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(subset_example, 512, 512, false, 3) {
5void draw(SkCanvas* canvas) {
6    canvas->drawColor(SK_ColorWHITE);
7    const int N = 8;
8    int shuffle[N * N];
9    for (int i = 0; i < (N * N); ++i) {
10        shuffle[i] = i;
11    }
12    srand(0);
13    for (int i = 0; i < (N * N); ++i) {
14        std::swap(shuffle[i], shuffle[rand() % (N * N - i) + i]);
15    }
16    int w = (source.width() - 1) / N + 1;
17    int h = (source.height() - 1) / N + 1;
18    for (int i = 0; i < N; ++i) {
19        for (int j = 0; j < N; ++j) {
20            int x = shuffle[(N * i) + j] % N;
21            int y = shuffle[(N * i) + j] / N;
22            SkBitmap subset;
23            source.extractSubset(&subset, SkIRect::MakeXYWH(w * x, h * y, w, h));
24            canvas->drawImage(subset.asImage(), w * i, h * j);
25        }
26    }
27}
28}  // END FIDDLE
29