descent/2D/BITMAP.C

/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.  
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/
/*
 * $Source: f:/miner/source/2d/rcs/bitmap.c $
 * $Revision: 1.17 $
 * $Author: john $
 * $Date: 1994/11/18 22:50:25 $
 *
 * Graphical routines for manipulating grs_bitmaps.
 *
 * $Log: bitmap.c $
 * Revision 1.17  1994/11/18  22:50:25  john
 * Changed shorts to ints in parameters.
 * 
 * Revision 1.16  1994/11/10  15:59:46  john
 * Fixed bugs with canvas's being created with bogus bm_flags.
 * 
 * Revision 1.15  1994/10/26  23:55:53  john
 * Took out roller; Took out inverse table.
 * 
 * Revision 1.14  1994/09/19  14:40:21  john
 * Changed dpmi stuff.
 * 
 * Revision 1.13  1994/09/19  11:44:04  john
 * Changed call to allocate selector to the dpmi module.
 * 
 * Revision 1.12  1994/06/09  13:14:57  john
 * Made selectors zero our
 * out, I meant.
 * 
 * Revision 1.11  1994/05/06  12:50:07  john
 * Added supertransparency; neatend things up; took out warnings.
 * 
 * Revision 1.10  1994/04/08  16:59:39  john
 * Add fading poly's; Made palette fade 32 instead of 16.
 * 
 * Revision 1.9  1994/03/16  17:21:09  john
 * Added slow palette searching options.
 * 
 * Revision 1.8  1994/03/14  17:59:35  john
 * Added function to check bitmap's transparency.
 * 
 * Revision 1.7  1994/03/14  17:16:21  john
 * fixed bug with counting freq of pixels.
 * 
 * Revision 1.6  1994/03/14  16:55:47  john
 * Changed grs_bitmap structure to include bm_flags.
 * 
 * Revision 1.5  1994/02/18  15:32:22  john
 * *** empty log message ***
 * 
 * Revision 1.4  1993/10/15  16:22:49  john
 * *** empty log message ***
 * 
 * Revision 1.3  1993/09/08  17:37:11  john
 * Checking for errors with Yuan...
 * 
 * Revision 1.2  1993/09/08  14:46:27  john
 * looking for possible bugs...
 * 
 * Revision 1.1  1993/09/08  11:43:05  john
 * Initial revision
 * 
 *
 */

#include <stdlib.h>
#include <malloc.h>
#include <stdio.h>

#include "mem.h"


#include "gr.h"
#include "grdef.h"
#include "dpmi.h"

grs_bitmap *gr_create_bitmap(int w, int h )
{
    grs_bitmap *new;

    new = (grs_bitmap *)malloc( sizeof(grs_bitmap) );
	new->bm_x = 0;
	new->bm_y = 0;
    new->bm_w = w;
    new->bm_h = h;
	new->bm_type = 0;
	new->bm_flags = 0;
	new->bm_rowsize = w;
	new->bm_selector = 0;

    new->bm_data = (unsigned char *)malloc( w*h );

    return new;
}

grs_bitmap *gr_create_bitmap_raw(int w, int h, unsigned char * raw_data )
{
	grs_bitmap *new;

	new = (grs_bitmap *)malloc( sizeof(grs_bitmap) );
	new->bm_x = 0;
	new->bm_y = 0;
	new->bm_w = w;
	new->bm_h = h;
	new->bm_flags = 0;
	new->bm_type = 0;
	new->bm_rowsize = w;
	new->bm_data = raw_data;
	new->bm_selector = 0;

	return new;
}

void gr_init_bitmap( grs_bitmap *bm, int mode, int x, int y, int w, int h, int bytesperline, unsigned char * data )
{
	bm->bm_x = x;
	bm->bm_y = y;
	bm->bm_w = w;
	bm->bm_h = h;
	bm->bm_flags = 0;
	bm->bm_type = mode;
	bm->bm_rowsize = bytesperline;
	bm->bm_data = data;
	bm->bm_selector = 0;
}


grs_bitmap *gr_create_sub_bitmap(grs_bitmap *bm, int x, int y, int w, int h )
{
    grs_bitmap *new;

    new = (grs_bitmap *)malloc( sizeof(grs_bitmap) );
	new->bm_x = x+bm->bm_x;
	new->bm_y = y+bm->bm_y;
	new->bm_w = w;
    new->bm_h = h;
	new->bm_flags = bm->bm_flags;
	new->bm_type = bm->bm_type;
	new->bm_rowsize = bm->bm_rowsize;
	new->bm_data = bm->bm_data+(unsigned int)((y*bm->bm_rowsize)+x);
	new->bm_selector = 0;

	return new;
}


gr_free_bitmap(grs_bitmap *bm )
{
	if (bm->bm_data!=NULL)	
    free(bm->bm_data);
	bm->bm_data = NULL;
	if (bm!=NULL)
    free(bm);
}

gr_free_sub_bitmap(grs_bitmap *bm )
{
	if (bm!=NULL)
    free(bm);
}

//NO_INVERSE_TABLE void build_colormap_asm( ubyte * palette, ubyte * cmap, int * count );
//NO_INVERSE_TABLE #pragma aux build_colormap_asm parm [esi] [edi] [edx] modify exact [eax ebx ecx edx esi edi] = \
//NO_INVERSE_TABLE 	"mov  ecx, 256"			\
//NO_INVERSE_TABLE 	"xor	eax,eax"				\
//NO_INVERSE_TABLE "again2x:"						\
//NO_INVERSE_TABLE 	"mov	al,[esi]"			\
//NO_INVERSE_TABLE 	"inc	esi"					\
//NO_INVERSE_TABLE 	"shr	eax, 1"				\
//NO_INVERSE_TABLE 	"shl	eax, 5"				\
//NO_INVERSE_TABLE 	"mov	bl,[esi]"			\
//NO_INVERSE_TABLE 	"inc	esi"					\
//NO_INVERSE_TABLE 	"shr	bl, 1"				\
//NO_INVERSE_TABLE 	"or	al, bl"				\
//NO_INVERSE_TABLE 	"shl	eax, 5"				\
//NO_INVERSE_TABLE 	"mov	bl,[esi]"			\
//NO_INVERSE_TABLE 	"inc	esi"					\
//NO_INVERSE_TABLE 	"shr	bl, 1"				\
//NO_INVERSE_TABLE 	"or 	al, bl"				\
//NO_INVERSE_TABLE 	"mov	al, gr_inverse_table[eax]"			\
//NO_INVERSE_TABLE 	"mov	[edi], al"			\
//NO_INVERSE_TABLE 	"inc	edi"					\
//NO_INVERSE_TABLE 	"xor	eax,eax"				\
//NO_INVERSE_TABLE 	"mov	[edx], eax"			\
//NO_INVERSE_TABLE 	"add	edx, 4"					\
//NO_INVERSE_TABLE 	"dec	ecx"					\
//NO_INVERSE_TABLE 	"jne	again2x"				\

void decode_data_asm(ubyte *data, int num_pixels, ubyte * colormap, int * count );
#pragma aux decode_data_asm parm [esi] [ecx] [edi] [ebx] modify exact [esi edi eax ebx ecx] = \
"again_ddn:"							\
	"xor	eax,eax"				\
	"mov	al,[esi]"			\
	"inc	dword ptr [ebx+eax*4]"		\
	"mov	al,[edi+eax]"		\
	"mov	[esi],al"			\
	"inc	esi"					\
	"dec	ecx"					\
	"jne	again_ddn"

void gr_remap_bitmap( grs_bitmap * bmp, ubyte * palette, int transparent_color, int super_transparent_color )
{
	ubyte colormap[256];
	int freq[256];

	// This should be build_colormap_asm, but we're not using invert table, so...
	build_colormap_good( palette, colormap, freq );

	if ( (super_transparent_color>=0) && (super_transparent_color<=255))
		colormap[super_transparent_color] = 254;

	if ( (transparent_color>=0) && (transparent_color<=255))
		colormap[transparent_color] = 255;

	decode_data_asm(bmp->bm_data, bmp->bm_w * bmp->bm_h, colormap, freq );

	if ( (transparent_color>=0) && (transparent_color<=255) && (freq[transparent_color]>0) )
		bmp->bm_flags |= BM_FLAG_TRANSPARENT;

	if ( (super_transparent_color>=0) && (super_transparent_color<=255) && (freq[super_transparent_color]>0) )
		bmp->bm_flags |= BM_FLAG_SUPER_TRANSPARENT;
}

void build_colormap_good( ubyte * palette, ubyte * colormap, int * freq )
{
	int i, r, g, b;

	for (i=0; i<256; i++ )	{
		r = *palette++;		
		g = *palette++;		
		b = *palette++;		
 		*colormap++ = gr_find_closest_color( r, g, b );
		*freq++ = 0;
	}
}


void gr_remap_bitmap_good( grs_bitmap * bmp, ubyte * palette, int transparent_color, int super_transparent_color )
{
	ubyte colormap[256];
	int freq[256];
   
	build_colormap_good( palette, colormap, freq );

	if ( (super_transparent_color>=0) && (super_transparent_color<=255))
		colormap[super_transparent_color] = 254;

	if ( (transparent_color>=0) && (transparent_color<=255))
		colormap[transparent_color] = 255;

	decode_data_asm(bmp->bm_data, bmp->bm_w * bmp->bm_h, colormap, freq );

	if ( (transparent_color>=0) && (transparent_color<=255) && (freq[transparent_color]>0) )
		bmp->bm_flags |= BM_FLAG_TRANSPARENT;

	if ( (super_transparent_color>=0) && (super_transparent_color<=255) && (freq[super_transparent_color]>0) )
		bmp->bm_flags |= BM_FLAG_SUPER_TRANSPARENT;
}


int gr_bitmap_assign_selector( grs_bitmap * bmp )
{
	if (!dpmi_allocate_selector( bmp->bm_data, bmp->bm_w*bmp->bm_h, &bmp->bm_selector )) {
		bmp->bm_selector = 0;
		return 1;
	}
	return 0;
}

void gr_bitmap_check_transparency( grs_bitmap * bmp )
{
	int x, y;
	ubyte * data;

	data = bmp->bm_data;
	
	for (y=0; y<bmp->bm_h; y++ )	{
		for (x=0; x<bmp->bm_w; x++ )	{
			if (*data++ == 255 )	{
				bmp->bm_flags = BM_FLAG_TRANSPARENT;
				return;
			}
		}
		data += bmp->bm_rowsize - bmp->bm_w;
	}

	bmp->bm_flags = 0;

}