mirrors
/
SDWebImageWebPCoder
mirror of https://github.com/rela-tech/SDWebImageWebPCoder.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Use lock and copy the NSData before recreate the temp demuxer, avoid the extra copy for most cases, and use lock during the demuxer creation to avoid thread-safe issue

This commit is contained in:
DreamPiggy 2020-04-13 01:20:18 +08:00
parent 92e55d4fd6
commit 878d64e3e1
1 changed files with 23 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
SDWebImageWebPCoder/Classes/SDImageWebPCoder.m
View File

@ -86,7 +86,6 @@ static CGSize SDCalculateThumbnailSize(CGSize fullSize, BOOL preserveAspectRatio
@implementation SDImageWebPCoder {
WebPIDecoder *_idec;
WebPDemuxer *_demux;
WebPData *_webpdata; // Copied for progressive animation demuxer
NSData *_imageData;
CGFloat _scale;
NSUInteger _loopCount;
@ -114,10 +113,6 @@ static CGSize SDCalculateThumbnailSize(CGSize fullSize, BOOL preserveAspectRatio
WebPDemuxDelete(_demux);
_demux = NULL;
}
if (_webpdata) {
WebPDataClear(_webpdata);
_webpdata = NULL;
}
if (_canvas) {
CGContextRelease(_canvas);
_canvas = NULL;
@ -305,41 +300,36 @@ static CGSize SDCalculateThumbnailSize(CGSize fullSize, BOOL preserveAspectRatio
if (_finished) {
return;
}
_imageData = data;
_finished = finished;
if (!_demux) {
VP8StatusCode status = WebPIUpdate(_idec, data.bytes, data.length);
if (status == VP8_STATUS_OK || status == VP8_STATUS_SUSPENDED) {
// check whether we can detect Animated WebP or Static WebP, they need different codec (Demuxer or IDecoder)
if (!_hasAnimation) {
_imageData = [data copy];
VP8StatusCode status = WebPIUpdate(_idec, _imageData.bytes, _imageData.length);
// For Static WebP, all things done.
// For Animated WebP (currently use `VP8_STATUS_UNSUPPORTED_FEATURE` to check), continue to create demuxer
if (status != VP8_STATUS_UNSUPPORTED_FEATURE) {
return;
}
// This case may be Animated WebP progressive decode
if (status == VP8_STATUS_UNSUPPORTED_FEATURE) {
WebPDemuxState state;
WebPData tmpData;
WebPDataInit(&tmpData);
tmpData.bytes = data.bytes;
tmpData.size = data.length;
// Copy to avoid the NSData dealloc and VP8 internal retain the pointer
_webpdata = malloc(sizeof(WebPData));
WebPDataCopy(&tmpData, _webpdata);
_demux = WebPDemuxPartial(_webpdata, &state);
}
} else {
// libwebp current have no API to update demuxer, so we always delete and recreate demuxer
_hasAnimation = YES;
}
// libwebp current have no API to update demuxer, so we always delete and recreate demuxer
// Use lock to avoid progressive animation decoding thread safe issue
SD_LOCK(_lock);
if (_demux) {
// next line `_imageData = nil` ARC will release the raw buffer, but need release the demuxer firstly because libwebp don't use retain/release rule
WebPDemuxDelete(_demux);
_demux = NULL;
WebPDemuxState state;
WebPData tmpData;
WebPDataInit(&tmpData);
tmpData.bytes = data.bytes;
tmpData.size = data.length;
// Copy to avoid the NSData dealloc and VP8 internal retain the pointer
WebPDataClear(_webpdata);
WebPDataCopy(&tmpData, _webpdata);
_demux = WebPDemuxPartial(_webpdata, &state);
}
_imageData = [data copy];
WebPData webpData;
WebPDataInit(&webpData);
webpData.bytes = _imageData.bytes;
webpData.size = _imageData.length;
WebPDemuxState state;
_demux = WebPDemuxPartial(&webpData, &state);
SD_UNLOCK(_lock);
if (_demux) {
if (_demux && state != WEBP_DEMUX_PARSE_ERROR) {
[self scanAndCheckFramesValidWithDemuxer:_demux];
}
}