| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkGradientShader.h" |
| |
| class AlphaGradientsGM : public skiagm::GM { |
| public: |
| AlphaGradientsGM() {} |
| |
| protected: |
| SkString getName() const override { return SkString("alphagradients"); } |
| |
| SkISize getISize() override { return SkISize::Make(640, 480); } |
| |
| static void draw_grad(SkCanvas* canvas, const SkRect& r, |
| SkColor c0, SkColor c1, bool doPreMul) { |
| SkColor colors[] = { c0, c1 }; |
| SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fBottom } }; |
| SkPaint paint; |
| uint32_t flags = doPreMul ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0; |
| paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, |
| SkTileMode::kClamp, flags, nullptr)); |
| canvas->drawRect(r, paint); |
| |
| paint.setShader(nullptr); |
| paint.setStyle(SkPaint::kStroke_Style); |
| canvas->drawRect(r, paint); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| constexpr struct { |
| SkColor fColor0; |
| SkColor fColor1; |
| } gRec[] = { |
| { 0xFFFFFFFF, 0x00000000 }, |
| { 0xFFFFFFFF, 0x00FF0000 }, |
| { 0xFFFFFFFF, 0x00FFFF00 }, |
| { 0xFFFFFFFF, 0x00FFFFFF }, |
| { 0xFFFF0000, 0x00000000 }, |
| { 0xFFFF0000, 0x00FF0000 }, |
| { 0xFFFF0000, 0x00FFFF00 }, |
| { 0xFFFF0000, 0x00FFFFFF }, |
| { 0xFF0000FF, 0x00000000 }, |
| { 0xFF0000FF, 0x00FF0000 }, |
| { 0xFF0000FF, 0x00FFFF00 }, |
| { 0xFF0000FF, 0x00FFFFFF }, |
| }; |
| |
| SkRect r = SkRect::MakeWH(300, 30); |
| |
| canvas->translate(10, 10); |
| |
| for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) { |
| canvas->save(); |
| for (size_t i = 0; i < std::size(gRec); ++i) { |
| draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul)); |
| canvas->translate(0, r.height() + 8); |
| } |
| canvas->restore(); |
| canvas->translate(r.width() + 10, 0); |
| } |
| } |
| |
| private: |
| using INHERITED = skiagm::GM; |
| }; |
| |
| DEF_GM(return new AlphaGradientsGM;) |