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CnC_Remastered_Collection/REDALERT/ROTBMP.CPP

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//
// Copyright 2020 Electronic Arts Inc.
//
// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
// software: you can redistribute it and/or modify it under the terms of
// the GNU General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
// in the hope that it will be useful, but with permitted additional restrictions
// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
// distributed with this program. You should have received a copy of the
// GNU General Public License along with permitted additional restrictions
// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
/* $Header: /CounterStrike/ROTBMP.CPP 1 3/03/97 10:25a Joe_bostic $ */
/***********************************************************************************************
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
***********************************************************************************************
* *
* Project Name : Command & Conquer *
* *
* File Name : ROTBMP.CPP *
* *
* Programmer : Joe L. Bostic *
* *
* Start Date : 07/05/96 *
* *
* Last Update : July 5, 1996 [JLB] *
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#if (0)//PG
//#include "function.h"
#include "watcom.h"
#include "rotbmp.h"
#define FILE_H
#define WWMEM_H
#include <wwlib32.h>
int Rotate_Bitmap(GraphicViewPortClass * srcvp, GraphicViewPortClass * destvp, int angle);
struct WPPOINT {
int x;
int y;
};
/***************************************************************************
* Rotate_bitmap -- rotate a bitmap from srcvp to destvp *
* *
* INPUT: note that angles are 0 - 255 (best if used in increments of 4!) *
* *
* OUTPUT: *
* *
* WARNINGS: *
* destvp should be a square. width and height should be equal to : *
* MAX(srcvp->width,srcvp->height) * 1.7 (square root of 2!!) *
* *
* *
* HISTORY: *
* 01/02/1996 BP : Created. *
*=========================================================================*/
Rotate_Bitmap(GraphicViewPortClass * srcvp, GraphicViewPortClass * destvp, int a)
{
int shift = 7;
int fixpoint1 = 1 << shift; // this is a fixed point 1
int Deltax;
int Deltay;
int sx,sy,dx,dy;
int Error = 0;
int Decimal = 0;
// this is used if I walk in Y
int buffwidth = srcvp->Get_Width() + srcvp->Get_XAdd();
int buffwid2 = destvp->Get_Width() + destvp->Get_XAdd();
char * dest;
char * src;
int sa,ca;
int t;
int x,y;
int rx,ry;
int w,h;
int dw = destvp->Get_Width();
int dh = destvp->Get_Height();
WPPOINT sp[4];
WPPOINT dp[4];
sa = Sin256[a];
ca = Cos256[a];
// get rectangle size
x = 0;
y = 0;
w = srcvp->Get_Width();
h = srcvp->Get_Height();
int halfws = w >> 1;
int halfhs = h >> 1;
int halfwd = dw >> 1;
int halfhd = dh >> 1;
// make the src rectangle
sp[0].x = x;
sp[0].y = y;
sp[1].x = x + w;
sp[1].y = y;
// now calculate the rotated rectangle
dp[0].x = ( ((sp[0].x - halfws) * ca) - ((sp[0].y - halfhs) * sa) ) >> shift;
dp[0].x += halfwd;
dp[0].y = ( ((sp[0].x - halfws) * sa) + ((sp[0].y - halfhs) * ca) ) >> shift;
dp[0].y += halfhd;
dp[1].x = ( ((sp[1].x - halfws) * ca) - ((sp[1].y - halfhs) * sa) ) >> shift;
dp[1].x += halfwd;
dp[1].y = ( ((sp[1].x - halfws) * sa) + ((sp[1].y - halfhs) * ca) ) >> shift;
dp[1].y += halfhd;
rx = dp[0].x;
ry = dp[0].y;
// now calculate slope
// diff from new to old x
Deltax = (dp[1].x - dp[0].x);
// diff from new to old y
Deltay = (dp[1].y - dp[0].y);
// handle the easy cases
// no change in x
int r;
if (!Deltax) { // must be 90 or 270 degree transpose!
if (Deltay < 0) {
// walk across source in the x + dir
// walk across dest in the y - dir
x = 0;
dy = 0;
dx = 0;
for (t = 0; t< h; t++) {
x = 0;
src = MAKE_PTR(srcvp, x, y);
dest = MAKE_PTR(destvp, rx + dx, ry - dy);
for (r = 0; r< w; r++) {
// transparency
if (* src)
*dest = *src;
src++;
dest -= buffwid2;
}
y++;
dx++;
}
} else {
// walk across source in the x + dir
// walk across dest in the y + dir
x = 0;
dy = 0;
dx = 0;
for (t = 0; t< h; t++) {
x = 0;
src = MAKE_PTR(srcvp, x, y);
dest = MAKE_PTR(destvp, rx - dx, ry + dy);
for (r = 0; r< w; r++) {
// transparency
if (*src)
*dest = *src;
src++;
dest += buffwid2;
}
y++;
dx++;
}
}
return 0;
}
// no change in y
if (!Deltay) { // must be 0 or 180 degree transpose !
if (Deltax < 0) {
y = 0;
for (y = 0; y< h; y++) {
x = 0;
src = MAKE_PTR(srcvp, x, y);
dest = MAKE_PTR(destvp, rx - x , ry - y);
for (x = 0 ; x< w; x++) {
// transparency
if (*src)
*dest = *src;
dest--;
src++;
}
}
} else {
for (y = 0; y< h; y++) {
x = 0;
src = MAKE_PTR(srcvp, x, y);
dest = MAKE_PTR(destvp, rx + x, ry + y);
for (x = 0 ; x< w; x++) {
// transparency
if (*src)
*dest = *src;
dest++;
src++;
}
}
}
return 0;
}
// ok now the hard part
// make them 16.16
if ( ABS(Deltax) < ABS(Deltay)) { // ok this means we want to walk in y
// walk in + x in the src and
// walk in + y in the dest
Error = 0;
// start at left top corner in src and dest
sx = 0;
sy = 0;
dx = 0;
dy = 0;
dest = MAKE_PTR(destvp, rx + dx, ry + dy);
src = MAKE_PTR(srcvp, x + sx, y + sy);
// this gets added to error each inc of x
// when error is > 1 then inc y!
int xinc = 1;
if (Deltax < 0) {
Deltax = -Deltax;
xinc = -1;
}
int yinc = 1;
int yinc1 = 1;
if (Deltay < 0) {
Deltay = - Deltay;
buffwid2 = - buffwid2;
}
Decimal = ( Deltax << shift) / Deltay ;
// walk in X
int Deltax2 = Deltax << shift;
int Deltay2 = Deltay << shift;
// this is the ratio between the source height and the dest height
// as the rectangle rotates the height and width change
int DeltaH = (w << shift) / Deltay;
int Error2 = 0;
sy = 0;
for (int r = 0; r< h ;r++) {
// now we walk across the top calculating each rotated point
// along the side
// the use delta formula to walk in x and y in destination space
// always walking in the x in the source!
// figure out rotated location to start in dest
rx = ( ( (sx - halfws) * ca) - ( (sy - halfhs) * sa) ) >> shift;
rx += halfwd;
ry = ( ( (sx - halfws) * sa) + ( (sy - halfhs) * ca) ) >> shift;
ry += halfhd;
// this is the end point of the line
int y2 = ( ( ((w) - halfws) * sa) + ( (sy - halfhs) * ca) ) >> shift;
y2 += halfhd;
// length of line
int diff = ABS(y2 - ry);
// if walking backwards reveres diff to reflect sign
src = MAKE_PTR(srcvp, x, y + sy);
dest = MAKE_PTR(destvp, rx, ry);
Error = 0;
Error2 = 0;
char * baseptr = src;
// while walking line
while (diff--) {
char c = *src;
// transparency
if (c)
*dest = *src;
Error2 += DeltaH;
dest += buffwid2;
Error += Decimal;
src = baseptr + (Error2 >> shift) ;
// this is time to inc x in src y in dest
if (Error >= fixpoint1) {
Error -= fixpoint1;
if (*src)
*dest = *src;
dest += xinc;
}
}
sy += yinc;
}
return 0;
} else { // else we walk in X
int lasterror = 0;
Error = 0;
// start at left top corner in src and dest
sx = 0;
sy = 0;
dx = 0;
dy = 0;
dest = MAKE_PTR(destvp, rx + dx, ry + dy);
src = MAKE_PTR(srcvp, x + sx, y + sy);
// this gets added to error each inc of x
// when error is > 1 then inc y!
int xinc = 1;
if (Deltax < 0) {
Deltax = -Deltax;
xinc = -1;
}
int yinc = 1;
if (Deltay < 0) {
Deltay = - Deltay;
buffwid2 = - buffwid2;
sy = sy + h - 1;
yinc = -1;
}
Decimal = ( Deltay << shift) / Deltax ;
// walk in X
int Deltax2 = Deltax << shift;
int Deltay2 = Deltay << shift;
// this is the ratios between the source width and the dest width
// as the rectangle rotates the actual size changes!
int DeltaW = (w << shift) / Deltax;
int Error2 = 0;
for (int r = 0; r< h ;r++) {
sx = 0;
// now we walk across the side calculating each rotated point
// along the side
// the use delta formula to walk in x and y in destination space
// always walking in the x in the source!
// figure out rotated location to start
rx = ( ( (sx - halfws) * ca) - ( (sy - halfhs) * sa) ) >> shift;
rx += halfwd;
ry = ( ( (sx - halfws) * sa) + ( (sy - halfhs) * ca) ) >> shift;
ry += halfhd;
// this is the other side of the box
int x2 = ( ( ((sx + w) - halfws) * ca) - ( (sy - halfhs) * sa) ) >> shift;
x2 += halfwd;
int diff = x2 - rx;
dx = 0;
dy = 0;
if (xinc == -1) {
diff = -diff;
}
src = MAKE_PTR(srcvp, x + sx, y + sy);
dest = MAKE_PTR(destvp, rx + dx, ry + dy);
Error = 0;
Error2 = 0;
char * baseptr = src;
while (diff--) {
char c = *src;
// transparency
if (c)
*dest = *src;
Error2 += DeltaW;
rx++;
dest += xinc;
Error += Decimal;
src = baseptr + (Error2 >> shift);
if (Error >= fixpoint1) {
Error -= fixpoint1;
if (*src)
*dest = *src;
dest += buffwid2;
}
}
sy += yinc;
}
}
return 0;
}
#endif
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