ref: 1fa5ecb395cf9771300fae5da9e38b69e3aa48a9
dir: /sixel.c/
#include <sixel.h>
#include "flisp.h"
#include "cvalues.h"
#include "types.h"
#include "iostream.h"
#include "print.h"
#include "operators.h"
#include "fsixel.h"
typedef struct fso_t fso_t;
struct fso_t {
sixel_output_t *out;
sixel_dither_t *dither;
ios_t *io;
int numcolors;
int scalex;
int scaley;
uint8_t *buf;
int bufsz;
};
static sixel_allocator_t *salloc;
static int
issixeloutput(value_t v)
{
return iscvalue(v) && cv_class(ptr(v)) == FL(fsotype);
}
BUILTIN("sixel-ouput?", fsixel_outputp)
{
argcount(nargs, 1);
return issixeloutput(args[0]) ? FL(t) : FL(f);
}
static int
fso_write(char *data, int size, void *priv)
{
fso_t *f = priv;
return ios_write(f->io, data, size);
}
// :: num-colors -> ...
BUILTIN("sixel-output", fsixel_output)
{
int numcolors = 256;
if(nargs > 0){
argcount(nargs, 1);
numcolors = tosize(args[0]);
}
if(numcolors < 1 || numcolors > 256)
lerrorf(FL(ArgError), "invalid number of colors: %d", numcolors);
value_t v = cvalue(FL(fsotype), sizeof(fso_t));
fso_t *f = value2c(fso_t*, v);
if(salloc == nil)
sixel_allocator_new(&salloc, malloc, calloc, realloc, free);
SIXELSTATUS r = sixel_output_new(&f->out, fso_write, f, salloc);
if(SIXEL_FAILED(r))
lerrorf(FL(IOError), "could not create sixel output");
r = sixel_dither_new(&f->dither, numcolors, salloc);
if(SIXEL_FAILED(r))
lerrorf(FL(IOError), "could not create sixel dither");
sixel_output_set_palette_type(f->out, SIXEL_PALETTETYPE_RGB);
sixel_dither_set_pixelformat(f->dither, SIXEL_PIXELFORMAT_PAL8);
sixel_dither_set_transparent(f->dither, 0xff);
f->numcolors = numcolors;
f->scalex = f->scaley = 1;
f->buf = nil;
f->bufsz = 0;
return v;
}
BUILTIN("sixel-set-scale", fsixel_set_scale)
{
if(nargs < 2 || nargs > 3)
argcount(nargs, 2);
if(!issixeloutput(args[0]))
type_error("sixel-output", args[0]);
fso_t *f = value2c(fso_t*, args[0]);
int scalex = tosize(args[1]);
int scaley = scalex;
if(nargs > 2)
scaley = tosize(args[2]);
if(scalex < 1 || scalex > 32 || scaley < 1 || scaley > 32)
lerrorf(FL(ArgError), "invalid scale factor: %dx%d", scalex, scaley);
f->scalex = scalex;
f->scaley = scaley;
return FL(t);
}
// :: sixel-output -> palette -> [paltype ->] ...
BUILTIN("sixel-set-palette", fsixel_set_palette)
{
if(nargs < 2 || nargs > 3)
argcount(nargs, 2);
if(!issixeloutput(args[0]))
type_error("sixel-output", args[0]);
fso_t *f = value2c(fso_t*, args[0]);
bool isrgb = true;
size_t len;
if(nargs >= 3){
if(!fl_isstring(args[2]))
type_error("string", args[2]);
len = cv_len((cvalue_t*)ptr(args[2]));
char *s = cvalue_data(args[2]);
if(len == 3 && strncmp(s, "rgb", 3) == 0)
isrgb = true;
else if(len == 3 && strncmp(s, "hls", 3) == 0)
isrgb = false;
else
lerrorf(FL(ArgError), "invalid palette type (must be either \"rgb\" or \"hls\")");
}
if(!isarray(args[1]))
type_error("array", args[1]);
len = cvalue_arraylen(args[1]);
if(f->numcolors*3 != (int)len)
lerrorf(FL(ArgError), "invalid palette: expected %d colors, got %d", f->numcolors, (int)len);
fltype_t *type = cv_class(ptr(args[1]));
size_t elsize = type->elsz;
fltype_t *eltype = type->eltype;
numerictype_t nt = eltype->numtype;
uint8_t out[256*3] = {0};
if(isrgb){
if(eltype->type == FL(uint8sym) || eltype->type == FL(bytesym))
memcpy(out, cptr(args[1]), f->numcolors*3);
else
lerrorf(FL(ArgError), "invalid palette type: expected bytes");
}else{
uint8_t *pal = cptr(args[1]);
for(int i = 0; i < f->numcolors; i++){
float s = (float)conv_to_int32(pal+(i*3+2)*elsize, nt) / 100.0;
if(s == 0)
out[i*3+0] = out[i*3+1] = out[i*3+2] = 255*(int)conv_to_int32(pal+(i*3+1)*elsize, nt)/100;
else{
float h = (float)conv_to_int32(pal+(i*3+0)*elsize, nt) / 360.0;
float l = (float)conv_to_int32(pal+(i*3+1)*elsize, nt) / 100.0;
int k = h*6;
float f = h*6 - k;
float p = l*(1-s);
float q = l*(1-f*s);
float t = l*(1-(1-f)*s);
float r, g, b;
switch(k % 6){
case 0: r=l; g=t; b=p; break;
case 1: r=q; g=l; b=p; break;
case 2: r=p; g=l; b=t; break;
case 3: r=p; g=q; b=l; break;
case 4: r=t; g=p; b=l; break;
default: r=l; g=p; b=q; break;
}
out[i*3+0] = 255*r;
out[i*3+1] = 255*g;
out[i*3+2] = 255*b;
}
}
}
sixel_dither_set_palette(f->dither, out);
return FL(t);
}
// :: sixel-output -> iostream -> pixels -> width -> height -> ...
BUILTIN("sixel-encode", fsixel_encode)
{
argcount(nargs, 5);
if(!issixeloutput(args[0]))
type_error("sixel-output", args[0]);
fso_t *f = value2c(fso_t*, args[0]);
f->io = toiostream(args[1]);
uint8_t *pix;
size_t sz;
to_sized_ptr(args[2], &pix, &sz);
size_t w = tosize(args[3]);
size_t h = tosize(args[4]);
if(w <= 0 || w > sz)
bounds_error(args[2], args[3]);
if(h <= 0 || w*h > sz)
bounds_error(args[2], args[4]);
SIXELSTATUS r;
if(f->scalex > 1 || f->scaley > 1){
int ow = w * f->scalex, oh = h * f->scaley, osz = ow*oh;
if(ow < 1 || oh < 1 || osz < ow || osz < oh)
lerrorf(FL(ArgError), "scaling out of range");
if(f->bufsz < osz){
f->buf = MEM_REALLOC(f->buf, osz);
f->bufsz = osz;
}
r = sixel_helper_scale_image(
f->buf,
pix,
w, h,
SIXEL_PIXELFORMAT_PAL8,
ow, oh,
SIXEL_RES_NEAREST,
salloc
);
if(SIXEL_FAILED(r))
lerrorf(FL(IOError), "could not scale image");
w = ow;
h = oh;
pix = f->buf;
}else if(f->buf != nil){
MEM_FREE(f->buf);
f->buf = nil;
f->bufsz = 0;
}
r = sixel_encode(pix, w, h, 0, f->dither, f->out);
if(SIXEL_FAILED(r))
lerrorf(FL(IOError), "could not encode image");
return FL(t);
}
static void
print_sixeloutput(value_t v, ios_t *s)
{
USED(v);
fl_print_str("#<sixel output>", s);
}
static void
relocate_sixeloutput(value_t oldv, value_t newv)
{
fso_t *oldf = cvalue_data(oldv);
fso_t *f = cvalue_data(newv);
sixel_output_destroy(oldf->out);
SIXELSTATUS r = sixel_output_new(&f->out, fso_write, f, salloc);
if(SIXEL_FAILED(r))
lerrorf(FL(IOError), "could not recreate sixel output");
sixel_output_set_palette_type(f->out, SIXEL_PALETTETYPE_RGB);
}
static void
free_sixeloutput(value_t self)
{
fso_t *f = value2c(fso_t*, self);
sixel_dither_destroy(f->dither);
sixel_output_destroy(f->out);
MEM_FREE(f->buf);
}
static cvtable_t fso_vtable = {
print_sixeloutput,
relocate_sixeloutput,
free_sixeloutput,
nil
};
void
fsixel_init(void)
{
FL(fsosym) = symbol("sixel-output", false);
FL(fsotype) = define_opaque_type(FL(fsosym), sizeof(fso_t), &fso_vtable, nil);
}