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=9b3133a6673d2514d166398adbe1f9f4
5 REG_FIDDLE(Bitmap_writePixels, 256, 256, false, 3) {
draw(SkCanvas * canvas)6 void draw(SkCanvas* canvas) {
7 std::vector<int32_t> srcPixels;
8 int width = image->width();
9 int height = image->height();
10 srcPixels.resize(height * width * 4);
11 SkPixmap pixmap(SkImageInfo::MakeN32Premul(width, height), (const void*) &srcPixels.front(),
12 width * 4);
13 image->readPixels(nullptr, pixmap, 0, 0);
14 canvas->scale(.5f, .5f);
15 width /= 4;
16 height /= 4;
17 for (int y = 0; y < 4; ++y) {
18 for (int x = 0; x < 4; ++x) {
19 SkBitmap bitmap;
20 bitmap.allocPixels(SkImageInfo::MakeN32Premul(width, height));
21 bitmap.writePixels(pixmap, -y * width, -x * height);
22 canvas->drawImage(bitmap.asImage(), x * width, y * height);
23 }
24 }
25 }
26 } // END FIDDLE
27