tkImgBmap.c
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- /*
- * 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.
- *
- * RCS: @(#) $Id: tkImgBmap.c,v 1.15.2.2 2006/09/22 14:53:06 dkf Exp $
- */
- #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, Tcl_Obj *CONST objv[],
- 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));
- static int ImgBmapPostscript _ANSI_ARGS_((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 */
- (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, Tcl_Obj *CONST objv[]));
- static void ImgBmapCmdDeletedProc _ANSI_ARGS_((
- ClientData clientData));
- static void ImgBmapConfigureInstance _ANSI_ARGS_((
- BitmapInstance *instancePtr));
- static int ImgBmapConfigureMaster _ANSI_ARGS_((
- BitmapMaster *masterPtr, int argc, Tcl_Obj *CONST objv[],
- 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. */
- Tcl_Obj *CONST argv[]; /* Argument objects 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_CreateObjCommand(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 the masterPtr->interp's result.
- *
- * Side effects:
- * Existing instances of the image will be redisplayed to match
- * the new configuration options.
- *
- *----------------------------------------------------------------------
- */
- static int
- ImgBmapConfigureMaster(masterPtr, objc, objv, flags)
- 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 = (CONST char **) 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((char *) argv);
- return TCL_ERROR;
- }
- ckfree((char *) 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_SetResult(masterPtr->interp, "can't have mask without bitmap",
- TCL_STATIC);
- 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_SetResult(masterPtr->interp,
- "bitmap and mask have different sizes", TCL_STATIC);
- 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;
- 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;
- oldMask = instancePtr->mask;
- instancePtr->mask = None;
- /*
- * 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 = 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 the interp's result.
- *
- * Side effects:
- * A bitmap is created.
- *
- *----------------------------------------------------------------------
- */
- char *
- TkGetBitmapData(interp, string, fileName, widthPtr, heightPtr,
- hotXPtr, hotYPtr)
- Tcl_Interp *interp; /* For reporting errors, or NULL. */
- 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;
- 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_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) {
- if (interp != NULL) {
- Tcl_ResetResult(interp);
- Tcl_AppendResult(interp, "couldn't read bitmap file "",
- fileName, "": ", Tcl_PosixError(interp),
- (char *) NULL);
- }
- 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_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:
- if (interp != NULL) {
- Tcl_SetResult(interp, "format error in bitmap data", TCL_STATIC);
- }
-
- 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, objc, objv)
- 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 *bmapOptions[] = {"cget", "configure", (char *) NULL};
- BitmapMaster *masterPtr = (BitmapMaster *) clientData;
- int code, index;
- if (objc < 2) {
- Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
- return TCL_ERROR;
- }
- if (Tcl_GetIndexFromObj(interp, objv[1], bmapOptions, "option", 0,
- &index) != TCL_OK) {
- return TCL_ERROR;
- }
- switch (index) {
- case 0: {
- 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: {
- if (objc == 2) {
- code = Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
- configSpecs, (char *) masterPtr, (char *) NULL, 0);
- } else if (objc == 3) {
- code = Tk_ConfigureInfo(interp, Tk_MainWindow(interp),
- configSpecs, (char *) masterPtr,
- Tcl_GetString(objv[2]), 0);
- } else {
- code = ImgBmapConfigureMaster(masterPtr, objc-2, objv+2,
- TK_CONFIG_ARGV_ONLY);
- }
- return code;
- }
- default: {
- 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(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;
- }
- }
- /*
- *----------------------------------------------------------------------
- *
- * 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.
- *
- * Some postscript implementations cannot handle bitmap strings
- * longer than about 60k characters. If the bitmap data is that big
- * or bigger, then we render it by splitting it into several smaller
- * bitmaps.
- *
- * Results:
- * Returns TCL_OK on success. Returns TCL_ERROR and leaves and error
- * message in interp->result if there is a problem.
- *
- * Side effects:
- * Postscript code is appended to interp->result.
- *
- *----------------------------------------------------------------------
- */
- static int
- ImgBmapPsImagemask(interp, width, height, data)
- Tcl_Interp *interp; /* Append postscript to this interpreter */
- int width, height; /* Width and height of the bitmap in pixels */
- char *data; /* Data for the bitmap */
- {
- int i, j, nBytePerRow;
- char buffer[200];
- /*
- * 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 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,
- };
- if (width*height > 60000) {
- Tcl_ResetResult(interp);
- Tcl_AppendResult(interp, "unable to generate postscript for bitmaps "
- "larger than 60000 pixels", NULL);
- return TCL_ERROR;
- }
- sprintf(buffer, "0 0 moveto %d %d true [%d 0 0 %d 0 %d] {<n",
- width, height, width, -height, height);
- Tcl_AppendResult(interp, buffer, NULL);
- nBytePerRow = (width+7)/8;
- for(i=0; i<height; i++){
- for(j=0; j<nBytePerRow; j++){
- sprintf(buffer, " %02x", bit_reverse[0xff & data[i*nBytePerRow + j]]);
- Tcl_AppendResult(interp, buffer, NULL);
- }
- Tcl_AppendResult(interp, "n", NULL);
- }
- Tcl_AppendResult(interp, ">} imagemask n", NULL);
- return TCL_OK;
- }
- /*
- *----------------------------------------------------------------------
- *
- * 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, interp, tkwin, psinfo, x, y, width, height,
- prepass)
- ClientData clientData;
- Tcl_Interp *interp;
- Tk_Window tkwin;
- Tk_PostscriptInfo psinfo;
- int x, y, width, height, prepass;
- {
- BitmapMaster *masterPtr = (BitmapMaster *) clientData;
- char buffer[200];
- 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;
- }
- /*
- * 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 ){
- sprintf(buffer, "%d %d moveton", x, y);
- Tcl_AppendResult(interp, buffer, NULL);
- }
- if( width!=1 || height!=1 ){
- sprintf(buffer, "%d %d scalen", width, height);
- Tcl_AppendResult(interp, buffer, NULL);
- }
- /*
- * 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] != ' 00')) {
- XColor color;
- XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), masterPtr->bgUid,
- &color);
- if (Tk_PostscriptColor(interp, psinfo, &color) != TCL_OK) {
- return TCL_ERROR;
- }
- if (masterPtr->maskData == NULL) {
- Tcl_AppendResult(interp,
- "0 0 moveto 1 0 rlineto 0 1 rlineto -1 0 rlineto "
- "closepath filln", NULL);
- } else if (ImgBmapPsImagemask(interp, masterPtr->width,
- masterPtr->height, masterPtr->maskData) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- /*
- * Draw the bitmap foreground, assuming there is one.
- */
- if ( (masterPtr->fgUid != NULL) && (masterPtr->data != NULL) ) {
- XColor color;
- XParseColor(Tk_Display(tkwin), Tk_Colormap(tkwin), masterPtr->fgUid,
- &color);
- if (Tk_PostscriptColor(interp, psinfo, &color) != TCL_OK) {
- return TCL_ERROR;
- }
- if (ImgBmapPsImagemask(interp, masterPtr->width, masterPtr->height,
- masterPtr->data) != TCL_OK) {
- return TCL_ERROR;
- }
- }
- return TCL_OK;
- }