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videoscale: simplify YUYV and UYVY linear scaling

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Simplify the code and make it handle odd width
This commit is contained in:
Wim Taymans 2013-09-10 16:06:54 +02:00
parent ccf53052a0
commit 85c572a57e
1 changed files with 38 additions and 65 deletions
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103
gst/videoscale/vs_scanline.c
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@ -302,54 +302,40 @@ vs_scanline_resample_linear_YUYV (uint8_t * dest, uint8_t * src, int src_width,
int n, int *accumulator, int increment)
{
int acc = *accumulator;
int i;
int j;
int x;
int quads = (n + 1) / 2;
int i, j, x;
for (i = 0; i < quads; i++) {
for (i = 0; i < n; i += 2) {
j = acc >> 16;
x = acc & 0xffff;
if (j + 1 < src_width)
dest[i * 4 + 0] =
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
dest[i * 2 + 0] = BLEND (src[j * 2 + 0], src[j * 2 + 2], x);
else
dest[i * 4 + 0] = src[j * 2 + 0];
dest[i * 2 + 0] = src[j * 2 + 0];
j = acc >> 17;
x = acc & 0x1ffff;
if (2 * j + 2 < src_width)
dest[i * 4 + 1] =
(src[j * 4 + 1] * (131072 - x) + src[j * 4 + 5] * x) >> 17;
else
dest[i * 4 + 1] = src[j * 4 + 1];
if (2 * i + 1 < n && 2 * j + 1 < src_width) {
if (2 * j + 3 < src_width)
dest[i * 4 + 3] =
(src[j * 4 + 3] * (131072 - x) + src[j * 4 + 7] * x) >> 17;
else
dest[i * 4 + 3] = src[j * 4 + 3];
j >>= 1;
if (2 * (j + 1) < src_width) {
dest[i * 2 + 1] = BLEND (src[j * 4 + 1], src[j * 4 + 5], x);
dest[i * 2 + 3] = BLEND (src[j * 4 + 3], src[j * 4 + 7], x);
} else {
dest[i * 2 + 1] = src[j * 4 + 1];
dest[i * 2 + 3] = src[j * 4 + 3];
}
acc += increment;
j = acc >> 16;
x = acc & 0xffff;
if (i < n - 1) {
j = acc >> 16;
if (j + 1 < src_width) {
x = acc & 0xffff;
dest[i * 2 + 2] = BLEND (src[j * 2 + 0], src[j * 2 + 2], x);
} else
dest[i * 2 + 2] = src[j * 2 + 0];
if (2 * i + 1 < n && j < src_width) {
if (j + 1 < src_width)
dest[i * 4 + 2] =
(src[j * 2 + 0] * (65536 - x) + src[j * 2 + 2] * x) >> 16;
else
dest[i * 4 + 2] = src[j * 2 + 0];
acc += increment;
}
}
*accumulator = acc;
}
@ -419,53 +405,40 @@ vs_scanline_resample_linear_UYVY (uint8_t * dest, uint8_t * src, int src_width,
int n, int *accumulator, int increment)
{
int acc = *accumulator;
int i;
int j;
int x;
int quads = (n + 1) / 2;
int i, j, x;
for (i = 0; i < quads; i++) {
for (i = 0; i < n; i += 2) {
j = acc >> 16;
x = acc & 0xffff;
if (j + 1 < src_width)
dest[i * 4 + 1] =
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
dest[i * 2 + 1] = BLEND (src[j * 2 + 1], src[j * 2 + 3], x);
else
dest[i * 4 + 1] = src[j * 2 + 1];
dest[i * 2 + 1] = src[j * 2 + 1];
j = acc >> 17;
x = acc & 0x1ffff;
if (2 * j + 2 < src_width)
dest[i * 4 + 0] =
(src[j * 4 + 0] * (131072 - x) + src[j * 4 + 4] * x) >> 17;
else
dest[i * 4 + 0] = src[j * 4 + 0];
if (i * 2 + 1 < n && 2 * j + 1 < src_width) {
if (2 * j + 3 < src_width)
dest[i * 4 + 2] =
(src[j * 4 + 2] * (131072 - x) + src[j * 4 + 6] * x) >> 17;
else
dest[i * 4 + 2] = src[j * 4 + 2];
j >>= 1;
if (2 * (j + 1) < src_width) {
dest[i * 2 + 0] = BLEND (src[j * 4 + 0], src[j * 4 + 4], x);
dest[i * 2 + 2] = BLEND (src[j * 4 + 2], src[j * 4 + 6], x);
} else {
dest[i * 2 + 0] = src[j * 4 + 0];
dest[i * 2 + 2] = src[j * 4 + 2];
}
acc += increment;
j = acc >> 16;
x = acc & 0xffff;
if (i < n - 1) {
j = acc >> 16;
if (j + 1 < src_width) {
x = acc & 0xffff;
dest[i * 2 + 3] = BLEND (src[j * 2 + 1], src[j * 2 + 3], x);
} else
dest[i * 2 + 3] = src[j * 2 + 1];
if (2 * i + 1 < n && j < src_width) {
if (j + 1 < src_width)
dest[i * 4 + 3] =
(src[j * 2 + 1] * (65536 - x) + src[j * 2 + 3] * x) >> 16;
else
dest[i * 4 + 3] = src[j * 2 + 1];
acc += increment;
}
}
*accumulator = acc;
}
void