Subversion Repositories filter_foundry

/*

    This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop

    Copyright (C) 2003-5 Toby Thain, toby@telegraphics.com.au

    This program 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 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License  

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#ifdef MAC_ENV

        #include <fp.h>

#endif

#include <math.h>

#include <stdlib.h>

#ifndef PARSERTEST

#include "ff.h"

#endif

#include "funcs.h"

#include "y.tab.h"

#define RINT //no rounding for now

//#if TARGET_API_MAC_CARBON

// this is another incompatibility between Classic stdclib and OS X stdclib

// ***FIXME: need to access real OS X includes for Carbon build

//#undef RAND_MAX

//#define RAND_MAX    0x7fffffff

//#endif

extern value_type slider[],cell[],var[],map[][0x100];

extern unsigned char *image_ptr;

/* Channel z for the input pixel at coordinates x,y.

 * Coordinates are relative to passed base pointer; row stride and

 * channel count is that of Photoshop's passed input buffer. */

value_type rawsrc(value_type x,value_type y,value_type z){

#ifdef PARSERTEST

        return 0;

#else

        if(x < gpb->inRect.left)

                x = gpb->inRect.left;

        else if(x >= gpb->inRect.right)

                x = gpb->inRect.right-1;

        if(y < gpb->inRect.top)

                y = gpb->inRect.top;

        else if(y >= gpb->inRect.bottom)

                y = gpb->inRect.bottom-1;

        return ((unsigned char*)gpb->inData)[ (long)gpb->inRowBytes*(y-gpb->inRect.top)

                                                                                  + (long)nplanes*(x-gpb->inRect.left) + z ];

#endif

}

/* src(x,y,z) Channel z for the pixel at coordinates x,y.

 * Coordinates are relative to filtered area (selection). */

value_type ff_src(value_type x,value_type y,value_type z){

        if(x < 0)

                x = 0;

        else if(x >= var['X'])

                x = var['X']-1;

        if(y < 0)

                y = 0;

        else if(y >= var['Y'])

                y = var['Y']-1;

        return z >= 0 && z < var['Z'] ?

                image_ptr[(long)gpb->inRowBytes*y + (long)nplanes*x + z] : 0;

}

/* rad(d,m,z) Channel z in the source image, which is m units away,

        at an angle of d, from the center of the image */

value_type ff_rad(value_type d,value_type m,value_type z){

        return ff_src(ff_r2x(d,m) + var['X']/2, ff_r2y(d,m) + var['Y']/2, z);

}

/* ctl(i) Value of slider i, where i is an integer between 0 and 7, inclusive */

value_type ff_ctl(value_type i){

        return i>=0 && i<=7 ? slider[i] : 0;

}

/* val(i,a,b) Value of slider i, mapped onto the range a to b */

value_type ff_val(value_type i,value_type a,value_type b){

        return ((long)ff_ctl(i)*(b-a))/255 + a;

}

/* map(i,n) Item n from mapping table i, where i is an integer between

        inclusive */

value_type ff_map(value_type i,value_type n){

/*

        if( i>=0 && i<=3 && n>=0 && n<=255 ){

                int H = slider[i*2],L = slider[i*2+1];

                return n<=L || H==L ? 0 : ( n>=H ? 255 : ((n-L)*255L)/(H-L) );

        }else

                return 0;

*/

        // this code is from GIMP User Filter

        value_type x = ff_ctl(i*2),

                           y = ff_ctl(i*2+1);

        return abs(((long)n*(y-x) / 255)+x);

}

/* min(a,b) Lesser of a and b */

value_type ff_min(value_type a,value_type b){

        return a < b ? a : b;

}

/* max(a,b) Greater of a and b */

value_type ff_max(value_type a,value_type b){

        return a > b ? a : b;

}

/* abs(a) Absolute value of a */

value_type ff_abs(value_type a){

        return abs(a);

}

/* add(a,b,c) Sum of a and b, or c, whichever is lesser */

value_type ff_add(value_type a,value_type b,value_type c){

        return ff_min(a+b,c);

}

/* sub(a,b,c) Difference of a and b, or c, whichever is greater */

value_type ff_sub(value_type a,value_type b,value_type c){

        return ff_max(ff_dif(a,b),c);

}

/* dif(a,b) Absolute value of the difference of a and b */

value_type ff_dif(value_type a,value_type b){

        return abs(a-b);

}

/* rnd(a,b) Random number between a and b, inclusive */

value_type ff_rnd(value_type a,value_type b){

        return (int)((abs(a-b)+1)*(rand()/(RAND_MAX+1.))) + ff_min(a,b);

//      return ((unsigned)rand() % (ff_dif(a,b)+1)) + ff_min(a,b);

}

/* mix(a,b,n,d) Mixture of a and b by fraction n/d, a*n/d+b*(d-n)/d */

value_type ff_mix(value_type a,value_type b,value_type n,value_type d){

        return d ? ((long)a*n)/d + ((long)b*(d-n))/d : 0;

}

/* scl(a,il,ih,ol,oh) Scale a from input range (il to ih)

                      to output range (ol to oh) */

value_type ff_scl(value_type a,value_type il,value_type ih,

                                  value_type ol,value_type oh){

        return ih==il ? 0 : ol + ((long)(oh-ol)*(a-il))/(ih-il);

}

/* adapted from http://remus.rutgers.edu/~rhoads/Code/isqrt.c */

/* also see http://www.freaknet.org/martin/tape/gos/misc/personal/msc/sqrt/sqrt.c */

#define NBITS (sizeof(long)*8)

#define TOP2BITS(x) (x>>(NBITS-2))

unsigned long isqrt (unsigned long x)

{

    unsigned i;

    unsigned long a = 0, e = 0, r = 0;

    for (i=0; i < (NBITS >> 1); i++)

        {

        r <<= 2;

        r +=  TOP2BITS(x);

        x <<= 2;

        a <<= 1;

        e  =  (a<<1) | 1;

        if (r >= e)

            {

            r -= e;

            a++;

            }

        }

    return a;

}

/* sqr(x) Square root of x */

value_type ff_sqr(value_type x){

        return x < 0 ? 0 : isqrt(x);

}

/* sin(x) Sine function of x, where x is an integer between 0 and

        1024, inclusive, and the value returned is an integer

        between -512 and 512, inclusive (Windows) or -1024 and

        1024, inclusive (Mac OS) */

value_type ff_sin(value_type x){

        return ff_cos(x-256); //RINT(TRIGAMP*sin(FFANGLE(x)));

}

/* cos(x) Cosine function of x */

value_type ff_cos(value_type x){

        return costab[abs(x) % COSTABSIZE]; //RINT(TRIGAMP*cos(FFANGLE(x)));

}

/* tan(x)

        Bounded tangent function of x, where x is an integer

        between -256 and 256, inclusive, and the value returned is

         */

value_type ff_tan(value_type x){

        return tantab[(x+256) % TANTABSIZE]; //RINT(TRIGAMP*tan(FFANGLE(x)));

}

/* r2x(d,m) x displacement of the pixel m units away, at an angle of d,

   from an arbitrary center */

value_type ff_r2x(value_type d,value_type m){

        return RINT(m*cos(FFANGLE(d)));

}

/* r2y(d,m) y displacement of the pixel m units away, at an angle of d,

   from an arbitrary center */

value_type ff_r2y(value_type d,value_type m){

        return RINT(m*sin(FFANGLE(d)));

}

/* c2d(x,y) Angle displacement of the pixel at coordinates x,y */

/* note, sign of y difference is negated, as we are dealing with top-down coordinates

   angle is "observed" */

value_type ff_c2d(value_type x,value_type y){

        return RINT(TO_FFANGLE(atan2(-y,-x))); /* FIXME: why must we negate x here? */

}

/* c2m(x,y) Magnitude displacement of the pixel at coordinates x,y */

value_type ff_c2m(value_type x,value_type y){

        return isqrt((long)x*x + (long)y*y);

}

/* get(i) Returns the current cell value at i */

value_type ff_get(value_type i){

        return i>=0 && i<=0xff ? cell[i] : 0;

}

/* put(v,i) Puts the new value v into cell i */

value_type ff_put(value_type v,value_type i){

        if(i>=0 && i<=0xff)

                cell[i] = v;

        return v;

}

value_type ff_cnv(value_type m11,value_type m12,value_type m13,

                                  value_type m21,value_type m22,value_type m23,

                                  value_type m31,value_type m32,value_type m33,

                                  value_type d)

{

        long total;

        // shift x,y from selection-relative to image relative

        int x = var['x'] + gpb->filterRect.left,

                y = var['y'] + gpb->filterRect.top,

                z = var['z'];

        if(z >= 0 && z < var['Z'])

                total = m11*rawsrc(x-1,y-1,z) + m12*rawsrc(x,y-1,z) + m13*rawsrc(x+1,y-1,z)

                          + m21*rawsrc(x-1,y,  z) + m22*rawsrc(x,y,  z) + m23*rawsrc(x+1,y,  z)

                          + m31*rawsrc(x-1,y+1,z) + m32*rawsrc(x,y+1,z) + m33*rawsrc(x+1,y+1,z);

        else

                total = 0;

        return d ? total/d : 0;

}

value_type zero_val = 0;

/* predefined symbols */

struct sym_rec predefs[]={

        /* functions */

        {0,TOK_FN3,"src", (pfunc_type)ff_src, 0},

        {0,TOK_FN3,"rad", (pfunc_type)ff_rad, 0},

        {0,TOK_FN1,"ctl", (pfunc_type)ff_ctl, 0},

        {0,TOK_FN3,"val", (pfunc_type)ff_val, 0},

        {0,TOK_FN2,"map", (pfunc_type)ff_map, 0},

        {0,TOK_FN2,"min", (pfunc_type)ff_min, 0},

        {0,TOK_FN2,"max", (pfunc_type)ff_max, 0},

        {0,TOK_FN1,"abs", (pfunc_type)ff_abs, 0},

        {0,TOK_FN3,"add", (pfunc_type)ff_add, 0},

        {0,TOK_FN3,"sub", (pfunc_type)ff_sub, 0},

        {0,TOK_FN2,"dif", (pfunc_type)ff_dif, 0},

        {0,TOK_FN2,"rnd", (pfunc_type)ff_rnd, 0},

        {0,TOK_FN4,"mix", (pfunc_type)ff_mix, 0},

        {0,TOK_FN5,"scl", (pfunc_type)ff_scl, 0},

        {0,TOK_FN1,"sqr", (pfunc_type)ff_sqr, 0},

        {0,TOK_FN1,"sin", (pfunc_type)ff_sin, 0},

        {0,TOK_FN1,"cos", (pfunc_type)ff_cos, 0},

        {0,TOK_FN1,"tan", (pfunc_type)ff_tan, 0},

        {0,TOK_FN2,"r2x", (pfunc_type)ff_r2x, 0},

        {0,TOK_FN2,"r2y", (pfunc_type)ff_r2y, 0},

        {0,TOK_FN2,"c2d", (pfunc_type)ff_c2d, 0},

        {0,TOK_FN2,"c2m", (pfunc_type)ff_c2m, 0},

        {0,TOK_FN1,"get", (pfunc_type)ff_get, 0},

        {0,TOK_FN2,"put", (pfunc_type)ff_put, 0},

        {0,TOK_FN10,"cnv",(pfunc_type)ff_cnv, 0},

        /* predefined variables (names >1 characters) */

        {0,TOK_VAR,"dmin",0, &zero_val},

        {0,TOK_VAR,"mmin",0, &zero_val},

        {0,0,0,0,0}

};