xref: /aosp_15_r20/external/skia/docs/examples/Surface_MakeNull.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(Surface_MakeNull, 256, 256, true, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6     SkDebugf("SkSurfaces::Null(0, 0) %c= nullptr\n", SkSurfaces::Null(0, 0) == nullptr ?
7              '=' : '!');
8     const int w = 37;
9     const int h = 1000;
10     auto surf = SkSurfaces::Null(w, h);
11     auto nullCanvas = surf->getCanvas();
12     nullCanvas->drawPaint(SkPaint());   // does not crash, nothing draws
13     SkDebugf("surf->makeImageSnapshot() %c= nullptr\n", surf->makeImageSnapshot() == nullptr ?
14             '=' : '!');
15 }
16 }  // END FIDDLE
17