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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Visuals: GDK 2 Reference Manual</title>
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top  | 
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                  Description
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Home
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Up
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Prev
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Next
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Visuals
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Visuals
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Functions
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void
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gdk_query_depths ()
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void
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gdk_query_visual_types ()
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GList *
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gdk_list_visuals ()
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gint
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gdk_visual_get_best_depth ()
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GdkVisualType
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gdk_visual_get_best_type ()
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GdkVisual *
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gdk_visual_get_system ()
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GdkVisual *
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gdk_visual_get_best ()
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GdkVisual *
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gdk_visual_get_best_with_depth ()
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GdkVisual *
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gdk_visual_get_best_with_type ()
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GdkVisual *
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gdk_visual_get_best_with_both ()
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#define
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gdk_visual_ref()
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#define
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gdk_visual_unref()
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GdkScreen *
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gdk_visual_get_screen ()
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gint
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gdk_visual_get_bits_per_rgb ()
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void
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gdk_visual_get_blue_pixel_details ()
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GdkByteOrder
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gdk_visual_get_byte_order ()
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gint
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gdk_visual_get_colormap_size ()
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gint
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gdk_visual_get_depth ()
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void
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gdk_visual_get_green_pixel_details ()
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void
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gdk_visual_get_red_pixel_details ()
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GdkVisualType
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gdk_visual_get_visual_type ()
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Types and Values
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GdkVisual
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enum
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GdkVisualType
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enum
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GdkByteOrder
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Includes
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#include <gdk/gdk.h>
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Description
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Functions
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gdk_query_depths ()
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void
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gdk_query_depths (gint **depths,
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                  gint *count);
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This function returns the available bit depths for the default
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screen. It's equivalent to listing the visuals
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(gdk_list_visuals()) and then looking at the depth field in each
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visual, removing duplicates.
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The array returned by this function should not be freed.
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Parameters
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depths
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return location for available depths.
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[out][array]
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count
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return location for number of available depths.
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[out]
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gdk_query_visual_types ()
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void
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gdk_query_visual_types (GdkVisualType **visual_types,
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                        gint *count);
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This function returns the available visual types for the default
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screen. It's equivalent to listing the visuals
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(gdk_list_visuals()) and then looking at the type field in each
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visual, removing duplicates.
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The array returned by this function should not be freed.
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Parameters
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visual_types
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return location for the available visual types
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count
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return location for the number of available visual types
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gdk_list_visuals ()
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GList *
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gdk_list_visuals (void);
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Lists the available visuals for the default screen.
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(See gdk_screen_list_visuals())
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A visual describes a hardware image data format.
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For example, a visual might support 24-bit color, or 8-bit color,
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and might expect pixels to be in a certain format.
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Call g_list_free() on the return value when you're finished with it.
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Returns
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a list of visuals; the list must be freed, but not its contents.
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[transfer container][element-type GdkVisual]
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gdk_visual_get_best_depth ()
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gint
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gdk_visual_get_best_depth (void);
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Get the best available depth for the default GDK screen.  "Best"
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means "largest," i.e. 32 preferred over 24 preferred over 8 bits
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per pixel.
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Returns
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 best available depth
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gdk_visual_get_best_type ()
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GdkVisualType
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gdk_visual_get_best_type (void);
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Return the best available visual type for the default GDK screen.
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Returns
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 best visual type
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gdk_visual_get_system ()
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GdkVisual *
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gdk_visual_get_system (void);
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Get the system's default visual for the default GDK screen.
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This is the visual for the root window of the display.
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The return value should not be freed.
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Returns
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system visual.
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[transfer none]
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gdk_visual_get_best ()
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GdkVisual *
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gdk_visual_get_best (void);
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Get the visual with the most available colors for the default
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GDK screen. The return value should not be freed.
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Returns
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best visual.
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[transfer none]
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gdk_visual_get_best_with_depth ()
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GdkVisual *
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gdk_visual_get_best_with_depth (gint depth);
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Get the best visual with depth depth
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 for the default GDK screen.
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Color visuals and visuals with mutable colormaps are preferred
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over grayscale or fixed-colormap visuals. The return value should not
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be freed. NULL may be returned if no visual supports depth
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.
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Parameters
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depth
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a bit depth
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Returns
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best visual for the given depth.
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[transfer none]
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gdk_visual_get_best_with_type ()
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GdkVisual *
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gdk_visual_get_best_with_type (GdkVisualType visual_type);
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Get the best visual of the given visual_type
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 for the default GDK screen.
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Visuals with higher color depths are considered better. The return value
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should not be freed. NULL may be returned if no visual has type
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visual_type
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.
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Parameters
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visual_type
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a visual type
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Returns
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best visual of the given type.
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[transfer none]
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gdk_visual_get_best_with_both ()
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GdkVisual *
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gdk_visual_get_best_with_both (gint depth,
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                               GdkVisualType visual_type);
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Combines gdk_visual_get_best_with_depth() and gdk_visual_get_best_with_type().
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Parameters
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depth
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a bit depth
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visual_type
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a visual type
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Returns
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best visual with both depth
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and
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visual_type
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, or NULL if none.
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[transfer none]
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gdk_visual_ref()
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#define gdk_visual_ref(v) g_object_ref(v)
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gdk_visual_ref is deprecated and should not be used in newly-written code.
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gdk_visual_unref()
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#define gdk_visual_unref(v) g_object_unref(v)
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gdk_visual_unref is deprecated and should not be used in newly-written code.
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gdk_visual_get_screen ()
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GdkScreen *
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gdk_visual_get_screen (GdkVisual *visual);
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Gets the screen to which this visual belongs
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Parameters
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visual
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a GdkVisual
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Returns
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the screen to which this visual belongs.
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[transfer none]
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Since: 2.2
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gdk_visual_get_bits_per_rgb ()
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gint
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gdk_visual_get_bits_per_rgb (GdkVisual *visual);
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Returns the number of significant bits per red, green and blue value.
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Parameters
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visual
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a GdkVisual
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Returns
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 The number of significant bits per color value for visual
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.
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Since: 2.22
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gdk_visual_get_blue_pixel_details ()
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void
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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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Obtains values that are needed to calculate blue pixel values in TrueColor
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and DirectColor.  The "mask" is the significant bits within the pixel.
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The "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").  Finally, "precision" refers
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to how much precision the pixel value contains for a particular primary.
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Parameters
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visual
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a GdkVisual
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mask
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A pointer to a guint32 to be filled in, or NULL.
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[out][allow-none]
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shift
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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precision
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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Since: 2.22
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gdk_visual_get_byte_order ()
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GdkByteOrder
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gdk_visual_get_byte_order (GdkVisual *visual);
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Returns the byte order of this visual.
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Parameters
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visual
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A GdkVisual.
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Returns
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 A GdkByteOrder stating the byte order of visual
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.
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Since: 2.22
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gdk_visual_get_colormap_size ()
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gint
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gdk_visual_get_colormap_size (GdkVisual *visual);
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Returns the size of a colormap for this visual.
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Parameters
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visual
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A GdkVisual.
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Returns
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 The size of a colormap that is suitable for visual
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.
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Since: 2.22
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gdk_visual_get_depth ()
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gint
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gdk_visual_get_depth (GdkVisual *visual);
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Returns the bit depth of this visual.
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Parameters
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visual
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A GdkVisual.
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Returns
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 The bit depth of this visual.
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Since: 2.22
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gdk_visual_get_green_pixel_details ()
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void
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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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Obtains values that are needed to calculate green pixel values in TrueColor
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and DirectColor.  The "mask" is the significant bits within the pixel.
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The "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").  Finally, "precision" refers
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to how much precision the pixel value contains for a particular primary.
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Parameters
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visual
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a GdkVisual
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mask
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A pointer to a guint32 to be filled in, or NULL.
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[out][allow-none]
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shift
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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precision
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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Since: 2.22
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gdk_visual_get_red_pixel_details ()
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void
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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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Obtains values that are needed to calculate red pixel values in TrueColor
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and DirectColor.  The "mask" is the significant bits within the pixel.
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The "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").  Finally, "precision" refers
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to how much precision the pixel value contains for a particular primary.
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Parameters
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visual
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A GdkVisual.
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mask
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A pointer to a guint32 to be filled in, or NULL.
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[out][allow-none]
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shift
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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precision
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A pointer to a gint to be filled in, or NULL.
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[out][allow-none]
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Since: 2.22
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gdk_visual_get_visual_type ()
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GdkVisualType
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gdk_visual_get_visual_type (GdkVisual *visual);
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Returns the type of visual this is (PseudoColor, TrueColor, etc).
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Parameters
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visual
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A GdkVisual.
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Returns
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 A GdkVisualType stating the type of visual
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.
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Since: 2.22
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Types and Values
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GdkVisual
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typedef struct {
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  GObject parent_instance;
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  GdkVisualType GSEAL (type);
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  gint GSEAL (depth);
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  GdkByteOrder GSEAL (byte_order);
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  gint GSEAL (colormap_size);
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  gint GSEAL (bits_per_rgb);
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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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} GdkVisual;
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enum GdkVisualType
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Members
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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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enum GdkByteOrder
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Members
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GDK_LSB_FIRST
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GDK_MSB_FIRST
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