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dxx-rebirth/2d/ibitblt.c
md2211 a0b4cac982 * Removed executable flag on most files 
* Reverted value of SOUND_MAX_VOLUME
2007-09-21 19:06:05 +00:00

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/* $Id: ibitblt.c,v 1.1.1.1 2006/03/17 19:52:02 zicodxx Exp $ */
/*
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 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
*/
/*
*
* "PC" Version:
* Rountines to copy a bitmap on top of another bitmap, but
* only copying to pixels that are transparent.
* "Mac" Version:
* Routines to to inverse bitblitting -- well not really.
* We don't inverse bitblt like in the PC, but this code
* does set up a structure that blits around the cockpit
*
* d2x uses the "Mac" version for everything except __MSDOS__
*
*/
#ifdef HAVE_CONFIG_H
#include <conf.h>
#endif
#ifdef RCS
static char rcsid[] = "$Id: ibitblt.c,v 1.1.1.1 2006/03/17 19:52:02 zicodxx Exp $";
#endif
#ifdef __MSDOS__ //ndef MACINTOSH
#include <conio.h>
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "gr.h"
#include "mem.h"
#include "error.h"
#include "ibitblt.h"
#include "grdef.h"
#define MODE_NONE 0
#define MODE_SKIP 1
#define MODE_DRAW 2
#define OPCODE_ADD 0x81
#define OPCODE_ESI 0xC6 // Followed by a dword (add esi, ????)
#define OPCODE_EDI 0xC7 // Followed by a dword (add edi, ????)
#define OPCODE_MOV_ECX 0xB9 // Followed by a dword (mov ecx,????)
#define OPCODE_MOVSB 0xA4 // movsb
#define OPCODE_16BIT 0x66 // movsw
#define OPCODE_MOVSD 0xA5 // movsd
#define OPCODE_REP 0xF3 // rep
#define OPCODE_RET 0xC3 // ret
#define OPCODE_MOV_EAX 0xB8 // mov eax, im dword
#define OPCODE_MOV_EBX 0xBB // mov ebx, im dword
#define OPCODE_CALL_EBX1 0xFF // call
#define OPCODE_CALL_EBX2 0xD3 // ebx
#define OPCODE_MOV_EDI 0xBF // mov edi, im dword
ubyte *Code_pointer = NULL;
int Code_counter = 0;
int ibitblt_svga_page = 0;
int is_svga = 0;
uint linear_address;
void count_block( int ecx )
{
int blocks;
while ( ecx > 0 ) {
switch(ecx) {
case 1: Code_counter++; ecx = 0; break; // MOVSB
case 2: Code_counter+=2; ecx = 0; break; // MOVSW
case 3: Code_counter+=3; ecx = 0; break; // MOVSW, MOVSB
case 4: Code_counter++; ecx = 0; break; // MOVSD
default:
blocks = ecx / 4;
if ( blocks == 1 )
Code_counter++; // MOVSD
else
Code_counter+=7;
ecx -= blocks*4;
}
}
}
void move_and_count( int dsource, int ddest, int ecx )
{
if ( ecx <= 0 )
return;
if ( dsource > 0 ) {
// ADD ESI, dsource
Code_counter += 6;
}
if ( !is_svga ) {
if ( ddest > 0 ) {
// ADD EDI, ddest
Code_counter += 6;
}
count_block( ecx );
} else {
int p1, p2, o1;
linear_address += ddest; // Skip to next block
p1 = linear_address >> 16; o1 = linear_address & 0xFFFF;
p2 = (linear_address+ecx) >> 16;
if ( p1 != ibitblt_svga_page ) {
// Set page
// MOV EAX, ?, CALL EBX
Code_counter += 7;
ibitblt_svga_page = p1;
}
Code_counter += 5; // mov edi, ????
if ( p1 == p2 ) {
count_block( ecx );
} else {
int nbytes;
nbytes = 0xFFFF-o1+1;
count_block( nbytes );
// set page
// MOV EAX, 0
Code_counter += 7; // mov eax,???? call ebx
ibitblt_svga_page = p2;
Code_counter += 5; // mov edi, ????
nbytes = ecx - nbytes;
if (nbytes > 0 )
count_block( nbytes );
}
linear_address += ecx;
}
}
void draw_block( int ecx )
{
int blocks;
int * iptr;
while ( ecx > 0 ) {
switch( ecx ) {
case 1:
// MOVSB
*Code_pointer++ = OPCODE_MOVSB;
ecx = 0;
break;
case 2:
// MOVSW
*Code_pointer++ = OPCODE_16BIT;
*Code_pointer++ = OPCODE_MOVSD;
ecx = 0;
break;
case 3:
// MOVSW, MOVSB
*Code_pointer++ = OPCODE_16BIT;
*Code_pointer++ = OPCODE_MOVSD;
*Code_pointer++ = OPCODE_MOVSB;
ecx = 0;
break;
case 4:
// MOVSD
*Code_pointer++ = OPCODE_MOVSD;
ecx = 0;
break;
default:
blocks = ecx / 4;
if ( blocks == 1 ) {
// MOVSD
*Code_pointer++ = OPCODE_MOVSD;
} else {
// MOV ECX, blocks
*Code_pointer++ = OPCODE_MOV_ECX;
iptr = (int *)Code_pointer;
*iptr++ = blocks;
Code_pointer = (ubyte *)iptr;
// REP MOVSD
*Code_pointer++ = OPCODE_REP;
*Code_pointer++ = OPCODE_MOVSD;
}
ecx -= blocks*4;
}
}
}
void move_and_draw( int dsource, int ddest, int ecx )
{
int * iptr;
if ( ecx <= 0 )
return;
if ( dsource > 0 ) {
// ADD ESI, dsource
*Code_pointer++ = OPCODE_ADD;
*Code_pointer++ = OPCODE_ESI;
iptr = (int *)Code_pointer;
*iptr++ = dsource;
Code_pointer = (ubyte *)iptr;
}
if ( !is_svga ) {
if ( ddest > 0 ) {
// ADD EDI, ddest
*Code_pointer++ = OPCODE_ADD;
*Code_pointer++ = OPCODE_EDI;
iptr = (int *)Code_pointer;
*iptr++ = ddest;
Code_pointer = (ubyte *)iptr;
}
draw_block( ecx );
} else {
unsigned int temp;
int temp_offset;
int p1, p2, o1;
linear_address += ddest; // Skip to next block
p1 = linear_address >> 16; o1 = linear_address & 0xFFFF;
p2 = (linear_address+ecx) >> 16;
if ( p1 != ibitblt_svga_page ) {
// Set page
// MOV EAX, 0
*Code_pointer++ = OPCODE_MOV_EAX;
temp = p1;
memcpy( Code_pointer, &temp, sizeof(int) );
Code_pointer += sizeof(int);
// CALL EBX
*Code_pointer++ = OPCODE_CALL_EBX1;
*Code_pointer++ = OPCODE_CALL_EBX2;
ibitblt_svga_page = p1;
}
temp_offset = 0xA0000 + o1;
*Code_pointer++ = OPCODE_MOV_EDI;
iptr = (int *)Code_pointer;
*iptr++ = temp_offset;
Code_pointer = (ubyte *)iptr;
if ( p1 == p2 ) {
draw_block( ecx );
} else {
int nbytes;
nbytes = 0xFFFF-o1+1;
draw_block( nbytes );
// set page
// MOV EAX, 0
*Code_pointer++ = OPCODE_MOV_EAX;
temp = p2;
memcpy( Code_pointer, &temp, sizeof(int) );
Code_pointer += sizeof(int);
// CALL EBX
*Code_pointer++ = OPCODE_CALL_EBX1;
*Code_pointer++ = OPCODE_CALL_EBX2;
ibitblt_svga_page = p2;
temp_offset = 0xA0000;
*Code_pointer++ = OPCODE_MOV_EDI;
iptr = (int *)Code_pointer;
*iptr++ = temp_offset;
Code_pointer = (ubyte *)iptr;
nbytes = ecx - nbytes;
if (nbytes > 0 )
draw_block( nbytes );
}
linear_address += ecx;
}
}
//-----------------------------------------------------------------------------------------
// Given bitmap, bmp, finds the size of the code
int gr_ibitblt_find_code_size_sub( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize, int dest_type )
{
int x,y;
ubyte pixel;
int draw_mode = MODE_NONE;
int source_offset = 0;
int dest_offset = 0;
int num_to_draw, draw_start_source, draw_start_dest;
int esi, edi;
Assert( (!(mask_bmp->bm_flags&BM_FLAG_RLE)) );
Code_counter = 0;
if ( dest_type == BM_SVGA ) {
Code_counter += 1+4; // move ebx, gr_vesa_set_page
Code_counter += 1+4; // move eax, 0
Code_counter += 2; // call ebx
ibitblt_svga_page = 0;
linear_address = 0;
is_svga = 1;
} else {
is_svga = 0;
}
esi = source_offset = 0;
edi = dest_offset = 0;
draw_start_source = draw_start_dest = 0;
for ( y=sy; y<sy+sh; y++ ) {
for ( x=sx; x<sx+sw; x++ ) {
dest_offset = y*mask_bmp->bm_rowsize+x;
pixel = mask_bmp->bm_data[dest_offset];
if ( pixel!=255 ) {
switch ( draw_mode) {
case MODE_DRAW:
move_and_count( draw_start_source-esi, draw_start_dest-edi, num_to_draw );
esi = draw_start_source + num_to_draw;
edi = draw_start_dest + num_to_draw;
// fall through!!!
case MODE_NONE:
case MODE_SKIP:
break;
}
draw_mode = MODE_SKIP;
} else {
switch ( draw_mode) {
case MODE_SKIP:
case MODE_NONE:
draw_start_source = source_offset;
draw_start_dest = dest_offset;
num_to_draw = 0;
// fall through
case MODE_DRAW:
num_to_draw++;
break;
}
draw_mode = MODE_DRAW;
}
source_offset++;
}
if ( draw_mode == MODE_DRAW ) {
move_and_count( draw_start_source-esi, draw_start_dest-edi, num_to_draw );
esi = draw_start_source + num_to_draw;
edi = draw_start_dest + num_to_draw;
}
draw_mode = MODE_NONE;
source_offset += (srowsize - sw);
}
Code_counter++; // for return
//printf( "Code will be %d bytes\n", Code_counter );
Code_counter += 16; // for safety was 16
return Code_counter;
}
int gr_ibitblt_find_code_size( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize )
{
return gr_ibitblt_find_code_size_sub( mask_bmp, sx, sy, sw, sh, srowsize, BM_LINEAR );
}
int gr_ibitblt_find_code_size_svga( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize )
{
return gr_ibitblt_find_code_size_sub( mask_bmp, sx, sy, sw, sh, srowsize, BM_SVGA );
}
//-----------------------------------------------------------------------------------------
// Given bitmap, bmp, create code that transfers a bitmap of size sw*sh to position
// (sx,sy) on top of bmp, only overwritting transparent pixels of the bitmap.
ubyte *gr_ibitblt_create_mask_sub( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize, int dest_type )
{
int x,y;
ubyte pixel;
int draw_mode = MODE_NONE;
int source_offset = 0;
int dest_offset = 0;
int num_to_draw, draw_start_source, draw_start_dest;
int esi, edi;
int code_size;
ubyte *code;
uint temp;
Assert( (!(mask_bmp->bm_flags&BM_FLAG_RLE)) );
if ( dest_type == BM_SVGA )
code_size = gr_ibitblt_find_code_size_svga( mask_bmp, sx, sy, sw, sh, srowsize );
else
code_size = gr_ibitblt_find_code_size( mask_bmp, sx, sy, sw, sh, srowsize );
code = malloc( code_size );
if ( code == NULL )
return NULL;
Code_pointer = code;
if ( dest_type == BM_SVGA ) {
// MOV EBX, gr_vesa_setpage
*Code_pointer++ = OPCODE_MOV_EBX;
temp = (uint)gr_vesa_setpage;
memcpy( Code_pointer, &temp, sizeof(int) );
Code_pointer += sizeof(int);
// MOV EAX, 0
*Code_pointer++ = OPCODE_MOV_EAX;
temp = 0;
memcpy( Code_pointer, &temp, sizeof(int) );
Code_pointer += sizeof(int);
// CALL EBX
*Code_pointer++ = OPCODE_CALL_EBX1;
*Code_pointer++ = OPCODE_CALL_EBX2;
ibitblt_svga_page = 0;
is_svga = 1;
linear_address = 0;
} else {
is_svga = 0;
}
esi = source_offset = 0;
edi = dest_offset = 0;
draw_start_source = draw_start_dest = 0;
for ( y=sy; y<sy+sh; y++ ) {
for ( x=sx; x<sx+sw; x++ ) {
dest_offset = y*mask_bmp->bm_rowsize+x;
pixel = mask_bmp->bm_data[dest_offset];
if ( pixel!=255 ) {
switch ( draw_mode) {
case MODE_DRAW:
move_and_draw( draw_start_source-esi, draw_start_dest-edi, num_to_draw );
esi = draw_start_source + num_to_draw;
edi = draw_start_dest + num_to_draw;
// fall through!!!
case MODE_NONE:
case MODE_SKIP:
break;
}
draw_mode = MODE_SKIP;
} else {
switch ( draw_mode) {
case MODE_SKIP:
case MODE_NONE:
draw_start_source = source_offset;
draw_start_dest = dest_offset;
num_to_draw = 0;
// fall through
case MODE_DRAW:
num_to_draw++;
break;
}
draw_mode = MODE_DRAW;
}
source_offset++;
}
if ( draw_mode == MODE_DRAW ) {
move_and_draw( draw_start_source-esi, draw_start_dest-edi, num_to_draw );
esi = draw_start_source + num_to_draw;
edi = draw_start_dest + num_to_draw;
}
draw_mode = MODE_NONE;
source_offset += (srowsize - sw);
}
*Code_pointer++ = OPCODE_RET;
if ( Code_pointer >= &code[code_size-1] )
Error( "ibitblt overwrote allocated code block\n" );
//printf( "Code is %d bytes\n", Code_pointer - code );
return code;
}
ubyte *gr_ibitblt_create_mask( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize )
{
return gr_ibitblt_create_mask_sub( mask_bmp, sx, sy, sw, sh, srowsize, BM_LINEAR );
}
ubyte *gr_ibitblt_create_mask_svga( grs_bitmap * mask_bmp, int sx, int sy, int sw, int sh, int srowsize )
{
return gr_ibitblt_create_mask_sub( mask_bmp, sx, sy, sw, sh, srowsize, BM_SVGA );
}
void gr_ibitblt_do_asm(char *start_si, char *start_di, ubyte * code);
#pragma aux gr_ibitblt_do_asm parm [esi] [edi] [eax] modify [ecx edi esi eax] = \
"pusha" \
"cld" \
"call eax" \
"popa"
void gr_ibitblt(grs_bitmap * source_bmp, grs_bitmap * dest_bmp, ubyte * mask )
{
if (mask != NULL )
gr_ibitblt_do_asm( source_bmp->bm_data, dest_bmp->bm_data, mask );
}
void gr_ibitblt_find_hole_size( grs_bitmap * mask_bmp, int *minx, int *miny, int *maxx, int *maxy )
{
int x, y, count=0;
ubyte c;
Assert( (!(mask_bmp->bm_flags&BM_FLAG_RLE)) );
*minx = mask_bmp->bm_w-1;
*maxx = 0;
*miny = mask_bmp->bm_h-1;
*maxy = 0;
for ( y=0; y<mask_bmp->bm_h; y++ )
for ( x=0; x<mask_bmp->bm_w; x++ ) {
c = mask_bmp->bm_data[mask_bmp->bm_rowsize*y+x];
if (c == 255 ) {
if ( x < *minx ) *minx = x;
if ( y < *miny ) *miny = y;
if ( x > *maxx ) *maxx = x;
if ( y > *maxy ) *maxy = y;
count++;
}
}
if ( count == 0 ) {
Error( "Bitmap for ibitblt doesn't have transparency!\n" );
}
}
#else /* __MSDOS__ */ // was: /* !MACINTOSH */
#include "pstypes.h"
#include "gr.h"
#include "ibitblt.h"
#include "error.h"
#include "u_mem.h"
#include "grdef.h"
#define FIND_START 1
#define FIND_STOP 2
#define MAX_WIDTH 640
#define MAX_SCANLINES 480
#define MAX_HOLES 5
static short start_points[MAX_SCANLINES][MAX_HOLES];
static short hole_length[MAX_SCANLINES][MAX_HOLES];
static double *scanline = NULL;
void gr_ibitblt(grs_bitmap *src_bmp, grs_bitmap *dest_bmp)
{
int x, y, sw, sh, srowsize, drowsize, dstart, sy;
ubyte *src, *dest;
// variable setup
sw = src_bmp->bm_w;
sh = src_bmp->bm_h;
srowsize = src_bmp->bm_rowsize;
drowsize = dest_bmp->bm_rowsize;
src = src_bmp->bm_data;
dest = dest_bmp->bm_data;
sy = 0;
while (start_points[sy][0] == -1) {
sy++;
dest += drowsize;
}
Assert(sw <= MAX_WIDTH);
Assert(sh <= MAX_SCANLINES);
for (y = sy; y < sy + sh; y++) {
for (x = 0; x < MAX_HOLES; x++) {
if (start_points[y][x] == -1)
break;
dstart = start_points[y][x];
gr_linear_movsd(&(src[dstart]), &(dest[dstart]), hole_length[y][x]);
}
dest += drowsize;
src += srowsize;
}
}
void gr_ibitblt_create_mask(grs_bitmap *mask_bmp, int sx, int sy, int sw, int sh, int srowsize)
{
int x, y;
ubyte mode;
int count = 0;
Assert( (!(mask_bmp->bm_flags&BM_FLAG_RLE)) );
for (y = 0; y < MAX_SCANLINES; y++) {
for (x = 0; x < MAX_HOLES; x++) {
start_points[y][x] = -1;
hole_length[y][x] = -1;
}
}
for (y = sy; y < sy+sh; y++) {
count = 0;
mode = FIND_START;
for (x = sx; x < sx + sw; x++) {
if ((mode == FIND_START) && (mask_bmp->bm_data[mask_bmp->bm_rowsize*y+x] == TRANSPARENCY_COLOR)) {
start_points[y][count] = x;
mode = FIND_STOP;
} else if ((mode == FIND_STOP) && (mask_bmp->bm_data[mask_bmp->bm_rowsize*y+x] != TRANSPARENCY_COLOR)) {
hole_length[y][count] = x - start_points[y][count];
count++;
mode = FIND_START;
}
}
if (mode == FIND_STOP) {
hole_length[y][count] = x - start_points[y][count];
count++;
}
Assert(count <= MAX_HOLES);
}
}
void gr_ibitblt_find_hole_size(grs_bitmap *mask_bmp, int *minx, int *miny, int *maxx, int *maxy)
{
ubyte c;
int x, y, count = 0;
Assert( (!(mask_bmp->bm_flags&BM_FLAG_RLE)) );
Assert( mask_bmp->bm_flags&BM_FLAG_TRANSPARENT );
*minx = mask_bmp->bm_w - 1;
*maxx = 0;
*miny = mask_bmp->bm_h - 1;
*maxy = 0;
if (scanline == NULL)
scanline = (double *)malloc(sizeof(double) * (MAX_WIDTH / sizeof(double)));
for (y = 0; y < mask_bmp->bm_h; y++) {
for (x = 0; x < mask_bmp->bm_w; x++) {
c = mask_bmp->bm_data[mask_bmp->bm_rowsize*y+x];
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);
}
#endif /* __MSDOS__ */ // was: /* !MACINTOSH */
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