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restore decode API compatibility

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protect flip/alpha_dither w/a WEBP_DECODER_ABI_VERSION check

Change-Id: I437a5d5f78800f71b7e7e323faa321f946bf9515
This commit is contained in:
James Zern
2014-07-22 20:03:52 -07:00
parent d2cc61b7dd
commit 793368e8c6
9 changed files with 40 additions and 14 deletions
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2
src/dec/buffer.c
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@ -195,10 +195,12 @@ VP8StatusCode WebPAllocateDecBuffer(int w, int h,
status = AllocateBuffer(out);
if (status != VP8_STATUS_OK) return status;
#if WEBP_DECODER_ABI_VERSION > 0x0203
// Use the stride trick if vertical flip is needed.
if (options != NULL && options->flip) {
status = WebPFlipBuffer(out);
}
#endif
return status;
}

2
src/dec/frame.c
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@ -177,6 +177,7 @@ void VP8InitDithering(const WebPDecoderOptions* const options,
dec->dither_ = 1;
}
}
#if WEBP_DECODER_ABI_VERSION > 0x0203
// potentially allow alpha dithering
dec->alpha_dithering_ = options->alpha_dithering_strength;
if (dec->alpha_dithering_ > 100) {
@ -184,6 +185,7 @@ void VP8InitDithering(const WebPDecoderOptions* const options,
} else if (dec->alpha_dithering_ < 0) {
dec->alpha_dithering_ = 0;
}
#endif
}
}

6
src/dec/idec.c
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@ -240,15 +240,17 @@ static int CheckMemBufferMode(MemBuffer* const mem, MemBufferMode expected) {
// To be called last.
static VP8StatusCode FinishDecoding(WebPIDecoder* const idec) {
#if WEBP_DECODER_ABI_VERSION > 0x0203
const WebPDecoderOptions* const options = idec->params_.options;
WebPDecBuffer* const output = idec->params_.output;
idec->state_ = STATE_DONE;
if (options != NULL && options->flip) {
return WebPFlipBuffer(output);
} else {
return VP8_STATUS_OK;
}
#endif
idec->state_ = STATE_DONE;
return VP8_STATUS_OK;
}
//------------------------------------------------------------------------------

2
src/dec/webp.c
View File

@ -521,9 +521,11 @@ static VP8StatusCode DecodeInto(const uint8_t* const data, size_t data_size,
WebPFreeDecBuffer(params->output);
}
#if WEBP_DECODER_ABI_VERSION > 0x0203
if (params->options != NULL && params->options->flip) {
status = WebPFlipBuffer(params->output);
}
#endif
return status;
}