mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-27 20:21:24 +00:00
Code Issues 1 Projects Releases Wiki Activity

dvbsuboverlay: Refactor blending function and take average of all chroma values

Browse source
This commit is contained in:
Sebastian Dröge 2010-12-06 16:44:11 +01:00 committed by Edward Hervey
parent 2282a08890
commit e25a1dc0cc
1 changed files with 112 additions and 110 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

222
gst/dvbsuboverlay/gstdvbsuboverlay.c
View file

@ -472,11 +472,14 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
{
guint counter;
DVBSubtitleRect *sub_region;
gint alpha, alpha2, r, g, b, r2, g2, b2, k, k2;
gint Y, U, V, Y2, U2, V2;
guint32 color, color2;
const guint8 *src;
guint8 *dst_y, *dst_u, *dst_v;
gint r, g, b;
gint a1, a2, a3, a4;
gint y1, y2, y3, y4;
gint u1, u2, u3, u4;
gint v1, v2, v3, v4;
guint32 color;
const guint8 *src, *src2;
guint8 *dst_y, *dst_y2, *dst_u, *dst_v;
gint x, y, w, h;
gint w2, h2;
gint width = overlay->width;
@ -529,7 +532,11 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
src_stride = sub_region->pict.rowstride;
src = sub_region->pict.data;
src2 = sub_region->pict.data + src_stride;
dst_y = buffer->data + y_offset + sub_region->y * y_stride + sub_region->x;
dst_y2 =
buffer->data + y_offset + (sub_region->y + 1) * y_stride +
sub_region->x;
dst_u =
buffer->data + u_offset + ((sub_region->y + 1) / 2) * u_stride +
(sub_region->x + 1) / 2;
@ -537,174 +544,169 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
buffer->data + v_offset + ((sub_region->y + 1) / 2) * v_stride +
(sub_region->x + 1) / 2;
/* FIXME: This whole blending business will need a refactor */
/* FIXME: Also interpolation for Cr and Cb channels missing */
for (y = 0; y < h - 1; y += 2) {
for (x = 0; x < w - 1; x += 2) {
color = sub_region->pict.palette[src[0]];
alpha = (color >> 24) & 0xff;
a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
y1 = rgb_to_y (r, g, b);
u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b);
color2 = sub_region->pict.palette[src[1]];
alpha2 = (color2 >> 24) & 0xff;
r2 = (color2 >> 16) & 0xff;
g2 = (color2 >> 8) & 0xff;
b2 = color2 & 0xff;
Y2 = rgb_to_y (r2, g2, b2);
U2 = rgb_to_u (r2, g2, b2);
V2 = rgb_to_v (r2, g2, b2);
k = alpha;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
k = alpha2;
k2 += k;
dst_y[1] = (k * Y2 + (255 - k) * dst_y[1]) / 255;
src += src_stride;
dst_y += y_stride;
color = sub_region->pict.palette[src[0]];
alpha = (color >> 24) & 0xff;
color = sub_region->pict.palette[src[1]];
a2 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
y2 = rgb_to_y (r, g, b);
u2 = rgb_to_u (r, g, b);
v2 = rgb_to_v (r, g, b);
color2 = sub_region->pict.palette[src[1]];
alpha2 = (color2 >> 24) & 0xff;
r2 = (color2 >> 16) & 0xff;
g2 = (color2 >> 8) & 0xff;
b2 = color2 & 0xff;
color = sub_region->pict.palette[src2[0]];
a3 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y2 = rgb_to_y (r2, g2, b2);
U2 = rgb_to_u (r2, g2, b2);
V2 = rgb_to_v (r2, g2, b2);
y3 = rgb_to_y (r, g, b);
u3 = rgb_to_u (r, g, b);
v3 = rgb_to_v (r, g, b);
k = alpha;
k2 += k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
color = sub_region->pict.palette[src2[1]];
a4 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
k = alpha2;
k2 += k;
dst_y[1] = (k * Y2 + (255 - k) * dst_y[1]) / 255;
y4 = rgb_to_y (r, g, b);
u4 = rgb_to_u (r, g, b);
v4 = rgb_to_v (r, g, b);
k2 /= 4;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y[1] = (a2 * y2 + (255 - a2) * dst_y[1]) / 255;
dst_y2[0] = (a3 * y3 + (255 - a3) * dst_y2[0]) / 255;
dst_y2[1] = (a4 * y4 + (255 - a4) * dst_y2[1]) / 255;
src += -src_stride + 2;
dst_y += -y_stride + 2;
a1 = (a1 + a2 + a3 + a4) / 4;
dst_u[0] =
(a1 * ((u1 + u2 + u3 + u4) / 4) + (255 - a1) * dst_u[0]) / 255;
dst_v[0] =
(a1 * ((v1 + v2 + v3 + v4) / 4) + (255 - a1) * dst_v[0]) / 255;
src += 2;
src2 += 2;
dst_y += 2;
dst_y2 += 2;
dst_u += 1;
dst_v += 1;
}
/* Odd width */
if (x < w) {
color = sub_region->pict.palette[src[0]];
alpha = (color >> 24) & 0xff;
a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
y1 = rgb_to_y (r, g, b);
u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b);
k = alpha;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
color = sub_region->pict.palette[src2[0]];
a3 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
src += src_stride;
dst_y += y_stride;
y3 = rgb_to_y (r, g, b);
u3 = rgb_to_u (r, g, b);
v3 = rgb_to_v (r, g, b);
k = alpha;
k2 += k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y2[0] = (a3 * y3 + (255 - a3) * dst_y2[0]) / 255;
k2 /= 2;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
a1 = (a1 + a3) / 2;
dst_u[0] = (a1 * ((u1 + u3) / 2) + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * ((v1 + v3) / 2) + (255 - a1) * dst_v[0]) / 255;
src += -src_stride + 1;
dst_y += -y_stride + 1;
src += 1;
src2 += 1;
dst_y += 1;
dst_y2 += 1;
dst_u += 1;
dst_v += 1;
}
src += src_stride + (src_stride - w);
src2 += src_stride + (src_stride - w);
dst_y += y_stride + (y_stride - w);
dst_y2 += y_stride + (y_stride - w);
dst_u += u_stride - w2;
dst_v += v_stride - w2;
}
/* Odd height */
if (y < h) {
for (x = 0; x < w - 1; x += 2) {
color = sub_region->pict.palette[src[0]];
alpha = (color >> 24) & 0xff;
a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
y1 = rgb_to_y (r, g, b);
u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b);
color2 = sub_region->pict.palette[src[1]];
alpha2 = (color2 >> 24) & 0xff;
r2 = (color2 >> 16) & 0xff;
g2 = (color2 >> 8) & 0xff;
b2 = color2 & 0xff;
color = sub_region->pict.palette[src[1]];
a2 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y2 = rgb_to_y (r2, g2, b2);
U2 = rgb_to_u (r2, g2, b2);
V2 = rgb_to_v (r2, g2, b2);
y2 = rgb_to_y (r, g, b);
u2 = rgb_to_u (r, g, b);
v2 = rgb_to_v (r, g, b);
k = alpha;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y[1] = (a2 * y2 + (255 - a2) * dst_y[1]) / 255;
k = alpha2;
k2 += k;
dst_y[1] = (k * Y2 + (255 - k) * dst_y[1]) / 255;
k2 /= 2;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u++;
dst_v++;
a1 = (a1 + a2) / 2;
dst_u[0] = (a1 * ((u1 + u2) / 2) + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * ((v1 + v2) / 2) + (255 - a1) * dst_v[0]) / 255;
src += 2;
dst_y += 2;
dst_u += 1;
dst_v += 1;
}
/* Odd height and width */
if (x < w) {
color = sub_region->pict.palette[src[0]];
alpha = (color >> 24) & 0xff;
a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff;
b = color & 0xff;
Y = rgb_to_y (r, g, b);
U = rgb_to_u (r, g, b);
V = rgb_to_v (r, g, b);
y1 = rgb_to_y (r, g, b);
u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b);
k = alpha;
k2 = k;
dst_y[0] = (k * Y + (255 - k) * dst_y[0]) / 255;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_u[0] = (k2 * U + (255 - k2) * dst_u[0]) / 255;
dst_v[0] = (k2 * V + (255 - k2) * dst_v[0]) / 255;
dst_u[0] = (a1 * u1 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * v1 + (255 - a1) * dst_v[0]) / 255;
src += 1;
dst_y += 1;
dst_u += 1;
dst_v += 1;
}
}
}