mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-18 14:26:43 +00:00
Code Issues 1 Projects Releases Wiki Activity

videomixer: Fix I420 blending to actually do something

Browse source 
For this we a) implement the checkers filling and b)
actually blend the src/dest by using the src alpha value
from the pad.
This commit is contained in:
Sebastian Dröge 2009-05-28 13:35:52 +02:00
parent ad1f79fd81
commit 699b696db8
1 changed files with 33 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
gst/videomixer/blend_i420.c
View file

@ -185,13 +185,18 @@
inline static void inline static void
gst_i420_do_blend (guint8 * src, guint8 * dest, gst_i420_do_blend (guint8 * src, guint8 * dest,
gint src_stride, gint dest_stride, gint src_width, gint src_height) gint src_stride, gint dest_stride, gint src_width, gint src_height,
gint dest_width, gdouble src_alpha)
{ {
int i; int i, j;
for (i = 0; i < src_height; i++) { for (i = 0; i < src_height; i++) {
memcpy (dest, src, src_width); for (j = 0; j < src_width; j++) {
src += src_stride; *dest = src_alpha * (*dest) + (1. - src_alpha) * (*src);
dest += dest_stride; dest++;
src++;
}
src += src_stride - src_width;
dest += dest_stride - dest_width;
} }
} }
@ -246,7 +251,8 @@ gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
gst_i420_do_blend (b_src + xoffset + yoffset * VIDEO_Y_ROWSTRIDE (src_width), gst_i420_do_blend (b_src + xoffset + yoffset * VIDEO_Y_ROWSTRIDE (src_width),
b_dest + xpos + ypos * VIDEO_Y_ROWSTRIDE (dest_width), b_dest + xpos + ypos * VIDEO_Y_ROWSTRIDE (dest_width),
VIDEO_Y_ROWSTRIDE (src_width), VIDEO_Y_ROWSTRIDE (src_width),
VIDEO_Y_ROWSTRIDE (dest_width), b_src_width, b_src_height); VIDEO_Y_ROWSTRIDE (dest_width), b_src_width, b_src_height,
dest_width, src_alpha);
b_src = src + VIDEO_U_OFFSET (src_width, src_height); b_src = src + VIDEO_U_OFFSET (src_width, src_height);
b_dest = dest + VIDEO_U_OFFSET (dest_width, dest_height); b_dest = dest + VIDEO_U_OFFSET (dest_width, dest_height);
@ -255,7 +261,8 @@ gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
yoffset / 2 * VIDEO_U_ROWSTRIDE (src_width), yoffset / 2 * VIDEO_U_ROWSTRIDE (src_width),
b_dest + xpos / 2 + ypos / 2 * VIDEO_U_ROWSTRIDE (dest_width), b_dest + xpos / 2 + ypos / 2 * VIDEO_U_ROWSTRIDE (dest_width),
VIDEO_U_ROWSTRIDE (src_width), VIDEO_U_ROWSTRIDE (dest_width), VIDEO_U_ROWSTRIDE (src_width), VIDEO_U_ROWSTRIDE (dest_width),
b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2); b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
src_alpha);
b_src = src + VIDEO_V_OFFSET (src_width, src_height); b_src = src + VIDEO_V_OFFSET (src_width, src_height);
b_dest = dest + VIDEO_V_OFFSET (dest_width, dest_height); b_dest = dest + VIDEO_V_OFFSET (dest_width, dest_height);
@ -264,7 +271,8 @@ gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
yoffset / 2 * VIDEO_V_ROWSTRIDE (src_width), yoffset / 2 * VIDEO_V_ROWSTRIDE (src_width),
b_dest + xpos / 2 + ypos / 2 * VIDEO_V_ROWSTRIDE (dest_width), b_dest + xpos / 2 + ypos / 2 * VIDEO_V_ROWSTRIDE (dest_width),
VIDEO_V_ROWSTRIDE (src_width), VIDEO_V_ROWSTRIDE (dest_width), VIDEO_V_ROWSTRIDE (src_width), VIDEO_V_ROWSTRIDE (dest_width),
b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2); b_src_width / 2, GST_ROUND_UP_2 (b_src_height) / 2, dest_width / 2,
src_alpha);
} }
#undef BLEND_MODE #undef BLEND_MODE
@ -273,8 +281,23 @@ gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos,
void void
gst_videomixer_fill_i420_checker (guint8 * dest, gint width, gint height) gst_videomixer_fill_i420_checker (guint8 * dest, gint width, gint height)
{ {
//TODO: implementation of this method in i420mixer.c was for AYUV, which has 32bpp ans is packed int size;
//I420 has 12 bpp and is planar gint i, j;
static int tab[] = { 80, 160, 80, 160 };
guint8 *p = dest;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
*p++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)];
}
p += VIDEO_Y_ROWSTRIDE (width) - width;
}
size = (VIDEO_U_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_U_OFFSET (width, height), 0x80, size);
size = (VIDEO_V_ROWSTRIDE (width) * height) / 2;
memset (dest + VIDEO_V_OFFSET (width, height), 0x80, size);
} }
void void