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
130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
/*
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* Copyright 2011 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 "SkColorPriv.h"
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#include "SkShader.h"
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constexpr struct {
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SkXfermode::Mode fMode;
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const char* fLabel;
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} gModes[] = {
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{ SkXfermode::kClear_Mode, "Clear" },
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{ SkXfermode::kSrc_Mode, "Src" },
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{ SkXfermode::kDst_Mode, "Dst" },
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{ SkXfermode::kSrcOver_Mode, "SrcOver" },
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{ SkXfermode::kDstOver_Mode, "DstOver" },
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{ SkXfermode::kSrcIn_Mode, "SrcIn" },
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{ SkXfermode::kDstIn_Mode, "DstIn" },
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{ SkXfermode::kSrcOut_Mode, "SrcOut" },
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{ SkXfermode::kDstOut_Mode, "DstOut" },
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{ SkXfermode::kSrcATop_Mode, "SrcATop" },
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{ SkXfermode::kDstATop_Mode, "DstATop" },
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{ SkXfermode::kXor_Mode, "Xor" },
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};
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const int gWidth = 64;
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const int gHeight = 64;
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const SkScalar W = SkIntToScalar(gWidth);
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const SkScalar H = SkIntToScalar(gHeight);
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static SkScalar drawCell(SkCanvas* canvas, sk_sp<SkXfermode> mode, SkAlpha a0, SkAlpha a1) {
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SkPaint paint;
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paint.setAntiAlias(true);
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SkRect r = SkRect::MakeWH(W, H);
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r.inset(W/10, H/10);
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paint.setColor(SK_ColorBLUE);
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paint.setAlpha(a0);
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canvas->drawOval(r, paint);
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paint.setColor(SK_ColorRED);
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paint.setAlpha(a1);
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paint.setXfermode(std::move(mode));
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for (int angle = 0; angle < 24; ++angle) {
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SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
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SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
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paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
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canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
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}
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return H;
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}
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static sk_sp<SkShader> make_bg_shader() {
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SkBitmap bm;
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bm.allocN32Pixels(2, 2);
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*bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
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*bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE, 0xCF, 0xCE);
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SkMatrix m;
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m.setScale(SkIntToScalar(6), SkIntToScalar(6));
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return SkShader::MakeBitmapShader(bm,
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SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &m);
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}
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namespace skiagm {
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class HairModesGM : public GM {
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SkPaint fBGPaint;
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protected:
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SkString onShortName() override {
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return SkString("hairmodes");
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}
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virtual SkISize onISize() override { return SkISize::Make(640, 480); }
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void onOnceBeforeDraw() override {
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fBGPaint.setShader(make_bg_shader());
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}
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void onDraw(SkCanvas* canvas) override {
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const SkRect bounds = SkRect::MakeWH(W, H);
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constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
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canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
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for (int alpha = 0; alpha < 4; ++alpha) {
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canvas->save();
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canvas->save();
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for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
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if (6 == i) {
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canvas->restore();
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canvas->translate(W * 5, 0);
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canvas->save();
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}
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canvas->drawRect(bounds, fBGPaint);
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canvas->saveLayer(&bounds, nullptr);
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SkScalar dy = drawCell(canvas, SkXfermode::Make(gModes[i].fMode),
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gAlphaValue[alpha & 1],
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gAlphaValue[alpha & 2]);
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canvas->restore();
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canvas->translate(0, dy * 5 / 4);
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}
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canvas->restore();
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canvas->restore();
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canvas->translate(W * 5 / 4, 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 HairModesGM; }
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static GMRegistry reg(MyFactory);
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}
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