| 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=0424f67ebc2858e8fd04ae3367b115ff |
| Hal Canary | a7181e7c | 2019-03-18 16:06:34 -0400 | [diff] [blame] | 5 | REG_FIDDLE(Alpha_Constants_b, 256, 128, false, 1) { |
| Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 6 | void draw(SkCanvas* canvas) { |
| 7 | std::vector<int32_t> srcPixels; |
| 8 | srcPixels.resize(source.height() * source.rowBytes()); |
| 9 | SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width(), source.height()), |
| 10 | &srcPixels.front(), source.rowBytes()); |
| 11 | source.readPixels(pixmap, 0, 0); |
| 12 | for (int y = 0; y < source.height(); ++y) { |
| 13 | for (int x = 0; x < source.width(); ++x) { |
| 14 | SkPMColor pixel = srcPixels[y * source.width() + x]; |
| 15 | const SkColor color = SkUnPreMultiply::PMColorToColor(pixel); |
| 16 | if (SkColorGetA(color) == SK_AlphaOPAQUE) { |
| 17 | srcPixels[y * source.width() + x] = SK_ColorGREEN; |
| 18 | } |
| 19 | } |
| 20 | } |
| Mike Reed | 34a0c97 | 2021-01-25 17:49:32 -0500 | [diff] [blame] | 21 | canvas->drawImage(SkImage::MakeRasterCopy(pixmap), 0, 0); |
| Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 22 | } |
| 23 | } // END FIDDLE |