| Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 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. |
| Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 3 | #include "tools/fiddle/examples.h" |
| Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 4 | // HASH=086866243bf9e4c14c3b215a2aa69ad9 |
| Hal Canary | a7181e7c | 2019-03-18 16:06:34 -0400 | [diff] [blame] | 5 | REG_FIDDLE(Pixmap_writable_addr32, 256, 72, false, 4) { |
| Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 6 | void 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(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->drawBitmap(bitmap, 0, 0); |
| 23 | } |
| 24 | } // END FIDDLE |