diff options
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/tkImgPhoto.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/generic/tkImgPhoto.c b/generic/tkImgPhoto.c index e1d83ef..c6c5e2c 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 1.36.2.15 2006/03/15 23:11:01 dkf Exp $ + * RCS: @(#) $Id: tkImgPhoto.c,v 1.36.2.16 2006/03/16 00:42:55 dkf Exp $ */ #include "tkInt.h" @@ -188,6 +188,13 @@ 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. @@ -840,6 +847,15 @@ ImgPhotoCmd(clientData, interp, objc, objv) } /* + * 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. */ @@ -4337,9 +4353,11 @@ Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height, compRule) 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; @@ -4386,6 +4404,7 @@ Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height, compRule) alphaOffset = blockPtr->offset[3]; if ((alphaOffset >= blockPtr->pixelSize) || (alphaOffset < 0)) { alphaOffset = 0; + sourceIsSimplePhoto = 1; } else { alphaOffset -= blockPtr->offset[0]; } @@ -4586,7 +4605,7 @@ Tk_PhotoPutBlock(handle, blockPtr, x, y, width, height, compRule) * 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, @@ -4666,7 +4685,7 @@ Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY, 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) { @@ -4674,6 +4693,8 @@ Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY, return; } + sourceIsSimplePhoto = compRule & SOURCE_IS_SIMPLE_ALPHA_PHOTO; + compRule &= ~SOURCE_IS_SIMPLE_ALPHA_PHOTO; masterPtr = (PhotoMaster *) handle; if (zoomX <= 0 || zoomY <= 0) { @@ -4724,6 +4745,7 @@ Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY, alphaOffset = blockPtr->offset[3]; if ((alphaOffset >= blockPtr->pixelSize) || (alphaOffset < 0)) { alphaOffset = 0; + sourceIsSimplePhoto = 1; } else { alphaOffset -= blockPtr->offset[0]; } @@ -4897,7 +4919,7 @@ Tk_PhotoPutZoomedBlock(handle, blockPtr, x, y, width, height, zoomX, zoomY, * 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, |