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254 lines
6.9 KiB
C
254 lines
6.9 KiB
C
/* GDK - The GIMP Drawing Kit
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* gdkvisual.c
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*
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* Copyright 2001 Sun Microsystems Inc.
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*
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* Erwann Chenede <erwann.chenede@sun.com>
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library 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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#include "config.h"
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#include "gdkvisual.h"
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#include "gdkscreen.h"
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/**
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* gdk_list_visuals:
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*
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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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*
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* Call g_list_free() on the return value when you're finished with it.
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*
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* Return value: (transfer container) (element-type GdkVisual):
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* a list of visuals; the list must be freed, but not its contents
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**/
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GList*
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gdk_list_visuals (void)
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{
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return gdk_screen_list_visuals (gdk_screen_get_default ());
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}
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/**
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* gdk_visual_get_system:
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*
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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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*
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* Return value: (transfer none): system visual
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**/
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GdkVisual*
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gdk_visual_get_system (void)
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{
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return gdk_screen_get_system_visual (gdk_screen_get_default());
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}
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/**
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* gdk_visual_get_visual_type:
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* @visual: A #GdkVisual.
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*
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* Returns the type of visual this is (PseudoColor, TrueColor, etc).
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*
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* Return value: A #GdkVisualType stating the type of @visual.
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*
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* Since: 2.22
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*/
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GdkVisualType
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gdk_visual_get_visual_type (GdkVisual *visual)
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{
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g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
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return visual->type;
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}
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/**
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* gdk_visual_get_depth:
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* @visual: A #GdkVisual.
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*
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* Returns the bit depth of this visual.
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*
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* Return value: The bit depth of this visual.
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*
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* Since: 2.22
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*/
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gint
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gdk_visual_get_depth (GdkVisual *visual)
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{
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g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
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return visual->depth;
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}
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/**
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* gdk_visual_get_byte_order:
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* @visual: A #GdkVisual.
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*
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* Returns the byte order of this visual.
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*
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* Return value: A #GdkByteOrder stating the byte order of @visual.
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*
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* Since: 2.22
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*/
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GdkByteOrder
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gdk_visual_get_byte_order (GdkVisual *visual)
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{
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g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
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return visual->byte_order;
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}
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/**
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* gdk_visual_get_colormap_size:
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* @visual: A #GdkVisual.
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*
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* Returns the size of a colormap for this visual.
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*
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* Return value: 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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*/
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gint
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gdk_visual_get_colormap_size (GdkVisual *visual)
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{
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g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
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return visual->colormap_size;
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}
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/**
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* gdk_visual_get_bits_per_rgb:
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* @visual: a #GdkVisual
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*
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* Returns the number of significant bits per red, green and blue value.
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*
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* Return value: 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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*/
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gint
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gdk_visual_get_bits_per_rgb (GdkVisual *visual)
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{
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g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
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return visual->bits_per_rgb;
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}
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/**
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* gdk_visual_get_red_pixel_details:
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* @visual: A #GdkVisual.
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* @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
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* @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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* @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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*
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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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*
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* Since: 2.22
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*/
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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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{
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g_return_if_fail (GDK_IS_VISUAL (visual));
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if (mask)
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*mask = visual->red_mask;
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if (shift)
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*shift = visual->red_shift;
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if (precision)
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*precision = visual->red_prec;
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}
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/**
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* gdk_visual_get_green_pixel_details:
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* @visual: a #GdkVisual
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* @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
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* @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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* @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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*
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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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*
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* Since: 2.22
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*/
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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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{
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g_return_if_fail (GDK_IS_VISUAL (visual));
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if (mask)
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*mask = visual->green_mask;
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if (shift)
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*shift = visual->green_shift;
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if (precision)
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*precision = visual->green_prec;
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}
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/**
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* gdk_visual_get_blue_pixel_details:
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* @visual: a #GdkVisual
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* @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
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* @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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* @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
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*
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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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*
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* Since: 2.22
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*/
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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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{
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g_return_if_fail (GDK_IS_VISUAL (visual));
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if (mask)
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*mask = visual->blue_mask;
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if (shift)
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*shift = visual->blue_shift;
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if (precision)
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*precision = visual->blue_prec;
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}
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