rw_dib.c

Go to the documentation of this file.

/*
Copyright (C) 1997-2001 Id Software, Inc.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program 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 General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
/*
** RW_DIB.C
**
** This handles DIB section management under Windows.
**
*/
#include "..\ref_soft\r_local.h"
#include "rw_win.h"
 
#ifndef _WIN32
#  error You should not be trying to compile this file on this platform
#endif
 
static qboolean s_systemcolors_saved;
 
static HGDIOBJ previously_selected_GDI_obj;
 
static int s_syspalindices[] = 
{
  COLOR_ACTIVEBORDER,
  COLOR_ACTIVECAPTION,
  COLOR_APPWORKSPACE,
  COLOR_BACKGROUND,
  COLOR_BTNFACE,
  COLOR_BTNSHADOW,
  COLOR_BTNTEXT,
  COLOR_CAPTIONTEXT,
  COLOR_GRAYTEXT,
  COLOR_HIGHLIGHT,
  COLOR_HIGHLIGHTTEXT,
  COLOR_INACTIVEBORDER,
 
  COLOR_INACTIVECAPTION,
  COLOR_MENU,
  COLOR_MENUTEXT,
  COLOR_SCROLLBAR,
  COLOR_WINDOW,
  COLOR_WINDOWFRAME,
  COLOR_WINDOWTEXT
};
 
#define NUM_SYS_COLORS ( sizeof( s_syspalindices ) / sizeof( int ) )
 
static int s_oldsyscolors[NUM_SYS_COLORS];
 
typedef struct dibinfo
{
    BITMAPINFOHEADER    header;
    RGBQUAD             acolors[256];
} dibinfo_t;
 
typedef struct
{
    WORD palVersion;
    WORD palNumEntries;
    PALETTEENTRY palEntries[256];
} identitypalette_t;
 
static identitypalette_t s_ipal;
 
static void DIB_SaveSystemColors( void );
static void DIB_RestoreSystemColors( void );
 
/*
** DIB_Init
**
** Builds our DIB section
*/
qboolean DIB_Init( unsigned char **ppbuffer, int *ppitch )
{
    dibinfo_t   dibheader;
    BITMAPINFO *pbmiDIB = ( BITMAPINFO * ) &dibheader;
    int i;
 
    memset( &dibheader, 0, sizeof( dibheader ) );
 
    /*
    ** grab a DC
    */
    if ( !sww_state.hDC )
    {
        if ( ( sww_state.hDC = GetDC( sww_state.hWnd ) ) == NULL )
            return false;
    }
 
    /*
    ** figure out if we're running in an 8-bit display mode
    */
    if ( GetDeviceCaps( sww_state.hDC, RASTERCAPS ) & RC_PALETTE )
    {
        sww_state.palettized = true;
 
        // save system colors
        if ( !s_systemcolors_saved )
        {
            DIB_SaveSystemColors();
            s_systemcolors_saved = true;
        }
    }
    else
    {
        sww_state.palettized = false;
    }
 
    /*
    ** fill in the BITMAPINFO struct
    */
    pbmiDIB->bmiHeader.biSize          = sizeof(BITMAPINFOHEADER);
    pbmiDIB->bmiHeader.biWidth         = vid.width;
    pbmiDIB->bmiHeader.biHeight        = vid.height;
    pbmiDIB->bmiHeader.biPlanes        = 1;
    pbmiDIB->bmiHeader.biBitCount      = 8;
    pbmiDIB->bmiHeader.biCompression   = BI_RGB;
    pbmiDIB->bmiHeader.biSizeImage     = 0;
    pbmiDIB->bmiHeader.biXPelsPerMeter = 0;
    pbmiDIB->bmiHeader.biYPelsPerMeter = 0;
    pbmiDIB->bmiHeader.biClrUsed       = 256;
    pbmiDIB->bmiHeader.biClrImportant  = 256;
 
    /*
    ** fill in the palette
    */
    for ( i = 0; i < 256; i++ )
    {
        dibheader.acolors[i].rgbRed   = ( d_8to24table[i] >> 0 )  & 0xff;
        dibheader.acolors[i].rgbGreen = ( d_8to24table[i] >> 8 )  & 0xff;
        dibheader.acolors[i].rgbBlue  = ( d_8to24table[i] >> 16 ) & 0xff;
    }
 
    /*
    ** create the DIB section
    */
    sww_state.hDIBSection = CreateDIBSection( sww_state.hDC,
                                             pbmiDIB,
                                             DIB_RGB_COLORS,
                                             &sww_state.pDIBBase,
                                             NULL,
                                             0 );
 
    if ( sww_state.hDIBSection == NULL )
    {
        ri.Con_Printf( PRINT_ALL, "DIB_Init() - CreateDIBSection failed\n" );
        goto fail;
    }
 
    if ( pbmiDIB->bmiHeader.biHeight > 0 )
    {
        // bottom up
        *ppbuffer   = sww_state.pDIBBase + ( vid.height - 1 ) * vid.width;
        *ppitch     = -vid.width;
    }
    else
    {
        // top down
        *ppbuffer   = sww_state.pDIBBase;
        *ppitch     = vid.width;
    }
 
    /*
    ** clear the DIB memory buffer
    */
    memset( sww_state.pDIBBase, 0xff, vid.width * vid.height );
 
    if ( ( sww_state.hdcDIBSection = CreateCompatibleDC( sww_state.hDC ) ) == NULL )
    {
        ri.Con_Printf( PRINT_ALL, "DIB_Init() - CreateCompatibleDC failed\n" );
        goto fail;
    }
    if ( ( previously_selected_GDI_obj = SelectObject( sww_state.hdcDIBSection, sww_state.hDIBSection ) ) == NULL )
    {
        ri.Con_Printf( PRINT_ALL, "DIB_Init() - SelectObject failed\n" );
        goto fail;
    }
 
    return true;
 
fail:
    DIB_Shutdown();
    return false;
    
}
 
/*
** DIB_SetPalette
**
** Sets the color table in our DIB section, and also sets the system palette
** into an identity mode if we're running in an 8-bit palettized display mode.
**
** The palette is expected to be 1024 bytes, in the format:
**
** R = offset 0
** G = offset 1
** B = offset 2
** A = offset 3
*/
void DIB_SetPalette( const unsigned char *_pal )
{
    const unsigned char *pal = _pal;
    LOGPALETTE      *pLogPal = ( LOGPALETTE * ) &s_ipal;
    RGBQUAD         colors[256];
    int             i;
    int             ret;
    HDC             hDC = sww_state.hDC;
 
    /*
    ** set the DIB color table
    */
    if ( sww_state.hdcDIBSection )
    {
        for ( i = 0; i < 256; i++, pal += 4 )
        {
            colors[i].rgbRed   = pal[0];
            colors[i].rgbGreen = pal[1];
            colors[i].rgbBlue  = pal[2];
            colors[i].rgbReserved = 0;
        }
 
        colors[0].rgbRed = 0;
        colors[0].rgbGreen = 0;
        colors[0].rgbBlue = 0;
 
        colors[255].rgbRed = 0xff;
        colors[255].rgbGreen = 0xff;
        colors[255].rgbBlue = 0xff;
 
        if ( SetDIBColorTable( sww_state.hdcDIBSection, 0, 256, colors ) == 0 )
        {
            ri.Con_Printf( PRINT_ALL, "DIB_SetPalette() - SetDIBColorTable failed\n" );
        }
    }
 
    /*
    ** for 8-bit color desktop modes we set up the palette for maximum
    ** speed by going into an identity palette mode.
    */
    if ( sww_state.palettized )
    {
        int i;
        HPALETTE hpalOld;
 
        if ( SetSystemPaletteUse( hDC, SYSPAL_NOSTATIC ) == SYSPAL_ERROR )
        {
            ri.Sys_Error( ERR_FATAL, "DIB_SetPalette() - SetSystemPaletteUse() failed\n" );
        }
 
        /*
        ** destroy our old palette
        */
        if ( sww_state.hPal )
        {
            DeleteObject( sww_state.hPal );
            sww_state.hPal = 0;
        }
 
        /*
        ** take up all physical palette entries to flush out anything that's currently
        ** in the palette
        */
        pLogPal->palVersion     = 0x300;
        pLogPal->palNumEntries  = 256;
 
        for ( i = 0, pal = _pal; i < 256; i++, pal += 4 )
        {
            pLogPal->palPalEntry[i].peRed   = pal[0];
            pLogPal->palPalEntry[i].peGreen = pal[1];
            pLogPal->palPalEntry[i].peBlue  = pal[2];
            pLogPal->palPalEntry[i].peFlags = PC_RESERVED | PC_NOCOLLAPSE;
        }
        pLogPal->palPalEntry[0].peRed       = 0;
        pLogPal->palPalEntry[0].peGreen     = 0;
        pLogPal->palPalEntry[0].peBlue      = 0;
        pLogPal->palPalEntry[0].peFlags     = 0;
        pLogPal->palPalEntry[255].peRed     = 0xff;
        pLogPal->palPalEntry[255].peGreen   = 0xff;
        pLogPal->palPalEntry[255].peBlue    = 0xff;
        pLogPal->palPalEntry[255].peFlags   = 0;
 
        if ( ( sww_state.hPal = CreatePalette( pLogPal ) ) == NULL )
        {
            ri.Sys_Error( ERR_FATAL, "DIB_SetPalette() - CreatePalette failed(%x)\n", GetLastError() );
        }
 
        if ( ( hpalOld = SelectPalette( hDC, sww_state.hPal, FALSE ) ) == NULL )
        {
            ri.Sys_Error( ERR_FATAL, "DIB_SetPalette() - SelectPalette failed(%x)\n",GetLastError() );
        }
 
        if ( sww_state.hpalOld == NULL )
            sww_state.hpalOld = hpalOld;
 
        if ( ( ret = RealizePalette( hDC ) ) != pLogPal->palNumEntries ) 
        {
            ri.Sys_Error( ERR_FATAL, "DIB_SetPalette() - RealizePalette set %d entries\n", ret );
        }
    }
}
 
/*
** DIB_Shutdown
*/
void DIB_Shutdown( void )
{
    if ( sww_state.palettized && s_systemcolors_saved )
        DIB_RestoreSystemColors();
 
    if ( sww_state.hPal )
    {
        DeleteObject( sww_state.hPal );
        sww_state.hPal = 0;
    }
 
    if ( sww_state.hpalOld )
    {
        SelectPalette( sww_state.hDC, sww_state.hpalOld, FALSE );
        RealizePalette( sww_state.hDC );
        sww_state.hpalOld = NULL;
    }
 
    if ( sww_state.hdcDIBSection )
    {
        SelectObject( sww_state.hdcDIBSection, previously_selected_GDI_obj );
        DeleteDC( sww_state.hdcDIBSection );
        sww_state.hdcDIBSection = NULL;
    }
 
    if ( sww_state.hDIBSection )
    {
        DeleteObject( sww_state.hDIBSection );
        sww_state.hDIBSection = NULL;
        sww_state.pDIBBase = NULL;
    }
 
    if ( sww_state.hDC )
    {
        ReleaseDC( sww_state.hWnd, sww_state.hDC );
        sww_state.hDC = 0;
    }
}
 
 
/*
** DIB_Save/RestoreSystemColors
*/
static void DIB_RestoreSystemColors( void )
{
    SetSystemPaletteUse( sww_state.hDC, SYSPAL_STATIC );
    SetSysColors( NUM_SYS_COLORS, s_syspalindices, s_oldsyscolors );
}
 
static void DIB_SaveSystemColors( void )
{
    int i;
 
    for ( i = 0; i < NUM_SYS_COLORS; i++ )
        s_oldsyscolors[i] = GetSysColor( s_syspalindices[i] );
}