gtk2/gdk/gdkvisual.h

#ifndef __GDK_VISUAL_H__
#define __GDK_VISUAL_H__

#include <gdk/gdktypes.h>

G_BEGIN_DECLS

#define GDK_TYPE_VISUAL              (gdk_visual_get_type ())
#define GDK_VISUAL(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_VISUAL, GdkVisual))
#define GDK_VISUAL_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_VISUAL, GdkVisualClass))
#define GDK_IS_VISUAL(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_VISUAL))
#define GDK_IS_VISUAL_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_VISUAL))
#define GDK_VISUAL_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_VISUAL, GdkVisualClass))

typedef struct _GdkVisualClass    GdkVisualClass;

/* Types of visuals.
 *   StaticGray:
 *   Grayscale:
 *   StaticColor:
 *   PseudoColor:
 *   TrueColor:
 *   DirectColor:
 */
typedef enum
{
  GDK_VISUAL_STATIC_GRAY,
  GDK_VISUAL_GRAYSCALE,
  GDK_VISUAL_STATIC_COLOR,
  GDK_VISUAL_PSEUDO_COLOR,
  GDK_VISUAL_TRUE_COLOR,
  GDK_VISUAL_DIRECT_COLOR
} GdkVisualType;

/* The visual type.
 *   "type" is the type of visual this is (PseudoColor, TrueColor, etc).
 *   "depth" is the bit depth of this visual.
 *   "colormap_size" is the size of a colormap for this visual.
 *   "bits_per_rgb" is the number of significant bits per red, green and blue.
 *  The red, green and blue masks, shifts and precisions refer
 *   to value needed to calculate pixel values in TrueColor and DirectColor
 *   visuals. The "mask" is the significant bits within the pixel. The
 *   "shift" is the number of bits left we must shift a primary for it
 *   to be in position (according to the "mask"). "prec" refers to how
 *   much precision the pixel value contains for a particular primary.
 */
struct _GdkVisual
{
  GObject parent_instance;
  
  GdkVisualType type;
  gint depth;
  GdkByteOrder byte_order;
  gint colormap_size;
  gint bits_per_rgb;

  guint32 red_mask;
  gint red_shift;
  gint red_prec;

  guint32 green_mask;
  gint green_shift;
  gint green_prec;

  guint32 blue_mask;
  gint blue_shift;
  gint blue_prec;
};

GType         gdk_visual_get_type            (void) G_GNUC_CONST;

#ifndef GDK_MULTIHEAD_SAFE
gint	      gdk_visual_get_best_depth	     (void);
GdkVisualType gdk_visual_get_best_type	     (void);
GdkVisual*    gdk_visual_get_system	     (void);
GdkVisual*    gdk_visual_get_best	     (void);
GdkVisual*    gdk_visual_get_best_with_depth (gint	     depth);
GdkVisual*    gdk_visual_get_best_with_type  (GdkVisualType  visual_type);
GdkVisual*    gdk_visual_get_best_with_both  (gint	     depth,
					      GdkVisualType  visual_type);

void gdk_query_depths	    (gint	    **depths,
			     gint	     *count);
void gdk_query_visual_types (GdkVisualType  **visual_types,
			     gint	     *count);

GList* gdk_list_visuals (void);
#endif

GdkScreen *gdk_visual_get_screen (GdkVisual *visual);

#ifndef GDK_DISABLE_DEPRECATED
#define gdk_visual_ref(v) g_object_ref(v)
#define gdk_visual_unref(v) g_object_unref(v)
#endif

G_END_DECLS

#endif /* __GDK_VISUAL_H__ */