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dvbsuboverlay: Fix using alpha values in blitting.

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Use each pixel's own alpha value instead of average alpha value when
calculating color components. Fixes bug #639763.
This commit is contained in:
Raimo Järvi 2011-03-17 20:19:27 +02:00 committed by Sebastian Dröge
parent 9c554b7378
commit 9e7d1ba888
1 changed files with 26 additions and 28 deletions
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54
gst/dvbsuboverlay/gstdvbsuboverlay.c
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@ -547,32 +547,32 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff;
y1 = (color >> 16) & 0xff;
u1 = (color >> 8) & 0xff;
v1 = color & 0xff;
u1 = ((color >> 8) & 0xff) * a1;
v1 = (color & 0xff) * a1;
color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + ((sx +
xstep) >> 16)]];
a2 = (color >> 24) & 0xff;
y2 = (color >> 16) & 0xff;
u2 = (color >> 8) & 0xff;
v2 = color & 0xff;
u2 = ((color >> 8) & 0xff) * a2;
v2 = (color & 0xff) * a2;
color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
(sx >> 16)]];
a3 = (color >> 24) & 0xff;
y3 = (color >> 16) & 0xff;
u3 = (color >> 8) & 0xff;
v3 = color & 0xff;
u3 = ((color >> 8) & 0xff) * a3;
v3 = (color & 0xff) * a3;
color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
((sx + xstep) >> 16)]];
a4 = (color >> 24) & 0xff;
y4 = (color >> 16) & 0xff;
u4 = (color >> 8) & 0xff;
v4 = color & 0xff;
u4 = ((color >> 8) & 0xff) * a4;
v4 = (color & 0xff) * a4;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y[1] = (a2 * y2 + (255 - a2) * dst_y[1]) / 255;
@ -580,10 +580,8 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
dst_y2[1] = (a4 * y4 + (255 - a4) * dst_y2[1]) / 255;
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;
dst_u[0] = ((u1 + u2 + u3 + u4) / 4 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = ((v1 + v2 + v3 + v4) / 4 + (255 - a1) * dst_v[0]) / 255;
dst_y += 2;
dst_y2 += 2;
@ -598,23 +596,23 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff;
y1 = (color >> 16) & 0xff;
u1 = (color >> 8) & 0xff;
v1 = color & 0xff;
u1 = ((color >> 8) & 0xff) * a1;
v1 = (color & 0xff) * a1;
color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
(sx >> 16)]];
a3 = (color >> 24) & 0xff;
y3 = (color >> 16) & 0xff;
u3 = (color >> 8) & 0xff;
v3 = color & 0xff;
u3 = ((color >> 8) & 0xff) * a3;
v3 = (color & 0xff) * a3;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y2[0] = (a3 * y3 + (255 - a3) * dst_y2[0]) / 255;
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;
dst_u[0] = ((u1 + u3) / 2 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = ((v1 + v3) / 2 + (255 - a1) * dst_v[0]) / 255;
dst_y += 1;
dst_y2 += 1;
@ -639,23 +637,23 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff;
y1 = (color >> 16) & 0xff;
u1 = (color >> 8) & 0xff;
v1 = color & 0xff;
u1 = ((color >> 8) & 0xff) * a1;
v1 = (color & 0xff) * a1;
color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + ((sx +
xstep) >> 16)]];
a2 = (color >> 24) & 0xff;
y2 = (color >> 16) & 0xff;
u2 = (color >> 8) & 0xff;
v2 = color & 0xff;
u2 = ((color >> 8) & 0xff) * a2;
v2 = (color & 0xff) * a2;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_y[1] = (a2 * y2 + (255 - a2) * dst_y[1]) / 255;
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;
dst_u[0] = ((u1 + u2) / 2 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = ((v1 + v2) / 2 + (255 - a1) * dst_v[0]) / 255;
dst_y += 2;
dst_u += 1;
@ -669,13 +667,13 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff;
y1 = (color >> 16) & 0xff;
u1 = (color >> 8) & 0xff;
v1 = color & 0xff;
u1 = ((color >> 8) & 0xff) * a1;
v1 = (color & 0xff) * a1;
dst_y[0] = (a1 * y1 + (255 - a1) * dst_y[0]) / 255;
dst_u[0] = (a1 * u1 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * v1 + (255 - a1) * dst_v[0]) / 255;
dst_u[0] = (u1 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (v1 + (255 - a1) * dst_v[0]) / 255;
dst_y += 1;
dst_u += 1;