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/*
* linux/drivers/video/ilbm.c -- Low level frame buffer operations for
* interleaved bitplanes à la Amiga
*
* Created 5 Apr 1997 by Geert Uytterhoeven
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <video/fbcon.h>
#include <video/fbcon-ilbm.h>
/*
* Interleaved bitplanes à la Amiga
*
* This code heavily relies on the fact that
*
* next_line == interleave == next_plane*bits_per_pixel
*
* But maybe it can be merged with the code for normal bitplanes without
* much performance loss?
*/
void fbcon_ilbm_setup(struct display *p)
{
if (p->line_length) {
p->next_line = p->line_length*p->var.bits_per_pixel;
p->next_plane = p->line_length;
} else {
p->next_line = p->type_aux;
p->next_plane = p->type_aux/p->var.bits_per_pixel;
}
}
void fbcon_ilbm_bmove(struct display *p, int sy, int sx, int dy, int dx,
int height, int width)
{
if (sx == 0 && dx == 0 && width == p->next_plane)
fb_memmove(p->screen_base+dy*fontheight(p)*p->next_line,
p->screen_base+sy*fontheight(p)*p->next_line,
height*fontheight(p)*p->next_line);
else {
u8 *src, *dest;
u_int i;
if (dy <= sy) {
src = p->screen_base+sy*fontheight(p)*p->next_line+sx;
dest = p->screen_base+dy*fontheight(p)*p->next_line+dx;
for (i = p->var.bits_per_pixel*height*fontheight(p); i--;) {
fb_memmove(dest, src, width);
src += p->next_plane;
dest += p->next_plane;
}
} else {
src = p->screen_base+(sy+height)*fontheight(p)*p->next_line+sx;
dest = p->screen_base+(dy+height)*fontheight(p)*p->next_line+dx;
for (i = p->var.bits_per_pixel*height*fontheight(p); i--;) {
src -= p->next_plane;
dest -= p->next_plane;
fb_memmove(dest, src, width);
}
}
}
}
void fbcon_ilbm_clear(struct vc_data *conp, struct display *p, int sy, int sx,
int height, int width)
{
u8 *dest;
u_int i, rows;
int bg, bg0;
dest = p->screen_base+sy*fontheight(p)*p->next_line+sx;
bg0 = attr_bgcol_ec(p,conp);
for (rows = height*fontheight(p); rows--;) {
bg = bg0;
for (i = p->var.bits_per_pixel; i--; dest += p->next_plane) {
if (bg & 1)
fb_memset255(dest, width);
else
fb_memclear(dest, width);
bg >>= 1;
}
}
}
void fbcon_ilbm_putc(struct vc_data *conp, struct display *p, int c, int yy,
int xx)
{
u8 *dest, *cdat;
u_int rows, i;
u8 d;
int fg0, bg0, fg, bg;
dest = p->screen_base+yy*fontheight(p)*p->next_line+xx;
cdat = p->fontdata+(c&p->charmask)*fontheight(p);
fg0 = attr_fgcol(p,c);
bg0 = attr_bgcol(p,c);
for (rows = fontheight(p); rows--;) {
d = *cdat++;
fg = fg0;
bg = bg0;
for (i = p->var.bits_per_pixel; i--; dest += p->next_plane) {
if (bg & 1){
if (fg & 1)
*dest = 0xff;
else
*dest = ~d;
}else{
if (fg & 1)
*dest = d;
else
*dest = 0x00;
}
bg >>= 1;
fg >>= 1;
}
}
}
/*
* I've split the console character loop in two parts:
*
* - slow version: this blits one character at a time
*
* - fast version: this blits 4 characters at a time at a longword
* aligned address, to reduce the number of expensive
* Chip RAM accesses.
*
* Experiments on my A4000/040 revealed that this makes a console switch
* on a 640x400 screen with 256 colors about 3 times faster.
*
* -- Geert
*/
void fbcon_ilbm_putcs(struct vc_data *conp, struct display *p,
const unsigned short *s, int count, int yy, int xx)
{
u8 *dest0, *dest, *cdat1, *cdat2, *cdat3, *cdat4;
u_int rows, i;
u16 c1, c2, c3, c4;
u32 d;
int fg0, bg0, fg, bg;
dest0 = p->screen_base+yy*fontheight(p)*p->next_line+xx;
c1 = scr_readw(s);
fg0 = attr_fgcol(p, c1);
bg0 = attr_bgcol(p, c1);
while (count--)
if (xx&3 || count < 3) { /* Slow version */
c1 = scr_readw(s++) & p->charmask;
dest = dest0++;
xx++;
cdat1 = p->fontdata+c1*fontheight(p);
for (rows = fontheight(p); rows--;) {
d = *cdat1++;
fg = fg0;
bg = bg0;
for (i = p->var.bits_per_pixel; i--; dest += p->next_plane) {
if (bg & 1){
if (fg & 1)
*dest = 0xff;
else
*dest = ~d;
}else{
if (fg & 1)
*dest = d;
else
*dest = 0x00;
}
bg >>= 1;
fg >>= 1;
}
}
} else { /* Fast version */
c1 = scr_readw(&s[0]) & p->charmask;
c2 = scr_readw(&s[1]) & p->charmask;
c3 = scr_readw(&s[2]) & p->charmask;
c4 = scr_readw(&s[3]) & p->charmask;
dest = dest0;
cdat1 = p->fontdata+c1*fontheight(p);
cdat2 = p->fontdata+c2*fontheight(p);
cdat3 = p->fontdata+c3*fontheight(p);
cdat4 = p->fontdata+c4*fontheight(p);
for (rows = fontheight(p); rows--;) {
#if defined(__BIG_ENDIAN)
d = *cdat1++<<24 | *cdat2++<<16 | *cdat3++<<8 | *cdat4++;
#elif defined(__LITTLE_ENDIAN)
d = *cdat1++ | *cdat2++<<8 | *cdat3++<<16 | *cdat4++<<24;
#else
#error FIXME: No endianness??
#endif
fg = fg0;
bg = bg0;
for (i = p->var.bits_per_pixel; i--; dest += p->next_plane) {
if (bg & 1){
if (fg & 1)
*(u32 *)dest = 0xffffffff;
else
*(u32 *)dest = ~d;
}else{
if (fg & 1)
*(u32 *)dest = d;
else
*(u32 *)dest = 0x00000000;
}
bg >>= 1;
fg >>= 1;
}
}
s += 4;
dest0 += 4;
xx += 4;
count -= 3;
}
}
void fbcon_ilbm_revc(struct display *p, int xx, int yy)
{
u8 *dest, *dest0;
u_int rows, i;
int mask;
dest0 = p->screen_base+yy*fontheight(p)*p->next_line+xx;
mask = p->fgcol ^ p->bgcol;
/*
* This should really obey the individual character's
* background and foreground colors instead of simply
* inverting.
*/
for (i = p->var.bits_per_pixel; i--; dest0 += p->next_plane) {
if (mask & 1) {
dest = dest0;
for (rows = fontheight(p); rows--; dest += p->next_line)
*dest = ~*dest;
}
mask >>= 1;
}
}
/*
* `switch' for the low level operations
*/
struct display_switch fbcon_ilbm = {
setup: fbcon_ilbm_setup,
bmove: fbcon_ilbm_bmove,
clear: fbcon_ilbm_clear,
putc: fbcon_ilbm_putc,
putcs: fbcon_ilbm_putcs,
revc: fbcon_ilbm_revc,
fontwidthmask: FONTWIDTH(8)
};
#ifdef MODULE
MODULE_LICENSE("GPL");
int init_module(void)
{
return 0;
}
void cleanup_module(void)
{}
#endif /* MODULE */
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(fbcon_ilbm);
EXPORT_SYMBOL(fbcon_ilbm_setup);
EXPORT_SYMBOL(fbcon_ilbm_bmove);
EXPORT_SYMBOL(fbcon_ilbm_clear);
EXPORT_SYMBOL(fbcon_ilbm_putc);
EXPORT_SYMBOL(fbcon_ilbm_putcs);
EXPORT_SYMBOL(fbcon_ilbm_revc);
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