/* * 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 1.19.2.1 2007/09/07 01:25:36 dgp Exp $ */ #include "tkPort.h" #include "tkText.h" /* * Macro that determines the size of an embedded image segment: */ #define EI_SEG_SIZE \ ((unsigned) (Tk_Offset(TkTextSegment, body) + sizeof(TkTextEmbImage))) /* * Prototypes for functions defined in this file: */ static TkTextSegment * EmbImageCleanupProc(TkTextSegment *segPtr, TkTextLine *linePtr); static void EmbImageCheckProc(TkTextSegment *segPtr, TkTextLine *linePtr); static void EmbImageBboxProc(TkText *textPtr, TkTextDispChunk *chunkPtr, int index, int y, int lineHeight, int baseline, int *xPtr, int *yPtr, int *widthPtr, int *heightPtr); static int EmbImageConfigure(TkText *textPtr, TkTextSegment *eiPtr, int objc, Tcl_Obj *const objv[]); static int EmbImageDeleteProc(TkTextSegment *segPtr, TkTextLine *linePtr, int treeGone); static void EmbImageDisplayProc(TkText *textPtr, TkTextDispChunk *chunkPtr, int x, int y, int lineHeight, int baseline, Display *display, Drawable dst, int screenY); static int EmbImageLayoutProc(TkText *textPtr, TkTextIndex *indexPtr, TkTextSegment *segPtr, int offset, int maxX, int maxChars, int noCharsYet, TkWrapMode wrapMode, TkTextDispChunk *chunkPtr); static void EmbImageProc(ClientData clientData, int x, int y, int width, int height, int imageWidth, int imageHeight); /* * The following structure declares the "embedded image" segment type. */ static const Tk_SegType tkTextEmbImageType = { "image", /* name */ 0, /* leftGravity */ NULL, /* splitProc */ EmbImageDeleteProc, /* deleteProc */ EmbImageCleanupProc, /* cleanupProc */ NULL, /* lineChangeProc */ EmbImageLayoutProc, /* layoutProc */ EmbImageCheckProc /* checkProc */ }; /* * Definitions for alignment values: */ static char *alignStrings[] = { "baseline", "bottom", "center", "top", NULL }; typedef enum { ALIGN_BASELINE, ALIGN_BOTTOM, ALIGN_CENTER, ALIGN_TOP } alignMode; /* * Information used for parsing image configuration options: */ static const Tk_OptionSpec optionSpecs[] = { {TK_OPTION_STRING_TABLE, "-align", NULL, NULL, "center", -1, Tk_Offset(TkTextEmbImage, align), 0, (ClientData) alignStrings, 0}, {TK_OPTION_PIXELS, "-padx", NULL, NULL, "0", -1, Tk_Offset(TkTextEmbImage, padX), 0, 0, 0}, {TK_OPTION_PIXELS, "-pady", NULL, NULL, "0", -1, Tk_Offset(TkTextEmbImage, padY), 0, 0, 0}, {TK_OPTION_STRING, "-image", NULL, NULL, NULL, -1, Tk_Offset(TkTextEmbImage, imageString), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_STRING, "-name", NULL, NULL, NULL, -1, Tk_Offset(TkTextEmbImage, imageName), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_END} }; /* *-------------------------------------------------------------- * * TkTextImageCmd -- * * This function 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( register TkText *textPtr, /* Information about text widget. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. Someone else has already * parsed this command enough to know that * objv[1] is "image". */ { int idx; register TkTextSegment *eiPtr; TkTextIndex index; static const char *optionStrings[] = { "cget", "configure", "create", "names", NULL }; enum opts { CMD_CGET, CMD_CONF, CMD_CREATE, CMD_NAMES }; if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "option ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[2], optionStrings, "option", 0, &idx) != TCL_OK) { return TCL_ERROR; } switch ((enum opts) idx) { case CMD_CGET: { Tcl_Obj *objPtr; if (objc != 5) { Tcl_WrongNumArgs(interp, 3, objv, "index option"); return TCL_ERROR; } if (TkTextGetObjIndex(interp, textPtr, objv[3], &index) != TCL_OK) { return TCL_ERROR; } eiPtr = TkTextIndexToSeg(&index, NULL); if (eiPtr->typePtr != &tkTextEmbImageType) { Tcl_AppendResult(interp, "no embedded image at index \"", Tcl_GetString(objv[3]), "\"", NULL); return TCL_ERROR; } objPtr = Tk_GetOptionValue(interp, (char *) &eiPtr->body.ei, eiPtr->body.ei.optionTable, objv[4], textPtr->tkwin); if (objPtr == NULL) { return TCL_ERROR; } else { Tcl_SetObjResult(interp, objPtr); return TCL_OK; } } case CMD_CONF: if (objc < 4) { Tcl_WrongNumArgs(interp, 3, objv, "index ?option value ...?"); return TCL_ERROR; } if (TkTextGetObjIndex(interp, textPtr, objv[3], &index) != TCL_OK) { return TCL_ERROR; } eiPtr = TkTextIndexToSeg(&index, NULL); if (eiPtr->typePtr != &tkTextEmbImageType) { Tcl_AppendResult(interp, "no embedded image at index \"", Tcl_GetString(objv[3]), "\"", NULL); return TCL_ERROR; } if (objc <= 5) { Tcl_Obj *objPtr = Tk_GetOptionInfo(interp, (char *) &eiPtr->body.ei, eiPtr->body.ei.optionTable, (objc == 5) ? objv[4] : NULL, textPtr->tkwin); if (objPtr == NULL) { return TCL_ERROR; } else { Tcl_SetObjResult(interp, objPtr); return TCL_OK; } } else { TkTextChanged(textPtr->sharedTextPtr, NULL, &index, &index); /* * It's probably not true that all window configuration can change * the line height, so we could be more efficient here and only * call this when necessary. */ TkTextInvalidateLineMetrics(textPtr->sharedTextPtr, NULL, index.linePtr, 0, TK_TEXT_INVALIDATE_ONLY); return EmbImageConfigure(textPtr, eiPtr, objc-4, objv+4); } case CMD_CREATE: { int lineIndex; /* * Add a new image. Find where to put the new image, and mark that * position for redisplay. */ if (objc < 4) { Tcl_WrongNumArgs(interp, 3, objv, "index ?option value ...?"); return TCL_ERROR; } if (TkTextGetObjIndex(interp, textPtr, objv[3], &index) != TCL_OK) { return TCL_ERROR; } /* * Don't allow insertions on the last (dummy) line of the text. */ lineIndex = TkBTreeLinesTo(textPtr, index.linePtr); if (lineIndex == TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr)) { lineIndex--; TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, textPtr, 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.sharedTextPtr = textPtr->sharedTextPtr; 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; eiPtr->body.ei.optionTable = Tk_CreateOptionTable(interp, optionSpecs); /* * Link the segment into the text widget, then configure it (delete it * again if the configuration fails). */ TkTextChanged(textPtr->sharedTextPtr, NULL, &index, &index); TkBTreeLinkSegment(eiPtr, &index); if (EmbImageConfigure(textPtr, eiPtr, objc-4, objv+4) != TCL_OK) { TkTextIndex index2; TkTextIndexForwChars(NULL, &index, 1, &index2, COUNT_INDICES); TkBTreeDeleteIndexRange(textPtr->sharedTextPtr->tree, &index, &index2); return TCL_ERROR; } TkTextInvalidateLineMetrics(textPtr->sharedTextPtr, NULL, index.linePtr, 0, TK_TEXT_INVALIDATE_ONLY); return TCL_OK; } case CMD_NAMES: { Tcl_HashSearch search; Tcl_HashEntry *hPtr; if (objc != 3) { Tcl_WrongNumArgs(interp, 3, objv, NULL); return TCL_ERROR; } for (hPtr = Tcl_FirstHashEntry(&textPtr->sharedTextPtr->imageTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { Tcl_AppendElement(interp, Tcl_GetHashKey(&textPtr->sharedTextPtr->markTable, hPtr)); } return TCL_OK; } default: Tcl_Panic("unexpected switch fallthrough"); } return TCL_ERROR; } /* *-------------------------------------------------------------- * * EmbImageConfigure -- * * This function is called to handle configuration options for an * embedded image, using an objc/objv 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( TkText *textPtr, /* Information about text widget that contains * embedded image. */ TkTextSegment *eiPtr, /* Embedded image to be configured. */ int objc, /* Number of strings in objv. */ Tcl_Obj *const objv[]) /* Array of strings describing configuration * options. */ { Tk_Image image; Tcl_DString newName; Tcl_HashEntry *hPtr; Tcl_HashSearch search; 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_SetOptions(textPtr->interp, (char*)&eiPtr->body.ei, eiPtr->body.ei.optionTable, objc, objv, textPtr->tkwin, NULL, NULL) != 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.", NULL); return TCL_ERROR; } len = strlen(name); for (hPtr = Tcl_FirstHashEntry(&textPtr->sharedTextPtr->imageTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { char *haveName = Tcl_GetHashKey(&textPtr->sharedTextPtr->imageTable, hPtr); if (strncmp(name, haveName, len) == 0) { int newVal = 0; sscanf(haveName+len, "#%d", &newVal); if (newVal > count) { count = newVal; } if (len == 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); { int dummy; hPtr = Tcl_CreateHashEntry(&textPtr->sharedTextPtr->imageTable, name, &dummy); } Tcl_SetHashValue(hPtr, eiPtr); Tcl_AppendResult(textPtr->interp, name, NULL); eiPtr->body.ei.name = ckalloc((unsigned) Tcl_DStringLength(&newName)+1); strcpy(eiPtr->body.ei.name, name); Tcl_DStringFree(&newName); return TCL_OK; } /* *-------------------------------------------------------------- * * EmbImageDeleteProc -- * * This function 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( 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.sharedTextPtr->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); } /* * No need to supply a tkwin argument, since we have no window-specific * options. */ Tk_FreeConfigOptions((char *) &eiPtr->body.ei, eiPtr->body.ei.optionTable, NULL); ckfree((char *) eiPtr); return 0; } /* *-------------------------------------------------------------- * * EmbImageCleanupProc -- * * This function 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( TkTextSegment *eiPtr, /* Mark segment that's being moved. */ TkTextLine *linePtr) /* Line that now contains segment. */ { eiPtr->body.ei.linePtr = linePtr; return eiPtr; } /* *-------------------------------------------------------------- * * EmbImageLayoutProc -- * * This function 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( 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) { Tcl_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 = NULL; chunkPtr->measureProc = 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 function is invoked by the B-tree code to perform consistency * checks on embedded images. * * Results: * None. * * Side effects: * The function panics if it detects anything wrong with the embedded * image. * *-------------------------------------------------------------- */ static void EmbImageCheckProc( TkTextSegment *eiPtr, /* Segment to check. */ TkTextLine *linePtr) /* Line containing segment. */ { if (eiPtr->nextPtr == NULL) { Tcl_Panic("EmbImageCheckProc: embedded image is last segment in line"); } if (eiPtr->size != 1) { Tcl_Panic("EmbImageCheckProc: embedded image has size %d", eiPtr->size); } } /* *-------------------------------------------------------------- * * EmbImageDisplayProc -- * * This function 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( TkText *textPtr, 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(textPtr, 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 function 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( TkText *textPtr, 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, int *yPtr, /* Gets filled in with coords of character's * upper-left pixel. */ int *widthPtr, /* Gets filled in with width of image, in * pixels. */ int *heightPtr) /* Gets filled in with height of image, 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( 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->sharedTextPtr->imageTable, name); if (hPtr == NULL) { return 0; } eiPtr = (TkTextSegment *) Tcl_GetHashValue(hPtr); indexPtr->tree = textPtr->sharedTextPtr->tree; indexPtr->linePtr = eiPtr->body.ei.linePtr; indexPtr->byteIndex = TkTextSegToOffset(eiPtr, indexPtr->linePtr); return 1; } /* *-------------------------------------------------------------- * * EmbImageProc -- * * This function 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 clientData, /* Pointer to widget record. */ int x, int y, /* Upper left pixel (within image) that must * be redisplayed. */ int width, int height, /* Dimensions of area to redisplay (may be * <= 0). */ int imgWidth, int imgHeight)/* New dimensions of image. */ { TkTextSegment *eiPtr = (TkTextSegment *) clientData; TkTextIndex index; index.tree = eiPtr->body.ei.sharedTextPtr->tree; index.linePtr = eiPtr->body.ei.linePtr; index.byteIndex = TkTextSegToOffset(eiPtr, eiPtr->body.ei.linePtr); TkTextChanged(eiPtr->body.ei.sharedTextPtr, NULL, &index, &index); /* * It's probably not true that all image changes can change the line * height, so we could be more efficient here and only call this when * necessary. */ TkTextInvalidateLineMetrics(eiPtr->body.ei.sharedTextPtr, NULL, index.linePtr, 0, TK_TEXT_INVALIDATE_ONLY); } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */