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/*
* tkUnixPmap.c --
*
* Implement the Unix specific function calls for the pixmap
* image type.
*
* Copyright (c) 1996, Expert Interface Technologies
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
*/
#include "pixmapInt.h"
#include <stdlib.h>
#include "X11/Xlib.h"
#include "X11/Xutil.h"
#ifdef MAC_OSX_TK
#define XPutImage
#endif
typedef struct PixmapData {
Pixmap mask; /* Mask: only display pixmap pixels where
* there are 1's here. */
GC gc; /* Graphics context for displaying pixmap.
* None means there was an error while
* setting up the instance, so it cannot
* be displayed. */
} PixmapData;
/*----------------------------------------------------------------------
* TkimgInitPixmapInstance --
*
* Initializes the platform-specific data of a pixmap instance
*
*----------------------------------------------------------------------
*/
void
TkimgInitPixmapInstance(masterPtr, instancePtr)
PixmapMaster *masterPtr; /* Pointer to master for image. */
PixmapInstance *instancePtr;/* The pixmap instance. */
{
PixmapData * dataPtr;
dataPtr = (PixmapData *)ckalloc(sizeof(PixmapData));
dataPtr->mask = None;
dataPtr->gc = None;
instancePtr->clientData = (ClientData)dataPtr;
}
/*----------------------------------------------------------------------
* TkimgXpmAllocTmpBuffer --
*
* Allocate a temporary space to draw the image.
*
*----------------------------------------------------------------------
*/
void
TkimgXpmAllocTmpBuffer(masterPtr, instancePtr, imagePtr, maskPtr)
PixmapMaster * masterPtr;
PixmapInstance * instancePtr;
XImage ** imagePtr;
XImage ** maskPtr;
{
int pad;
XImage * image = NULL, * mask = NULL;
Display *display = Tk_Display(instancePtr->tkwin);
int depth;
depth = Tk_Depth(instancePtr->tkwin);
if (depth > 16) {
pad = 32;
} else if (depth > 8) {
pad = 16;
} else {
pad = 8;
}
/*
* Create the XImage structures to store the temporary image
*/
image = XCreateImage(display,
Tk_Visual(instancePtr->tkwin),
depth, ZPixmap, 0, 0,
masterPtr->size[0], masterPtr->size[1], pad, 0);
image->data =
(char *)ckalloc(image->bytes_per_line * masterPtr->size[1]);
mask = XCreateImage(display,
Tk_Visual(instancePtr->tkwin),
1, XYPixmap, 0, 0,
masterPtr->size[0], masterPtr->size[1], pad, 0);
mask->data =
(char *)ckalloc(mask->bytes_per_line * masterPtr->size[1]);
*imagePtr = image;
*maskPtr = mask;
}
void
TkimgXpmFreeTmpBuffer(masterPtr, instancePtr, image, mask)
PixmapMaster * masterPtr;
PixmapInstance * instancePtr;
XImage * image;
XImage * mask;
{
if (image) {
ckfree((char*)image->data);
image->data = NULL;
XDestroyImage(image);
}
if (mask) {
ckfree((char*)mask->data);
mask->data = NULL;
XDestroyImage(mask);
}
}
/*----------------------------------------------------------------------
* TkimgXpmSetPixel --
*
* Sets the pixel at the given (x,y) coordinate to be the given
* color.
*----------------------------------------------------------------------
*/
void
TkimgXpmSetPixel(instancePtr, image, mask, x, y, colorPtr, isTranspPtr)
PixmapInstance * instancePtr;
XImage * image;
XImage * mask;
int x;
int y;
XColor * colorPtr;
int * isTranspPtr;
{
if (colorPtr != NULL) {
XPutPixel(image, x, y, colorPtr->pixel);
XPutPixel(mask, x, y, 1);
} else {
XPutPixel(mask, x, y, 0);
*isTranspPtr = 1;
}
}
/*----------------------------------------------------------------------
* TkimgXpmRealizePixmap --
*
* On Unix: Create the pixmap from the buffer.
* On Windows: Free the mask if there are no transparent pixels.
*----------------------------------------------------------------------
*/
void
TkimgXpmRealizePixmap(masterPtr, instancePtr, image, mask, isTransp)
PixmapMaster * masterPtr;
PixmapInstance * instancePtr;
XImage * image;
XImage * mask;
int isTransp;
{
Display *display = Tk_Display(instancePtr->tkwin);
int depth = Tk_Depth(instancePtr->tkwin);
PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;
unsigned int gcMask;
XGCValues gcValues;
GC gc;
instancePtr->pixmap = Tk_GetPixmap(display,
Tk_WindowId(instancePtr->tkwin),
masterPtr->size[0], masterPtr->size[1], depth);
gc = Tk_GetGC(instancePtr->tkwin, 0, NULL);
XPutImage(display, instancePtr->pixmap,
gc, image, 0, 0, 0, 0, masterPtr->size[0], masterPtr->size[1]);
Tk_FreeGC(display, gc);
if (isTransp) {
/*
* There are transparent pixels. We need a mask.
*/
dataPtr->mask = Tk_GetPixmap(display,
Tk_WindowId(instancePtr->tkwin),
masterPtr->size[0], masterPtr->size[1], 1);
gc = XCreateGC(display, dataPtr->mask, 0, NULL);
XPutImage(display, dataPtr->mask,
gc, mask, 0, 0, 0, 0, masterPtr->size[0], masterPtr->size[1]);
XFreeGC(display, gc);
} else {
dataPtr->mask = None;
}
/*
* Allocate a GC for drawing this instance (mask is not used if there
* is no transparent pixels inside the image).
*/
if (dataPtr->mask != None) {
gcMask = GCGraphicsExposures|GCClipMask;
} else {
gcMask = GCGraphicsExposures;
}
gcValues.graphics_exposures = False;
gcValues.clip_mask = dataPtr->mask;
gc = Tk_GetGC(instancePtr->tkwin, gcMask, &gcValues);
dataPtr->gc = gc;
}
void
TkimgXpmFreeInstanceData(instancePtr, delete)
PixmapInstance *instancePtr; /* Pixmap instance. */
int delete; /* Should the instance data structure
* be deleted as well? */
{
PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;
if (dataPtr->mask != None) {
Tk_FreePixmap(Tk_Display(instancePtr->tkwin), dataPtr->mask);
dataPtr->mask = None;
}
if (dataPtr->gc != None) {
Tk_FreeGC(Tk_Display(instancePtr->tkwin), dataPtr->gc);
dataPtr->gc = None;
}
if (delete) {
ckfree((char*)dataPtr);
instancePtr->clientData = NULL;
}
}
void
TkimgpXpmDisplay(clientData, display, drawable, imageX, imageY, width,
height, drawableX, drawableY)
ClientData clientData; /* Pointer to PixmapInstance 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. */
{
PixmapInstance *instancePtr = (PixmapInstance *) clientData;
PixmapData *dataPtr = (PixmapData*)instancePtr->clientData;
/*
* If there's no graphics context, it means that an error occurred
* while creating the image instance so it can't be displayed.
*/
if (dataPtr->gc == None) {
return;
}
/*
* We always use clipping: modify the clip origin within
* the graphics context to line up with the image's origin.
* Then draw the image and reset the clip origin.
*/
XSetClipOrigin(display, dataPtr->gc, drawableX - imageX,
drawableY - imageY);
XCopyArea(display, instancePtr->pixmap, drawable, dataPtr->gc,
imageX, imageY, (unsigned) width, (unsigned) height,
drawableX, drawableY);
XSetClipOrigin(display, dataPtr->gc, 0, 0);
}
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