1// Copyright 2020 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "tools/fiddle/examples.h"
4REG_FIDDLE_SRGB(gpu4444diff, 260, 260, false, 3, 0, false) {
5void draw(SkCanvas* canvas) {
6    canvas->scale(16, 16);
7    SkBitmap bitmap;
8    SkImageInfo imageInfo = SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType);
9    bitmap.allocPixels(imageInfo);
10    SkCanvas offscreen(bitmap);
11    offscreen.clear(SK_ColorGREEN);
12    canvas->drawImage(bitmap.asImage(), 0, 0);
13    offscreen.clear(SK_ColorGRAY);
14    canvas->drawImage(bitmap.asImage(), 2, 2);
15    auto pack4444 = [](unsigned a, unsigned r, unsigned g, unsigned b) -> uint16_t {
16        return (a << 0) | (b << 4) | (g << 8) | (r << 12);
17    };
18    uint16_t red4444[] = { pack4444(0xF, 0xF, 0x0, 0x0), pack4444(0xF, 0xb, 0x0, 0x0),
19                           pack4444(0xF, 0x9, 0x0, 0x0), pack4444(0xF, 0x5, 0x0, 0x0) };
20    uint16_t blue4444[] = { pack4444(0xF, 0x0, 0x0, 0x0F), pack4444(0xF, 0x0, 0x0, 0x0b),
21                            pack4444(0xF, 0x0, 0x0, 0x09), pack4444(0xF, 0x0, 0x0, 0x05) };
22    SkImageInfo pixInfo = SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType);
23    SkPixmap redPixmap(imageInfo, &red4444, 4);
24    if (bitmap.writePixels(redPixmap, 0, 0)) {
25        canvas->drawImage(bitmap.asImage(), 4, 4);
26    }
27    SkPixmap bluePixmap(imageInfo, &blue4444, 4);
28    if (bitmap.writePixels(bluePixmap, 0, 0)) {
29        canvas->drawImage(bitmap.asImage(), 6, 6);
30    }
31}
32}  // END FIDDLE
33