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dvbsuboverlay: implement display definition segment subtitle windows

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simplifies subtitle scaling in blit_i420()
This commit is contained in:
Janne Grunau 2010-12-14 11:11:08 +01:00 committed by Sebastian Dröge
parent 4d8220b033
commit 36b101cfb8
1 changed files with 32 additions and 6 deletions
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38
gst/dvbsuboverlay/gstdvbsuboverlay.c
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@ -488,6 +488,8 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
gint y_offset, y_height, y_width, y_stride;
gint u_offset, u_height, u_width, u_stride;
gint v_offset, v_height, v_width, v_stride;
gint scale = 0;
gint scale_x, scale_y; /* 16.16 fixed point */
y_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0, width,
@ -517,6 +519,18 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);
v_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 2, width);
if (width != subs->display_def.display_width &&
height != subs->display_def.display_height) {
scale = 1;
if (subs->display_def.window_flag) {
scale_x = (width << 16) / subs->display_def.window_width;
scale_y = (height << 16) / subs->display_def.window_height;
} else {
scale_x = (width << 16) / subs->display_def.display_width;
scale_y = (height << 16) / subs->display_def.display_height;
}
}
for (counter = 0; counter < subs->num_rects; counter++) {
gint dw, dh, dx, dy;
gint32 sx = 0, sy; /* 16.16 fixed point */
@ -527,13 +541,25 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
continue;
/* blend subtitles onto the video frame */
dx = sub_region->x * width / subs->display_def.display_width;
dy = sub_region->y * height / subs->display_def.display_height;
dx = sub_region->x;
dy = sub_region->y;
dw = sub_region->w;
dh = sub_region->h;
dw = MIN (sub_region->w * width / subs->display_def.display_width,
width - dx);
dh = MIN (sub_region->h * height / subs->display_def.display_height,
height - dy);
if (scale) {
dx = (dx * scale_x) >> 16;
dy = (dy * scale_y) >> 16;
dw = (dw * scale_x) >> 16;
dh = (dh * scale_y) >> 16;
/* apply subtitle window offsets after scaling */
if (subs->display_def.window_flag) {
dx += subs->display_def.window_x;
dy += subs->display_def.window_y;
}
}
dw = MIN (dw, width - dx);
dh = MIN (dh, height - dx);
xstep = (sub_region->w << 16) / dw;
ystep = (sub_region->h << 16) / dh;