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basetextoverlay: Add new properties and alignment type for unclamped absolute positions

Browse source 
Introduces [x-absolute, y-absolute] properties
for positioning in +/- MAX_DOUBLE range.

Adds new (h/v)alignment type "absolute" where coordinates
map the text area to be exactly inside of video canvas for [0, 0] - [1, 1]:

[0, 0]: Top-Lefts of video and text are aligned
[0.5, 0.5]: Centers are aligned
[1, 1]: Bottom-Rights are aligned

https://bugzilla.gnome.org/show_bug.cgi?id=761251
This commit is contained in:
Lubosz Sarnecki 2016-03-08 19:22:34 +01:00 committed by Tim-Philipp Müller
parent 241fcaa645
commit 8a443784c4
2 changed files with 68 additions and 6 deletions
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68
ext/pango/gstbasetextoverlay.c
View file

@ -90,6 +90,8 @@ enum
PROP_DELTAY,
PROP_XPOS,
PROP_YPOS,
PROP_X_ABSOLUTE,
PROP_Y_ABSOLUTE,
PROP_WRAP_MODE,
PROP_FONT_DESC,
PROP_SILENT,
@ -141,8 +143,10 @@ gst_base_text_overlay_valign_get_type (void)
{GST_BASE_TEXT_OVERLAY_VALIGN_BASELINE, "baseline", "baseline"},
{GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM, "bottom", "bottom"},
{GST_BASE_TEXT_OVERLAY_VALIGN_TOP, "top", "top"},
{GST_BASE_TEXT_OVERLAY_VALIGN_POS, "position", "position"},
{GST_BASE_TEXT_OVERLAY_VALIGN_POS, "position",
"Absolute position clamped to canvas"},
{GST_BASE_TEXT_OVERLAY_VALIGN_CENTER, "center", "center"},
{GST_BASE_TEXT_OVERLAY_VALIGN_ABSOLUTE, "absolute", "Absolute position"},
{0, NULL, NULL},
};
@ -163,7 +167,9 @@ gst_base_text_overlay_halign_get_type (void)
{GST_BASE_TEXT_OVERLAY_HALIGN_LEFT, "left", "left"},
{GST_BASE_TEXT_OVERLAY_HALIGN_CENTER, "center", "center"},
{GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT, "right", "right"},
{GST_BASE_TEXT_OVERLAY_HALIGN_POS, "position", "position"},
{GST_BASE_TEXT_OVERLAY_HALIGN_POS, "position",
"Absolute position clamped to canvas"},
{GST_BASE_TEXT_OVERLAY_HALIGN_ABSOLUTE, "absolute", "Absolute position"},
{0, NULL, NULL},
};
@ -445,7 +451,7 @@ gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_XPOS,
g_param_spec_double ("xpos", "horizontal position",
"Horizontal position when using position alignment", 0, 1.0,
"Horizontal position when using clamped position alignment", 0, 1.0,
DEFAULT_PROP_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
@ -455,9 +461,45 @@ gst_base_text_overlay_class_init (GstBaseTextOverlayClass * klass)
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_YPOS,
g_param_spec_double ("ypos", "vertical position",
"Vertical position when using position alignment", 0, 1.0,
"Vertical position when using clamped position alignment", 0, 1.0,
DEFAULT_PROP_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:x-absolute:
*
* Horizontal position of the rendered text when using absolute alignment.
*
* Maps the text area to be exactly inside of video canvas for [0, 0] - [1, 1]:
*
* [0, 0]: Top-Lefts of video and text are aligned
* [0.5, 0.5]: Centers are aligned
* [1, 1]: Bottom-Rights are aligned
*
* Values beyond [0, 0] - [1, 1] place the text outside of the video canvas.
*
* Since: 1.8
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X_ABSOLUTE,
g_param_spec_double ("x-absolute", "horizontal position",
"Horizontal position when using absolute alignment", -G_MAXDOUBLE,
G_MAXDOUBLE, DEFAULT_PROP_XPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseTextOverlay:y-absolute:
*
* See x-absolute.
*
* Vertical position of the rendered text when using absolute alignment.
*
* Since: 1.8
*/
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y_ABSOLUTE,
g_param_spec_double ("y-absolute", "vertical position",
"Vertical position when using absolute alignment", -G_MAXDOUBLE,
G_MAXDOUBLE, DEFAULT_PROP_YPOS,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WRAP_MODE,
g_param_spec_enum ("wrap-mode", "wrap mode",
"Whether to wrap the text and if so how.",
@ -978,6 +1020,12 @@ gst_base_text_overlay_set_property (GObject * object, guint prop_id,
case PROP_YPOS:
overlay->ypos = g_value_get_double (value);
break;
case PROP_X_ABSOLUTE:
overlay->xpos = g_value_get_double (value);
break;
case PROP_Y_ABSOLUTE:
overlay->ypos = g_value_get_double (value);
break;
case PROP_VALIGNMENT:
overlay->valign = g_value_get_enum (value);
break;
@ -1091,6 +1139,12 @@ gst_base_text_overlay_get_property (GObject * object, guint prop_id,
case PROP_YPOS:
g_value_set_double (value, overlay->ypos);
break;
case PROP_X_ABSOLUTE:
g_value_set_double (value, overlay->xpos);
break;
case PROP_Y_ABSOLUTE:
g_value_set_double (value, overlay->ypos);
break;
case PROP_VALIGNMENT:
g_value_set_enum (value, overlay->valign);
break;
@ -1496,6 +1550,9 @@ gst_base_text_overlay_get_pos (GstBaseTextOverlay * overlay,
if (*xpos < 0)
*xpos = 0;
break;
case GST_BASE_TEXT_OVERLAY_HALIGN_ABSOLUTE:
*xpos = (overlay->width - overlay->text_width) * overlay->xpos;
break;
default:
*xpos = 0;
}
@ -1521,6 +1578,9 @@ gst_base_text_overlay_get_pos (GstBaseTextOverlay * overlay,
*ypos = (gint) (overlay->height * overlay->ypos) - height / 2;
*ypos = CLAMP (*ypos, 0, overlay->height - overlay->ink_rect.height);
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_ABSOLUTE:
*ypos = (overlay->height - overlay->text_height) * overlay->ypos;
break;
case GST_BASE_TEXT_OVERLAY_VALIGN_CENTER:
*ypos = (overlay->height - height) / 2;
break;

6
ext/pango/gstbasetextoverlay.h
View file

@ -62,7 +62,8 @@ typedef enum {
GST_BASE_TEXT_OVERLAY_VALIGN_BOTTOM,
GST_BASE_TEXT_OVERLAY_VALIGN_TOP,
GST_BASE_TEXT_OVERLAY_VALIGN_POS,
GST_BASE_TEXT_OVERLAY_VALIGN_CENTER
GST_BASE_TEXT_OVERLAY_VALIGN_CENTER,
GST_BASE_TEXT_OVERLAY_VALIGN_ABSOLUTE
} GstBaseTextOverlayVAlign;
/**
@ -80,7 +81,8 @@ typedef enum {
GST_BASE_TEXT_OVERLAY_HALIGN_CENTER,
GST_BASE_TEXT_OVERLAY_HALIGN_RIGHT,
GST_BASE_TEXT_OVERLAY_HALIGN_UNUSED,
GST_BASE_TEXT_OVERLAY_HALIGN_POS
GST_BASE_TEXT_OVERLAY_HALIGN_POS,
GST_BASE_TEXT_OVERLAY_HALIGN_ABSOLUTE
} GstBaseTextOverlayHAlign;
/**