37 lines
1.7 KiB
C++
37 lines
1.7 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=bc9c7ea424d10bbcd1e5a88770d4794e
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REG_FIDDLE(Alpha_Constants_a, 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 < 16; ++y) {
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for (int x = 0; x < 16; ++x) {
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int32_t* blockStart = &srcPixels.front() + y * source.width() * 16 + x * 16;
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size_t transparentCount = 0;
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for (int fillY = 0; fillY < source.height() / 16; ++fillY) {
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for (int fillX = 0; fillX < source.width() / 16; ++fillX) {
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const SkColor color = SkUnPreMultiply::PMColorToColor(blockStart[fillX]);
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transparentCount += SkColorGetA(color) == SK_AlphaTRANSPARENT;
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}
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blockStart += source.width();
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}
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if (transparentCount > 200) {
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blockStart = &srcPixels.front() + y * source.width() * 16 + x * 16;
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for (int fillY = 0; fillY < source.height() / 16; ++fillY) {
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for (int fillX = 0; fillX < source.width() / 16; ++fillX) {
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blockStart[fillX] = SK_ColorRED;
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}
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blockStart += source.width();
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}
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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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