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
5 REG_FIDDLE(Image_readPixels_2, 256, 256, false, 3) {
draw(SkCanvas * canvas)6 void 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