v_patch.h

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//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
// DESCRIPTION:
//      Refresh/rendering module, shared data struct definitions.
//
 
 
#ifndef V_PATCH_H
#define V_PATCH_H
 
// Patches.
// A patch holds one or more columns.
// Patches are used for sprites and all masked pictures,
// and we compose textures from the TEXTURE1/2 lists
// of patches.
 
typedef struct 
{ 
    short       width;      // bounding box size 
    short       height; 
    short       leftoffset; // pixels to the left of origin 
    short       topoffset;  // pixels below the origin 
    int         columnofs[8];   // only [width] used
    // the [0] is &columnofs[width] 
} PACKEDATTR patch_t;
 
// posts are runs of non masked source pixels
typedef struct
{
    byte        topdelta;   // -1 is the last post in a column
    byte        length;     // length data bytes follows
} PACKEDATTR post_t;
 
// column_t is a list of 0 or more post_t, (byte)-1 terminated
typedef post_t  column_t;
 
#endif