| // Copyright 2019 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| #include "tools/fiddle/examples.h" |
| // HASH=0424f67ebc2858e8fd04ae3367b115ff |
| REG_FIDDLE(Alpha_Constants_b, 256, 128, false, 1) { |
| void draw(SkCanvas* canvas) { |
| std::vector<int32_t> srcPixels; |
| srcPixels.resize(source.height() * source.rowBytes()); |
| SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width(), source.height()), |
| &srcPixels.front(), source.rowBytes()); |
| source.readPixels(pixmap, 0, 0); |
| for (int y = 0; y < source.height(); ++y) { |
| for (int x = 0; x < source.width(); ++x) { |
| SkPMColor pixel = srcPixels[y * source.width() + x]; |
| const SkColor color = SkUnPreMultiply::PMColorToColor(pixel); |
| if (SkColorGetA(color) == SK_AlphaOPAQUE) { |
| srcPixels[y * source.width() + x] = SK_ColorGREEN; |
| } |
| } |
| } |
| canvas->drawImage(SkImages::RasterFromPixmapCopy(pixmap), 0, 0); |
| } |
| } // END FIDDLE |