1 /*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "src/shaders/gradients/SkRadialGradient.h"
9
10 #include "src/core/SkKeyHelpers.h"
11 #include "src/core/SkRasterPipeline.h"
12 #include "src/core/SkReadBuffer.h"
13 #include "src/core/SkWriteBuffer.h"
14
15 namespace {
16
rad_to_unit_matrix(const SkPoint & center,SkScalar radius)17 SkMatrix rad_to_unit_matrix(const SkPoint& center, SkScalar radius) {
18 SkScalar inv = SkScalarInvert(radius);
19
20 SkMatrix matrix;
21 matrix.setTranslate(-center.fX, -center.fY);
22 matrix.postScale(inv, inv);
23 return matrix;
24 }
25
26 } // namespace
27
28 /////////////////////////////////////////////////////////////////////
29
SkRadialGradient(const SkPoint & center,SkScalar radius,const Descriptor & desc)30 SkRadialGradient::SkRadialGradient(const SkPoint& center, SkScalar radius, const Descriptor& desc)
31 : SkGradientShaderBase(desc, rad_to_unit_matrix(center, radius))
32 , fCenter(center)
33 , fRadius(radius) {
34 }
35
asAGradient(GradientInfo * info) const36 SkShader::GradientType SkRadialGradient::asAGradient(GradientInfo* info) const {
37 if (info) {
38 commonAsAGradient(info);
39 info->fPoint[0] = fCenter;
40 info->fRadius[0] = fRadius;
41 }
42 return kRadial_GradientType;
43 }
44
CreateProc(SkReadBuffer & buffer)45 sk_sp<SkFlattenable> SkRadialGradient::CreateProc(SkReadBuffer& buffer) {
46 DescriptorScope desc;
47 if (!desc.unflatten(buffer)) {
48 return nullptr;
49 }
50 const SkPoint center = buffer.readPoint();
51 const SkScalar radius = buffer.readScalar();
52 return SkGradientShader::MakeRadial(center, radius, desc.fColors, std::move(desc.fColorSpace),
53 desc.fPos, desc.fCount, desc.fTileMode, desc.fGradFlags,
54 desc.fLocalMatrix);
55 }
56
flatten(SkWriteBuffer & buffer) const57 void SkRadialGradient::flatten(SkWriteBuffer& buffer) const {
58 this->INHERITED::flatten(buffer);
59 buffer.writePoint(fCenter);
60 buffer.writeScalar(fRadius);
61 }
62
appendGradientStages(SkArenaAlloc *,SkRasterPipeline * p,SkRasterPipeline *) const63 void SkRadialGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline* p,
64 SkRasterPipeline*) const {
65 p->append(SkRasterPipeline::xy_to_radius);
66 }
67
transformT(skvm::Builder * p,skvm::Uniforms *,skvm::Coord coord,skvm::I32 * mask) const68 skvm::F32 SkRadialGradient::transformT(skvm::Builder* p, skvm::Uniforms*,
69 skvm::Coord coord, skvm::I32* mask) const {
70 return sqrt(coord.x*coord.x + coord.y*coord.y);
71 }
72
73 /////////////////////////////////////////////////////////////////////
74
75 #if SK_SUPPORT_GPU
76
77 #include "src/gpu/gradients/GrGradientShader.h"
78
asFragmentProcessor(const GrFPArgs & args) const79 std::unique_ptr<GrFragmentProcessor> SkRadialGradient::asFragmentProcessor(
80 const GrFPArgs& args) const {
81 return GrGradientShader::MakeRadial(*this, args);
82 }
83
84 #endif
85
addToKey(SkShaderCodeDictionary * dict,SkBackend backend,SkPaintParamsKeyBuilder * builder,SkUniformBlock * uniformBlock) const86 void SkRadialGradient::addToKey(SkShaderCodeDictionary* dict,
87 SkBackend backend,
88 SkPaintParamsKeyBuilder* builder,
89 SkUniformBlock* uniformBlock) const {
90 GradientShaderBlocks::GradientData data(kRadial_GradientType,
91 fCenter, { 0.0f, 0.0f },
92 fRadius, 0.0f,
93 fTileMode,
94 fColorCount,
95 fOrigColors4f,
96 fOrigPos);
97
98 GradientShaderBlocks::AddToKey(dict, backend, builder, uniformBlock, data);
99 }
100