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