1 /* 2 * Copyright 2013 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.h" 9 10 #include "SkImage.h" 11 #include "SkImageSource.h" 12 13 // This GM exercises the SkImageSource ImageFilter class. 14 15 class ImageSourceGM : public skiagm::GM { 16 public: ImageSourceGM()17 ImageSourceGM() { } 18 19 protected: onShortName()20 SkString onShortName() override { 21 return SkString("imagesource"); 22 } 23 onISize()24 SkISize onISize() override { return SkISize::Make(500, 150); } 25 onOnceBeforeDraw()26 void onOnceBeforeDraw() override { 27 SkBitmap bm = sk_tool_utils::create_string_bitmap(100, 100, 0xFFFFFFFF, 20, 70, 96, "e"); 28 fImage.reset(SkImage::NewFromBitmap(bm)); 29 } 30 FillRectFiltered(SkCanvas * canvas,const SkRect & clipRect,SkImageFilter * filter)31 static void FillRectFiltered(SkCanvas* canvas, const SkRect& clipRect, SkImageFilter* filter) { 32 SkPaint paint; 33 paint.setImageFilter(filter); 34 canvas->save(); 35 canvas->clipRect(clipRect); 36 canvas->drawPaint(paint); 37 canvas->restore(); 38 } 39 onDraw(SkCanvas * canvas)40 void onDraw(SkCanvas* canvas) override { 41 canvas->clear(SK_ColorBLACK); 42 { 43 SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30); 44 SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60); 45 SkRect clipRect = SkRect::MakeXYWH(0, 0, 100, 100); 46 SkRect bounds = SkRect::MakeIWH(fImage->width(), fImage->height()); 47 SkAutoTUnref<SkImageFilter> imageSource(SkImageSource::Create(fImage)); 48 SkAutoTUnref<SkImageFilter> imageSourceSrcRect( 49 SkImageSource::Create(fImage, srcRect, srcRect, kHigh_SkFilterQuality)); 50 SkAutoTUnref<SkImageFilter> imageSourceSrcRectDstRect( 51 SkImageSource::Create(fImage, srcRect, dstRect, kHigh_SkFilterQuality)); 52 SkAutoTUnref<SkImageFilter> imageSourceDstRectOnly( 53 SkImageSource::Create(fImage, bounds, dstRect, kHigh_SkFilterQuality)); 54 55 // Draw an unscaled bitmap. 56 FillRectFiltered(canvas, clipRect, imageSource); 57 canvas->translate(SkIntToScalar(100), 0); 58 59 // Draw an unscaled subset of the source bitmap (srcRect -> srcRect). 60 FillRectFiltered(canvas, clipRect, imageSourceSrcRect); 61 canvas->translate(SkIntToScalar(100), 0); 62 63 // Draw a subset of the bitmap scaled to a destination rect (srcRect -> dstRect). 64 FillRectFiltered(canvas, clipRect, imageSourceSrcRectDstRect); 65 canvas->translate(SkIntToScalar(100), 0); 66 67 // Draw the entire bitmap scaled to a destination rect (bounds -> dstRect). 68 FillRectFiltered(canvas, clipRect, imageSourceDstRectOnly); 69 canvas->translate(SkIntToScalar(100), 0); 70 } 71 } 72 73 private: 74 SkAutoTUnref<SkImage> fImage; 75 typedef GM INHERITED; 76 }; 77 78 /////////////////////////////////////////////////////////////////////////////// 79 80 DEF_GM( return new ImageSourceGM; ) 81