xref: /aosp_15_r20/external/skia/docs/examples/Bitmap_drawsNothing.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(Bitmap_drawsNothing, 256, 256, true, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6     SkBitmap bitmap;
7     for (int w : { 0, 8 } ) {
8         for (bool allocate : { false, true} ) {
9             bitmap.setInfo(SkImageInfo::MakeA8(w, 8));
10             allocate ? bitmap.allocPixels() : (void) 0 ;
11             SkDebugf("empty:%s isNull:%s drawsNothing:%s\n", bitmap.empty() ? "true " : "false",
12                      bitmap.isNull() ? "true " : "false", bitmap.drawsNothing() ? "true" : "false");
13         }
14     }
15 }
16 }  // END FIDDLE
17