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Bug 788408 - Part 2. Use glReadPixels to read back when back buffer isn't RGBA compatible. r=jgilbert

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This commit is contained in:
Kan-Ru Chen (陳侃如) 2012-10-02 10:42:13 +08:00
parent e700a809b8
commit 5c4f1982a1
1 changed files with 11 additions and 10 deletions
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21
gfx/layers/opengl/LayerManagerOGL.cpp
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@ -1276,10 +1276,16 @@ LayerManagerOGL::CreateFBOWithTexture(const nsIntRect& aRect, InitMode aInit,
0);
} else {
// Curses, incompatible formats. Take a slow path.
//
// XXX Technically CopyTexSubImage2D also has the requirement of
// matching formats, but it doesn't seem to affect us in the
// real world.
// RGBA
size_t bufferSize = aRect.width * aRect.height * 4;
nsAutoArrayPtr<uint8_t> buf(new uint8_t[bufferSize]);
mGLContext->fReadPixels(aRect.x, aRect.y,
aRect.width, aRect.height,
LOCAL_GL_RGBA,
LOCAL_GL_UNSIGNED_BYTE,
buf);
mGLContext->fTexImage2D(mFBOTextureTarget,
0,
LOCAL_GL_RGBA,
@ -1287,12 +1293,7 @@ LayerManagerOGL::CreateFBOWithTexture(const nsIntRect& aRect, InitMode aInit,
0,
LOCAL_GL_RGBA,
LOCAL_GL_UNSIGNED_BYTE,
NULL);
mGLContext->fCopyTexSubImage2D(mFBOTextureTarget,
0, // level
0, 0, // offset
aRect.x, aRect.y,
aRect.width, aRect.height);
buf);
}
} else {
mGLContext->fTexImage2D(mFBOTextureTarget,