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gdkpixbufoverlay: add properties for positioning and sizing

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This commit is contained in:
Tim-Philipp Müller 2012-03-17 23:41:38 +00:00
parent 729a30c38b
commit fdb7ec12b4
2 changed files with 150 additions and 6 deletions
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144
ext/gdk_pixbuf/gstgdkpixbufoverlay.c
View file

@ -18,10 +18,20 @@
*/
/**
* SECTION:element-gdkpixbufoverlay
* @see_also:
*
* The gdkpixbufoverlay element overlays an image loaded from file onto
* a video stream.
*
* Changing the positioning or overlay width and height properties at runtime
* is supported, but it might be prudent to to protect the property setting
* code with GST_BASE_TRANSFORM_LOCK and GST_BASE_TRANSFORM_UNLOCK, as
* g_object_set() is not atomic for multiple properties passed in one go.
*
* Changing the image at runtime is currently not supported.
*
* Negative offsets are also not yet supported.
*
* <refsect2>
* <title>Example launch line</title>
* |[
@ -30,6 +40,8 @@
* Overlays the image in image.png onto the test video picture produced by
* videotestsrc.
* </refsect2>
*
* Since: 0.10.33
*/
#ifdef HAVE_CONFIG_H
@ -60,7 +72,13 @@ gst_gdk_pixbuf_overlay_set_caps (GstBaseTransform * trans, GstCaps * incaps,
enum
{
PROP_0,
PROP_LOCATION
PROP_LOCATION,
PROP_OFFSET_X,
PROP_OFFSET_Y,
PROP_RELATIVE_X,
PROP_RELATIVE_Y,
PROP_OVERLAY_WIDTH,
PROP_OVERLAY_HEIGHT
};
#define VIDEO_CAPS \
@ -126,8 +144,36 @@ gst_gdk_pixbuf_overlay_class_init (GstGdkPixbufOverlayClass * klass)
g_object_class_install_property (gobject_class, PROP_LOCATION,
g_param_spec_string ("location", "location",
"location of image file to overlay", "",
"location of image file to overlay", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OFFSET_X,
g_param_spec_int ("offset-x", "X Offset",
"horizontal offset of overlay image in pixels from top-left corner "
"of video image", G_MININT, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OFFSET_Y,
g_param_spec_int ("offset-y", "Y Offset",
"vertical offset of overlay image in pixels from top-left corner "
"of video image", G_MININT, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RELATIVE_X,
g_param_spec_double ("relative-x", "Relative X Offset",
"horizontal offset of overlay image in fractions of video image "
"width, from top-left corner of video image",
0.0, 1.0, 0.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RELATIVE_Y,
g_param_spec_double ("relative-y", "Relative Y Offset",
"vertical offset of overlay image in fractions of video image "
"height, from top-left corner of video image",
0.0, 1.0, 0.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH,
g_param_spec_int ("overlay-width", "Overlay Width",
"width of overlay image in pixels (0 = same as overlay image)",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_HEIGHT,
g_param_spec_int ("overlay-height", "Overlay Height",
"height of overlay image in pixels (0 = same as overlay image)",
0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (gdkpixbufoverlay_debug, "gdkpixbufoverlay", 0,
"debug category for gdkpixbufoverlay element");
@ -137,7 +183,14 @@ static void
gst_gdk_pixbuf_overlay_init (GstGdkPixbufOverlay * overlay,
GstGdkPixbufOverlayClass * overlay_class)
{
/* nothing to do here for now */
overlay->offset_x = 0;
overlay->offset_y = 0;
overlay->relative_x = 0.0;
overlay->relative_y = 0.0;
overlay->overlay_width = 0;
overlay->overlay_height = 0;
}
void
@ -146,15 +199,43 @@ gst_gdk_pixbuf_overlay_set_property (GObject * object, guint property_id,
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object);
GST_OBJECT_LOCK (overlay);
switch (property_id) {
case PROP_LOCATION:
g_free (overlay->location);
overlay->location = g_value_dup_string (value);
break;
case PROP_OFFSET_X:
overlay->offset_x = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_OFFSET_Y:
overlay->offset_y = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_RELATIVE_X:
overlay->relative_x = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_RELATIVE_Y:
overlay->relative_y = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_OVERLAY_WIDTH:
overlay->overlay_width = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
case PROP_OVERLAY_HEIGHT:
overlay->overlay_height = g_value_get_int (value);
overlay->update_composition = TRUE;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (overlay);
}
void
@ -163,14 +244,36 @@ gst_gdk_pixbuf_overlay_get_property (GObject * object, guint property_id,
{
GstGdkPixbufOverlay *overlay = GST_GDK_PIXBUF_OVERLAY (object);
GST_OBJECT_LOCK (overlay);
switch (property_id) {
case PROP_LOCATION:
g_value_set_string (value, overlay->location);
break;
case PROP_OFFSET_X:
g_value_set_int (value, overlay->offset_x);
break;
case PROP_OFFSET_Y:
g_value_set_int (value, overlay->offset_y);
break;
case PROP_RELATIVE_X:
g_value_set_double (value, overlay->relative_x);
break;
case PROP_RELATIVE_Y:
g_value_set_double (value, overlay->relative_y);
break;
case PROP_OVERLAY_WIDTH:
g_value_set_int (value, overlay->overlay_width);
break;
case PROP_OVERLAY_HEIGHT:
g_value_set_int (value, overlay->overlay_height);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
GST_OBJECT_UNLOCK (overlay);
}
void
@ -319,12 +422,37 @@ gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay)
{
GstVideoOverlayComposition *comp;
GstVideoOverlayRectangle *rect;
gint x, y, width, height;
x = overlay->offset_x + (overlay->relative_x * overlay->pixels_width);
y = overlay->offset_y + (overlay->relative_y * overlay->pixels_height);
/* FIXME: this should work, but seems to crash */
if (x < 0)
x = 0;
if (y < 0)
y = 0;
width = overlay->overlay_width;
if (width == 0)
width = overlay->pixels_width;
height = overlay->overlay_height;
if (height == 0)
height = overlay->pixels_height;
GST_DEBUG_OBJECT (overlay, "overlay image dimensions: %d x %d",
overlay->pixels_width, overlay->pixels_height);
GST_DEBUG_OBJECT (overlay, "properties: x,y: %d,%d (%g%%,%g%%) - WxH: %dx%d",
overlay->offset_x, overlay->offset_y,
overlay->relative_x * 100.0, overlay->relative_y * 100.0,
overlay->overlay_height, overlay->overlay_width);
GST_DEBUG_OBJECT (overlay, "overlay rendered: %d x %d @ %d,%d (onto %d x %d)",
width, height, x, y, overlay->width, overlay->height);
/* FIXME: add properties for position and render width and height */
rect = gst_video_overlay_rectangle_new_argb (overlay->pixels,
overlay->pixels_width, overlay->pixels_height, overlay->pixels_stride,
0, 0, overlay->pixels_width, overlay->pixels_height,
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
x, y, width, height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
comp = gst_video_overlay_composition_new (rect);
gst_video_overlay_rectangle_unref (rect);
@ -341,11 +469,15 @@ gst_gdk_pixbuf_overlay_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
overlay = GST_GDK_PIXBUF_OVERLAY (trans);
GST_OBJECT_LOCK (overlay);
if (G_UNLIKELY (overlay->update_composition)) {
gst_gdk_pixbuf_overlay_update_composition (overlay);
overlay->update_composition = FALSE;
}
GST_OBJECT_UNLOCK (overlay);
gst_video_overlay_composition_blend (overlay->comp, buf);
return GST_FLOW_OK;

12
ext/gdk_pixbuf/gstgdkpixbufoverlay.h
View file

@ -41,12 +41,24 @@ struct _GstGdkPixbufOverlay
{
GstVideoFilter videofilter;
/* negotiated format */
GstVideoFormat format;
gint width;
gint height;
/* properties */
gchar * location;
gint offset_x;
gint offset_y;
gdouble relative_x;
gdouble relative_y;
gint overlay_width;
gint overlay_height;
/* the loaded image */
GstBuffer * pixels;
guint pixels_width;
guint pixels_height;