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textoverlay: implement background shading for IYU1

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https://bugzilla.gnome.org/show_bug.cgi?id=687817
This commit is contained in:
Tim-Philipp Müller 2012-11-07 13:59:53 +00:00
parent bd578c1dd4
commit ba255fbac6
1 changed files with 31 additions and 0 deletions
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31
ext/pango/gstbasetextoverlay.c
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@ -1540,6 +1540,34 @@ gst_base_text_overlay_shade_rgb24 (GstBaseTextOverlay * overlay,
}
}
static void
gst_base_text_overlay_shade_IYU1 (GstBaseTextOverlay * overlay,
GstVideoFrame * frame, gint x0, gint x1, gint y0, gint y1)
{
gint y, x, stride, shading_val, tmp;
guint8 *p;
shading_val = overlay->shading_value;
stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
/* IYU1: packed 4:1:1 YUV (Cb-Y0-Y1-Cr-Y2-Y3 ...) */
for (y = y0; y < y1; ++y) {
p = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
/* move to Y0 or Y1 (we pretend the chroma is the last of the 3 bytes) */
/* FIXME: we're not pixel-exact here if x0 is an odd number, but it's
* unlikely anyone will notice.. */
p += (y * stride) + ((x0 / 2) * 3) + 1;
for (x = x0; x < x1; x += 2) {
tmp = *p + shading_val;
*p++ = CLAMP (tmp, 0, 255);
tmp = *p + shading_val;
*p++ = CLAMP (tmp, 0, 255);
/* skip chroma */
p++;
}
}
}
#define ARGB_SHADE_FUNCTION(name, OFFSET) \
static inline void \
gst_base_text_overlay_shade_##name (GstBaseTextOverlay * overlay, GstVideoFrame * dest, \
@ -1661,6 +1689,9 @@ gst_base_text_overlay_shade_background (GstBaseTextOverlay * overlay,
case GST_VIDEO_FORMAT_RGB:
gst_base_text_overlay_shade_rgb24 (overlay, frame, x0, x1, y0, y1);
break;
case GST_VIDEO_FORMAT_IYU1:
gst_base_text_overlay_shade_IYU1 (overlay, frame, x0, x1, y0, y1);
break;
default:
GST_FIXME_OBJECT (overlay, "implement background shading for format %s",
gst_video_format_to_string (GST_VIDEO_FRAME_FORMAT (frame)));