Description
GdkRGBA is a convenient way to pass rgba colors around.
It’s based on cairo’s way to deal with colors and mirrors its behavior.
All values are in the range from 0.0 to 1.0 inclusive. So the color
(0.0, 0.0, 0.0, 0.0) represents transparent black and
(1.0, 1.0, 1.0, 1.0) is opaque white. Other values will be clamped
to this range when drawing.
Functions
gdk_rgba_parse ()
gboolean
gdk_rgba_parse (GdkRGBA *rgba,
const gchar *spec);
Parses a textual representation of a color, filling in
the red
, green
, blue
and alpha
fields of the rgba
GdkRGBA.
The string can be either one of:
A standard name (Taken from the X11 rgb.txt file).
A hexadecimal value in the form “#rgb”, “#rrggbb”,
“#rrrgggbbb” or ”#rrrrggggbbbb”
A RGB color in the form “rgb(r,g,b)” (In this case the color will
have full opacity)
A RGBA color in the form “rgba(r,g,b,a)”
Where “r”, “g”, “b” and “a” are respectively the red, green, blue and
alpha color values. In the last two cases, “r”, “g”, and “b” are either integers
in the range 0 to 255 or percentage values in the range 0% to 100%, and
a is a floating point value in the range 0 to 1.
Returns
TRUE if the parsing succeeded
Since: 3.0
gdk_rgba_hash ()
guint
gdk_rgba_hash (gconstpointer p);
A hash function suitable for using for a hash
table that stores GdkRGBAs.
Returns
The hash value for p
Since: 3.0
gdk_rgba_to_string ()
gchar *
gdk_rgba_to_string (const GdkRGBA *rgba);
Returns a textual specification of rgba
in the form
rgb(r,g,b) or
rgba(r g,b,a),
where “r”, “g”, “b” and “a” represent the red, green,
blue and alpha values respectively. “r”, “g”, and “b” are
represented as integers in the range 0 to 255, and “a”
is represented as a floating point value in the range 0 to 1.
These string forms are string forms that are supported by
the CSS3 colors module, and can be parsed by gdk_rgba_parse().
Note that this string representation may lose some
precision, since “r”, “g” and “b” are represented as 8-bit
integers. If this is a concern, you should use a
different representation.
Returns
A newly allocated text string
Since: 3.0