| /* |
| * 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 "gm.h" |
| #include "SkGradientShader.h" |
| |
| namespace skiagm { |
| |
| static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate, |
| const SkMatrix& localMatrix) { |
| SkPoint pts[2] = { {0, 0}, {width, height}}; |
| SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN}; |
| if (alternate) { |
| pts[1].fY = 0; |
| colors[0] = SK_ColorBLUE; |
| colors[1] = SK_ColorYELLOW; |
| } |
| return SkGradientShader::CreateLinear(pts, colors, NULL, 2, |
| SkShader::kClamp_TileMode, 0, &localMatrix); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class ShaderBoundsGM : public GM { |
| public: |
| typedef SkShader* (*ShaderGenFunc)(SkScalar width, SkScalar height, |
| bool alternate, const SkMatrix& localMatrix); |
| ShaderBoundsGM(ShaderGenFunc maker, const SkString& name) |
| : fShaderMaker(maker), |
| fName(name) { |
| } |
| |
| protected: |
| uint32_t onGetFlags() const SK_OVERRIDE { |
| return kSkipTiled_Flag; |
| } |
| |
| SkString onShortName() SK_OVERRIDE { |
| return fName; |
| } |
| |
| SkISize onISize() SK_OVERRIDE { return SkISize::Make(320, 240); } |
| |
| SkMatrix onGetInitialTransform() const SK_OVERRIDE { |
| SkMatrix result; |
| SkScalar scale = 0.8f; |
| result.setScale(scale, scale); |
| result.postTranslate(SkIntToScalar(7), SkIntToScalar(23)); |
| return result; |
| } |
| |
| void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| // The PDF device has already clipped to the content area, but we |
| // do it again here so that the raster and pdf results are consistent. |
| canvas->clipRect(SkRect::MakeWH(SkIntToScalar(320), |
| SkIntToScalar(240))); |
| |
| SkMatrix canvasScale; |
| SkScalar scale = 0.7f; |
| canvasScale.setScale(scale, scale); |
| canvas->concat(canvasScale); |
| |
| // Background shader. |
| SkPaint paint; |
| paint.setShader(MakeShader(559, 387, false))->unref(); |
| SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41), |
| SkIntToScalar(571), SkIntToScalar(428)); |
| canvas->drawRect(r, paint); |
| |
| // Constrained shader. |
| paint.setShader(MakeShader(101, 151, true))->unref(); |
| r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71), |
| SkIntToScalar(101), SkIntToScalar(151)); |
| canvas->clipRect(r); |
| canvas->drawRect(r, paint); |
| } |
| |
| SkShader* MakeShader(int width, int height, bool background) { |
| SkScalar scale = 0.5f; |
| if (background) { |
| scale = 0.6f; |
| } |
| SkScalar shaderWidth = SkScalarDiv(SkIntToScalar(width), scale); |
| SkScalar shaderHeight = SkScalarDiv(SkIntToScalar(height), scale); |
| SkMatrix shaderScale; |
| shaderScale.setScale(scale, scale); |
| SkShader* shader = fShaderMaker(shaderWidth, shaderHeight, background, shaderScale); |
| return shader; |
| } |
| |
| private: |
| typedef GM INHERITED; |
| |
| ShaderGenFunc fShaderMaker; |
| SkString fName; |
| |
| SkShader* MakeShader(bool background); |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static GM* MyFactory(void*) { |
| return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear")); |
| } |
| static GMRegistry reg(MyFactory); |
| |
| } |