1// Copyright 2019 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"
4// HASH=5949c9a63610cae30019e5b1899ee38f
5REG_FIDDLE(Image_scalePixels, 256, 128, false, 3) {
6void draw(SkCanvas* canvas) {
7    std::vector<int32_t> srcPixels;
8    int quarterWidth = image->width() / 16;
9    int rowBytes = quarterWidth * 4;
10    int quarterHeight = image->height() / 16;
11    srcPixels.resize(quarterHeight * rowBytes);
12    SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
13                    &srcPixels.front(), rowBytes);
14    canvas->scale(4, 4);
15
16    const SkSamplingOptions samplings[] = {
17        SkSamplingOptions(),
18        SkSamplingOptions(SkFilterMode::kLinear),
19        SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear),
20        SkSamplingOptions({1.0f/3, 1.0f/3}),
21    };
22    for (unsigned index = 0; index < SK_ARRAY_COUNT(samplings); ++index) {
23        image->scalePixels(pixmap, samplings[index]);
24        sk_sp<SkImage> filtered = SkImage::MakeFromRaster(pixmap, nullptr, nullptr);
25        canvas->drawImage(filtered, 16 * index, 0);
26    }
27}
28}  // END FIDDLE
29