1// Copyright 2019 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"
4// HASH=b2cbbbbcffb618865d8aae3bc04b2a62
5REG_FIDDLE(Bitmap_readPixels, 256, 128, false, 0) {
6void draw(SkCanvas* canvas) {
7    const int width = 256;
8    const int height = 64;
9    SkImageInfo srcInfo = SkImageInfo::MakeN32Premul(width, height);
10    SkColor  gradColors[] = { 0xFFAA3300, 0x7F881122 };
11    SkPoint  gradPoints[] = { { 0, 0 }, { 256, 0 } };
12    SkPaint paint;
13    paint.setShader(SkGradientShader::MakeLinear(gradPoints, gradColors, nullptr,
14                    SK_ARRAY_COUNT(gradColors), SkTileMode::kClamp));
15    SkBitmap bitmap;
16    bitmap.allocPixels(srcInfo);
17    SkCanvas srcCanvas(bitmap);
18    srcCanvas.drawRect(SkRect::MakeWH(width, height), paint);
19    canvas->drawImage(bitmap.asImage(), 0, 0);
20    SkImageInfo dstInfo = srcInfo.makeColorType(kARGB_4444_SkColorType);
21    std::vector<int16_t> dstPixels;
22    dstPixels.resize(height * width);
23    bitmap.readPixels(dstInfo, &dstPixels.front(), width * 2, 0, 0);
24    SkPixmap dstPixmap(dstInfo, &dstPixels.front(), width * 2);
25    bitmap.installPixels(dstPixmap);
26    canvas->drawImage(bitmap.asImage(), 0, 64);
27}
28}  // END FIDDLE
29