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 #include "sk_tool_utils.h" 10 11 #include "Resources.h" 12 #include "SkCanvas.h" 13 #include "SkOSFile.h" 14 15 namespace skiagm { 16 17 /** 18 * Test copying an image from 8888 to 4444. 19 */ 20 class CopyTo4444GM : public GM { 21 public: CopyTo4444GM()22 CopyTo4444GM() {} 23 24 protected: onShortName()25 virtual SkString onShortName() { 26 return SkString("copyTo4444"); 27 } 28 onISize()29 virtual SkISize onISize() { 30 return SkISize::Make(360, 180); 31 } 32 onDraw(SkCanvas * canvas)33 virtual void onDraw(SkCanvas* canvas) { 34 SkBitmap bm, bm4444; 35 if (!GetResourceAsBitmap("images/dog.jpg", &bm)) { 36 SkDebugf("Could not decode the file. Did you forget to set the " 37 "resourcePath?\n"); 38 return; 39 } 40 canvas->drawBitmap(bm, 0, 0); 41 42 // This should dither or we will see artifacts in the background of the image. 43 SkAssertResult(sk_tool_utils::copy_to(&bm4444, kARGB_4444_SkColorType, bm)); 44 canvas->drawBitmap(bm4444, SkIntToScalar(bm.width()), 0); 45 } 46 47 private: 48 typedef GM INHERITED; 49 }; 50 51 ////////////////////////////////////////////////////////////////////////////// 52 53 DEF_GM( return new CopyTo4444GM; ) 54 55 } 56 57 DEF_SIMPLE_GM(format4444, canvas, 64, 64) { 58 canvas->scale(16, 16); 59 SkBitmap bitmap; 60 SkImageInfo imageInfo = SkImageInfo::Make(1, 1, kARGB_4444_SkColorType, kPremul_SkAlphaType); 61 bitmap.allocPixels(imageInfo); 62 SkCanvas offscreen(bitmap); 63 offscreen.clear(SK_ColorRED); 64 canvas->drawBitmap(bitmap, 0, 0); 65 offscreen.clear(SK_ColorBLUE); 66 canvas->drawBitmap(bitmap, 1, 1); __anon252da6a80102(unsigned a, unsigned r, unsigned g, unsigned b) 67 auto pack4444 = [](unsigned a, unsigned r, unsigned g, unsigned b) -> uint16_t { 68 return (a << 0) | (b << 4) | (g << 8) | (r << 12); 69 }; 70 uint16_t red4444 = pack4444(0xF, 0xF, 0x0, 0x0); 71 uint16_t blue4444 = pack4444(0xF, 0x0, 0x0, 0x0F); 72 SkPixmap redPixmap(imageInfo, &red4444, 2); 73 if (bitmap.writePixels(redPixmap, 0, 0)) { 74 canvas->drawBitmap(bitmap, 2, 2); 75 } 76 SkPixmap bluePixmap(imageInfo, &blue4444, 2); 77 if (bitmap.writePixels(bluePixmap, 0, 0)) { 78 canvas->drawBitmap(bitmap, 3, 3); 79 } 80 } 81
