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Import: use relative pointer offsets

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avoids int rollover when working with large input

BUG=webp:312

Change-Id: I6ad9f93b6c4b665c559bff87716a7b847f66a20d
(cherry picked from commit 342e15f0ce)
This commit is contained in:
James Zern 2016-11-08 00:48:23 +00:00
parent a1ade40ed8
commit 83cbfa09a1
1 changed files with 17 additions and 12 deletions
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29
src/enc/picture_csp.c
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@ -1105,10 +1105,10 @@ static int Import(WebPPicture* const picture,
const uint8_t* const rgb, int rgb_stride,
int step, int swap_rb, int import_alpha) {
int y;
const uint8_t* const r_ptr = rgb + (swap_rb ? 2 : 0);
const uint8_t* const g_ptr = rgb + 1;
const uint8_t* const b_ptr = rgb + (swap_rb ? 0 : 2);
const uint8_t* const a_ptr = import_alpha ? rgb + 3 : NULL;
const uint8_t* r_ptr = rgb + (swap_rb ? 2 : 0);
const uint8_t* g_ptr = rgb + 1;
const uint8_t* b_ptr = rgb + (swap_rb ? 0 : 2);
const uint8_t* a_ptr = import_alpha ? rgb + 3 : NULL;
const int width = picture->width;
const int height = picture->height;
@ -1121,20 +1121,25 @@ static int Import(WebPPicture* const picture,
VP8EncDspARGBInit();
if (import_alpha) {
uint32_t* dst = picture->argb;
assert(step == 4);
for (y = 0; y < height; ++y) {
uint32_t* const dst = &picture->argb[y * picture->argb_stride];
const int offset = y * rgb_stride;
VP8PackARGB(a_ptr + offset, r_ptr + offset, g_ptr + offset,
b_ptr + offset, width, dst);
VP8PackARGB(a_ptr, r_ptr, g_ptr, b_ptr, width, dst);
a_ptr += rgb_stride;
r_ptr += rgb_stride;
g_ptr += rgb_stride;
b_ptr += rgb_stride;
dst += picture->argb_stride;
}
} else {
uint32_t* dst = picture->argb;
assert(step >= 3);
for (y = 0; y < height; ++y) {
uint32_t* const dst = &picture->argb[y * picture->argb_stride];
const int offset = y * rgb_stride;
VP8PackRGB(r_ptr + offset, g_ptr + offset, b_ptr + offset,
width, step, dst);
VP8PackRGB(r_ptr, g_ptr, b_ptr, width, step, dst);
r_ptr += rgb_stride;
g_ptr += rgb_stride;
b_ptr += rgb_stride;
dst += picture->argb_stride;
}
}
return 1;