xref: /aosp_15_r20/external/skia/docs/examples/Bitmap_drawsNothing.cpp (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17)
1*c8dee2aaSAndroid Build Coastguard Worker // Copyright 2019 Google LLC.
2*c8dee2aaSAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3*c8dee2aaSAndroid Build Coastguard Worker #include "tools/fiddle/examples.h"
4*c8dee2aaSAndroid Build Coastguard Worker REG_FIDDLE(Bitmap_drawsNothing, 256, 256, true, 0) {
draw(SkCanvas * canvas)5*c8dee2aaSAndroid Build Coastguard Worker void draw(SkCanvas* canvas) {
6*c8dee2aaSAndroid Build Coastguard Worker     SkBitmap bitmap;
7*c8dee2aaSAndroid Build Coastguard Worker     for (int w : { 0, 8 } ) {
8*c8dee2aaSAndroid Build Coastguard Worker         for (bool allocate : { false, true} ) {
9*c8dee2aaSAndroid Build Coastguard Worker             bitmap.setInfo(SkImageInfo::MakeA8(w, 8));
10*c8dee2aaSAndroid Build Coastguard Worker             allocate ? bitmap.allocPixels() : (void) 0 ;
11*c8dee2aaSAndroid Build Coastguard Worker             SkDebugf("empty:%s isNull:%s drawsNothing:%s\n", bitmap.empty() ? "true " : "false",
12*c8dee2aaSAndroid Build Coastguard Worker                      bitmap.isNull() ? "true " : "false", bitmap.drawsNothing() ? "true" : "false");
13*c8dee2aaSAndroid Build Coastguard Worker         }
14*c8dee2aaSAndroid Build Coastguard Worker     }
15*c8dee2aaSAndroid Build Coastguard Worker }
16*c8dee2aaSAndroid Build Coastguard Worker }  // END FIDDLE
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