diff options
Diffstat (limited to 'dblbuf.c')
| -rw-r--r-- | dblbuf.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/dblbuf.c b/dblbuf.c new file mode 100644 index 0000000..ad70576 --- /dev/null +++ b/dblbuf.c @@ -0,0 +1,220 @@ +/* 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; +} |