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      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:
     22     CopyTo4444GM() {}
     23 
     24 protected:
     25     virtual SkString onShortName() {
     26         return SkString("copyTo4444");
     27     }
     28 
     29     virtual SkISize onISize() {
     30         return SkISize::Make(360, 180);
     31     }
     32 
     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);
     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