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gtk/gdk/win32/gdkvisual-win32.c
Tim Janik afee2c67c5 applied patch from Andreas Persenius <ndap@swipnet.se> that updates the 
Wed Jul 26 12:59:31 2000  Tim Janik  <timj@gtk.org>

        * *.[hc]: applied patch from Andreas Persenius <ndap@swipnet.se> that
        updates the license headers to the GNU Lesser General Public License,
        as well as updating the copyright year to 2000.
2000-07-26 11:33:08 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 "gdkvisual.h"
#include "gdkprivate-win32.h"
static void gdk_visual_decompose_mask (gulong mask,
gint *shift,
gint *prec);
static GdkVisualPrivate *system_visual;
static gint available_depths[1];
static GdkVisualType available_types[1];
void
gdk_visual_init (void)
{
struct
{
BITMAPINFOHEADER bi;
union
{
RGBQUAD colors[256];
DWORD fields[256];
} u;
} bmi;
HBITMAP hbm;
int rastercaps, numcolors, sizepalette, bitspixel;
system_visual = g_new (GdkVisualPrivate, 1);
bitspixel = GetDeviceCaps (gdk_display_hdc, BITSPIXEL);
rastercaps = GetDeviceCaps (gdk_display_hdc, RASTERCAPS);
system_visual->xvisual = g_new (Visual, 1);
system_visual->xvisual->visualid = 0;
system_visual->xvisual->bitspixel = bitspixel;
if (rastercaps & RC_PALETTE)
{
system_visual->visual.type = GDK_VISUAL_PSEUDO_COLOR;
numcolors = GetDeviceCaps (gdk_display_hdc, NUMCOLORS);
sizepalette = GetDeviceCaps (gdk_display_hdc, SIZEPALETTE);
system_visual->xvisual->map_entries = sizepalette;
}
else if (bitspixel == 1)
{
system_visual->visual.type = GDK_VISUAL_STATIC_GRAY;
system_visual->xvisual->map_entries = 2;
}
else if (bitspixel == 4)
{
system_visual->visual.type = GDK_VISUAL_STATIC_COLOR;
system_visual->xvisual->map_entries = 16;
}
else if (bitspixel == 8)
{
system_visual->visual.type = GDK_VISUAL_STATIC_COLOR;
system_visual->xvisual->map_entries = 256;
}
else if (bitspixel == 16)
{
system_visual->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->visual.red_mask = 0x00007C00;
system_visual->visual.green_mask = 0x000003E0;
system_visual->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->visual.red_mask = bmi.u.fields[0];
system_visual->visual.green_mask = bmi.u.fields[1];
system_visual->visual.blue_mask = bmi.u.fields[2];
}
#else
/* Old, incorrect (but still working) code. */
#if 0
system_visual->visual.red_mask = 0x0000F800;
system_visual->visual.green_mask = 0x000007E0;
system_visual->visual.blue_mask = 0x0000001F;
#else
system_visual->visual.red_mask = 0x00007C00;
system_visual->visual.green_mask = 0x000003E0;
system_visual->visual.blue_mask = 0x0000001F;
#endif
#endif
}
else if (bitspixel == 24 || bitspixel == 32)
{
bitspixel = 24;
system_visual->visual.type = GDK_VISUAL_TRUE_COLOR;
system_visual->visual.red_mask = 0x00FF0000;
system_visual->visual.green_mask = 0x0000FF00;
system_visual->visual.blue_mask = 0x000000FF;
}
else
g_error ("gdk_visual_init: unsupported BITSPIXEL: %d\n", bitspixel);
system_visual->visual.depth = bitspixel;
system_visual->visual.byte_order = GDK_LSB_FIRST;
system_visual->visual.bits_per_rgb = 42; /* Not used? */
if ((system_visual->visual.type == GDK_VISUAL_TRUE_COLOR) ||
(system_visual->visual.type == GDK_VISUAL_DIRECT_COLOR))
{
gdk_visual_decompose_mask (system_visual->visual.red_mask,
&system_visual->visual.red_shift,
&system_visual->visual.red_prec);
gdk_visual_decompose_mask (system_visual->visual.green_mask,
&system_visual->visual.green_shift,
&system_visual->visual.green_prec);
gdk_visual_decompose_mask (system_visual->visual.blue_mask,
&system_visual->visual.blue_shift,
&system_visual->visual.blue_prec);
system_visual->xvisual->map_entries =
1 << (MAX (system_visual->visual.red_prec,
MAX (system_visual->visual.green_prec,
system_visual->visual.blue_prec)));
}
else
{
system_visual->visual.red_mask = 0;
system_visual->visual.red_shift = 0;
system_visual->visual.red_prec = 0;
system_visual->visual.green_mask = 0;
system_visual->visual.green_shift = 0;
system_visual->visual.green_prec = 0;
system_visual->visual.blue_mask = 0;
system_visual->visual.blue_shift = 0;
system_visual->visual.blue_prec = 0;
}
system_visual->visual.colormap_size = system_visual->xvisual->map_entries;
available_depths[0] = system_visual->visual.depth;
available_types[0] = system_visual->visual.type;
}
GdkVisual*
gdk_visual_ref (GdkVisual *visual)
{
return visual;
}
void
gdk_visual_unref (GdkVisual *visual)
{
return;
}
gint
gdk_visual_get_best_depth (void)
{
return available_depths[0];
}
GdkVisualType
gdk_visual_get_best_type (void)
{
return available_types[0];
}
GdkVisual*
gdk_visual_get_system (void)
{
return ((GdkVisual*) 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->visual.depth)
return (GdkVisual*) system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_type (GdkVisualType visual_type)
{
if (visual_type == system_visual->visual.type)
return (GdkVisual*) system_visual;
else
return NULL;
}
GdkVisual*
gdk_visual_get_best_with_both (gint depth,
GdkVisualType visual_type)
{
if ((depth == system_visual->visual.depth) &&
(visual_type == system_visual->visual.type))
return (GdkVisual*) 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_list_visuals (void)
{
return g_list_append (NULL, (gpointer) system_visual);
}
GdkVisual*
gdk_visual_lookup (Visual *xvisual)
{
if (system_visual->xvisual == xvisual)
return (GdkVisual *) system_visual;
else
return NULL;
}
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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