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make alpha unfilter work in-place

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* remove a malloc
* remove the unused 'bpp' argument from filter/unfilter functions

Change-Id: I28d78baaaddc20f1d5a3bb2bd0b4e96a12a920d8
This commit is contained in:
skal
2013-03-14 20:26:39 +01:00
parent 14ef5005a2
commit 0aef3ebdea
4 changed files with 44 additions and 55 deletions
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19
src/dec/alpha.c
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@ -44,7 +44,6 @@ static int DecodeAlpha(const uint8_t* data, size_t data_size,
int width, int height, int stride, uint8_t* output) {
uint8_t* decoded_data = NULL;
const size_t decoded_size = height * width;
uint8_t* unfiltered_data = NULL;
WEBP_FILTER_TYPE filter;
int pre_processing;
int rsrv;
@ -83,29 +82,19 @@ static int DecodeAlpha(const uint8_t* data, size_t data_size,
}
if (ok) {
WebPFilterFunc unfilter_func = WebPUnfilters[filter];
WebPUnfilterFunc unfilter_func = WebPUnfilters[filter];
if (unfilter_func != NULL) {
unfiltered_data = (uint8_t*)malloc(decoded_size);
if (unfiltered_data == NULL) {
ok = 0;
goto Error;
}
// TODO(vikas): Implement on-the-fly decoding & filter mechanism to decode
// and apply filter per image-row.
unfilter_func(decoded_data, width, height, 1, width, unfiltered_data);
// Construct raw_data (height x stride) from alpha data (height x width).
CopyPlane(unfiltered_data, width, output, stride, width, height);
free(unfiltered_data);
} else {
// Construct raw_data (height x stride) from alpha data (height x width).
CopyPlane(decoded_data, width, output, stride, width, height);
unfilter_func(width, height, width, decoded_data);
}
// Construct raw_data (height x stride) from alpha data (height x width).
CopyPlane(decoded_data, width, output, stride, width, height);
if (pre_processing == ALPHA_PREPROCESSED_LEVELS) {
ok = DequantizeLevels(decoded_data, width, height);
}
}
Error:
if (method != ALPHA_NO_COMPRESSION) {
free(decoded_data);
}