diff options
Diffstat (limited to 'tk8.6/generic/tkImgBmap.c')
| -rw-r--r-- | tk8.6/generic/tkImgBmap.c | 1323 |
1 files changed, 1323 insertions, 0 deletions
diff --git a/tk8.6/generic/tkImgBmap.c b/tk8.6/generic/tkImgBmap.c new file mode 100644 index 0000000..f4ee407 --- /dev/null +++ b/tk8.6/generic/tkImgBmap.c @@ -0,0 +1,1323 @@ +/* + * 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. + * Copyright (c) 1999 by Scriptics Corporation. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#include "tkInt.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(Tcl_Channel chan); +static int ImgBmapCreate(Tcl_Interp *interp, + const char *name, int argc, Tcl_Obj *const objv[], + const Tk_ImageType *typePtr, Tk_ImageMaster master, + ClientData *clientDataPtr); +static ClientData ImgBmapGet(Tk_Window tkwin, ClientData clientData); +static void ImgBmapDisplay(ClientData clientData, + Display *display, Drawable drawable, + int imageX, int imageY, int width, int height, + int drawableX, int drawableY); +static void ImgBmapFree(ClientData clientData, Display *display); +static void ImgBmapDelete(ClientData clientData); +static int ImgBmapPostscript(ClientData clientData, + Tcl_Interp *interp, Tk_Window tkwin, + Tk_PostscriptInfo psinfo, int x, int y, + int width, int height, int prepass); + +Tk_ImageType tkBitmapImageType = { + "bitmap", /* name */ + ImgBmapCreate, /* createProc */ + ImgBmapGet, /* getProc */ + ImgBmapDisplay, /* displayProc */ + ImgBmapFree, /* freeProc */ + ImgBmapDelete, /* deleteProc */ + ImgBmapPostscript, /* postscriptProc */ + NULL, /* nextPtr */ + NULL +}; + +/* + * Information used for parsing configuration specs: + */ + +static const Tk_ConfigSpec configSpecs[] = { + {TK_CONFIG_UID, "-background", NULL, NULL, + "", Tk_Offset(BitmapMaster, bgUid), 0, NULL}, + {TK_CONFIG_STRING, "-data", NULL, NULL, + NULL, Tk_Offset(BitmapMaster, dataString), TK_CONFIG_NULL_OK, NULL}, + {TK_CONFIG_STRING, "-file", NULL, NULL, + NULL, Tk_Offset(BitmapMaster, fileString), TK_CONFIG_NULL_OK, NULL}, + {TK_CONFIG_UID, "-foreground", NULL, NULL, + "#000000", Tk_Offset(BitmapMaster, fgUid), 0, NULL}, + {TK_CONFIG_STRING, "-maskdata", NULL, NULL, + NULL, Tk_Offset(BitmapMaster, maskDataString), TK_CONFIG_NULL_OK, NULL}, + {TK_CONFIG_STRING, "-maskfile", NULL, NULL, + NULL, Tk_Offset(BitmapMaster, maskFileString), TK_CONFIG_NULL_OK, NULL}, + {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL} +}; + +/* + * 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 { + const 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(ClientData clientData, Tcl_Interp *interp, + int argc, Tcl_Obj *const objv[]); +static void ImgBmapCmdDeletedProc(ClientData clientData); +static void ImgBmapConfigureInstance(BitmapInstance *instancePtr); +static int ImgBmapConfigureMaster(BitmapMaster *masterPtr, + int argc, Tcl_Obj *const objv[], int flags); +static int NextBitmapWord(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( + Tcl_Interp *interp, /* Interpreter for application containing + * image. */ + const char *name, /* Name to use for image. */ + int argc, /* Number of arguments. */ + Tcl_Obj *const argv[], /* Argument objects for options (doesn't + * include image name or type). */ + const 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 = ckalloc(sizeof(BitmapMaster)); + + masterPtr->tkMaster = master; + masterPtr->interp = interp; + masterPtr->imageCmd = Tcl_CreateObjCommand(interp, name, ImgBmapCmd, + 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(masterPtr); + return TCL_ERROR; + } + *clientDataPtr = 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 the masterPtr->interp's result. + * + * Side effects: + * Existing instances of the image will be redisplayed to match the new + * configuration options. + * + *---------------------------------------------------------------------- + */ + +static int +ImgBmapConfigureMaster( + BitmapMaster *masterPtr, /* Pointer to data structure describing + * overall bitmap image to (reconfigure). */ + int objc, /* Number of entries in objv. */ + Tcl_Obj *const objv[], /* 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; + const char **argv = ckalloc((objc+1) * sizeof(char *)); + + for (dummy1 = 0; dummy1 < objc; dummy1++) { + argv[dummy1] = Tcl_GetString(objv[dummy1]); + } + argv[objc] = NULL; + + if (Tk_ConfigureWidget(masterPtr->interp, Tk_MainWindow(masterPtr->interp), + configSpecs, objc, argv, (char *) masterPtr, flags) != TCL_OK) { + ckfree(argv); + return TCL_ERROR; + } + ckfree(argv); + + /* + * 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) { + Tcl_SetObjResult(masterPtr->interp, Tcl_NewStringObj( + "can't have mask without bitmap", -1)); + Tcl_SetErrorCode(masterPtr->interp, "TK", "IMAGE", "BITMAP", + "NO_BITMAP", NULL); + 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; + Tcl_SetObjResult(masterPtr->interp, Tcl_NewStringObj( + "bitmap and mask have different sizes", -1)); + Tcl_SetErrorCode(masterPtr->interp, "TK", "IMAGE", "BITMAP", + "MASK_SIZE", NULL); + 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_BackgroundException if there are problems in + * setting up the instance. + * + *---------------------------------------------------------------------- + */ + +static void +ImgBmapConfigureInstance( + BitmapInstance *instancePtr)/* Instance to reconfigure. */ +{ + BitmapMaster *masterPtr = instancePtr->masterPtr; + XColor *colorPtr; + XGCValues gcValues; + GC gc; + unsigned int mask; + Pixmap oldBitmap, oldMask; + + /* + * 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; + + /* + * Careful: We have to allocate new Pixmaps before deleting the old ones. + * Otherwise, The XID allocator will always return the same XID for the + * new Pixmaps as was used for the old Pixmaps. And that will prevent the + * data and/or mask from changing in the GC below. + */ + + oldBitmap = instancePtr->bitmap; + instancePtr->bitmap = None; + oldMask = instancePtr->mask; + instancePtr->mask = 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 (masterPtr->maskData != NULL) { + instancePtr->mask = XCreateBitmapFromData( + Tk_Display(instancePtr->tkwin), + RootWindowOfScreen(Tk_Screen(instancePtr->tkwin)), + masterPtr->maskData, (unsigned) masterPtr->width, + (unsigned) masterPtr->height); + } + + if (oldMask != None) { + Tk_FreePixmap(Tk_Display(instancePtr->tkwin), oldMask); + } + if (oldBitmap != None) { + Tk_FreePixmap(Tk_Display(instancePtr->tkwin), oldBitmap); + } + + 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 = NULL; + } + if (instancePtr->gc != NULL) { + 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 != NULL) { + Tk_FreeGC(Tk_Display(instancePtr->tkwin), instancePtr->gc); + } + instancePtr->gc = NULL; + Tcl_AppendObjToErrorInfo(masterPtr->interp, Tcl_ObjPrintf( + "\n (while configuring image \"%s\")", Tk_NameOfImage( + masterPtr->tkMaster))); + Tcl_BackgroundException(masterPtr->interp, TCL_ERROR); +} + +/* + *---------------------------------------------------------------------- + * + * 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 the interp's result. + * + * Side effects: + * A bitmap is created. + * + *---------------------------------------------------------------------- + */ + +char * +TkGetBitmapData( + Tcl_Interp *interp, /* For reporting errors, or NULL. */ + const char *string, /* String describing bitmap. May be NULL. */ + const char *fileName, /* Name of file containing bitmap description. + * Used only if string is NULL. Must not be + * NULL if string is NULL. */ + int *widthPtr, int *heightPtr, + /* Dimensions of bitmap get returned here. */ + int *hotXPtr, int *hotYPtr) /* Position of hot spot or -1,-1. */ +{ + int width, height, numBytes, hotX, hotY; + const char *expandedFileName; + char *p, *end; + ParseInfo pi; + char *data = NULL; + Tcl_DString buffer; + + pi.string = string; + if (string == NULL) { + if ((interp != NULL) && Tcl_IsSafe(interp)) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "can't get bitmap data from a file in a safe interpreter", + -1)); + Tcl_SetErrorCode(interp, "TK", "SAFE", "BITMAP_FILE", 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) { + if (interp != NULL) { + Tcl_ResetResult(interp); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "couldn't read bitmap file \"%s\": %s", + fileName, Tcl_PosixError(interp))); + } + return NULL; + } + + if (Tcl_SetChannelOption(interp, pi.chan, "-translation", "binary") + != TCL_OK) { + return NULL; + } + if (Tcl_SetChannelOption(interp, pi.chan, "-encoding", "binary") + != TCL_OK) { + 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)) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "format error in bitmap data; looks like it's an" + " obsolete X10 bitmap file", -1)); + Tcl_SetErrorCode(interp, "TK", "IMAGE", "BITMAP", "OBSOLETE", + 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 = ckalloc(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: + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "format error in bitmap data", -1)); + Tcl_SetErrorCode(interp, "TK", "IMAGE", "BITMAP", "FORMAT", NULL); + } + + 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( + ParseInfo *parseInfoPtr) /* Describes what we're reading and where we + * are in it. */ +{ + const char *src; + char *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 clientData, /* Information about the image master. */ + Tcl_Interp *interp, /* Current interpreter. */ + int objc, /* Number of arguments. */ + Tcl_Obj *const objv[]) /* Argument objects. */ +{ + static const char *const bmapOptions[] = {"cget", "configure", NULL}; + BitmapMaster *masterPtr = clientData; + int index; + + if (objc < 2) { + Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?"); + return TCL_ERROR; + } + if (Tcl_GetIndexFromObjStruct(interp, objv[1], bmapOptions, + sizeof(char *), "option", 0, &index) != TCL_OK) { + return TCL_ERROR; + } + switch (index) { + case 0: /* cget */ + if (objc != 3) { + Tcl_WrongNumArgs(interp, 2, objv, "option"); + return TCL_ERROR; + } + return Tk_ConfigureValue(interp, Tk_MainWindow(interp), configSpecs, + (char *) masterPtr, Tcl_GetString(objv[2]), 0); + case 1: /* configure */ + if (objc == 2) { + return Tk_ConfigureInfo(interp, Tk_MainWindow(interp), + configSpecs, (char *) masterPtr, NULL, 0); + } else if (objc == 3) { + return Tk_ConfigureInfo(interp, Tk_MainWindow(interp), + configSpecs, (char *) masterPtr, + Tcl_GetString(objv[2]), 0); + } else { + return ImgBmapConfigureMaster(masterPtr, objc-2, objv+2, + TK_CONFIG_ARGV_ONLY); + } + default: + Tcl_Panic("bad const entries to bmapOptions in ImgBmapCmd"); + return TCL_OK; + } +} + +/* + *---------------------------------------------------------------------- + * + * 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( + Tk_Window tkwin, /* Window in which the instance will be + * used. */ + ClientData masterData) /* Pointer to our master structure for the + * image. */ +{ + BitmapMaster *masterPtr = 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 instancePtr; + } + } + + /* + * The image isn't already in use in this window. Make a new instance of + * the image. + */ + + instancePtr = 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 = NULL; + 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 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 clientData, /* Pointer to BitmapInstance structure 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, int imageY, /* Upper-left corner of region within image to + * draw. */ + int width, int height, /* Dimensions of region within image to draw. */ + int drawableX, int drawableY) + /* Coordinates within drawable that correspond + * to imageX and imageY. */ +{ + BitmapInstance *instancePtr = 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 == NULL) { + 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 clientData, /* Pointer to BitmapInstance structure for + * instance to be displayed. */ + Display *display) /* Display containing window that used image. */ +{ + BitmapInstance *instancePtr = 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 != NULL) { + 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(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( + ClientData masterData) /* Pointer to BitmapMaster structure for + * image. Must not have any more instances. */ +{ + BitmapMaster *masterPtr = masterData; + + if (masterPtr->instancePtr != NULL) { + Tcl_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, NULL, 0); + ckfree(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) /* Pointer to BitmapMaster structure for + * image. */ +{ + BitmapMaster *masterPtr = 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( + 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; + } +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapPsImagemask -- + * + * This procedure generates postscript suitable for rendering a single + * bitmap of an image. A single bitmap image might contain both a + * foreground and a background bitmap. This routine is called once for + * each such bitmap in a bitmap image. + * + * Prior to invoking this routine, the following setup has occurred: + * + * 1. The postscript foreground color has been set to the color used + * to render the bitmap. + * + * 2. The origin of the postscript coordinate system is set to the + * lower left corner of the bitmap. + * + * 3. The postscript coordinate system has been scaled so that the + * entire bitmap is one unit squared. + * + * Results: + * None. + * + * Side effects: + * Postscript code is appended to psObj. + * + *---------------------------------------------------------------------- + */ + +static void +ImgBmapPsImagemask( + Tcl_Obj *psObj, /* Append postscript to this buffer. */ + int width, int height, /* Width and height of the bitmap in pixels */ + char *data) /* Data for the bitmap. */ +{ + int i, j, nBytePerRow; + + /* + * The bit order of bitmaps in Tk is the opposite of the bit order that + * postscript uses. (In Tk, the least significant bit is on the right side + * of the bitmap and in postscript the least significant bit is shown on + * the left.) The following array is used to reverse the order of bits + * within a byte so that the bits will be in the order postscript expects. + */ + + static const unsigned char bit_reverse[] = { + 0, 128, 64, 192, 32, 160, 96, 224, 16, 144, 80, 208, 48, 176, 112, 240, + 8, 136, 72, 200, 40, 168, 104, 232, 24, 152, 88, 216, 56, 184, 120, 248, + 4, 132, 68, 196, 36, 164, 100, 228, 20, 148, 84, 212, 52, 180, 116, 244, + 12, 140, 76, 204, 44, 172, 108, 236, 28, 156, 92, 220, 60, 188, 124, 252, + 2, 130, 66, 194, 34, 162, 98, 226, 18, 146, 82, 210, 50, 178, 114, 242, + 10, 138, 74, 202, 42, 170, 106, 234, 26, 154, 90, 218, 58, 186, 122, 250, + 6, 134, 70, 198, 38, 166, 102, 230, 22, 150, 86, 214, 54, 182, 118, 246, + 14, 142, 78, 206, 46, 174, 110, 238, 30, 158, 94, 222, 62, 190, 126, 254, + 1, 129, 65, 193, 33, 161, 97, 225, 17, 145, 81, 209, 49, 177, 113, 241, + 9, 137, 73, 201, 41, 169, 105, 233, 25, 153, 89, 217, 57, 185, 121, 249, + 5, 133, 69, 197, 37, 165, 101, 229, 21, 149, 85, 213, 53, 181, 117, 245, + 13, 141, 77, 205, 45, 173, 109, 237, 29, 157, 93, 221, 61, 189, 125, 253, + 3, 131, 67, 195, 35, 163, 99, 227, 19, 147, 83, 211, 51, 179, 115, 243, + 11, 139, 75, 203, 43, 171, 107, 235, 27, 155, 91, 219, 59, 187, 123, 251, + 7, 135, 71, 199, 39, 167, 103, 231, 23, 151, 87, 215, 55, 183, 119, 247, + 15, 143, 79, 207, 47, 175, 111, 239, 31, 159, 95, 223, 63, 191, 127, 255, + }; + + Tcl_AppendPrintfToObj(psObj, + "0 0 moveto %d %d true [%d 0 0 %d 0 %d] {<\n", + width, height, width, -height, height); + + nBytePerRow = (width + 7) / 8; + for (i=0; i<height; i++) { + for (j=0; j<nBytePerRow; j++) { + Tcl_AppendPrintfToObj(psObj, " %02x", + bit_reverse[0xff & data[i*nBytePerRow + j]]); + } + Tcl_AppendToObj(psObj, "\n", -1); + } + + Tcl_AppendToObj(psObj, ">} imagemask \n", -1); +} + +/* + *---------------------------------------------------------------------- + * + * ImgBmapPostscript -- + * + * This procedure generates postscript for rendering a bitmap image. + * + * Results: + * On success, this routine writes postscript code into interp->result + * and returns TCL_OK TCL_ERROR is returned and an error message is left + * in interp->result if anything goes wrong. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static int +ImgBmapPostscript( + ClientData clientData, + Tcl_Interp *interp, + Tk_Window tkwin, + Tk_PostscriptInfo psinfo, + int x, int y, int width, int height, + int prepass) +{ + BitmapMaster *masterPtr = clientData; + Tcl_InterpState interpState; + Tcl_Obj *psObj; + + if (prepass) { + return TCL_OK; + } + + /* + * There is nothing to do for bitmaps with zero width or height. + */ + + if (width<=0 || height<=0 || masterPtr->width<=0 || masterPtr->height<=0){ + return TCL_OK; + } + + /* + * Some postscript implementations cannot handle bitmap strings longer + * than about 60k characters. If the bitmap data is that big or bigger, + * we bail out. + */ + + if (masterPtr->width*masterPtr->height > 60000) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "unable to generate postscript for bitmaps larger than 60000" + " pixels", -1)); + Tcl_SetErrorCode(interp, "TK", "CANVAS", "PS", "MEMLIMIT", NULL); + return TCL_ERROR; + } + + /* + * Make our working space. + */ + + psObj = Tcl_NewObj(); + interpState = Tcl_SaveInterpState(interp, TCL_OK); + + /* + * Translate the origin of the coordinate system to be the lower-left + * corner of the bitmap and adjust the scale of the coordinate system so + * that entire bitmap covers one square unit of the page. The calling + * function put a "gsave" into the postscript and will add a "grestore" at + * after this routine returns, so it is safe to make whatever changes are + * necessary here. + */ + + if (x != 0 || y != 0) { + Tcl_AppendPrintfToObj(psObj, "%d %d moveto\n", x, y); + } + if (width != 1 || height != 1) { + Tcl_AppendPrintfToObj(psObj, "%d %d scale\n", width, height); + } + + /* + * Color the background, if there is one. This step is skipped if the + * background is transparent. If the background is not transparent and + * there is no background mask, then color the complete rectangle that + * encloses the bitmap. If there is a background mask, then only apply + * color to the bits specified by the mask. + */ + + if ((masterPtr->bgUid != NULL) && (masterPtr->bgUid[0] != '\000')) { + XColor color; + + TkParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), masterPtr->bgUid, + &color); + Tcl_ResetResult(interp); + if (Tk_PostscriptColor(interp, psinfo, &color) != TCL_OK) { + goto error; + } + Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); + + if (masterPtr->maskData == NULL) { + Tcl_AppendToObj(psObj, + "0 0 moveto 1 0 rlineto 0 1 rlineto -1 0 rlineto " + "closepath fill\n", -1); + } else { + ImgBmapPsImagemask(psObj, masterPtr->width, masterPtr->height, + masterPtr->maskData); + } + } + + /* + * Draw the bitmap foreground, assuming there is one. + */ + + if ((masterPtr->fgUid != NULL) && (masterPtr->data != NULL)) { + XColor color; + + TkParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), masterPtr->fgUid, + &color); + Tcl_ResetResult(interp); + if (Tk_PostscriptColor(interp, psinfo, &color) != TCL_OK) { + goto error; + } + Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); + + ImgBmapPsImagemask(psObj, masterPtr->width, masterPtr->height, + masterPtr->data); + } + + /* + * Plug the accumulated postscript back into the result. + */ + + (void) Tcl_RestoreInterpState(interp, interpState); + Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj); + Tcl_DecrRefCount(psObj); + return TCL_OK; + + error: + Tcl_DiscardInterpState(interpState); + Tcl_DecrRefCount(psObj); + return TCL_ERROR; +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |