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
15namespace skiagm {
16
17/**
18 *  Test copying an image from 8888 to 4444.
19 */
20class CopyTo4444GM : public GM {
21public:
22    CopyTo4444GM() {}
23
24protected:
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
47private:
48    typedef GM INHERITED;
49};
50
51//////////////////////////////////////////////////////////////////////////////
52
53static GM* MyFactory(void*) { return new CopyTo4444GM; }
54static GMRegistry reg(MyFactory);
55
56}
57
58DEF_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