Пример #1
0
SkPDFAlphaFunctionShader::SkPDFAlphaFunctionShader(SkPDFShader::State* state)
        : fState(state) {
    SkRect bbox;
    bbox.set(fState.get()->fBBox);

    fColorShader.reset(
            SkPDFShader::GetPDFShaderByState(state->CreateOpaqueState()));

    // Create resource dict with alpha graphics state as G0 and
    // pattern shader as P0, then write content stream.
    SkAutoTUnref<SkPDFGraphicState> alphaGs(CreateSMaskGraphicState());
    fResourceDict.reset(
            get_gradient_resource_dict(fColorShader.get(), alphaGs.get()));

    SkAutoTUnref<SkStream> colorStream(
            create_pattern_fill_content(0, bbox));
    setData(colorStream.get());

    populate_tiling_pattern_dict(this, bbox, fResourceDict.get(),
                                 SkMatrix::I());
}
Пример #2
0
SkPDFAlphaFunctionShader* SkPDFAlphaFunctionShader::Create(
        SkPDFCanon* canon,
        SkScalar dpi,
        SkAutoTDelete<SkPDFShader::State>* autoState) {
    const SkPDFShader::State& state = **autoState;
    SkRect bbox;
    bbox.set(state.fBBox);

    SkAutoTDelete<SkPDFShader::State> opaqueState(state.CreateOpaqueState());

    SkAutoTUnref<SkPDFObject> colorShader(
            get_pdf_shader_by_state(canon, dpi, &opaqueState));
    if (!colorShader) {
        return NULL;
    }

    // Create resource dict with alpha graphics state as G0 and
    // pattern shader as P0, then write content stream.
    SkAutoTUnref<SkPDFObject> alphaGs(
            create_smask_graphic_state(canon, dpi, state));

    SkPDFAlphaFunctionShader* alphaFunctionShader =
            SkNEW_ARGS(SkPDFAlphaFunctionShader, (autoState->detach()));

    SkAutoTUnref<SkPDFDict> resourceDict(
            get_gradient_resource_dict(colorShader.get(), alphaGs.get()));

    SkAutoTDelete<SkStream> colorStream(
            create_pattern_fill_content(0, bbox));
    alphaFunctionShader->setData(colorStream.get());

    populate_tiling_pattern_dict(alphaFunctionShader, bbox, resourceDict.get(),
                                 SkMatrix::I());
    canon->addAlphaShader(alphaFunctionShader);
    return alphaFunctionShader;
}