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178 lines
7.0 KiB
C
178 lines
7.0 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
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#error "Only <gdk/gdk.h> can be included directly."
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#endif
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#ifndef __GDK_VISUAL_H__
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#define __GDK_VISUAL_H__
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#include <gdk/gdktypes.h>
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G_BEGIN_DECLS
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#define GDK_TYPE_VISUAL (gdk_visual_get_type ())
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#define GDK_VISUAL(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_VISUAL, GdkVisual))
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#define GDK_VISUAL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_VISUAL, GdkVisualClass))
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#define GDK_IS_VISUAL(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_VISUAL))
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#define GDK_IS_VISUAL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_VISUAL))
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#define GDK_VISUAL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_VISUAL, GdkVisualClass))
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typedef struct _GdkVisualPrivate GdkVisualPrivate;
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typedef struct _GdkVisualClass GdkVisualClass;
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/**
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* GdkVisualType:
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* @GDK_VISUAL_STATIC_GRAY: Each pixel value indexes a grayscale value
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* directly.
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* @GDK_VISUAL_GRAYSCALE: Each pixel is an index into a color map that
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* maps pixel values into grayscale values. The color map can be
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* changed by an application.
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* @GDK_VISUAL_STATIC_COLOR: Each pixel value is an index into a predefined,
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* unmodifiable color map that maps pixel values into RGB values.
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* @GDK_VISUAL_PSEUDO_COLOR: Each pixel is an index into a color map that
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* maps pixel values into rgb values. The color map can be changed by
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* an application.
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* @GDK_VISUAL_TRUE_COLOR: Each pixel value directly contains red, green,
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* and blue components. Use gdk_visual_get_red_pixel_details(), etc,
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* to obtain information about how the components are assembled into
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* a pixel value.
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* @GDK_VISUAL_DIRECT_COLOR: Each pixel value contains red, green, and blue
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* components as for %GDK_VISUAL_TRUE_COLOR, but the components are
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* mapped via a color table into the final output table instead of
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* being converted directly.
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*
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* A set of values that describe the manner in which the pixel values
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* for a visual are converted into RGB values for display.
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*/
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typedef enum
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{
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GDK_VISUAL_STATIC_GRAY,
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GDK_VISUAL_GRAYSCALE,
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GDK_VISUAL_STATIC_COLOR,
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GDK_VISUAL_PSEUDO_COLOR,
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GDK_VISUAL_TRUE_COLOR,
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GDK_VISUAL_DIRECT_COLOR
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} GdkVisualType;
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/**
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* GdkVisual:
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*
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* The #GdkVisual structure contains information about
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* a particular visual.
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*
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* <example id="rgbmask">
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* <title>Constructing a pixel value from components</title>
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* <programlisting>
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* guint
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* pixel_from_rgb (GdkVisual *visual,
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* guchar r, guchar b, guchar g)
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* {
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* return ((r >> (16 - visual->red_prec)) << visual->red_shift) |
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* ((g >> (16 - visual->green_prec)) << visual->green_shift) |
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* ((r >> (16 - visual->blue_prec)) << visual->blue_shift);
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* }
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* </programlisting>
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* </example>
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*/
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struct _GdkVisual
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{
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/*< private >*/
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GObject parent_instance;
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GdkVisualType GSEAL (type); /* Type of visual this is (PseudoColor, TrueColor, etc) */
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gint GSEAL (depth); /* Bit depth of this visual */
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GdkByteOrder GSEAL (byte_order);
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gint GSEAL (colormap_size); /* Size of a colormap for this visual */
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gint GSEAL (bits_per_rgb); /* Number of significant bits per red, green and blue. */
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/* The red, green and blue masks, shifts and precisions refer
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* to value needed to calculate pixel values in TrueColor and DirectColor
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* visuals. The "mask" is the significant bits within the pixel. The
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* "shift" is the number of bits left we must shift a primary for it
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* to be in position (according to the "mask"). "prec" refers to how
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* much precision the pixel value contains for a particular primary.
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*/
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guint32 GSEAL (red_mask);
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gint GSEAL (red_shift);
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gint GSEAL (red_prec);
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guint32 GSEAL (green_mask);
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gint GSEAL (green_shift);
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gint GSEAL (green_prec);
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guint32 GSEAL (blue_mask);
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gint GSEAL (blue_shift);
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gint GSEAL (blue_prec);
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GdkVisualPrivate *priv;
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};
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GType gdk_visual_get_type (void) G_GNUC_CONST;
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#ifndef GDK_MULTIHEAD_SAFE
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gint gdk_visual_get_best_depth (void);
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GdkVisualType gdk_visual_get_best_type (void);
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GdkVisual* gdk_visual_get_system (void);
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GdkVisual* gdk_visual_get_best (void);
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GdkVisual* gdk_visual_get_best_with_depth (gint depth);
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GdkVisual* gdk_visual_get_best_with_type (GdkVisualType visual_type);
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GdkVisual* gdk_visual_get_best_with_both (gint depth,
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GdkVisualType visual_type);
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void gdk_query_depths (gint **depths,
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gint *count);
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void gdk_query_visual_types (GdkVisualType **visual_types,
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gint *count);
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GList* gdk_list_visuals (void);
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#endif
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GdkScreen *gdk_visual_get_screen (GdkVisual *visual);
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GdkVisualType gdk_visual_get_visual_type (GdkVisual *visual);
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gint gdk_visual_get_depth (GdkVisual *visual);
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GdkByteOrder gdk_visual_get_byte_order (GdkVisual *visual);
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gint gdk_visual_get_colormap_size (GdkVisual *visual);
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gint gdk_visual_get_bits_per_rgb (GdkVisual *visual);
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void gdk_visual_get_red_pixel_details (GdkVisual *visual,
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guint32 *mask,
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gint *shift,
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gint *precision);
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void gdk_visual_get_green_pixel_details (GdkVisual *visual,
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guint32 *mask,
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gint *shift,
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gint *precision);
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void gdk_visual_get_blue_pixel_details (GdkVisual *visual,
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guint32 *mask,
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gint *shift,
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gint *precision);
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G_END_DECLS
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#endif /* __GDK_VISUAL_H__ */
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