gdkvisual.c 6.89 KB
Newer Older
Cody Russell's avatar
Cody Russell committed
1
/* GDK - The GIMP Drawing Kit
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 * gdkvisual.c
 * 
 * Copyright 2001 Sun Microsystems Inc. 
 *
 * Erwann Chenede <erwann.chenede@sun.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

24
#include "config.h"
25

26
#include "gdkvisual.h"
27

28
#include "gdkscreen.h"
29

30 31 32 33 34 35 36 37 38 39 40 41

/**
 * gdk_list_visuals:
 * 
 * Lists the available visuals for the default screen.
 * (See gdk_screen_list_visuals())
 * A visual describes a hardware image data format.
 * For example, a visual might support 24-bit color, or 8-bit color,
 * and might expect pixels to be in a certain format.
 *
 * Call g_list_free() on the return value when you're finished with it.
 * 
Matthias Clasen's avatar
Matthias Clasen committed
42 43
 * Return value: (transfer container) (element-type GdkVisual):
 *     a list of visuals; the list must be freed, but not its contents
44 45 46 47
 **/
GList*
gdk_list_visuals (void)
{
Owen Taylor's avatar
Owen Taylor committed
48
  return gdk_screen_list_visuals (gdk_screen_get_default ());
49 50 51 52 53
}

/**
 * gdk_visual_get_system:
 * 
54
 * Get the system's default visual for the default GDK screen.
55 56 57
 * This is the visual for the root window of the display.
 * The return value should not be freed.
 * 
58
 * Return value: (transfer none): system visual
59 60 61 62
 **/
GdkVisual*
gdk_visual_get_system (void)
{
Owen Taylor's avatar
Owen Taylor committed
63
  return gdk_screen_get_system_visual (gdk_screen_get_default());
64
}
65

Matthias Clasen's avatar
Matthias Clasen committed
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
/**
 * gdk_visual_get_visual_type:
 * @visual: A #GdkVisual.
 *
 * Returns the type of visual this is (PseudoColor, TrueColor, etc).
 *
 * Return value: A #GdkVisualType stating the type of @visual.
 *
 * Since: 2.22
 */
GdkVisualType
gdk_visual_get_visual_type (GdkVisual *visual)
{
  g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);

  return visual->type;
}

/**
 * gdk_visual_get_depth:
 * @visual: A #GdkVisual.
 *
 * Returns the bit depth of this visual.
 *
 * Return value: The bit depth of this visual.
 *
 * Since: 2.22
 */
gint
gdk_visual_get_depth (GdkVisual *visual)
{
  g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);

  return visual->depth;
}

/**
 * gdk_visual_get_byte_order:
 * @visual: A #GdkVisual.
 *
 * Returns the byte order of this visual.
 *
 * Return value: A #GdkByteOrder stating the byte order of @visual.
 *
 * Since: 2.22
 */
GdkByteOrder
gdk_visual_get_byte_order (GdkVisual *visual)
{
  g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);

  return visual->byte_order;
}

/**
 * gdk_visual_get_colormap_size:
 * @visual: A #GdkVisual.
 *
 * Returns the size of a colormap for this visual.
 *
 * Return value: The size of a colormap that is suitable for @visual.
 *
 * Since: 2.22
 */
gint
gdk_visual_get_colormap_size (GdkVisual *visual)
{
  g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);

  return visual->colormap_size;
}

/**
 * gdk_visual_get_bits_per_rgb:
 * @visual: a #GdkVisual
 *
 * Returns the number of significant bits per red, green and blue value.
 *
 * Return value: The number of significant bits per color value for @visual.
 *
 * Since: 2.22
 */
gint
gdk_visual_get_bits_per_rgb (GdkVisual *visual)
{
  g_return_val_if_fail (GDK_IS_VISUAL (visual), 0);

  return visual->bits_per_rgb;
}

/**
 * gdk_visual_get_red_pixel_details:
 * @visual: A #GdkVisual.
 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 *
 * Obtains values that are needed to calculate red pixel values in TrueColor
 * and DirectColor.  The "mask" is the significant bits within the pixel.
 * The "shift" is the number of bits left we must shift a primary for it
 * to be in position (according to the "mask").  Finally, "precision" refers
 * to how much precision the pixel value contains for a particular primary.
 *
 * Since: 2.22
 */
void
gdk_visual_get_red_pixel_details (GdkVisual *visual,
                                  guint32   *mask,
                                  gint      *shift,
                                  gint      *precision)
{
  g_return_if_fail (GDK_IS_VISUAL (visual));

  if (mask)
    *mask = visual->red_mask;

  if (shift)
    *shift = visual->red_shift;

  if (precision)
    *precision = visual->red_prec;
}

/**
 * gdk_visual_get_green_pixel_details:
 * @visual: a #GdkVisual
 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 *
 * Obtains values that are needed to calculate green pixel values in TrueColor
 * and DirectColor.  The "mask" is the significant bits within the pixel.
 * The "shift" is the number of bits left we must shift a primary for it
 * to be in position (according to the "mask").  Finally, "precision" refers
 * to how much precision the pixel value contains for a particular primary.
 *
 * Since: 2.22
 */
void
gdk_visual_get_green_pixel_details (GdkVisual *visual,
                                    guint32   *mask,
                                    gint      *shift,
                                    gint      *precision)
{
  g_return_if_fail (GDK_IS_VISUAL (visual));

  if (mask)
    *mask = visual->green_mask;

  if (shift)
    *shift = visual->green_shift;

  if (precision)
    *precision = visual->green_prec;
}

/**
 * gdk_visual_get_blue_pixel_details:
 * @visual: a #GdkVisual
 * @mask: (out) (allow-none): A pointer to a #guint32 to be filled in, or %NULL.
 * @shift: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 * @precision: (out) (allow-none): A pointer to a #gint to be filled in, or %NULL.
 *
 * Obtains values that are needed to calculate blue pixel values in TrueColor
 * and DirectColor.  The "mask" is the significant bits within the pixel.
 * The "shift" is the number of bits left we must shift a primary for it
 * to be in position (according to the "mask").  Finally, "precision" refers
 * to how much precision the pixel value contains for a particular primary.
 *
 * Since: 2.22
 */
void
gdk_visual_get_blue_pixel_details (GdkVisual *visual,
                                   guint32   *mask,
                                   gint      *shift,
                                   gint      *precision)
{
  g_return_if_fail (GDK_IS_VISUAL (visual));

  if (mask)
    *mask = visual->blue_mask;

  if (shift)
    *shift = visual->blue_shift;

  if (precision)
    *precision = visual->blue_prec;
}