/*** thinlib (c) 2000 Matthew Conte (matt@conte.com)****** This program is free software; you can redistribute it and/or** modify it under the terms of version 2 of the GNU Library General ** Public License as published by the Free Software Foundation.**** 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 ** Library General Public License for more details.  To obtain a ** copy of the GNU Library General Public License, write to the Free ** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.**** Any permitted reproduction of these routines, in whole or in part,** must bear this legend.****** tl_bmp.c**** Bitmap object manipulation routines** $Id: tl_bmp.c,v 1.4 2001/03/12 06:06:55 matt Exp $*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include "tl_types.h"#include "tl_bmp.h"void thin_bmp_clear(const bitmap_t *bitmap, uint8 color){   memset(bitmap->data, color, bitmap->pitch * bitmap->height);}#define  BPP_PITCH(pitch, bpp)   ((pitch) * (((bpp) + 7) / 8))static bitmap_t *_make_bitmap(uint8 *data_addr, bool hw, int width,                               int height, int bpp, int pitch, int overdraw){   bitmap_t *bitmap;   int i;   /* sometimes our data address is zero - in the case   ** of setting video selectors for VESA mode with far pointers.   */   /* Make sure to add in space for line pointers */   bitmap = malloc(sizeof(bitmap_t) + (sizeof(uint8 *) * height));   if (NULL == bitmap)      return NULL;   bitmap->hardware = hw;   bitmap->height = height;   bitmap->width = width;   bitmap->bpp = bpp;   bitmap->data = data_addr;   bitmap->pitch = BPP_PITCH(pitch, bpp);   /* Set up line pointers */   bitmap->line[0] = bitmap->data + overdraw;   for (i = 1; i < height; i++)      bitmap->line[i] = bitmap->line[i - 1] + bitmap->pitch;   return bitmap;}/* Allocate and initialize a bitmap structure */bitmap_t *thin_bmp_create(int width, int height, int bpp, int overdraw){   uint8 *addr;      /* left and right overdraw, and dword aligned */   int pitch = width + (overdraw * 2);   pitch = (pitch + 3) & ~3;   addr = malloc(height * BPP_PITCH(pitch, bpp));   if (NULL == addr)      return NULL;   return _make_bitmap(addr, false, width, height, bpp, pitch, overdraw);}/* allocate and initialize a hardware bitmap */bitmap_t *thin_bmp_createhw(uint8 *addr, int width, int height, int bpp, int pitch){   return _make_bitmap(addr, true, width, height, bpp, pitch, 0); /* zero overdraw */}/* Deallocate space for a bitmap structure */void thin_bmp_destroy(bitmap_t **bitmap){   if (*bitmap)   {      if ((*bitmap)->data && false == (*bitmap)->hardware)         free((*bitmap)->data);      free(*bitmap);      *bitmap = NULL;   }}/*** $Log: tl_bmp.c,v $** Revision 1.4  2001/03/12 06:06:55  matt** better keyboard driver, support for bit depths other than 8bpp**** Revision 1.3  2001/02/19 02:55:01  matt** our service department is now accepting null pointers.**** Revision 1.2  2001/02/01 06:28:26  matt** thinlib now works under NT/2000**** Revision 1.1  2000/11/05 16:32:15  matt** initial revision***/