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gdkpixbufoverlay: add a positioning coefficient pair

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... so as to allow one clearly defined (absolute) positioning mode
that can cater for a variety of absolute but also relative positioning
with respect to edge or center.
This commit is contained in:
Mark Nauwelaerts 2017-01-09 21:04:51 +01:00
parent 387da78da3
commit 24b2422bf3
2 changed files with 73 additions and 5 deletions
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75
ext/gdk_pixbuf/gstgdkpixbufoverlay.c
View file

@ -86,6 +86,8 @@ enum
PROP_OFFSET_Y,
PROP_RELATIVE_X,
PROP_RELATIVE_Y,
PROP_COEF_X,
PROP_COEF_Y,
PROP_OVERLAY_WIDTH,
PROP_OVERLAY_HEIGHT,
PROP_ALPHA
@ -185,13 +187,15 @@ gst_gdk_pixbuf_overlay_class_init (GstGdkPixbufOverlayClass * klass)
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,
"width, from top-left corner of video image"
" (in relative positioning)", -1.0, 1.0, 0.0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | 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,
"height, from top-left corner of video image"
" (in relative positioning)", -1.0, 1.0, 0.0,
GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE
| G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH,
@ -240,6 +244,45 @@ gst_gdk_pixbuf_overlay_class_init (GstGdkPixbufOverlayClass * klass)
GST_TYPE_GDK_PIXBUF_POSITIONING_MODE, DEFAULT_POSITIONING_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* FIXME the following actually act as a RELATIVE_X/RELATIVE_Y,
* but those were already slightly mutated/abused with ABSOLUTE positioning,
* so let's keep that and follow suit
* Suffice it to say all that could do with cleanup (2.0 ??) */
/**
* GstGdkPixbufOverlay:coef-x:
*
* In absolute positioning mode, the x coordinate of overlay image's
* top-left corner is now given by
* offset-x + (relative-x * overlay_width) + (coef-x * video_width).
* This allows to align the image absolutely and relatively
* to any edge or center position.
*
* Since: 1.12
*/
g_object_class_install_property (gobject_class, PROP_COEF_X,
g_param_spec_double ("coef-x", "Relative X Offset",
"Horizontal offset of overlay image in fractions of video image "
"width, from top-left corner of video image (absolute positioning)",
-1.0, 1.0, 0.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstGdkPixbufOverlay:coef-y:
*
* In absolute positioning mode, the y coordinate of overlay image's
* top-left corner is now given by
* offset-y + (relative-y * overlay_height) + (coef-y * video_height).
* This allows to align the image absolutely and relatively
* to any edge or center position.
*
* Since: 1.12
*/
g_object_class_install_property (gobject_class, PROP_COEF_Y,
g_param_spec_double ("coef-y", "Relative Y Offset",
"Vertical offset of overlay image in fractions of video image "
"height, from top-left corner of video image (absolute positioning)",
-1.0, 1.0, 0.0, GST_PARAM_CONTROLLABLE | GST_PARAM_MUTABLE_PLAYING
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &src_template);
@ -260,6 +303,9 @@ gst_gdk_pixbuf_overlay_init (GstGdkPixbufOverlay * overlay)
overlay->relative_x = 0.0;
overlay->relative_y = 0.0;
overlay->coef_x = 0.0;
overlay->coef_y = 0.0;
overlay->positioning_mode = DEFAULT_POSITIONING_MODE;
overlay->overlay_width = 0;
@ -320,6 +366,14 @@ gst_gdk_pixbuf_overlay_set_property (GObject * object, guint property_id,
overlay->relative_y = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_COEF_X:
overlay->coef_x = g_value_get_double (value);
overlay->update_composition = TRUE;
break;
case PROP_COEF_Y:
overlay->coef_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;
@ -371,6 +425,12 @@ gst_gdk_pixbuf_overlay_get_property (GObject * object, guint property_id,
case PROP_RELATIVE_Y:
g_value_set_double (value, overlay->relative_y);
break;
case PROP_COEF_X:
g_value_set_double (value, overlay->coef_x);
break;
case PROP_COEF_Y:
g_value_set_double (value, overlay->coef_y);
break;
case PROP_OVERLAY_WIDTH:
g_value_set_int (value, overlay->overlay_width);
break;
@ -561,6 +621,7 @@ gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay)
overlay_meta = gst_buffer_get_video_meta (overlay->pixels);
positioning_mode = overlay->positioning_mode;
GST_DEBUG_OBJECT (overlay, "overlay positioning mode %d", positioning_mode);
width = overlay->overlay_width;
if (width == 0)
@ -571,8 +632,10 @@ gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay)
height = overlay_meta->height;
if (positioning_mode == GST_GDK_PIXBUF_POSITIONING_PIXELS_ABSOLUTE) {
x = overlay->offset_x + (overlay->relative_x * width);
y = overlay->offset_y + (overlay->relative_y * height);
x = overlay->offset_x + (overlay->relative_x * width) +
(overlay->coef_x * video_width);
y = overlay->offset_y + (overlay->relative_y * height) +
(overlay->coef_y * video_height);
} else {
x = overlay->offset_x < 0 ?
video_width + overlay->offset_x - width +
@ -586,9 +649,11 @@ gst_gdk_pixbuf_overlay_update_composition (GstGdkPixbufOverlay * overlay)
GST_DEBUG_OBJECT (overlay, "overlay image dimensions: %d x %d, alpha=%.2f",
overlay_meta->width, overlay_meta->height, overlay->alpha);
GST_DEBUG_OBJECT (overlay, "properties: x,y: %d,%d (%g%%,%g%%) - WxH: %dx%d",
GST_DEBUG_OBJECT (overlay, "properties: x,y: %d,%d "
"(%g%%,%g%%) coef (%g%%,%g%%) - WxH: %dx%d",
overlay->offset_x, overlay->offset_y,
overlay->relative_x * 100.0, overlay->relative_y * 100.0,
overlay->coef_x * 100.0, overlay->coef_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, video_width, video_height);

3
ext/gdk_pixbuf/gstgdkpixbufoverlay.h
View file

@ -63,6 +63,9 @@ struct _GstGdkPixbufOverlay
gdouble relative_x;
gdouble relative_y;
gdouble coef_x;
gdouble coef_y;
GstGdkPixbufPositioningMode positioning_mode;
gint overlay_width;