gtk2/gdk/gdkcc.h

#ifndef __GDK_CC_H__
#define __GDK_CC_H__

#include <gdk/gdktypes.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef struct _GdkColorContextDither GdkColorContextDither;
typedef struct _GdkColorContext GdkColorContext;


/* Color Context modes.
 *
 * GDK_CC_MODE_UNDEFINED - unknown
 * GDK_CC_MODE_BW	 - default B/W
 * GDK_CC_MODE_STD_CMAP	 - has a standard colormap
 * GDK_CC_MODE_TRUE	 - is a TrueColor/DirectColor visual
 * GDK_CC_MODE_MY_GRAY	 - my grayramp
 * GDK_CC_MODE_PALETTE	 - has a pre-allocated palette
 */ 

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;

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];
};

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
  {
    gulong red;
    gulong green;
    gulong blue;
  } masks;

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

  gulong max_entry;

  gulong black_pixel;
  gulong white_pixel;
};

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);


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __GDK_CC_H__ */