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