1 /* GDK - The GIMP Drawing Kit
4 * Copyright 2001 Sun Microsystems Inc.
6 * Erwann Chenede <erwann.chenede@sun.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
26 #include "gdkvisual.h"
28 #include "gdkscreen.h"
34 * Lists the available visuals for the default screen.
35 * (See gdk_screen_list_visuals())
36 * A visual describes a hardware image data format.
37 * For example, a visual might support 24-bit color, or 8-bit color,
38 * and might expect pixels to be in a certain format.
40 * Call g_list_free() on the return value when you're finished with it.
42 * Return value: (transfer container) (element-type GdkVisual):
43 * a list of visuals; the list must be freed, but not its contents
46 gdk_list_visuals (void)
48 return gdk_screen_list_visuals (gdk_screen_get_default ());
52 * gdk_visual_get_system:
54 * Get the system's default visual for the default GDK screen.
55 * This is the visual for the root window of the display.
56 * The return value should not be freed.
58 * Return value: (transfer none): system visual
61 gdk_visual_get_system (void)
63 return gdk_screen_get_system_visual (gdk_screen_get_default());
67 * gdk_visual_get_visual_type:
68 * @visual: A #GdkVisual.
70 * Returns the type of visual this is (PseudoColor, TrueColor, etc).
72 * Return value: A #GdkVisualType stating the type of @visual.
77 gdk_visual_get_visual_type (GdkVisual *visual)
79 g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
85 * gdk_visual_get_depth:
86 * @visual: A #GdkVisual.
88 * Returns the bit depth of this visual.
90 * Return value: The bit depth of this visual.
95 gdk_visual_get_depth (GdkVisual *visual)
97 g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
103 * gdk_visual_get_byte_order:
104 * @visual: A #GdkVisual.
106 * Returns the byte order of this visual.
108 * Return value: A #GdkByteOrder stating the byte order of @visual.
113 gdk_visual_get_byte_order (GdkVisual *visual)
115 g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
117 return visual->byte_order;
121 * gdk_visual_get_colormap_size:
122 * @visual: A #GdkVisual.
124 * Returns the size of a colormap for this visual.
126 * Return value: The size of a colormap that is suitable for @visual.
131 gdk_visual_get_colormap_size (GdkVisual *visual)
133 g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
135 return visual->colormap_size;
139 * gdk_visual_get_bits_per_rgb:
140 * @visual: a #GdkVisual
142 * Returns the number of significant bits per red, green and blue value.
144 * Return value: The number of significant bits per color value for @visual.
149 gdk_visual_get_bits_per_rgb (GdkVisual *visual)
151 g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);
153 return visual->bits_per_rgb;
157 * gdk_visual_get_red_pixel_details:
158 * @visual: A #GdkVisual.
159 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
160 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
161 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
163 * Obtains values that are needed to calculate red pixel values in TrueColor
164 * and DirectColor. The "mask" is the significant bits within the pixel.
165 * The "shift" is the number of bits left we must shift a primary for it
166 * to be in position (according to the "mask"). Finally, "precision" refers
167 * to how much precision the pixel value contains for a particular primary.
172 gdk_visual_get_red_pixel_details (GdkVisual *visual,
177 g_return_if_fail (GDK_IS_VISUAL (visual));
180 *mask = visual->red_mask;
183 *shift = visual->red_shift;
186 *precision = visual->red_prec;
190 * gdk_visual_get_green_pixel_details:
191 * @visual: a #GdkVisual
192 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
193 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
194 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
196 * Obtains values that are needed to calculate green pixel values in TrueColor
197 * and DirectColor. The "mask" is the significant bits within the pixel.
198 * The "shift" is the number of bits left we must shift a primary for it
199 * to be in position (according to the "mask"). Finally, "precision" refers
200 * to how much precision the pixel value contains for a particular primary.
205 gdk_visual_get_green_pixel_details (GdkVisual *visual,
210 g_return_if_fail (GDK_IS_VISUAL (visual));
213 *mask = visual->green_mask;
216 *shift = visual->green_shift;
219 *precision = visual->green_prec;
223 * gdk_visual_get_blue_pixel_details:
224 * @visual: a #GdkVisual
225 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
226 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
227 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
229 * Obtains values that are needed to calculate blue pixel values in TrueColor
230 * and DirectColor. The "mask" is the significant bits within the pixel.
231 * The "shift" is the number of bits left we must shift a primary for it
232 * to be in position (according to the "mask"). Finally, "precision" refers
233 * to how much precision the pixel value contains for a particular primary.
238 gdk_visual_get_blue_pixel_details (GdkVisual *visual,
243 g_return_if_fail (GDK_IS_VISUAL (visual));
246 *mask = visual->blue_mask;
249 *shift = visual->blue_shift;
252 *precision = visual->blue_prec;