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#define CONCAT_I(a, b) a ## b
#define CONCAT(a, b) CONCAT_I(a, b)
#define pixel_t CONCAT(uint, CONCAT(BPP, _t))
#ifdef GENERIC
#define NAME CONCAT(generic_, BPP)
#else
#define NAME BPP
#endif

static void CONCAT(send_hextile_tile_, NAME)(VncState *vs,
                                             int x, int y, int w, int h,
                                             void *last_bg_,
                                             void *last_fg_,
                                             int *has_bg, int *has_fg)
{
    VncDisplay *vd = vs->vd;
    uint8_t *row = vd->server->data + y * ds_get_linesize(vs->ds) + x * ds_get_bytes_per_pixel(vs->ds);
    pixel_t *irow = (pixel_t *)row;
    int j, i;
    pixel_t *last_bg = (pixel_t *)last_bg_;
    pixel_t *last_fg = (pixel_t *)last_fg_;
    pixel_t bg = 0;
    pixel_t fg = 0;
    int n_colors = 0;
    int bg_count = 0;
    int fg_count = 0;
    int flags = 0;
    uint8_t data[(vs->clientds.pf.bytes_per_pixel + 2) * 16 * 16];
    int n_data = 0;
    int n_subtiles = 0;

    for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
switch (n_colors) {
case 0:
bg = irow[i];
n_colors = 1;
break;
case 1:
if (irow[i] != bg) {
fg = irow[i];
n_colors = 2;
}
break;
case 2:
if (irow[i] != bg && irow[i] != fg) {
n_colors = 3;
} else {
if (irow[i] == bg)
bg_count++;
else if (irow[i] == fg)
fg_count++;
}
break;
default:
break;
}
}
if (n_colors > 2)
break;
irow += ds_get_linesize(vs->ds) / sizeof(pixel_t);
    }

    if (n_colors > 1 && fg_count > bg_count) {
pixel_t tmp = fg;
fg = bg;
bg = tmp;
    }

    if (!*has_bg || *last_bg != bg) {
flags |= 0x02;
*has_bg = 1;
*last_bg = bg;
    }

    if (n_colors < 3 && (!*has_fg || *last_fg != fg)) {
flags |= 0x04;
*has_fg = 1;
*last_fg = fg;
    }

    switch (n_colors) {
    case 1:
n_data = 0;
break;
    case 2:
flags |= 0x08;

irow = (pixel_t *)row;

for (j = 0; j < h; j++) {
int min_x = -1;
for (i = 0; i < w; i++) {
if (irow[i] == fg) {
if (min_x == -1)
min_x = i;
} else if (min_x != -1) {
hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
n_data += 2;
n_subtiles++;
min_x = -1;
}
}
if (min_x != -1) {
hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
n_data += 2;
n_subtiles++;
}
irow += ds_get_linesize(vs->ds) / sizeof(pixel_t);
}
break;
    case 3:
flags |= 0x18;

irow = (pixel_t *)row;

if (!*has_bg || *last_bg != bg)
flags |= 0x02;

for (j = 0; j < h; j++) {
int has_color = 0;
int min_x = -1;
pixel_t color = 0; /* shut up gcc */

for (i = 0; i < w; i++) {
if (!has_color) {
if (irow[i] == bg)
continue;
color = irow[i];
min_x = i;
has_color = 1;
} else if (irow[i] != color) {
has_color = 0;
#ifdef GENERIC
                    vnc_convert_pixel(vs, data + n_data, color);
                    n_data += vs->clientds.pf.bytes_per_pixel;
#else
memcpy(data + n_data, &color, sizeof(color));
                    n_data += sizeof(pixel_t);
#endif
hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
n_data += 2;
n_subtiles++;

min_x = -1;
if (irow[i] != bg) {
color = irow[i];
min_x = i;
has_color = 1;
}
}
}
if (has_color) {
#ifdef GENERIC
                vnc_convert_pixel(vs, data + n_data, color);
                n_data += vs->clientds.pf.bytes_per_pixel;
#else
                memcpy(data + n_data, &color, sizeof(color));
                n_data += sizeof(pixel_t);
#endif
hextile_enc_cord(data + n_data, min_x, j, i - min_x, 1);
n_data += 2;
n_subtiles++;
}
irow += ds_get_linesize(vs->ds) / sizeof(pixel_t);
}

/* A SubrectsColoured subtile invalidates the foreground color */
*has_fg = 0;
if (n_data > (w * h * sizeof(pixel_t))) {
n_colors = 4;
flags = 0x01;
*has_bg = 0;

/* we really don't have to invalidate either the bg or fg
but we've lost the old values. oh well. */
}
    default:
break;
    }

    if (n_colors > 3) {
flags = 0x01;
*has_fg = 0;
*has_bg = 0;
n_colors = 4;
    }

    vnc_write_u8(vs, flags);
    if (n_colors < 4) {
if (flags & 0x02)
vs->write_pixels(vs, &vd->server->pf, last_bg, sizeof(pixel_t));
if (flags & 0x04)
vs->write_pixels(vs, &vd->server->pf, last_fg, sizeof(pixel_t));
if (n_subtiles) {
vnc_write_u8(vs, n_subtiles);
vnc_write(vs, data, n_data);
}
    } else {
for (j = 0; j < h; j++) {
vs->write_pixels(vs, &vd->server->pf, row,
                             w * ds_get_bytes_per_pixel(vs->ds));
row += ds_get_linesize(vs->ds);
}
    }
}

#undef NAME
#undef pixel_t
#undef CONCAT_I
#undef CONCAT
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