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