aafastre.c

#include <stdio.h>
#include "aalib.h"
#include "aamktabl.h"
void aa_fastrender(aa_context * c, int x1, int y1, int x2, int y2)
{
    int x, y;
    int val;
    int wi = c->imgwidth;
    int pos;
    int pos1;
    if (x2 < 0 || y2 < 0 || x1 > aa_scrwidth(c) || y1 > aa_scrheight(c))
    return;
    if (x2 >= aa_scrwidth(c))
    x2 = aa_scrwidth(c);
    if (y2 >= aa_scrheight(c))
    y2 = aa_scrheight(c);
    if (x1 < 0)
    x1 = 0;
    if (y1 < 0)
    y1 = 0;
    if (c->table == NULL)
    aa_mktable(c);
    for (y = y1; y < y2; y++) {
    pos = 2 * y * wi;
    pos1 = y * aa_scrwidth(c);
    for (x = x1; x < x2; x++) {
        val = c->table[
                  ((((int) c->imagebuffer[pos] >> 4)) << 8) +
             ((((int) c->imagebuffer[pos + 1] >> 4)) << 12) +
                  ((((int) c->imagebuffer[pos + wi] >> 4))) +
             ((((int) c->imagebuffer[pos + 1 + wi] >> 4)) << 4)];
        c->attrbuffer[pos1] = val >> 8;
        c->textbuffer[pos1] = val & 0xff;
        pos += 2;
        pos1++;
    }
    }
}