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gtk/gdk/win32/gdkvisual-win32.c
Tor Lillqvist 64f6d8cd7f Handle 16 colour display mode. For some reason, in this mode 
2005-04-05  Tor Lillqvist  <tml@novell.com>

	* gdk/win32/gdkvisual-win32.c (_gdk_visual_init): Handle 16 colour
	display mode. For some reason, in this mode GetDeviceCaps(BITSPIXEL)
	returns 1 (but GetDeviceCaps(NUMCOLORS)	does return 16). (#143415)
2005-04-05 01:46:59 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 1998-2002 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <config.h>
#include <stdlib.h>
#include "gdkvisual.h"
#include "gdkscreen.h" /* gdk_screen_get_default() */
#include "gdkprivate-win32.h"
static void gdk_visual_decompose_mask (gulong mask,
gint *shift,
gint *prec);
static GdkVisual *system_visual = NULL;
static gint available_depths[1];
static GdkVisualType available_types[1];
static void
gdk_visual_finalize (GObject *object)
{
g_error ("A GdkVisual object was finalized. This should not happen");
}
static void
gdk_visual_class_init (GObjectClass *class)
{
class->finalize = gdk_visual_finalize;
}
GType
gdk_visual_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (GdkVisualClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_visual_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GdkVisual),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
};
object_type = g_type_register_static (G_TYPE_OBJECT,
"GdkVisual",
&object_info, 0);
}
return object_type;
}
void
_gdk_visual_init (void)
{
struct
{
BITMAPINFOHEADER bi;
union
{
RGBQUAD colors[256];
DWORD fields[256];
} u;
} bmi;
HBITMAP hbm;
const gint rastercaps = GetDeviceCaps (_gdk_display_hdc, RASTERCAPS);
const int numcolors = GetDeviceCaps (_gdk_display_hdc, NUMCOLORS);
gint bitspixel = GetDeviceCaps (_gdk_display_hdc, BITSPIXEL);
gint map_entries = 0;
system_visual = g_object_new (GDK_TYPE_VISUAL, NULL);
GDK_NOTE (COLORMAP, g_print ("BITSPIXEL=%d NUMCOLORS=%d\n",
bitspixel, numcolors));
if (rastercaps & RC_PALETTE)
{
const int sizepalette = GetDeviceCaps (_gdk_display_hdc, SIZEPALETTE);
gchar *max_colors = getenv ("GDK_WIN32_MAX_COLORS");
system_visual->type = GDK_VISUAL_PSEUDO_COLOR;
GDK_NOTE (COLORMAP, g_print ("SIZEPALETTE=%d\n", sizepalette));
g_assert (sizepalette == 256);
if (max_colors != NULL)
_gdk_max_colors = atoi (max_colors);
map_entries = _gdk_max_colors;
if (map_entries >= 16 && map_entries < sizepalette)
{
/* The calls to gdk_rgb_set_min_colors() here have knowledge
* of what color cubes gdk_rgb_do_colormaps() will try, and
* of the static system palette colors... XXX
*/
if (map_entries < 32)
{
map_entries = 16;
system_visual->type = GDK_VISUAL_STATIC_COLOR;
bitspixel = 4;
gdk_rgb_set_min_colors (2*2*2);
}
else if (map_entries < 64)
{
map_entries = 32;
bitspixel = 5;
gdk_rgb_set_min_colors (3*3*3);
}
else if (map_entries < 128)
{
map_entries = 64;
bitspixel = 6;
gdk_rgb_set_min_colors (3*3*3);
}
else if (map_entries < 256)
{
map_entries = 128;
bitspixel = 7;
gdk_rgb_set_min_colors (5*5*4);
}
else
g_assert_not_reached ();
}
else
map_entries = sizepalette;
}
else if (bitspixel == 1 && numcolors == 16)
{
bitspixel = 4;
system_visual->type = GDK_VISUAL_STATIC_COLOR;
map_entries = 16;
}
else if (bitspixel == 1)
{
system_visual->type = GDK_VISUAL_STATIC_GRAY;
map_entries = 2;
}
else if (bitspixel == 4)
{
system_visual->type = GDK_VISUAL_STATIC_COLOR;
map_entries = 16;
}
else if (bitspixel == 8)
{
system_visual->type = GDK_VISUAL_STATIC_COLOR;
map_entries = 256;
}
else if (bitspixel == 16)
{
system_visual->type = GDK_VISUAL_TRUE_COLOR;
#if 1
/* This code by Mike Enright,
* see http://www.users.cts.com/sd/m/menright/display.html
*/
memset (&bmi, 0, sizeof (bmi));
bmi.bi.biSize = sizeof (bmi.bi);
hbm = CreateCompatibleBitmap (_gdk_display_hdc, 1, 1);
GetDIBits (_gdk_display_hdc, hbm, 0, 1, NULL,
(BITMAPINFO *) &bmi, DIB_RGB_COLORS);
GetDIBits (_gdk_display_hdc, hbm, 0, 1, NULL,
(BITMAPINFO *) &bmi, DIB_RGB_COLORS);
DeleteObject (hbm);
if (bmi.bi.biCompression != BI_BITFIELDS)
{
/* Either BI_RGB or BI_RLE_something
* .... or perhaps (!!) something else.
* Theoretically biCompression might be
* mmioFourCC('c','v','i','d') but I doubt it.
*/
if (bmi.bi.biCompression == BI_RGB)
{
/* It's 555 */
bitspixel = 15;
system_visual->red_mask = 0x00007C00;
system_visual->green_mask = 0x000003E0;
system_visual->blue_mask = 0x0000001F;
}
else
{
g_assert_not_reached ();
}
}
else
{
DWORD allmasks =
bmi.u.fields[0] | bmi.u.fields[1] | bmi.u.fields[2];
int k = 0;
while (allmasks)
{
if (allmasks&1)
k++;
allmasks/=2;
}
bitspixel = k;
system_visual->red_mask = bmi.u.fields[0];
system_visual->green_mask = bmi.u.fields[1];
system_visual->blue_mask = bmi.u.fields[2];
}
#else
/* Old, incorrect (but still working) code. */
#if 0
system_visual->red_mask = 0x0000F800;
system_visual->green_mask = 0x000007E0;
system_visual->blue_mask = 0x0000001F;
#else
system_visual->red_mask = 0x00007C00;
system_visual->green_mask = 0x000003E0;
system_visual->blue_mask = 0x0000001F;
#endif
#endif
}
else if (bitspixel == 24 || bitspixel == 32)
{
system_visual->type = GDK_VISUAL_TRUE_COLOR;
system_visual->red_mask = 0x00FF0000;
system_visual->green_mask = 0x0000FF00;
system_visual->blue_mask = 0x000000FF;
}
else
g_error ("_gdk_visual_init: unsupported BITSPIXEL: %d\n", bitspixel);
system_visual->depth = bitspixel;
system_visual->byte_order = GDK_LSB_FIRST;
system_visual->bits_per_rgb = 42; /* Not used? */
if ((system_visual->type == GDK_VISUAL_TRUE_COLOR) ||
(system_visual->type == GDK_VISUAL_DIRECT_COLOR))
{
gdk_visual_decompose_mask (system_visual->red_mask,
&system_visual->red_shift,
&system_visual->red_prec);
gdk_visual_decompose_mask (system_visual->green_mask,
&system_visual->green_shift,
&system_visual->green_prec);
gdk_visual_decompose_mask (system_visual->blue_mask,
&system_visual->blue_shift,
&system_visual->blue_prec);
map_entries = 1 << (MAX (system_visual->red_prec,
MAX (system_visual->green_prec,
system_visual->blue_prec)));
}
else
{
system_visual->red_mask = 0;
system_visual->red_shift = 0;
system_visual->red_prec = 0;
system_visual->green_mask = 0;
system_visual->green_shift = 0;
system_visual->green_prec = 0;
system_visual->blue_mask = 0;
system_visual->blue_shift = 0;
system_visual->blue_prec = 0;
}
system_visual->colormap_size = map_entries;
available_depths[0] = system_visual->depth;
available_types[0] = system_visual->type;
}
gint
gdk_visual_get_best_depth (void)
{
return available_depths[0];
}
GdkVisualType
gdk_visual_get_best_type (void)
{
return available_types[0];
}
GdkVisual*
gdk_screen_get_system_visual (GdkScreen *screen)
{
return system_visual;
}
GdkVisual*
gdk_visual_get_best (void)
{
return ((GdkVisual*) system_visual);
}
GdkVisual*
gdk_visual_get_best_with_depth (gint depth)
{
if (depth == system_visual->depth)
return (GdkVisual*) system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_type (GdkVisualType visual_type)
{
if (visual_type == system_visual->type)
return system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_both (gint depth,
GdkVisualType visual_type)
{
if ((depth == system_visual->depth) && (visual_type == system_visual->type))
return system_visual;
else
return NULL;
}
void
gdk_query_depths (gint **depths,
gint *count)
{
*count = 1;
*depths = available_depths;
}
void
gdk_query_visual_types (GdkVisualType **visual_types,
gint *count)
{
*count = 1;
*visual_types = available_types;
}
GList*
gdk_screen_list_visuals (GdkScreen *screen)
{
return g_list_append (NULL, (gpointer) system_visual);
}
GdkScreen *
gdk_visual_get_screen (GdkVisual *visual)
{
g_return_val_if_fail (GDK_IS_VISUAL (visual), NULL);
return gdk_screen_get_default ();
}
static void
gdk_visual_decompose_mask (gulong mask,
gint *shift,
gint *prec)
{
*shift = 0;
*prec = 0;
while (!(mask & 0x1))
{
(*shift)++;
mask >>= 1;
}
while (mask & 0x1)
{
(*prec)++;
mask >>= 1;
}
}
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