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 REG_FIDDLE(Pixmap_getColor, 256, 256, true, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 const int w = 4;
7 const int h = 4;
8 std::vector<SkPMColor> storage;
9 storage.resize(w * h);
10 SkDebugf("Premultiplied:\n");
11 for (int y = 0; y < h; ++y) {
12 SkDebugf("(0, %d) ", y);
13 for (int x = 0; x < w; ++x) {
14 const int a = 0xFF * (x + y) / (w - 1 + h - 1),
15 r = 0xFF * x / (w - 1),
16 g = 0xFF * y / (h - 1),
17 b = 0xFF;
18 storage[x + y * w] = SkPreMultiplyColor(SkColorSetARGB(a, r, g, b));
19 SkDebugf("0x%08x%c", storage[x + y * w], x == w - 1 ? '\n' : ' ');
20 }
21 }
22 SkPixmap pixmap(SkImageInfo::MakeN32(w, h, kPremul_SkAlphaType), &storage.front(), w * 4);
23 SkDebugf("Unpremultiplied:\n");
24 for (int y = 0; y < h; ++y) {
25 SkDebugf("(0, %d) ", y);
26 for (int x = 0; x < w; ++x) {
27 SkDebugf("0x%08x%c", pixmap.getColor(x, y), x == w - 1 ? '\n' : ' ');
28 }
29 }
30 }
31 } // END FIDDLE
32