/*
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.
*/
//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>
//----------------------------------------
//struktura za instanco efekta
typedef struct
{
int h;
int w;
int disp;
int din;
int op;
float thr;
int sga;
int inv;
float *falpha,*ab;
} inst;
//---------------------------------------------------
//RGBA8888 little endian
void alphagray(inst *in, const uint32_t* inframe, uint32_t* outframe)
{
uint32_t s;
int i;
if (in->din==0)
for (i=0;i<in->w*in->h;i++)
{
s=(outframe[i]&0xFF000000)>>24;
s=s+(s<<8)+(s<<16);
outframe[i]=(outframe[i]&0xFF000000)|s;
}
else
for (i=0;i<in->w*in->h;i++)
{
s=(inframe[i]&0xFF000000)>>24;
s=s+(s<<8)+(s<<16);
outframe[i]=(outframe[i]&0xFF000000)+s;
}
}
//---------------------------------------------------
//RGBA8888 little endian
void grayred(inst *in, const uint32_t* inframe, uint32_t* outframe)
{
int i;
uint32_t r,g,b,a,y,s;
if (in->din==0)
for (i=0;i<in->w*in->h;i++)
{
b=(inframe[i]&0x00FF0000)>>16;
g=(inframe[i]&0x0000FF00)>>8;
r=inframe[i]&0x000000FF;
a=(outframe[i]&0xFF000000)>>24;
y=(r>>2)+(g>>1)+(b>>2); //approx luma
y=64+(y>>1);
r=y+(a>>1);
if (r>255) r=255;
s=r+(y<<8)+(y<<16);
outframe[i]=(inframe[i]&0xFF000000)+s;
}
else
for (i=0;i<in->w*in->h;i++)
{
b=(inframe[i]&0x00FF0000)>>16;
g=(inframe[i]&0x0000FF00)>>8;
r=inframe[i]&0x000000FF;
a=(inframe[i]&0xFF000000)>>24;
y=(r>>2)+(g>>1)+(b>>2);
y=64+(y>>1);
r=y+(a<<1);
if (r>255) r=255;
s=r+(y<<8)+(y<<16);
outframe[i]=(inframe[i]&0xFF000000)+s;
}
}
//---------------------------------------------------
void drawsel(inst *in, const uint32_t* inframe, uint32_t* outframe, int bg)
{
int i;
uint32_t bk;
uint32_t r,g,b,a,s;
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=(outframe[i]&0x00FF0000)>>16;
g=(outframe[i]&0x0000FF00)>>8;
r=outframe[i]&0x000000FF;
a=(outframe[i]&0xFF000000)>>24;
r=a*r+(255-a)*bk;
r=r>>8;
g=a*g+(255-a)*bk;
g=g>>8;
b=a*b+(255-a)*bk;
b=b>>8;
s=r+(g<<8)+(b<<16);
outframe[i]=(inframe[i]&0xFF000000)+s;
}
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=(inframe[i]&0x00FF0000)>>16;
g=(inframe[i]&0x0000FF00)>>8;
r=inframe[i]&0x000000FF;
a=(inframe[i]&0xFF000000)>>24;
r=a*r+(255-a)*bk;
r=r>>8;
g=a*g+(255-a)*bk;
g=g>>8;
b=a*b+(255-a)*bk;
b=b>>8;
s=r+(g<<8)+(b<<16);
outframe[i]=(inframe[i]&0xFF000000)+s;
}
}
//----------------------------------------------------------
//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;
}
//-----------------------------------------------------
//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=1;
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 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;
in->inv=0;
in->falpha=(float*)calloc(in->w*in->h,sizeof(float));
in->ab=(float*)calloc(in->w*in->h,sizeof(float));
return (f0r_instance_t)in;
}
//---------------------------------------------------
void f0r_destruct(f0r_instance_t instance)
{
inst *in;
in=(inst*)instance;
free(in->falpha);
free(in->ab);
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;
chg=0;
switch(param_index)
{
case 0:
tmpi=map_value_forward(*((double*)parm), 0.0, 6.9999);
if (p->disp != tmpi) chg=1;
p->disp=tmpi;
break;
case 1:
tmpi=map_value_forward(*((double*)parm), 0.0, 1.0); //BOOL!!
if (p->din != tmpi) chg=1;
p->din=tmpi;
break;
case 2:
tmpi=map_value_forward(*((double*)parm), 0.0, 6.9999);
if (p->op != tmpi) chg=1;
p->op=tmpi;
break;
case 3:
tmpf=*(double*)parm;
if (tmpf!=p->thr) chg=1;
p->thr=tmpf;
break;
case 4:
tmpi=map_value_forward(*((double*)parm), 0.0, 2.9999);
if (p->sga != tmpi) chg=1;
p->sga=tmpi;
break;
case 5:
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;
}
//--------------------------------------------------
void f0r_get_param_value(f0r_instance_t instance, f0r_param_t param, int param_index)
{
inst *p;
double tmpf;
int tmpi;
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;
}
}
//-------------------------------------------------
//RGBA8888 little endian
void f0r_update(f0r_instance_t instance, double time, const uint32_t* inframe, uint32_t* outframe)
{
inst *in;
int i;
assert(instance);
in=(inst*)instance;
//printf("update, op=%d, inv=%d disp=%d\n",in->op,in->inv,in->disp);
for (i=0;i<in->w*in->h;i++)
in->falpha[i]=(inframe[i]&0xFF000000)>>24;
switch (in->op)
{
case 0: break;
case 1:
for (i=0;i<in->sga;i++)
shave_alpha(in->falpha, in->ab, in->w, in->h);
break;
case 2:
for (i=0;i<in->sga;i++)
shrink_alpha(in->falpha, in->ab, in->w, in->h, 0);
break;
case 3:
for (i=0;i<in->sga;i++)
shrink_alpha(in->falpha, in->ab, in->w, in->h, 1);
break;
case 4:
for (i=0;i<in->sga;i++)
grow_alpha(in->falpha, in->ab, in->w, in->h, 0);
break;
case 5:
for (i=0;i<in->sga;i++)
grow_alpha(in->falpha, in->ab, in->w, in->h, 1);
break;
case 6:
threshold_alpha(in->falpha, in->w, in->h, 255.0*in->thr, 255.0, 0.0);
break;
default:
break;
}
if (in->inv==1)
for (i=0;i<in->w*in->h;i++)
in->falpha[i]=255.0-in->falpha[i];
for (i=0;i<in->w*in->h;i++)
outframe[i] = (inframe[i]&0x00FFFFFF) | (((uint32_t)in->falpha[i])<<24);
switch (in->disp)
{
case 0:
break;
case 1:
alphagray(in, inframe, outframe);
break;
case 2:
grayred(in, inframe, outframe);
break;
case 3:
drawsel(in, inframe, outframe, 0);
break;
case 4:
drawsel(in, inframe, outframe, 1);
break;
case 5:
drawsel(in, inframe, outframe, 2);
break;
case 6:
drawsel(in, inframe, outframe, 3);
break;
default:
break;
}
}
//**********************************************************