xref: /aosp_15_r20/external/skia/docs/examples/Surface_notifyContentWillChange.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(Surface_notifyContentWillChange, 256, 256, true, 0) {
draw(SkCanvas * canvas)5*c8dee2aaSAndroid Build Coastguard Worker void draw(SkCanvas* canvas) {
6*c8dee2aaSAndroid Build Coastguard Worker     auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(1, 1));
7*c8dee2aaSAndroid Build Coastguard Worker     for (int i = 0; i < 3; ++i) {
8*c8dee2aaSAndroid Build Coastguard Worker         SkDebugf("surface generationID: %u\n", surface->generationID());
9*c8dee2aaSAndroid Build Coastguard Worker         if (0 == i) {
10*c8dee2aaSAndroid Build Coastguard Worker             surface->getCanvas()->drawColor(SK_ColorBLACK);
11*c8dee2aaSAndroid Build Coastguard Worker         } else {
12*c8dee2aaSAndroid Build Coastguard Worker             surface->notifyContentWillChange(SkSurface::kDiscard_ContentChangeMode);
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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