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only allocate alpha_plane_ up to crop_bottom row

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-> reduces memory consumption in case of cropping

work for bug #288

Change-Id: Icab6eb8e67e3c5c184a9363fffcd9f6acd0b311c
This commit is contained in:
Pascal Massimino 2016-04-06 13:43:01 +02:00
parent 774dfbdc34
commit aa809cfeb3
1 changed files with 6 additions and 4 deletions
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10
src/dec/alpha.c
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@ -113,7 +113,7 @@ static int ALPHInit(ALPHDecoder* const dec, const uint8_t* data,
static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
ALPHDecoder* const alph_dec = dec->alph_dec_;
const int width = alph_dec->width_;
const int height = alph_dec->height_;
const int height = alph_dec->io_.crop_bottom;
uint8_t* const output = dec->alpha_plane_;
if (alph_dec->method_ == ALPHA_NO_COMPRESSION) {
const size_t offset = row * width;
@ -131,7 +131,7 @@ static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
}
}
if (row + num_rows >= alph_dec->io_.crop_bottom) {
if (row + num_rows >= height) {
dec->is_alpha_decoded_ = 1;
}
return 1;
@ -139,12 +139,14 @@ static int ALPHDecode(VP8Decoder* const dec, int row, int num_rows) {
static int AllocateAlphaPlane(VP8Decoder* const dec, const VP8Io* const io) {
const int stride = io->width;
const int height = io->height;
const int height = io->crop_bottom;
const uint64_t alpha_size = (uint64_t)stride * height;
assert(dec->alpha_plane_mem_ == NULL);
dec->alpha_plane_mem_ =
(uint8_t*)WebPSafeMalloc(alpha_size, sizeof(*dec->alpha_plane_));
if (dec->alpha_plane_mem_ == NULL) return 0;
if (dec->alpha_plane_mem_ == NULL) {
return 0;
}
dec->alpha_plane_ = dec->alpha_plane_mem_;
return 1;
}