29 lines
1.2 KiB
C++
29 lines
1.2 KiB
C++
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// 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=5949c9a63610cae30019e5b1899ee38f
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REG_FIDDLE(Image_scalePixels, 256, 128, false, 3) {
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void draw(SkCanvas* canvas) {
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std::vector<int32_t> srcPixels;
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int quarterWidth = image->width() / 16;
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int rowBytes = quarterWidth * 4;
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int quarterHeight = image->height() / 16;
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srcPixels.resize(quarterHeight * rowBytes);
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SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
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&srcPixels.front(), rowBytes);
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canvas->scale(4, 4);
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const SkSamplingOptions samplings[] = {
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SkSamplingOptions(),
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SkSamplingOptions(SkFilterMode::kLinear),
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SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear),
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SkSamplingOptions({1.0f/3, 1.0f/3}),
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};
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for (unsigned index = 0; index < SK_ARRAY_COUNT(samplings); ++index) {
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image->scalePixels(pixmap, samplings[index]);
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sk_sp<SkImage> filtered = SkImage::MakeFromRaster(pixmap, nullptr, nullptr);
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canvas->drawImage(filtered, 16 * index, 0);
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}
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}
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} // END FIDDLE
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