| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/core/SkRasterPipeline.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkWriteBuffer.h" |
| #include "src/shaders/gradients/SkRadialGradient.h" |
| |
| namespace { |
| |
| SkMatrix rad_to_unit_matrix(const SkPoint& center, SkScalar radius) { |
| SkScalar inv = SkScalarInvert(radius); |
| |
| SkMatrix matrix; |
| matrix.setTranslate(-center.fX, -center.fY); |
| matrix.postScale(inv, inv); |
| return matrix; |
| } |
| |
| } // namespace |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| SkRadialGradient::SkRadialGradient(const SkPoint& center, SkScalar radius, const Descriptor& desc) |
| : SkGradientShaderBase(desc, rad_to_unit_matrix(center, radius)) |
| , fCenter(center) |
| , fRadius(radius) { |
| } |
| |
| SkShader::GradientType SkRadialGradient::asAGradient(GradientInfo* info) const { |
| if (info) { |
| commonAsAGradient(info); |
| info->fPoint[0] = fCenter; |
| info->fRadius[0] = fRadius; |
| } |
| return kRadial_GradientType; |
| } |
| |
| sk_sp<SkFlattenable> SkRadialGradient::CreateProc(SkReadBuffer& buffer) { |
| DescriptorScope desc; |
| if (!desc.unflatten(buffer)) { |
| return nullptr; |
| } |
| const SkPoint center = buffer.readPoint(); |
| const SkScalar radius = buffer.readScalar(); |
| return SkGradientShader::MakeRadial(center, radius, desc.fColors, std::move(desc.fColorSpace), |
| desc.fPos, desc.fCount, desc.fTileMode, desc.fGradFlags, |
| desc.fLocalMatrix); |
| } |
| |
| void SkRadialGradient::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writePoint(fCenter); |
| buffer.writeScalar(fRadius); |
| } |
| |
| void SkRadialGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline* p, |
| SkRasterPipeline*) const { |
| p->append(SkRasterPipeline::xy_to_radius); |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "src/gpu/gradients/GrGradientShader.h" |
| |
| std::unique_ptr<GrFragmentProcessor> SkRadialGradient::asFragmentProcessor( |
| const GrFPArgs& args) const { |
| return GrGradientShader::MakeRadial(*this, args); |
| } |
| |
| #endif |