1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm/gm.h" 9 #include "include/core/SkBitmap.h" 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkColor.h" 12 #include "include/core/SkMatrix.h" 13 #include "include/core/SkPaint.h" 14 #include "include/core/SkShader.h" 15 #include "include/core/SkSize.h" 16 #include "include/core/SkString.h" 17 #include "include/core/SkTileMode.h" 18 19 /*** 20 * 21 * This GM reproduces Skia bug 2904, in which a tiled bitmap shader was failing to draw correctly 22 * when fractional image scaling was ignored by the high quality bitmap scaler. 23 * 24 ***/ 25 26 namespace skiagm { 27 28 class TiledScaledBitmapGM : public GM { 29 public: 30 TiledScaledBitmapGM()31 TiledScaledBitmapGM() { 32 } 33 34 protected: getName() const35 SkString getName() const override { return SkString("tiledscaledbitmap"); } 36 getISize()37 SkISize getISize() override { return SkISize::Make(1016, 616); } 38 make_bm(int width,int height)39 static SkBitmap make_bm(int width, int height) { 40 SkBitmap bm; 41 bm.allocN32Pixels(width, height); 42 bm.eraseColor(SK_ColorTRANSPARENT); 43 SkCanvas canvas(bm); 44 SkPaint paint; 45 paint.setAntiAlias(true); 46 canvas.drawCircle(width/2.f, height/2.f, width/4.f, paint); 47 return bm; 48 } 49 onOnceBeforeDraw()50 void onOnceBeforeDraw() override { 51 fBitmap = make_bm(360, 288); 52 } 53 onDraw(SkCanvas * canvas)54 void onDraw(SkCanvas* canvas) override { 55 SkPaint paint; 56 57 paint.setAntiAlias(true); 58 59 SkMatrix mat; 60 mat.setScale(121.f/360.f, 93.f/288.f); 61 mat.postTranslate(-72, -72); 62 63 paint.setShader(fBitmap.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, 64 SkSamplingOptions(SkCubicResampler::Mitchell()), mat)); 65 canvas->drawRect({ 8, 8, 1008, 608 }, paint); 66 } 67 68 private: 69 SkBitmap fBitmap; 70 71 using INHERITED = GM; 72 }; 73 74 ////////////////////////////////////////////////////////////////////////////// 75 76 DEF_GM(return new TiledScaledBitmapGM;) 77 } // namespace skiagm 78