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swscale/rgb2xyz: add explicit width parameter

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This fixes an 11-year-old bug in the rgb2xyz functions, when used with a
negative stride. The current loop bounds turned it into a no-op.

Additionally, this increases performance on highly cropped images, whose
stride may be substantially higher than the effective width.

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
This commit is contained in:
Niklas Haas 2024-10-07 18:58:29 +02:00
parent ea228fc415
commit 9d8f5141cf
2 changed files with 9 additions and 8 deletions
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13
libswscale/swscale.c
View File

@ -638,12 +638,12 @@ static int check_image_pointers(const uint8_t * const data[4], enum AVPixelForma
}
static void xyz12Torgb48(struct SwsContext *c, uint16_t *dst,
const uint16_t *src, int stride, int h)
const uint16_t *src, int stride, int w, int h)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
for (int yp = 0; yp < h; yp++) {
for (int xp = 0; xp + 2 < stride; xp += 3) {
for (int xp = 0; xp < 3 * w; xp += 3) {
int x, y, z, r, g, b;
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
@ -693,12 +693,12 @@ static void xyz12Torgb48(struct SwsContext *c, uint16_t *dst,
}
static void rgb48Toxyz12(struct SwsContext *c, uint16_t *dst,
const uint16_t *src, int stride, int h)
const uint16_t *src, int stride, int w, int h)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->dstFormat);
for (int yp = 0; yp < h; yp++) {
for (int xp = 0; xp + 2 < stride; xp += 3) {
for (int xp = 0; xp < 3 * w; xp += 3) {
int x, y, z, r, g, b;
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
@ -993,7 +993,8 @@ static int scale_internal(SwsContext *c,
base = srcStride[0] < 0 ? c->xyz_scratch - srcStride[0] * (srcSliceH-1) :
c->xyz_scratch;
xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2, srcSliceH);
xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2,
c->srcW, srcSliceH);
src2[0] = base;
}
@ -1065,7 +1066,7 @@ static int scale_internal(SwsContext *c,
}
/* replace on the same data */
rgb48Toxyz12(c, dst16, dst16, dstStride2[0]/2, ret);
rgb48Toxyz12(c, dst16, dst16, dstStride2[0]/2, c->dstW, ret);
}
/* reset slice direction at end of frame */

4
tests/ref/fate/filter-pixfmts-vflip
View File

@ -103,8 +103,8 @@ x2bgr10le 795b66a5fc83cd2cf300aae51c230f80
x2rgb10le 262c502230cf3724f8e2cf4737f18a42
xv30le 7e29ee107a1fabf3c7251f337d4b9fe5
xv36le bf1cbef0745f90881e15f5c5db3c5949
xyz12be 810644e008deb231850d779aaa27cc7e
xyz12le 829701db461b43533cf9241e0743bc61
xyz12be 23fa9fb36d49dce61e284d41b83e0e6b
xyz12le ef73e6d1f932a9a355df1eedd628394f
y210le 9544c81f8e1fc95e9fa4009dbecfea25
y212le c801725ae31e3b8f5be269359d49f191
ya16be 55b1dbbe4d56ed0d22461685ce85520d