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Amiga ACS 1998 #6
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descent
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canvas.c
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1998-06-08
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/*
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/canvas.c $
* $Revision: 1.14 $
* $Author: john $
* $Date: 1995/03/06 09:18:45 $
*
* Graphical routines for manipulating grs_canvas's.
*
* $Log: canvas.c $
* Revision 1.14 1995/03/06 09:18:45 john
* Made modex page flipping wait for retrace be default.
*
* Revision 1.13 1995/03/01 15:37:40 john
* Better ModeX support.
*
* Revision 1.12 1994/11/28 17:08:29 john
* Took out some unused functions in linear.asm, moved
* gr_linear_movsd from linear.asm to bitblt.c, made sure that
* the code in ibiblt.c sets the direction flags before rep movsing.
*
* Revision 1.11 1994/11/18 22:50:24 john
* Changed shorts to ints in parameters.
*
* Revision 1.10 1994/11/10 15:59:33 john
* Fixed bugs with canvas's being created with bogus bm_flags.
*
* Revision 1.9 1994/06/24 17:26:34 john
* Made rowsizes bigger than actual screen work with SVGA.
*
* Revision 1.8 1994/05/06 12:50:41 john
* Added supertransparency; neatend things up; took out warnings.
*
* Revision 1.7 1993/12/08 16:41:26 john
* fixed color = -1 bug
*
* Revision 1.6 1993/10/15 16:22:25 john
* *** empty log message ***
*
* Revision 1.5 1993/09/29 16:14:07 john
* added globol variables describing current canvas
*
* Revision 1.4 1993/09/14 16:03:40 matt
* Added new function, gr_clear_canvas()
*
* Revision 1.3 1993/09/14 13:51:38 matt
* in gr_init_sub_canvas(), copy bm_rowsize from source canvas
*
* Revision 1.2 1993/09/08 17:37:34 john
* Checking for potential errors
*
* Revision 1.1 1993/09/08 11:43:18 john
* Initial revision
*
*
*/
#include <stdlib.h>
#include <malloc.h>
#include <stdio.h>
#include "mem.h"
#include "gr.h"
#include "grdef.h"
grs_canvas * grd_curcanv; //active canvas
grs_screen * grd_curscreen; //active screen
grs_canvas *gr_create_canvas(int w, int h)
{
unsigned char * data;
grs_canvas *new;
new = (grs_canvas *)malloc( sizeof(grs_canvas) );
data = (unsigned char *)malloc(w*h);
new->cv_bitmap.bm_x = 0;
new->cv_bitmap.bm_y = 0;
new->cv_bitmap.bm_w = w;
new->cv_bitmap.bm_h = h;
new->cv_bitmap.bm_flags = 0;
new->cv_bitmap.bm_type = BM_LINEAR;
new->cv_bitmap.bm_rowsize = w;
new->cv_bitmap.bm_data = data;
new->cv_color = 0;
new->cv_drawmode = 0;
new->cv_font = NULL;
new->cv_font_fg_color = 0;
new->cv_font_bg_color = 0;
return new;
}
grs_canvas *gr_create_sub_canvas(grs_canvas *canv, int x, int y, int w, int h)
{
grs_canvas *new;
new = (grs_canvas *)malloc( sizeof(grs_canvas) );
new->cv_bitmap.bm_x = x+canv->cv_bitmap.bm_x;
new->cv_bitmap.bm_y = y+canv->cv_bitmap.bm_y;
new->cv_bitmap.bm_w = w;
new->cv_bitmap.bm_h = h;
new->cv_bitmap.bm_flags = 0;
new->cv_bitmap.bm_type = canv->cv_bitmap.bm_type;
new->cv_bitmap.bm_rowsize = canv->cv_bitmap.bm_rowsize;
new->cv_bitmap.bm_data = canv->cv_bitmap.bm_data;
new->cv_bitmap.bm_data += y*canv->cv_bitmap.bm_rowsize;
new->cv_bitmap.bm_data += x;
new->cv_color = canv->cv_color;
new->cv_drawmode = canv->cv_drawmode;
new->cv_font = canv->cv_font;
new->cv_font_fg_color = canv->cv_font_fg_color;
new->cv_font_bg_color = canv->cv_font_bg_color;
return new;
}
void gr_init_canvas(grs_canvas *canv, unsigned char * pixdata, int pixtype, int w, int h)
{
canv->cv_color = 0;
canv->cv_drawmode = 0;
canv->cv_font = NULL;
canv->cv_font_fg_color = 0;
canv->cv_font_bg_color = 0;
canv->cv_bitmap.bm_x = 0;
canv->cv_bitmap.bm_y = 0;
if (pixtype==BM_MODEX)
canv->cv_bitmap.bm_rowsize = w / 4;
else
canv->cv_bitmap.bm_rowsize = w;
canv->cv_bitmap.bm_w = w;
canv->cv_bitmap.bm_h = h;
canv->cv_bitmap.bm_flags = 0;
canv->cv_bitmap.bm_type = pixtype;
canv->cv_bitmap.bm_data = pixdata;
}
void gr_init_sub_canvas(grs_canvas *new, grs_canvas *src, int x, int y, int w, int h)
{
new->cv_color = src->cv_color;
new->cv_drawmode = src->cv_drawmode;
new->cv_font = src->cv_font;
new->cv_font_fg_color = src->cv_font_fg_color;
new->cv_font_bg_color = src->cv_font_bg_color;
new->cv_bitmap.bm_x = src->cv_bitmap.bm_x+x;
new->cv_bitmap.bm_y = src->cv_bitmap.bm_y+y;
new->cv_bitmap.bm_w = w;
new->cv_bitmap.bm_h = h;
new->cv_bitmap.bm_flags = 0;
new->cv_bitmap.bm_type = src->cv_bitmap.bm_type;
new->cv_bitmap.bm_rowsize = src->cv_bitmap.bm_rowsize;
new->cv_bitmap.bm_data = src->cv_bitmap.bm_data;
new->cv_bitmap.bm_data += y*src->cv_bitmap.bm_rowsize;
new->cv_bitmap.bm_data += x;
}
void gr_free_canvas(grs_canvas *canv)
{
free(canv->cv_bitmap.bm_data );
free(canv);
}
void gr_free_sub_canvas(grs_canvas *canv)
{
free(canv);
}
int gr_wait_for_retrace = 1;
void gr_show_canvas( grs_canvas *canv )
{
if (canv->cv_bitmap.bm_type == BM_MODEX )
gr_modex_setstart( canv->cv_bitmap.bm_x, canv->cv_bitmap.bm_y, gr_wait_for_retrace );
else if (canv->cv_bitmap.bm_type == BM_SVGA )
gr_vesa_setstart( canv->cv_bitmap.bm_x, canv->cv_bitmap.bm_y );
// else if (canv->cv_bitmap.bm_type == BM_LINEAR )
// Int3(); // Get JOHN!
//gr_linear_movsd( canv->cv_bitmap.bm_data, (void *)0xA0000, 320*200);
}
void gr_set_current_canvas( grs_canvas *canv )
{
if (canv==NULL)
grd_curcanv = &(grd_curscreen->sc_canvas);
else
grd_curcanv = canv;
if ( (grd_curcanv->cv_color >= 0) && (grd_curcanv->cv_color <= 255) ) {
gr_var_color = grd_curcanv->cv_color;
} else
gr_var_color = 0;
gr_var_bitmap = grd_curcanv->cv_bitmap.bm_data;
gr_var_bwidth = grd_curcanv->cv_bitmap.bm_rowsize;
}
void gr_clear_canvas(int color)
{
gr_setcolor(color);
gr_rect(0,0,WIDTH-1,HEIGHT-1);
}
void gr_setcolor(int color)
{
grd_curcanv->cv_color=color;
gr_var_color = color;
}