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SDWebImageWebPCoder
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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
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52
SDWebImageWebPCoder/Classes/SDImageWebPCoder.m
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@ -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);
_hasAnimation = YES;
}
} else {
// 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];
}
}