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- /*
- * 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 onShortName() override {
- return SkString("alphagradients");
- }
- SkISize onISize() 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 < SK_ARRAY_COUNT(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:
- typedef skiagm::GM INHERITED;
- };
- DEF_GM(return new AlphaGradientsGM;)
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