1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "gm.h" 9 #include "SkBitmap.h" 10 #include "SkCanvas.h" 11 #include "SkDevice.h" 12 #include "SkString.h" 13 14 namespace skiagm { 15 16 static void create_bitmap(SkBitmap* bitmap) { 17 const int W = 100; 18 const int H = 100; 19 bitmap->setConfig(SkBitmap::kARGB_8888_Config, W, H); 20 bitmap->allocPixels(); 21 22 SkCanvas canvas(*bitmap); 23 canvas.drawColor(SK_ColorRED); 24 SkPaint paint; 25 paint.setColor(SK_ColorBLUE); 26 canvas.drawCircle(SkIntToScalar(W)/2, SkIntToScalar(H)/2, SkIntToScalar(W)/2, paint); 27 } 28 29 class ExtractBitmapGM : public GM { 30 public: 31 ExtractBitmapGM() {} 32 33 protected: 34 // overrides from SkEventSink 35 virtual SkString onShortName() SK_OVERRIDE { 36 return SkString("extractbitmap"); 37 } 38 39 virtual SkISize onISize() SK_OVERRIDE { 40 return make_isize(600, 600); 41 } 42 43 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { 44 SkBitmap bitmap; 45 create_bitmap(&bitmap); 46 int x = bitmap.width() / 2; 47 int y = bitmap.height() / 2; 48 49 canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); 50 51 canvas->drawBitmap(bitmap, 0, 0); 52 53 { 54 // Do some subset drawing. This will test that an SkGPipe properly 55 // handles the case where bitmaps share a pixelref 56 // Draw the bottom right fourth of the bitmap over the top left 57 SkBitmap subset; 58 bitmap.extractSubset(&subset, SkIRect::MakeXYWH(x, y, x, y)); 59 canvas->drawBitmap(subset, 0, 0); 60 // Draw the top left corner over the bottom right 61 bitmap.extractSubset(&subset, SkIRect::MakeWH(x, y)); 62 canvas->drawBitmap(subset, SkIntToScalar(x), SkIntToScalar(y)); 63 // Draw a subset which has the same height and pixelref offset but a 64 // different width 65 bitmap.extractSubset(&subset, SkIRect::MakeWH(x, bitmap.height())); 66 SkAutoCanvasRestore autoRestore(canvas, true); 67 canvas->translate(0, SkIntToScalar(bitmap.height() + 20)); 68 canvas->drawBitmap(subset, 0, 0); 69 // Now draw a subet which has the same width and pixelref offset but 70 // a different height 71 bitmap.extractSubset(&subset, SkIRect::MakeWH(bitmap.height(), y)); 72 canvas->translate(0, SkIntToScalar(bitmap.height() + 20)); 73 canvas->drawBitmap(subset, 0, 0); 74 } 75 76 // Now do the same but with a device bitmap as source image 77 SkAutoTUnref<SkDevice> secondDevice(canvas->createCompatibleDevice( 78 SkBitmap::kARGB_8888_Config, bitmap.width(), 79 bitmap.height(), true)); 80 SkCanvas secondCanvas(secondDevice.get()); 81 secondCanvas.writePixels(bitmap, 0, 0); 82 83 SkBitmap deviceBitmap = secondDevice->accessBitmap(false); 84 SkBitmap deviceSubset; 85 deviceBitmap.extractSubset(&deviceSubset, 86 SkIRect::MakeXYWH(x, y, x, y)); 87 88 canvas->translate(SkIntToScalar(120), SkIntToScalar(0)); 89 90 canvas->drawBitmap(deviceBitmap, 0, 0); 91 canvas->drawBitmap(deviceSubset, 0, 0); 92 93 } 94 95 private: 96 typedef GM INHERITED; 97 }; 98 99 ////////////////////////////////////////////////////////////////////////////// 100 101 static GM* MyFactory(void*) { return new ExtractBitmapGM; } 102 static GMRegistry reg(MyFactory); 103 104 } 105
