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gst/videoscale/vs_4tap.c: Fix valgrind error on 4tap scaling method.

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Original commit message from CVS:
* gst/videoscale/vs_4tap.c:
Fix valgrind error on 4tap scaling method.
This commit is contained in:
David Schleef 2008-01-14 01:19:34 +00:00
parent db4d879623
commit 5aad3658f8
2 changed files with 33 additions and 22 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-01-13 David Schleef <ds@schleef.org>
* gst/videoscale/vs_4tap.c:
Fix valgrind error on 4tap scaling method.
2008-01-13 Sebastien Moutte <sebastien@moutte.net>
* gst-libs/gst/sdp/gstsdpmessage.c: (is_multicast_address):

50
gst/videoscale/vs_4tap.c
View file

@ -95,7 +95,7 @@ vs_4tap_init (void)
void
vs_scanline_resample_4tap_Y (uint8_t * dest, uint8_t * src,
int n, int *xacc, int increment)
int n, int src_width, int *xacc, int increment)
{
int i;
int j;
@ -107,15 +107,19 @@ vs_scanline_resample_4tap_Y (uint8_t * dest, uint8_t * src,
for (i = 0; i < n; i++) {
j = acc >> 16;
x = (acc & 0xff00) >> 8;
y = (vs_4tap_taps[x][0] * src[MAX (j - 1, 0)] +
vs_4tap_taps[x][1] * src[j] +
vs_4tap_taps[x][2] * src[j + 1] +
vs_4tap_taps[x][3] * src[j + 2] + (1 << (SHIFT - 1))) >> SHIFT;
if (y < 0)
y = 0;
if (y > 255)
y = 255;
dest[i] = y;
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * src[MAX (j - 1, 0)];
y += vs_4tap_taps[x][1] * src[j];
y += vs_4tap_taps[x][2] * src[j + 1];
y += vs_4tap_taps[x][3] * src[j + 2];
} else {
y = vs_4tap_taps[x][0] * src[CLAMP (j - 1, 0, src_width - 1)];
y += vs_4tap_taps[x][1] * src[CLAMP (j, 0, src_width - 1)];
y += vs_4tap_taps[x][2] * src[CLAMP (j + 1, 0, src_width - 1)];
y += vs_4tap_taps[x][3] * src[CLAMP (j + 2, 0, src_width - 1)];
}
y += (1 << (SHIFT - 1));
dest[i] = CLAMP (y >> SHIFT, 0, 255);
acc += increment;
}
*xacc = acc;
@ -127,20 +131,21 @@ vs_scanline_merge_4tap_Y (uint8_t * dest, uint8_t * src1, uint8_t * src2,
{
int i;
int y;
int a, b, c, d;
acc = (acc >> 8) & 0xff;
a = vs_4tap_taps[acc][0];
b = vs_4tap_taps[acc][1];
c = vs_4tap_taps[acc][2];
d = vs_4tap_taps[acc][3];
for (i = 0; i < n; i++) {
y = (vs_4tap_taps[acc][0] * src1[i] +
vs_4tap_taps[acc][1] * src2[i] +
vs_4tap_taps[acc][2] * src3[i] +
vs_4tap_taps[acc][3] * src4[i] + (1 << (SHIFT - 1))) >> SHIFT;
if (y < 0)
y = 0;
if (y > 255)
y = 255;
dest[i] = y;
y = a * src1[i];
y += b * src2[i];
y += c * src3[i];
y += d * src4[i];
y += (1 << (SHIFT - 1));
dest[i] = CLAMP (y >> SHIFT, 0, 255);
}
}
@ -163,7 +168,8 @@ vs_image_scale_4tap_Y (const VSImage * dest, const VSImage * src,
for (i = 0; i < 4; i++) {
xacc = 0;
vs_scanline_resample_4tap_Y (tmpbuf + i * dest->width,
src->pixels + i * src->stride, dest->width, &xacc, x_increment);
src->pixels + i * src->stride, dest->width, src->width,
&xacc, x_increment);
}
yacc = 0;
@ -178,7 +184,7 @@ vs_image_scale_4tap_Y (const VSImage * dest, const VSImage * src,
xacc = 0;
vs_scanline_resample_4tap_Y (tmpbuf + ((k + 3) & 3) * dest->width,
src->pixels + (k + 3) * src->stride,
dest->width, &xacc, x_increment);
dest->width, src->width, &xacc, x_increment);
}
}