1// Copyright 2020 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "tools/fiddle/examples.h"
4REG_FIDDLE(UnpremulGPU, 256, 256, false, 6) {
5void draw(SkCanvas* canvas) {
6    canvas->clear(0xffa020a0);
7    SkImageInfo premulInfo = SkImageInfo::MakeS32(10, 10, kPremul_SkAlphaType);
8    SkBitmap premulBitmap;
9    premulBitmap.allocPixels(premulInfo);
10    for (int y = 0; y < 10; y++) {
11        for (int x = 0; x < 10; x++) {
12            *(premulBitmap.getAddr32(x, y)) = 0x80808080;
13        }
14    }
15    sk_sp<SkImage> premulImage = premulBitmap.asImage();
16
17    SkImageInfo unpremulInfo = premulInfo.makeAlphaType(kUnpremul_SkAlphaType);
18    SkBitmap unpremulBitmap;
19    unpremulBitmap.allocPixels(unpremulInfo);
20    for (int y = 0; y < 10; y++) {
21        for (int x = 0; x < 10; x++) {
22            *(unpremulBitmap.getAddr32(x, y)) = 0x80FFFFFF;
23        }
24    }
25    sk_sp<SkImage> unpremulImage = unpremulBitmap.asImage();
26
27    SkPaint paint;
28    const SkTileMode tile = SkTileMode::kRepeat;
29    paint.setShader(premulImage->makeShader(tile, tile, SkSamplingOptions()));
30    canvas->drawCircle(10.0f, 10.0f, 10.0f, paint);
31
32    paint.setShader(unpremulImage->makeShader(tile, tile, SkSamplingOptions()));
33    canvas->drawCircle(10.0f, 35.0f, 10.0f, paint);
34}
35}  // END FIDDLE
36