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Overview
Comment:Merge branch tip-489 following acceptation of this TIP through TCT vote.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: afa7b579c2dbe6dcc1947c4890f625e4d05fd574f667ede4fc458a4b6f048e4d
User & Date: fvogel 2018-03-04 21:45:29
Context
2018-03-04
21:57
Fix [2321708fff]: radiobutton (and checkbutton) -selectcolor behavior check-in: d913c22e user: fvogel tags: trunk
21:45
Merge branch tip-489 following acceptation of this TIP through TCT vote. check-in: afa7b579 user: fvogel tags: trunk
2018-03-01
21:39
Fix [b631acf716]: unix/tcl.m4 still contains reference to ieee library check-in: 14ee7b1d user: jan.nijtmans tags: trunk
2018-02-21
20:58
Fix error in testing argument numbers in 'canvas image' command. Thanks to RenĂ© Zaumseil. Closed-Leaf check-in: 39bf9540 user: fvogel tags: canvas_image, tip-489
Changes
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Changes to doc/canvas.n.

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See \fBINDICES\fR above for a description of the
legal forms for \fIindex\fR.
Note: the insertion cursor is only displayed in an item if
that item currently has the keyboard focus (see the \fBfocus\fR widget
command, above), but the cursor position may
be set even when the item does not have the focus.
This command returns an empty string.














.TP
\fIpathName \fBimove \fItagOrId index x y\fR
.VS 8.6
This command causes the \fIindex\fR'th coordinate of each of the items
indicated by \fItagOrId\fR to be relocated to the location (\fIx\fR,\fIy\fR).
Each item interprets \fIindex\fR independently according to the rules
described in \fBINDICES\fR above. Out of the standard set of items, only line






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See \fBINDICES\fR above for a description of the
legal forms for \fIindex\fR.
Note: the insertion cursor is only displayed in an item if
that item currently has the keyboard focus (see the \fBfocus\fR widget
command, above), but the cursor position may
be set even when the item does not have the focus.
This command returns an empty string.
.TP
\fIpathName \fBimage \fIimagename\fR ?\fIsubsample\fR? ?\fIzoom\fR?
.
Draw the canvas into the Tk photo image named \fIimagename\fR. If a \fB-scrollregion\fR
has been defined then this will be the boundaries of the canvas region drawn and the
final size of the photo image. Otherwise the widget width and height with an origin
of 0,0 will be the size of the canvas region drawn and the final size of the photo
image. Optionally an integer \fIsubsample\fR factor may be given and the photo image
will be reduced in size. In addition to the \fIsubsample\fR an integer \fIzoom\fR
factor can also be given and the photo image will be enlarged. The image background
will be filled with the canvas background colour. The canvas widget does not need to
be mapped for this widget command to work, but at least one of it's ancestors must be
mapped.
This command returns an empty string.
.TP
\fIpathName \fBimove \fItagOrId index x y\fR
.VS 8.6
This command causes the \fIindex\fR'th coordinate of each of the items
indicated by \fItagOrId\fR to be relocated to the location (\fIx\fR,\fIy\fR).
Each item interprets \fIindex\fR independently according to the rules
described in \fBINDICES\fR above. Out of the standard set of items, only line

Changes to generic/tkCanvas.c.

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			    Tcl_Interp *interp, int argc,
			    Tcl_Obj *const *argv);
static void		CanvasWorldChanged(ClientData instanceData);
static int		ConfigureCanvas(Tcl_Interp *interp,
			    TkCanvas *canvasPtr, int argc,
			    Tcl_Obj *const *argv, int flags);
static void		DestroyCanvas(char *memPtr);

static void		DisplayCanvas(ClientData clientData);
static void		DoItem(Tcl_Obj *accumObj,
			    Tk_Item *itemPtr, Tk_Uid tag);
static void		EventuallyRedrawItem(TkCanvas *canvasPtr,
			    Tk_Item *itemPtr);
#ifdef USE_OLD_TAG_SEARCH
static int		FindItems(Tcl_Interp *interp, TkCanvas *canvasPtr,
................................................................................

    int index;
    static const char *const optionStrings[] = {
	"addtag",	"bbox",		"bind",		"canvasx",
	"canvasy",	"cget",		"configure",	"coords",
	"create",	"dchars",	"delete",	"dtag",
	"find",		"focus",	"gettags",	"icursor",

	"imove",	"index",	"insert",	"itemcget",
	"itemconfigure",
	"lower",	"move",		"moveto",	"postscript",
	"raise",	"rchars",	"scale",	"scan",
	"select",	"type",		"xview",	"yview",
	NULL
    };
    enum options {
	CANV_ADDTAG,	CANV_BBOX,	CANV_BIND,	CANV_CANVASX,
	CANV_CANVASY,	CANV_CGET,	CANV_CONFIGURE,	CANV_COORDS,
	CANV_CREATE,	CANV_DCHARS,	CANV_DELETE,	CANV_DTAG,
	CANV_FIND,	CANV_FOCUS,	CANV_GETTAGS,	CANV_ICURSOR,

	CANV_IMOVE,	CANV_INDEX,	CANV_INSERT,	CANV_ITEMCGET,
	CANV_ITEMCONFIGURE,
	CANV_LOWER,	CANV_MOVE,	CANV_MOVETO,	CANV_POSTSCRIPT,
	CANV_RAISE,	CANV_RCHARS,	CANV_SCALE,	CANV_SCAN,
	CANV_SELECT,	CANV_TYPE,	CANV_XVIEW,	CANV_YVIEW
    };

................................................................................
			* (Tk_Height(canvasPtr->tkwin) - 2*canvasPtr->inset));
	    }
	    break;
	}
	CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, newY);
	break;
    }








































    }

  done:
#ifndef USE_OLD_TAG_SEARCH
    TagSearchDestroy(searchPtr);
#endif /* not USE_OLD_TAG_SEARCH */
    Tcl_Release(canvasPtr);
................................................................................
    canvasPtr->flags |= REPICK_NEEDED;
    Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
	    canvasPtr->xOrigin, canvasPtr->yOrigin,
	    canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
	    canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
}
 














































































































































































































































































































































































































































































































/*
 *----------------------------------------------------------------------
 *
 * DisplayCanvas --
 *
 *	This function redraws the contents of a canvas window. It is invoked
 *	as a do-when-idle handler, so it only runs when there's nothing else






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			    Tcl_Interp *interp, int argc,
			    Tcl_Obj *const *argv);
static void		CanvasWorldChanged(ClientData instanceData);
static int		ConfigureCanvas(Tcl_Interp *interp,
			    TkCanvas *canvasPtr, int argc,
			    Tcl_Obj *const *argv, int flags);
static void		DestroyCanvas(char *memPtr);
static int              DrawCanvas(Tcl_Interp *interp, ClientData clientData, Tk_PhotoHandle photohandle, int subsample, int zoom);
static void		DisplayCanvas(ClientData clientData);
static void		DoItem(Tcl_Obj *accumObj,
			    Tk_Item *itemPtr, Tk_Uid tag);
static void		EventuallyRedrawItem(TkCanvas *canvasPtr,
			    Tk_Item *itemPtr);
#ifdef USE_OLD_TAG_SEARCH
static int		FindItems(Tcl_Interp *interp, TkCanvas *canvasPtr,
................................................................................

    int index;
    static const char *const optionStrings[] = {
	"addtag",	"bbox",		"bind",		"canvasx",
	"canvasy",	"cget",		"configure",	"coords",
	"create",	"dchars",	"delete",	"dtag",
	"find",		"focus",	"gettags",	"icursor",
        "image",
	"imove",	"index",	"insert",	"itemcget",
	"itemconfigure",
	"lower",	"move",		"moveto",	"postscript",
	"raise",	"rchars",	"scale",	"scan",
	"select",	"type",		"xview",	"yview",
	NULL
    };
    enum options {
	CANV_ADDTAG,	CANV_BBOX,	CANV_BIND,	CANV_CANVASX,
	CANV_CANVASY,	CANV_CGET,	CANV_CONFIGURE,	CANV_COORDS,
	CANV_CREATE,	CANV_DCHARS,	CANV_DELETE,	CANV_DTAG,
	CANV_FIND,	CANV_FOCUS,	CANV_GETTAGS,	CANV_ICURSOR,
        CANV_IMAGE,
	CANV_IMOVE,	CANV_INDEX,	CANV_INSERT,	CANV_ITEMCGET,
	CANV_ITEMCONFIGURE,
	CANV_LOWER,	CANV_MOVE,	CANV_MOVETO,	CANV_POSTSCRIPT,
	CANV_RAISE,	CANV_RCHARS,	CANV_SCALE,	CANV_SCAN,
	CANV_SELECT,	CANV_TYPE,	CANV_XVIEW,	CANV_YVIEW
    };

................................................................................
			* (Tk_Height(canvasPtr->tkwin) - 2*canvasPtr->inset));
	    }
	    break;
	}
	CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, newY);
	break;
    }
    case CANV_IMAGE: {
        Tk_PhotoHandle photohandle;
        int subsample = 1, zoom = 1;

        if (objc < 3 || objc > 5) {
            Tcl_WrongNumArgs(interp, 2, objv, "imagename ?subsample? ?zoom?");
            result = TCL_ERROR;
            goto done;
        }

        if ((photohandle = Tk_FindPhoto(interp, Tcl_GetString(objv[2]) )) == 0) {
            result = TCL_ERROR;
            goto done;
        }

        /*
         * If we are given a subsample or a zoom then grab them.
         */

        if (objc >= 4 && Tcl_GetIntFromObj(interp, objv[3], &subsample) != TCL_OK) {
            result = TCL_ERROR;
            goto done;
        }
        if (objc >= 5 && Tcl_GetIntFromObj(interp, objv[4], &zoom) != TCL_OK) {
            result = TCL_ERROR;
            goto done;
        }

        /*
         * Set the image size to zero, which allows the DrawCanvas() function
         * to expand the image automatically when it copies the pixmap into it.
         */

        if (Tk_PhotoSetSize(interp, photohandle, 0, 0) != TCL_OK) {
            result = TCL_ERROR;
            goto done;
        }

        result = DrawCanvas(interp, clientData, photohandle, subsample, zoom);
    }
    }

  done:
#ifndef USE_OLD_TAG_SEARCH
    TagSearchDestroy(searchPtr);
#endif /* not USE_OLD_TAG_SEARCH */
    Tcl_Release(canvasPtr);
................................................................................
    canvasPtr->flags |= REPICK_NEEDED;
    Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
	    canvasPtr->xOrigin, canvasPtr->yOrigin,
	    canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
	    canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
}
 
/*
 *----------------------------------------------------------------------
 *
 * DecomposeMaskToShiftAndBits --
 *
 *      Given a 32 bit pixel mask, we find the position of the lowest bit and the
 *      width of the mask bits.
 *
 * Results:
 *	None.
 *
 * Side effects:
*       None.
 *
 *----------------------------------------------------------------------
 */
static void
DecomposeMaskToShiftAndBits(
    unsigned long mask,     /* The pixel mask to examine */
    int *shift,             /* Where to put the shift count (position of lowest bit) */
    int *bits)              /* Where to put the bit count (width of the pixel mask) */
{
    int i;
    
    *shift = 0;
    *bits = 0;
    
    /*
     * Find the lowest '1' bit in the mask.
     */

    for (i = 0; i < 32; ++i) {
        if (mask & 1 << i)
            break;
    }
    if (i < 32) {
        *shift = i;
        
        /*
        * Now find the next '0' bit and the width of the mask.
        */
 
        for ( ; i < 32; ++i) {
            if ((mask & 1 << i) == 0)
                break;
            else
                ++*bits;
        }
        
        /*
        * Limit to the top 8 bits if the mask was wider than 8.
        */

        if (*bits > 8) {
            *shift += *bits - 8;
            *bits = 8;
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * DrawCanvas --
 *
 *      This function draws the contents of a canvas into the given Photo image.
 *      This function is called from the widget "image" subcommand.
 *      The canvas does not need to be mapped (one of it's ancestors must be)
 *      in order for this function to work. 
 *
 * Results:
 *	None.
 *
 * Side effects:
 *      Canvas contents from within the -scrollregion or widget size are rendered
 *      into the Photo. Any errors are left in the result.
 *
 *----------------------------------------------------------------------
 */

#define OVERDRAW_PIXELS 32        /* How much larger we make the pixmap
                                   * that the canvas objects are drawn into */

/* From stackoverflow.com/questions/2100331/c-macro-definition-to-determine-big-endian-or-little-endian-machine */
#define IS_BIG_ENDIAN (*(unsigned short *)"\0\xff" < 0x100)

#define BYTE_SWAP16(n) ((((unsigned short)n)>>8) | (((unsigned short)n)<<8))
#define BYTE_SWAP32(n) (((n>>24)&0x000000FF) | ((n<<8)&0x00FF0000) | ((n>>8)&0x0000FF00) | ((n<<24)&0xFF000000))

static int
DrawCanvas(
    Tcl_Interp *interp,           /* As passed to the widget command, and we will leave errors here */
    ClientData clientData,
    Tk_PhotoHandle photohandle,   /* The photo we are rendering into */
    int subsample,                /* If either subsample or zoom are not 1 then we call Tk_PhotoPutZoomedBlock() */
    int zoom)
{
    TkCanvas * canvasPtr = clientData;
    Tk_Window tkwin;
    Display *displayPtr;
    Tk_PhotoImageBlock blockPtr = {0};
    Window wid;
    Tk_Item * itemPtr;
    Pixmap pixmap = 0;
    XImage *ximagePtr = NULL;
    Visual *visualPtr;
    GC xgc = 0;
    XGCValues xgcValues;
    int canvasX1, canvasY1, canvasX2, canvasY2, cWidth, cHeight,
        pixmapX1, pixmapY1, pixmapX2, pixmapY2, pmWidth, pmHeight,
        bitsPerPixel, bytesPerPixel, x, y, result = TCL_OK,
        rshift, gshift, bshift, rbits, gbits, bbits;

#ifdef DEBUG_DRAWCANVAS
    char buffer[128];
#endif

    if ((tkwin = canvasPtr->tkwin) == NULL) {
        Tcl_AppendResult(interp, "canvas tkwin is NULL!", NULL);
        result = TCL_ERROR;
        goto done;
    }

    /*
     * If this canvas is unmapped, then we won't have a window id, so we will
     * try the ancestors of the canvas until we find a window that has a
     * valid window id. The Tk_GetPixmap() call requires a valid window id.
     */

    do {

        if ((displayPtr = Tk_Display(tkwin)) == NULL) {
            Tcl_AppendResult(interp, "canvas (or parent) display is NULL!", NULL);
            result = TCL_ERROR;
            goto done;
        }

        if ((wid = Tk_WindowId(tkwin)) != 0) {
            continue;
        }

        if ((tkwin = Tk_Parent(tkwin)) == NULL) {
            Tcl_AppendResult(interp, "canvas has no parent with a valid window id! Is the toplevel window mapped?", NULL);
            result = TCL_ERROR;
            goto done;
        }

    } while (wid == 0);

    bitsPerPixel = Tk_Depth(tkwin);
    visualPtr = Tk_Visual(tkwin);

    if (subsample == 0) {
        Tcl_AppendResult(interp, "subsample cannot be zero", NULL);
        result = TCL_ERROR;
        goto done;
    }

    /*
    * Scan through the item list, registering the bounding box for all items
    * that didn't do that for the final coordinates yet. This can be
    * determined by the FORCE_REDRAW flag.
    */

    for (itemPtr = canvasPtr -> firstItemPtr; itemPtr != NULL; 
            itemPtr = itemPtr -> nextPtr) {
        if (itemPtr -> redraw_flags & FORCE_REDRAW) {
            itemPtr -> redraw_flags &= ~FORCE_REDRAW;
            EventuallyRedrawItem(canvasPtr, itemPtr);
            itemPtr -> redraw_flags &= ~FORCE_REDRAW;
        }
    }

    /*
     * The DisplayCanvas() function works out the region that needs redrawing,
     * but we don't do this. We grab the whole scrollregion or canvas window
     * area. If we have a defined -scrollregion we use that as the drawing
     * region, otherwise use the canvas window height and width with an origin
     * of 0,0.
     */
    if (canvasPtr->scrollX1 != 0 || canvasPtr->scrollY1 != 0 ||
            canvasPtr->scrollX2 != 0 || canvasPtr->scrollY2 != 0) {

        canvasX1 = canvasPtr->scrollX1;
        canvasY1 = canvasPtr->scrollY1;
        canvasX2 = canvasPtr->scrollX2;
        canvasY2 = canvasPtr->scrollY2;
        cWidth = canvasX2 - canvasX1 + 1;
        cHeight = canvasY2 - canvasY1 + 1;

    } else {

        cWidth = Tk_Width(tkwin);
        cHeight = Tk_Height(tkwin);
        canvasX1 = 0;
        canvasY1 = 0;
        canvasX2 = canvasX1 + cWidth - 1;
        canvasY2 = canvasY1 + cHeight - 1;
    }
    
    /*
     * Allocate a pixmap to draw into. We add OVERDRAW_PIXELS in the same way
     * that DisplayCanvas() does to avoid problems on some systems when objects
     * are being drawn too close to the edge.
     */

    pixmapX1 = canvasX1 - OVERDRAW_PIXELS;
    pixmapY1 = canvasY1 - OVERDRAW_PIXELS;
    pixmapX2 = canvasX2 + OVERDRAW_PIXELS;
    pixmapY2 = canvasY2 + OVERDRAW_PIXELS;
    pmWidth = pixmapX2 - pixmapX1 + 1;
    pmHeight = pixmapY2 - pixmapY1 + 1;
    if ((pixmap = Tk_GetPixmap(displayPtr, Tk_WindowId(tkwin), pmWidth, pmHeight,
            bitsPerPixel)) == 0) {
        Tcl_AppendResult(interp, "failed to create drawing Pixmap", NULL);
        result = TCL_ERROR;
        goto done;
    }

    /*
     * Before we can draw the canvas objects into the pixmap it's background
     * should be filled with canvas background colour.
     */

    xgcValues.function = GXcopy;
    xgcValues.foreground = Tk_3DBorderColor(canvasPtr->bgBorder)->pixel;
    xgc = XCreateGC(displayPtr, pixmap, GCFunction|GCForeground, &xgcValues);
    XFillRectangle(displayPtr,pixmap,xgc,0,0,pmWidth,pmHeight);

    /*
     * Draw all the cavas items into the pixmap
     */

    canvasPtr->drawableXOrigin = pixmapX1;
    canvasPtr->drawableYOrigin = pixmapY1;
    for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
            itemPtr = itemPtr->nextPtr) {
        if ((itemPtr->x1 >= pixmapX2) || (itemPtr->y1 >= pixmapY2) ||
                (itemPtr->x2 < pixmapX1) || (itemPtr->y2 < pixmapY1)) {
            if (!AlwaysRedraw(itemPtr)) {
                continue;
            }
        }
        if (itemPtr->state == TK_STATE_HIDDEN || 
                (itemPtr->state == TK_STATE_NULL && canvasPtr->canvas_state
                == TK_STATE_HIDDEN)) {
            continue;
        }
        ItemDisplay(canvasPtr, itemPtr, pixmap, pixmapX1, pixmapY1, pmWidth,
                pmHeight);
    }
    
    /*
     * Copy the Pixmap into an ZPixmap format XImage so we can copy it across
     * to the photo image. This seems to be the only way to get Pixmap image
     * data out of an image. Note we have to account for the OVERDRAW_PIXELS
     * border width.
     */

    if ((ximagePtr = XGetImage(displayPtr, pixmap, -pixmapX1, -pixmapY1, cWidth,
            cHeight, AllPlanes, ZPixmap)) == NULL) {
        Tcl_AppendResult(interp, "failed to copy Pixmap to XImage", NULL);
        result = TCL_ERROR;
        goto done;
    }
    
#ifdef DEBUG_DRAWCANVAS
    Tcl_AppendResult(interp, "ximagePtr {", NULL);
    sprintf(buffer,"%d",ximagePtr->width);   Tcl_AppendResult(interp, " width ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->height);  Tcl_AppendResult(interp, " height ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->xoffset); Tcl_AppendResult(interp, " xoffset ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->format);  Tcl_AppendResult(interp, " format ", buffer, NULL);
                                             Tcl_AppendResult(interp, " ximagePtr->data", NULL);
    if (ximagePtr->data != NULL) {
	int ix, iy;

        Tcl_AppendResult(interp, " {", NULL);
	for (iy = 0; iy < ximagePtr->height; ++ iy) {
	    Tcl_AppendResult(interp, " {", NULL);
	    for (ix = 0; ix < ximagePtr->bytes_per_line; ++ ix) {
	        if (ix > 0) {
                    if (ix % 4 == 0)
                        Tcl_AppendResult(interp, "-", NULL);
                    else
                        Tcl_AppendResult(interp, " ", NULL);
                }
	        sprintf(buffer,"%2.2x",ximagePtr->data[ximagePtr->bytes_per_line * iy + ix]&0xFF);
	        Tcl_AppendResult(interp, buffer, NULL);
	    }
	    Tcl_AppendResult(interp, " }", NULL);
	}
	Tcl_AppendResult(interp, " }", NULL);
    } else
	sprintf(buffer," NULL");
    sprintf(buffer,"%d",ximagePtr->byte_order);       Tcl_AppendResult(interp, " byte_order ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->bitmap_unit);      Tcl_AppendResult(interp, " bitmap_unit ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->bitmap_bit_order); Tcl_AppendResult(interp, " bitmap_bit_order ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->bitmap_pad);       Tcl_AppendResult(interp, " bitmap_pad ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->depth);            Tcl_AppendResult(interp, " depth ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->bytes_per_line);   Tcl_AppendResult(interp, " bytes_per_line ", buffer, NULL);
    sprintf(buffer,"%d",ximagePtr->bits_per_pixel);   Tcl_AppendResult(interp, " bits_per_pixel ", buffer, NULL);
    sprintf(buffer,"0x%8.8lx",ximagePtr->red_mask);   Tcl_AppendResult(interp, " red_mask ", buffer, NULL);
    sprintf(buffer,"0x%8.8lx",ximagePtr->green_mask); Tcl_AppendResult(interp, " green_mask ", buffer, NULL);
    sprintf(buffer,"0x%8.8lx",ximagePtr->blue_mask);  Tcl_AppendResult(interp, " blue_mask ", buffer, NULL);
    Tcl_AppendResult(interp, " }", NULL);
    
    Tcl_AppendResult(interp, "\nvisualPtr {", NULL);
    sprintf(buffer,"0x%8.8lx",visualPtr->red_mask);   Tcl_AppendResult(interp, " red_mask ", buffer, NULL);
    sprintf(buffer,"0x%8.8lx",visualPtr->green_mask); Tcl_AppendResult(interp, " green_mask ", buffer, NULL);
    sprintf(buffer,"0x%8.8lx",visualPtr->blue_mask);  Tcl_AppendResult(interp, " blue_mask ", buffer, NULL);
    Tcl_AppendResult(interp, " }", NULL);
    
#endif

    /*
     * Fill in the PhotoImageBlock structure abd allocate a block of memory
     * for the converted image data. Note we allocate an alpha channel even
     * though we don't use one, because this layout helps Tk_PhotoPutBlock()
     * use memcpy() instead of the slow pixel or line copy.
     */

    blockPtr.width = cWidth;
    blockPtr.height = cHeight;
    blockPtr.pixelSize = 4;
    blockPtr.pitch = blockPtr.pixelSize * blockPtr.width;
    blockPtr.offset[0] = 0;
    blockPtr.offset[1] = 1;
    blockPtr.offset[2] = 2;
    blockPtr.offset[3] = 3;
    blockPtr.pixelPtr = ckalloc(blockPtr.pixelSize * blockPtr.height * blockPtr.width);

    /*
     * Now convert the image data pixel by pixel from XImage to 32bit RGBA
     * format suitable for Tk_PhotoPutBlock().
     */

    DecomposeMaskToShiftAndBits(visualPtr->red_mask,&rshift,&rbits);
    DecomposeMaskToShiftAndBits(visualPtr->green_mask,&gshift,&gbits);
    DecomposeMaskToShiftAndBits(visualPtr->blue_mask,&bshift,&bbits);

#ifdef DEBUG_DRAWCANVAS
    sprintf(buffer,"%d",rshift); Tcl_AppendResult(interp, "\nbits { rshift ", buffer, NULL);
    sprintf(buffer,"%d",gshift); Tcl_AppendResult(interp, " gshift ", buffer, NULL);
    sprintf(buffer,"%d",bshift); Tcl_AppendResult(interp, " bshift ", buffer, NULL);
    sprintf(buffer,"%d",rbits);  Tcl_AppendResult(interp, " rbits ", buffer, NULL);
    sprintf(buffer,"%d",gbits);  Tcl_AppendResult(interp, " gbits ", buffer, NULL);
    sprintf(buffer,"%d",bbits);  Tcl_AppendResult(interp, " bbits ", buffer, " }", NULL);
    Tcl_AppendResult(interp, "\nConverted_image {", NULL);
#endif

    /* Ok, had to use ximagePtr->bits_per_pixel here and in the switch (...)
     * below to get this to work on Windows. X11 correctly sets the bitmap
     *_pad and bitmap_unit fields to 32, but on Windows they are 0 and 8
     * respectively!
     */

    bytesPerPixel = ximagePtr->bits_per_pixel/8;
    for (y = 0; y < blockPtr.height; ++y) {

#ifdef DEBUG_DRAWCANVAS
        Tcl_AppendResult(interp, " {", NULL);
#endif

        for(x = 0; x < blockPtr.width; ++x) {
            unsigned long pixel;

            switch (ximagePtr->bits_per_pixel) {

                /*
                 * Get an 8 bit pixel from the XImage.
                 */

                case 8 :
                    pixel = *((unsigned char *)(ximagePtr->data + bytesPerPixel * x
                            + ximagePtr->bytes_per_line * y));
                    break;

                /*
                 * Get a 16 bit pixel from the XImage, and correct the
                 * byte order as necessary.
                 */

                case 16 :
                    pixel = *((unsigned short *)(ximagePtr->data + bytesPerPixel * x
                            + ximagePtr->bytes_per_line * y));
                    if ((IS_BIG_ENDIAN && ximagePtr->byte_order == LSBFirst)
                            || (!IS_BIG_ENDIAN && ximagePtr->byte_order == MSBFirst))
                        pixel = BYTE_SWAP16(pixel);
                    break;

                /*
                 * Grab a 32 bit pixel from the XImage, and correct the
                 * byte order as necessary.
                 */

                case 32 :
                    pixel = *((unsigned long *)(ximagePtr->data + bytesPerPixel * x
                            + ximagePtr->bytes_per_line * y));
                    if ((IS_BIG_ENDIAN && ximagePtr->byte_order == LSBFirst)
                            || (!IS_BIG_ENDIAN && ximagePtr->byte_order == MSBFirst))
                        pixel = BYTE_SWAP32(pixel);
                    break;
            }

            /*
             * We have a pixel with the correct byte order, so pull out the
             * colours and place them in the photo block. Perhaps we could
             * just not bother with the alpha byte because we are using
             * TK_PHOTO_COMPOSITE_SET later?
             * ***Windows: We have to swap the red and blue values. The
             * XImage storage is B - G - R - A which becomes a 32bit ARGB
             * quad. However the visual mask is a 32bit ABGR quad. And
             * Tk_PhotoPutBlock() wants R-G-B-A which is a 32bit ABGR quad.
             * If the visual mask was correct there would be no need to
             * swap anything here.
             */

#ifdef _WIN32
#define   R_OFFSET 2
#define   B_OFFSET 0
#else
#define   R_OFFSET 0
#define   B_OFFSET 2
#endif
            blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x + R_OFFSET] =
                    (unsigned char)((pixel & visualPtr->red_mask) >> rshift);
            blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x +1] =
                    (unsigned char)((pixel & visualPtr->green_mask) >> gshift);
            blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x + B_OFFSET] =
                    (unsigned char)((pixel & visualPtr->blue_mask) >> bshift);
            blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x +3] = 0xFF;

#ifdef DEBUG_DRAWCANVAS
            {
		int ix;
                if (x > 0)
                    Tcl_AppendResult(interp, "-", NULL);
	        for (ix = 0; ix < 4; ++ix) {
                    if (ix > 0)
                        Tcl_AppendResult(interp, " ", NULL);
		    sprintf(buffer,"%2.2x",blockPtr.pixelPtr[blockPtr.pitch * y
                            + blockPtr.pixelSize * x + ix]&0xFF);
                    Tcl_AppendResult(interp, buffer, NULL);
                }
            }
#endif

        }

#ifdef DEBUG_DRAWCANVAS
        Tcl_AppendResult(interp, " }", NULL);
#endif

    }

#ifdef DEBUG_DRAWCANVAS
    Tcl_AppendResult(interp, " }", NULL);
#endif

    /*
     * Now put the copied pixmap into the photo.
     * If either zoom or subsample are not 1, we use the zoom function.
     */

    if (subsample != 1 || zoom != 1) {
        if ((result = Tk_PhotoPutZoomedBlock(interp, photohandle, &blockPtr,
                0, 0, cWidth * zoom / subsample, cHeight * zoom / subsample,
                zoom, zoom, subsample, subsample, TK_PHOTO_COMPOSITE_SET))
                != TCL_OK) {
            goto done;
        }
    } else {
        if ((result = Tk_PhotoPutBlock(interp, photohandle, &blockPtr, 0, 0,
            cWidth, cHeight, TK_PHOTO_COMPOSITE_SET)) != TCL_OK) {
            goto done;
        }
    }

    /*
     * Clean up anything we have allocated and exit.
     */

done:
    if (blockPtr.pixelPtr)
        ckfree(blockPtr.pixelPtr);
    if (pixmap)
        Tk_FreePixmap(Tk_Display(tkwin), pixmap);
    if (ximagePtr)
        XDestroyImage(ximagePtr);
    if (xgc)
        XFreeGC(displayPtr,xgc);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * DisplayCanvas --
 *
 *	This function redraws the contents of a canvas window. It is invoked
 *	as a do-when-idle handler, so it only runs when there's nothing else

Changes to tests/canvas.test.

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    canvas .c
} -body {
    set id [.c create line 0 0 1 1]
    .c rchars $id 1 foo {2 2}
} -cleanup {
    destroy .c
} -returnCodes error -result {bad index "foo"}

























































































# cleanup
imageCleanup
cleanupTests
return

# Local Variables:
# mode: tcl
# End:







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    canvas .c
} -body {
    set id [.c create line 0 0 1 1]
    .c rchars $id 1 foo {2 2}
} -cleanup {
    destroy .c
} -returnCodes error -result {bad index "foo"}

# Procedure used in test cases 20.1 20.2 20.3
proc matchPixels {pixels expected} {
    set matched 1
    foreach pline $pixels eline $expected {
        foreach ppixel $pline epixel $eline {
            if {$ppixel != $epixel} {
                set matched 0
                break
            }
        }
    }
    return $matched
}

test canvas-20.1 {canvas image} -setup {
    canvas .c
    image create photo testimage
} -body  {
    .c configure -background #c0c0c0 -scrollregion {0 0 9 9}
    .c create rectangle 0 0 0 9 -fill #000080 -outline #000080
    .c image testimage
    matchPixels [testimage data] { \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
            {#000080 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0}}
} -cleanup {
    destroy .c
    image delete testimage
} -result 1

test canvas-20.2 {canvas image with subsample} -setup {
    canvas .c
    image create photo testimage
} -body  {
    .c configure -background #c0c0c0 -scrollregion {0 0 9 9}
    .c create rectangle 0 0 1 9 -fill #008000 -outline #008000
    .c image testimage 2
    matchPixels [testimage data] { \
        {#008000 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#008000 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#008000 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#008000 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#008000 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0}}
} -cleanup {
    destroy .c
    image delete testimage
} -result 1

test canvas-20.3 {canvas image with subsample and zoom} -setup {
    canvas .c
    image create photo testimage
} -body  {
    .c configure -background #c0c0c0 -scrollregion {0 0 9 9}
    .c create rectangle 0 0 9 0 -fill #800000 -outline #800000
    .c image testimage 1 2
    matchPixels [testimage data] { \
        {#800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000} \
        {#800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000 #800000} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0} \
        {#c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0 #c0c0c0}}
} -cleanup {
    destroy .c
    image delete testimage
} -result 1

# cleanup
imageCleanup
cleanupTests
return

# Local Variables:
# mode: tcl
# End: