Index: gm/anisotropic.cpp |
diff --git a/gm/anisotropic.cpp b/gm/anisotropic.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..a004d750e15ef5aebf41c37474318783e7faa72d |
--- /dev/null |
+++ b/gm/anisotropic.cpp |
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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.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 { |
+ static const int kNumLines = 100; |
+ static const SkScalar kAngleStep = 360.0f / kNumLines; |
+ static const 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 = SkScalarSinCos(angle, &cos); |
+ 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 const int kImageSize = 256; |
+ static const int kSpacer = 10; |
+ static const int kNumVertImages = 5; |
+ |
+ SkBitmap fBM; |
+ SkFilterQuality fFilterQuality; |
+ |
+ typedef GM INHERITED; |
+}; |
+ |
+////////////////////////////////////////////////////////////////////////////// |
+ |
+DEF_GM( return SkNEW(AnisotropicGM); ) |
+ |
+} |