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 static GM* MyFactory(void*) { return new CopyTo4444GM; }
54 static GMRegistry reg(MyFactory);
55 
56 }
57 
58 DEF_SIMPLE_GM(format4444, canvas, 64, 64) {
59     canvas->scale(16, 16);
60     SkBitmap bitmap;
61     SkImageInfo imageInfo = SkImageInfo::Make(1, 1, kARGB_4444_SkColorType, kPremul_SkAlphaType);
62     bitmap.allocPixels(imageInfo);
63     SkCanvas offscreen(bitmap);
64     offscreen.clear(SK_ColorRED);
65     canvas->drawBitmap(bitmap, 0, 0);
66     offscreen.clear(SK_ColorBLUE);
67     canvas->drawBitmap(bitmap, 1, 1);
68     auto pack4444 = [](unsigned a, unsigned r, unsigned g, unsigned b) -> uint16_t {
69         return (a << 0) | (b << 4) | (g << 8) | (r << 12);
70     };
71     uint16_t red4444 = pack4444(0xF, 0xF, 0x0, 0x0);
72     uint16_t blue4444 = pack4444(0xF, 0x0, 0x0, 0x0F);
73     SkPixmap redPixmap(imageInfo, &red4444, 2);
74     if (bitmap.writePixels(redPixmap, 0, 0)) {
75         canvas->drawBitmap(bitmap, 2, 2);
76     }
77     SkPixmap bluePixmap(imageInfo, &blue4444, 2);
78     if (bitmap.writePixels(bluePixmap, 0, 0)) {
79         canvas->drawBitmap(bitmap, 3, 3);
80     }
81 }
82