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Bug 336532: Animated gif with transparency shows black background, patch by Pawel Chmielowski <prefiks@aviary.pl>, r=stuart, sr=roc

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This commit is contained in:
gavin%gavinsharp.com 2006-08-11 23:48:48 +00:00
parent 7a5738d485
commit e4ee90b452
2 changed files with 25 additions and 1 deletions
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2
gfx/src/thebes/nsThebesRenderingContext.cpp
View File

@ -1016,7 +1016,7 @@ nsThebesRenderingContext::DrawImage(imgIContainer *aImage,
}
return img->Draw(*this, mDrawingSurface,
pxSr.x - pxImgFrameRect.x, pxSr.y - pxImgFrameRect.y,
pxSr.x, pxSr.y,
pxSr.width, pxSr.height,
pxDr.x, pxDr.y, pxDr.width, pxDr.height);
}

24
modules/libpr0n/decoders/gif/imgContainerGIF.cpp
View File

@ -862,6 +862,29 @@ void imgContainerGIF::SetMaskVisibility(gfxIImageFrame *aFrame,
return;
}
#ifdef MOZ_CAIRO_GFX
PRUint8* alphaData;
PRUint32 alphaDataLength;
const PRUint8 setMaskTo = aVisible ? 0xFF : 0x00;
aFrame->LockImageData();
nsresult res = aFrame->GetImageData(&alphaData, &alphaDataLength);
if (NS_SUCCEEDED(res)) {
#ifdef IS_LITTLE_ENDIAN
alphaData += aY*frameWidth*4 + 3;
#else
alphaData += aY*frameWidth*4;
#endif
for (PRInt32 j = height; j > 0; --j) {
for (PRInt32 i = (aX+width-1)*4; i >= aX; i -= 4) {
alphaData[i] = setMaskTo;
}
alphaData += frameWidth*4;
}
}
aFrame->UnlockImageData();
#else
PRUint8* alphaData;
PRUint32 alphaDataLength;
aFrame->LockAlphaData();
@ -946,6 +969,7 @@ void imgContainerGIF::SetMaskVisibility(gfxIImageFrame *aFrame,
} // if aVisible
aFrame->UnlockAlphaData();
#endif
}
//******************************************************************************