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b9092d6271
netsurf/atari/plot/plotter.c
Ole Loots b9092d6271 Restructured the plotter driver struct and declared misc functions static within the vdi driver. 
svn path=/trunk/netsurf/; revision=13519
2012-03-14 22:06:07 +00:00

663 lines
19 KiB
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/*
* Copyright 2010 Ole Loots <ole@monochrom.net>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf 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; version 2 of the License.
*
* NetSurf 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <windom.h>
#include <assert.h>
#include <mint/osbind.h>
#include <mint/cookie.h>
#include <Hermes/Hermes.h>
#include "desktop/plot_style.h"
#include "atari/bitmap.h"
#include "image/bitmap.h"
#include "atari/plot/eddi.h"
#include "atari/plot/plotter.h"
#include "atari/plot/plotter_vdi.h"
#ifdef WITH_GD_PLOTTER
#include "atari/plot/plotter_gd.h"
#endif
#ifdef WITH_VDI_FONT_DRIVER
#include "atari/plot/font_vdi.h"
#endif
#ifdef WITH_INTERNAL_FONT_DRIVER
#include "atari/plot/font_internal.h"
#endif
#ifdef WITH_FREETYPE_FONT_DRIVER
#include "atari/plot/font_freetype.h"
#endif
#include "atari/gui.h"
#include "utils/log.h"
#include "atari/misc.h"
#include "atari/osspec.h"
struct s_driver_table_entry screen_driver_table[] =
{
{
(char*)"vdi",
ctor_plotter_vdi,
PLOT_FLAG_HAS_ALPHA,
32
},
#ifdef WITH_GD_PLOTTER
{
(char*)"gd",
ctor_plotter_gd,
PLOT_FLAG_OFFSCREEN | PLOT_FLAG_HAS_ALPHA,
32
},
#endif
{(char*)NULL, NULL, 0, 0 }
};
const struct s_font_driver_table_entry font_driver_table[] =
{
#ifdef WITH_VDI_FONT_DRIVER
{"vdi", ctor_font_plotter_vdi, 0},
#endif
#ifdef WITH_FREETYPE_FONT_DRIVER
{"freetype", ctor_font_plotter_freetype, 0},
#endif
#ifdef WITH_INTERNAL_FONT_DRIVER
{"internal", ctor_font_plotter_internal, 0},
#endif
{(char*)NULL, NULL, 0}
};
unsigned short vdi_web_pal[216][3] = {
{0x000,0x000,0x000}, {0x0c8,0x000,0x000}, {0x190,0x000,0x000}, {0x258,0x000,0x000}, {0x320,0x000,0x000}, {0x3e8,0x000,0x000},
{0x000,0x0c8,0x000}, {0x0c8,0x0c8,0x000}, {0x190,0x0c8,0x000}, {0x258,0x0c8,0x000}, {0x320,0x0c8,0x000}, {0x3e8,0x0c8,0x000},
{0x000,0x190,0x000}, {0x0c8,0x190,0x000}, {0x190,0x190,0x000}, {0x258,0x190,0x000}, {0x320,0x190,0x000}, {0x3e8,0x190,0x000},
{0x000,0x258,0x000}, {0x0c8,0x258,0x000}, {0x190,0x258,0x000}, {0x258,0x258,0x000}, {0x320,0x258,0x000}, {0x3e8,0x258,0x000},
{0x000,0x320,0x000}, {0x0c8,0x320,0x000}, {0x190,0x320,0x000}, {0x258,0x320,0x000}, {0x320,0x320,0x000}, {0x3e8,0x320,0x000},
{0x000,0x3e8,0x000}, {0x0c8,0x3e8,0x000}, {0x190,0x3e8,0x000}, {0x258,0x3e8,0x000}, {0x320,0x3e8,0x000}, {0x3e8,0x3e8,0x000},
{0x000,0x000,0x0c8}, {0x0c8,0x000,0x0c8}, {0x190,0x000,0x0c8}, {0x258,0x000,0x0c8}, {0x320,0x000,0x0c8}, {0x3e8,0x000,0x0c8},
{0x000,0x0c8,0x0c8}, {0x0c8,0x0c8,0x0c8}, {0x190,0x0c8,0x0c8}, {0x258,0x0c8,0x0c8}, {0x320,0x0c8,0x0c8}, {0x3e8,0x0c8,0x0c8},
{0x000,0x190,0x0c8}, {0x0c8,0x190,0x0c8}, {0x190,0x190,0x0c8}, {0x258,0x190,0x0c8}, {0x320,0x190,0x0c8}, {0x3e8,0x190,0x0c8},
{0x000,0x258,0x0c8}, {0x0c8,0x258,0x0c8}, {0x190,0x258,0x0c8}, {0x258,0x258,0x0c8}, {0x320,0x258,0x0c8}, {0x3e8,0x258,0x0c8},
{0x000,0x320,0x0c8}, {0x0c8,0x320,0x0c8}, {0x190,0x320,0x0c8}, {0x258,0x320,0x0c8}, {0x320,0x320,0x0c8}, {0x3e8,0x320,0x0c8},
{0x000,0x3e8,0x0c8}, {0x0c8,0x3e8,0x0c8}, {0x190,0x3e8,0x0c8}, {0x258,0x3e8,0x0c8}, {0x320,0x3e8,0x0c8}, {0x3e8,0x3e8,0x0c8},
{0x000,0x000,0x190}, {0x0c8,0x000,0x190}, {0x190,0x000,0x190}, {0x258,0x000,0x190}, {0x320,0x000,0x190}, {0x3e8,0x000,0x190},
{0x000,0x0c8,0x190}, {0x0c8,0x0c8,0x190}, {0x190,0x0c8,0x190}, {0x258,0x0c8,0x190}, {0x320,0x0c8,0x190}, {0x3e8,0x0c8,0x190},
{0x000,0x190,0x190}, {0x0c8,0x190,0x190}, {0x190,0x190,0x190}, {0x258,0x190,0x190}, {0x320,0x190,0x190}, {0x3e8,0x190,0x190},
{0x000,0x258,0x190}, {0x0c8,0x258,0x190}, {0x190,0x258,0x190}, {0x258,0x258,0x190}, {0x320,0x258,0x190}, {0x3e8,0x258,0x190},
{0x000,0x320,0x190}, {0x0c8,0x320,0x190}, {0x190,0x320,0x190}, {0x258,0x320,0x190}, {0x320,0x320,0x190}, {0x3e8,0x320,0x190},
{0x000,0x3e8,0x190}, {0x0c8,0x3e8,0x190}, {0x190,0x3e8,0x190}, {0x258,0x3e8,0x190}, {0x320,0x3e8,0x190}, {0x3e8,0x3e8,0x190},
{0x000,0x000,0x258}, {0x0c8,0x000,0x258}, {0x190,0x000,0x258}, {0x258,0x000,0x258}, {0x320,0x000,0x258}, {0x3e8,0x000,0x258},
{0x000,0x0c8,0x258}, {0x0c8,0x0c8,0x258}, {0x190,0x0c8,0x258}, {0x258,0x0c8,0x258}, {0x320,0x0c8,0x258}, {0x3e8,0x0c8,0x258},
{0x000,0x190,0x258}, {0x0c8,0x190,0x258}, {0x190,0x190,0x258}, {0x258,0x190,0x258}, {0x320,0x190,0x258}, {0x3e8,0x190,0x258},
{0x000,0x258,0x258}, {0x0c8,0x258,0x258}, {0x190,0x258,0x258}, {0x258,0x258,0x258}, {0x320,0x258,0x258}, {0x3e8,0x258,0x258},
{0x000,0x320,0x258}, {0x0c8,0x320,0x258}, {0x190,0x320,0x258}, {0x258,0x320,0x258}, {0x320,0x320,0x258}, {0x3e8,0x320,0x258},
{0x000,0x3e8,0x258}, {0x0c8,0x3e8,0x258}, {0x190,0x3e8,0x258}, {0x258,0x3e8,0x258}, {0x320,0x3e8,0x258}, {0x3e8,0x3e8,0x258},
{0x000,0x000,0x320}, {0x0c8,0x000,0x320}, {0x190,0x000,0x320}, {0x258,0x000,0x320}, {0x320,0x000,0x320}, {0x3e8,0x000,0x320},
{0x000,0x0c8,0x320}, {0x0c8,0x0c8,0x320}, {0x190,0x0c8,0x320}, {0x258,0x0c8,0x320}, {0x320,0x0c8,0x320}, {0x3e8,0x0c8,0x320},
{0x000,0x190,0x320}, {0x0c8,0x190,0x320}, {0x190,0x190,0x320}, {0x258,0x190,0x320}, {0x320,0x190,0x320}, {0x3e8,0x190,0x320},
{0x000,0x258,0x320}, {0x0c8,0x258,0x320}, {0x190,0x258,0x320}, {0x258,0x258,0x320}, {0x320,0x258,0x320}, {0x3e8,0x258,0x320},
{0x000,0x320,0x320}, {0x0c8,0x320,0x320}, {0x190,0x320,0x320}, {0x258,0x320,0x320}, {0x320,0x320,0x320}, {0x3e8,0x320,0x320},
{0x000,0x3e8,0x320}, {0x0c8,0x3e8,0x320}, {0x190,0x3e8,0x320}, {0x258,0x3e8,0x320}, {0x320,0x3e8,0x320}, {0x3e8,0x3e8,0x320},
{0x000,0x000,0x3e8}, {0x0c8,0x000,0x3e8}, {0x190,0x000,0x3e8}, {0x258,0x000,0x3e8}, {0x320,0x000,0x3e8}, {0x3e8,0x000,0x3e8},
{0x000,0x0c8,0x3e8}, {0x0c8,0x0c8,0x3e8}, {0x190,0x0c8,0x3e8}, {0x258,0x0c8,0x3e8}, {0x320,0x0c8,0x3e8}, {0x3e8,0x0c8,0x3e8},
{0x000,0x190,0x3e8}, {0x0c8,0x190,0x3e8}, {0x190,0x190,0x3e8}, {0x258,0x190,0x3e8}, {0x320,0x190,0x3e8}, {0x3e8,0x190,0x3e8},
{0x000,0x258,0x3e8}, {0x0c8,0x258,0x3e8}, {0x190,0x258,0x3e8}, {0x258,0x258,0x3e8}, {0x320,0x258,0x3e8}, {0x3e8,0x258,0x3e8},
{0x000,0x320,0x3e8}, {0x0c8,0x320,0x3e8}, {0x190,0x320,0x3e8}, {0x258,0x320,0x3e8}, {0x320,0x320,0x3e8}, {0x3e8,0x320,0x3e8},
{0x000,0x3e8,0x3e8}, {0x0c8,0x3e8,0x3e8}, {0x190,0x3e8,0x3e8}, {0x258,0x3e8,0x3e8}, {0x320,0x3e8,0x3e8}, {0x3e8,0x3e8,0x3e8}
};
/* get index to driver in driver list by name */
static int drvrname_idx( char * name );
/* Error code translations: */
static const char * plot_error_codes[] =
{
"None",
"ERR_BUFFERSIZE_EXCEEDS_SCREEN",
"ERR_NO_MEM",
"ERR_PLOTTER_NOT_AVAILABLE"
};
struct s_vdi_sysinfo vdi_sysinfo;
struct s_vdi_sysinfo * read_vdi_sysinfo( short vdih, struct s_vdi_sysinfo * info ) {
unsigned long cookie_EdDI=0;
short out[300];
memset( info, 0, sizeof(struct s_vdi_sysinfo) );
info->vdi_handle = vdih;
if ( tos_getcookie(C_EdDI, &cookie_EdDI) == C_NOTFOUND ) {
info->EdDiVersion = 0;
} else {
info->EdDiVersion = EdDI_version( (void *)cookie_EdDI );
}
memset( &out, 0, sizeof(short)*300 );
vq_extnd( vdih, 0, (short*)&out );
info->scr_w = out[0]+1;
info->scr_h = out[1]+1;
if( out[39] == 2 ) {
info->scr_bpp = 1;
info->colors = out[39];
} else {
info->colors = out[39];
}
memset( &out, 0, sizeof(short)*300 );
vq_extnd( vdih, 1, (short*)&out );
info->scr_bpp = out[4];
info->maxpolycoords = out[14];
info->maxintin = out[15];
if( out[30] & 1 ) {
info->rasterscale = true;
} else {
info->rasterscale = false;
}
switch( info->scr_bpp ) {
case 8:
info->pixelsize=1;
break;
case 15:
case 16:
info->pixelsize=2;
break;
case 24:
info->pixelsize=3;
break;
case 32:
info->pixelsize=4;
break;
case 64:
info->pixelsize=8;
break;
default:
info->pixelsize=1;
break;
}
info->pitch = info->scr_w * info->pixelsize;
info->vdiformat = ( (info->scr_bpp <= 8) ? VDI_FORMAT_INTER : VDI_FORMAT_PACK);
info->screensize = ( info->scr_w * info->pixelsize ) * info->scr_h;
if( info->EdDiVersion >= EDDI_10 ) {
memset( &out, 0, sizeof(short)*300 );
vq_scrninfo(vdih, (short*)&out);
info->vdiformat = out[0];
info->clut = out[1];
info->scr_bpp = out[2];
info->hicolors = *((unsigned long*) &out[3]);
if( info->EdDiVersion >= EDDI_11 ) {
info->pitch = out[5];
info->screen = (void *) *((unsigned long *) &out[6]);
}
switch( info->clut ) {
case VDI_CLUT_HARDWARE:
{
}
break;
case VDI_CLUT_SOFTWARE:
{
int component; /* red, green, blue, alpha, overlay */
int num_bit;
unsigned short *tmp_p;
/* We can build masks with info here */
tmp_p = (unsigned short *) &out[16];
for (component=0;component<5;component++) {
for (num_bit=0;num_bit<16;num_bit++) {
unsigned short val;
val = *tmp_p++;
if (val == 0xffff) {
continue;
}
switch(component) {
case 0:
info->mask_r |= 1<< val;
break;
case 1:
info->mask_g |= 1<< val;
break;
case 2:
info->mask_b |= 1<< val;
break;
case 3:
info->mask_a |= 1<< val;
break;
}
}
}
}
/* Remove lower green bits for Intel endian screen */
if ((info->mask_g == ((7<<13)|3)) || (info->mask_g == ((7<<13)|7))) {
info->mask_g &= ~(7<<13);
}
break;
case VDI_CLUT_NONE:
break;
}
}
}
/*
lookup an plotter ID by name
*/
static int drvrname_idx( char * name )
{
int i;
for( i = 0; ; i++) {
if( screen_driver_table[i].name == NULL ) {
return( -1 );
}
else {
if( strcmp(name, screen_driver_table[i].name) == 0 ) {
return( i );
}
}
}
}
/*
lookup of font plotter ID by name
*/
static int font_drvrname_idx( char * name )
{
int i;
for( i = 0; ; i++) {
if( font_driver_table[i].name == NULL ) {
return( -1 );
}
else {
if( strcmp(name, font_driver_table[i].name) == 0 ) {
return( i );
}
}
}
}
/*
Get an plotter info entry, the entry contains an pointer to ctor
*/
struct s_driver_table_entry * get_screen_driver_entry( char * name )
{
int idx = drvrname_idx( name );
if( idx < 0 )
return( 0 );
else
return( &screen_driver_table[idx] );
}
/*
Get an font plotter info entry, the entry contains an pointer to ctor.
*/
struct s_font_driver_table_entry * get_font_driver_entry( char * name )
{
int idx = font_drvrname_idx( name );
if( idx < 0 )
return( 0 );
else
return( (struct s_font_driver_table_entry *)&font_driver_table[idx] );
}
/*
Create an new text plotter object
*/
FONT_PLOTTER new_font_plotter( int vdihandle, char * name, unsigned long flags, int * error)
{
int i=0;
int res = 0-ERR_PLOTTER_NOT_AVAILABLE;
FONT_PLOTTER fplotter = (FONT_PLOTTER)malloc( sizeof(struct s_font_plotter) );
if( fplotter == NULL ) {
*error = 0-ERR_NO_MEM;
return( NULL );
}
memset( fplotter, 0, sizeof(FONT_PLOTTER));
fplotter->vdi_handle = vdihandle;
fplotter->name = name;
fplotter->flags = 0;
fplotter->flags |= flags;
for( i = 0; ; i++) {
if( font_driver_table[i].name == NULL ) {
res = 0-ERR_PLOTTER_NOT_AVAILABLE;
break;
} else {
if( strcmp(name, font_driver_table[i].name) == 0 ) {
if( font_driver_table[i].ctor ) {
res = font_driver_table[i].ctor( fplotter );
*error = 0;
} else {
res = 0-ERR_PLOTTER_NOT_AVAILABLE;
*error = res;
return (NULL);
}
break;
}
}
}
if( res < 0 ) {
free( fplotter );
*error = res;
return( NULL );
}
fplotter->plotter = NULL;
return( fplotter );
}
static bool init=false;
static int inst=0;
/*
Create an new plotter object
*/
GEM_PLOTTER new_plotter(int vdihandle, char * name, GRECT * loc_size,
int virt_bpp, unsigned long flags, FONT_PLOTTER fplotter, int * error )
{
int res = 0-ERR_PLOTTER_NOT_AVAILABLE;
int i;
assert( fplotter != NULL );
GEM_PLOTTER gemplotter = (GEM_PLOTTER)malloc( sizeof(struct s_gem_plotter) );
if( !gemplotter ) {
*error = 0-ERR_NO_MEM;
return( NULL );
}
memset( gemplotter, 0, sizeof(struct s_gem_plotter));
gemplotter->name = name;
gemplotter->vdi_handle = vdihandle;
gemplotter->flags = 0;
gemplotter->font_plotter = fplotter;
gemplotter->bpp_virt = virt_bpp;
/* request vdi info once, so every plotter is able to access the info */
if( !init ) {
/* vdi_sysinfo */
read_vdi_sysinfo( vdihandle, &vdi_sysinfo );
init = true;
}
for( i = 0; ; i++) {
if( screen_driver_table[i].name == NULL ) {
res = 0-ERR_PLOTTER_NOT_AVAILABLE;
break;
}
else {
if( strcmp(name, screen_driver_table[i].name) == 0 ) {
if( screen_driver_table[i].ctor ) {
gemplotter->flags = (screen_driver_table[i].flags | flags);
res = screen_driver_table[i].ctor( gemplotter, loc_size );
*error = 0;
} else {
res = 0-ERR_PLOTTER_NOT_AVAILABLE;
*error = res;
return (NULL);
}
break;
}
}
}
if( res < 0 ) {
free( gemplotter );
*error = res;
return( NULL );
}
inst++;
gemplotter->font_plotter->plotter = gemplotter;
return( gemplotter );
}
/*
Free an plotter
*/
int delete_plotter( GEM_PLOTTER p )
{
if( p ) {
p->dtor( p );
free( p );
p = NULL;
inst--;
if( inst == 0 ){
}
}
else
return( -1 );
return( 0 );
}
/*
Free an font plotter
*/
int delete_font_plotter( FONT_PLOTTER p )
{
if( p ) {
p->dtor(p);
free( p );
p = NULL;
}
else
return( -1 );
return( 0 );
}
/*
x - x coord
y - y coord
stride - stride in bytes
bpp - bits per pixel
*/
int calc_chunked_buffer_size(int x, int y, int stride, int bpp)
{
return( (x * (bpp >> 3)) * y );
}
/*
x - x coord
y - y coord
stride - stride in bytes
bpp - bits per pixel
*/
int get_pixel_offset( int x, int y, int stride, int bpp )
{
LOG(("byte_pp: %d, pure: %d, result: %d\n",(bpp >> 3),(y * stride + x), (y * stride + x) * (bpp >> 3)));
return( ( (y * stride) + x) * (bpp >> 3) );
}
const char* plotter_err_str(int i) { return(plot_error_codes[abs(i)]); }
void dump_vdi_info( short vdih )
{
struct s_vdi_sysinfo temp;
read_vdi_sysinfo( vdih, &temp );
printf("struct s_vdi_sysinfo {\n");
printf(" short vdi_handle: %d\n", temp.vdi_handle);
printf(" short scr_w: %d \n", temp.scr_w);
printf(" short scr_h: %d\n", temp.scr_h);
printf(" short scr_bpp: %d\n", temp.scr_bpp);
printf(" int colors: %d\n", temp.colors);
printf(" ulong hicolors: %d\n", temp.hicolors);
printf(" short pixelsize: %d\n", temp.pixelsize);
printf(" unsigned short pitch: %d\n", temp.pitch);
printf(" unsigned short vdiformat: %d\n", temp.vdiformat);
printf(" unsigned short clut: %d\n", temp.clut);
printf(" void * screen: 0x0%p\n", temp.screen);
printf(" unsigned long screensize: %d\n", temp.screensize);
printf(" unsigned long mask_r: 0x0%08x\n", temp.mask_r);
printf(" unsigned long mask_g: 0x0%08x\n", temp.mask_g);
printf(" unsigned long mask_b: 0x0%08x\n", temp.mask_b);
printf(" unsigned long mask_a: 0x0%08x\n", temp.mask_a);
printf(" short maxintin: %d\n", temp.maxintin);
printf(" short maxpolycoords: %d\n", temp.maxpolycoords);
printf(" unsigned long EdDiVersion: 0x0%03x\n", temp.EdDiVersion);
printf(" unsigned short rasterscale: 0x%2x\n", temp.rasterscale);
printf("};\n");
}
void dump_plot_drivers(void)
{
int i = 0;
while( screen_driver_table[i].name != NULL ) {
printf("%s -> max_bpp: %d, flags: %d\n",
screen_driver_table[i].name,
screen_driver_table[i].max_bpp,
screen_driver_table[i].flags
);
i++;
}
}
void dump_font_drivers(void)
{
int i = 0;
while( font_driver_table[i].name != NULL ) {
printf("%s -> flags: %d\n",
font_driver_table[i].name,
font_driver_table[i].flags
);
i++;
}
}
/*
bpp: bits per pixel,
*/
int init_mfdb(int bpp, int w, int h, uint32_t flags, MFDB * out )
{
int dststride;
dststride = MFDB_STRIDE( w );
int size = MFDB_SIZE( bpp, dststride, h );
if( bpp > 0 ) {
if( (flags & MFDB_FLAG_NOALLOC) == 0 ) {
out->fd_addr = malloc( size );
if( out->fd_addr == NULL ){
return( 0 );
}
if( (flags & MFDB_FLAG_ZEROMEM) ){
memset( out->fd_addr, 0, size );
}
}
out->fd_stand = (flags & MFDB_FLAG_STAND) ? 1 : 0;
out->fd_nplanes = (short)bpp;
out->fd_r1 = out->fd_r2 = out->fd_r3 = 0;
} else {
memset( out, 0, sizeof(MFDB) );
}
out->fd_w = dststride;
out->fd_h = h;
out->fd_wdwidth = dststride >> 4;
return( size );
}
void plotter_get_clip_grect( GEM_PLOTTER self, GRECT * out )
{
struct rect clip;
self->get_clip( self, &clip );
out->g_x = clip.x0;
out->g_y = clip.y0;
out->g_w = clip.x1 - clip.x0;
out->g_h = clip.y1 - clip.y0;
}
/*
Convert an RGB color to an VDI Color
*/
void rgb_to_vdi1000( unsigned char * in, unsigned short * out )
{
double r = ((double)in[3]/255); /* prozentsatz red */
double g = ((double)in[2]/255); /* prozentsatz green */
double b = ((double)in[1]/255); /* prozentsatz blue */
out[0] = 1000 * r + 0.5;
out[1] = 1000 * g + 0.5;
out[2] = 1000 * b + 0.5;
return;
}
void vdi1000_to_rgb( unsigned short * in, unsigned char * out )
{
double r = ((double)in[0]/1000); /* prozentsatz red */
double g = ((double)in[1]/1000); /* prozentsatz green */
double b = ((double)in[2]/1000); /* prozentsatz blue */
out[2] = 255 * r + 0.5;
out[1] = 255 * g + 0.5;
out[0] = 255 * b + 0.5;
return;
}
#ifdef WITH_8BPP_SUPPORT
short web_std_colors[6] = {0, 51, 102, 153, 204, 255};
/*
Convert an RGB color into an index into the 216 colors web pallette
*/
short rgb_to_666_index(unsigned char r, unsigned char g, unsigned char b)
{
short ret = 0;
short i;
unsigned char rgb[3] = {r,g,b};
unsigned char tval[3];
int diff_a, diff_b, diff_c;
diff_a = abs(r-g);
diff_b = abs(r-b);
diff_c = abs(r-b);
if( diff_a < 2 && diff_b < 2 && diff_c < 2 ){
if( (r!=0XFF) && (g!=0XFF) && (g!=0XFF) ){
if( ((r&0xF0)>>4) != 0 )
//printf("conv gray: %x -> %d\n", ((r&0xF0)>>4) , (OFFSET_CUST_PAL) + ((r&0xF0)>>4) );
return( (OFFSET_CUST_PAL - OFFSET_WEB_PAL) + ((r&0xF0)>>4) );
}
}
/* convert each 8bit color to 6bit web color: */
for( i=0; i<3; i++) {
if(0 == rgb[i] % web_std_colors[1] ) {
tval[i] = rgb[i] / web_std_colors[1];
}
else {
int pos = ((short)rgb[i] / web_std_colors[1]);
if( abs(rgb[i] - web_std_colors[pos]) > abs(rgb[i] - web_std_colors[pos+1]) )
tval[i] = pos+1;
else
tval[i] = pos;
}
}
return( tval[2]*36+tval[1]*6+tval[0] );
}
#endif
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