2 * Copyright 2012 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #include "SkGradientShader.h"
13 static sk_sp<SkShader> MakeLinear(SkScalar width, SkScalar height, bool alternate,
14 const SkMatrix& localMatrix) {
15 SkPoint pts[2] = { {0, 0}, {width, height}};
16 SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
19 colors[0] = SK_ColorBLUE;
20 colors[1] = SK_ColorYELLOW;
22 return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode,
26 ///////////////////////////////////////////////////////////////////////////////
28 class ShaderBoundsGM : public GM {
30 typedef sk_sp<SkShader> (*ShaderGenFunc)(SkScalar width, SkScalar height,
31 bool alternate, const SkMatrix& localMatrix);
32 ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
33 : fShaderMaker(maker),
39 SkString onShortName() override {
43 SkISize onISize() override { return SkISize::Make(320, 240); }
45 SkMatrix onGetInitialTransform() const override {
47 SkScalar scale = 0.8f;
48 result.setScale(scale, scale);
49 result.postTranslate(SkIntToScalar(7), SkIntToScalar(23));
53 void onDraw(SkCanvas* canvas) override {
54 // The PDF device has already clipped to the content area, but we
55 // do it again here so that the raster and pdf results are consistent.
56 canvas->clipRect(SkRect::MakeWH(SkIntToScalar(320),
60 SkScalar scale = 0.7f;
61 canvasScale.setScale(scale, scale);
62 canvas->concat(canvasScale);
66 paint.setShader(MakeShader(559, 387, false));
67 SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41),
68 SkIntToScalar(571), SkIntToScalar(428));
69 canvas->drawRect(r, paint);
71 // Constrained shader.
72 paint.setShader(MakeShader(101, 151, true));
73 r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71),
74 SkIntToScalar(101), SkIntToScalar(151));
76 canvas->drawRect(r, paint);
79 sk_sp<SkShader> MakeShader(int width, int height, bool background) {
80 SkScalar scale = 0.5f;
84 SkScalar shaderWidth = width / scale;
85 SkScalar shaderHeight = height / scale;
86 SkMatrix shaderScale = SkMatrix::MakeScale(scale);
87 return fShaderMaker(shaderWidth, shaderHeight, background, shaderScale);
93 ShaderGenFunc fShaderMaker;
96 sk_sp<SkShader> MakeShader(bool background);
99 ///////////////////////////////////////////////////////////////////////////////
101 static GM* MyFactory(void*) {
102 return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear"));
104 static GMRegistry reg(MyFactory);