677 lines
16 KiB
C++
677 lines
16 KiB
C++
/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* Routines for bitblt's.
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*
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*/
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#include <string.h>
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#include "u_mem.h"
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#include "gr.h"
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#include "grdef.h"
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#include "rle.h"
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#include "dxxerror.h"
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#include "byteswap.h"
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#ifdef OGL
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#include "ogl_init.h"
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#endif
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static int gr_bitblt_dest_step_shift = 0;
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static int gr_bitblt_double = 0;
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static ubyte *gr_bitblt_fade_table=NULL;
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static void gr_bm_ubitblt00_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);
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static void gr_bm_ubitblt00m_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);
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static void gr_bm_ubitblt0x_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);
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static void gr_linear_movsd( ubyte * source, ubyte * dest, unsigned int nbytes) {
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memcpy(dest,source,nbytes);
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}
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static void gr_linear_rep_movsdm(ubyte *src, ubyte *dest, int num_pixels) {
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register ubyte c;
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while (num_pixels--)
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if ((c=*src++)!=255)
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*dest++=c;
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else dest++;
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}
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static void gr_linear_rep_movsdm_faded(ubyte * src, ubyte * dest, int num_pixels, ubyte fade_value ) {
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register ubyte c;
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while (num_pixels--)
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if ((c=*src++)!=255)
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*dest++=gr_fade_table[((int)fade_value<<8)|(int)c];
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else dest++;
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}
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static void gr_linear_rep_movsd_2x(ubyte * source, ubyte * dest, uint nbytes ) {
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register ubyte c;
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while (nbytes--) {
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if (nbytes&1)
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*dest++=*source++;
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else {
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unsigned short *sp=(unsigned short *)dest;
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c=*source++;
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*sp=((short)c<<8)|(short)c;
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dest+=2;
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}
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}
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}
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static void gr_ubitmap00( int x, int y, grs_bitmap *bm )
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{
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register int y1;
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int dest_rowsize;
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unsigned char * dest;
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unsigned char * src;
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dest_rowsize=grd_curcanv->cv_bitmap.bm_rowsize << gr_bitblt_dest_step_shift;
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dest = &(grd_curcanv->cv_bitmap.bm_data[ dest_rowsize*y+x ]);
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src = bm->bm_data;
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for (y1=0; y1 < bm->bm_h; y1++ ) {
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if (gr_bitblt_double)
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gr_linear_rep_movsd_2x( src, dest, bm->bm_w );
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else
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gr_linear_movsd( src, dest, bm->bm_w );
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src += bm->bm_rowsize;
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dest+= (int)(dest_rowsize);
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}
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}
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static void gr_ubitmap00m( int x, int y, grs_bitmap *bm )
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{
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register int y1;
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int dest_rowsize;
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unsigned char * dest;
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unsigned char * src;
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dest_rowsize=grd_curcanv->cv_bitmap.bm_rowsize << gr_bitblt_dest_step_shift;
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dest = &(grd_curcanv->cv_bitmap.bm_data[ dest_rowsize*y+x ]);
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src = bm->bm_data;
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if (gr_bitblt_fade_table==NULL) {
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for (y1=0; y1 < bm->bm_h; y1++ ) {
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gr_linear_rep_movsdm( src, dest, bm->bm_w );
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src += bm->bm_rowsize;
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dest+= (int)(dest_rowsize);
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}
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} else {
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for (y1=0; y1 < bm->bm_h; y1++ ) {
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gr_linear_rep_movsdm_faded( src, dest, bm->bm_w, gr_bitblt_fade_table[y1+y] );
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src += bm->bm_rowsize;
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dest+= (int)(dest_rowsize);
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}
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}
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}
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static void gr_ubitmap012( int x, int y, grs_bitmap *bm )
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{
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register int x1, y1;
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unsigned char * src;
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src = bm->bm_data;
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for (y1=y; y1 < (y+bm->bm_h); y1++ ) {
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for (x1=x; x1 < (x+bm->bm_w); x1++ ) {
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gr_setcolor( *src++ );
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gr_upixel( x1, y1 );
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}
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}
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}
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static void gr_ubitmap012m( int x, int y, grs_bitmap *bm )
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{
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register int x1, y1;
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unsigned char * src;
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src = bm->bm_data;
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for (y1=y; y1 < (y+bm->bm_h); y1++ ) {
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for (x1=x; x1 < (x+bm->bm_w); x1++ ) {
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if ( *src != 255 ) {
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gr_setcolor( *src );
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gr_upixel( x1, y1 );
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}
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src++;
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}
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}
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}
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static void gr_ubitmapGENERIC(int x, int y, grs_bitmap * bm)
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{
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register int x1, y1;
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for (y1=0; y1 < bm->bm_h; y1++ ) {
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for (x1=0; x1 < bm->bm_w; x1++ ) {
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gr_setcolor( gr_gpixel(bm,x1,y1) );
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gr_upixel( x+x1, y+y1 );
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}
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}
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}
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static void gr_ubitmapGENERICm(int x, int y, grs_bitmap * bm)
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{
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register int x1, y1;
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ubyte c;
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for (y1=0; y1 < bm->bm_h; y1++ ) {
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for (x1=0; x1 < bm->bm_w; x1++ ) {
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c = gr_gpixel(bm,x1,y1);
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if ( c != 255 ) {
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gr_setcolor( c );
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gr_upixel( x+x1, y+y1 );
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}
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}
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}
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}
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void gr_ubitmap( int x, int y, grs_bitmap *bm )
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{ int source, dest;
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source = bm->bm_type;
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dest = TYPE;
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if (source==BM_LINEAR) {
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switch( dest )
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{
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case BM_LINEAR:
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if ( bm->bm_flags & BM_FLAG_RLE )
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gr_bm_ubitblt00_rle(bm->bm_w, bm->bm_h, x, y, 0, 0, bm, &grd_curcanv->cv_bitmap );
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else
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gr_ubitmap00( x, y, bm );
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return;
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#ifdef OGL
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case BM_OGL:
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ogl_ubitmapm_cs(x,y,-1,-1,bm,-1,F1_0);
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return;
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#endif
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default:
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gr_ubitmap012( x, y, bm );
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return;
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}
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} else {
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gr_ubitmapGENERIC(x, y, bm);
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}
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}
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void gr_ubitmapm( int x, int y, grs_bitmap *bm )
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{ int source, dest;
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source = bm->bm_type;
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dest = TYPE;
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if (source==BM_LINEAR) {
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switch( dest )
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{
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case BM_LINEAR:
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if ( bm->bm_flags & BM_FLAG_RLE )
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gr_bm_ubitblt00m_rle(bm->bm_w, bm->bm_h, x, y, 0, 0, bm, &grd_curcanv->cv_bitmap );
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else
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gr_ubitmap00m( x, y, bm );
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return;
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#ifdef OGL
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case BM_OGL:
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ogl_ubitmapm_cs(x,y,-1,-1,bm,-1,F1_0);
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return;
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#endif
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default:
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gr_ubitmap012m( x, y, bm );
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return;
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}
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} else {
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gr_ubitmapGENERICm(x, y, bm);
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}
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}
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// From Linear to Linear
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static void gr_bm_ubitblt00(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
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{
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unsigned char * dbits;
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unsigned char * sbits;
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//int src_bm_rowsize_2, dest_bm_rowsize_2;
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int dstep;
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int i;
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sbits = src->bm_data + (src->bm_rowsize * sy) + sx;
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dbits = dest->bm_data + (dest->bm_rowsize * dy) + dx;
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dstep = dest->bm_rowsize << gr_bitblt_dest_step_shift;
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// No interlacing, copy the whole buffer.
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if (gr_bitblt_double)
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for (i=0; i < h; i++ ) {
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gr_linear_rep_movsd_2x( sbits, dbits, w );
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sbits += src->bm_rowsize;
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dbits += dstep;
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}
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else
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for (i=0; i < h; i++ ) {
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gr_linear_movsd( sbits, dbits, w );
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//memcpy(dbits, sbits, w);
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sbits += src->bm_rowsize;
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dbits += dstep;
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}
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}
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// From Linear to Linear Masked
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static void gr_bm_ubitblt00m(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
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{
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unsigned char * dbits;
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unsigned char * sbits;
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//int src_bm_rowsize_2, dest_bm_rowsize_2;
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int i;
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sbits = src->bm_data + (src->bm_rowsize * sy) + sx;
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dbits = dest->bm_data + (dest->bm_rowsize * dy) + dx;
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// No interlacing, copy the whole buffer.
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if (gr_bitblt_fade_table==NULL) {
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for (i=0; i < h; i++ ) {
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gr_linear_rep_movsdm( sbits, dbits, w );
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sbits += src->bm_rowsize;
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dbits += dest->bm_rowsize;
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}
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} else {
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for (i=0; i < h; i++ ) {
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gr_linear_rep_movsdm_faded( sbits, dbits, w, gr_bitblt_fade_table[dy+i] );
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sbits += src->bm_rowsize;
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dbits += dest->bm_rowsize;
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}
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}
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}
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void gr_bm_bitblt(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
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{
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int dx1=dx, dx2=dx+dest->bm_w-1;
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int dy1=dy, dy2=dy+dest->bm_h-1;
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int sx1=sx, sx2=sx+src->bm_w-1;
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int sy1=sy, sy2=sy+src->bm_h-1;
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if ((dx1 >= dest->bm_w ) || (dx2 < 0)) return;
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if ((dy1 >= dest->bm_h ) || (dy2 < 0)) return;
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if ( dx1 < 0 ) { sx1 += -dx1; dx1 = 0; }
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if ( dy1 < 0 ) { sy1 += -dy1; dy1 = 0; }
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if ( dx2 >= dest->bm_w ) { dx2 = dest->bm_w-1; }
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if ( dy2 >= dest->bm_h ) { dy2 = dest->bm_h-1; }
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if ((sx1 >= src->bm_w ) || (sx2 < 0)) return;
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if ((sy1 >= src->bm_h ) || (sy2 < 0)) return;
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if ( sx1 < 0 ) { dx1 += -sx1; sx1 = 0; }
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if ( sy1 < 0 ) { dy1 += -sy1; sy1 = 0; }
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if ( sx2 >= src->bm_w ) { sx2 = src->bm_w-1; }
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if ( sy2 >= src->bm_h ) { sy2 = src->bm_h-1; }
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// Draw bitmap bm[x,y] into (dx1,dy1)-(dx2,dy2)
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if ( dx2-dx1+1 < w )
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w = dx2-dx1+1;
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if ( dy2-dy1+1 < h )
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h = dy2-dy1+1;
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if ( sx2-sx1+1 < w )
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w = sx2-sx1+1;
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if ( sy2-sy1+1 < h )
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h = sy2-sy1+1;
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gr_bm_ubitblt(w,h, dx1, dy1, sx1, sy1, src, dest );
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}
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void gr_bm_ubitblt(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
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{
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register int x1, y1;
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if ( (src->bm_type == BM_LINEAR) && (dest->bm_type == BM_LINEAR ))
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{
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if ( src->bm_flags & BM_FLAG_RLE )
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gr_bm_ubitblt00_rle( w, h, dx, dy, sx, sy, src, dest );
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else
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gr_bm_ubitblt00( w, h, dx, dy, sx, sy, src, dest );
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return;
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}
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#ifdef OGL
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if ( (src->bm_type == BM_LINEAR) && (dest->bm_type == BM_OGL ))
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{
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ogl_ubitblt(w, h, dx, dy, sx, sy, src, dest);
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return;
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}
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if ( (src->bm_type == BM_OGL) && (dest->bm_type == BM_LINEAR ))
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{
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return;
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}
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if ( (src->bm_type == BM_OGL) && (dest->bm_type == BM_OGL ))
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{
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return;
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}
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#endif
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if ( (src->bm_flags & BM_FLAG_RLE ) && (src->bm_type == BM_LINEAR) ) {
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gr_bm_ubitblt0x_rle(w, h, dx, dy, sx, sy, src, dest);
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return;
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}
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for (y1=0; y1 < h; y1++ ) {
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for (x1=0; x1 < w; x1++ ) {
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gr_bm_pixel( dest, dx+x1, dy+y1, gr_gpixel(src,sx+x1,sy+y1) );
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}
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}
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}
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// Clipped bitmap ...
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void gr_bitmap( int x, int y, grs_bitmap *bm )
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{
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int dx1=x, dx2=x+bm->bm_w-1;
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int dy1=y, dy2=y+bm->bm_h-1;
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#ifndef OGL
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int sx=0, sy=0;
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#endif
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if ((dx1 >= grd_curcanv->cv_bitmap.bm_w ) || (dx2 < 0)) return;
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if ((dy1 >= grd_curcanv->cv_bitmap.bm_h) || (dy2 < 0)) return;
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// Draw bitmap bm[x,y] into (dx1,dy1)-(dx2,dy2)
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#ifdef OGL
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ogl_ubitmapm_cs(x, y, 0, 0, bm, -1, F1_0);
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#else
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if ( dx1 < 0 )
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{
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sx = -dx1;
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dx1 = 0;
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}
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if ( dy1 < 0 )
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{
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sy = -dy1;
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dy1 = 0;
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}
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if ( dx2 >= grd_curcanv->cv_bitmap.bm_w ) { dx2 = grd_curcanv->cv_bitmap.bm_w-1; }
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if ( dy2 >= grd_curcanv->cv_bitmap.bm_h ) { dy2 = grd_curcanv->cv_bitmap.bm_h-1; }
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gr_bm_ubitblt(dx2-dx1+1,dy2-dy1+1, dx1, dy1, sx, sy, bm, &grd_curcanv->cv_bitmap );
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#endif
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}
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void gr_bitmapm( int x, int y, grs_bitmap *bm )
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{
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int dx1=x, dx2=x+bm->bm_w-1;
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int dy1=y, dy2=y+bm->bm_h-1;
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int sx=0, sy=0;
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if ((dx1 >= grd_curcanv->cv_bitmap.bm_w ) || (dx2 < 0)) return;
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if ((dy1 >= grd_curcanv->cv_bitmap.bm_h) || (dy2 < 0)) return;
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if ( dx1 < 0 ) { sx = -dx1; dx1 = 0; }
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if ( dy1 < 0 ) { sy = -dy1; dy1 = 0; }
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if ( dx2 >= grd_curcanv->cv_bitmap.bm_w ) { dx2 = grd_curcanv->cv_bitmap.bm_w-1; }
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if ( dy2 >= grd_curcanv->cv_bitmap.bm_h ) { dy2 = grd_curcanv->cv_bitmap.bm_h-1; }
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// Draw bitmap bm[x,y] into (dx1,dy1)-(dx2,dy2)
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if ( (bm->bm_type == BM_LINEAR) && (grd_curcanv->cv_bitmap.bm_type == BM_LINEAR ))
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{
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if ( bm->bm_flags & BM_FLAG_RLE )
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gr_bm_ubitblt00m_rle(dx2-dx1+1,dy2-dy1+1, dx1, dy1, sx, sy, bm, &grd_curcanv->cv_bitmap );
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else
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gr_bm_ubitblt00m(dx2-dx1+1,dy2-dy1+1, dx1, dy1, sx, sy, bm, &grd_curcanv->cv_bitmap );
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return;
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}
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gr_bm_ubitbltm(dx2-dx1+1,dy2-dy1+1, dx1, dy1, sx, sy, bm, &grd_curcanv->cv_bitmap );
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}
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void gr_bm_ubitbltm(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
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{
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register int x1, y1;
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ubyte c;
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#ifdef OGL
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if ( (src->bm_type == BM_LINEAR) && (dest->bm_type == BM_OGL ))
|
|
{
|
|
ogl_ubitblt(w, h, dx, dy, sx, sy, src, dest);
|
|
return;
|
|
}
|
|
if ( (src->bm_type == BM_OGL) && (dest->bm_type == BM_LINEAR ))
|
|
{
|
|
return;
|
|
}
|
|
if ( (src->bm_type == BM_OGL) && (dest->bm_type == BM_OGL ))
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
for (y1=0; y1 < h; y1++ ) {
|
|
for (x1=0; x1 < w; x1++ ) {
|
|
if ((c=gr_gpixel(src,sx+x1,sy+y1))!=255)
|
|
gr_bm_pixel( dest, dx+x1, dy+y1,c );
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
static void gr_bm_ubitblt00_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
|
|
{
|
|
unsigned char * dbits;
|
|
unsigned char * sbits;
|
|
int i, data_offset;
|
|
|
|
data_offset = 1;
|
|
if (src->bm_flags & BM_FLAG_RLE_BIG)
|
|
data_offset = 2;
|
|
|
|
sbits = &src->bm_data[4 + (src->bm_h*data_offset)];
|
|
|
|
for (i=0; i<sy; i++ )
|
|
sbits += (int)(INTEL_SHORT(src->bm_data[4+(i*data_offset)]));
|
|
|
|
dbits = dest->bm_data + (dest->bm_rowsize * dy) + dx;
|
|
|
|
// No interlacing, copy the whole buffer.
|
|
for (i=0; i < h; i++ ) {
|
|
gr_rle_expand_scanline( dbits, sbits, sx, sx+w-1 );
|
|
if ( src->bm_flags & BM_FLAG_RLE_BIG )
|
|
sbits += (int)INTEL_SHORT(*((short *)&(src->bm_data[4+((i+sy)*data_offset)])));
|
|
else
|
|
sbits += (int)(src->bm_data[4+i+sy]);
|
|
dbits += dest->bm_rowsize << gr_bitblt_dest_step_shift;
|
|
}
|
|
}
|
|
|
|
static void gr_bm_ubitblt00m_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest)
|
|
{
|
|
unsigned char * dbits;
|
|
unsigned char * sbits;
|
|
int i, data_offset;
|
|
|
|
data_offset = 1;
|
|
if (src->bm_flags & BM_FLAG_RLE_BIG)
|
|
data_offset = 2;
|
|
|
|
sbits = &src->bm_data[4 + (src->bm_h*data_offset)];
|
|
for (i=0; i<sy; i++ )
|
|
sbits += (int)(INTEL_SHORT(src->bm_data[4+(i*data_offset)]));
|
|
|
|
dbits = dest->bm_data + (dest->bm_rowsize * dy) + dx;
|
|
|
|
// No interlacing, copy the whole buffer.
|
|
for (i=0; i < h; i++ ) {
|
|
gr_rle_expand_scanline_masked( dbits, sbits, sx, sx+w-1 );
|
|
if ( src->bm_flags & BM_FLAG_RLE_BIG )
|
|
sbits += (int)INTEL_SHORT(*((short *)&(src->bm_data[4+((i+sy)*data_offset)])));
|
|
else
|
|
sbits += (int)(src->bm_data[4+i+sy]);
|
|
dbits += dest->bm_rowsize << gr_bitblt_dest_step_shift;
|
|
}
|
|
}
|
|
|
|
// in rle.c
|
|
|
|
|
|
static void gr_bm_ubitblt0x_rle(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src,
|
|
grs_bitmap * dest)
|
|
{
|
|
int i, data_offset;
|
|
register int y1;
|
|
unsigned char * sbits;
|
|
|
|
data_offset = 1;
|
|
if (src->bm_flags & BM_FLAG_RLE_BIG)
|
|
data_offset = 2;
|
|
|
|
sbits = &src->bm_data[4 + (src->bm_h*data_offset)];
|
|
for (i=0; i<sy; i++ )
|
|
sbits += (int)(INTEL_SHORT(src->bm_data[4+(i*data_offset)]));
|
|
|
|
for (y1=0; y1 < h; y1++ ) {
|
|
gr_rle_expand_scanline_generic( dest, dx, dy+y1, sbits, sx, sx+w-1);
|
|
if ( src->bm_flags & BM_FLAG_RLE_BIG )
|
|
sbits += (int)INTEL_SHORT(*((short *)&(src->bm_data[4+((y1+sy)*data_offset)])));
|
|
else
|
|
sbits += (int)src->bm_data[4+y1+sy];
|
|
}
|
|
}
|
|
|
|
// rescalling bitmaps, 10/14/99 Jan Bobrowski jb@wizard.ae.krakow.pl
|
|
|
|
static inline void scale_line(unsigned char *in, unsigned char *out, int ilen, int olen)
|
|
{
|
|
int a = olen/ilen, b = olen%ilen;
|
|
int c = 0, i;
|
|
unsigned char *end = out + olen;
|
|
while(out<end) {
|
|
i = a;
|
|
c += b;
|
|
if(c >= ilen) {
|
|
c -= ilen;
|
|
goto inside;
|
|
}
|
|
while(--i>=0) {
|
|
inside:
|
|
*out++ = *in;
|
|
}
|
|
in++;
|
|
}
|
|
}
|
|
|
|
static void gr_bitmap_scale_to(grs_bitmap *src, grs_bitmap *dst)
|
|
{
|
|
unsigned char *s = src->bm_data;
|
|
unsigned char *d = dst->bm_data;
|
|
int h = src->bm_h;
|
|
int a = dst->bm_h/h, b = dst->bm_h%h;
|
|
int c = 0, i, y;
|
|
|
|
for(y=0; y<h; y++) {
|
|
i = a;
|
|
c += b;
|
|
if(c >= h) {
|
|
c -= h;
|
|
goto inside;
|
|
}
|
|
while(--i>=0) {
|
|
inside:
|
|
scale_line(s, d, src->bm_w, dst->bm_w);
|
|
d += dst->bm_rowsize;
|
|
}
|
|
s += src->bm_rowsize;
|
|
}
|
|
}
|
|
|
|
void show_fullscr(grs_bitmap *bm)
|
|
{
|
|
grs_bitmap * const scr = &grd_curcanv->cv_bitmap;
|
|
|
|
#ifdef OGL
|
|
if(bm->bm_type == BM_LINEAR && scr->bm_type == BM_OGL &&
|
|
bm->bm_w <= grd_curscreen->sc_w && bm->bm_h <= grd_curscreen->sc_h) // only scale with OGL if bitmap is not bigger than screen size
|
|
{
|
|
ogl_ubitmapm_cs(0,0,-1,-1,bm,-1,F1_0);//use opengl to scale, faster and saves ram. -MPM
|
|
return;
|
|
}
|
|
#endif
|
|
if(scr->bm_type != BM_LINEAR) {
|
|
grs_bitmap *tmp = gr_create_bitmap(scr->bm_w, scr->bm_h);
|
|
gr_bitmap_scale_to(bm, tmp);
|
|
gr_bitmap(0, 0, tmp);
|
|
gr_free_bitmap(tmp);
|
|
return;
|
|
}
|
|
gr_bitmap_scale_to(bm, scr);
|
|
}
|
|
|
|
// Find transparent area in bitmap
|
|
void gr_bitblt_find_transparent_area(grs_bitmap *bm, int *minx, int *miny, int *maxx, int *maxy)
|
|
{
|
|
ubyte c;
|
|
int i = 0, x = 0, y = 0, count = 0;
|
|
static unsigned char buf[1024*1024];
|
|
|
|
if (!(bm->bm_flags&BM_FLAG_TRANSPARENT))
|
|
return;
|
|
|
|
memset(buf,0,1024*1024);
|
|
|
|
*minx = bm->bm_w - 1;
|
|
*maxx = 0;
|
|
*miny = bm->bm_h - 1;
|
|
*maxy = 0;
|
|
|
|
// decode the bitmap
|
|
if (bm->bm_flags & BM_FLAG_RLE){
|
|
unsigned char * dbits;
|
|
unsigned char * sbits;
|
|
int i, data_offset;
|
|
|
|
data_offset = 1;
|
|
if (bm->bm_flags & BM_FLAG_RLE_BIG)
|
|
data_offset = 2;
|
|
|
|
sbits = &bm->bm_data[4 + (bm->bm_h * data_offset)];
|
|
dbits = buf;
|
|
|
|
for (i=0; i < bm->bm_h; i++ ) {
|
|
gr_rle_decode(sbits,dbits);
|
|
if ( bm->bm_flags & BM_FLAG_RLE_BIG )
|
|
sbits += (int)INTEL_SHORT(*((short *)&(bm->bm_data[4+(i*data_offset)])));
|
|
else
|
|
sbits += (int)bm->bm_data[4+i];
|
|
dbits += bm->bm_w;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
memcpy(&buf, bm->bm_data, sizeof(unsigned char)*(bm->bm_w*bm->bm_h));
|
|
}
|
|
|
|
for (y = 0; y < bm->bm_h; y++) {
|
|
for (x = 0; x < bm->bm_w; x++) {
|
|
c = buf[i++];
|
|
if (c == TRANSPARENCY_COLOR) { // don't look for transparancy color here.
|
|
count++;
|
|
if (x < *minx) *minx = x;
|
|
if (y < *miny) *miny = y;
|
|
if (x > *maxx) *maxx = x;
|
|
if (y > *maxy) *maxy = y;
|
|
}
|
|
}
|
|
}
|
|
Assert (count);
|
|
}
|