25 lines
1.0 KiB
C++
25 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=086866243bf9e4c14c3b215a2aa69ad9
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REG_FIDDLE(Pixmap_writable_addr32, 256, 72, false, 4) {
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void draw(SkCanvas* canvas) {
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std::vector<int32_t> pixels;
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pixels.resize(image->height() * image->width() * 4);
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SkPixmap pixmap(SkImageInfo::Make(image->width(), image->height(), kN32_SkColorType,
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image->alphaType()), (const void*) &pixels.front(), image->width() * 4);
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image->readPixels(nullptr, pixmap, 0, 0);
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for (int y = 0; y < pixmap.height() / 2; ++y) {
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for (int x = 0; x < pixmap.width(); ++x) {
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if ((x & 4) == (y & 4)) {
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*pixmap.writable_addr32(x, y) =
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*pixmap.writable_addr32(pixmap.width() - x - 1, pixmap.height() - y - 1);
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}
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}
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}
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SkBitmap bitmap;
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bitmap.installPixels(pixmap);
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canvas->drawImage(bitmap.asImage(), 0, 0);
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}
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} // END FIDDLE
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