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
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
/*
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* Copyright 2015 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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namespace skiagm {
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// This GM exercises HighQuality anisotropic filtering.
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class AnisotropicGM : public GM {
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public:
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AnisotropicGM() : fFilterQuality(kHigh_SkFilterQuality) {
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this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
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}
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protected:
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SkString onShortName() override { return SkString("anisotropic_hq"); }
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SkISize onISize() override {
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return SkISize::Make(2*kImageSize + 3*kSpacer,
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kNumVertImages*kImageSize + (kNumVertImages+1)*kSpacer);
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}
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// Create an image consisting of lines radiating from its center
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void onOnceBeforeDraw() override {
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constexpr int kNumLines = 100;
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constexpr SkScalar kAngleStep = 360.0f / kNumLines;
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constexpr int kInnerOffset = 10;
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fBM.allocN32Pixels(kImageSize, kImageSize, true);
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SkCanvas canvas(fBM);
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canvas.clear(SK_ColorWHITE);
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SkPaint p;
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p.setAntiAlias(true);
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SkScalar angle = 0.0f, sin, cos;
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canvas.translate(kImageSize/2.0f, kImageSize/2.0f);
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for (int i = 0; i < kNumLines; ++i, angle += kAngleStep) {
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sin = SkScalarSinCos(angle, &cos);
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canvas.drawLine(cos * kInnerOffset, sin * kInnerOffset,
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cos * kImageSize/2, sin * kImageSize/2, p);
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}
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}
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void draw(SkCanvas* canvas, int x, int y, int xSize, int ySize) {
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SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
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SkIntToScalar(xSize), SkIntToScalar(ySize));
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SkPaint p;
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p.setFilterQuality(fFilterQuality);
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canvas->drawBitmapRect(fBM, r, &p);
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}
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void onDraw(SkCanvas* canvas) override {
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SkScalar gScales[] = { 0.9f, 0.8f, 0.75f, 0.6f, 0.5f, 0.4f, 0.25f, 0.2f, 0.1f };
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SkASSERT(kNumVertImages-1 == (int)SK_ARRAY_COUNT(gScales)/2);
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// Minimize vertically
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for (int i = 0; i < (int)SK_ARRAY_COUNT(gScales); ++i) {
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int height = SkScalarFloorToInt(fBM.height() * gScales[i]);
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int yOff;
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if (i <= (int)SK_ARRAY_COUNT(gScales)/2) {
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yOff = kSpacer + i * (fBM.height() + kSpacer);
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} else {
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// Position the more highly squashed images with their less squashed counterparts
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yOff = (SK_ARRAY_COUNT(gScales) - i) * (fBM.height() + kSpacer) - height;
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}
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this->draw(canvas, kSpacer, yOff, fBM.width(), height);
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}
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// Minimize horizontally
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for (int i = 0; i < (int)SK_ARRAY_COUNT(gScales); ++i) {
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int width = SkScalarFloorToInt(fBM.width() * gScales[i]);
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int xOff, yOff;
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if (i <= (int)SK_ARRAY_COUNT(gScales)/2) {
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xOff = fBM.width() + 2*kSpacer;
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yOff = kSpacer + i * (fBM.height() + kSpacer);
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} else {
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// Position the more highly squashed images with their less squashed counterparts
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xOff = fBM.width() + 2*kSpacer + fBM.width() - width;
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yOff = kSpacer + (SK_ARRAY_COUNT(gScales) - i - 1) * (fBM.height() + kSpacer);
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}
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this->draw(canvas, xOff, yOff, width, fBM.height());
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}
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}
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private:
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static constexpr int kImageSize = 256;
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static constexpr int kSpacer = 10;
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static constexpr int kNumVertImages = 5;
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SkBitmap fBM;
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SkFilterQuality fFilterQuality;
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typedef GM INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new AnisotropicGM;)
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}
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