36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
// Copyright 2020 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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REG_FIDDLE(UnpremulGPU, 256, 256, false, 6) {
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void draw(SkCanvas* canvas) {
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canvas->clear(0xffa020a0);
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SkImageInfo premulInfo = SkImageInfo::MakeS32(10, 10, kPremul_SkAlphaType);
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SkBitmap premulBitmap;
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premulBitmap.allocPixels(premulInfo);
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for (int y = 0; y < 10; y++) {
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for (int x = 0; x < 10; x++) {
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*(premulBitmap.getAddr32(x, y)) = 0x80808080;
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}
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}
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sk_sp<SkImage> premulImage = premulBitmap.asImage();
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SkImageInfo unpremulInfo = premulInfo.makeAlphaType(kUnpremul_SkAlphaType);
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SkBitmap unpremulBitmap;
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unpremulBitmap.allocPixels(unpremulInfo);
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for (int y = 0; y < 10; y++) {
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for (int x = 0; x < 10; x++) {
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*(unpremulBitmap.getAddr32(x, y)) = 0x80FFFFFF;
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}
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}
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sk_sp<SkImage> unpremulImage = unpremulBitmap.asImage();
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SkPaint paint;
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const SkTileMode tile = SkTileMode::kRepeat;
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paint.setShader(premulImage->makeShader(tile, tile, SkSamplingOptions()));
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canvas->drawCircle(10.0f, 10.0f, 10.0f, paint);
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paint.setShader(unpremulImage->makeShader(tile, tile, SkSamplingOptions()));
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canvas->drawCircle(10.0f, 35.0f, 10.0f, paint);
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}
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} // END FIDDLE
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