diff options
Diffstat (limited to 'generic/tkImgBmap.c')
| -rw-r--r-- | generic/tkImgBmap.c | 1061 |
1 files changed, 1061 insertions, 0 deletions
diff --git a/generic/tkImgBmap.c b/generic/tkImgBmap.c new file mode 100644 index 0000000..f8a1d6e --- /dev/null +++ b/generic/tkImgBmap.c @@ -0,0 +1,1061 @@ +/* + * tkImgBmap.c -- + * + * This procedure implements images of type "bitmap" for Tk. + * + * Copyright (c) 1994 The Regents of the University of California. + * 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. + * + * SCCS: @(#) tkImgBmap.c 1.33 97/07/31 09:08:22 + */ + +#include "tkInt.h" +#include "tkPort.h" + +/* + * The following data structure represents the master for a bitmap + * image: + */ + +typedef struct BitmapMaster { + Tk_ImageMaster tkMaster; /* Tk's token for image master. NULL means + * the image is being deleted. */ + Tcl_Interp *interp; /* Interpreter for application that is + * using 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 width, height; /* Dimensions of image. */ + char *data; /* Data comprising bitmap (suitable for + * input to XCreateBitmapFromData). May + * be NULL if no data. Malloc'ed. */ + char *maskData; /* Data for bitmap's mask (suitable for + * input to XCreateBitmapFromData). + * Malloc'ed. */ + Tk_Uid fgUid; /* Value of -foreground option (malloc'ed). */ + Tk_Uid bgUid; /* Value of -background option (malloc'ed). */ + char *fileString; /* Value of -file option (malloc'ed). */ + char *dataString; /* Value of -data option (malloc'ed). */ + char *maskFileString; /* Value of -maskfile option (malloc'ed). */ + char *maskDataString; /* Value of -maskdata option (malloc'ed). */ + struct BitmapInstance *instancePtr; + /* First in list of all instances associated + * with this master. */ +} BitmapMaster; + +/* + * The following data structure represents all of the instances of an + * image that lie within a particular window: + */ + +typedef struct BitmapInstance { + int refCount; /* Number of instances that share this + * data structure. */ + BitmapMaster *masterPtr; /* Pointer to master for image. */ + Tk_Window tkwin; /* Window in which the instances will be + * displayed. */ + XColor *fg; /* Foreground color for displaying image. */ + XColor *bg; /* Background color for displaying image. */ + Pixmap bitmap; /* The bitmap to display. */ + Pixmap mask; /* Mask: only display bitmap pixels where + * there are 1's here. */ + GC gc; /* Graphics context for displaying bitmap. + * None means there was an error while + * setting up the instance, so it cannot + * be displayed. */ + struct BitmapInstance *nextPtr; + /* Next in list of all instance structures + * associated with masterPtr (NULL means + * end of list). */ +} BitmapInstance; + +/* + * The type record for bitmap images: + */ + +static int GetByte _ANSI_ARGS_((Tcl_Channel chan)); +static int ImgBmapCreate _ANSI_ARGS_((Tcl_Interp *interp, + char *name, int argc, char **argv, + Tk_ImageType *typePtr, Tk_ImageMaster master, + ClientData *clientDataPtr)); +static ClientData ImgBmapGet _ANSI_ARGS_((Tk_Window tkwin, + ClientData clientData)); +static void ImgBmapDisplay _ANSI_ARGS_((ClientData clientData, + Display *display, Drawable drawable, + int imageX, int imageY, int width, int height, + int drawableX, int drawableY)); +static void ImgBmapFree _ANSI_ARGS_((ClientData clientData, + Display *display)); +static void ImgBmapDelete _ANSI_ARGS_((ClientData clientData)); + +Tk_ImageType tkBitmapImageType = { + "bitmap", /* name */ + ImgBmapCreate, /* createProc */ + ImgBmapGet, /* getProc */ + ImgBmapDisplay, /* displayProc */ + ImgBmapFree, /* freeProc */ + ImgBmapDelete, /* deleteProc */ + (Tk_ImageType *) NULL /* nextPtr */ +}; + +/* + * Information used for parsing configuration specs: + */ + +static Tk_ConfigSpec configSpecs[] = { + {TK_CONFIG_UID, "-background", (char *) NULL, (char *) NULL, + "", Tk_Offset(BitmapMaster, bgUid), 0}, + {TK_CONFIG_STRING, "-data", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(BitmapMaster, dataString), TK_CONFIG_NULL_OK}, + {TK_CONFIG_STRING, "-file", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(BitmapMaster, fileString), TK_CONFIG_NULL_OK}, + {TK_CONFIG_UID, "-foreground", (char *) NULL, (char *) NULL, + "#000000", Tk_Offset(BitmapMaster, fgUid), 0}, + {TK_CONFIG_STRING, "-maskdata", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(BitmapMaster, maskDataString), + TK_CONFIG_NULL_OK}, + {TK_CONFIG_STRING, "-maskfile", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(BitmapMaster, maskFileString), + TK_CONFIG_NULL_OK}, + {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, + (char *) NULL, 0, 0} +}; + +/* + * The following data structure is used to describe the state of + * parsing a bitmap file or string. It is used for communication + * between TkGetBitmapData and NextBitmapWord. + */ + +#define MAX_WORD_LENGTH 100 +typedef struct ParseInfo { + char *string; /* Next character of string data for bitmap, + * or NULL if bitmap is being read from + * file. */ + Tcl_Channel chan; /* File containing bitmap data, or NULL + * if no file. */ + char word[MAX_WORD_LENGTH+1]; + /* Current word of bitmap data, NULL + * terminated. */ + int wordLength; /* Number of non-NULL bytes in word. */ +} ParseInfo; + +/* + * Prototypes for procedures used only locally in this file: + */ + +static int ImgBmapCmd _ANSI_ARGS_((ClientData clientData, + Tcl_Interp *interp, int argc, char **argv)); +static void ImgBmapCmdDeletedProc _ANSI_ARGS_(( + ClientData clientData)); +static void ImgBmapConfigureInstance _ANSI_ARGS_(( + BitmapInstance *instancePtr)); +static int ImgBmapConfigureMaster _ANSI_ARGS_(( + BitmapMaster *masterPtr, int argc, char **argv, + int flags)); +static int NextBitmapWord _ANSI_ARGS_((ParseInfo *parseInfoPtr)); + +/* + *---------------------------------------------------------------------- + * + * ImgBmapCreate -- + * + * This procedure is called by the Tk image code to create "test" + * images. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * The data structure for a new image is allocated. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +ImgBmapCreate(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. */ +{ + BitmapMaster *masterPtr; + + masterPtr = (BitmapMaster *) ckalloc(sizeof(BitmapMaster)); + masterPtr->tkMaster = master; + masterPtr->interp = interp; + masterPtr->imageCmd = Tcl_CreateCommand(interp, name, ImgBmapCmd, + (ClientData) masterPtr, ImgBmapCmdDeletedProc); + masterPtr->width = masterPtr->height = 0; + masterPtr->data = NULL; + masterPtr->maskData = NULL; + masterPtr->fgUid = NULL; + masterPtr->bgUid = NULL; + masterPtr->fileString = NULL; + masterPtr->dataString = NULL; + masterPtr->maskFileString = NULL; + masterPtr->maskDataString = NULL; + masterPtr->instancePtr = NULL; + if (ImgBmapConfigureMaster(masterPtr, argc, argv, 0) != TCL_OK) { + ImgBmapDelete((ClientData) masterPtr); + return TCL_ERROR; + } + *clientDataPtr = (ClientData) masterPtr; + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapConfigureMaster -- + * + * This procedure is called when a bitmap image is created or + * reconfigured. It process 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 +ImgBmapConfigureMaster(masterPtr, argc, argv, flags) + BitmapMaster *masterPtr; /* Pointer to data structure describing + * overall bitmap image to (reconfigure). */ + 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. */ +{ + BitmapInstance *instancePtr; + int maskWidth, maskHeight, dummy1, dummy2; + + if (Tk_ConfigureWidget(masterPtr->interp, Tk_MainWindow(masterPtr->interp), + configSpecs, argc, argv, (char *) masterPtr, flags) + != TCL_OK) { + return TCL_ERROR; + } + + /* + * Parse the bitmap and/or mask to create binary data. Make sure that + * the bitmap and mask have the same dimensions. + */ + + if (masterPtr->data != NULL) { + ckfree(masterPtr->data); + masterPtr->data = NULL; + } + if ((masterPtr->fileString != NULL) || (masterPtr->dataString != NULL)) { + masterPtr->data = TkGetBitmapData(masterPtr->interp, + masterPtr->dataString, masterPtr->fileString, + &masterPtr->width, &masterPtr->height, &dummy1, &dummy2); + if (masterPtr->data == NULL) { + return TCL_ERROR; + } + } + if (masterPtr->maskData != NULL) { + ckfree(masterPtr->maskData); + masterPtr->maskData = NULL; + } + if ((masterPtr->maskFileString != NULL) + || (masterPtr->maskDataString != NULL)) { + if (masterPtr->data == NULL) { + masterPtr->interp->result = "can't have mask without bitmap"; + return TCL_ERROR; + } + masterPtr->maskData = TkGetBitmapData(masterPtr->interp, + masterPtr->maskDataString, masterPtr->maskFileString, + &maskWidth, &maskHeight, &dummy1, &dummy2); + if (masterPtr->maskData == NULL) { + return TCL_ERROR; + } + if ((maskWidth != masterPtr->width) + || (maskHeight != masterPtr->height)) { + ckfree(masterPtr->maskData); + masterPtr->maskData = NULL; + masterPtr->interp->result = "bitmap and mask have different sizes"; + return TCL_ERROR; + } + } + + /* + * 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) { + ImgBmapConfigureInstance(instancePtr); + } + Tk_ImageChanged(masterPtr->tkMaster, 0, 0, masterPtr->width, + masterPtr->height, masterPtr->width, masterPtr->height); + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapConfigureInstance -- + * + * This procedure is called to create displaying information for + * a bitmap 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 +ImgBmapConfigureInstance(instancePtr) + BitmapInstance *instancePtr; /* Instance to reconfigure. */ +{ + BitmapMaster *masterPtr = instancePtr->masterPtr; + XColor *colorPtr; + XGCValues gcValues; + GC gc; + unsigned int mask; + + /* + * For each of the options in masterPtr, translate the string + * form into an internal form appropriate for instancePtr. + */ + + if (*masterPtr->bgUid != 0) { + colorPtr = Tk_GetColor(masterPtr->interp, instancePtr->tkwin, + masterPtr->bgUid); + if (colorPtr == NULL) { + goto error; + } + } else { + colorPtr = NULL; + } + if (instancePtr->bg != NULL) { + Tk_FreeColor(instancePtr->bg); + } + instancePtr->bg = colorPtr; + + colorPtr = Tk_GetColor(masterPtr->interp, instancePtr->tkwin, + masterPtr->fgUid); + if (colorPtr == NULL) { + goto error; + } + if (instancePtr->fg != NULL) { + Tk_FreeColor(instancePtr->fg); + } + instancePtr->fg = colorPtr; + + if (instancePtr->bitmap != None) { + Tk_FreePixmap(Tk_Display(instancePtr->tkwin), instancePtr->bitmap); + instancePtr->bitmap = None; + } + if (masterPtr->data != NULL) { + instancePtr->bitmap = XCreateBitmapFromData( + Tk_Display(instancePtr->tkwin), + RootWindowOfScreen(Tk_Screen(instancePtr->tkwin)), + masterPtr->data, (unsigned) masterPtr->width, + (unsigned) masterPtr->height); + } + + if (instancePtr->mask != None) { + Tk_FreePixmap(Tk_Display(instancePtr->tkwin), instancePtr->mask); + instancePtr->mask = None; + } + if (masterPtr->maskData != NULL) { + instancePtr->mask = XCreateBitmapFromData( + Tk_Display(instancePtr->tkwin), + RootWindowOfScreen(Tk_Screen(instancePtr->tkwin)), + masterPtr->maskData, (unsigned) masterPtr->width, + (unsigned) masterPtr->height); + } + + if (masterPtr->data != NULL) { + gcValues.foreground = instancePtr->fg->pixel; + gcValues.graphics_exposures = False; + mask = GCForeground|GCGraphicsExposures; + if (instancePtr->bg != NULL) { + gcValues.background = instancePtr->bg->pixel; + mask |= GCBackground; + if (instancePtr->mask != None) { + gcValues.clip_mask = instancePtr->mask; + mask |= GCClipMask; + } + } else { + gcValues.clip_mask = instancePtr->bitmap; + mask |= GCClipMask; + } + gc = Tk_GetGC(instancePtr->tkwin, mask, &gcValues); + } else { + gc = None; + } + if (instancePtr->gc != None) { + Tk_FreeGC(Tk_Display(instancePtr->tkwin), instancePtr->gc); + } + instancePtr->gc = gc; + return; + + error: + /* + * An error occurred: clear the graphics context in the instance to + * make it clear that this instance cannot be displayed. Then report + * the error. + */ + + if (instancePtr->gc != None) { + Tk_FreeGC(Tk_Display(instancePtr->tkwin), instancePtr->gc); + } + instancePtr->gc = None; + Tcl_AddErrorInfo(masterPtr->interp, "\n (while configuring image \""); + Tcl_AddErrorInfo(masterPtr->interp, Tk_NameOfImage(masterPtr->tkMaster)); + Tcl_AddErrorInfo(masterPtr->interp, "\")"); + Tcl_BackgroundError(masterPtr->interp); +} + +/* + *---------------------------------------------------------------------- + * + * TkGetBitmapData -- + * + * Given a file name or ASCII string, this procedure parses the + * file or string contents to produce binary data for a bitmap. + * + * Results: + * If the bitmap description was parsed successfully then the + * return value is a malloc-ed array containing the bitmap data. + * The dimensions of the data are stored in *widthPtr and + * *heightPtr. *hotXPtr and *hotYPtr are set to the bitmap + * hotspot if one is defined, otherwise they are set to -1, -1. + * If an error occurred, NULL is returned and an error message is + * left in interp->result. + * + * Side effects: + * A bitmap is created. + * + *---------------------------------------------------------------------- + */ + +char * +TkGetBitmapData(interp, string, fileName, widthPtr, heightPtr, + hotXPtr, hotYPtr) + Tcl_Interp *interp; /* For reporting errors. */ + char *string; /* String describing bitmap. May + * be NULL. */ + char *fileName; /* Name of file containing bitmap + * description. Used only if string + * is NULL. Must not be NULL if + * string is NULL. */ + int *widthPtr, *heightPtr; /* Dimensions of bitmap get returned + * here. */ + int *hotXPtr, *hotYPtr; /* Position of hot spot or -1,-1. */ +{ + int width, height, numBytes, hotX, hotY; + char *p, *end, *expandedFileName; + ParseInfo pi; + char *data = NULL; + Tcl_DString buffer; + + pi.string = string; + if (string == NULL) { + if (Tcl_IsSafe(interp)) { + Tcl_AppendResult(interp, "can't get bitmap data from a file in a", + " safe interpreter", (char *) NULL); + return NULL; + } + expandedFileName = Tcl_TranslateFileName(interp, fileName, &buffer); + if (expandedFileName == NULL) { + return NULL; + } + pi.chan = Tcl_OpenFileChannel(interp, expandedFileName, "r", 0); + Tcl_DStringFree(&buffer); + if (pi.chan == NULL) { + Tcl_ResetResult(interp); + Tcl_AppendResult(interp, "couldn't read bitmap file \"", + fileName, "\": ", Tcl_PosixError(interp), (char *) NULL); + return NULL; + } + } else { + pi.chan = NULL; + } + + /* + * Parse the lines that define the dimensions of the bitmap, + * plus the first line that defines the bitmap data (it declares + * the name of a data variable but doesn't include any actual + * data). These lines look something like the following: + * + * #define foo_width 16 + * #define foo_height 16 + * #define foo_x_hot 3 + * #define foo_y_hot 3 + * static char foo_bits[] = { + * + * The x_hot and y_hot lines may or may not be present. It's + * important to check for "char" in the last line, in order to + * reject old X10-style bitmaps that used shorts. + */ + + width = 0; + height = 0; + hotX = -1; + hotY = -1; + while (1) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + if ((pi.wordLength >= 6) && (pi.word[pi.wordLength-6] == '_') + && (strcmp(pi.word+pi.wordLength-6, "_width") == 0)) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + width = strtol(pi.word, &end, 0); + if ((end == pi.word) || (*end != 0)) { + goto error; + } + } else if ((pi.wordLength >= 7) && (pi.word[pi.wordLength-7] == '_') + && (strcmp(pi.word+pi.wordLength-7, "_height") == 0)) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + height = strtol(pi.word, &end, 0); + if ((end == pi.word) || (*end != 0)) { + goto error; + } + } else if ((pi.wordLength >= 6) && (pi.word[pi.wordLength-6] == '_') + && (strcmp(pi.word+pi.wordLength-6, "_x_hot") == 0)) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + hotX = strtol(pi.word, &end, 0); + if ((end == pi.word) || (*end != 0)) { + goto error; + } + } else if ((pi.wordLength >= 6) && (pi.word[pi.wordLength-6] == '_') + && (strcmp(pi.word+pi.wordLength-6, "_y_hot") == 0)) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + hotY = strtol(pi.word, &end, 0); + if ((end == pi.word) || (*end != 0)) { + goto error; + } + } else if ((pi.word[0] == 'c') && (strcmp(pi.word, "char") == 0)) { + while (1) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + if ((pi.word[0] == '{') && (pi.word[1] == 0)) { + goto getData; + } + } + } else if ((pi.word[0] == '{') && (pi.word[1] == 0)) { + Tcl_AppendResult(interp, "format error in bitmap data; ", + "looks like it's an obsolete X10 bitmap file", + (char *) NULL); + goto errorCleanup; + } + } + + /* + * Now we've read everything but the data. Allocate an array + * and read in the data. + */ + + getData: + if ((width <= 0) || (height <= 0)) { + goto error; + } + numBytes = ((width+7)/8) * height; + data = (char *) ckalloc((unsigned) numBytes); + for (p = data; numBytes > 0; p++, numBytes--) { + if (NextBitmapWord(&pi) != TCL_OK) { + goto error; + } + *p = (char) strtol(pi.word, &end, 0); + if (end == pi.word) { + goto error; + } + } + + /* + * All done. Clean up and return. + */ + + if (pi.chan != NULL) { + Tcl_Close(NULL, pi.chan); + } + *widthPtr = width; + *heightPtr = height; + *hotXPtr = hotX; + *hotYPtr = hotY; + return data; + + error: + interp->result = "format error in bitmap data"; + errorCleanup: + if (data != NULL) { + ckfree(data); + } + if (pi.chan != NULL) { + Tcl_Close(NULL, pi.chan); + } + return NULL; +} + +/* + *---------------------------------------------------------------------- + * + * NextBitmapWord -- + * + * This procedure retrieves the next word of information (stuff + * between commas or white space) from a bitmap description. + * + * Results: + * Returns TCL_OK if all went well. In this case the next word, + * and its length, will be availble in *parseInfoPtr. If the end + * of the bitmap description was reached then TCL_ERROR is returned. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +NextBitmapWord(parseInfoPtr) + ParseInfo *parseInfoPtr; /* Describes what we're reading + * and where we are in it. */ +{ + char *src, *dst; + int c; + + parseInfoPtr->wordLength = 0; + dst = parseInfoPtr->word; + if (parseInfoPtr->string != NULL) { + for (src = parseInfoPtr->string; isspace(UCHAR(*src)) || (*src == ','); + src++) { + if (*src == 0) { + return TCL_ERROR; + } + } + for ( ; !isspace(UCHAR(*src)) && (*src != ',') && (*src != 0); src++) { + *dst = *src; + dst++; + parseInfoPtr->wordLength++; + if (parseInfoPtr->wordLength > MAX_WORD_LENGTH) { + return TCL_ERROR; + } + } + parseInfoPtr->string = src; + } else { + for (c = GetByte(parseInfoPtr->chan); isspace(UCHAR(c)) || (c == ','); + c = GetByte(parseInfoPtr->chan)) { + if (c == EOF) { + return TCL_ERROR; + } + } + for ( ; !isspace(UCHAR(c)) && (c != ',') && (c != EOF); + c = GetByte(parseInfoPtr->chan)) { + *dst = c; + dst++; + parseInfoPtr->wordLength++; + if (parseInfoPtr->wordLength > MAX_WORD_LENGTH) { + return TCL_ERROR; + } + } + } + if (parseInfoPtr->wordLength == 0) { + return TCL_ERROR; + } + parseInfoPtr->word[parseInfoPtr->wordLength] = 0; + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * ImgBmapCmd -- + * + * This procedure is invoked to process the Tcl command + * that corresponds to an image managed by this module. + * See the user documentation for details on what it does. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * See the user documentation. + * + *-------------------------------------------------------------- + */ + +static int +ImgBmapCmd(clientData, interp, argc, argv) + ClientData clientData; /* Information about the image master. */ + Tcl_Interp *interp; /* Current interpreter. */ + int argc; /* Number of arguments. */ + char **argv; /* Argument strings. */ +{ + BitmapMaster *masterPtr = (BitmapMaster *) clientData; + int c, code; + size_t length; + + if (argc < 2) { + sprintf(interp->result, + "wrong # args: should be \"%.50s option ?arg arg ...?\"", + argv[0]); + return TCL_ERROR; + } + c = argv[1][0]; + length = strlen(argv[1]); + if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0) + && (length >= 2)) { + if (argc != 3) { + Tcl_AppendResult(interp, "wrong # args: should be \"", + argv[0], " cget option\"", + (char *) NULL); + return TCL_ERROR; + } + return Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs, + (char *) masterPtr, argv[2], 0); + } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0) + && (length >= 2)) { + if (argc == 2) { + code = Tk_ConfigureInfo(interp, Tk_MainWindow(interp), + configSpecs, (char *) masterPtr, (char *) NULL, 0); + } else if (argc == 3) { + code = Tk_ConfigureInfo(interp, Tk_MainWindow(interp), + configSpecs, (char *) masterPtr, argv[2], 0); + } else { + code = ImgBmapConfigureMaster(masterPtr, argc-2, argv+2, + TK_CONFIG_ARGV_ONLY); + } + return code; + } else { + Tcl_AppendResult(interp, "bad option \"", argv[1], + "\": must be cget or configure", (char *) NULL); + return TCL_ERROR; + } +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapGet -- + * + * This procedure is called for each use of a bitmap image in a + * widget. + * + * Results: + * The return value is a token for the instance, which is passed + * back to us in calls to ImgBmapDisplay and ImgBmapFree. + * + * Side effects: + * A data structure is set up for the instance (or, an existing + * instance is re-used for the new one). + * + *---------------------------------------------------------------------- + */ + +static ClientData +ImgBmapGet(tkwin, masterData) + Tk_Window tkwin; /* Window in which the instance will be + * used. */ + ClientData masterData; /* Pointer to our master structure for the + * image. */ +{ + BitmapMaster *masterPtr = (BitmapMaster *) masterData; + BitmapInstance *instancePtr; + + /* + * See if there is already an instance for this window. If so + * then just re-use it. + */ + + for (instancePtr = masterPtr->instancePtr; instancePtr != NULL; + instancePtr = instancePtr->nextPtr) { + if (instancePtr->tkwin == tkwin) { + instancePtr->refCount++; + return (ClientData) instancePtr; + } + } + + /* + * The image isn't already in use in this window. Make a new + * instance of the image. + */ + + instancePtr = (BitmapInstance *) ckalloc(sizeof(BitmapInstance)); + instancePtr->refCount = 1; + instancePtr->masterPtr = masterPtr; + instancePtr->tkwin = tkwin; + instancePtr->fg = NULL; + instancePtr->bg = NULL; + instancePtr->bitmap = None; + instancePtr->mask = None; + instancePtr->gc = None; + instancePtr->nextPtr = masterPtr->instancePtr; + masterPtr->instancePtr = instancePtr; + ImgBmapConfigureInstance(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); + } + + return (ClientData) instancePtr; +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapDisplay -- + * + * This procedure is invoked to draw a bitmap image. + * + * Results: + * None. + * + * Side effects: + * A portion of the image gets rendered in a pixmap or window. + * + *---------------------------------------------------------------------- + */ + +static void +ImgBmapDisplay(clientData, display, drawable, imageX, imageY, width, + height, drawableX, drawableY) + ClientData clientData; /* Pointer to BitmapInstance 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. */ +{ + BitmapInstance *instancePtr = (BitmapInstance *) clientData; + int masking; + + /* + * If there's no graphics context, it means that an error occurred + * while creating the image instance so it can't be displayed. + */ + + if (instancePtr->gc == None) { + return; + } + + /* + * If masking is in effect, must modify the mask origin within + * the graphics context to line up with the image's origin. + * Then draw the image and reset the clip origin, if there's + * a mask. + */ + + masking = (instancePtr->mask != None) || (instancePtr->bg == NULL); + if (masking) { + XSetClipOrigin(display, instancePtr->gc, drawableX - imageX, + drawableY - imageY); + } + XCopyPlane(display, instancePtr->bitmap, drawable, instancePtr->gc, + imageX, imageY, (unsigned) width, (unsigned) height, + drawableX, drawableY, 1); + if (masking) { + XSetClipOrigin(display, instancePtr->gc, 0, 0); + } +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapFree -- + * + * This procedure is called when a widget ceases to use a + * particular instance of an image. + * + * Results: + * None. + * + * Side effects: + * Internal data structures get cleaned up. + * + *---------------------------------------------------------------------- + */ + +static void +ImgBmapFree(clientData, display) + ClientData clientData; /* Pointer to BitmapInstance structure for + * for instance to be displayed. */ + Display *display; /* Display containing window that used image. */ +{ + BitmapInstance *instancePtr = (BitmapInstance *) clientData; + BitmapInstance *prevPtr; + + instancePtr->refCount--; + if (instancePtr->refCount > 0) { + return; + } + + /* + * There are no more uses of the image within this widget. Free + * the instance structure. + */ + + if (instancePtr->fg != NULL) { + Tk_FreeColor(instancePtr->fg); + } + if (instancePtr->bg != NULL) { + Tk_FreeColor(instancePtr->bg); + } + if (instancePtr->bitmap != None) { + Tk_FreePixmap(display, instancePtr->bitmap); + } + if (instancePtr->mask != None) { + Tk_FreePixmap(display, instancePtr->mask); + } + if (instancePtr->gc != None) { + Tk_FreeGC(display, instancePtr->gc); + } + 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; + } + ckfree((char *) instancePtr); +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapDelete -- + * + * 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 +ImgBmapDelete(masterData) + ClientData masterData; /* Pointer to BitmapMaster structure for + * image. Must not have any more instances. */ +{ + BitmapMaster *masterPtr = (BitmapMaster *) masterData; + + if (masterPtr->instancePtr != NULL) { + panic("tried to delete bitmap image when instances still exist"); + } + masterPtr->tkMaster = NULL; + if (masterPtr->imageCmd != NULL) { + Tcl_DeleteCommandFromToken(masterPtr->interp, masterPtr->imageCmd); + } + if (masterPtr->data != NULL) { + ckfree(masterPtr->data); + } + if (masterPtr->maskData != NULL) { + ckfree(masterPtr->maskData); + } + Tk_FreeOptions(configSpecs, (char *) masterPtr, (Display *) NULL, 0); + ckfree((char *) masterPtr); +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapCmdDeletedProc -- + * + * 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 +ImgBmapCmdDeletedProc(clientData) + ClientData clientData; /* Pointer to BitmapMaster structure for + * image. */ +{ + BitmapMaster *masterPtr = (BitmapMaster *) clientData; + + masterPtr->imageCmd = NULL; + if (masterPtr->tkMaster != NULL) { + Tk_DeleteImage(masterPtr->interp, Tk_NameOfImage(masterPtr->tkMaster)); + } +} + +/* + *---------------------------------------------------------------------- + * + * GetByte -- + * + * Get the next byte from the open channel. + * + * Results: + * The next byte or EOF. + * + * Side effects: + * We read from the channel. + * + *---------------------------------------------------------------------- + */ + +static int +GetByte(chan) + Tcl_Channel chan; /* The channel we read from. */ +{ + char buffer; + int size; + + size = Tcl_Read(chan, &buffer, 1); + if (size <= 0) { + return EOF; + } else { + return buffer; + } +} |