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mp_image: add some helpers 

This is really basic for planar image data access; not sure why there
weren't such helpers before.

They also handle trickier formats that use bit-packing, or they would be
mich simpler. (This affects only BGR4/BGR4/MONOW/MONOH, I hope whoever
invented them is proud of triggering so many special cases for so little
gain.)
This commit is contained in:
wm4 2020-05-02 23:48:43 +02:00
parent 349eb0b7fc
commit b2720dba0f
2 changed files with 23 additions and 0 deletions
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20
video/mp_image.c
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@ -1041,3 +1041,23 @@ void memset16_pic(void *dst, int fill, int unitsPerLine, int height, int stride)
}
}
}
// Pixel at the given luma position on the given plane, possibly rounded down.
void *mp_image_pixel_ptr(struct mp_image *img, int plane, int x, int y)
{
return img->planes[plane] +
img->stride[plane] * (ptrdiff_t)(y >> img->fmt.ys[plane]) +
(size_t)(x >> img->fmt.xs[plane]) * img->fmt.bpp[plane] / 8;
}
// Number of bytes for w pixels, using luma pixels, possibly rounded up.
// x0 is the start pixel; matters if the start pixel is rounded down.
// (E.g. 8 bpp, x0=7, w=7 => pixels 0..15 => 2 bytes)
size_t mp_image_plane_bytes(struct mp_image *img, int plane, int x0, int w)
{
int bpp = img->fmt.bpp[plane];
int xs = img->fmt.xs[plane];
size_t b_x0 = (x0 >> xs) * bpp / 8;
size_t b_x1 = (((x0 + w + (1 << xs) - 1) >> xs) * bpp + 7) / 8;
return b_x1 - b_x0;
}

3
video/mp_image.h
View File

@ -185,4 +185,7 @@ void memcpy_pic(void *dst, const void *src, int bytesPerLine, int height,
void memset_pic(void *dst, int fill, int bytesPerLine, int height, int stride);
void memset16_pic(void *dst, int fill, int unitsPerLine, int height, int stride);
void *mp_image_pixel_ptr(struct mp_image *img, int plane, int x, int y);
size_t mp_image_plane_bytes(struct mp_image *img, int plane, int x0, int w);
#endif /* MPLAYER_MP_IMAGE_H */