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docs: Move documentation to inline comments: gdkvisual
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docs/reference/gdk/tmpl/.gitignore
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docs/reference/gdk/tmpl/.gitignore
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@ -12,4 +12,5 @@ keys.sgml
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pango_interaction.sgml
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pixbufs.sgml
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regions.sgml
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visuals.sgml
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windows.sgml
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@ -1,283 +0,0 @@
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<!-- ##### SECTION Title ##### -->
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Visuals
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<!-- ##### SECTION Short_Description ##### -->
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Low-level display hardware information
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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A #GdkVisual describes a particular video hardware display format. It includes
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information about the number of bits used for each color, the way the bits are
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translated into an RGB value for display, and the way the bits are stored in
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memory. For example, a piece of display hardware might support 24-bit color,
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16-bit color, or 8-bit color; meaning 24/16/8-bit pixel sizes. For a given
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pixel size, pixels can be in different formats; for example the "red" element
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of an RGB pixel may be in the top 8 bits of the pixel, or may be in the lower
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4 bits.
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</para>
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<para>
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There are several standard visuals. The visual returned
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by gdk_screen_get_system_visual() is the system's default
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visual.
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</para>
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<para>
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A number of functions are provided for determining
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the "best" available visual. For the purposes of
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making this determination, higher bit depths are
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considered better, and for visuals of the same
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bit depth, %GDK_VISUAL_PSEUDO_COLOR is preferred at
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8bpp, otherwise, the visual types are ranked in the
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order of (highest to lowest) %GDK_VISUAL_DIRECT_COLOR,
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%GDK_VISUAL_TRUE_COLOR, %GDK_VISUAL_PSEUDO_COLOR,
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%GDK_VISUAL_STATIC_COLOR, %GDK_VISUAL_GRAYSCALE,
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then %GDK_VISUAL_STATIC_GRAY.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### SECTION Image ##### -->
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<!-- ##### STRUCT GdkVisual ##### -->
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<para>
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The <type>GdkVisual</type> structure contains information about
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a particular visual.
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</para>
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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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@parent_instance: inherited portion from #GObject
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<!-- ##### ENUM GdkVisualType ##### -->
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<para>
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A set of values that describe the manner in which the
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pixel values for a visual are converted into RGB
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values for display.
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</para>
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@GDK_VISUAL_STATIC_GRAY: Each pixel value indexes a grayscale value directly.
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@GDK_VISUAL_GRAYSCALE: Each pixel is an index into a color map that maps pixel
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values into grayscale values. The color map can be 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 maps
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pixel values into rgb values. The color map can be changed by an application.
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@GDK_VISUAL_TRUE_COLOR: Each pixel value directly contains red, green,
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and blue components. The <structfield>red_mask</structfield>,
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<structfield>green_mask</structfield>, and
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<structfield>blue_mask</structfield> fields of the #GdkVisual
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structure describe how the components are assembled into 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 mapped via a
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color table into the final output table instead of being converted directly.
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<!-- ##### ENUM GdkByteOrder ##### -->
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<para>
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A set of values describing the possible byte-orders
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for storing pixel values in memory.
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</para>
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@GDK_LSB_FIRST: The values are stored with the least-significant byte
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first. For instance, the 32-bit value 0xffeecc would be stored
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in memory as 0xcc, 0xee, 0xff, 0x00.
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@GDK_MSB_FIRST: The values are stored with the most-significant byte
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first. For instance, the 32-bit value 0xffeecc would be stored
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in memory as 0x00, 0xcc, 0xee, 0xff.
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<!-- ##### FUNCTION gdk_query_depths ##### -->
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<para>
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</para>
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@depths:
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@count:
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<!-- ##### FUNCTION gdk_query_visual_types ##### -->
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<para>
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</para>
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@visual_types:
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@count:
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<!-- ##### FUNCTION gdk_list_visuals ##### -->
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<para>
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</para>
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@void:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_bits_per_rgb ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_blue_pixel_details ##### -->
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<para>
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</para>
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@visual:
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@mask:
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@shift:
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@precision:
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<!-- ##### FUNCTION gdk_visual_get_byte_order ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_colormap_size ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_depth ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_green_pixel_details ##### -->
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<para>
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</para>
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@visual:
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@mask:
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@shift:
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@precision:
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<!-- ##### FUNCTION gdk_visual_get_red_pixel_details ##### -->
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<para>
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</para>
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@visual:
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@mask:
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@shift:
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@precision:
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<!-- ##### FUNCTION gdk_visual_get_visual_type ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best_depth ##### -->
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<para>
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</para>
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@void:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best_type ##### -->
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<para>
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</para>
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@void:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_system ##### -->
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<para>
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</para>
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@void:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best ##### -->
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<para>
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</para>
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@void:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best_with_depth ##### -->
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<para>
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</para>
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@depth:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best_with_type ##### -->
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<para>
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</para>
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@visual_type:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_best_with_both ##### -->
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<para>
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</para>
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@depth:
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@visual_type:
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@Returns:
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<!-- ##### FUNCTION gdk_visual_get_screen ##### -->
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<para>
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</para>
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@visual:
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@Returns:
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@ -111,6 +111,18 @@ typedef struct _GdkDrawable GdkWindow;
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typedef struct _GdkDisplay GdkDisplay;
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typedef struct _GdkScreen GdkScreen;
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/**
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* GdkByteOrder:
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* @GDK_LSB_FIRST: The values are stored with the least-significant byte
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* first. For instance, the 32-bit value 0xffeecc would be stored
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* in memory as 0xcc, 0xee, 0xff, 0x00.
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* @GDK_MSB_FIRST: The values are stored with the most-significant byte
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* first. For instance, the 32-bit value 0xffeecc would be stored
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* in memory as 0x00, 0xcc, 0xee, 0xff.
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*
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* A set of values describing the possible byte-orders
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* for storing pixel values in memory.
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*/
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typedef enum
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{
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GDK_LSB_FIRST,
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@ -28,6 +28,33 @@
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#include "gdkscreen.h"
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/**
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* SECTION:visuals
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* @Short_description: Low-level display hardware information
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* @Title: Visuals
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*
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* A #GdkVisual describes a particular video hardware display format. It includes
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* information about the number of bits used for each color, the way the bits are
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* translated into an RGB value for display, and the way the bits are stored in
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* memory. For example, a piece of display hardware might support 24-bit color,
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* 16-bit color, or 8-bit color; meaning 24/16/8-bit pixel sizes. For a given
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* pixel size, pixels can be in different formats; for example the "red" element
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* of an RGB pixel may be in the top 8 bits of the pixel, or may be in the lower
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* 4 bits.
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*
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* There are several standard visuals. The visual returned by
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* gdk_screen_get_system_visual() is the system's default visual.
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*
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* A number of functions are provided for determining the "best" available visual.
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* For the purposes of making this determination, higher bit depths are considered
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* better, and for visuals of the same bit depth, %GDK_VISUAL_PSEUDO_COLOR is
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* preferred at 8bpp, otherwise, the visual types are ranked in the order of
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* (highest to lowest) %GDK_VISUAL_DIRECT_COLOR, %GDK_VISUAL_TRUE_COLOR,
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* %GDK_VISUAL_PSEUDO_COLOR, %GDK_VISUAL_STATIC_COLOR, %GDK_VISUAL_GRAYSCALE,
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* then %GDK_VISUAL_STATIC_GRAY.
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*/
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/**
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* gdk_list_visuals:
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*
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@ -79,29 +79,44 @@ typedef enum
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GDK_VISUAL_DIRECT_COLOR
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} GdkVisualType;
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/* The visual type.
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* "type" is the type of visual this is (PseudoColor, TrueColor, etc).
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* "depth" is the bit depth of this visual.
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* "colormap_size" is the size of a colormap for this visual.
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* "bits_per_rgb" is the 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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* 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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/*< private >*/
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GdkVisualType GSEAL (type);
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gint GSEAL (depth);
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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);
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gint GSEAL (bits_per_rgb);
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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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