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factor out buffer alloc in AllocateARGBBuffers()

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+ small opportunistic fixes:
  * allow NULL decoded_data to be passed to DecodeStream
    and clarity (with assert()) when to do so
  * AllocateAndInitRescaler() was already setting error status,
    as it should. No need to do it at caller's site

Change-Id: I30867e596564a7f459a0d1ddbf6f5d312414b7fd
This commit is contained in:
Pascal Massimino 2012-05-23 01:53:57 -07:00
parent a107dfa806
commit 140b89a323
1 changed files with 34 additions and 26 deletions
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60
src/dec/vp8l.c
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@ -892,17 +892,46 @@ static int DecodeImageStream(int xsize, int ysize,
dec->status_ = VP8_STATUS_SUSPENDED;
}
} else {
*decoded_data = data;
if (decoded_data != NULL) {
*decoded_data = data;
} else {
// We allocate image data in this function only for transforms. At level 0
// (that is: not the transforms), we shouldn't have allocated anything.
assert(data == NULL);
assert(is_level0);
}
if (!is_level0) ClearMetadata(hdr); // Clean up temporary data behind.
}
return ok;
}
//------------------------------------------------------------------------------
// Allocate dec->argb_ and dec->argb_cache_ using dec->width_ and dec->height_
static int AllocateARGBBuffers(VP8LDecoder* const dec, int final_width) {
const int num_pixels = dec->width_ * dec->height_;
// Scratch buffer corresponding to top-prediction row for transforming the
// first row in the row-blocks.
const int cache_top_pixels = final_width;
// Scratch buffer for temporary BGRA storage.
const int cache_pixels = final_width * NUM_ARGB_CACHE_ROWS;
const int total_num_pixels = num_pixels + cache_top_pixels + cache_pixels;
assert(dec->width_ <= final_width);
dec->argb_ = (uint32_t*)malloc(total_num_pixels * sizeof(*dec->argb_));
if (dec->argb_ == NULL) {
dec->argb_cache_ = NULL;
dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
return 0;
}
dec->argb_cache_ = dec->argb_ + num_pixels + cache_top_pixels;
return 1;
}
//------------------------------------------------------------------------------
int VP8LDecodeHeader(VP8LDecoder* const dec, VP8Io* const io) {
int width, height;
uint32_t* decoded_data = NULL;
if (dec == NULL) return 0;
if (io == NULL) {
@ -922,10 +951,7 @@ int VP8LDecodeHeader(VP8LDecoder* const dec, VP8Io* const io) {
io->height = height;
dec->action_ = READ_HDR;
if (!DecodeImageStream(width, height, 1, dec, &decoded_data)) {
free(decoded_data);
goto Error;
}
if (!DecodeImageStream(width, height, 1, dec, NULL)) goto Error;
return 1;
Error:
@ -958,27 +984,9 @@ int VP8LDecodeImage(VP8LDecoder* const dec) {
goto Err;
}
{
const int num_pixels = dec->width_ * dec->height_;
// Scratch buffer corresponding to top-prediction row for transforming the
// first row in the row-blocks.
const int cache_top_pixels = io->width;
// Scratch buffer for temporary BGRA storage.
const int cache_pixels = io->width * NUM_ARGB_CACHE_ROWS;
const int total_num_pixels =
num_pixels + cache_top_pixels + cache_pixels;
dec->argb_ = (uint32_t*)malloc(total_num_pixels * sizeof(*dec->argb_));
if (dec->argb_ == NULL) {
dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
goto Err;
}
dec->argb_cache_ = dec->argb_ + num_pixels + cache_top_pixels;
}
if (!AllocateARGBBuffers(dec, io->width)) goto Err;
if (io->use_scaling && !AllocateAndInitRescaler(dec, io)) {
dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
goto Err;
}
if (io->use_scaling && !AllocateAndInitRescaler(dec, io)) goto Err;
// Decode.
dec->action_ = READ_DATA;