1 /*
2 * Copyright 2024 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "src/codec/SkPngCompositeChunkReader.h"
9 #include <cstring>
10
11 class SkData;
12
readChunk(const char tag[],const void * data,size_t length)13 bool SkPngCompositeChunkReader::readChunk(const char tag[], const void* data, size_t length) {
14 if (fChunkReader && !fChunkReader->readChunk(tag, data, length)) {
15 // Only fail if the client's chunk reader failed; If we don't have a
16 // chunk reader we would still need to grab gainmap chunks
17 return false;
18 }
19
20 // If we found a chunk but there's no data, then just skip it!
21 if (data == nullptr || length == 0) {
22 return true;
23 }
24
25 if (strcmp("gmAP", tag) == 0) {
26 SkMemoryStream stream(data, length);
27 sk_sp<SkData> streamData = stream.getData();
28 SkGainmapInfo info;
29 if (SkGainmapInfo::Parse(streamData.get(), info)) {
30 fGainmapInfo.emplace(std::move(info));
31 }
32 } else if (strcmp("gdAT", tag) == 0) {
33 fGainmapStream = SkMemoryStream::MakeCopy(data, length);
34 }
35
36 return true;
37 }
38