Struct

CoglColor

Description [src]

struct CoglColor {
  uint8_t red;
  uint8_t green;
  uint8_t blue;
  uint8_t alpha;
}

A generic color definition

CoglColor is a simple structure holding the definition of a color such that it can be efficiently used by GL.

Structure members

red: No description available.
green: No description available.
blue: No description available.
alpha: No description available.

Functions

cogl_color_equal

Compares two CoglColors and checks if they are the same.

cogl_color_from_string

Parses a string definition of a color, filling the CoglColor.red, CoglColor.green, CoglColor.blue and CoglColor.alpha fields of color.

cogl_color_init_from_hsl

Converts a color expressed in HLS (hue, luminance and saturation) values into a CoglColor.

Instance methods

cogl_color_free

Frees the resources allocated by cogl_color_new() and cogl_color_copy().

cogl_color_get_alpha

Retrieves the alpha channel of color as a fixed point value between 0 and 1.0.

cogl_color_get_blue

Retrieves the blue channel of color as a fixed point value between 0 and 1.0.

cogl_color_get_green

Retrieves the green channel of color as a fixed point value between 0 and 1.0.

cogl_color_get_red

Retrieves the red channel of color as a fixed point value between 0 and 1.0.

cogl_color_init_from_4f

Sets the values of the passed channels into a CoglColor.

cogl_color_premultiply

Converts a non-premultiplied color to a pre-multiplied color. For example, semi-transparent red is (1.0, 0, 0, 0.5) when non-premultiplied and (0.5, 0, 0, 0.5) when premultiplied.

Returns a textual specification of color in the hexadecimal form &num;rrggbbaa, where r, g, b and a are hexadecimal digits representing the red, green, blue and alpha components respectively.