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/* uuterm, Copyright (C) 2006 Rich Felker; licensed under GNU GPL v2 only */
#include "uuterm.h"
#include "dblbuf.h"
#if 0
static void blitline8_crap(unsigned char *dest, unsigned char *src, unsigned char *colors, int w, int cw)
{
int cs = (cw+7)>>3;
int skip = (-cw)&7;
int x, i, j;
signed char b;
for (x=0; x<w; x++) {
j=skip;
b=*src++<<skip;
for (i=0; ; i++) {
for (; j<8; j++, b<<=1)
//*dest++ = 7 & (b>>7);
*dest++ = (*colors&15&(b>>7)) | (*colors>>4&~(b>>7));
if (i >= cs) break;
b=*src++;
j=0;
}
colors++;
}
}
static void blitline8_2(unsigned char *dest, unsigned char *src, unsigned char *colors, int w, int cw)
{
int cs = (cw+7)>>3;
int skip = (-cw)&7;
int x, i, j;
signed char b;
unsigned char fg, bg;
for (x=0; x<w; x++) {
j=skip;
b=*src++<<skip;
fg = *colors & 15;
bg = *colors++ >> 4;
for (i=0; ; i++) {
for (; j<8; j++, b<<=1)
*dest++ = (fg&(b>>7)) | (bg&~(b>>7));
if (i >= cs) break;
b=*src++;
j=0;
}
}
}
#endif
#ifdef HAVE_I386_ASM
#define BLIT_PIXEL_8 \
"add %%al,%%al \n\t" \
"sbb %%dl,%%dl \n\t" \
"and %%bh,%%dl \n\t" \
"mov %%bl,%%dh \n\t" \
"add %%dl,%%dh \n\t" \
"mov %%dh,(%%edi) \n\t" \
"inc %%edi \n\t" \
static void blitline8(unsigned char *dest, unsigned char *src, unsigned char *colors, int w, int cw)
{
__asm__ __volatile__(
"push %%ebp \n\t"
"mov %%ebx, %%ebp \n\t"
"\n1: \n\t"
"mov (%%esi), %%al \n\t"
"inc %%esi \n\t"
"mov (%%ecx), %%bl \n\t"
"inc %%ecx \n\t"
"mov %%bl, %%bh \n\t"
"shr $4, %%bl \n\t"
"and $15, %%bh \n\t"
"sub %%bl, %%bh \n\t"
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
BLIT_PIXEL_8
"dec %%ebp \n\t"
"jnz 1b \n\t"
"pop %%ebp \n\t"
: "=S"(src), "=D"(dest), "=c"(colors), "=b"(w)
: "S"(src), "D"(dest), "c"(colors), "b"(w)
: "memory" );
}
#else
static void blitline8(unsigned char *dest, unsigned char *src, unsigned char *colors, int w, int cw)
{
int x;
unsigned char b;
unsigned char c[2];
for (x=0; x<w; x++) {
b=*src++;
c[1] = *colors & 15;
c[0] = *colors++ >> 4;
dest[0] = c[b>>7]; b<<=1;
dest[1] = c[b>>7]; b<<=1;
dest[2] = c[b>>7]; b<<=1;
dest[3] = c[b>>7]; b<<=1;
dest[4] = c[b>>7]; b<<=1;
dest[5] = c[b>>7]; b<<=1;
dest[6] = c[b>>7]; b<<=1;
dest[7] = c[b>>7]; b<<=1;
dest += 8;
}
}
#endif
static void blit_slice(struct uudisp *d, int idx, int x1, int x2)
{
struct dblbuf *b = (void *)&d->priv;
int cs = (d->cell_w+7)>>3;
int y = b->slices[idx].y;
int w = x2 - x1 + 1;
int s = d->w * cs;
int i;
unsigned char *dest = b->vidmem + y*b->row_stride
+ x1*d->cell_w*b->bytes_per_pixel;
unsigned char *src = b->slices[idx].bitmap + x1*cs;
unsigned char *colors = b->slices[idx].colors + x1;
for (i=0; i<d->cell_h; i++) {
blitline8(dest, src, colors, w, d->cell_w);
dest += b->line_stride;
src += s;
}
}
void clear_cells(struct uudisp *d, int idx, int x1, int x2)
{
struct dblbuf *b = (void *)&d->priv;
int i;
int cs = d->cell_w+7 >> 3;
int cnt = (x2 - x1 + 1) * cs;
int stride = d->w * cs;
unsigned char *dest = b->slices[idx].bitmap + x1 * cs;
memset(b->slices[idx].colors + x1, 0, x2-x1+1);
for (i=d->cell_h; i; i--, dest += stride)
memset(dest, 0, cnt);
}
void uudisp_draw_glyph(struct uudisp *d, int idx, int x, const void *glyph, int color)
{
struct dblbuf *b = (void *)&d->priv;
int i;
int cs = d->cell_w+7 >> 3;
int stride = d->w * cs;
unsigned char *src = (void *)glyph;
unsigned char *dest = b->slices[idx].bitmap + cs * x;
b->slices[idx].colors[x] = color;
for (i=d->cell_h; i; i--, dest += stride)
*dest |= *src++;
}
void uudisp_refresh(struct uudisp *d, struct uuterm *t)
{
struct dblbuf *b = (void *)&d->priv;
int h = t->h < d->h ? t->h : d->h;
int y;
/* Clean up cursor first.. */
blit_slice(d, t->rows[b->curs_y]->idx, b->curs_x, b->curs_x);
//printf("--- %d\r\n", b->slices[t->rows[b->curs_y]->idx].y);
for (y=0; y<h; y++) {
int idx = t->rows[y]->idx;
int x1 = t->rows[y]->x1;
int x2 = t->rows[y]->x2;
if (x2 >= x1) {
clear_cells(d, idx, x1, x2);
uuterm_refresh_row(d, t->rows[y], x1, x2);
t->rows[y]->x1 = t->w;
t->rows[y]->x2 = -1;
}
if (b->slices[idx].y != y) {
b->slices[idx].y = y;
x1 = 0;
x2 = d->w-1;
} else if (x2 < x1) continue;
blit_slice(d, idx, x1, x2);
}
if (d->blink & 1) {
int idx = t->rows[t->y]->idx;
b->slices[idx].colors[t->x] ^= 0xff;
blit_slice(d, idx, t->x, t->x);
b->slices[idx].colors[t->x] ^= 0xff;
}
b->curs_x = t->x;
b->curs_y = t->y;
//printf("+++ %d\r\n", b->slices[t->rows[b->curs_y]->idx].y);
}
struct slice *dblbuf_setup_buf(int w, int h, int cs, int ch, unsigned char *mem)
{
struct slice *slices = (void *)mem;
int i;
mem += sizeof(slices[0]) * h;
for (i=0; i<h; i++, mem += w) {
slices[i].y = -1;
slices[i].colors = mem;
}
w *= cs * ch;
for (i=0; i<h; i++, mem += w)
slices[i].bitmap = mem;
return slices;
}
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