/*
alpha0ps.c
This frei0r plugin is for display & manipulation of alpha channel
Version 0.1 jul 2010
Copyright (C) 2010 Marko Cebokli http://lea.hamradio.si/~s57uuu
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., 675 Mass Ave, Cambridge, MA 02139, USA.
28 aug 2012 ver 0.2 endian proofing
03 sep 2012 ver 0.3 add alpha blur
*/
//compile: gcc -c -fPIC -Wall alpha0ps.c -o alpha0ps.o
//link: gcc -shared -o alpha0ps.so alpha0ps.o
#include <stdio.h>
#include <frei0r.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include "fibe_f.h"
//----------------------------------------
//struktura za instanco efekta
typedef struct
{
int h;
int w;
//parameters
int disp;
int din;
int op;
float thr;
float sga;
int inv;
//auxilliary variables for fibe2o
float f,q,a0,a1,a2,b0,b1,b2,rd1,rd2,rs1,rs2,rc1,rc2;
} inst;
//---------------------------------------------------
void alphagray(inst *in, uint8_t *infr, uint8_t *oufr)
{
uint8_t s;
int i;
if (in->din==0)
for (i=0;i<in->w*in->h;i++)
{
s=oufr[4*i+3];
oufr[4*i]=s;
oufr[4*i+1]=s;
oufr[4*i+2]=s;
oufr[4*i+3]=0xFF;
}
else
for (i=0;i<in->w*in->h;i++)
{
s=infr[4*i+3];
oufr[4*i]=s;
oufr[4*i+1]=s;
oufr[4*i+2]=s;
oufr[4*i+3]=0xFF;
}
}
//---------------------------------------------------
void grayred(inst *in, uint8_t *infr, uint8_t *oufr)
{
int i,rr;
uint8_t r,g,b,a,y;
if (in->din==0)
for (i=0;i<in->w*in->h;i++)
{
b=infr[4*i+2];
g=infr[4*i+1];
r=infr[4*i];
a=oufr[4*i+3];
y=(r>>2)+(g>>1)+(b>>2); //approx luma
y=64+(y>>1);
rr=y+(a>>1);
if (rr>255) rr=255;
oufr[4*i]=rr;
oufr[4*i+1]=y;
oufr[4*i+2]=y;
oufr[4*i+3]=0xFF;
}
else
for (i=0;i<in->w*in->h;i++)
{
b=infr[4*i+2];
g=infr[4*i+1];
r=infr[4*i];
a=infr[4*i+3];
y=(r>>2)+(g>>1)+(b>>2); //approx luma
y=64+(y>>1);
rr=y+(a>>1);
if (rr>255) rr=255;
oufr[4*i]=rr;
oufr[4*i+1]=y;
oufr[4*i+2]=y;
oufr[4*i+3]=0xFF;
}
}
//---------------------------------------------------
void drawsel(inst *in, uint8_t *infr, uint8_t *oufr, int bg)
{
int i;
uint32_t bk;
uint32_t r,g,b,a;
switch (bg)
{
case 0: bk=0x00; break;
case 1: bk=0x80; break;
case 2: bk=0xFF; break;
default: break;
}
if (in->din==0)
for (i=0;i<in->w*in->h;i++)
{
if (bg==3)
{
if (((i/8)%2)^((i/8/in->w)%2))
bk=0x64;
else
bk=0x9B;
}
b=oufr[4*i+2];
g=oufr[4*i+1];
r=oufr[4*i];
a=oufr[4*i+3];
r=(a*r+(255-a)*bk)>>8;
g=(a*g+(255-a)*bk)>>8;
b=(a*b+(255-a)*bk)>>8;
oufr[4*i]=r;
oufr[4*i+1]=g;
oufr[4*i+2]=b;
oufr[4*i+3]=0xFF;
}
else
for (i=0;i<in->w*in->h;i++)
{
if (bg==3)
{
if (((i/8)%2)^((i/8/in->w)%2))
bk=0x64;
else
bk=0x9B;
}
b=infr[4*i+2];
g=infr[4*i+1];
r=infr[4*i];
a=infr[4*i+3];
r=(a*r+(255-a)*bk)>>8;
g=(a*g+(255-a)*bk)>>8;
b=(a*b+(255-a)*bk)>>8;
oufr[4*i]=r;
oufr[4*i+1]=g;
oufr[4*i+2]=b;
oufr[4*i+3]=0xFF;
}
}
//----------------------------------------------------------
//shave based on average of 8 neighbors
void shave_alpha(float *sl, float *ab, int w, int h)
{
int i,j,p;
float m;
for (i=1;i<h-1;i++)
{
p=i*w+1;
for (j=1;j<w-1;j++)
{
m = sl[p-1] + sl[p+1] + sl[p-w] + sl[p+w] + sl[p-1-w] + sl[p+1+w] + sl[p+1-w] + sl[p-1+w];
m=m*0.125;
ab[p] = (sl[p]<m) ? sl[p] : m;
p++;
}
}
for (i=0;i<w*h;i++) sl[i]=ab[i];
}
//----------------------------------------------------------
void grow_alpha(float *al, float *ab,
int w, int h, int mode)
{
int i,j,p;
float m,md;
switch(mode)
{
case 0:
for (i=1;i<h-1;i++)
{
p=i*w+1;
for (j=1;j<w-1;j++)
{
ab[p]=al[p];
if (al[p]<al[p-1])
ab[p]=al[p-1];
if (al[p]<al[p+1])
ab[p]=al[p+1];
if (al[p]<al[p-w])
ab[p]=al[p-w];
if (al[p]<al[p+w])
ab[p]=al[p+w];
p++;
}
}
break;
case 1:
for (i=1;i<h-1;i++)
{
p=i*w+1;
for (j=1;j<w-1;j++)
{
m=al[p];
if (al[p]<al[p-1])
m=al[p-1];
if (al[p]<al[p+1])
m=al[p+1];
if (al[p]<al[p-w])
m=al[p-w];
if (al[p]<al[p+w])
m=al[p+w];
md=al[p];
if (al[p]<al[p-1-w])
md=al[p-1-w];
if (al[p]<al[p+1-w])
md=al[p+1-w];
if (al[p]<al[p-1+w])
md=al[p-1+w];
if (al[p]<al[p+1+w])
md=al[p+1+w];
ab[p]=0.4*al[p]+0.4*m+0.2*md;
// ab[p]=0.3*al[p]+0.4*m+0.3*md;
p++;
}
}
break;
}
for (i=0;i<w*h;i++) al[i]=ab[i];
}
//----------------------------------------------------------
void shrink_alpha(float *al, float *ab,
int w, int h, int mode)
{
int i,j,p;
float m,md;
switch(mode)
{
case 0:
for (i=1;i<h-1;i++)
{
p=i*w+1;
for (j=1;j<w-1;j++)
{
ab[p]=al[p];
if (al[p]>al[p-1])
ab[p]=al[p-1];
if (al[p]>al[p+1])
ab[p]=al[p+1];
if (al[p]>al[p-w])
ab[p]=al[p-w];
if (al[p]>al[p+w])
ab[p]=al[p+w];
p++;
}
}
break;
case 1:
for (i=1;i<h-1;i++)
{
p=i*w+1;
for (j=1;j<w-1;j++)
{
m=al[p];
if (al[p]>al[p-1])
m=al[p-1];
if (al[p]>al[p+1])
m=al[p+1];
if (al[p]>al[p-w])
m=al[p-w];
if (al[p]>al[p+w])
m=al[p+w];
md=al[p];
if (al[p]>al[p-1-w])
md=al[p-1-w];
if (al[p]>al[p+1-w])
md=al[p+1-w];
if (al[p]>al[p-1+w])
md=al[p-1+w];
if (al[p]>al[p+1+w])
md=al[p+1+w];
ab[p]=0.4*al[p]+0.4*m+0.2*md;
// ab[p]=0.3*al[p]+0.4*m+0.3*md;
p++;
}
}
break;
}
for (i=0;i<w*h;i++) al[i]=ab[i];
}
//---------------------------------------------------------
void threshold_alpha(float *al, int w, int h, float thr, float hi, float lo)
{
int i;
for (i=0;i<w*h;i++)
al[i] = (al[i]>thr) ? hi : lo;
}
//----------------------------------------------------------
void blur_alpha(inst *in, float *falpha)
{
int i;
for (i=0;i<in->w*in->h;i++) falpha[i]*=0.0039215;
fibe2o_f(falpha, in->w, in->h, in->a1, in->a2, in->rd1, in->rd2, in->rs1, in->rs2, in->rc1, in->rc2, 1);
for (i=0;i<in->w*in->h;i++)
{
falpha[i]*=255.0;
if (falpha[i]>255.0) falpha[i]=255.0;
if (falpha[i]<0.0) falpha[i]=0.0;
}
}
//--------------------------------------------------------
//Aitken-Neville interpolacija iz 4 tock (tretjega reda)
//t = stevilo tock v arrayu
//array xt naj bo v rastocem zaporedju, lahko neekvidistanten
float AitNev3(int t, float xt[], float yt[], float x)
{
float p[10];
int i,j,m;
if ((x<xt[0])||(x>xt[t-1]))
{
// printf("\n\n x=%f je izven mej tabele!",x);
return 1.0/0.0;
}
//poisce, katere tocke bo uporabil
m=0; while (x>xt[m++]);
m=m-4/2-1; if (m<0) m=0; if ((m+4)>(t-1)) m=t-4;
for (i=0;i<4;i++)
p[i]=yt[i+m];
for (j=1;j<4;j++)
for (i=(4-1);i>=j;i--)
{
p[i]=p[i]+(x-xt[i+m])/(xt[i+m]-xt[i-j+m])*(p[i]-p[i-1]);
}
return p[4-1];
}
//-----------------------------------------------------
//stretch [0...1] to parameter range [min...max] linear
float map_value_forward(double v, float min, float max)
{
return min+(max-min)*v;
}
//-----------------------------------------------------
//collapse from parameter range [min...max] to [0...1] linear
double map_value_backward(float v, float min, float max)
{
return (v-min)/(max-min);
}
//***********************************************
// OBVEZNE FREI0R FUNKCIJE
//-----------------------------------------------
int f0r_init()
{
return 1;
}
//------------------------------------------------
void f0r_deinit()
{
}
//-----------------------------------------------
void f0r_get_plugin_info(f0r_plugin_info_t* info)
{
info->name="alpha0ps";
info->author="Marko Cebokli";
info->plugin_type=F0R_PLUGIN_TYPE_FILTER;
info->color_model=F0R_COLOR_MODEL_RGBA8888;
info->frei0r_version=FREI0R_MAJOR_VERSION;
info->major_version=0;
info->minor_version=4;
info->num_params=6;
info->explanation="Display and manipulation of the alpha channel";
}
//--------------------------------------------------
void f0r_get_param_info(f0r_param_info_t* info, int param_index)
{
switch(param_index)
{
case 0:
info->name = "Display";
info->type = F0R_PARAM_DOUBLE;
info->explanation = "";
break;
case 1:
info->name = "Display input alpha";
info->type = F0R_PARAM_BOOL;
info->explanation = "";
break;
case 2:
info->name = "Operation";
info->type = F0R_PARAM_DOUBLE;
info->explanation = "";
break;
case 3:
info->name = "Threshold";
info->type = F0R_PARAM_DOUBLE;
info->explanation = "";
break;
case 4:
info->name = "Shrink/Grow/Blur amount";
info->type = F0R_PARAM_DOUBLE;
info->explanation = "";
break;
case 5:
info->name = "Invert";
info->type = F0R_PARAM_BOOL;
info->explanation = "";
break;
}
}
//----------------------------------------------
f0r_instance_t f0r_construct(unsigned int width, unsigned int height)
{
inst *in;
in=calloc(1,sizeof(inst));
in->w=width;
in->h=height;
in->disp=0;
in->din=0;
in->op=0;
in->thr=0.5;
in->sga=1.0;
in->inv=0;
in->f=0.05; in->q=0.55; //blur
calcab_lp1(in->f, in->q, &in->a0, &in->a1, &in->a2, &in->b0, &in->b1, &in->b2);
in->a1=in->a1/in->a0; in->a2=in->a2/in->a0;
rep(-0.5, 0.5, 0.0, &in->rd1, &in->rd2, 256, in->a1, in->a2);
rep(1.0, 1.0, 0.0, &in->rs1, &in->rs2, 256, in->a1, in->a2);
rep(0.0, 0.0, 1.0, &in->rc1, &in->rc2, 256, in->a1, in->a2);
return (f0r_instance_t)in;
}
//---------------------------------------------------
void f0r_destruct(f0r_instance_t instance)
{
inst *in;
in=(inst*)instance;
free(instance);
}
//-----------------------------------------------------
void f0r_set_param_value(f0r_instance_t instance, f0r_param_t parm, int param_index)
{
inst *p;
double tmpf;
int tmpi,chg;
p=(inst*)instance;
float am1[]={0.499999,0.7,1.0,1.5,2.0,3.0,4.0,5.0,7.0,10.0,15.0,20.0,30.0,40.0,50.0,70.0,100.0,150.0,200.00001};
float iir2f[]={0.475,0.39,0.325,0.26,0.21,0.155,0.112,0.0905,0.065,0.0458,0.031,0.0234,0.01575,0.0118,0.0093,0.00725,0.00505,0.0033,0.0025};
float iir2q[]={0.53,0.53,0.54,0.54,0.54,0.55,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6,0.6};
chg=0;
switch(param_index)
{
case 0: //Display
tmpi=map_value_forward(*((double*)parm), 0.0, 6.9999);
if (p->disp != tmpi) chg=1;
p->disp=tmpi;
break;
case 1: //Display input alpha
tmpi=map_value_forward(*((double*)parm), 0.0, 1.0); //BOOL!!
if (p->din != tmpi) chg=1;
p->din=tmpi;
break;
case 2: //Operation
tmpi=map_value_forward(*((double*)parm), 0.0, 7.9999);
if (p->op != tmpi) chg=1;
p->op=tmpi;
break;
case 3: //Threshold
tmpf=*(double*)parm;
if (tmpf!=p->thr) chg=1;
p->thr=tmpf;
break;
case 4: //Shrink/Grow/Blur amount
tmpf=map_value_forward(*((double*)parm), 0.0, 4.9999);
if (p->sga != tmpf) chg=1;
p->sga=tmpf;
break;
case 5: //Invert
tmpi=map_value_forward(*((double*)parm), 0.0, 1.0); //BOOL!!
if (p->inv != tmpi) chg=1;
p->inv=tmpi;
break;
}
if (chg==0) return;
if (param_index==4) // blur amount changed
{
p->f=AitNev3(19, am1, iir2f, 0.5+3.0*p->sga);
p->q=AitNev3(19, am1, iir2q, 0.5+3.0*p->sga);
calcab_lp1(p->f, p->q, &p->a0, &p->a1, &p->a2, &p->b0, &p->b1, &p->b2);
p->a1=p->a1/p->a0; p->a2=p->a2/p->a0;
rep(-0.5, 0.5, 0.0, &p->rd1, &p->rd2, 256, p->a1, p->a2);
rep(1.0, 1.0, 0.0, &p->rs1, &p->rs2, 256, p->a1, p->a2);
rep(0.0, 0.0, 1.0, &p->rc1, &p->rc2, 256, p->a1, p->a2);
}
}
//--------------------------------------------------
void f0r_get_param_value(f0r_instance_t instance, f0r_param_t param, int param_index)
{
inst *p;
p=(inst*)instance;
switch(param_index)
{
case 0:
*((double*)param)=map_value_backward(p->disp, 0.0, 6.9999);
break;
case 1:
*((double*)param)=map_value_backward(p->din, 0.0, 1.0);//BOOL!!
break;
case 2:
*((double*)param)=map_value_backward(p->op, 0.0, 6.9999);
break;
case 3:
*((double*)param)=p->thr;
break;
case 4:
*((double*)param)=map_value_backward(p->sga, 0.0, 2.9999);
break;
case 5:
*((double*)param)=map_value_backward(p->inv, 0.0, 1.0);//BOOL!!
break;
}
}
//-------------------------------------------------
void f0r_update(f0r_instance_t instance, double time, const uint32_t* inframe, uint32_t* outframe)
{
inst *in;
int i;
float *falpha, *ab;
uint8_t *infr, *oufr;
assert(instance);
in=(inst*)instance;
infr=(uint8_t*)inframe;
oufr=(uint8_t*)outframe;
falpha = calloc(in->w * in->h, sizeof(float));
ab = calloc(in->w * in->h, sizeof(float));
for (i=0;i<in->w*in->h;i++)
falpha[i] = infr[4*i+3];
switch (in->op)
{
case 0: break;
case 1:
for (i=0;i<in->sga;i++)
shave_alpha(falpha, ab, in->w, in->h);
break;
case 2:
for (i=0;i<in->sga;i++)
shrink_alpha(falpha, ab, in->w, in->h, 0);
break;
case 3:
for (i=0;i<in->sga;i++)
shrink_alpha(falpha, ab, in->w, in->h, 1);
break;
case 4:
for (i=0;i<in->sga;i++)
grow_alpha(falpha, ab, in->w, in->h, 0);
break;
case 5:
for (i=0;i<in->sga;i++)
grow_alpha(falpha, ab, in->w, in->h, 1);
break;
case 6:
threshold_alpha(falpha, in->w, in->h, 255.0*in->thr, 255.0, 0.0);
break;
case 7:
blur_alpha(in, falpha);
break;
default:
break;
}
if (in->inv==1)
for (i=0;i<in->w*in->h;i++)
falpha[i] = 255.0 - falpha[i];
for (i=0;i<in->w*in->h;i++)
{
outframe[i] = inframe[i];
oufr[4*i+3] = (uint8_t) falpha[i];
}
switch (in->disp)
{
case 0:
break;
case 1:
alphagray(in, infr, oufr);
break;
case 2:
grayred(in, infr, oufr);
break;
case 3:
drawsel(in, infr, oufr, 0);
break;
case 4:
drawsel(in, infr, oufr, 1);
break;
case 5:
drawsel(in, infr, oufr, 2);
break;
case 6:
drawsel(in, infr, oufr, 3);
break;
default:
break;
}
free(falpha);
free(ab);
}
//**********************************************************