palette.c

开放源码的编译器open watcom 1.6.0版的源代码

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  Create DIB palette (HPALETTE) from a bitmap (BITMAPINFO).
*
****************************************************************************/


#include <windows.h>
#include <stdlib.h>
#include "mem.h"

void MemFree( void *ptr );
void *MemAlloc( unsigned size );
void *MemReAlloc( void *ptr, unsigned size );
void MemStart( void );

HPALETTE CreateDIBPalette( BITMAPINFO *info )
{
    unsigned            num_colours, i;
    LOGPALETTE          *palette;
    HPALETTE            palette_handle;
    RGBQUAD             *quads;

    num_colours = info->bmiHeader.biClrUsed;
    if( num_colours == 0 && info->bmiHeader.biBitCount != 24 ) {
        num_colours = 1 << info->bmiHeader.biBitCount;
    }

    palette_handle = (HPALETTE)0;

    if( num_colours ) {
        palette = MemAlloc( sizeof( LOGPALETTE ) +
                num_colours * sizeof( PALETTEENTRY ) );
        if( palette == NULL ) return( (HPALETTE)0 );
        palette->palNumEntries = num_colours;
        palette->palVersion = 0x300;

        quads = &info->bmiColors[0];
        for( i = 0; i < num_colours; i++ ) {
            palette->palPalEntry[i].peRed = quads[i].rgbRed;
            palette->palPalEntry[i].peGreen = quads[i].rgbGreen;
            palette->palPalEntry[i].peBlue = quads[i].rgbBlue;
            palette->palPalEntry[i].peFlags = 0;
        }
        palette_handle = CreatePalette( palette );
        MemFree( palette );
    }
    return( palette_handle );
}