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mp_image: align stride to multiple of texel size

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This helps with compatibility and/or performance in particular for
oddly-sized formats like rgb24. We use a loop to avoid having to
calculate the lcm (or waste bytes in the extremely common case of the
byte size and the stride align having shared factors).
This commit is contained in:
Niklas Haas 2018-11-18 05:47:43 +01:00 committed by Jan Ekström
parent a3c808c6c8
commit 9f7dcc0726
1 changed files with 3 additions and 0 deletions
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video/mp_image.c
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@ -72,6 +72,9 @@ static int mp_image_layout(int imgfmt, int w, int h, int stride_align,
int alloc_h = MP_ALIGN_UP(h, 32) >> desc.ys[n];
int line_bytes = (alloc_w * desc.bpp[n] + 7) / 8;
out_stride[n] = MP_ALIGN_UP(line_bytes, stride_align);
// also align to a multiple of desc.bytes[n]
while (desc.bytes[n] && out_stride[n] % desc.bytes[n])
out_stride[n] += stride_align;
out_plane_size[n] = out_stride[n] * alloc_h;
}
if (desc.flags & MP_IMGFLAG_PAL)