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sge_internal.h

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/*
*   SDL Graphics Extension
*   SGE internal header
*
*   Started 000627
*
*   License: LGPL v2+ (see the file LICENSE)
*   (c)2000-2001 Anders Lindström
*/

/*********************************************************************
 *  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. *
 *********************************************************************/

#ifndef sge_internal_H
#define sge_internal_H

/* This header is included in all sge_*.h files */

#include "sge_config.h"

/*
*  C compatibility
*/
#ifndef __cplusplus
    #define sge_C_ONLY
    #define _SGE_NO_CLASSES
#endif
#ifdef _SGE_C
    #define sge_C_ONLY
    #define _SGE_NO_CLASSES
#endif


/*
*  This is traditional
*/
#ifndef PI
    #define PI 3.1414926535
#endif


/*
*  Bit flags
*/
#define SGE_FLAG0 0x00
#define SGE_FLAG1 0x01
#define SGE_FLAG2 0x02
#define SGE_FLAG3 0x04
#define SGE_FLAG4 0x08
#define SGE_FLAG5 0x10
#define SGE_FLAG6 0x20
#define SGE_FLAG7 0x40
#define SGE_FLAG8 0x80


/*
*  Define the right alpha values 
*  (they were fliped in SDL 1.1.5+)
*/
#ifndef SDL_ALPHA_OPAQUE
    #define SDL_ALPHA_OPAQUE 0
#endif
#ifndef SDL_ALPHA_TRANSPARENT
    #define SDL_ALPHA_TRANSPARENT 255
#endif


/*
*  Older versions of SDL doesn't have SDL_VERSIONNUM
*/
#ifndef SDL_VERSIONNUM
    #define SDL_VERSIONNUM(X, Y, Z)      \
        (X)*1000 + (Y)*100 + (Z)
#endif


/*
*  Older versions of SDL doesn't have SDL_CreateRGBSurface
*/
#ifndef SDL_AllocSurface
    #define SDL_CreateRGBSurface  SDL_AllocSurface
#endif


/*
*  Macro to get clipping
*/
#if SDL_VERSIONNUM(SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL) >= \
    SDL_VERSIONNUM(1, 1, 5)
    #define sge_clip_xmin(pnt) pnt->clip_rect.x
    #define sge_clip_xmax(pnt) pnt->clip_rect.x + pnt->clip_rect.w-1
    #define sge_clip_ymin(pnt) pnt->clip_rect.y
    #define sge_clip_ymax(pnt) pnt->clip_rect.y + pnt->clip_rect.h-1
#else
    #define sge_clip_xmin(pnt) pnt->clip_minx
    #define sge_clip_xmax(pnt) pnt->clip_maxx
    #define sge_clip_ymin(pnt) pnt->clip_miny
    #define sge_clip_ymax(pnt) pnt->clip_maxy
#endif


/*
*  Macro to get the smallest bounding box from two (SDL_Rect) rectangles
*/
#define sge_RectUnion(dst_rect, rect1, rect2)\
    dst_rect.x = (rect1.x < rect2.x)? rect1.x:rect2.x;\
    dst_rect.y = (rect1.y < rect2.y)? rect1.y:rect2.y;\
    dst_rect.w = (rect1.x + rect1.w > rect2.x + rect2.w)? rect1.x + rect1.w - dst_rect.x : rect2.x + rect2.w - dst_rect.x;\
    dst_rect.h = (rect1.y + rect1.h > rect2.y + rect2.h)? rect1.y + rect1.h - dst_rect.y : rect2.y + rect2.h - dst_rect.y;


/*
*  We need to use alpha sometimes but older versions of SDL doesn't have
*  alpha support.
*/
#if SDL_VERSIONNUM(SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL) >= \
    SDL_VERSIONNUM(1, 1, 5)
    #define sge_MapRGBA SDL_MapRGBA
    #define sge_GetRGBA SDL_GetRGBA
#else
    #define sge_MapRGBA(fmt, r, g, b, a) SDL_MapRGB(fmt, r, g, b)
    #define sge_GetRGBA(pixel, fmt, r, g, b, a) SDL_GetRGBA(pixel, fmt, r, g, b)
#endif


/*
*  Some compilers use a special export keyword
*  Thanks to Seung Chan Lim (limsc@maya.com or slim@djslim.com) to pointing this out
*  (From SDL)
*/
#ifndef DECLSPEC
    #ifdef __BEOS__
        #if defined(__GNUC__)
            #define DECLSPEC __declspec(dllexport)
        #else
            #define DECLSPEC __declspec(export)
        #endif
    #else
    #ifdef WIN32
        #define DECLSPEC __declspec(dllexport)
    #else
        #define DECLSPEC
    #endif
    #endif
#endif

#endif /* sge_internal_H */

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