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- // 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();
- }
- }
- }
- }
- SkBitmap bitmap;
- bitmap.installPixels(pixmap);
- canvas->drawBitmap(bitmap, 0, 0);
- }
- } // END FIDDLE
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