mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-17 19:55:32 +00:00
Code Issues 1 Projects Releases Wiki Activity

videoscale: Take the next luma value instead of every second next when scaling UYVY and friends

Browse source
This commit is contained in:
Sebastian Dröge 2009-03-27 19:12:49 +01:00
parent 12bbcc4db9
commit 96b9ec4da0
1 changed files with 45 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

48
gst/videoscale/vs_4tap.c
View file

@ -471,7 +471,27 @@ vs_scanline_resample_4tap_YUYV (uint8_t * dest, uint8_t * src,
j = acc >> 16;
x = (acc & 0xffff) >> 8;
for (off = 0; off < 4; off++) {
for (off = 0; off < 4; off += 2) {
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * src[MAX (j * 4 + off - 2, 0)];
y += vs_4tap_taps[x][1] * src[j * 4 + off];
y += vs_4tap_taps[x][2] * src[j * 4 + off + 2];
y += vs_4tap_taps[x][3] * src[j * 4 + off + 4];
} else {
y = vs_4tap_taps[x][0] * src[CLAMP (j * 4 + off - 2, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][1] * src[CLAMP (j * 4 + off, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][2] * src[CLAMP (j * 4 + off + 2, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][3] * src[CLAMP (j * 4 + off + 4, 0,
4 * (src_width - 1) + off)];
}
y += (1 << (SHIFT - 1));
dest[i * 4 + off] = CLAMP (y >> SHIFT, 0, 255);
}
for (off = 1; off < 4; off += 2) {
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * src[MAX ((j - 1) * 4 + off, 0)];
y += vs_4tap_taps[x][1] * src[j * 4 + off];
@ -490,6 +510,7 @@ vs_scanline_resample_4tap_YUYV (uint8_t * dest, uint8_t * src,
y += (1 << (SHIFT - 1));
dest[i * 4 + off] = CLAMP (y >> SHIFT, 0, 255);
}
acc += increment;
}
*xacc = acc;
@ -594,7 +615,7 @@ vs_scanline_resample_4tap_UYVY (uint8_t * dest, uint8_t * src,
j = acc >> 16;
x = (acc & 0xffff) >> 8;
for (off = 0; off < 4; off++) {
for (off = 0; off < 4; off += 2) {
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * src[MAX ((j - 1) * 4 + off, 0)];
y += vs_4tap_taps[x][1] * src[j * 4 + off];
@ -613,6 +634,27 @@ vs_scanline_resample_4tap_UYVY (uint8_t * dest, uint8_t * src,
y += (1 << (SHIFT - 1));
dest[i * 4 + off] = CLAMP (y >> SHIFT, 0, 255);
}
for (off = 1; off < 4; off += 2) {
if (j - 1 >= 0 && j + 2 < src_width) {
y = vs_4tap_taps[x][0] * src[MAX (j * 4 + off - 2, 0)];
y += vs_4tap_taps[x][1] * src[j * 4 + off];
y += vs_4tap_taps[x][2] * src[j * 4 + off + 2];
y += vs_4tap_taps[x][3] * src[j * 4 + off + 4];
} else {
y = vs_4tap_taps[x][0] * src[CLAMP (j * 4 + off - 2, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][1] * src[CLAMP (j * 4 + off, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][2] * src[CLAMP (j * 4 + off + 2, 0,
4 * (src_width - 1) + off)];
y += vs_4tap_taps[x][3] * src[CLAMP (j * 4 + off + 4, 0,
4 * (src_width - 1) + off)];
}
y += (1 << (SHIFT - 1));
dest[i * 4 + off] = CLAMP (y >> SHIFT, 0, 255);
}
acc += increment;
}
*xacc = acc;
@ -893,7 +935,7 @@ vs_image_scale_4tap_RGB565 (const VSImage * dest, const VSImage * src,
#define RGB555_B(x) (((x)&0x001f)<<3 | ((x)&0x001f)>>2)
#define RGB555(r,g,b) \
((((r)<<7)&0x7c00) | (((g)<<3)&0x03e0) | (((b)>>3)&0x001f))
((((r)<<7)&0x7c00) | (((g)<<2)&0x03e0) | (((b)>>3)&0x001f))
void
vs_scanline_resample_4tap_RGB555 (uint8_t * dest_u8, uint8_t * src_u8,