GimpCairoColor

GimpCairoColor — Color utility functions for cairo

Synopsis

void                gimp_cairo_set_source_rgb           (cairo_t *cr,
                                                         const GimpRGB *color);
void                gimp_cairo_set_source_rgba          (cairo_t *cr,
                                                         const GimpRGB *color);
cairo_pattern_t *   gimp_cairo_checkerboard_create      (cairo_t *cr,
                                                         gint size,
                                                         const GimpRGB *light,
                                                         const GimpRGB *dark);
#define             GIMP_CAIRO_RGB24_SET_PIXEL          (d,
                                                         r,
                                                         g,
                                                         b)
#define             GIMP_CAIRO_RGB24_GET_PIXEL          (s,
                                                         r,
                                                         g,
                                                         b)
#define             GIMP_CAIRO_ARGB32_SET_PIXEL         (d,
                                                         r,
                                                         g,
                                                         b,
                                                         a)
#define             GIMP_CAIRO_ARGB32_GET_PIXEL         (s,
                                                         r,
                                                         g,
                                                         b,
                                                         a)

Description

Utility functions that make cairo easier to use with GIMP color data types.

Details

gimp_cairo_set_source_rgb ()

void                gimp_cairo_set_source_rgb           (cairo_t *cr,
                                                         const GimpRGB *color);

Sets the source pattern within cr to the solid opaque color described by color.

This function calls cairo_set_source_rgb() for you.

cr :

Cairo context

color :

GimpRGB color

Since GIMP 2.6


gimp_cairo_set_source_rgba ()

void                gimp_cairo_set_source_rgba          (cairo_t *cr,
                                                         const GimpRGB *color);

Sets the source pattern within cr to the solid translucent color described by color.

This function calls cairo_set_source_rgba() for you.

cr :

Cairo context

color :

GimpRGB color

Since GIMP 2.6


gimp_cairo_checkerboard_create ()

cairo_pattern_t *   gimp_cairo_checkerboard_create      (cairo_t *cr,
                                                         gint size,
                                                         const GimpRGB *light,
                                                         const GimpRGB *dark);

Create a repeating checkerboard pattern.

cr :

Cairo context

size :

check size

light :

light check color or NULL to use the default light gray

dark :

dark check color or NULL to use the default dark gray

Returns :

a new Cairo pattern that can be used as a source on cr.

Since GIMP 2.6


GIMP_CAIRO_RGB24_SET_PIXEL()

#define             GIMP_CAIRO_RGB24_SET_PIXEL(d, r, g, b)

Sets a single pixel in an Cairo image surface in CAIRO_FORMAT_RGB24.

d :

pointer to the destination buffer

r :

red component

g :

green component

b :

blue component

Since GIMP 2.6


GIMP_CAIRO_RGB24_GET_PIXEL()

#define             GIMP_CAIRO_RGB24_GET_PIXEL(s, r, g, b)

Gets a single pixel from a Cairo image surface in CAIRO_FORMAT_RGB24.

s :

pointer to the source buffer

r :

red component

g :

green component

b :

blue component

Since GIMP 2.8


GIMP_CAIRO_ARGB32_SET_PIXEL()

#define             GIMP_CAIRO_ARGB32_SET_PIXEL(d, r, g, b, a)

Sets a single pixel in an Cairo image surface in CAIRO_FORMAT_ARGB32.

d :

pointer to the destination buffer

r :

red component, not pre-multiplied

g :

green component, not pre-multiplied

b :

blue component, not pre-multiplied

a :

alpha component

Since GIMP 2.6


GIMP_CAIRO_ARGB32_GET_PIXEL()

#define             GIMP_CAIRO_ARGB32_GET_PIXEL(s, r, g, b, a)

Gets a single pixel from a Cairo image surface in CAIRO_FORMAT_ARGB32.

s :

pointer to the source buffer

r :

red component, not pre-multiplied

g :

green component, not pre-multiplied

b :

blue component, not pre-multiplied

a :

alpha component

Since GIMP 2.8