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videoscale: Fix linear scaling for one byte components

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Fixes bug #577054.
This commit is contained in:
Sebastian Dröge 2009-03-29 12:01:33 +02:00
parent 954b1713e1
commit ab7d52c053
1 changed files with 15 additions and 13 deletions
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28
gst/videoscale/vs_scanline.c
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@ -61,27 +61,29 @@ vs_scanline_resample_nearest_Y (uint8_t * dest, uint8_t * src, int src_width,
*accumulator = acc;
}
#include <glib.h>
void
vs_scanline_resample_linear_Y (uint8_t * dest, uint8_t * src, int src_width,
int n, int *accumulator, int increment)
{
uint32_t vals[2];
int acc = *accumulator;
int i;
int j;
int x;
vals[0] = *accumulator;
vals[1] = increment;
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff;
if (src_width % 2 == 0) {
oil_resample_linear_u8 (dest, src, n, vals);
} else if (src_width > 1) {
if (n > 1)
oil_resample_linear_u8 (dest, src, n - 1, vals);
dest[n - 1] = src[vals[0] >> 16];
vals[0] += increment;
} else {
oil_splat_u8 (dest, 1, &src[0], n);
if (j + 1 < src_width)
dest[i] = (src[j] * (65536 - x) + src[j + 1] * x) >> 16;
else
dest[i] = src[j];
acc += increment;
}
*accumulator = vals[0];
*accumulator = acc;
}
void