ * field of the SubcommandOptions structure if that option was specified.
+ *
+ * OPT_FORMAT: Set if -format option allowed/specified.
+ * OPT_FROM: Set if -from option allowed/specified.
+ * OPT_SHRINK: Set if -shrink option allowed/specified.
+ * OPT_SUBSAMPLE: Set if -subsample option allowed/spec'd.
+ * OPT_TO: Set if -to option allowed/specified.
+ * OPT_ZOOM: Set if -zoom option allowed/specified.
+ */
+
+#define OPT_FORMAT 1
+#define OPT_FROM 2
+#define OPT_SHRINK 4
+#define OPT_SUBSAMPLE 8
+#define OPT_TO 0x10
+#define OPT_ZOOM 0x20
+
+/*
+ * List of option names. The order here must match the order of
+ * declarations of the OPT_* constants above.
+ */
+
+static char *optionNames[] = {
+ "-format",
+ "-from",
+ "-shrink",
+ "-subsample",
+ "-to",
+ "-zoom",
+ (char *) NULL
+};
+
+/*
+ * The type record for photo images:
+ */
+
+static int ImgPhotoCreate _ANSI_ARGS_((Tcl_Interp *interp,
+ char *name, int argc, char **argv,
+ Tk_ImageType *typePtr, Tk_ImageMaster master,
+ ClientData *clientDataPtr));
+static ClientData ImgPhotoGet _ANSI_ARGS_((Tk_Window tkwin,
+ ClientData clientData));
+static void ImgPhotoDisplay _ANSI_ARGS_((ClientData clientData,
+ Display *display, Drawable drawable,
+ int imageX, int imageY, int width, int height,
+ int drawableX, int drawableY));
+static void ImgPhotoFree _ANSI_ARGS_((ClientData clientData,
+ Display *display));
+static void ImgPhotoDelete _ANSI_ARGS_((ClientData clientData));
+
+Tk_ImageType tkPhotoImageType = {
+ "photo", /* name */
+ ImgPhotoCreate, /* createProc */
+ ImgPhotoGet, /* getProc */
+ ImgPhotoDisplay, /* displayProc */
+ ImgPhotoFree, /* freeProc */
+ ImgPhotoDelete, /* deleteProc */
+ (Tk_ImageType *) NULL /* nextPtr */
+};
+
+/*
+ * Default configuration
+ */
+
+#define DEF_PHOTO_GAMMA "1"
+#define DEF_PHOTO_HEIGHT "0"
+#define DEF_PHOTO_PALETTE ""
+#define DEF_PHOTO_WIDTH "0"
+
+/*
+ * Information used for parsing configuration specifications:
+ */
+static Tk_ConfigSpec configSpecs[] = {
+ {TK_CONFIG_STRING, "-data", (char *) NULL, (char *) NULL,
+ (char *) NULL, Tk_Offset(PhotoMaster, dataString), TK_CONFIG_NULL_OK},
+ {TK_CONFIG_STRING, "-format", (char *) NULL, (char *) NULL,
+ (char *) NULL, Tk_Offset(PhotoMaster, format), TK_CONFIG_NULL_OK},
+ {TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL,
+ (char *) NULL, Tk_Offset(PhotoMaster, fileString), TK_CONFIG_NULL_OK},
+ {TK_CONFIG_DOUBLE, "-gamma", (char *) NULL, (char *) NULL,
+ DEF_PHOTO_GAMMA, Tk_Offset(PhotoMaster, gamma), 0},
+ {TK_CONFIG_INT, "-height", (char *) NULL, (char *) NULL,
+ DEF_PHOTO_HEIGHT, Tk_Offset(PhotoMaster, userHeight), 0},
+ {TK_CONFIG_UID, "-palette", (char *) NULL, (char *) NULL,
+ DEF_PHOTO_PALETTE, Tk_Offset(PhotoMaster, palette), 0},
+ {TK_CONFIG_INT, "-width", (char *) NULL, (char *) NULL,
+ DEF_PHOTO_WIDTH, Tk_Offset(PhotoMaster, userWidth), 0},
+ {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
+ (char *) NULL, 0, 0}
+};
+
+/*
+ * Hash table used to hash from (display, colormap, palette, gamma)
+ * to ColorTable address.
+ */
+
+static Tcl_HashTable imgPhotoColorHash;
+static int imgPhotoColorHashInitialized;
+#define N_COLOR_HASH (sizeof(ColorTableId) / sizeof(int))
+
+/*
+ * Pointer to the first in the list of known photo image formats.
+ */
+
+static Tk_PhotoImageFormat *formatList = NULL;
+
+/*
+ * Forward declarations
+ */
+
+static int ImgPhotoCmd _ANSI_ARGS_((ClientData clientData,
+ Tcl_Interp *interp, int argc, char **argv));
+static int ParseSubcommandOptions _ANSI_ARGS_((
+ struct SubcommandOptions *optPtr,
+ Tcl_Interp *interp, int allowedOptions,
+ int *indexPtr, int argc, char **argv));
+static void ImgPhotoCmdDeletedProc _ANSI_ARGS_((
+ ClientData clientData));
+static int ImgPhotoConfigureMaster _ANSI_ARGS_((
+ Tcl_Interp *interp, PhotoMaster *masterPtr,
+ int argc, char **argv, int flags));
+static void ImgPhotoConfigureInstance _ANSI_ARGS_((
+ PhotoInstance *instancePtr));
+static void ImgPhotoSetSize _ANSI_ARGS_((PhotoMaster *masterPtr,
+ int width, int height));
+static void ImgPhotoInstanceSetSize _ANSI_ARGS_((
+ PhotoInstance *instancePtr));
+static int IsValidPalette _ANSI_ARGS_((PhotoInstance *instancePtr,
+ char *palette));
+static int CountBits _ANSI_ARGS_((pixel mask));
+static void GetColorTable _ANSI_ARGS_((PhotoInstance *instancePtr));
+static void FreeColorTable _ANSI_ARGS_((ColorTable *colorPtr));
+static void AllocateColors _ANSI_ARGS_((ColorTable *colorPtr));
+static void DisposeColorTable _ANSI_ARGS_((ClientData clientData));
+static void DisposeInstance _ANSI_ARGS_((ClientData clientData));
+static int ReclaimColors _ANSI_ARGS_((ColorTableId *id,
+ int numColors));
+static int MatchFileFormat _ANSI_ARGS_((Tcl_Interp *interp,
+ Tcl_Channel chan, char *fileName,
+ char *formatString,
+ Tk_PhotoImageFormat **imageFormatPtr,
+ int *widthPtr, int *heightPtr));
+static int MatchStringFormat _ANSI_ARGS_((Tcl_Interp *interp,
+ char *string, char *formatString,
+ Tk_PhotoImageFormat **imageFormatPtr,
+ int *widthPtr, int *heightPtr));
+static void Dither _ANSI_ARGS_((PhotoMaster *masterPtr,
+ int x, int y, int width, int height));
+static void DitherInstance _ANSI_ARGS_((PhotoInstance *instancePtr,
+ int x, int y, int width, int height));
+
+#undef MIN
+#define MIN(a, b) ((a) < (b)? (a): (b))
+#undef MAX
+#define MAX(a, b) ((a) > (b)? (a): (b))
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_CreatePhotoImageFormat --
+ *
+ * This procedure is invoked by an image file handler to register
+ * a new photo image format and the procedures that handle the
+ * new format. The procedure is typically invoked during
+ * Tcl_AppInit.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The new image file format is entered into a table used in the
+ * photo image "read" and "write" subcommands.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_CreatePhotoImageFormat(formatPtr)
+ Tk_PhotoImageFormat *formatPtr;
+ /* Structure describing the format. All of
+ * the fields except "nextPtr" must be filled
+ * in by caller. Must not have been passed
+ * to Tk_CreatePhotoImageFormat previously. */
+{
+ Tk_PhotoImageFormat *copyPtr;
+
+ copyPtr = (Tk_PhotoImageFormat *) ckalloc(sizeof(Tk_PhotoImageFormat));
+ *copyPtr = *formatPtr;
+ copyPtr->name = (char *) ckalloc((unsigned) (strlen(formatPtr->name) + 1));
+ strcpy(copyPtr->name, formatPtr->name);
+ copyPtr->nextPtr = formatList;
+ formatList = copyPtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoCreate --
+ *
+ * This procedure is called by the Tk image code to create
+ * a new photo image.
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * The data structure for a new photo image is allocated and
+ * initialized.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ImgPhotoCreate(interp, name, argc, argv, typePtr, master, clientDataPtr)
+ Tcl_Interp *interp; /* Interpreter for application containing
+ * image. */
+ char *name; /* Name to use for image. */
+ int argc; /* Number of arguments. */
+ char **argv; /* Argument strings for options (doesn't
+ * include image name or type). */
+ Tk_ImageType *typePtr; /* Pointer to our type record (not used). */
+ Tk_ImageMaster master; /* Token for image, to be used by us in
+ * later callbacks. */
+ ClientData *clientDataPtr; /* Store manager's token for image here;
+ * it will be returned in later callbacks. */
+{
+ PhotoMaster *masterPtr;
+
+ /*
+ * Allocate and initialize the photo image master record.
+ */
+
+ masterPtr = (PhotoMaster *) ckalloc(sizeof(PhotoMaster));
+ memset((void *) masterPtr, 0, sizeof(PhotoMaster));
+ masterPtr->tkMaster = master;
+ masterPtr->interp = interp;
+ masterPtr->imageCmd = Tcl_CreateCommand(interp, name, ImgPhotoCmd,
+ (ClientData) masterPtr, ImgPhotoCmdDeletedProc);
+ masterPtr->palette = NULL;
+ masterPtr->pix24 = NULL;
+ masterPtr->instancePtr = NULL;
+ masterPtr->validRegion = TkCreateRegion();
+
+ /*
+ * Process configuration options given in the image create command.
+ */
+
+ if (ImgPhotoConfigureMaster(interp, masterPtr, argc, argv, 0) != TCL_OK) {
+ ImgPhotoDelete((ClientData) masterPtr);
+ return TCL_ERROR;
+ }
+
+ *clientDataPtr = (ClientData) masterPtr;
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoCmd --
+ *
+ * This procedure is invoked to process the Tcl command that
+ * corresponds to a photo image. See the user documentation
+ * for details on what it does.
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ImgPhotoCmd(clientData, interp, argc, argv)
+ ClientData clientData; /* Information about photo master. */
+ Tcl_Interp *interp; /* Current interpreter. */
+ int argc; /* Number of arguments. */
+ char **argv; /* Argument strings. */
+{
+ PhotoMaster *masterPtr = (PhotoMaster *) clientData;
+ int c, result, index;
+ int x, y, width, height;
+ int dataWidth, dataHeight;
+ struct SubcommandOptions options;
+ int listArgc;
+ char **listArgv;
+ char **srcArgv;
+ unsigned char *pixelPtr;
+ Tk_PhotoImageBlock block;
+ Tk_Window tkwin;
+ char string[16];
+ XColor color;
+ Tk_PhotoImageFormat *imageFormat;
+ int imageWidth, imageHeight;
+ int matched;
+ Tcl_Channel chan;
+ Tk_PhotoHandle srcHandle;
+ size_t length;
+
+ if (argc < 2) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " option ?arg arg ...?\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ c = argv[1][0];
+ length = strlen(argv[1]);
+
+ if ((c == 'b') && (strncmp(argv[1], "blank", length) == 0)) {
+ /*
+ * photo blank command - just call Tk_PhotoBlank.
+ */
+
+ if (argc == 2) {
+ Tk_PhotoBlank(masterPtr);
+ } else {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " blank\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ } else if ((c == 'c') && (length >= 2)
+ && (strncmp(argv[1], "cget", length) == 0)) {
+ if (argc != 3) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " cget option\"",
+ (char *) NULL);
+ return TCL_ERROR;
+ }
+ Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs,
+ (char *) masterPtr, argv[2], 0);
+ } else if ((c == 'c') && (length >= 3)
+ && (strncmp(argv[1], "configure", length) == 0)) {
+ /*
+ * photo configure command - handle this in the standard way.
+ */
+
+ if (argc == 2) {
+ return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
+ configSpecs, (char *) masterPtr, (char *) NULL, 0);
+ }
+ if (argc == 3) {
+ return Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
+ configSpecs, (char *) masterPtr, argv[2], 0);
+ }
+ return ImgPhotoConfigureMaster(interp, masterPtr, argc-2, argv+2,
+ TK_CONFIG_ARGV_ONLY);
+ } else if ((c == 'c') && (length >= 3)
+ && (strncmp(argv[1], "copy", length) == 0)) {
+ /*
+ * photo copy command - first parse options.
+ */
+
+ index = 2;
+ memset((VOID *) &options, 0, sizeof(options));
+ options.zoomX = options.zoomY = 1;
+ options.subsampleX = options.subsampleY = 1;
+ options.name = NULL;
+ if (ParseSubcommandOptions(&options, interp,
+ OPT_FROM | OPT_TO | OPT_ZOOM | OPT_SUBSAMPLE | OPT_SHRINK,
+ &index, argc, argv) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if (options.name == NULL || index < argc) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " copy source-image ?-from x1 y1 x2 y2?",
+ " ?-to x1 y1 x2 y2? ?-zoom x y? ?-subsample x y?",
+ "\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Look for the source image and get a pointer to its image data.
+ * Check the values given for the -from option.
+ */
+
+ if ((srcHandle = Tk_FindPhoto(interp, options.name)) == NULL) {
+ Tcl_AppendResult(interp, "image \"", argv[2], "\" doesn't",
+ " exist or is not a photo image", (char *) NULL);
+ return TCL_ERROR;
+ }
+ Tk_PhotoGetImage(srcHandle, &block);
+ if ((options.fromX2 > block.width) || (options.fromY2 > block.height)
+ || (options.fromX2 > block.width)
+ || (options.fromY2 > block.height)) {
+ Tcl_AppendResult(interp, "coordinates for -from option extend ",
+ "outside source image", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Fill in default values for unspecified parameters.
+ */
+
+ if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
+ options.fromX2 = block.width;
+ options.fromY2 = block.height;
+ }
+ if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
+ width = options.fromX2 - options.fromX;
+ if (options.subsampleX > 0) {
+ width = (width + options.subsampleX - 1) / options.subsampleX;
+ } else if (options.subsampleX == 0) {
+ width = 0;
+ } else {
+ width = (width - options.subsampleX - 1) / -options.subsampleX;
+ }
+ options.toX2 = options.toX + width * options.zoomX;
+
+ height = options.fromY2 - options.fromY;
+ if (options.subsampleY > 0) {
+ height = (height + options.subsampleY - 1)
+ / options.subsampleY;
+ } else if (options.subsampleY == 0) {
+ height = 0;
+ } else {
+ height = (height - options.subsampleY - 1)
+ / -options.subsampleY;
+ }
+ options.toY2 = options.toY + height * options.zoomY;
+ }
+
+ /*
+ * Set the destination image size if the -shrink option was specified.
+ */
+
+ if (options.options & OPT_SHRINK) {
+ ImgPhotoSetSize(masterPtr, options.toX2, options.toY2);
+ }
+
+ /*
+ * Copy the image data over using Tk_PhotoPutZoomedBlock.
+ */
+
+ block.pixelPtr += options.fromX * block.pixelSize
+ + options.fromY * block.pitch;
+ block.width = options.fromX2 - options.fromX;
+ block.height = options.fromY2 - options.fromY;
+ Tk_PhotoPutZoomedBlock((Tk_PhotoHandle) masterPtr, &block,
+ options.toX, options.toY, options.toX2 - options.toX,
+ options.toY2 - options.toY, options.zoomX, options.zoomY,
+ options.subsampleX, options.subsampleY);
+
+ } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
+ /*
+ * photo get command - first parse and check parameters.
+ */
+
+ if (argc != 4) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " get x y\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
+ || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
+ return TCL_ERROR;
+ }
+ if ((x < 0) || (x >= masterPtr->width)
+ || (y < 0) || (y >= masterPtr->height)) {
+ Tcl_AppendResult(interp, argv[0], " get: ",
+ "coordinates out of range", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Extract the value of the desired pixel and format it as a string.
+ */
+
+ pixelPtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3;
+ sprintf(string, "%d %d %d", pixelPtr[0], pixelPtr[1],
+ pixelPtr[2]);
+ Tcl_AppendResult(interp, string, (char *) NULL);
+ } else if ((c == 'p') && (strncmp(argv[1], "put", length) == 0)) {
+ /*
+ * photo put command - first parse the options and colors specified.
+ */
+
+ index = 2;
+ memset((VOID *) &options, 0, sizeof(options));
+ options.name = NULL;
+ if (ParseSubcommandOptions(&options, interp, OPT_TO,
+ &index, argc, argv) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if ((options.name == NULL) || (index < argc)) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " put {{colors...}...} ?-to x1 y1 x2 y2?\"",
+ (char *) NULL);
+ return TCL_ERROR;
+ }
+ if (Tcl_SplitList(interp, options.name, &dataHeight, &srcArgv)
+ != TCL_OK) {
+ return TCL_ERROR;
+ }
+ tkwin = Tk_MainWindow(interp);
+ block.pixelPtr = NULL;
+ dataWidth = 0;
+ pixelPtr = NULL;
+ for (y = 0; y < dataHeight; ++y) {
+ if (Tcl_SplitList(interp, srcArgv[y], &listArgc, &listArgv)
+ != TCL_OK) {
+ break;
+ }
+ if (y == 0) {
+ dataWidth = listArgc;
+ pixelPtr = (unsigned char *) ckalloc((unsigned)
+ dataWidth * dataHeight * 3);
+ block.pixelPtr = pixelPtr;
+ } else {
+ if (listArgc != dataWidth) {
+ Tcl_AppendResult(interp, "all elements of color list must",
+ " have the same number of elements",
+ (char *) NULL);
+ ckfree((char *) listArgv);
+ break;
+ }
+ }
+ for (x = 0; x < dataWidth; ++x) {
+ if (!XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin),
+ listArgv[x], &color)) {
+ Tcl_AppendResult(interp, "can't parse color \"",
+ listArgv[x], "\"", (char *) NULL);
+ break;
+ }
+ *pixelPtr++ = color.red >> 8;
+ *pixelPtr++ = color.green >> 8;
+ *pixelPtr++ = color.blue >> 8;
+ }
+ ckfree((char *) listArgv);
+ if (x < dataWidth)
+ break;
+ }
+ ckfree((char *) srcArgv);
+ if (y < dataHeight || dataHeight == 0 || dataWidth == 0) {
+ if (block.pixelPtr != NULL) {
+ ckfree((char *) block.pixelPtr);
+ }
+ if (y < dataHeight) {
+ return TCL_ERROR;
+ }
+ return TCL_OK;
+ }
+
+ /*
+ * Fill in default values for the -to option, then
+ * copy the block in using Tk_PhotoPutBlock.
+ */
+
+ if (((options.options & OPT_TO) == 0) || (options.toX2 < 0)) {
+ options.toX2 = options.toX + dataWidth;
+ options.toY2 = options.toY + dataHeight;
+ }
+ block.width = dataWidth;
+ block.height = dataHeight;
+ block.pitch = dataWidth * 3;
+ block.pixelSize = 3;
+ block.offset[0] = 0;
+ block.offset[1] = 1;
+ block.offset[2] = 2;
+ Tk_PhotoPutBlock((ClientData)masterPtr, &block,
+ options.toX, options.toY, options.toX2 - options.toX,
+ options.toY2 - options.toY);
+ ckfree((char *) block.pixelPtr);
+ } else if ((c == 'r') && (length >= 3)
+ && (strncmp(argv[1], "read", length) == 0)) {
+ /*
+ * photo read command - first parse the options specified.
+ */
+
+ index = 2;
+ memset((VOID *) &options, 0, sizeof(options));
+ options.name = NULL;
+ options.format = NULL;
+ if (ParseSubcommandOptions(&options, interp,
+ OPT_FORMAT | OPT_FROM | OPT_TO | OPT_SHRINK,
+ &index, argc, argv) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if ((options.name == NULL) || (index < argc)) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " read fileName ?-format format-name?",
+ " ?-from x1 y1 x2 y2? ?-to x y? ?-shrink?\"",
+ (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Prevent file system access in safe interpreters.
+ */
+
+ if (Tcl_IsSafe(interp)) {
+ Tcl_AppendResult(interp, "can't get image from a file in a",
+ " safe interpreter", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Open the image file and look for a handler for it.
+ */
+
+ chan = Tcl_OpenFileChannel(interp, options.name, "r", 0);
+ if (chan == NULL) {
+ return TCL_ERROR;
+ }
+ if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
+ != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if (MatchFileFormat(interp, chan, options.name, options.format,
+ &imageFormat, &imageWidth, &imageHeight) != TCL_OK) {
+ Tcl_Close(NULL, chan);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Check the values given for the -from option.
+ */
+
+ if ((options.fromX > imageWidth) || (options.fromY > imageHeight)
+ || (options.fromX2 > imageWidth)
+ || (options.fromY2 > imageHeight)) {
+ Tcl_AppendResult(interp, "coordinates for -from option extend ",
+ "outside source image", (char *) NULL);
+ Tcl_Close(NULL, chan);
+ return TCL_ERROR;
+ }
+ if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
+ width = imageWidth - options.fromX;
+ height = imageHeight - options.fromY;
+ } else {
+ width = options.fromX2 - options.fromX;
+ height = options.fromY2 - options.fromY;
+ }
+
+ /*
+ * If the -shrink option was specified, set the size of the image.
+ */
+
+ if (options.options & OPT_SHRINK) {
+ ImgPhotoSetSize(masterPtr, options.toX + width,
+ options.toY + height);
+ }
+
+ /*
+ * Call the handler's file read procedure to read the data
+ * into the image.
+ */
+
+ result = (*imageFormat->fileReadProc)(interp, chan, options.name,
+ options.format, (Tk_PhotoHandle) masterPtr, options.toX,
+ options.toY, width, height, options.fromX, options.fromY);
+ if (chan != NULL) {
+ Tcl_Close(NULL, chan);
+ }
+ return result;
+ } else if ((c == 'r') && (length >= 3)
+ && (strncmp(argv[1], "redither", length) == 0)) {
+
+ if (argc == 2) {
+ /*
+ * Call Dither if any part of the image is not correctly
+ * dithered at present.
+ */
+
+ x = masterPtr->ditherX;
+ y = masterPtr->ditherY;
+ if (masterPtr->ditherX != 0) {
+ Dither(masterPtr, x, y, masterPtr->width - x, 1);
+ }
+ if (masterPtr->ditherY < masterPtr->height) {
+ x = 0;
+ Dither(masterPtr, 0, masterPtr->ditherY, masterPtr->width,
+ masterPtr->height - masterPtr->ditherY);
+ }
+
+ if (y < masterPtr->height) {
+ /*
+ * Tell the core image code that part of the image has changed.
+ */
+
+ Tk_ImageChanged(masterPtr->tkMaster, x, y,
+ (masterPtr->width - x), (masterPtr->height - y),
+ masterPtr->width, masterPtr->height);
+ }
+
+ } else {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " redither\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ } else if ((c == 'w') && (strncmp(argv[1], "write", length) == 0)) {
+
+ /*
+ * Prevent file system access in safe interpreters.
+ */
+
+ if (Tcl_IsSafe(interp)) {
+ Tcl_AppendResult(interp, "can't write image to a file in a",
+ " safe interpreter", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * photo write command - first parse and check any options given.
+ */
+
+ index = 2;
+ memset((VOID *) &options, 0, sizeof(options));
+ options.name = NULL;
+ options.format = NULL;
+ if (ParseSubcommandOptions(&options, interp, OPT_FORMAT | OPT_FROM,
+ &index, argc, argv) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if ((options.name == NULL) || (index < argc)) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
+ " write fileName ?-format format-name?",
+ "?-from x1 y1 x2 y2?\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ if ((options.fromX > masterPtr->width)
+ || (options.fromY > masterPtr->height)
+ || (options.fromX2 > masterPtr->width)
+ || (options.fromY2 > masterPtr->height)) {
+ Tcl_AppendResult(interp, "coordinates for -from option extend ",
+ "outside image", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ /*
+ * Fill in default values for unspecified parameters.
+ */
+
+ if (((options.options & OPT_FROM) == 0) || (options.fromX2 < 0)) {
+ options.fromX2 = masterPtr->width;
+ options.fromY2 = masterPtr->height;
+ }
+
+ /*
+ * Search for an appropriate image file format handler,
+ * and give an error if none is found.
+ */
+
+ matched = 0;
+ for (imageFormat = formatList; imageFormat != NULL;
+ imageFormat = imageFormat->nextPtr) {
+ if ((options.format == NULL)
+ || (strncasecmp(options.format, imageFormat->name,
+ strlen(imageFormat->name)) == 0)) {
+ matched = 1;
+ if (imageFormat->fileWriteProc != NULL) {
+ break;
+ }
+ }
+ }
+ if (imageFormat == NULL) {
+ if (options.format == NULL) {
+ Tcl_AppendResult(interp, "no available image file format ",
+ "has file writing capability", (char *) NULL);
+ } else if (!matched) {
+ Tcl_AppendResult(interp, "image file format \"",
+ options.format, "\" is unknown", (char *) NULL);
+ } else {
+ Tcl_AppendResult(interp, "image file format \"",
+ options.format, "\" has no file writing capability",
+ (char *) NULL);
+ }
+ return TCL_ERROR;
+ }
+
+ /*
+ * Call the handler's file write procedure to write out
+ * the image.
+ */
+
+ Tk_PhotoGetImage((Tk_PhotoHandle) masterPtr, &block);
+ block.pixelPtr += options.fromY * block.pitch + options.fromX * 3;
+ block.width = options.fromX2 - options.fromX;
+ block.height = options.fromY2 - options.fromY;
+ return (*imageFormat->fileWriteProc)(interp, options.name,
+ options.format, &block);
+ } else {
+ Tcl_AppendResult(interp, "bad option \"", argv[1],
+ "\": must be blank, cget, configure, copy, get, put,",
+ " read, redither, or write", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ParseSubcommandOptions --
+ *
+ * This procedure is invoked to process one of the options
+ * which may be specified for the photo image subcommands,
+ * namely, -from, -to, -zoom, -subsample, -format, and -shrink.
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * Fields in *optPtr get filled in.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ParseSubcommandOptions(optPtr, interp, allowedOptions, optIndexPtr, argc, argv)
+ struct SubcommandOptions *optPtr;
+ /* Information about the options specified
+ * and the values given is returned here. */
+ Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
+ int allowedOptions; /* Indicates which options are valid for
+ * the current command. */
+ int *optIndexPtr; /* Points to a variable containing the
+ * current index in argv; this variable is
+ * updated by this procedure. */
+ int argc; /* Number of arguments in argv[]. */
+ char **argv; /* Arguments to be parsed. */
+{
+ int index, c, bit, currentBit;
+ size_t length;
+ char *option, **listPtr;
+ int values[4];
+ int numValues, maxValues, argIndex;
+
+ for (index = *optIndexPtr; index < argc; *optIndexPtr = ++index) {
+ /*
+ * We can have one value specified without an option;
+ * it goes into optPtr->name.
+ */
+
+ option = argv[index];
+ if (option[0] != '-') {
+ if (optPtr->name == NULL) {
+ optPtr->name = option;
+ continue;
+ }
+ break;
+ }
+
+ /*
+ * Work out which option this is.
+ */
+
+ length = strlen(option);
+ c = option[0];
+ bit = 0;
+ currentBit = 1;
+ for (listPtr = optionNames; *listPtr != NULL; ++listPtr) {
+ if ((c == *listPtr[0])
+ && (strncmp(option, *listPtr, length) == 0)) {
+ if (bit != 0) {
+ bit = 0; /* An ambiguous option. */
+ break;
+ }
+ bit = currentBit;
+ }
+ currentBit <<= 1;
+ }
+
+ /*
+ * If this option is not recognized and allowed, put
+ * an error message in the interpreter and return.
+ */
+
+ if ((allowedOptions & bit) == 0) {
+ Tcl_AppendResult(interp, "unrecognized option \"", argv[index],
+ "\": must be ", (char *)NULL);
+ bit = 1;
+ for (listPtr = optionNames; *listPtr != NULL; ++listPtr) {
+ if ((allowedOptions & bit) != 0) {
+ if ((allowedOptions & (bit - 1)) != 0) {
+ Tcl_AppendResult(interp, ", ", (char *) NULL);
+ if ((allowedOptions & ~((bit << 1) - 1)) == 0) {
+ Tcl_AppendResult(interp, "or ", (char *) NULL);
+ }
+ }
+ Tcl_AppendResult(interp, *listPtr, (char *) NULL);
+ }
+ bit <<= 1;
+ }
+ return TCL_ERROR;
+ }
+
+ /*
+ * For the -from, -to, -zoom and -subsample options,
+ * parse the values given. Report an error if too few
+ * or too many values are given.
+ */
+
+ if ((bit != OPT_SHRINK) && (bit != OPT_FORMAT)) {
+ maxValues = ((bit == OPT_FROM) || (bit == OPT_TO))? 4: 2;
+ argIndex = index + 1;
+ for (numValues = 0; numValues < maxValues; ++numValues) {
+ if ((argIndex < argc) && (isdigit(UCHAR(argv[argIndex][0]))
+ || ((argv[argIndex][0] == '-')
+ && (isdigit(UCHAR(argv[argIndex][1])))))) {
+ if (Tcl_GetInt(interp, argv[argIndex], &values[numValues])
+ != TCL_OK) {
+ return TCL_ERROR;
+ }
+ } else {
+ break;
+ }
+ ++argIndex;
+ }
+
+ if (numValues == 0) {
+ Tcl_AppendResult(interp, "the \"", argv[index], "\" option ",
+ "requires one ", maxValues == 2? "or two": "to four",
+ " integer values", (char *) NULL);
+ return TCL_ERROR;
+ }
+ *optIndexPtr = (index += numValues);
+
+ /*
+ * Y values default to the corresponding X value if not specified.
+ */
+
+ if (numValues == 1) {
+ values[1] = values[0];
+ }
+ if (numValues == 3) {
+ values[3] = values[2];
+ }
+
+ /*
+ * Check the values given and put them in the appropriate
+ * field of the SubcommandOptions structure.
+ */
+
+ switch (bit) {
+ case OPT_FROM:
+ if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2)
+ && ((values[2] < 0) || (values[3] < 0)))) {
+ Tcl_AppendResult(interp, "value(s) for the -from",
+ " option must be non-negative", (char *) NULL);
+ return TCL_ERROR;
+ }
+ if (numValues <= 2) {
+ optPtr->fromX = values[0];
+ optPtr->fromY = values[1];
+ optPtr->fromX2 = -1;
+ optPtr->fromY2 = -1;
+ } else {
+ optPtr->fromX = MIN(values[0], values[2]);
+ optPtr->fromY = MIN(values[1], values[3]);
+ optPtr->fromX2 = MAX(values[0], values[2]);
+ optPtr->fromY2 = MAX(values[1], values[3]);
+ }
+ break;
+ case OPT_SUBSAMPLE:
+ optPtr->subsampleX = values[0];
+ optPtr->subsampleY = values[1];
+ break;
+ case OPT_TO:
+ if ((values[0] < 0) || (values[1] < 0) || ((numValues > 2)
+ && ((values[2] < 0) || (values[3] < 0)))) {
+ Tcl_AppendResult(interp, "value(s) for the -to",
+ " option must be non-negative", (char *) NULL);
+ return TCL_ERROR;
+ }
+ if (numValues <= 2) {
+ optPtr->toX = values[0];
+ optPtr->toY = values[1];
+ optPtr->toX2 = -1;
+ optPtr->toY2 = -1;
+ } else {
+ optPtr->toX = MIN(values[0], values[2]);
+ optPtr->toY = MIN(values[1], values[3]);
+ optPtr->toX2 = MAX(values[0], values[2]);
+ optPtr->toY2 = MAX(values[1], values[3]);
+ }
+ break;
+ case OPT_ZOOM:
+ if ((values[0] <= 0) || (values[1] <= 0)) {
+ Tcl_AppendResult(interp, "value(s) for the -zoom",
+ " option must be positive", (char *) NULL);
+ return TCL_ERROR;
+ }
+ optPtr->zoomX = values[0];
+ optPtr->zoomY = values[1];
+ break;
+ }
+ } else if (bit == OPT_FORMAT) {
+ /*
+ * The -format option takes a single string value.
+ */
+
+ if (index + 1 < argc) {
+ *optIndexPtr = ++index;
+ optPtr->format = argv[index];
+ } else {
+ Tcl_AppendResult(interp, "the \"-format\" option ",
+ "requires a value", (char *) NULL);
+ return TCL_ERROR;
+ }
+ }
+
+ /*
+ * Remember that we saw this option.
+ */
+
+ optPtr->options |= bit;
+ }
+
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoConfigureMaster --
+ *
+ * This procedure is called when a photo image is created or
+ * reconfigured. It processes configuration options and resets
+ * any instances of the image.
+ *
+ * Results:
+ * A standard Tcl return value. If TCL_ERROR is returned then
+ * an error message is left in masterPtr->interp->result.
+ *
+ * Side effects:
+ * Existing instances of the image will be redisplayed to match
+ * the new configuration options.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ImgPhotoConfigureMaster(interp, masterPtr, argc, argv, flags)
+ Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
+ PhotoMaster *masterPtr; /* Pointer to data structure describing
+ * overall photo image to (re)configure. */
+ int argc; /* Number of entries in argv. */
+ char **argv; /* Pairs of configuration options for image. */
+ int flags; /* Flags to pass to Tk_ConfigureWidget,
+ * such as TK_CONFIG_ARGV_ONLY. */
+{
+ PhotoInstance *instancePtr;
+ char *oldFileString, *oldDataString, *oldPaletteString;
+ double oldGamma;
+ int result;
+ Tcl_Channel chan;
+ Tk_PhotoImageFormat *imageFormat;
+ int imageWidth, imageHeight;
+
+ /*
+ * Save the current values for fileString and dataString, so we
+ * can tell if the user specifies them anew.
+ */
+
+ oldFileString = masterPtr->fileString;
+ oldDataString = (oldFileString == NULL)? masterPtr->dataString: NULL;
+ oldPaletteString = masterPtr->palette;
+ oldGamma = masterPtr->gamma;
+
+ /*
+ * Process the configuration options specified.
+ */
+
+ if (Tk_ConfigureWidget(interp, Tk_MainWindow(interp), configSpecs,
+ argc, argv, (char *) masterPtr, flags) != TCL_OK) {
+ return TCL_ERROR;
+ }
+
+ /*
+ * Regard the empty string for -file, -data or -format as the null
+ * value.
+ */
+
+ if ((masterPtr->fileString != NULL) && (masterPtr->fileString[0] == 0)) {
+ ckfree(masterPtr->fileString);
+ masterPtr->fileString = NULL;
+ }
+ if ((masterPtr->dataString != NULL) && (masterPtr->dataString[0] == 0)) {
+ ckfree(masterPtr->dataString);
+ masterPtr->dataString = NULL;
+ }
+ if ((masterPtr->format != NULL) && (masterPtr->format[0] == 0)) {
+ ckfree(masterPtr->format);
+ masterPtr->format = NULL;
+ }
+
+ /*
+ * Set the image to the user-requested size, if any,
+ * and make sure storage is correctly allocated for this image.
+ */
+
+ ImgPhotoSetSize(masterPtr, masterPtr->width, masterPtr->height);
+
+ /*
+ * Read in the image from the file or string if the user has
+ * specified the -file or -data option.
+ */
+
+ if ((masterPtr->fileString != NULL)
+ && (masterPtr->fileString != oldFileString)) {
+
+ /*
+ * Prevent file system access in a safe interpreter.
+ */
+
+ if (Tcl_IsSafe(interp)) {
+ Tcl_AppendResult(interp, "can't get image from a file in a",
+ " safe interpreter", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ chan = Tcl_OpenFileChannel(interp, masterPtr->fileString, "r", 0);
+ if (chan == NULL) {
+ return TCL_ERROR;
+ }
+ if (Tcl_SetChannelOption(interp, chan, "-translation", "binary")
+ != TCL_OK) {
+ return TCL_ERROR;
+ }
+ if (MatchFileFormat(interp, chan, masterPtr->fileString,
+ masterPtr->format, &imageFormat, &imageWidth,
+ &imageHeight) != TCL_OK) {
+ Tcl_Close(NULL, chan);
+ return TCL_ERROR;
+ }
+ ImgPhotoSetSize(masterPtr, imageWidth, imageHeight);
+ result = (*imageFormat->fileReadProc)(interp, chan,
+ masterPtr->fileString, masterPtr->format,
+ (Tk_PhotoHandle) masterPtr, 0, 0,
+ imageWidth, imageHeight, 0, 0);
+ Tcl_Close(NULL, chan);
+ if (result != TCL_OK) {
+ return TCL_ERROR;
+ }
+
+ masterPtr->flags |= IMAGE_CHANGED;
+ }
+
+ if ((masterPtr->fileString == NULL) && (masterPtr->dataString != NULL)
+ && (masterPtr->dataString != oldDataString)) {
+
+ if (MatchStringFormat(interp, masterPtr->dataString,
+ masterPtr->format, &imageFormat, &imageWidth,
+ &imageHeight) != TCL_OK) {
+ return TCL_ERROR;
+ }
+ ImgPhotoSetSize(masterPtr, imageWidth, imageHeight);
+ if ((*imageFormat->stringReadProc)(interp, masterPtr->dataString,
+ masterPtr->format, (Tk_PhotoHandle) masterPtr,
+ 0, 0, imageWidth, imageHeight, 0, 0) != TCL_OK) {
+ return TCL_ERROR;
+ }
+
+ masterPtr->flags |= IMAGE_CHANGED;
+ }
+
+ /*
+ * Enforce a reasonable value for gamma.
+ */
+
+ if (masterPtr->gamma <= 0) {
+ masterPtr->gamma = 1.0;
+ }
+
+ if ((masterPtr->gamma != oldGamma)
+ || (masterPtr->palette != oldPaletteString)) {
+ masterPtr->flags |= IMAGE_CHANGED;
+ }
+
+ /*
+ * Cycle through all of the instances of this image, regenerating
+ * the information for each instance. Then force the image to be
+ * redisplayed everywhere that it is used.
+ */
+
+ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
+ instancePtr = instancePtr->nextPtr) {
+ ImgPhotoConfigureInstance(instancePtr);
+ }
+
+ /*
+ * Inform the generic image code that the image
+ * has (potentially) changed.
+ */
+
+ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width,
+ masterPtr->height, masterPtr->width, masterPtr->height);
+ masterPtr->flags &= ~IMAGE_CHANGED;
+
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoConfigureInstance --
+ *
+ * This procedure is called to create displaying information for
+ * a photo image instance based on the configuration information
+ * in the master. It is invoked both when new instances are
+ * created and when the master is reconfigured.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Generates errors via Tcl_BackgroundError if there are problems
+ * in setting up the instance.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoConfigureInstance(instancePtr)
+ PhotoInstance *instancePtr; /* Instance to reconfigure. */
+{
+ PhotoMaster *masterPtr = instancePtr->masterPtr;
+ XImage *imagePtr;
+ int bitsPerPixel;
+ ColorTable *colorTablePtr;
+ XRectangle validBox;
+
+ /*
+ * If the -palette configuration option has been set for the master,
+ * use the value specified for our palette, but only if it is
+ * a valid palette for our windows. Use the gamma value specified
+ * the master.
+ */
+
+ if ((masterPtr->palette && masterPtr->palette[0])
+ && IsValidPalette(instancePtr, masterPtr->palette)) {
+ instancePtr->palette = masterPtr->palette;
+ } else {
+ instancePtr->palette = instancePtr->defaultPalette;
+ }
+ instancePtr->gamma = masterPtr->gamma;
+
+ /*
+ * If we don't currently have a color table, or if the one we
+ * have no longer applies (e.g. because our palette or gamma
+ * has changed), get a new one.
+ */
+
+ colorTablePtr = instancePtr->colorTablePtr;
+ if ((colorTablePtr == NULL)
+ || (instancePtr->colormap != colorTablePtr->id.colormap)
+ || (instancePtr->palette != colorTablePtr->id.palette)
+ || (instancePtr->gamma != colorTablePtr->id.gamma)) {
+ /*
+ * Free up our old color table, and get a new one.
+ */
+
+ if (colorTablePtr != NULL) {
+ colorTablePtr->liveRefCount -= 1;
+ FreeColorTable(colorTablePtr);
+ }
+ GetColorTable(instancePtr);
+
+ /*
+ * Create a new XImage structure for sending data to
+ * the X server, if necessary.
+ */
+
+ if (instancePtr->colorTablePtr->flags & BLACK_AND_WHITE) {
+ bitsPerPixel = 1;
+ } else {
+ bitsPerPixel = instancePtr->visualInfo.depth;
+ }
+
+ if ((instancePtr->imagePtr == NULL)
+ || (instancePtr->imagePtr->bits_per_pixel != bitsPerPixel)) {
+ if (instancePtr->imagePtr != NULL) {
+ XFree((char *) instancePtr->imagePtr);
+ }
+ imagePtr = XCreateImage(instancePtr->display,
+ instancePtr->visualInfo.visual, (unsigned) bitsPerPixel,
+ (bitsPerPixel > 1? ZPixmap: XYBitmap), 0, (char *) NULL,
+ 1, 1, 32, 0);
+ instancePtr->imagePtr = imagePtr;
+
+ /*
+ * Determine the endianness of this machine.
+ * We create images using the local host's endianness, rather
+ * than the endianness of the server; otherwise we would have
+ * to byte-swap any 16 or 32 bit values that we store in the
+ * image in those situations where the server's endianness
+ * is different from ours.
+ */
+
+ if (imagePtr != NULL) {
+ union {
+ int i;
+ char c[sizeof(int)];
+ } kludge;
+
+ imagePtr->bitmap_unit = sizeof(pixel) * NBBY;
+ kludge.i = 0;
+ kludge.c[0] = 1;
+ imagePtr->byte_order = (kludge.i == 1) ? LSBFirst : MSBFirst;
+ _XInitImageFuncPtrs(imagePtr);
+ }
+ }
+ }
+
+ /*
+ * If the user has specified a width and/or height for the master
+ * which is different from our current width/height, set the size
+ * to the values specified by the user. If we have no pixmap, we
+ * do this also, since it has the side effect of allocating a
+ * pixmap for us.
+ */
+
+ if ((instancePtr->pixels == None) || (instancePtr->error == NULL)
+ || (instancePtr->width != masterPtr->width)
+ || (instancePtr->height != masterPtr->height)) {
+ ImgPhotoInstanceSetSize(instancePtr);
+ }
+
+ /*
+ * Redither this instance if necessary.
+ */
+
+ if ((masterPtr->flags & IMAGE_CHANGED)
+ || (instancePtr->colorTablePtr != colorTablePtr)) {
+ TkClipBox(masterPtr->validRegion, &validBox);
+ if ((validBox.width > 0) && (validBox.height > 0)) {
+ DitherInstance(instancePtr, validBox.x, validBox.y,
+ validBox.width, validBox.height);
+ }
+ }
+
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoGet --
+ *
+ * This procedure is called for each use of a photo image in a
+ * widget.
+ *
+ * Results:
+ * The return value is a token for the instance, which is passed
+ * back to us in calls to ImgPhotoDisplay and ImgPhotoFree.
+ *
+ * Side effects:
+ * A data structure is set up for the instance (or, an existing
+ * instance is re-used for the new one).
+ *
+ *----------------------------------------------------------------------
+ */
+
+static ClientData
+ImgPhotoGet(tkwin, masterData)
+ Tk_Window tkwin; /* Window in which the instance will be
+ * used. */
+ ClientData masterData; /* Pointer to our master structure for the
+ * image. */
+{
+ PhotoMaster *masterPtr = (PhotoMaster *) masterData;
+ PhotoInstance *instancePtr;
+ Colormap colormap;
+ int mono, nRed, nGreen, nBlue;
+ XVisualInfo visualInfo, *visInfoPtr;
+ XRectangle validBox;
+ char buf[16];
+ int numVisuals;
+ XColor *white, *black;
+ XGCValues gcValues;
+
+ /*
+ * Table of "best" choices for palette for PseudoColor displays
+ * with between 3 and 15 bits/pixel.
+ */
+
+ static int paletteChoice[13][3] = {
+ /* #red, #green, #blue */
+ {2, 2, 2, /* 3 bits, 8 colors */},
+ {2, 3, 2, /* 4 bits, 12 colors */},
+ {3, 4, 2, /* 5 bits, 24 colors */},
+ {4, 5, 3, /* 6 bits, 60 colors */},
+ {5, 6, 4, /* 7 bits, 120 colors */},
+ {7, 7, 4, /* 8 bits, 198 colors */},
+ {8, 10, 6, /* 9 bits, 480 colors */},
+ {10, 12, 8, /* 10 bits, 960 colors */},
+ {14, 15, 9, /* 11 bits, 1890 colors */},
+ {16, 20, 12, /* 12 bits, 3840 colors */},
+ {20, 24, 16, /* 13 bits, 7680 colors */},
+ {26, 30, 20, /* 14 bits, 15600 colors */},
+ {32, 32, 30, /* 15 bits, 30720 colors */}
+ };
+
+ /*
+ * See if there is already an instance for windows using
+ * the same colormap. If so then just re-use it.
+ */
+
+ colormap = Tk_Colormap(tkwin);
+ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
+ instancePtr = instancePtr->nextPtr) {
+ if ((colormap == instancePtr->colormap)
+ && (Tk_Display(tkwin) == instancePtr->display)) {
+
+ /*
+ * Re-use this instance.
+ */
+
+ if (instancePtr->refCount == 0) {
+ /*
+ * We are resurrecting this instance.
+ */
+
+ Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr);
+ if (instancePtr->colorTablePtr != NULL) {
+ FreeColorTable(instancePtr->colorTablePtr);
+ }
+ GetColorTable(instancePtr);
+ }
+ instancePtr->refCount++;
+ return (ClientData) instancePtr;
+ }
+ }
+
+ /*
+ * The image isn't already in use in a window with the same colormap.
+ * Make a new instance of the image.
+ */
+
+ instancePtr = (PhotoInstance *) ckalloc(sizeof(PhotoInstance));
+ instancePtr->masterPtr = masterPtr;
+ instancePtr->display = Tk_Display(tkwin);
+ instancePtr->colormap = Tk_Colormap(tkwin);
+ Tk_PreserveColormap(instancePtr->display, instancePtr->colormap);
+ instancePtr->refCount = 1;
+ instancePtr->colorTablePtr = NULL;
+ instancePtr->pixels = None;
+ instancePtr->error = NULL;
+ instancePtr->width = 0;
+ instancePtr->height = 0;
+ instancePtr->imagePtr = 0;
+ instancePtr->nextPtr = masterPtr->instancePtr;
+ masterPtr->instancePtr = instancePtr;
+
+ /*
+ * Obtain information about the visual and decide on the
+ * default palette.
+ */
+
+ visualInfo.screen = Tk_ScreenNumber(tkwin);
+ visualInfo.visualid = XVisualIDFromVisual(Tk_Visual(tkwin));
+ visInfoPtr = XGetVisualInfo(Tk_Display(tkwin),
+ VisualScreenMask | VisualIDMask, &visualInfo, &numVisuals);
+ nRed = 2;
+ nGreen = nBlue = 0;
+ mono = 1;
+ if (visInfoPtr != NULL) {
+ instancePtr->visualInfo = *visInfoPtr;
+ switch (visInfoPtr->class) {
+ case DirectColor:
+ case TrueColor:
+ nRed = 1 << CountBits(visInfoPtr->red_mask);
+ nGreen = 1 << CountBits(visInfoPtr->green_mask);
+ nBlue = 1 << CountBits(visInfoPtr->blue_mask);
+ mono = 0;
+ break;
+ case PseudoColor:
+ case StaticColor:
+ if (visInfoPtr->depth > 15) {
+ nRed = 32;
+ nGreen = 32;
+ nBlue = 32;
+ mono = 0;
+ } else if (visInfoPtr->depth >= 3) {
+ int *ip = paletteChoice[visInfoPtr->depth - 3];
+
+ nRed = ip[0];
+ nGreen = ip[1];
+ nBlue = ip[2];
+ mono = 0;
+ }
+ break;
+ case GrayScale:
+ case StaticGray:
+ nRed = 1 << visInfoPtr->depth;
+ break;
+ }
+ XFree((char *) visInfoPtr);
+
+ } else {
+ panic("ImgPhotoGet couldn't find visual for window");
+ }
+
+ sprintf(buf, ((mono) ? "%d": "%d/%d/%d"), nRed, nGreen, nBlue);
+ instancePtr->defaultPalette = Tk_GetUid(buf);
+
+ /*
+ * Make a GC with background = black and foreground = white.
+ */
+
+ white = Tk_GetColor(masterPtr->interp, tkwin, "white");
+ black = Tk_GetColor(masterPtr->interp, tkwin, "black");
+ gcValues.foreground = (white != NULL)? white->pixel:
+ WhitePixelOfScreen(Tk_Screen(tkwin));
+ gcValues.background = (black != NULL)? black->pixel:
+ BlackPixelOfScreen(Tk_Screen(tkwin));
+ gcValues.graphics_exposures = False;
+ instancePtr->gc = Tk_GetGC(tkwin,
+ GCForeground|GCBackground|GCGraphicsExposures, &gcValues);
+
+ /*
+ * Set configuration options and finish the initialization of the instance.
+ */
+
+ ImgPhotoConfigureInstance(instancePtr);
+
+ /*
+ * If this is the first instance, must set the size of the image.
+ */
+
+ if (instancePtr->nextPtr == NULL) {
+ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0,
+ masterPtr->width, masterPtr->height);
+ }
+
+ /*
+ * Dither the image to fill in this instance's pixmap.
+ */
+
+ TkClipBox(masterPtr->validRegion, &validBox);
+ if ((validBox.width > 0) && (validBox.height > 0)) {
+ DitherInstance(instancePtr, validBox.x, validBox.y, validBox.width,
+ validBox.height);
+ }
+
+ return (ClientData) instancePtr;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoDisplay --
+ *
+ * This procedure is invoked to draw a photo image.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * A portion of the image gets rendered in a pixmap or window.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoDisplay(clientData, display, drawable, imageX, imageY, width,
+ height, drawableX, drawableY)
+ ClientData clientData; /* Pointer to PhotoInstance structure for
+ * for instance to be displayed. */
+ Display *display; /* Display on which to draw image. */
+ Drawable drawable; /* Pixmap or window in which to draw image. */
+ int imageX, imageY; /* Upper-left corner of region within image
+ * to draw. */
+ int width, height; /* Dimensions of region within image to draw. */
+ int drawableX, drawableY; /* Coordinates within drawable that
+ * correspond to imageX and imageY. */
+{
+ PhotoInstance *instancePtr = (PhotoInstance *) clientData;
+
+ /*
+ * If there's no pixmap, it means that an error occurred
+ * while creating the image instance so it can't be displayed.
+ */
+
+ if (instancePtr->pixels == None) {
+ return;
+ }
+
+ /*
+ * masterPtr->region describes which parts of the image contain
+ * valid data. We set this region as the clip mask for the gc,
+ * setting its origin appropriately, and use it when drawing the
+ * image.
+ */
+
+ TkSetRegion(display, instancePtr->gc, instancePtr->masterPtr->validRegion);
+ XSetClipOrigin(display, instancePtr->gc, drawableX - imageX,
+ drawableY - imageY);
+ XCopyArea(display, instancePtr->pixels, drawable, instancePtr->gc,
+ imageX, imageY, (unsigned) width, (unsigned) height,
+ drawableX, drawableY);
+ XSetClipMask(display, instancePtr->gc, None);
+ XSetClipOrigin(display, instancePtr->gc, 0, 0);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoFree --
+ *
+ * This procedure is called when a widget ceases to use a
+ * particular instance of an image. We don't actually get
+ * rid of the instance until later because we may be about
+ * to get this instance again.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Internal data structures get cleaned up, later.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoFree(clientData, display)
+ ClientData clientData; /* Pointer to PhotoInstance structure for
+ * for instance to be displayed. */
+ Display *display; /* Display containing window that used image. */
+{
+ PhotoInstance *instancePtr = (PhotoInstance *) clientData;
+ ColorTable *colorPtr;
+
+ instancePtr->refCount -= 1;
+ if (instancePtr->refCount > 0) {
+ return;
+ }
+
+ /*
+ * There are no more uses of the image within this widget.
+ * Decrement the count of live uses of its color table, so
+ * that its colors can be reclaimed if necessary, and
+ * set up an idle call to free the instance structure.
+ */
+
+ colorPtr = instancePtr->colorTablePtr;
+ if (colorPtr != NULL) {
+ colorPtr->liveRefCount -= 1;
+ }
+
+ Tcl_DoWhenIdle(DisposeInstance, (ClientData) instancePtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoDelete --
+ *
+ * This procedure is called by the image code to delete the
+ * master structure for an image.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Resources associated with the image get freed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoDelete(masterData)
+ ClientData masterData; /* Pointer to PhotoMaster structure for
+ * image. Must not have any more instances. */
+{
+ PhotoMaster *masterPtr = (PhotoMaster *) masterData;
+ PhotoInstance *instancePtr;
+
+ while ((instancePtr = masterPtr->instancePtr) != NULL) {
+ if (instancePtr->refCount > 0) {
+ panic("tried to delete photo image when instances still exist");
+ }
+ Tcl_CancelIdleCall(DisposeInstance, (ClientData) instancePtr);
+ DisposeInstance((ClientData) instancePtr);
+ }
+ masterPtr->tkMaster = NULL;
+ if (masterPtr->imageCmd != NULL) {
+ Tcl_DeleteCommandFromToken(masterPtr->interp, masterPtr->imageCmd);
+ }
+ if (masterPtr->pix24 != NULL) {
+ ckfree((char *) masterPtr->pix24);
+ }
+ if (masterPtr->validRegion != NULL) {
+ TkDestroyRegion(masterPtr->validRegion);
+ }
+ Tk_FreeOptions(configSpecs, (char *) masterPtr, (Display *) NULL, 0);
+ ckfree((char *) masterPtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoCmdDeletedProc --
+ *
+ * This procedure is invoked when the image command for an image
+ * is deleted. It deletes the image.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The image is deleted.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoCmdDeletedProc(clientData)
+ ClientData clientData; /* Pointer to PhotoMaster structure for
+ * image. */
+{
+ PhotoMaster *masterPtr = (PhotoMaster *) clientData;
+
+ masterPtr->imageCmd = NULL;
+ if (masterPtr->tkMaster != NULL) {
+ Tk_DeleteImage(masterPtr->interp, Tk_NameOfImage(masterPtr->tkMaster));
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoSetSize --
+ *
+ * This procedure reallocates the image storage and instance
+ * pixmaps for a photo image, as necessary, to change the
+ * image's size to `width' x `height' pixels.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Storage gets reallocated, for the master and all its instances.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoSetSize(masterPtr, width, height)
+ PhotoMaster *masterPtr;
+ int width, height;
+{
+ unsigned char *newPix24;
+ int h, offset, pitch;
+ unsigned char *srcPtr, *destPtr;
+ XRectangle validBox, clipBox;
+ TkRegion clipRegion;
+ PhotoInstance *instancePtr;
+
+ if (masterPtr->userWidth > 0) {
+ width = masterPtr->userWidth;
+ }
+ if (masterPtr->userHeight > 0) {
+ height = masterPtr->userHeight;
+ }
+
+ /*
+ * We have to trim the valid region if it is currently
+ * larger than the new image size.
+ */
+
+ TkClipBox(masterPtr->validRegion, &validBox);
+ if ((validBox.x + validBox.width > width)
+ || (validBox.y + validBox.height > height)) {
+ clipBox.x = 0;
+ clipBox.y = 0;
+ clipBox.width = width;
+ clipBox.height = height;
+ clipRegion = TkCreateRegion();
+ TkUnionRectWithRegion(&clipBox, clipRegion, clipRegion);
+ TkIntersectRegion(masterPtr->validRegion, clipRegion,
+ masterPtr->validRegion);
+ TkDestroyRegion(clipRegion);
+ TkClipBox(masterPtr->validRegion, &validBox);
+ }
+
+ if ((width != masterPtr->width) || (height != masterPtr->height)
+ || (masterPtr->pix24 == NULL)) {
+
+ /*
+ * Reallocate storage for the 24-bit image and copy
+ * over valid regions.
+ */
+
+ pitch = width * 3;
+ newPix24 = (unsigned char *) ckalloc((unsigned) (height * pitch));
+
+ /*
+ * Zero the new array. The dithering code shouldn't read the
+ * areas outside validBox, but they might be copied to another
+ * photo image or written to a file.
+ */
+
+ if ((masterPtr->pix24 != NULL)
+ && ((width == masterPtr->width) || (width == validBox.width))) {
+ if (validBox.y > 0) {
+ memset((VOID *) newPix24, 0, (size_t) (validBox.y * pitch));
+ }
+ h = validBox.y + validBox.height;
+ if (h < height) {
+ memset((VOID *) (newPix24 + h * pitch), 0,
+ (size_t) ((height - h) * pitch));
+ }
+ } else {
+ memset((VOID *) newPix24, 0, (size_t) (height * pitch));
+ }
+
+ if (masterPtr->pix24 != NULL) {
+
+ /*
+ * Copy the common area over to the new array array and
+ * free the old array.
+ */
+
+ if (width == masterPtr->width) {
+
+ /*
+ * The region to be copied is contiguous.
+ */
+
+ offset = validBox.y * pitch;
+ memcpy((VOID *) (newPix24 + offset),
+ (VOID *) (masterPtr->pix24 + offset),
+ (size_t) (validBox.height * pitch));
+
+ } else if ((validBox.width > 0) && (validBox.height > 0)) {
+
+ /*
+ * Area to be copied is not contiguous - copy line by line.
+ */
+
+ destPtr = newPix24 + (validBox.y * width + validBox.x) * 3;
+ srcPtr = masterPtr->pix24 + (validBox.y * masterPtr->width
+ + validBox.x) * 3;
+ for (h = validBox.height; h > 0; h--) {
+ memcpy((VOID *) destPtr, (VOID *) srcPtr,
+ (size_t) (validBox.width * 3));
+ destPtr += width * 3;
+ srcPtr += masterPtr->width * 3;
+ }
+ }
+
+ ckfree((char *) masterPtr->pix24);
+ }
+
+ masterPtr->pix24 = newPix24;
+ masterPtr->width = width;
+ masterPtr->height = height;
+
+ /*
+ * Dithering will be correct up to the end of the last
+ * pre-existing complete scanline.
+ */
+
+ if ((validBox.x > 0) || (validBox.y > 0)) {
+ masterPtr->ditherX = 0;
+ masterPtr->ditherY = 0;
+ } else if (validBox.width == width) {
+ if ((int) validBox.height < masterPtr->ditherY) {
+ masterPtr->ditherX = 0;
+ masterPtr->ditherY = validBox.height;
+ }
+ } else {
+ if ((masterPtr->ditherY > 0)
+ || ((int) validBox.width < masterPtr->ditherX)) {
+ masterPtr->ditherX = validBox.width;
+ masterPtr->ditherY = 0;
+ }
+ }
+ }
+
+ /*
+ * Now adjust the sizes of the pixmaps for all of the instances.
+ */
+
+ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
+ instancePtr = instancePtr->nextPtr) {
+ ImgPhotoInstanceSetSize(instancePtr);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ImgPhotoInstanceSetSize --
+ *
+ * This procedure reallocates the instance pixmap and dithering
+ * error array for a photo instance, as necessary, to change the
+ * image's size to `width' x `height' pixels.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Storage gets reallocated, here and in the X server.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ImgPhotoInstanceSetSize(instancePtr)
+ PhotoInstance *instancePtr; /* Instance whose size is to be
+ * changed. */
+{
+ PhotoMaster *masterPtr;
+ schar *newError;
+ schar *errSrcPtr, *errDestPtr;
+ int h, offset;
+ XRectangle validBox;
+ Pixmap newPixmap;
+
+ masterPtr = instancePtr->masterPtr;
+ TkClipBox(masterPtr->validRegion, &validBox);
+
+ if ((instancePtr->width != masterPtr->width)
+ || (instancePtr->height != masterPtr->height)
+ || (instancePtr->pixels == None)) {
+ newPixmap = Tk_GetPixmap(instancePtr->display,
+ RootWindow(instancePtr->display,
+ instancePtr->visualInfo.screen),
+ (masterPtr->width > 0) ? masterPtr->width: 1,
+ (masterPtr->height > 0) ? masterPtr->height: 1,
+ instancePtr->visualInfo.depth);
+
+ /*
+ * The following is a gross hack needed to properly support colormaps
+ * under Windows. Before the pixels can be copied to the pixmap,
+ * the relevent colormap must be associated with the drawable.
+ * Normally we can infer this association from the window that
+ * was used to create the pixmap. However, in this case we're
+ * using the root window, so we have to be more explicit.
+ */
+
+ TkSetPixmapColormap(newPixmap, instancePtr->colormap);
+
+ if (instancePtr->pixels != None) {
+ /*
+ * Copy any common pixels from the old pixmap and free it.
+ */
+ XCopyArea(instancePtr->display, instancePtr->pixels, newPixmap,
+ instancePtr->gc, validBox.x, validBox.y,
+ validBox.width, validBox.height, validBox.x, validBox.y);
+ Tk_FreePixmap(instancePtr->display, instancePtr->pixels);
+ }
+ instancePtr->pixels = newPixmap;
+ }
+
+ if ((instancePtr->width != masterPtr->width)
+ || (instancePtr->height != masterPtr->height)
+ || (instancePtr->error == NULL)) {
+
+ newError = (schar *) ckalloc((unsigned)
+ (masterPtr->height * masterPtr->width * 3 * sizeof(schar)));
+
+ /*
+ * Zero the new array so that we don't get bogus error values
+ * propagating into areas we dither later.
+ */
+
+ if ((instancePtr->error != NULL)
+ && ((instancePtr->width == masterPtr->width)
+ || (validBox.width == masterPtr->width))) {
+ if (validBox.y > 0) {
+ memset((VOID *) newError, 0, (size_t)
+ (validBox.y * masterPtr->width * 3 * sizeof(schar)));
+ }
+ h = validBox.y + validBox.height;
+ if (h < masterPtr->height) {
+ memset((VOID *) (newError + h * masterPtr->width * 3), 0,
+ (size_t) ((masterPtr->height - h)
+ * masterPtr->width * 3 * sizeof(schar)));
+ }
+ } else {
+ memset((VOID *) newError, 0, (size_t)
+ (masterPtr->height * masterPtr->width * 3 * sizeof(schar)));
+ }
+
+ if (instancePtr->error != NULL) {
+
+ /*
+ * Copy the common area over to the new array
+ * and free the old array.
+ */
+
+ if (masterPtr->width == instancePtr->width) {
+
+ offset = validBox.y * masterPtr->width * 3;
+ memcpy((VOID *) (newError + offset),
+ (VOID *) (instancePtr->error + offset),
+ (size_t) (validBox.height
+ * masterPtr->width * 3 * sizeof(schar)));
+
+ } else if (validBox.width > 0 && validBox.height > 0) {
+
+ errDestPtr = newError
+ + (validBox.y * masterPtr->width + validBox.x) * 3;
+ errSrcPtr = instancePtr->error
+ + (validBox.y * instancePtr->width + validBox.x) * 3;
+ for (h = validBox.height; h > 0; --h) {
+ memcpy((VOID *) errDestPtr, (VOID *) errSrcPtr,
+ validBox.width * 3 * sizeof(schar));
+ errDestPtr += masterPtr->width * 3;
+ errSrcPtr += instancePtr->width * 3;
+ }
+ }
+ ckfree((char *) instancePtr->error);
+ }
+
+ instancePtr->error = newError;
+ }
+
+ instancePtr->width = masterPtr->width;
+ instancePtr->height = masterPtr->height;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * IsValidPalette --
+ *
+ * This procedure is called to check whether a value given for
+ * the -palette option is valid for a particular instance
+ * of a photo image.
+ *
+ * Results:
+ * A boolean value: 1 if the palette is acceptable, 0 otherwise.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+IsValidPalette(instancePtr, palette)
+ PhotoInstance *instancePtr; /* Instance to which the palette
+ * specification is to be applied. */
+ char *palette; /* Palette specification string. */
+{
+ int nRed, nGreen, nBlue, mono, numColors;
+ char *endp;
+
+ /*
+ * First parse the specification: it must be of the form
+ * %d or %d/%d/%d.
+ */
+
+ nRed = strtol(palette, &endp, 10);
+ if ((endp == palette) || ((*endp != 0) && (*endp != '/'))
+ || (nRed < 2) || (nRed > 256)) {
+ return 0;
+ }
+
+ if (*endp == 0) {
+ mono = 1;
+ nGreen = nBlue = nRed;
+ } else {
+ palette = endp + 1;
+ nGreen = strtol(palette, &endp, 10);
+ if ((endp == palette) || (*endp != '/') || (nGreen < 2)
+ || (nGreen > 256)) {
+ return 0;
+ }
+ palette = endp + 1;
+ nBlue = strtol(palette, &endp, 10);
+ if ((endp == palette) || (*endp != 0) || (nBlue < 2)
+ || (nBlue > 256)) {
+ return 0;
+ }
+ mono = 0;
+ }
+
+ switch (instancePtr->visualInfo.class) {
+ case DirectColor:
+ case TrueColor:
+ if ((nRed > (1 << CountBits(instancePtr->visualInfo.red_mask)))
+ || (nGreen > (1
+ << CountBits(instancePtr->visualInfo.green_mask)))
+ || (nBlue > (1
+ << CountBits(instancePtr->visualInfo.blue_mask)))) {
+ return 0;
+ }
+ break;
+ case PseudoColor:
+ case StaticColor:
+ numColors = nRed;
+ if (!mono) {
+ numColors *= nGreen*nBlue;
+ }
+ if (numColors > (1 << instancePtr->visualInfo.depth)) {
+ return 0;
+ }
+ break;
+ case GrayScale:
+ case StaticGray:
+ if (!mono || (nRed > (1 << instancePtr->visualInfo.depth))) {
+ return 0;
+ }
+ break;
+ }
+
+ return 1;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * CountBits --
+ *
+ * This procedure counts how many bits are set to 1 in `mask'.
+ *
+ * Results:
+ * The integer number of bits.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+CountBits(mask)
+ pixel mask; /* Value to count the 1 bits in. */
+{
+ int n;
+
+ for( n = 0; mask != 0; mask &= mask - 1 )
+ n++;
+ return n;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * GetColorTable --
+ *
+ * This procedure is called to allocate a table of colormap
+ * information for an instance of a photo image. Only one such
+ * table is allocated for all photo instances using the same
+ * display, colormap, palette and gamma values, so that the
+ * application need only request a set of colors from the X
+ * server once for all such photo widgets. This procedure
+ * maintains a hash table to find previously-allocated
+ * ColorTables.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * A new ColorTable may be allocated and placed in the hash
+ * table, and have colors allocated for it.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+GetColorTable(instancePtr)
+ PhotoInstance *instancePtr; /* Instance needing a color table. */
+{
+ ColorTable *colorPtr;
+ Tcl_HashEntry *entry;
+ ColorTableId id;
+ int isNew;
+
+ /*
+ * Look for an existing ColorTable in the hash table.
+ */
+
+ memset((VOID *) &id, 0, sizeof(id));
+ id.display = instancePtr->display;
+ id.colormap = instancePtr->colormap;
+ id.palette = instancePtr->palette;
+ id.gamma = instancePtr->gamma;
+ if (!imgPhotoColorHashInitialized) {
+ Tcl_InitHashTable(&imgPhotoColorHash, N_COLOR_HASH);
+ imgPhotoColorHashInitialized = 1;
+ }
+ entry = Tcl_CreateHashEntry(&imgPhotoColorHash, (char *) &id, &isNew);
+
+ if (!isNew) {
+ /*
+ * Re-use the existing entry.
+ */
+
+ colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
+
+ } else {
+ /*
+ * No color table currently available; need to make one.
+ */
+
+ colorPtr = (ColorTable *) ckalloc(sizeof(ColorTable));
+
+ /*
+ * The following line of code should not normally be needed due
+ * to the assignment in the following line. However, it compensates
+ * for bugs in some compilers (HP, for example) where
+ * sizeof(ColorTable) is 24 but the assignment only copies 20 bytes,
+ * leaving 4 bytes uninitialized; these cause problems when using
+ * the id for lookups in imgPhotoColorHash, and can result in
+ * core dumps.
+ */
+
+ memset((VOID *) &colorPtr->id, 0, sizeof(ColorTableId));
+ colorPtr->id = id;
+ Tk_PreserveColormap(colorPtr->id.display, colorPtr->id.colormap);
+ colorPtr->flags = 0;
+ colorPtr->refCount = 0;
+ colorPtr->liveRefCount = 0;
+ colorPtr->numColors = 0;
+ colorPtr->visualInfo = instancePtr->visualInfo;
+ colorPtr->pixelMap = NULL;
+ Tcl_SetHashValue(entry, colorPtr);
+ }
+
+ colorPtr->refCount++;
+ colorPtr->liveRefCount++;
+ instancePtr->colorTablePtr = colorPtr;
+ if (colorPtr->flags & DISPOSE_PENDING) {
+ Tcl_CancelIdleCall(DisposeColorTable, (ClientData) colorPtr);
+ colorPtr->flags &= ~DISPOSE_PENDING;
+ }
+
+ /*
+ * Allocate colors for this color table if necessary.
+ */
+
+ if ((colorPtr->numColors == 0)
+ && ((colorPtr->flags & BLACK_AND_WHITE) == 0)) {
+ AllocateColors(colorPtr);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * FreeColorTable --
+ *
+ * This procedure is called when an instance ceases using a
+ * color table.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * If no other instances are using this color table, a when-idle
+ * handler is registered to free up the color table and the colors
+ * allocated for it.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+FreeColorTable(colorPtr)
+ ColorTable *colorPtr; /* Pointer to the color table which is
+ * no longer required by an instance. */
+{
+ colorPtr->refCount--;
+ if (colorPtr->refCount > 0) {
+ return;
+ }
+ if ((colorPtr->flags & DISPOSE_PENDING) == 0) {
+ Tcl_DoWhenIdle(DisposeColorTable, (ClientData) colorPtr);
+ colorPtr->flags |= DISPOSE_PENDING;
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * AllocateColors --
+ *
+ * This procedure allocates the colors required by a color table,
+ * and sets up the fields in the color table data structure which
+ * are used in dithering.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Colors are allocated from the X server. Fields in the
+ * color table data structure are updated.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+AllocateColors(colorPtr)
+ ColorTable *colorPtr; /* Pointer to the color table requiring
+ * colors to be allocated. */
+{
+ int i, r, g, b, rMult, mono;
+ int numColors, nRed, nGreen, nBlue;
+ double fr, fg, fb, igam;
+ XColor *colors;
+ unsigned long *pixels;
+
+ /* 16-bit intensity value for i/n of full intensity. */
+# define CFRAC(i, n) ((i) * 65535 / (n))
+
+ /* As for CFRAC, but apply exponent of g. */
+# define CGFRAC(i, n, g) ((int)(65535 * pow((double)(i) / (n), (g))))
+
+ /*
+ * First parse the palette specification to get the required number of
+ * shades of each primary.
+ */
+
+ mono = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed, &nGreen, &nBlue)
+ <= 1;
+ igam = 1.0 / colorPtr->id.gamma;
+
+ /*
+ * Each time around this loop, we reduce the number of colors we're
+ * trying to allocate until we succeed in allocating all of the colors
+ * we need.
+ */
+
+ for (;;) {
+ /*
+ * If we are using 1 bit/pixel, we don't need to allocate
+ * any colors (we just use the foreground and background
+ * colors in the GC).
+ */
+
+ if (mono && (nRed <= 2)) {
+ colorPtr->flags |= BLACK_AND_WHITE;
+ return;
+ }
+
+ /*
+ * Calculate the RGB coordinates of the colors we want to
+ * allocate and store them in *colors.
+ */
+
+ if ((colorPtr->visualInfo.class == DirectColor)
+ || (colorPtr->visualInfo.class == TrueColor)) {
+
+ /*
+ * Direct/True Color: allocate shades of red, green, blue
+ * independently.
+ */
+
+ if (mono) {
+ numColors = nGreen = nBlue = nRed;
+ } else {
+ numColors = MAX(MAX(nRed, nGreen), nBlue);
+ }
+ colors = (XColor *) ckalloc(numColors * sizeof(XColor));
+
+ for (i = 0; i < numColors; ++i) {
+ if (igam == 1.0) {
+ colors[i].red = CFRAC(i, nRed - 1);
+ colors[i].green = CFRAC(i, nGreen - 1);
+ colors[i].blue = CFRAC(i, nBlue - 1);
+ } else {
+ colors[i].red = CGFRAC(i, nRed - 1, igam);
+ colors[i].green = CGFRAC(i, nGreen - 1, igam);
+ colors[i].blue = CGFRAC(i, nBlue - 1, igam);
+ }
+ }
+ } else {
+ /*
+ * PseudoColor, StaticColor, GrayScale or StaticGray visual:
+ * we have to allocate each color in the color cube separately.
+ */
+
+ numColors = (mono) ? nRed: (nRed * nGreen * nBlue);
+ colors = (XColor *) ckalloc(numColors * sizeof(XColor));
+
+ if (!mono) {
+ /*
+ * Color display using a PseudoColor or StaticColor visual.
+ */
+
+ i = 0;
+ for (r = 0; r < nRed; ++r) {
+ for (g = 0; g < nGreen; ++g) {
+ for (b = 0; b < nBlue; ++b) {
+ if (igam == 1.0) {
+ colors[i].red = CFRAC(r, nRed - 1);
+ colors[i].green = CFRAC(g, nGreen - 1);
+ colors[i].blue = CFRAC(b, nBlue - 1);
+ } else {
+ colors[i].red = CGFRAC(r, nRed - 1, igam);
+ colors[i].green = CGFRAC(g, nGreen - 1, igam);
+ colors[i].blue = CGFRAC(b, nBlue - 1, igam);
+ }
+ i++;
+ }
+ }
+ }
+ } else {
+ /*
+ * Monochrome display - allocate the shades of grey we want.
+ */
+
+ for (i = 0; i < numColors; ++i) {
+ if (igam == 1.0) {
+ r = CFRAC(i, numColors - 1);
+ } else {
+ r = CGFRAC(i, numColors - 1, igam);
+ }
+ colors[i].red = colors[i].green = colors[i].blue = r;
+ }
+ }
+ }
+
+ /*
+ * Now try to allocate the colors we've calculated.
+ */
+
+ pixels = (unsigned long *) ckalloc(numColors * sizeof(unsigned long));
+ for (i = 0; i < numColors; ++i) {
+ if (!XAllocColor(colorPtr->id.display, colorPtr->id.colormap,
+ &colors[i])) {
+
+ /*
+ * Can't get all the colors we want in the default colormap;
+ * first try freeing colors from other unused color tables.
+ */
+
+ if (!ReclaimColors(&colorPtr->id, numColors - i)
+ || !XAllocColor(colorPtr->id.display,
+ colorPtr->id.colormap, &colors[i])) {
+ /*
+ * Still can't allocate the color.
+ */
+ break;
+ }
+ }
+ pixels[i] = colors[i].pixel;
+ }
+
+ /*
+ * If we didn't get all of the colors, reduce the
+ * resolution of the color cube, free the ones we got,
+ * and try again.
+ */
+
+ if (i >= numColors) {
+ break;
+ }
+ XFreeColors(colorPtr->id.display, colorPtr->id.colormap, pixels, i, 0);
+ ckfree((char *) colors);
+ ckfree((char *) pixels);
+
+ if (!mono) {
+ if ((nRed == 2) && (nGreen == 2) && (nBlue == 2)) {
+ /*
+ * Fall back to 1-bit monochrome display.
+ */
+
+ mono = 1;
+ } else {
+ /*
+ * Reduce the number of shades of each primary to about
+ * 3/4 of the previous value. This should reduce the
+ * total number of colors required to about half the
+ * previous value for PseudoColor displays.
+ */
+
+ nRed = (nRed * 3 + 2) / 4;
+ nGreen = (nGreen * 3 + 2) / 4;
+ nBlue = (nBlue * 3 + 2) / 4;
+ }
+ } else {
+ /*
+ * Reduce the number of shades of gray to about 1/2.
+ */
+
+ nRed = nRed / 2;
+ }
+ }
+
+ /*
+ * We have allocated all of the necessary colors:
+ * fill in various fields of the ColorTable record.
+ */
+
+ if (!mono) {
+ colorPtr->flags |= COLOR_WINDOW;
+
+ /*
+ * The following is a hairy hack. We only want to index into
+ * the pixelMap on colormap displays. However, if the display
+ * is on Windows, then we actually want to store the index not
+ * the value since we will be passing the color table into the
+ * TkPutImage call.
+ */
+
+#ifndef __WIN32__
+ if ((colorPtr->visualInfo.class != DirectColor)
+ && (colorPtr->visualInfo.class != TrueColor)) {
+ colorPtr->flags |= MAP_COLORS;
+ }
+#endif /* __WIN32__ */
+ }
+
+ colorPtr->numColors = numColors;
+ colorPtr->pixelMap = pixels;
+
+ /*
+ * Set up quantization tables for dithering.
+ */
+ rMult = nGreen * nBlue;
+ for (i = 0; i < 256; ++i) {
+ r = (i * (nRed - 1) + 127) / 255;
+ if (mono) {
+ fr = (double) colors[r].red / 65535.0;
+ if (colorPtr->id.gamma != 1.0 ) {
+ fr = pow(fr, colorPtr->id.gamma);
+ }
+ colorPtr->colorQuant[0][i] = (int)(fr * 255.99);
+ colorPtr->redValues[i] = colors[r].pixel;
+ } else {
+ g = (i * (nGreen - 1) + 127) / 255;
+ b = (i * (nBlue - 1) + 127) / 255;
+ if ((colorPtr->visualInfo.class == DirectColor)
+ || (colorPtr->visualInfo.class == TrueColor)) {
+ colorPtr->redValues[i] = colors[r].pixel
+ & colorPtr->visualInfo.red_mask;
+ colorPtr->greenValues[i] = colors[g].pixel
+ & colorPtr->visualInfo.green_mask;
+ colorPtr->blueValues[i] = colors[b].pixel
+ & colorPtr->visualInfo.blue_mask;
+ } else {
+ r *= rMult;
+ g *= nBlue;
+ colorPtr->redValues[i] = r;
+ colorPtr->greenValues[i] = g;
+ colorPtr->blueValues[i] = b;
+ }
+ fr = (double) colors[r].red / 65535.0;
+ fg = (double) colors[g].green / 65535.0;
+ fb = (double) colors[b].blue / 65535.0;
+ if (colorPtr->id.gamma != 1.0) {
+ fr = pow(fr, colorPtr->id.gamma);
+ fg = pow(fg, colorPtr->id.gamma);
+ fb = pow(fb, colorPtr->id.gamma);
+ }
+ colorPtr->colorQuant[0][i] = (int)(fr * 255.99);
+ colorPtr->colorQuant[1][i] = (int)(fg * 255.99);
+ colorPtr->colorQuant[2][i] = (int)(fb * 255.99);
+ }
+ }
+
+ ckfree((char *) colors);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DisposeColorTable --
+ *
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The colors in the argument color table are freed, as is the
+ * color table structure itself. The color table is removed
+ * from the hash table which is used to locate color tables.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+DisposeColorTable(clientData)
+ ClientData clientData; /* Pointer to the ColorTable whose
+ * colors are to be released. */
+{
+ ColorTable *colorPtr;
+ Tcl_HashEntry *entry;
+
+ colorPtr = (ColorTable *) clientData;
+ if (colorPtr->pixelMap != NULL) {
+ if (colorPtr->numColors > 0) {
+ XFreeColors(colorPtr->id.display, colorPtr->id.colormap,
+ colorPtr->pixelMap, colorPtr->numColors, 0);
+ Tk_FreeColormap(colorPtr->id.display, colorPtr->id.colormap);
+ }
+ ckfree((char *) colorPtr->pixelMap);
+ }
+
+ entry = Tcl_FindHashEntry(&imgPhotoColorHash, (char *) &colorPtr->id);
+ if (entry == NULL) {
+ panic("DisposeColorTable couldn't find hash entry");
+ }
+ Tcl_DeleteHashEntry(entry);
+
+ ckfree((char *) colorPtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ReclaimColors --
+ *
+ * This procedure is called to try to free up colors in the
+ * colormap used by a color table. It looks for other color
+ * tables with the same colormap and with a zero live reference
+ * count, and frees their colors. It only does so if there is
+ * the possibility of freeing up at least `numColors' colors.
+ *
+ * Results:
+ * The return value is TRUE if any colors were freed, FALSE
+ * otherwise.
+ *
+ * Side effects:
+ * ColorTables which are not currently in use may lose their
+ * color allocations.
+ *
+ *---------------------------------------------------------------------- */
+
+static int
+ReclaimColors(id, numColors)
+ ColorTableId *id; /* Pointer to information identifying
+ * the color table which needs more colors. */
+ int numColors; /* Number of colors required. */
+{
+ Tcl_HashSearch srch;
+ Tcl_HashEntry *entry;
+ ColorTable *colorPtr;
+ int nAvail;
+
+ /*
+ * First scan through the color hash table to get an
+ * upper bound on how many colors we might be able to free.
+ */
+
+ nAvail = 0;
+ entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch);
+ while (entry != NULL) {
+ colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
+ if ((colorPtr->id.display == id->display)
+ && (colorPtr->id.colormap == id->colormap)
+ && (colorPtr->liveRefCount == 0 )&& (colorPtr->numColors != 0)
+ && ((colorPtr->id.palette != id->palette)
+ || (colorPtr->id.gamma != id->gamma))) {
+
+ /*
+ * We could take this guy's colors off him.
+ */
+
+ nAvail += colorPtr->numColors;
+ }
+ entry = Tcl_NextHashEntry(&srch);
+ }
+
+ /*
+ * nAvail is an (over)estimate of the number of colors we could free.
+ */
+
+ if (nAvail < numColors) {
+ return 0;
+ }
+
+ /*
+ * Scan through a second time freeing colors.
+ */
+
+ entry = Tcl_FirstHashEntry(&imgPhotoColorHash, &srch);
+ while ((entry != NULL) && (numColors > 0)) {
+ colorPtr = (ColorTable *) Tcl_GetHashValue(entry);
+ if ((colorPtr->id.display == id->display)
+ && (colorPtr->id.colormap == id->colormap)
+ && (colorPtr->liveRefCount == 0) && (colorPtr->numColors != 0)
+ && ((colorPtr->id.palette != id->palette)
+ || (colorPtr->id.gamma != id->gamma))) {
+
+ /*
+ * Free the colors that this ColorTable has.
+ */
+
+ XFreeColors(colorPtr->id.display, colorPtr->id.colormap,
+ colorPtr->pixelMap, colorPtr->numColors, 0);
+ numColors -= colorPtr->numColors;
+ colorPtr->numColors = 0;
+ ckfree((char *) colorPtr->pixelMap);
+ colorPtr->pixelMap = NULL;
+ }
+
+ entry = Tcl_NextHashEntry(&srch);
+ }
+ return 1; /* we freed some colors */
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DisposeInstance --
+ *
+ * This procedure is called to finally free up an instance
+ * of a photo image which is no longer required.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The instance data structure and the resources it references
+ * are freed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+DisposeInstance(clientData)
+ ClientData clientData; /* Pointer to the instance whose resources
+ * are to be released. */
+{
+ PhotoInstance *instancePtr = (PhotoInstance *) clientData;
+ PhotoInstance *prevPtr;
+
+ if (instancePtr->pixels != None) {
+ Tk_FreePixmap(instancePtr->display, instancePtr->pixels);
+ }
+ if (instancePtr->gc != None) {
+ Tk_FreeGC(instancePtr->display, instancePtr->gc);
+ }
+ if (instancePtr->imagePtr != NULL) {
+ XFree((char *) instancePtr->imagePtr);
+ }
+ if (instancePtr->error != NULL) {
+ ckfree((char *) instancePtr->error);
+ }
+ if (instancePtr->colorTablePtr != NULL) {
+ FreeColorTable(instancePtr->colorTablePtr);
+ }
+
+ if (instancePtr->masterPtr->instancePtr == instancePtr) {
+ instancePtr->masterPtr->instancePtr = instancePtr->nextPtr;
+ } else {
+ for (prevPtr = instancePtr->masterPtr->instancePtr;
+ prevPtr->nextPtr != instancePtr; prevPtr = prevPtr->nextPtr) {
+ /* Empty loop body */
+ }
+ prevPtr->nextPtr = instancePtr->nextPtr;
+ }
+ Tk_FreeColormap(instancePtr->display, instancePtr->colormap);
+ ckfree((char *) instancePtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * MatchFileFormat --
+ *
+ * This procedure is called to find a photo image file format
+ * handler which can parse the image data in the given file.
+ * If a user-specified format string is provided, only handlers
+ * whose names match a prefix of the format string are tried.
+ *
+ * Results:
+ * A standard TCL return value. If the return value is TCL_OK, a
+ * pointer to the image format record is returned in
+ * *imageFormatPtr, and the width and height of the image are
+ * returned in *widthPtr and *heightPtr.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+MatchFileFormat(interp, chan, fileName, formatString, imageFormatPtr,
+ widthPtr, heightPtr)
+ Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
+ Tcl_Channel chan; /* The image file, open for reading. */
+ char *fileName; /* The name of the image file. */
+ char *formatString; /* User-specified format string, or NULL. */
+ Tk_PhotoImageFormat **imageFormatPtr;
+ /* A pointer to the photo image format
+ * record is returned here. */
+ int *widthPtr, *heightPtr; /* The dimensions of the image are
+ * returned here. */
+{
+ int matched;
+ Tk_PhotoImageFormat *formatPtr;
+
+ /*
+ * Scan through the table of file format handlers to find
+ * one which can handle the image.
+ */
+
+ matched = 0;
+ for (formatPtr = formatList; formatPtr != NULL;
+ formatPtr = formatPtr->nextPtr) {
+ if (formatString != NULL) {
+ if (strncasecmp(formatString, formatPtr->name,
+ strlen(formatPtr->name)) != 0) {
+ continue;
+ }
+ matched = 1;
+ if (formatPtr->fileMatchProc == NULL) {
+ Tcl_AppendResult(interp, "-file option isn't supported for ",
+ formatString, " images", (char *) NULL);
+ return TCL_ERROR;
+ }
+ }
+ if (formatPtr->fileMatchProc != NULL) {
+ (void) Tcl_Seek(chan, 0L, SEEK_SET);
+
+ if ((*formatPtr->fileMatchProc)(chan, fileName, formatString,
+ widthPtr, heightPtr)) {
+ if (*widthPtr < 1) {
+ *widthPtr = 1;
+ }
+ if (*heightPtr < 1) {
+ *heightPtr = 1;
+ }
+ break;
+ }
+ }
+ }
+
+ if (formatPtr == NULL) {
+ if ((formatString != NULL) && !matched) {
+ Tcl_AppendResult(interp, "image file format \"", formatString,
+ "\" is not supported", (char *) NULL);
+ } else {
+ Tcl_AppendResult(interp,
+ "couldn't recognize data in image file \"",
+ fileName, "\"", (char *) NULL);
+ }
+ return TCL_ERROR;
+ }
+
+ *imageFormatPtr = formatPtr;
+ (void) Tcl_Seek(chan, 0L, SEEK_SET);
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * MatchStringFormat --
+ *
+ * This procedure is called to find a photo image file format
+ * handler which can parse the image data in the given string.
+ * If a user-specified format string is provided, only handlers
+ * whose names match a prefix of the format string are tried.
+ *
+ * Results:
+ * A standard TCL return value. If the return value is TCL_OK, a
+ * pointer to the image format record is returned in
+ * *imageFormatPtr, and the width and height of the image are
+ * returned in *widthPtr and *heightPtr.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+MatchStringFormat(interp, string, formatString, imageFormatPtr,
+ widthPtr, heightPtr)
+ Tcl_Interp *interp; /* Interpreter to use for reporting errors. */
+ char *string; /* String containing the image data. */
+ char *formatString; /* User-specified format string, or NULL. */
+ Tk_PhotoImageFormat **imageFormatPtr;
+ /* A pointer to the photo image format
+ * record is returned here. */
+ int *widthPtr, *heightPtr; /* The dimensions of the image are
+ * returned here. */
+{
+ int matched;
+ Tk_PhotoImageFormat *formatPtr;
+
+ /*
+ * Scan through the table of file format handlers to find
+ * one which can handle the image.
+ */
+
+ matched = 0;
+ for (formatPtr = formatList; formatPtr != NULL;
+ formatPtr = formatPtr->nextPtr) {
+ if (formatString != NULL) {
+ if (strncasecmp(formatString, formatPtr->name,
+ strlen(formatPtr->name)) != 0) {
+ continue;
+ }
+ matched = 1;
+ if (formatPtr->stringMatchProc == NULL) {
+ Tcl_AppendResult(interp, "-data option isn't supported for ",
+ formatString, " images", (char *) NULL);
+ return TCL_ERROR;
+ }
+ }
+ if ((formatPtr->stringMatchProc != NULL)
+ && (*formatPtr->stringMatchProc)(string, formatString,
+ widthPtr, heightPtr)) {
+ break;
+ }
+ }
+
+ if (formatPtr == NULL) {
+ if ((formatString != NULL) && !matched) {
+ Tcl_AppendResult(interp, "image format \"", formatString,
+ "\" is not supported", (char *) NULL);
+ } else {
+ Tcl_AppendResult(interp, "couldn't recognize image data",
+ (char *) NULL);
+ }
+ return TCL_ERROR;
+ }
+
+ *imageFormatPtr = formatPtr;
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_FindPhoto --
+ *
+ * This procedure is called to get an opaque handle (actually a
+ * PhotoMaster *) for a given image, which can be used in
+ * subsequent calls to Tk_PhotoPutBlock, etc. The `name'
+ * parameter is the name of the image.
+ *
+ * Results:
+ * The handle for the photo image, or NULL if there is no
+ * photo image with the name given.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+Tk_PhotoHandle
+Tk_FindPhoto(interp, imageName)
+ Tcl_Interp *interp; /* Interpreter (application) in which image
+ * exists. */
+ char *imageName; /* Name of the desired photo image. */
+{
+ ClientData clientData;
+ Tk_ImageType *typePtr;
+
+ clientData = Tk_GetImageMasterData(interp, imageName, &typePtr);
+ if (typePtr != &tkPhotoImageType) {
+ return NULL;
+ }
+ return (Tk_PhotoHandle) clientData;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoPutBlock --
+ *
+ * This procedure is called to put image data into a photo image.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The image data is stored. The image may be expanded.
+ * The Tk image code is informed that the image has changed.
+ *
+ *---------------------------------------------------------------------- */
+
+void
+Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height)
+ Tk_PhotoHandle handle; /* Opaque handle for the photo image
+ * to be updated. */
+ register Tk_PhotoImageBlock *blockPtr;
+ /* Pointer to a structure describing the
+ * pixel data to be copied into the image. */
+ int x, y; /* Coordinates of the top-left pixel to
+ * be updated in the image. */
+ int width, height; /* Dimensions of the area of the image
+ * to be updated. */
+{
+ register PhotoMaster *masterPtr;
+ int xEnd, yEnd;
+ int greenOffset, blueOffset;
+ int wLeft, hLeft;
+ int wCopy, hCopy;
+ unsigned char *srcPtr, *srcLinePtr;
+ unsigned char *destPtr, *destLinePtr;
+ int pitch;
+ XRectangle rect;
+
+ masterPtr = (PhotoMaster *) handle;
+
+ if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) {
+ width = masterPtr->userWidth - x;
+ }
+ if ((masterPtr->userHeight != 0)
+ && ((y + height) > masterPtr->userHeight)) {
+ height = masterPtr->userHeight - y;
+ }
+ if ((width <= 0) || (height <= 0))
+ return;
+
+ xEnd = x + width;
+ yEnd = y + height;
+ if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) {
+ ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width),
+ MAX(yEnd, masterPtr->height));
+ }
+
+ if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY)
+ && (x < masterPtr->ditherX))) {
+ /*
+ * The dithering isn't correct past the start of this block.
+ */
+ masterPtr->ditherX = x;
+ masterPtr->ditherY = y;
+ }
+
+ /*
+ * If this image block could have different red, green and blue
+ * components, mark it as a color image.
+ */
+
+ greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
+ blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
+ if ((greenOffset != 0) || (blueOffset != 0)) {
+ masterPtr->flags |= COLOR_IMAGE;
+ }
+
+ /*
+ * Copy the data into our local 24-bit/pixel array.
+ * If we can do it with a single memcpy, we do.
+ */
+
+ destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3;
+ pitch = masterPtr->width * 3;
+
+ if ((blockPtr->pixelSize == 3) && (greenOffset == 1) && (blueOffset == 2)
+ && (width <= blockPtr->width) && (height <= blockPtr->height)
+ && ((height == 1) || ((x == 0) && (width == masterPtr->width)
+ && (blockPtr->pitch == pitch)))) {
+ memcpy((VOID *) destLinePtr,
+ (VOID *) (blockPtr->pixelPtr + blockPtr->offset[0]),
+ (size_t) (height * width * 3));
+ } else {
+ for (hLeft = height; hLeft > 0;) {
+ srcLinePtr = blockPtr->pixelPtr + blockPtr->offset[0];
+ hCopy = MIN(hLeft, blockPtr->height);
+ hLeft -= hCopy;
+ for (; hCopy > 0; --hCopy) {
+ destPtr = destLinePtr;
+ for (wLeft = width; wLeft > 0;) {
+ wCopy = MIN(wLeft, blockPtr->width);
+ wLeft -= wCopy;
+ srcPtr = srcLinePtr;
+ for (; wCopy > 0; --wCopy) {
+ *destPtr++ = srcPtr[0];
+ *destPtr++ = srcPtr[greenOffset];
+ *destPtr++ = srcPtr[blueOffset];
+ srcPtr += blockPtr->pixelSize;
+ }
+ }
+ srcLinePtr += blockPtr->pitch;
+ destLinePtr += pitch;
+ }
+ }
+ }
+
+ /*
+ * Add this new block to the region which specifies which data is valid.
+ */
+
+ rect.x = x;
+ rect.y = y;
+ rect.width = width;
+ rect.height = height;
+ TkUnionRectWithRegion(&rect, masterPtr->validRegion,
+ masterPtr->validRegion);
+
+ /*
+ * Update each instance.
+ */
+
+ Dither(masterPtr, x, y, width, height);
+
+ /*
+ * Tell the core image code that this image has changed.
+ */
+
+ Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width,
+ masterPtr->height);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoPutZoomedBlock --
+ *
+ * This procedure is called to put image data into a photo image,
+ * with possible subsampling and/or zooming of the pixels.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The image data is stored. The image may be expanded.
+ * The Tk image code is informed that the image has changed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY,
+ subsampleX, subsampleY)
+ Tk_PhotoHandle handle; /* Opaque handle for the photo image
+ * to be updated. */
+ register Tk_PhotoImageBlock *blockPtr;
+ /* Pointer to a structure describing the
+ * pixel data to be copied into the image. */
+ int x, y; /* Coordinates of the top-left pixel to
+ * be updated in the image. */
+ int width, height; /* Dimensions of the area of the image
+ * to be updated. */
+ int zoomX, zoomY; /* Zoom factors for the X and Y axes. */
+ int subsampleX, subsampleY; /* Subsampling factors for the X and Y axes. */
+{
+ register PhotoMaster *masterPtr;
+ int xEnd, yEnd;
+ int greenOffset, blueOffset;
+ int wLeft, hLeft;
+ int wCopy, hCopy;
+ int blockWid, blockHt;
+ unsigned char *srcPtr, *srcLinePtr, *srcOrigPtr;
+ unsigned char *destPtr, *destLinePtr;
+ int pitch;
+ int xRepeat, yRepeat;
+ int blockXSkip, blockYSkip;
+ XRectangle rect;
+
+ if ((zoomX == 1) && (zoomY == 1) && (subsampleX == 1)
+ && (subsampleY == 1)) {
+ Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height);
+ return;
+ }
+
+ masterPtr = (PhotoMaster *) handle;
+
+ if ((zoomX <= 0) || (zoomY <= 0))
+ return;
+ if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) {
+ width = masterPtr->userWidth - x;
+ }
+ if ((masterPtr->userHeight != 0)
+ && ((y + height) > masterPtr->userHeight)) {
+ height = masterPtr->userHeight - y;
+ }
+ if ((width <= 0) || (height <= 0))
+ return;
+
+ xEnd = x + width;
+ yEnd = y + height;
+ if ((xEnd > masterPtr->width) || (yEnd > masterPtr->height)) {
+ int sameSrc = (blockPtr->pixelPtr == masterPtr->pix24);
+ ImgPhotoSetSize(masterPtr, MAX(xEnd, masterPtr->width),
+ MAX(yEnd, masterPtr->height));
+ if (sameSrc) {
+ blockPtr->pixelPtr = masterPtr->pix24;
+ }
+ }
+
+ if ((y < masterPtr->ditherY) || ((y == masterPtr->ditherY)
+ && (x < masterPtr->ditherX))) {
+ /*
+ * The dithering isn't correct past the start of this block.
+ */
+
+ masterPtr->ditherX = x;
+ masterPtr->ditherY = y;
+ }
+
+ /*
+ * If this image block could have different red, green and blue
+ * components, mark it as a color image.
+ */
+
+ greenOffset = blockPtr->offset[1] - blockPtr->offset[0];
+ blueOffset = blockPtr->offset[2] - blockPtr->offset[0];
+ if ((greenOffset != 0) || (blueOffset != 0)) {
+ masterPtr->flags |= COLOR_IMAGE;
+ }
+
+ /*
+ * Work out what area the pixel data in the block expands to after
+ * subsampling and zooming.
+ */
+
+ blockXSkip = subsampleX * blockPtr->pixelSize;
+ blockYSkip = subsampleY * blockPtr->pitch;
+ if (subsampleX > 0)
+ blockWid = ((blockPtr->width + subsampleX - 1) / subsampleX) * zoomX;
+ else if (subsampleX == 0)
+ blockWid = width;
+ else
+ blockWid = ((blockPtr->width - subsampleX - 1) / -subsampleX) * zoomX;
+ if (subsampleY > 0)
+ blockHt = ((blockPtr->height + subsampleY - 1) / subsampleY) * zoomY;
+ else if (subsampleY == 0)
+ blockHt = height;
+ else
+ blockHt = ((blockPtr->height - subsampleY - 1) / -subsampleY) * zoomY;
+
+ /*
+ * Copy the data into our local 24-bit/pixel array.
+ */
+
+ destLinePtr = masterPtr->pix24 + (y * masterPtr->width + x) * 3;
+ srcOrigPtr = blockPtr->pixelPtr + blockPtr->offset[0];
+ if (subsampleX < 0) {
+ srcOrigPtr += (blockPtr->width - 1) * blockPtr->pixelSize;
+ }
+ if (subsampleY < 0) {
+ srcOrigPtr += (blockPtr->height - 1) * blockPtr->pitch;
+ }
+
+ pitch = masterPtr->width * 3;
+ for (hLeft = height; hLeft > 0; ) {
+ hCopy = MIN(hLeft, blockHt);
+ hLeft -= hCopy;
+ yRepeat = zoomY;
+ srcLinePtr = srcOrigPtr;
+ for (; hCopy > 0; --hCopy) {
+ destPtr = destLinePtr;
+ for (wLeft = width; wLeft > 0;) {
+ wCopy = MIN(wLeft, blockWid);
+ wLeft -= wCopy;
+ srcPtr = srcLinePtr;
+ for (; wCopy > 0; wCopy -= zoomX) {
+ for (xRepeat = MIN(wCopy, zoomX); xRepeat > 0; xRepeat--) {
+ *destPtr++ = srcPtr[0];
+ *destPtr++ = srcPtr[greenOffset];
+ *destPtr++ = srcPtr[blueOffset];
+ }
+ srcPtr += blockXSkip;
+ }
+ }
+ destLinePtr += pitch;
+ yRepeat--;
+ if (yRepeat <= 0) {
+ srcLinePtr += blockYSkip;
+ yRepeat = zoomY;
+ }
+ }
+ }
+
+ /*
+ * Add this new block to the region that specifies which data is valid.
+ */
+
+ rect.x = x;
+ rect.y = y;
+ rect.width = width;
+ rect.height = height;
+ TkUnionRectWithRegion(&rect, masterPtr->validRegion,
+ masterPtr->validRegion);
+
+ /*
+ * Update each instance.
+ */
+
+ Dither(masterPtr, x, y, width, height);
+
+ /*
+ * Tell the core image code that this image has changed.
+ */
+
+ Tk_ImageChanged(masterPtr->tkMaster, x, y, width, height, masterPtr->width,
+ masterPtr->height);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Dither --
+ *
+ * This procedure is called to update an area of each instance's
+ * pixmap by dithering the corresponding area of the image master.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The pixmap of each instance of this image gets updated.
+ * The fields in *masterPtr indicating which area of the image
+ * is correctly dithered get updated.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+Dither(masterPtr, x, y, width, height)
+ PhotoMaster *masterPtr; /* Image master whose instances are
+ * to be updated. */
+ int x, y; /* Coordinates of the top-left pixel
+ * in the area to be dithered. */
+ int width, height; /* Dimensions of the area to be dithered. */
+{
+ PhotoInstance *instancePtr;
+
+ if ((width <= 0) || (height <= 0)) {
+ return;
+ }
+
+ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
+ instancePtr = instancePtr->nextPtr) {
+ DitherInstance(instancePtr, x, y, width, height);
+ }
+
+ /*
+ * Work out whether this block will be correctly dithered
+ * and whether it will extend the correctly dithered region.
+ */
+
+ if (((y < masterPtr->ditherY)
+ || ((y == masterPtr->ditherY) && (x <= masterPtr->ditherX)))
+ && ((y + height) > (masterPtr->ditherY))) {
+
+ /*
+ * This block starts inside (or immediately after) the correctly
+ * dithered region, so the first scan line at least will be right.
+ * Furthermore this block extends into scanline masterPtr->ditherY.
+ */
+
+ if ((x == 0) && (width == masterPtr->width)) {
+ /*
+ * We are doing the full width, therefore the dithering
+ * will be correct to the end.
+ */
+
+ masterPtr->ditherX = 0;
+ masterPtr->ditherY = y + height;
+ } else {
+ /*
+ * We are doing partial scanlines, therefore the
+ * correctly-dithered region will be extended by
+ * at most one scan line.
+ */
+
+ if (x <= masterPtr->ditherX) {
+ masterPtr->ditherX = x + width;
+ if (masterPtr->ditherX >= masterPtr->width) {
+ masterPtr->ditherX = 0;
+ masterPtr->ditherY++;
+ }
+ }
+ }
+ }
+
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DitherInstance --
+ *
+ * This procedure is called to update an area of an instance's
+ * pixmap by dithering the corresponding area of the master.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The instance's pixmap gets updated.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+DitherInstance(instancePtr, xStart, yStart, width, height)
+ PhotoInstance *instancePtr; /* The instance to be updated. */
+ int xStart, yStart; /* Coordinates of the top-left pixel in the
+ * block to be dithered. */
+ int width, height; /* Dimensions of the block to be dithered. */
+{
+ PhotoMaster *masterPtr;
+ ColorTable *colorPtr;
+ XImage *imagePtr;
+ int nLines, bigEndian;
+ int i, c, x, y;
+ int xEnd, yEnd;
+ int bitsPerPixel, bytesPerLine, lineLength;
+ unsigned char *srcLinePtr, *srcPtr;
+ schar *errLinePtr, *errPtr;
+ unsigned char *destBytePtr, *dstLinePtr;
+ pixel *destLongPtr;
+ pixel firstBit, word, mask;
+ int col[3];
+ int doDithering = 1;
+
+ colorPtr = instancePtr->colorTablePtr;
+ masterPtr = instancePtr->masterPtr;
+
+ /*
+ * Turn dithering off in certain cases where it is not
+ * needed (TrueColor, DirectColor with many colors).
+ */
+
+ if ((colorPtr->visualInfo.class == DirectColor)
+ || (colorPtr->visualInfo.class == TrueColor)) {
+ int nRed, nGreen, nBlue, result;
+
+ result = sscanf(colorPtr->id.palette, "%d/%d/%d", &nRed,
+ &nGreen, &nBlue);
+ if ((nRed >= 256)
+ && ((result == 1) || ((nGreen >= 256) && (nBlue >= 256)))) {
+ doDithering = 0;
+ }
+ }
+
+ /*
+ * First work out how many lines to do at a time,
+ * then how many bytes we'll need for pixel storage,
+ * and allocate it.
+ */
+
+ nLines = (MAX_PIXELS + width - 1) / width;
+ if (nLines < 1) {
+ nLines = 1;
+ }
+ if (nLines > height ) {
+ nLines = height;
+ }
+
+ imagePtr = instancePtr->imagePtr;
+ if (imagePtr == NULL) {
+ return; /* we must be really tight on memory */
+ }
+ bitsPerPixel = imagePtr->bits_per_pixel;
+ bytesPerLine = ((bitsPerPixel * width + 31) >> 3) & ~3;
+ imagePtr->width = width;
+ imagePtr->height = nLines;
+ imagePtr->bytes_per_line = bytesPerLine;
+ imagePtr->data = (char *) ckalloc((unsigned) (imagePtr->bytes_per_line * nLines));
+ bigEndian = imagePtr->bitmap_bit_order == MSBFirst;
+ firstBit = bigEndian? (1 << (imagePtr->bitmap_unit - 1)): 1;
+
+ lineLength = masterPtr->width * 3;
+ srcLinePtr = masterPtr->pix24 + yStart * lineLength + xStart * 3;
+ errLinePtr = instancePtr->error + yStart * lineLength + xStart * 3;
+ xEnd = xStart + width;
+
+ /*
+ * Loop over the image, doing at most nLines lines before
+ * updating the screen image.
+ */
+
+ for (; height > 0; height -= nLines) {
+ if (nLines > height) {
+ nLines = height;
+ }
+ dstLinePtr = (unsigned char *) imagePtr->data;
+ yEnd = yStart + nLines;
+ for (y = yStart; y < yEnd; ++y) {
+ srcPtr = srcLinePtr;
+ errPtr = errLinePtr;
+ destBytePtr = dstLinePtr;
+ destLongPtr = (pixel *) dstLinePtr;
+ if (colorPtr->flags & COLOR_WINDOW) {
+ /*
+ * Color window. We dither the three components
+ * independently, using Floyd-Steinberg dithering,
+ * which propagates errors from the quantization of
+ * pixels to the pixels below and to the right.
+ */
+
+ for (x = xStart; x < xEnd; ++x) {
+ if (doDithering) {
+ for (i = 0; i < 3; ++i) {
+ /*
+ * Compute the error propagated into this pixel
+ * for this component.
+ * If e[x,y] is the array of quantization error
+ * values, we compute
+ * 7/16 * e[x-1,y] + 1/16 * e[x-1,y-1]
+ * + 5/16 * e[x,y-1] + 3/16 * e[x+1,y-1]
+ * and round it to an integer.
+ *
+ * The expression ((c + 2056) >> 4) - 128
+ * computes round(c / 16), and works correctly on
+ * machines without a sign-extending right shift.
+ */
+
+ c = (x > 0) ? errPtr[-3] * 7: 0;
+ if (y > 0) {
+ if (x > 0) {
+ c += errPtr[-lineLength-3];
+ }
+ c += errPtr[-lineLength] * 5;
+ if ((x + 1) < masterPtr->width) {
+ c += errPtr[-lineLength+3] * 3;
+ }
+ }
+
+ /*
+ * Add the propagated error to the value of this
+ * component, quantize it, and store the
+ * quantization error.
+ */
+
+ c = ((c + 2056) >> 4) - 128 + *srcPtr++;
+ if (c < 0) {
+ c = 0;
+ } else if (c > 255) {
+ c = 255;
+ }
+ col[i] = colorPtr->colorQuant[i][c];
+ *errPtr++ = c - col[i];
+ }
+ } else {
+ /*
+ * Output is virtually continuous in this case,
+ * so don't bother dithering.
+ */
+
+ col[0] = *srcPtr++;
+ col[1] = *srcPtr++;
+ col[2] = *srcPtr++;
+ }
+
+ /*
+ * Translate the quantized component values into
+ * an X pixel value, and store it in the image.
+ */
+
+ i = colorPtr->redValues[col[0]]
+ + colorPtr->greenValues[col[1]]
+ + colorPtr->blueValues[col[2]];
+ if (colorPtr->flags & MAP_COLORS) {
+ i = colorPtr->pixelMap[i];
+ }
+ switch (bitsPerPixel) {
+ case NBBY:
+ *destBytePtr++ = i;
+ break;
+#ifndef __WIN32__
+/*
+ * This case is not valid for Windows because the image format is different
+ * from the pixel format in Win32. Eventually we need to fix the image
+ * code in Tk to use the Windows native image ordering. This would speed
+ * up the image code for all of the common sizes.
+ */
+
+ case NBBY * sizeof(pixel):
+ *destLongPtr++ = i;
+ break;
+#endif
+ default:
+ XPutPixel(imagePtr, x - xStart, y - yStart,
+ (unsigned) i);
+ }
+ }
+
+ } else if (bitsPerPixel > 1) {
+ /*
+ * Multibit monochrome window. The operation here is similar
+ * to the color window case above, except that there is only
+ * one component. If the master image is in color, use the
+ * luminance computed as
+ * 0.344 * red + 0.5 * green + 0.156 * blue.
+ */
+
+ for (x = xStart; x < xEnd; ++x) {
+ c = (x > 0) ? errPtr[-1] * 7: 0;
+ if (y > 0) {
+ if (x > 0) {
+ c += errPtr[-lineLength-1];
+ }
+ c += errPtr[-lineLength] * 5;
+ if (x + 1 < masterPtr->width) {
+ c += errPtr[-lineLength+1] * 3;
+ }
+ }
+ c = ((c + 2056) >> 4) - 128;
+
+ if ((masterPtr->flags & COLOR_IMAGE) == 0) {
+ c += srcPtr[0];
+ } else {
+ c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16
+ + srcPtr[2] * 5 + 16) >> 5;
+ }
+ srcPtr += 3;
+
+ if (c < 0) {
+ c = 0;
+ } else if (c > 255) {
+ c = 255;
+ }
+ i = colorPtr->colorQuant[0][c];
+ *errPtr++ = c - i;
+ i = colorPtr->redValues[i];
+ switch (bitsPerPixel) {
+ case NBBY:
+ *destBytePtr++ = i;
+ break;
+#ifndef __WIN32__
+/*
+ * This case is not valid for Windows because the image format is different
+ * from the pixel format in Win32. Eventually we need to fix the image
+ * code in Tk to use the Windows native image ordering. This would speed
+ * up the image code for all of the common sizes.
+ */
+
+ case NBBY * sizeof(pixel):
+ *destLongPtr++ = i;
+ break;
+#endif
+ default:
+ XPutPixel(imagePtr, x - xStart, y - yStart,
+ (unsigned) i);
+ }
+ }
+ } else {
+ /*
+ * 1-bit monochrome window. This is similar to the
+ * multibit monochrome case above, except that the
+ * quantization is simpler (we only have black = 0
+ * and white = 255), and we produce an XY-Bitmap.
+ */
+
+ word = 0;
+ mask = firstBit;
+ for (x = xStart; x < xEnd; ++x) {
+ /*
+ * If we have accumulated a whole word, store it
+ * in the image and start a new word.
+ */
+
+ if (mask == 0) {
+ *destLongPtr++ = word;
+ mask = firstBit;
+ word = 0;
+ }
+
+ c = (x > 0) ? errPtr[-1] * 7: 0;
+ if (y > 0) {
+ if (x > 0) {
+ c += errPtr[-lineLength-1];
+ }
+ c += errPtr[-lineLength] * 5;
+ if (x + 1 < masterPtr->width) {
+ c += errPtr[-lineLength+1] * 3;
+ }
+ }
+ c = ((c + 2056) >> 4) - 128;
+
+ if ((masterPtr->flags & COLOR_IMAGE) == 0) {
+ c += srcPtr[0];
+ } else {
+ c += (unsigned)(srcPtr[0] * 11 + srcPtr[1] * 16
+ + srcPtr[2] * 5 + 16) >> 5;
+ }
+ srcPtr += 3;
+
+ if (c < 0) {
+ c = 0;
+ } else if (c > 255) {
+ c = 255;
+ }
+ if (c >= 128) {
+ word |= mask;
+ *errPtr++ = c - 255;
+ } else {
+ *errPtr++ = c;
+ }
+ mask = bigEndian? (mask >> 1): (mask << 1);
+ }
+ *destLongPtr = word;
+ }
+ srcLinePtr += lineLength;
+ errLinePtr += lineLength;
+ dstLinePtr += bytesPerLine;
+ }
+
+ /*
+ * Update the pixmap for this instance with the block of
+ * pixels that we have just computed.
+ */
+
+ TkPutImage(colorPtr->pixelMap, colorPtr->numColors,
+ instancePtr->display, instancePtr->pixels,
+ instancePtr->gc, imagePtr, 0, 0, xStart, yStart,
+ (unsigned) width, (unsigned) nLines);
+ yStart = yEnd;
+
+ }
+
+ ckfree(imagePtr->data);
+ imagePtr->data = NULL;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoBlank --
+ *
+ * This procedure is called to clear an entire photo image.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The valid region for the image is set to the null region.
+ * The generic image code is notified that the image has changed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_PhotoBlank(handle)
+ Tk_PhotoHandle handle; /* Handle for the image to be blanked. */
+{
+ PhotoMaster *masterPtr;
+ PhotoInstance *instancePtr;
+
+ masterPtr = (PhotoMaster *) handle;
+ masterPtr->ditherX = masterPtr->ditherY = 0;
+ masterPtr->flags = 0;
+
+ /*
+ * The image has valid data nowhere.
+ */
+
+ if (masterPtr->validRegion != NULL) {
+ TkDestroyRegion(masterPtr->validRegion);
+ }
+ masterPtr->validRegion = TkCreateRegion();
+
+ /*
+ * Clear out the 24-bit pixel storage array.
+ * Clear out the dithering error arrays for each instance.
+ */
+
+ memset((VOID *) masterPtr->pix24, 0,
+ (size_t) (masterPtr->width * masterPtr->height * 3));
+ for (instancePtr = masterPtr->instancePtr; instancePtr != NULL;
+ instancePtr = instancePtr->nextPtr) {
+ if (instancePtr->error) {
+ memset((VOID *) instancePtr->error, 0,
+ (size_t) (masterPtr->width * masterPtr->height
+ * 3 * sizeof(schar)));
+ }
+ }
+
+ /*
+ * Tell the core image code that this image has changed.
+ */
+
+ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width,
+ masterPtr->height, masterPtr->width, masterPtr->height);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoExpand --
+ *
+ * This procedure is called to request that a photo image be
+ * expanded if necessary to be at least `width' pixels wide and
+ * `height' pixels high. If the user has declared a definite
+ * image size (using the -width and -height configuration
+ * options) then this call has no effect.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The size of the photo image may change; if so the generic
+ * image code is informed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_PhotoExpand(handle, width, height)
+ Tk_PhotoHandle handle; /* Handle for the image to be expanded. */
+ int width, height; /* Desired minimum dimensions of the image. */
+{
+ PhotoMaster *masterPtr;
+
+ masterPtr = (PhotoMaster *) handle;
+
+ if (width <= masterPtr->width) {
+ width = masterPtr->width;
+ }
+ if (height <= masterPtr->height) {
+ height = masterPtr->height;
+ }
+ if ((width != masterPtr->width) || (height != masterPtr->height)) {
+ ImgPhotoSetSize(masterPtr, MAX(width, masterPtr->width),
+ MAX(height, masterPtr->height));
+ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0, masterPtr->width,
+ masterPtr->height);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoGetSize --
+ *
+ * This procedure is called to obtain the current size of a photo
+ * image.
+ *
+ * Results:
+ * The image's width and height are returned in *widthp
+ * and *heightp.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_PhotoGetSize(handle, widthPtr, heightPtr)
+ Tk_PhotoHandle handle; /* Handle for the image whose dimensions
+ * are requested. */
+ int *widthPtr, *heightPtr; /* The dimensions of the image are returned
+ * here. */
+{
+ PhotoMaster *masterPtr;
+
+ masterPtr = (PhotoMaster *) handle;
+ *widthPtr = masterPtr->width;
+ *heightPtr = masterPtr->height;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoSetSize --
+ *
+ * This procedure is called to set size of a photo image.
+ * This call is equivalent to using the -width and -height
+ * configuration options.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The size of the image may change; if so the generic
+ * image code is informed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+Tk_PhotoSetSize(handle, width, height)
+ Tk_PhotoHandle handle; /* Handle for the image whose size is to
+ * be set. */
+ int width, height; /* New dimensions for the image. */
+{
+ PhotoMaster *masterPtr;
+
+ masterPtr = (PhotoMaster *) handle;
+
+ masterPtr->userWidth = width;
+ masterPtr->userHeight = height;
+ ImgPhotoSetSize(masterPtr, ((width > 0) ? width: masterPtr->width),
+ ((height > 0) ? height: masterPtr->height));
+ Tk_ImageChanged(masterPtr->tkMaster, 0, 0, 0, 0,
+ masterPtr->width, masterPtr->height);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Tk_PhotoGetImage --
+ *
+ * This procedure is called to obtain image data from a photo
+ * image. This procedure fills in the Tk_PhotoImageBlock structure
+ * pointed to by `blockPtr' with details of the address and
+ * layout of the image data in memory.
+ *
+ * Results:
+ * TRUE (1) indicating that image data is available,
+ * for backwards compatibility with the old photo widget.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Tk_PhotoGetImage(handle, blockPtr)
+ Tk_PhotoHandle handle; /* Handle for the photo image from which
+ * image data is desired. */
+ Tk_PhotoImageBlock *blockPtr;
+ /* Information about the address and layout
+ * of the image data is returned here. */
+{
+ PhotoMaster *masterPtr;
+
+ masterPtr = (PhotoMaster *) handle;
+ blockPtr->pixelPtr = masterPtr->pix24;
+ blockPtr->width = masterPtr->width;
+ blockPtr->height = masterPtr->height;
+ blockPtr->pitch = masterPtr->width * 3;
+ blockPtr->pixelSize = 3;
+ blockPtr->offset[0] = 0;
+ blockPtr->offset[1] = 1;
+ blockPtr->offset[2] = 2;
+ return 1;
+}