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Fix unbalanced Shader set/endContext calls in drawVertices

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Review URL: https://codereview.appspot.com/7309047

git-svn-id: http://skia.googlecode.com/svn/trunk@7588 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
djsollen@google.com 2013-02-05 17:00:02 +00:00
parent e7767cfca6
commit 19376b8047
1 changed files with 20 additions and 3 deletions
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23
src/core/SkDraw.cpp
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@ -2531,14 +2531,23 @@ void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
savedLocalM = shader->getLocalMatrix();
}
// setContext has already been called and verified to return true
// by the constructor of SkAutoBlitterChoose
bool prevContextSuccess = true;
while (vertProc(&state)) {
if (NULL != textures) {
if (texture_to_matrix(state, vertices, textures, &tempM)) {
tempM.postConcat(savedLocalM);
shader->setLocalMatrix(tempM);
// need to recal setContext since we changed the local matrix
shader->endContext();
if (!shader->setContext(*fBitmap, p, *fMatrix)) {
// Need to recall setContext since we changed the local matrix.
// However, we also need to balance the calls this with a
// call to endContext which requires tracking the result of
// the previous call to setContext.
if (prevContextSuccess) {
shader->endContext();
}
prevContextSuccess = shader->setContext(*fBitmap, p, *fMatrix);
if (!prevContextSuccess) {
continue;
}
}
@ -2555,10 +2564,18 @@ void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
};
SkScan::FillTriangle(tmp, *fRC, blitter.get());
}
// now restore the shader's original local matrix
if (NULL != shader) {
shader->setLocalMatrix(savedLocalM);
}
// If the final call to setContext fails we must make it suceed so that the
// call to endContext in the destructor for SkAutoBlitterChoose is balanced.
if (!prevContextSuccess) {
prevContextSuccess = shader->setContext(*fBitmap, paint, SkMatrix::I());
SkASSERT(prevContextSuccess);
}
} else {
// no colors[] and no texture
HairProc hairProc = ChooseHairProc(paint.isAntiAlias());