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(Bitmap_readPixels_2, 256, 256, false, 3) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 std::vector<int32_t> srcPixels;
7 srcPixels.resize(source.height() * source.rowBytes());
8 for (int y = 0; y < 4; ++y) {
9 for (int x = 0; x < 4; ++x) {
10 SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width() / 4, source.height() / 4),
11 &srcPixels.front() + x * source.height() * source.width() / 4 +
12 y * source.width() / 4, source.rowBytes());
13 source.readPixels(pixmap, x * source.width() / 4, y * source.height() / 4);
14 }
15 }
16 canvas->scale(.5f, .5f);
17 SkBitmap bitmap;
18 bitmap.installPixels(SkImageInfo::MakeN32Premul(source.width(), source.height()),
19 &srcPixels.front(), source.rowBytes());
20 canvas->drawImage(bitmap.asImage(), 0, 0);
21 }
22 } // END FIDDLE
23