| // 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=bc9c7ea424d10bbcd1e5a88770d4794e |
| REG_FIDDLE(Alpha_Constants_a, 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 < 16; ++y) { |
| for (int x = 0; x < 16; ++x) { |
| int32_t* blockStart = &srcPixels.front() + y * source.width() * 16 + x * 16; |
| size_t transparentCount = 0; |
| for (int fillY = 0; fillY < source.height() / 16; ++fillY) { |
| for (int fillX = 0; fillX < source.width() / 16; ++fillX) { |
| const SkColor color = SkUnPreMultiply::PMColorToColor(blockStart[fillX]); |
| transparentCount += SkColorGetA(color) == SK_AlphaTRANSPARENT; |
| } |
| blockStart += source.width(); |
| } |
| if (transparentCount > 200) { |
| blockStart = &srcPixels.front() + y * source.width() * 16 + x * 16; |
| for (int fillY = 0; fillY < source.height() / 16; ++fillY) { |
| for (int fillX = 0; fillX < source.width() / 16; ++fillX) { |
| blockStart[fillX] = SK_ColorRED; |
| } |
| blockStart += source.width(); |
| } |
| } |
| } |
| } |
| canvas->drawImage(SkImages::RasterFromPixmapCopy(pixmap), 0, 0); |
| } |
| } // END FIDDLE |