1cb93a386Sopenharmony_ci// Copyright 2019 Google LLC. 2cb93a386Sopenharmony_ci// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3cb93a386Sopenharmony_ci#include "tools/fiddle/examples.h" 4cb93a386Sopenharmony_ci// HASH=0424f67ebc2858e8fd04ae3367b115ff 5cb93a386Sopenharmony_ciREG_FIDDLE(Alpha_Constants_b, 256, 128, false, 1) { 6cb93a386Sopenharmony_civoid draw(SkCanvas* canvas) { 7cb93a386Sopenharmony_ci std::vector<int32_t> srcPixels; 8cb93a386Sopenharmony_ci srcPixels.resize(source.height() * source.rowBytes()); 9cb93a386Sopenharmony_ci SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width(), source.height()), 10cb93a386Sopenharmony_ci &srcPixels.front(), source.rowBytes()); 11cb93a386Sopenharmony_ci source.readPixels(pixmap, 0, 0); 12cb93a386Sopenharmony_ci for (int y = 0; y < source.height(); ++y) { 13cb93a386Sopenharmony_ci for (int x = 0; x < source.width(); ++x) { 14cb93a386Sopenharmony_ci SkPMColor pixel = srcPixels[y * source.width() + x]; 15cb93a386Sopenharmony_ci const SkColor color = SkUnPreMultiply::PMColorToColor(pixel); 16cb93a386Sopenharmony_ci if (SkColorGetA(color) == SK_AlphaOPAQUE) { 17cb93a386Sopenharmony_ci srcPixels[y * source.width() + x] = SK_ColorGREEN; 18cb93a386Sopenharmony_ci } 19cb93a386Sopenharmony_ci } 20cb93a386Sopenharmony_ci } 21cb93a386Sopenharmony_ci canvas->drawImage(SkImage::MakeRasterCopy(pixmap), 0, 0); 22cb93a386Sopenharmony_ci} 23cb93a386Sopenharmony_ci} // END FIDDLE 24