tkTextImage.c
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- /*
- * tkImage.c --
- *
- * This file contains code that allows images to be
- * nested inside text widgets. It also implements the "image"
- * widget command for texts.
- *
- * Copyright (c) 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.
- *
- * RCS: @(#) $Id: tkTextImage.c,v 1.5 2002/08/05 04:30:40 dgp Exp $
- */
- #include "tk.h"
- #include "tkText.h"
- #include "tkPort.h"
- /*
- * Definitions for alignment values:
- */
- #define ALIGN_BOTTOM 0
- #define ALIGN_CENTER 1
- #define ALIGN_TOP 2
- #define ALIGN_BASELINE 3
- /*
- * Macro that determines the size of an embedded image segment:
- */
- #define EI_SEG_SIZE ((unsigned) (Tk_Offset(TkTextSegment, body)
- + sizeof(TkTextEmbImage)))
- /*
- * Prototypes for procedures defined in this file:
- */
- static int AlignParseProc _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, Tk_Window tkwin,
- CONST char *value, char *widgRec, int offset));
- static char * AlignPrintProc _ANSI_ARGS_((ClientData clientData,
- Tk_Window tkwin, char *widgRec, int offset,
- Tcl_FreeProc **freeProcPtr));
- static TkTextSegment * EmbImageCleanupProc _ANSI_ARGS_((TkTextSegment *segPtr,
- TkTextLine *linePtr));
- static void EmbImageCheckProc _ANSI_ARGS_((TkTextSegment *segPtr,
- TkTextLine *linePtr));
- static void EmbImageBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
- int index, int y, int lineHeight, int baseline,
- int *xPtr, int *yPtr, int *widthPtr,
- int *heightPtr));
- static int EmbImageConfigure _ANSI_ARGS_((TkText *textPtr,
- TkTextSegment *eiPtr, int argc, CONST char **argv));
- static int EmbImageDeleteProc _ANSI_ARGS_((TkTextSegment *segPtr,
- TkTextLine *linePtr, int treeGone));
- static void EmbImageDisplayProc _ANSI_ARGS_((
- TkTextDispChunk *chunkPtr, int x, int y,
- int lineHeight, int baseline, Display *display,
- Drawable dst, int screenY));
- static int EmbImageLayoutProc _ANSI_ARGS_((TkText *textPtr,
- TkTextIndex *indexPtr, TkTextSegment *segPtr,
- int offset, int maxX, int maxChars,
- int noCharsYet, TkWrapMode wrapMode,
- TkTextDispChunk *chunkPtr));
- static void EmbImageProc _ANSI_ARGS_((ClientData clientData,
- int x, int y, int width, int height,
- int imageWidth, int imageHeight));
- /*
- * The following structure declares the "embedded image" segment type.
- */
- static Tk_SegType tkTextEmbImageType = {
- "image", /* name */
- 0, /* leftGravity */
- (Tk_SegSplitProc *) NULL, /* splitProc */
- EmbImageDeleteProc, /* deleteProc */
- EmbImageCleanupProc, /* cleanupProc */
- (Tk_SegLineChangeProc *) NULL, /* lineChangeProc */
- EmbImageLayoutProc, /* layoutProc */
- EmbImageCheckProc /* checkProc */
- };
- /*
- * Information used for parsing image configuration options:
- */
- static Tk_CustomOption alignOption = {AlignParseProc, AlignPrintProc,
- (ClientData) NULL};
- static Tk_ConfigSpec configSpecs[] = {
- {TK_CONFIG_CUSTOM, "-align", (char *) NULL, (char *) NULL,
- "center", 0, TK_CONFIG_DONT_SET_DEFAULT, &alignOption},
- {TK_CONFIG_PIXELS, "-padx", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(TkTextEmbImage, padX),
- TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_PIXELS, "-pady", (char *) NULL, (char *) NULL,
- "0", Tk_Offset(TkTextEmbImage, padY),
- TK_CONFIG_DONT_SET_DEFAULT},
- {TK_CONFIG_STRING, "-image", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(TkTextEmbImage, imageString),
- TK_CONFIG_DONT_SET_DEFAULT|TK_CONFIG_NULL_OK},
- {TK_CONFIG_STRING, "-name", (char *) NULL, (char *) NULL,
- (char *) NULL, Tk_Offset(TkTextEmbImage, imageName),
- TK_CONFIG_DONT_SET_DEFAULT|TK_CONFIG_NULL_OK},
- {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
- (char *) NULL, 0, 0}
- };
- /*
- *--------------------------------------------------------------
- *
- * TkTextImageCmd --
- *
- * This procedure implements the "image" widget command
- * for text widgets. See the user documentation for details
- * on what it does.
- *
- * Results:
- * A standard Tcl result or error.
- *
- * Side effects:
- * See the user documentation.
- *
- *--------------------------------------------------------------
- */
- int
- TkTextImageCmd(textPtr, interp, argc, argv)
- register TkText *textPtr; /* Information about text widget. */
- Tcl_Interp *interp; /* Current interpreter. */
- int argc; /* Number of arguments. */
- CONST char **argv; /* Argument strings. Someone else has already
- * parsed this command enough to know that
- * argv[1] is "image". */
- {
- size_t length;
- register TkTextSegment *eiPtr;
- if (argc < 3) {
- Tcl_AppendResult(interp, "wrong # args: should be "",
- argv[0], " image option ?arg arg ...?"", (char *) NULL);
- return TCL_ERROR;
- }
- length = strlen(argv[2]);
- if ((strncmp(argv[2], "cget", length) == 0) && (length >= 2)) {
- TkTextIndex index;
- TkTextSegment *eiPtr;
- if (argc != 5) {
- Tcl_AppendResult(interp, "wrong # args: should be "",
- argv[0], " image cget index option"",
- (char *) NULL);
- return TCL_ERROR;
- }
- if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
- return TCL_ERROR;
- }
- eiPtr = TkTextIndexToSeg(&index, (int *) NULL);
- if (eiPtr->typePtr != &tkTextEmbImageType) {
- Tcl_AppendResult(interp, "no embedded image at index "",
- argv[3], """, (char *) NULL);
- return TCL_ERROR;
- }
- return Tk_ConfigureValue(interp, textPtr->tkwin, configSpecs,
- (char *) &eiPtr->body.ei, argv[4], 0);
- } else if ((strncmp(argv[2], "configure", length) == 0) && (length >= 2)) {
- TkTextIndex index;
- TkTextSegment *eiPtr;
- if (argc < 4) {
- Tcl_AppendResult(interp, "wrong # args: should be "",
- argv[0], " image configure index ?option value ...?"",
- (char *) NULL);
- return TCL_ERROR;
- }
- if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
- return TCL_ERROR;
- }
- eiPtr = TkTextIndexToSeg(&index, (int *) NULL);
- if (eiPtr->typePtr != &tkTextEmbImageType) {
- Tcl_AppendResult(interp, "no embedded image at index "",
- argv[3], """, (char *) NULL);
- return TCL_ERROR;
- }
- if (argc == 4) {
- return Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
- (char *) &eiPtr->body.ei, (char *) NULL, 0);
- } else if (argc == 5) {
- return Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
- (char *) &eiPtr->body.ei, argv[4], 0);
- } else {
- TkTextChanged(textPtr, &index, &index);
- return EmbImageConfigure(textPtr, eiPtr, argc-4, argv+4);
- }
- } else if ((strncmp(argv[2], "create", length) == 0) && (length >= 2)) {
- TkTextIndex index;
- int lineIndex;
- /*
- * Add a new image. Find where to put the new image, and
- * mark that position for redisplay.
- */
- if (argc < 4) {
- Tcl_AppendResult(interp, "wrong # args: should be "",
- argv[0], " image create index ?option value ...?"",
- (char *) NULL);
- return TCL_ERROR;
- }
- if (TkTextGetIndex(interp, textPtr, argv[3], &index) != TCL_OK) {
- return TCL_ERROR;
- }
- /*
- * Don't allow insertions on the last (dummy) line of the text.
- */
-
- lineIndex = TkBTreeLineIndex(index.linePtr);
- if (lineIndex == TkBTreeNumLines(textPtr->tree)) {
- lineIndex--;
- TkTextMakeByteIndex(textPtr->tree, lineIndex, 1000000, &index);
- }
- /*
- * Create the new image segment and initialize it.
- */
- eiPtr = (TkTextSegment *) ckalloc(EI_SEG_SIZE);
- eiPtr->typePtr = &tkTextEmbImageType;
- eiPtr->size = 1;
- eiPtr->body.ei.textPtr = textPtr;
- eiPtr->body.ei.linePtr = NULL;
- eiPtr->body.ei.imageName = NULL;
- eiPtr->body.ei.imageString = NULL;
- eiPtr->body.ei.name = NULL;
- eiPtr->body.ei.image = NULL;
- eiPtr->body.ei.align = ALIGN_CENTER;
- eiPtr->body.ei.padX = eiPtr->body.ei.padY = 0;
- eiPtr->body.ei.chunkCount = 0;
- /*
- * Link the segment into the text widget, then configure it (delete
- * it again if the configuration fails).
- */
- TkTextChanged(textPtr, &index, &index);
- TkBTreeLinkSegment(eiPtr, &index);
- if (EmbImageConfigure(textPtr, eiPtr, argc-4, argv+4) != TCL_OK) {
- TkTextIndex index2;
- TkTextIndexForwChars(&index, 1, &index2);
- TkBTreeDeleteChars(&index, &index2);
- return TCL_ERROR;
- }
- } else if (strncmp(argv[2], "names", length) == 0) {
- Tcl_HashSearch search;
- Tcl_HashEntry *hPtr;
- if (argc != 3) {
- Tcl_AppendResult(interp, "wrong # args: should be "",
- argv[0], " image names"", (char *) NULL);
- return TCL_ERROR;
- }
- for (hPtr = Tcl_FirstHashEntry(&textPtr->imageTable, &search);
- hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
- Tcl_AppendElement(interp,
- Tcl_GetHashKey(&textPtr->markTable, hPtr));
- }
- } else {
- Tcl_AppendResult(interp, "bad image option "", argv[2],
- "": must be cget, configure, create, or names",
- (char *) NULL);
- return TCL_ERROR;
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageConfigure --
- *
- * This procedure is called to handle configuration options
- * for an embedded image, using an argc/argv list.
- *
- * Results:
- * The return value is a standard Tcl result. If TCL_ERROR is
- * returned, then the interp's result contains an error message..
- *
- * Side effects:
- * Configuration information for the embedded image changes,
- * such as alignment, or name of the image.
- *
- *--------------------------------------------------------------
- */
- static int
- EmbImageConfigure(textPtr, eiPtr, argc, argv)
- TkText *textPtr; /* Information about text widget that
- * contains embedded image. */
- TkTextSegment *eiPtr; /* Embedded image to be configured. */
- int argc; /* Number of strings in argv. */
- CONST char **argv; /* Array of strings describing configuration
- * options. */
- {
- Tk_Image image;
- Tcl_DString newName;
- Tcl_HashEntry *hPtr;
- Tcl_HashSearch search;
- int new;
- char *name;
- int count = 0; /* The counter for picking a unique name */
- int conflict = 0; /* True if we have a name conflict */
- unsigned int len; /* length of image name */
- if (Tk_ConfigureWidget(textPtr->interp, textPtr->tkwin, configSpecs,
- argc, argv, (char *) &eiPtr->body.ei,TK_CONFIG_ARGV_ONLY)
- != TCL_OK) {
- return TCL_ERROR;
- }
- /*
- * Create the image. Save the old image around and don't free it
- * until after the new one is allocated. This keeps the reference
- * count from going to zero so the image doesn't have to be recreated
- * if it hasn't changed.
- */
- if (eiPtr->body.ei.imageString != NULL) {
- image = Tk_GetImage(textPtr->interp, textPtr->tkwin, eiPtr->body.ei.imageString,
- EmbImageProc, (ClientData) eiPtr);
- if (image == NULL) {
- return TCL_ERROR;
- }
- } else {
- image = NULL;
- }
- if (eiPtr->body.ei.image != NULL) {
- Tk_FreeImage(eiPtr->body.ei.image);
- }
- eiPtr->body.ei.image = image;
- if (eiPtr->body.ei.name != NULL) {
- return TCL_OK;
- }
- /*
- * Find a unique name for this image. Use imageName (or imageString)
- * if available, otherwise tack on a #nn and use it. If a name is already
- * associated with this image, delete the name.
- */
- name = eiPtr->body.ei.imageName;
- if (name == NULL) {
- name = eiPtr->body.ei.imageString;
- }
- if (name == NULL) {
- Tcl_AppendResult(textPtr->interp,"Either a "-name" ",
- "or a "-image" argument must be provided ",
- "to the "image create" subcommand.",
- (char *) NULL);
- return TCL_ERROR;
- }
- len = strlen(name);
- for (hPtr = Tcl_FirstHashEntry(&textPtr->imageTable, &search);
- hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
- char *haveName = Tcl_GetHashKey(&textPtr->imageTable, hPtr);
- if (strncmp(name, haveName, len) == 0) {
- new = 0;
- sscanf(haveName+len,"#%d",&new);
- if (new > count) {
- count = new;
- }
- if (len == (int) strlen(haveName)) {
- conflict = 1;
- }
- }
- }
- Tcl_DStringInit(&newName);
- Tcl_DStringAppend(&newName,name, -1);
- if (conflict) {
- char buf[4 + TCL_INTEGER_SPACE];
- sprintf(buf, "#%d",count+1);
- Tcl_DStringAppend(&newName,buf, -1);
- }
- name = Tcl_DStringValue(&newName);
- hPtr = Tcl_CreateHashEntry(&textPtr->imageTable, name, &new);
- Tcl_SetHashValue(hPtr, eiPtr);
- Tcl_AppendResult(textPtr->interp, name , (char *) NULL);
- eiPtr->body.ei.name = ckalloc((unsigned) Tcl_DStringLength(&newName)+1);
- strcpy(eiPtr->body.ei.name,name);
- Tcl_DStringFree(&newName);
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * AlignParseProc --
- *
- * This procedure is invoked by Tk_ConfigureWidget during
- * option processing to handle "-align" options for embedded
- * images.
- *
- * Results:
- * A standard Tcl return value.
- *
- * Side effects:
- * The alignment for the embedded image may change.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static int
- AlignParseProc(clientData, interp, tkwin, value, widgRec, offset)
- ClientData clientData; /* Not used.*/
- Tcl_Interp *interp; /* Used for reporting errors. */
- Tk_Window tkwin; /* Window for text widget. */
- CONST char *value; /* Value of option. */
- char *widgRec; /* Pointer to TkTextEmbWindow
- * structure. */
- int offset; /* Offset into item (ignored). */
- {
- register TkTextEmbImage *embPtr = (TkTextEmbImage *) widgRec;
- if (strcmp(value, "baseline") == 0) {
- embPtr->align = ALIGN_BASELINE;
- } else if (strcmp(value, "bottom") == 0) {
- embPtr->align = ALIGN_BOTTOM;
- } else if (strcmp(value, "center") == 0) {
- embPtr->align = ALIGN_CENTER;
- } else if (strcmp(value, "top") == 0) {
- embPtr->align = ALIGN_TOP;
- } else {
- Tcl_AppendResult(interp, "bad alignment "", value,
- "": must be baseline, bottom, center, or top",
- (char *) NULL);
- return TCL_ERROR;
- }
- return TCL_OK;
- }
- /*
- *--------------------------------------------------------------
- *
- * AlignPrintProc --
- *
- * This procedure is invoked by the Tk configuration code
- * to produce a printable string for the "-align" configuration
- * option for embedded images.
- *
- * Results:
- * The return value is a string describing the embedded
- * images's current alignment.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static char *
- AlignPrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
- ClientData clientData; /* Ignored. */
- Tk_Window tkwin; /* Window for text widget. */
- char *widgRec; /* Pointer to TkTextEmbImage
- * structure. */
- int offset; /* Ignored. */
- Tcl_FreeProc **freeProcPtr; /* Pointer to variable to fill in with
- * information about how to reclaim
- * storage for return string. */
- {
- switch (((TkTextEmbImage *) widgRec)->align) {
- case ALIGN_BASELINE:
- return "baseline";
- case ALIGN_BOTTOM:
- return "bottom";
- case ALIGN_CENTER:
- return "center";
- case ALIGN_TOP:
- return "top";
- default:
- return "??";
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageDeleteProc --
- *
- * This procedure is invoked by the text B-tree code whenever
- * an embedded image lies in a range of characters being deleted.
- *
- * Results:
- * Returns 0 to indicate that the deletion has been accepted.
- *
- * Side effects:
- * The embedded image is deleted, if it exists, and any resources
- * associated with it are released.
- *
- *--------------------------------------------------------------
- */
- /* ARGSUSED */
- static int
- EmbImageDeleteProc(eiPtr, linePtr, treeGone)
- TkTextSegment *eiPtr; /* Segment being deleted. */
- TkTextLine *linePtr; /* Line containing segment. */
- int treeGone; /* Non-zero means the entire tree is
- * being deleted, so everything must
- * get cleaned up. */
- {
- Tcl_HashEntry *hPtr;
- if (eiPtr->body.ei.image != NULL) {
- hPtr = Tcl_FindHashEntry(&eiPtr->body.ei.textPtr->imageTable,
- eiPtr->body.ei.name);
- if (hPtr != NULL) {
- /*
- * (It's possible for there to be no hash table entry for this
- * image, if an error occurred while creating the image segment
- * but before the image got added to the table)
- */
- Tcl_DeleteHashEntry(hPtr);
- }
- Tk_FreeImage(eiPtr->body.ei.image);
- }
- Tk_FreeOptions(configSpecs, (char *) &eiPtr->body.ei,
- eiPtr->body.ei.textPtr->display, 0);
- if (eiPtr->body.ei.name != NULL) {
- ckfree(eiPtr->body.ei.name);
- }
- ckfree((char *) eiPtr);
- return 0;
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageCleanupProc --
- *
- * This procedure is invoked by the B-tree code whenever a
- * segment containing an embedded image is moved from one
- * line to another.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The linePtr field of the segment gets updated.
- *
- *--------------------------------------------------------------
- */
- static TkTextSegment *
- EmbImageCleanupProc(eiPtr, linePtr)
- TkTextSegment *eiPtr; /* Mark segment that's being moved. */
- TkTextLine *linePtr; /* Line that now contains segment. */
- {
- eiPtr->body.ei.linePtr = linePtr;
- return eiPtr;
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageLayoutProc --
- *
- * This procedure is the "layoutProc" for embedded image
- * segments.
- *
- * Results:
- * 1 is returned to indicate that the segment should be
- * displayed. The chunkPtr structure is filled in.
- *
- * Side effects:
- * None, except for filling in chunkPtr.
- *
- *--------------------------------------------------------------
- */
- /*ARGSUSED*/
- static int
- EmbImageLayoutProc(textPtr, indexPtr, eiPtr, offset, maxX, maxChars,
- noCharsYet, wrapMode, chunkPtr)
- TkText *textPtr; /* Text widget being layed out. */
- TkTextIndex *indexPtr; /* Identifies first character in chunk. */
- TkTextSegment *eiPtr; /* Segment corresponding to indexPtr. */
- int offset; /* Offset within segPtr corresponding to
- * indexPtr (always 0). */
- int maxX; /* Chunk must not occupy pixels at this
- * position or higher. */
- int maxChars; /* Chunk must not include more than this
- * many characters. */
- int noCharsYet; /* Non-zero means no characters have been
- * assigned to this line yet. */
- TkWrapMode wrapMode; /* Wrap mode to use for line: TEXT_WRAPMODE_CHAR,
- * TEXT_WRAPMODE_NONE, or TEXT_WRAPMODE_WORD. */
- register TkTextDispChunk *chunkPtr;
- /* Structure to fill in with information
- * about this chunk. The x field has already
- * been set by the caller. */
- {
- int width, height;
- if (offset != 0) {
- panic("Non-zero offset in EmbImageLayoutProc");
- }
- /*
- * See if there's room for this image on this line.
- */
- if (eiPtr->body.ei.image == NULL) {
- width = 0;
- height = 0;
- } else {
- Tk_SizeOfImage(eiPtr->body.ei.image, &width, &height);
- width += 2*eiPtr->body.ei.padX;
- height += 2*eiPtr->body.ei.padY;
- }
- if ((width > (maxX - chunkPtr->x))
- && !noCharsYet && (textPtr->wrapMode != TEXT_WRAPMODE_NONE)) {
- return 0;
- }
- /*
- * Fill in the chunk structure.
- */
- chunkPtr->displayProc = EmbImageDisplayProc;
- chunkPtr->undisplayProc = (Tk_ChunkUndisplayProc *) NULL;
- chunkPtr->measureProc = (Tk_ChunkMeasureProc *) NULL;
- chunkPtr->bboxProc = EmbImageBboxProc;
- chunkPtr->numBytes = 1;
- if (eiPtr->body.ei.align == ALIGN_BASELINE) {
- chunkPtr->minAscent = height - eiPtr->body.ei.padY;
- chunkPtr->minDescent = eiPtr->body.ei.padY;
- chunkPtr->minHeight = 0;
- } else {
- chunkPtr->minAscent = 0;
- chunkPtr->minDescent = 0;
- chunkPtr->minHeight = height;
- }
- chunkPtr->width = width;
- chunkPtr->breakIndex = -1;
- chunkPtr->breakIndex = 1;
- chunkPtr->clientData = (ClientData) eiPtr;
- eiPtr->body.ei.chunkCount += 1;
- return 1;
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageCheckProc --
- *
- * This procedure is invoked by the B-tree code to perform
- * consistency checks on embedded images.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The procedure panics if it detects anything wrong with
- * the embedded image.
- *
- *--------------------------------------------------------------
- */
- static void
- EmbImageCheckProc(eiPtr, linePtr)
- TkTextSegment *eiPtr; /* Segment to check. */
- TkTextLine *linePtr; /* Line containing segment. */
- {
- if (eiPtr->nextPtr == NULL) {
- panic("EmbImageCheckProc: embedded image is last segment in line");
- }
- if (eiPtr->size != 1) {
- panic("EmbImageCheckProc: embedded image has size %d", eiPtr->size);
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageDisplayProc --
- *
- * This procedure is invoked by the text displaying code
- * when it is time to actually draw an embedded image
- * chunk on the screen.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The embedded image gets moved to the correct location
- * and drawn onto the display.
- *
- *--------------------------------------------------------------
- */
- static void
- EmbImageDisplayProc(chunkPtr, x, y, lineHeight, baseline, display, dst, screenY)
- TkTextDispChunk *chunkPtr; /* Chunk that is to be drawn. */
- int x; /* X-position in dst at which to
- * draw this chunk (differs from
- * the x-position in the chunk because
- * of scrolling). */
- int y; /* Top of rectangular bounding box
- * for line: tells where to draw this
- * chunk in dst (x-position is in
- * the chunk itself). */
- int lineHeight; /* Total height of line. */
- int baseline; /* Offset of baseline from y. */
- Display *display; /* Display to use for drawing. */
- Drawable dst; /* Pixmap or window in which to draw */
- int screenY; /* Y-coordinate in text window that
- * corresponds to y. */
- {
- TkTextSegment *eiPtr = (TkTextSegment *) chunkPtr->clientData;
- int lineX, imageX, imageY, width, height;
- Tk_Image image;
- image = eiPtr->body.ei.image;
- if (image == NULL) {
- return;
- }
- if ((x + chunkPtr->width) <= 0) {
- return;
- }
- /*
- * Compute the image's location and size in the text widget, taking
- * into account the align value for the image.
- */
- EmbImageBboxProc(chunkPtr, 0, y, lineHeight, baseline, &lineX,
- &imageY, &width, &height);
- imageX = lineX - chunkPtr->x + x;
- Tk_RedrawImage(image, 0, 0, width, height, dst,
- imageX, imageY);
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageBboxProc --
- *
- * This procedure is called to compute the bounding box of
- * the area occupied by an embedded image.
- *
- * Results:
- * There is no return value. *xPtr and *yPtr are filled in
- * with the coordinates of the upper left corner of the
- * image, and *widthPtr and *heightPtr are filled in with
- * the dimensions of the image in pixels. Note: not all
- * of the returned bbox is necessarily visible on the screen
- * (the rightmost part might be off-screen to the right,
- * and the bottommost part might be off-screen to the bottom).
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- static void
- EmbImageBboxProc(chunkPtr, index, y, lineHeight, baseline, xPtr, yPtr,
- widthPtr, heightPtr)
- TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */
- int index; /* Index of desired character within
- * the chunk. */
- int y; /* Topmost pixel in area allocated
- * for this line. */
- int lineHeight; /* Total height of line. */
- int baseline; /* Location of line's baseline, in
- * pixels measured down from y. */
- int *xPtr, *yPtr; /* Gets filled in with coords of
- * character's upper-left pixel. */
- int *widthPtr; /* Gets filled in with width of
- * character, in pixels. */
- int *heightPtr; /* Gets filled in with height of
- * character, in pixels. */
- {
- TkTextSegment *eiPtr = (TkTextSegment *) chunkPtr->clientData;
- Tk_Image image;
- image = eiPtr->body.ei.image;
- if (image != NULL) {
- Tk_SizeOfImage(image, widthPtr, heightPtr);
- } else {
- *widthPtr = 0;
- *heightPtr = 0;
- }
- *xPtr = chunkPtr->x + eiPtr->body.ei.padX;
- switch (eiPtr->body.ei.align) {
- case ALIGN_BOTTOM:
- *yPtr = y + (lineHeight - *heightPtr - eiPtr->body.ei.padY);
- break;
- case ALIGN_CENTER:
- *yPtr = y + (lineHeight - *heightPtr)/2;
- break;
- case ALIGN_TOP:
- *yPtr = y + eiPtr->body.ei.padY;
- break;
- case ALIGN_BASELINE:
- *yPtr = y + (baseline - *heightPtr);
- break;
- }
- }
- /*
- *--------------------------------------------------------------
- *
- * TkTextImageIndex --
- *
- * Given the name of an embedded image within a text widget,
- * returns an index corresponding to the image's position
- * in the text.
- *
- * Results:
- * The return value is 1 if there is an embedded image by
- * the given name in the text widget, 0 otherwise. If the
- * image exists, *indexPtr is filled in with its index.
- *
- * Side effects:
- * None.
- *
- *--------------------------------------------------------------
- */
- int
- TkTextImageIndex(textPtr, name, indexPtr)
- TkText *textPtr; /* Text widget containing image. */
- CONST char *name; /* Name of image. */
- TkTextIndex *indexPtr; /* Index information gets stored here. */
- {
- Tcl_HashEntry *hPtr;
- TkTextSegment *eiPtr;
- hPtr = Tcl_FindHashEntry(&textPtr->imageTable, name);
- if (hPtr == NULL) {
- return 0;
- }
- eiPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr);
- indexPtr->tree = textPtr->tree;
- indexPtr->linePtr = eiPtr->body.ei.linePtr;
- indexPtr->byteIndex = TkTextSegToOffset(eiPtr, indexPtr->linePtr);
- return 1;
- }
- /*
- *--------------------------------------------------------------
- *
- * EmbImageProc --
- *
- * This procedure is called by the image code whenever an
- * image or its contents changes.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The image will be redisplayed.
- *
- *--------------------------------------------------------------
- */
- static void
- EmbImageProc(clientData, x, y, width, height, imgWidth, imgHeight)
- ClientData clientData; /* Pointer to widget record. */
- int x, y; /* Upper left pixel (within image)
- * that must be redisplayed. */
- int width, height; /* Dimensions of area to redisplay
- * (may be <= 0). */
- int imgWidth, imgHeight; /* New dimensions of image. */
- {
- TkTextSegment *eiPtr = (TkTextSegment *) clientData;
- TkTextIndex index;
- index.tree = eiPtr->body.ei.textPtr->tree;
- index.linePtr = eiPtr->body.ei.linePtr;
- index.byteIndex = TkTextSegToOffset(eiPtr, eiPtr->body.ei.linePtr);
- TkTextChanged(eiPtr->body.ei.textPtr, &index, &index);
- }