/**
* Creates a ExtGState with the SMask set to the luminosityShader in
* luminosity mode. The shader pattern extends to the bbox.
*/
SkPDFGraphicState* SkPDFAlphaFunctionShader::CreateSMaskGraphicState() {
SkRect bbox;
bbox.set(fState.get()->fBBox);
SkAutoTUnref<SkPDFObject> luminosityShader(
SkPDFShader::GetPDFShaderByState(
fState->CreateAlphaToLuminosityState()));
SkAutoTUnref<SkStream> alphaStream(create_pattern_fill_content(-1, bbox));
SkAutoTUnref<SkPDFResourceDict>
resources(get_gradient_resource_dict(luminosityShader, NULL));
SkAutoTUnref<SkPDFFormXObject> alphaMask(
new SkPDFFormXObject(alphaStream.get(), bbox, resources.get()));
return SkPDFGraphicState::GetSMaskGraphicState(
alphaMask.get(), false,
SkPDFGraphicState::kLuminosity_SMaskMode);
}
/**
* Creates a ExtGState with the SMask set to the luminosityShader in
* luminosity mode. The shader pattern extends to the bbox.
*/
static SkPDFObject* create_smask_graphic_state(
SkPDFCanon* canon, SkScalar dpi, const SkPDFShader::State& state) {
SkRect bbox;
bbox.set(state.fBBox);
SkAutoTDelete<SkPDFShader::State> alphaToLuminosityState(
state.CreateAlphaToLuminosityState());
SkAutoTUnref<SkPDFObject> luminosityShader(
get_pdf_shader_by_state(canon, dpi, &alphaToLuminosityState));
SkAutoTDelete<SkStream> alphaStream(create_pattern_fill_content(-1, bbox));
SkAutoTUnref<SkPDFDict>
resources(get_gradient_resource_dict(luminosityShader, NULL));
SkAutoTUnref<SkPDFFormXObject> alphaMask(
new SkPDFFormXObject(alphaStream.get(), bbox, resources.get()));
return SkPDFGraphicState::GetSMaskGraphicState(
alphaMask.get(), false,
SkPDFGraphicState::kLuminosity_SMaskMode);
}
