34a0c97f5e
Bug: skia:11216 Change-Id: I89a40e330f27f30c461f2b6012bf26c082b66094 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/359076 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
24 lines
1.0 KiB
C++
24 lines
1.0 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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// HASH=0424f67ebc2858e8fd04ae3367b115ff
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REG_FIDDLE(Alpha_Constants_b, 256, 128, false, 1) {
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void draw(SkCanvas* canvas) {
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std::vector<int32_t> srcPixels;
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srcPixels.resize(source.height() * source.rowBytes());
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SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width(), source.height()),
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&srcPixels.front(), source.rowBytes());
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source.readPixels(pixmap, 0, 0);
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for (int y = 0; y < source.height(); ++y) {
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for (int x = 0; x < source.width(); ++x) {
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SkPMColor pixel = srcPixels[y * source.width() + x];
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const SkColor color = SkUnPreMultiply::PMColorToColor(pixel);
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if (SkColorGetA(color) == SK_AlphaOPAQUE) {
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srcPixels[y * source.width() + x] = SK_ColorGREEN;
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}
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}
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}
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canvas->drawImage(SkImage::MakeRasterCopy(pixmap), 0, 0);
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}
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} // END FIDDLE
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