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-rw-r--r--generic/tkImgPhoto.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/generic/tkImgPhoto.c b/generic/tkImgPhoto.c
index 62c2192..83f5237 100644
--- a/generic/tkImgPhoto.c
+++ b/generic/tkImgPhoto.c
@@ -17,7 +17,7 @@
* Department of Computer Science,
* Australian National University.
*
- * RCS: @(#) $Id: tkImgPhoto.c,v 1.61 2006/03/15 23:20:27 dkf Exp $
+ * RCS: @(#) $Id: tkImgPhoto.c,v 1.62 2006/03/16 00:31:13 dkf Exp $
*/
#include "tkInt.h"
@@ -186,6 +186,13 @@ typedef struct PhotoMaster {
#define COMPLEX_ALPHA 4
/*
+ * Flag to OR with the compositing rule to indicate that the source, despite
+ * having an alpha channel, has simple alpha.
+ */
+
+#define SOURCE_IS_SIMPLE_ALPHA_PHOTO 0x10000000
+
+/*
* The following data structure represents all of the instances of a photo
* image in windows on a given screen that are using the same colormap.
*/
@@ -822,6 +829,15 @@ ImgPhotoCmd(
}
/*
+ * Hack to pass through the message that the place we're coming from
+ * has a simple alpha channel.
+ */
+
+ if (!(((PhotoMaster *) srcHandle)->flags & COMPLEX_ALPHA)) {
+ options.compositingRule |= SOURCE_IS_SIMPLE_ALPHA_PHOTO;
+ }
+
+ /*
* Fill in default values for unspecified parameters.
*/
@@ -4341,9 +4357,11 @@ Tk_PhotoPutBlock(
unsigned char *srcPtr, *srcLinePtr;
unsigned char *destPtr, *destLinePtr;
int pitch;
+ int sourceIsSimplePhoto = compRule & SOURCE_IS_SIMPLE_ALPHA_PHOTO;
XRectangle rect;
masterPtr = (PhotoMaster *) handle;
+ compRule &= ~SOURCE_IS_SIMPLE_ALPHA_PHOTO;
if ((masterPtr->userWidth != 0) && ((x + width) > masterPtr->userWidth)) {
width = masterPtr->userWidth - x;
@@ -4395,6 +4413,7 @@ Tk_PhotoPutBlock(
alphaOffset = blockPtr->offset[3];
if ((alphaOffset >= blockPtr->pixelSize) || (alphaOffset < 0)) {
alphaOffset = 0;
+ sourceIsSimplePhoto = 1;
} else {
alphaOffset -= blockPtr->offset[0];
}
@@ -4600,7 +4619,7 @@ Tk_PhotoPutBlock(
* Check if display code needs alpha blending...
*/
- if (alphaOffset != 0 || masterPtr->flags & COMPLEX_ALPHA) {
+ if (!sourceIsSimplePhoto || masterPtr->flags & COMPLEX_ALPHA) {
/*
* Note that we skip in the single pixel case if we can. This speeds
* up code that builds up large simple-alpha images by single pixels,
@@ -4684,7 +4703,7 @@ Tk_PhotoPutZoomedBlock(
unsigned char *destPtr, *destLinePtr;
int pitch;
int xRepeat, yRepeat;
- int blockXSkip, blockYSkip;
+ int blockXSkip, blockYSkip, sourceIsSimplePhoto;
XRectangle rect;
if (zoomX==1 && zoomY==1 && subsampleX==1 && subsampleY==1) {
@@ -4692,6 +4711,7 @@ Tk_PhotoPutZoomedBlock(
compRule);
}
+ sourceIsSimplePhoto = compRule & SOURCE_IS_SIMPLE_ALPHA_PHOTO;
masterPtr = (PhotoMaster *) handle;
if (zoomX <= 0 || zoomY <= 0) {
@@ -4746,6 +4766,7 @@ Tk_PhotoPutZoomedBlock(
alphaOffset = blockPtr->offset[3];
if ((alphaOffset >= blockPtr->pixelSize) || (alphaOffset < 0)) {
alphaOffset = 0;
+ sourceIsSimplePhoto = 1;
} else {
alphaOffset -= blockPtr->offset[0];
}
@@ -4895,7 +4916,7 @@ Tk_PhotoPutZoomedBlock(
* Check if display code needs alpha blending...
*/
- if (alphaOffset != 0 || masterPtr->flags & COMPLEX_ALPHA) {
+ if (!sourceIsSimplePhoto || masterPtr->flags & COMPLEX_ALPHA) {
/*
* Note that we skip in the single pixel case if we can. This speeds
* up code that builds up large simple-alpha images by single pixels,