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cairorender: Add support for ARGB/BGRA input

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Note that videotestsrc outputs 100% transparent video
which will result in white output from cairorender.
This commit is contained in:
Sebastian Dröge 2009-07-20 08:07:13 +02:00
parent 085f87d85f
commit 9d9d08622b
1 changed files with 43 additions and 4 deletions
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47
ext/cairo/gstcairorender.c
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@ -137,9 +137,41 @@ gst_cairo_render_chain (GstPad * pad, GstBuffer * buf)
if (c->png) {
GST_BUFFER_OFFSET (buf) = 0;
s = cairo_image_surface_create_from_png_stream (read_buffer, buf);
} else
} else {
if (c->format == CAIRO_FORMAT_ARGB32) {
guint i, j;
guint8 *data = GST_BUFFER_DATA (buf);
buf = gst_buffer_make_writable (buf);
/* Cairo ARGB is pre-multiplied with the alpha
* value, i.e. 0x80008000 is half transparent
* green
*/
for (i = 0; i < c->height; i++) {
for (j = 0; j < c->width; j++) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
guint8 alpha = data[3];
data[0] = (data[0] * alpha) >> 8;
data[1] = (data[1] * alpha) >> 8;
data[2] = (data[2] * alpha) >> 8;
#else
guint8 alpha = data[0];
data[1] = (data[1] * alpha) >> 8;
data[2] = (data[2] * alpha) >> 8;
data[3] = (data[3] * alpha) >> 8;
#endif
data += 4;
}
}
}
s = cairo_image_surface_create_for_data (GST_BUFFER_DATA (buf),
c->format, c->width, c->height, c->stride);
}
success = gst_cairo_render_push_surface (c, s);
gst_buffer_unref (buf);
return success ? GST_FLOW_OK : GST_FLOW_ERROR;
@ -170,7 +202,14 @@ gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
c->format = CAIRO_FORMAT_A8;
c->stride = GST_ROUND_UP_4 (c->width);
} else if (!strcmp (mime, "video/x-raw-rgb")) {
c->format = CAIRO_FORMAT_RGB24;
gint bpp;
if (!gst_structure_get_int (s, "bpp", &bpp)) {
GST_ERROR_OBJECT (c, "Invalid caps");
return FALSE;
}
c->format = (bpp == 32) ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24;
c->stride = 4 * c->width;
} else {
GST_DEBUG_OBJECT (c, "Unknown mime type '%s'.", mime);
@ -255,9 +294,9 @@ static GstStaticPadTemplate t_src = GST_STATIC_PAD_TEMPLATE ("src",
static GstStaticPadTemplate t_snk = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
GST_VIDEO_CAPS_BGRx " ; "
GST_VIDEO_CAPS_BGRx " ; " GST_VIDEO_CAPS_BGRA " ; "
#else
GST_VIDEO_CAPS_xRGB " ; "
GST_VIDEO_CAPS_xRGB " ; " GST_VIDEO_CAPS_ARGB " ; "
#endif
GST_VIDEO_CAPS_YUV ("Y800") " ; "
"video/x-raw-gray, "