dbfd7ab108
'static const' means, there must be at most one of these, and initialize it at compile time if possible or runtime if necessary. This leads to unexpected code execution, and TSAN* will complain about races on the guard variables. Generally 'constexpr' or 'const' are better choices. Neither can cause races: they're either intialized at compile time (constexpr) or intialized each time independently (const). This CL prefers constexpr where possible, and uses const where not. It even prefers constexpr over const where they don't make a difference... I want to have lots of examples of constexpr for people to see and mimic. The scoped-to-class static has nothing to do with any of this, and is not changed. * Not yet on the bots, which use an older TSAN. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2300623005 Review-Url: https://codereview.chromium.org/2300623005
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
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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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