SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst,
const SkPaint& paint,
const SkMatrix& ctm,
SkArenaAlloc* alloc) {
SkColorSpace* dstCS = dst.colorSpace();
SkPM4f paintColor = SkPM4f_from_SkColor(paint.getColor(), dstCS);
auto shader = as_SB(paint.getShader());
SkRasterPipeline_<256> shaderPipeline;
if (!shader) {
// Having no shader makes things nice and easy... just use the paint color.
shaderPipeline.append_uniform_color(alloc, paintColor);
bool is_opaque = paintColor.a() == 1.0f,
is_constant = true;
return SkRasterPipelineBlitter::Create(dst, paint, alloc,
shaderPipeline, nullptr,
is_opaque, is_constant);
}
bool is_opaque = shader->isOpaque() && paintColor.a() == 1.0f;
bool is_constant = shader->isConstant();
// Check whether the shader prefers to run in burst mode.
if (auto* burstCtx = shader->makeBurstPipelineContext(
SkShaderBase::ContextRec(paint, ctm, nullptr, SkShaderBase::ContextRec::kPM4f_DstType,
dstCS), alloc)) {
return SkRasterPipelineBlitter::Create(dst, paint, alloc,
shaderPipeline, burstCtx,
is_opaque, is_constant);
}
if (shader->appendStages(&shaderPipeline, dstCS, alloc, ctm, paint)) {
if (paintColor.a() != 1.0f) {
shaderPipeline.append(SkRasterPipeline::scale_1_float,
alloc->make<float>(paintColor.a()));
}
return SkRasterPipelineBlitter::Create(dst, paint, alloc, shaderPipeline, nullptr,
is_opaque, is_constant);
}
// The shader has opted out of drawing anything.
return alloc->make<SkNullBlitter>();
}
bool SkColorShader::onAppendStages(const StageRec& rec) const {
rec.fPipeline->append_constant_color(rec.fAlloc, SkPM4f_from_SkColor(fColor, rec.fDstCS));
return true;
}
SkBlitter* SkRasterPipelineBlitter::Create(const SkPixmap& dst,
const SkPaint& paint,
const SkMatrix& ctm,
SkArenaAlloc* alloc) {
auto blitter = alloc->make<SkRasterPipelineBlitter>(
dst,
paint.getBlendMode(),
SkPM4f_from_SkColor(paint.getColor(), dst.colorSpace()));
SkBlendMode* blend = &blitter->fBlend;
SkPM4f* paintColor = &blitter->fPaintColor;
SkRasterPipeline* pipeline = &blitter->fShader;
SkShader* shader = paint.getShader();
SkColorFilter* colorFilter = paint.getColorFilter();
// TODO: all temporary
if (!supported(dst.info()) || !SkBlendMode_AppendStages(*blend)) {
return nullptr;
}
bool is_opaque = paintColor->a() == 1.0f,
is_constant = true;
if (shader) {
pipeline->append(SkRasterPipeline::seed_shader, &blitter->fCurrentY);
if (!shader->appendStages(pipeline, dst.colorSpace(), alloc, ctm, paint)) {
return nullptr;
}
if (!is_opaque) {
pipeline->append(SkRasterPipeline::scale_1_float,
&paintColor->fVec[SkPM4f::A]);
}
is_opaque = is_opaque && shader->isOpaque();
is_constant = shader->isConstant();
} else {
pipeline->append(SkRasterPipeline::constant_color, paintColor);
}
if (colorFilter) {
if (!colorFilter->appendStages(pipeline, dst.colorSpace(), alloc, is_opaque)) {
return nullptr;
}
is_opaque = is_opaque && (colorFilter->getFlags() & SkColorFilter::kAlphaUnchanged_Flag);
}
if (is_constant) {
pipeline->append(SkRasterPipeline::store_f32, &paintColor);
pipeline->run(0,1);
*pipeline = SkRasterPipeline();
pipeline->append(SkRasterPipeline::constant_color, paintColor);
is_opaque = paintColor->a() == 1.0f;
}
if (is_opaque && *blend == SkBlendMode::kSrcOver) {
*blend = SkBlendMode::kSrc;
}
if (is_constant && *blend == SkBlendMode::kSrc) {
SkRasterPipeline p;
p.extend(*pipeline);
blitter->fDstPtr = &blitter->fMemsetColor;
blitter->append_store(&p);
p.run(0,1);
blitter->fCanMemsetInBlitH = true;
}
return blitter;
}
