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=086866243bf9e4c14c3b215a2aa69ad9
5REG_FIDDLE(Pixmap_writable_addr32, 256, 72, false, 4) {
6void draw(SkCanvas* canvas) {
7    std::vector<int32_t> pixels;
8    pixels.resize(image->height() * image->width() * 4);
9    SkPixmap pixmap(SkImageInfo::Make(image->width(), image->height(), kN32_SkColorType,
10            image->alphaType()), (const void*) &pixels.front(), image->width() * 4);
11    image->readPixels(nullptr, pixmap, 0, 0);
12    for (int y = 0; y < pixmap.height() / 2; ++y) {
13        for (int x = 0; x < pixmap.width(); ++x) {
14            if ((x & 4) == (y & 4)) {
15                *pixmap.writable_addr32(x, y) =
16                        *pixmap.writable_addr32(pixmap.width() - x - 1, pixmap.height() - y - 1);
17            }
18        }
19    }
20    SkBitmap bitmap;
21    bitmap.installPixels(pixmap);
22    canvas->drawImage(bitmap.asImage(), 0, 0);
23}
24}  // END FIDDLE
25