123 lines
4.1 KiB
C++
123 lines
4.1 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/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkSurface.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() : fSampling(SkCubicResampler::Mitchell()) {
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this->setBGColor(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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auto info = SkImageInfo::MakeN32(kImageSize, kImageSize, kOpaque_SkAlphaType);
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auto surf = SkSurface::MakeRaster(info);
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auto canvas = surf->getCanvas();
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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 = SkScalarSin(angle);
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cos = SkScalarCos(angle);
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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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fImage = surf->makeImageSnapshot();
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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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canvas->drawImageRect(fImage, r, fSampling);
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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(fImage->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 * (fImage->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) * (fImage->height() + kSpacer) - height;
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}
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this->draw(canvas, kSpacer, yOff, fImage->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(fImage->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 = fImage->width() + 2*kSpacer;
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yOff = kSpacer + i * (fImage->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 = fImage->width() + 2*kSpacer + fImage->width() - width;
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yOff = kSpacer + (SK_ARRAY_COUNT(gScales) - i - 1) * (fImage->height() + kSpacer);
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}
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this->draw(canvas, xOff, yOff, width, fImage->height());
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}
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}
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private:
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inline static constexpr int kImageSize = 256;
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inline static constexpr int kSpacer = 10;
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inline static constexpr int kNumVertImages = 5;
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sk_sp<SkImage> fImage;
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SkSamplingOptions fSampling;
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using INHERITED = GM;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_GM(return new AnisotropicGM;)
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} // namespace skiagm
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