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videoscale: Don't read after the end of a line when lineary scaling YUYV/UYVY/RGB/RGBA

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This case is for upscaling a frame with width=1
Partially fixes bug #577054.
This commit is contained in:
Sebastian Dröge 2009-03-28 11:45:41 +01:00
parent b69231ad21
commit 8eb3572eef
1 changed files with 60 additions and 18 deletions
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60
gst/videoscale/vs_scanline.c
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@ -123,10 +123,12 @@ vs_scanline_resample_nearest_RGBA (uint8_t * dest, uint8_t * src, int n,
*accumulator = acc;
}
#include <stdio.h>
void
vs_scanline_resample_linear_RGBA (uint8_t * dest, uint8_t * src, int n,
int *accumulator, int increment)
{
if (increment != 0) {
uint32_t vals[2];
vals[0] = *accumulator;
@ -135,6 +137,16 @@ vs_scanline_resample_linear_RGBA (uint8_t * dest, uint8_t * src, int n,
oil_resample_linear_argb ((uint32_t *) dest, (uint32_t *) src, n, vals);
*accumulator = vals[0];
} else {
int i;
for (i = 0; i < n; i++) {
dest[4 * i + 0] = src[0];
dest[4 * i + 1] = src[1];
dest[4 * i + 2] = src[2];
dest[4 * i + 3] = src[3];
}
}
}
void
@ -193,15 +205,26 @@ vs_scanline_resample_linear_RGB (uint8_t * dest, uint8_t * src, int n,
int j;
int x;
if (increment != 0) {
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff;
dest[i * 3 + 0] = (src[j * 3 + 0] * (65536 - x) + src[j * 3 + 3] * x) >> 16;
dest[i * 3 + 1] = (src[j * 3 + 1] * (65536 - x) + src[j * 3 + 4] * x) >> 16;
dest[i * 3 + 2] = (src[j * 3 + 2] * (65536 - x) + src[j * 3 + 5] * x) >> 16;
dest[i * 3 + 0] =
(src[j * 3 + 0] * (65536 - x) + src[j * 3 + 3] * x) >> 16;
dest[i * 3 + 1] =
(src[j * 3 + 1] * (65536 - x) + src[j * 3 + 4] * x) >> 16;
dest[i * 3 + 2] =
(src[j * 3 + 2] * (65536 - x) + src[j * 3 + 5] * x) >> 16;
acc += increment;
}
} else {
for (i = 0; i < n; i++) {
dest[i * 3 + 0] = src[0];
dest[i * 3 + 1] = src[1];
dest[i * 3 + 2] = src[2];
}
}
*accumulator = acc;
}
@ -276,12 +299,17 @@ vs_scanline_resample_linear_YUYV (uint8_t * dest, uint8_t * src, int n,
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff;
dest[i * 4 + 0] = (src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
if (increment != 0)
dest[i * 4 + 0] =
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
else
dest[i * 4 + 0] = src[0];
j = acc >> 17;
x = acc & 0x1ffff;
if (i < n - 1) {
if (i < n - 1 && increment != 0) {
dest[i * 4 + 1] =
(src[j * 4 + 1] * (131072 - x) + src[j * 4 + 5] * x) >> 17;
dest[i * 4 + 3] =
@ -295,7 +323,12 @@ vs_scanline_resample_linear_YUYV (uint8_t * dest, uint8_t * src, int n,
j = acc >> 16;
x = acc & 0xffff;
dest[i * 4 + 2] = (src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
if (increment != 0)
dest[i * 4 + 2] =
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
else
dest[i * 4 + 2] = src[0];
acc += increment;
}
@ -381,12 +414,17 @@ vs_scanline_resample_linear_UYVY (uint8_t * dest, uint8_t * src, int n,
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff;
dest[i * 4 + 1] = (src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
if (increment != 0)
dest[i * 4 + 1] =
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
else
dest[i * 4 + 1] = src[1];
j = acc >> 17;
x = acc & 0x1ffff;
if (i < n - 1) {
if (i < n - 1 && increment != 0) {
dest[i * 4 + 0] =
(src[j * 4 + 0] * (131072 - x) + src[j * 4 + 4] * x) >> 17;
dest[i * 4 + 2] =
@ -400,7 +438,11 @@ vs_scanline_resample_linear_UYVY (uint8_t * dest, uint8_t * src, int n,
j = acc >> 16;
x = acc & 0xffff;
dest[i * 4 + 3] = (src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
if (increment != 0)
dest[i * 4 + 3] =
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
else
dest[i * 4 + 3] = src[1];
acc += increment;
}