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/core/SkRasterPipeline.h"
9#include "src/core/SkReadBuffer.h"
10#include "src/core/SkWriteBuffer.h"
11#include "src/shaders/gradients/SkRadialGradient.h"
12
13namespace {
14
15SkMatrix rad_to_unit_matrix(const SkPoint& center, SkScalar radius) {
16 SkScalar inv = SkScalarInvert(radius);
17
18 SkMatrix matrix;
19 matrix.setTranslate(-center.fX, -center.fY);
20 matrix.postScale(inv, inv);
21 return matrix;
22}
23
24} // namespace
25
26/////////////////////////////////////////////////////////////////////
27
28SkRadialGradient::SkRadialGradient(const SkPoint& center, SkScalar radius, const Descriptor& desc)
29 : SkGradientShaderBase(desc, rad_to_unit_matrix(center, radius))
30 , fCenter(center)
31 , fRadius(radius) {
32}
33
34SkShader::GradientType SkRadialGradient::asAGradient(GradientInfo* info) const {
35 if (info) {
36 commonAsAGradient(info);
37 info->fPoint[0] = fCenter;
38 info->fRadius[0] = fRadius;
39 }
40 return kRadial_GradientType;
41}
42
43sk_sp<SkFlattenable> SkRadialGradient::CreateProc(SkReadBuffer& buffer) {
44 DescriptorScope desc;
45 if (!desc.unflatten(buffer)) {
46 return nullptr;
47 }
48 const SkPoint center = buffer.readPoint();
49 const SkScalar radius = buffer.readScalar();
50 return SkGradientShader::MakeRadial(center, radius, desc.fColors, std::move(desc.fColorSpace),
51 desc.fPos, desc.fCount, desc.fTileMode, desc.fGradFlags,
52 desc.fLocalMatrix);
53}
54
55void SkRadialGradient::flatten(SkWriteBuffer& buffer) const {
56 this->INHERITED::flatten(buffer);
57 buffer.writePoint(fCenter);
58 buffer.writeScalar(fRadius);
59}
60
61void SkRadialGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline* p,
62 SkRasterPipeline*) const {
63 p->append(SkRasterPipeline::xy_to_radius);
64}
65
66skvm::F32 SkRadialGradient::transformT(skvm::Builder* p, skvm::Uniforms*,
67 skvm::Coord coord, skvm::I32* mask) const {
68 return sqrt(coord.x*coord.x + coord.y*coord.y);
69}
70
71/////////////////////////////////////////////////////////////////////
72
73#if SK_SUPPORT_GPU
74
75#include "src/gpu/gradients/GrGradientShader.h"
76
77std::unique_ptr<GrFragmentProcessor> SkRadialGradient::asFragmentProcessor(
78 const GrFPArgs& args) const {
79 return GrGradientShader::MakeRadial(*this, args);
80}
81
82#endif
83