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fix alignment of allocated memory in AllocateTransformBuffer

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likely to avoid unaligned reads in the future

Change-Id: I434ba17c139ad6e190ebd9b909b241c6c6f1e7f8
This commit is contained in:
Pascal Massimino 2015-10-14 00:04:13 -07:00
parent 12ec204ec7
commit fea94b2b36
1 changed files with 22 additions and 20 deletions
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42
src/enc/vp8l.c
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@ -1122,28 +1122,30 @@ static WebPEncodingError AllocateTransformBuffer(VP8LEncoder* const enc,
int width, int height) {
WebPEncodingError err = VP8_ENC_OK;
if (enc->argb_ == NULL) {
const int tile_size = 1 << enc->transform_bits_;
const uint64_t image_size = width * height;
const int tile_size = 1 << enc->transform_bits_;
const uint64_t image_size = width * height;
const uint64_t argb_scratch_size =
enc->use_predict_ ? tile_size * width + width : 0;
const int transform_data_size =
(enc->use_predict_ || enc->use_cross_color_) ?
VP8LSubSampleSize(width, enc->transform_bits_) *
VP8LSubSampleSize(height, enc->transform_bits_) : 0;
const uint64_t total_size =
image_size + argb_scratch_size + (uint64_t)transform_data_size;
uint32_t* mem = (uint32_t*)WebPSafeMalloc(total_size, sizeof(*mem));
if (mem == NULL) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
}
// TODO(skal): align
enc->argb_ = mem;
mem += image_size;
enc->argb_scratch_ = mem;
mem += argb_scratch_size;
enc->transform_data_ = mem;
enc->current_width_ = width;
const int transform_data_size =
(enc->use_predict_ || enc->use_cross_color_)
? VP8LSubSampleSize(width, enc->transform_bits_) *
VP8LSubSampleSize(height, enc->transform_bits_)
: 0;
const uint64_t total_size =
image_size + WEBP_ALIGN_CST +
argb_scratch_size + WEBP_ALIGN_CST +
(uint64_t)transform_data_size;
uint32_t* mem = (uint32_t*)WebPSafeMalloc(total_size, sizeof(*mem));
if (mem == NULL) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
}
enc->argb_ = mem;
mem = (uint32_t*)WEBP_ALIGN(mem + image_size);
enc->argb_scratch_ = mem;
mem = (uint32_t*)WEBP_ALIGN(mem + argb_scratch_size);
enc->transform_data_ = mem;
enc->current_width_ = width;
}
Error:
return err;