GDK Reference Manual
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Color Contexts

Name

Color Contexts -- routines for allocating colors (deprecated).

Synopsis


#include <gdk/gdk.h>


struct      GdkColorContext;
struct      GdkColorContextDither;
enum        GdkColorContextMode;
GdkColorContext* gdk_color_context_new      (GdkVisual *visual,
                                             GdkColormap *colormap);
GdkColorContext* gdk_color_context_new_mono (GdkVisual *visual,
                                             GdkColormap *colormap);
void        gdk_color_context_free          (GdkColorContext *cc);
gulong      gdk_color_context_get_pixel     (GdkColorContext *cc,
                                             gushort red,
                                             gushort green,
                                             gushort blue,
                                             gint *failed);
void        gdk_color_context_get_pixels    (GdkColorContext *cc,
                                             gushort *reds,
                                             gushort *greens,
                                             gushort *blues,
                                             gint ncolors,
                                             gulong *colors,
                                             gint *nallocated);
void        gdk_color_context_get_pixels_incremental
                                            (GdkColorContext *cc,
                                             gushort *reds,
                                             gushort *greens,
                                             gushort *blues,
                                             gint ncolors,
                                             gint *used,
                                             gulong *colors,
                                             gint *nallocated);
gint        gdk_color_context_query_color   (GdkColorContext *cc,
                                             GdkColor *color);
gint        gdk_color_context_query_colors  (GdkColorContext *cc,
                                             GdkColor *colors,
                                             gint num_colors);
gint        gdk_color_context_add_palette   (GdkColorContext *cc,
                                             GdkColor *palette,
                                             gint num_palette);
void        gdk_color_context_init_dither   (GdkColorContext *cc);
void        gdk_color_context_free_dither   (GdkColorContext *cc);
gulong      gdk_color_context_get_pixel_from_palette
                                            (GdkColorContext *cc,
                                             gushort *red,
                                             gushort *green,
                                             gushort *blue,
                                             gint *failed);
guchar      gdk_color_context_get_index_from_palette
                                            (GdkColorContext *cc,
                                             gint *red,
                                             gint *green,
                                             gint *blue,
                                             gint *failed);

Description

The GdkColorContext type is used for allocating groups of colors.

It is now deprecated in favor of the gdk_colormap_*() functions described in the Colormaps and Colors section.

Details

struct GdkColorContext

struct GdkColorContext
{
  GdkVisual *visual;
  GdkColormap *colormap;

  gint num_colors;		/* available no. of colors in colormap */
  gint max_colors;		/* maximum no. of colors */
  gint num_allocated;		/* no. of allocated colors */

  GdkColorContextMode mode;
  gint need_to_free_colormap;
  GdkAtom std_cmap_atom;

  gulong *clut;			/* color look-up table */
  GdkColor *cmap;		/* colormap */

  GHashTable *color_hash;	/* hash table of allocated colors */
  GdkColor *palette;		/* preallocated palette */
  gint num_palette;		/* size of palette */

  GdkColorContextDither *fast_dither;	/* fast dither matrix */

  struct
  {
    gint red;
    gint green;
    gint blue;
  } shifts;

struct GdkColorContextDither

struct GdkColorContextDither
{
  gint fast_rgb[32][32][32]; /* quick look-up table for faster rendering */
  gint fast_err[32][32][32]; /* internal RGB error information */
  gint fast_erg[32][32][32];
  gint fast_erb[32][32][32];
};

enum GdkColorContextMode

typedef enum
{
  GDK_CC_MODE_UNDEFINED,
  GDK_CC_MODE_BW,
  GDK_CC_MODE_STD_CMAP,
  GDK_CC_MODE_TRUE,
  GDK_CC_MODE_MY_GRAY,
  GDK_CC_MODE_PALETTE
} GdkColorContextMode;

gdk_color_context_new ()

GdkColorContext* gdk_color_context_new      (GdkVisual *visual,
                                             GdkColormap *colormap);

visual : 
colormap : 
Returns : 

gdk_color_context_new_mono ()

GdkColorContext* gdk_color_context_new_mono (GdkVisual *visual,
                                             GdkColormap *colormap);

visual : 
colormap : 
Returns : 

gdk_color_context_free ()

void        gdk_color_context_free          (GdkColorContext *cc);

cc : 

gdk_color_context_get_pixel ()

gulong      gdk_color_context_get_pixel     (GdkColorContext *cc,
                                             gushort red,
                                             gushort green,
                                             gushort blue,
                                             gint *failed);

cc : 
red : 
green : 
blue : 
failed : 
Returns : 

gdk_color_context_get_pixels ()

void        gdk_color_context_get_pixels    (GdkColorContext *cc,
                                             gushort *reds,
                                             gushort *greens,
                                             gushort *blues,
                                             gint ncolors,
                                             gulong *colors,
                                             gint *nallocated);

cc : 
reds : 
greens : 
blues : 
ncolors : 
colors : 
nallocated : 

gdk_color_context_get_pixels_incremental ()

void        gdk_color_context_get_pixels_incremental
                                            (GdkColorContext *cc,
                                             gushort *reds,
                                             gushort *greens,
                                             gushort *blues,
                                             gint ncolors,
                                             gint *used,
                                             gulong *colors,
                                             gint *nallocated);

cc : 
reds : 
greens : 
blues : 
ncolors : 
used : 
colors : 
nallocated : 

gdk_color_context_query_color ()

gint        gdk_color_context_query_color   (GdkColorContext *cc,
                                             GdkColor *color);

cc : 
color : 
Returns : 

gdk_color_context_query_colors ()

gint        gdk_color_context_query_colors  (GdkColorContext *cc,
                                             GdkColor *colors,
                                             gint num_colors);

cc : 
colors : 
num_colors : 
Returns : 

gdk_color_context_add_palette ()

gint        gdk_color_context_add_palette   (GdkColorContext *cc,
                                             GdkColor *palette,
                                             gint num_palette);

cc : 
palette : 
num_palette : 
Returns : 

gdk_color_context_init_dither ()

void        gdk_color_context_init_dither   (GdkColorContext *cc);

cc : 

gdk_color_context_free_dither ()

void        gdk_color_context_free_dither   (GdkColorContext *cc);

cc : 

gdk_color_context_get_pixel_from_palette ()

gulong      gdk_color_context_get_pixel_from_palette
                                            (GdkColorContext *cc,
                                             gushort *red,
                                             gushort *green,
                                             gushort *blue,
                                             gint *failed);

cc : 
red : 
green : 
blue : 
failed : 
Returns : 

gdk_color_context_get_index_from_palette ()

guchar      gdk_color_context_get_index_from_palette
                                            (GdkColorContext *cc,
                                             gint *red,
                                             gint *green,
                                             gint *blue,
                                             gint *failed);

cc : 
red : 
green : 
blue : 
failed : 
Returns : 



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