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