GDK Reference Manual

来源：Linux-cn.com 作者：Webmaster 时间：2007-05-05 点击： [收藏] [投稿]


gdk_color_change ()
gbooleangdk_color_change(GdkColormap *colormap,GdkColor *color);

　　Change the value of a color that has already been allocated. If colormap is not a private colormap, then the color must have been allocated using gdk_colormap_alloc_colors() with the writeable set to TRUE.

　　colormap : a GdkColormap.

　　color : a GdkColor, with the color to change in the pixel field, and the new value in the remaining fields.

　　Returns :


gdk_color_equal ()
gintgdk_color_equal (const GdkColor *colora,const GdkColor *colorb);

　　Compare two colors.

　　colora : a GdkColor.

　　colorb : another GdkColor.

　　Returns : TRUE if the two colors compare equal


gdk_color_hash ()
guint gdk_color_hash(const GdkColor *colora,const GdkColor *colorb);

　　A hash function suitable for using for a hash table that stores GdkColor's.

　　colora : a GdkColor.

　　colorb : NOT USED.

　　Returns : The hash function appled to colora

　　Color Contexts

　　Name

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

　　Synopsis


#include <gdk/gdk.h>
structGdkColorContext;
structGdkColorContextDither;
enumGdkColorContextMode;
GdkColorContext* gdk_color_context_new(GdkVisual *visual,
GdkColormap *colormap);
GdkColorContext* gdk_color_context_new_mono (GdkVisual *visual,
GdkColormap *colormap);
voidgdk_color_context_free(GdkColorContext *cc);
gulonggdk_color_context_get_pixel (GdkColorContext *cc,
gushort red,gushort green,gushort blue,gint *failed);
voidgdk_color_context_get_pixels(GdkColorContext *cc,
gushort *reds,gushort *greens,gushort *blues,
gint ncolors,gulong *colors,gint *nallocated);
voidgdk_color_context_get_pixels_incremental
(GdkColorContext *cc,gushort *reds,gushort *greens,gushort *blues,
gint ncolors,gint *used,gulong *colors,gint *nallocated);
gintgdk_color_context_query_color (GdkColorContext *cc,GdkColor *color);
gintgdk_color_context_query_colors(GdkColorContext *cc,
GdkColor *colors,gint num_colors);
gintgdk_color_context_add_palette (GdkColorContext *cc,
GdkColor *palette,gint num_palette);
voidgdk_color_context_init_dither (GdkColorContext *cc);
voidgdk_color_context_free_dither (GdkColorContext *cc);
gulonggdk_color_context_get_pixel_from_palette
(GdkColorContext *cc,gushort *red,
gushort *green,gushort *blue,gint *failed);
guchargdk_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 :

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