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=b77a73c4baa63a4a8e2a4fdd96144d0b
5REG_FIDDLE(Image_readPixels_2, 256, 256, false, 3) {
6void draw(SkCanvas* canvas) {
7    std::vector<int32_t> srcPixels;
8    int rowBytes = image->width() * 4;
9    int quarterWidth = image->width() / 4;
10    int quarterHeight = image->height() / 4;
11    srcPixels.resize(image->height() * rowBytes);
12    for (int y = 0; y < 4; ++y) {
13        for (int x = 0; x < 4; ++x) {
14            SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
15                    &srcPixels.front() + x * image->height() * quarterWidth +
16                    y * quarterWidth, rowBytes);
17            image->readPixels(nullptr, pixmap, x * quarterWidth, y * quarterHeight);
18        }
19    }
20    canvas->scale(.5f, .5f);
21    SkBitmap bitmap;
22    bitmap.installPixels(SkImageInfo::MakeN32Premul(image->width(), image->height()),
23                             &srcPixels.front(), rowBytes);
24    canvas->drawImage(bitmap.asImage(), 0, 0);
25}
26}  // END FIDDLE
27