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avcodec/apngdec: Fix typos in decoder causing incorrect results

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Signed-off-by: Donny Yang <work@kota.moe>
This commit is contained in:
Donny Yang
2015-07-19 20:20:56 +00:00
committed by Paul B Mahol
parent fdac5ff682
commit 0030613d69
1 changed files with 6 additions and 5 deletions
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11
libavcodec/pngdec.c
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@@ -851,13 +851,13 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
return AVERROR_INVALIDDATA;
if (sequence_number == 0 && s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
if (sequence_number == 0 && dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
// No previous frame to revert to for the first frame
// Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
s->dispose_op = APNG_DISPOSE_OP_BACKGROUND;
dispose_op = APNG_DISPOSE_OP_BACKGROUND;
}
if (s->dispose_op == APNG_BLEND_OP_OVER && !s->has_trns && (
if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
@@ -865,8 +865,8 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
)) {
// APNG_DISPOSE_OP_OVER is the same as APNG_DISPOSE_OP_SOURCE when there is no alpha channel
s->dispose_op = APNG_BLEND_OP_SOURCE;
// APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
blend_op = APNG_BLEND_OP_SOURCE;
}
s->cur_w = cur_w;
@@ -1283,6 +1283,7 @@ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
pdst->cur_h = psrc->cur_h;
pdst->x_offset = psrc->x_offset;
pdst->y_offset = psrc->y_offset;
pdst->has_trns = psrc->has_trns;
pdst->dispose_op = psrc->dispose_op;