1/*
2 * Copyright 2018 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
8in half4x4 gradientMatrix;
9
10@coordTransform {
11    gradientMatrix
12}
13
14void main() {
15    half t = length(sk_TransformedCoords2D[0]);
16    sk_OutColor = half4(t, 1, 0, 0); // y = 1 for always valid
17}
18
19//////////////////////////////////////////////////////////////////////////////
20
21@header {
22    #include "SkRadialGradient.h"
23    #include "GrGradientShader.h"
24}
25
26// The radial gradient never rejects a pixel so it doesn't change opacity
27@optimizationFlags {
28    kPreservesOpaqueInput_OptimizationFlag
29}
30
31@make {
32    static std::unique_ptr<GrFragmentProcessor> Make(const SkRadialGradient& gradient,
33                                                     const GrFPArgs& args);
34}
35
36@cppEnd {
37    std::unique_ptr<GrFragmentProcessor> GrRadialGradientLayout::Make(
38            const SkRadialGradient& grad, const GrFPArgs& args) {
39        SkMatrix matrix;
40        if (!grad.totalLocalMatrix(args.fPreLocalMatrix, args.fPostLocalMatrix)->invert(&matrix)) {
41            return nullptr;
42        }
43        matrix.postConcat(grad.getGradientMatrix());
44        return std::unique_ptr<GrFragmentProcessor>(new GrRadialGradientLayout(matrix));
45    }
46}
47
48//////////////////////////////////////////////////////////////////////////////
49
50@test(d) {
51    SkScalar scale = GrGradientShader::RandomParams::kGradientScale;
52    sk_sp<SkShader> shader;
53    do {
54        GrGradientShader::RandomParams params(d->fRandom);
55        SkPoint center = {d->fRandom->nextRangeScalar(0.0f, scale),
56                          d->fRandom->nextRangeScalar(0.0f, scale)};
57        SkScalar radius = d->fRandom->nextRangeScalar(0.0f, scale);
58        shader = params.fUseColors4f
59                         ? SkGradientShader::MakeRadial(center, radius, params.fColors4f,
60                                                        params.fColorSpace, params.fStops,
61                                                        params.fColorCount, params.fTileMode)
62                         : SkGradientShader::MakeRadial(center, radius, params.fColors,
63                                                        params.fStops, params.fColorCount,
64                                                        params.fTileMode);
65    } while (!shader);
66    GrTest::TestAsFPArgs asFPArgs(d);
67    std::unique_ptr<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args());
68    GrAlwaysAssert(fp);
69    return fp;
70}
71