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