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
100 lines
3.5 KiB
C++
100 lines
3.5 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 "SkGradientShader.h"
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using namespace skiagm;
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struct GradData {
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int fCount;
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const SkColor* fColors;
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const SkScalar* fPos;
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};
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constexpr SkColor gColors[] = {
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK,
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};
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//constexpr SkScalar gPos[] = { SK_Scalar1*999/2000, SK_Scalar1*1001/2000 };
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constexpr GradData gGradData[] = {
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{ 40, gColors, nullptr },
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// { 2, gColors, gPos },
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// { 2, gCol2, nullptr },
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};
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static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
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}
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static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
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const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
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return SkGradientShader::MakeRadial(pt, pt.fX, data.fColors, data.fPos, data.fCount, tm);
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}
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static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
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const SkPoint pt{ SkScalarAve(pts[0].fX, pts[1].fX), SkScalarAve(pts[0].fY, pts[1].fY) };
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return SkGradientShader::MakeSweep(pt.fX, pt.fY, data.fColors, data.fPos, data.fCount);
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}
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typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkShader::TileMode);
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constexpr GradMaker gGradMakers[] = {
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MakeLinear, MakeRadial, MakeSweep,
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};
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///////////////////////////////////////////////////////////////////////////////
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class GradientsGM : public GM {
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public:
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GradientsGM() {
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this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
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}
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protected:
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SkString onShortName() override { return SkString("gradient_dirty_laundry"); }
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SkISize onISize() override { return SkISize::Make(640, 615); }
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void onDraw(SkCanvas* canvas) override {
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SkPoint pts[2] = { { 0, 0 },
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{ SkIntToScalar(100), SkIntToScalar(100) }
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};
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SkShader::TileMode tm = SkShader::kClamp_TileMode;
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SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
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SkPaint paint;
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paint.setAntiAlias(true);
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canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
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for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
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canvas->save();
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for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
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paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
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canvas->drawRect(r, paint);
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canvas->translate(0, SkIntToScalar(120));
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}
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canvas->restore();
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canvas->translate(SkIntToScalar(120), 0);
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}
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}
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private:
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typedef GM INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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static GM* MyFactory(void*) { return new GradientsGM; }
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static GMRegistry reg(MyFactory);
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