xref: /aosp_15_r20/external/skia/docs/examples/Pixmap_writable_addr.cpp (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)
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_writable_addr, 256, 256, true, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6     const int w = 4;
7     const int h = 4;
8     SkPMColor storage[w * h * 4];
9     SkPixmap pixmap(SkImageInfo::MakeN32(w, h, kPremul_SkAlphaType), storage, w * 4);
10     SkDebugf("pixmap.writable_addr() %c= (void *)storage\n",
11               pixmap.writable_addr()  == (void *)storage ? '=' : '!');
12     pixmap.erase(0x00000000);
13     *(SkPMColor*)pixmap.writable_addr() = 0xFFFFFFFF;
14     SkDebugf("pixmap.getColor(0, 1) %c= 0x00000000\n",
15               pixmap.getColor(0, 1)  == 0x00000000 ? '=' : '!');
16     SkDebugf("pixmap.getColor(0, 0) %c= 0xFFFFFFFF\n",
17               pixmap.getColor(0, 0)  == 0xFFFFFFFF ? '=' : '!');
18 }
19 }  // END FIDDLE
20