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hextile8
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2002-03-10
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/*
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* hextile.c - handle hextile encoding.
*
* This file shouldn't be compiled directly. It is included multiple times by
* rfbproto.c, each time with a different definition of the macro BPP. For
* each value of BPP, this file defines a function which handles a hextile
* encoded rectangle with BPP bits per pixel.
*/
/*
* alternative hextile coding of 16x16 pixels rectangle
* flag byte followed by optional data
* flag byte:
* bit 0 set bg colour included
* bit 1..3 coding type
* 0 hextile
* 1 raw
* bit 4 set 1x1 data included (hextile coding)
* bit 5 set 1x2 data included (hextile coding)
* bit 6 set 2x1 data included (hextile coding)
* bit 7 set any size rectangle data included (hextile coding)
* bit 4..6 no. of bits per pixel (raw coding)
* 0 native
* 1 1bpp with palette
* 2 2bpp with palette
* 3 4bpp with palette
* 4 6bpp RGB222
* 5 8bpp RGB332
*
* if bit 0 set, first data byte(s) holds new bgcolour
* if hextile coding is used, 1x1 data comes first (if any), then 1x2 etc.
*
* 1x1 data:
* byte 0 1x1 status byte
* bit 0 set first data byte(s) holds new fg colour
* bit 1 set there's another 1x1 status byte after the data
* bit 2..7 no. of subrectangles - 1
* followed by 4 bit X and 4 bit Y coordinates for each 1x1 rectangle
* 1x2 data:
* byte 0 1x2 status byte
* bit 0 set first data byte(s) holds new fg colour
* bit 1 set there's another 1x2 status byte after the data
* bit 2..7 no. of sub rectangles - 1
* followed by 4 bit X and 4 bit Y coordinates for each 1x2 rectangle
* 2x1 data:
* byte 0 2x1 status byte
* bit 0 set first data byte(s) holds new fg colour
* bit 1 set there's another 2x1 status byte after the data
* bit 2..7 no. of sub rectangles - 1
* followed by 4 bit X and 4 bit Y coordinates for each 2x1 rectangle
* any size rectangle data:
* byte 0 status byte
* bit 0 set first data byte(s) holds new fg colour
* bit 1 set there's another status byte after the data
* bit 2..7 no. of sub rectangles - 1
* followed by 4 bit X and 4 bit Y coordinates and 4 bit
* width and 4 bit height for each rectangle
* raw coding:
* followed by palette (if bpp = 1, 2 or 4)
* followed by raw data
*
* How to:
* 1) modify testColours() to count the no. of colours (bad idea for > 8bpp):
* if (!(colourmask[*data>>3] & (1<<(*data &7))))
* ncolours++;
* colourmask[*data>>3] |= (1<<(*data &7))
* 2) find subrectangles as usual but store differently
* if (thew==1 && theh==1)
* *subrects_1x1++ = rfbHextilePackXY(thex, they)
* *subrects_1x1++ = colour
* nsubrects_1x1++;
* estimated_size++;
* if (colour != prevcolour) prevcolour=colour, estimated_size++;
* likewise for 1x2, 2x1 and any size
* 3) when outputting hextile coded data:
* output all 1x1 then all 1x2 etc.
*/
static Bool HandleHextile8 (int rx, int ry, int rw, int rh)
{
CARD8 bg, fg;
int i;
CARD8 *ptr;
int x, y, w, h;
int sx, sy, sw, sh;
CARD8 subencoding;
CARD8 nSubrects;
for (y = ry; y < ry+rh; y += 16) {
for (x = rx; x < rx+rw; x += 16) {
w = h = 16;
if (rx+rw - x < 16)
w = rx+rw - x;
if (ry+rh - y < 16)
h = ry+rh - y;
if (!ReadFromRFBServer((char *)&subencoding, 1))
return False;
if (subencoding & rfbHextileRaw) {
if (!ReadFromRFBServer(buffer, w * h * (BPP / 8)))
return False;
display_raw(x, y, w, h, buffer, 0);
continue;
}
if (subencoding & rfbHextileBackgroundSpecified)
if (!ReadFromRFBServer((char *)&bg, sizeof(bg)))
return False;
display_fillrectangle(x, y, w, h, rgb332_rgb555_table[bg]);
if (subencoding & rfbHextileForegroundSpecified)
if (!ReadFromRFBServer((char *)&fg, sizeof(fg)))
return False;
if (!(subencoding & rfbHextileAnySubrects)) {
continue;
}
if (!ReadFromRFBServer((char *)&nSubrects, 1))
return False;
ptr = (CARD8 *)buffer;
if (subencoding & rfbHextileSubrectsColoured) {
if (!ReadFromRFBServer(buffer, nSubrects * (2 + (BPP / 8))))
return False;
subrect += nSubrects;
for (i = 0; i < nSubrects; i++) {
fg = ptr[0];
ptr += 1;
sx = rfbHextileExtractX(*ptr);
sy = rfbHextileExtractY(*ptr);
ptr++;
sw = rfbHextileExtractW(*ptr);
sh = rfbHextileExtractH(*ptr);
ptr++;
display_fillrectangle(x+sx, y+sy, sw, sh, rgb332_rgb555_table[fg]);
}
} else {
if (!ReadFromRFBServer(buffer, nSubrects * 2))
return False;
subrect += nSubrects;
for (i = 0; i < nSubrects; i++) {
sx = rfbHextileExtractX(*ptr);
sy = rfbHextileExtractY(*ptr);
ptr++;
sw = rfbHextileExtractW(*ptr);
sh = rfbHextileExtractH(*ptr);
ptr++;
display_fillrectangle(x+sx, y+sy, sw, sh, rgb332_rgb555_table[fg]);
}
}
}
}
return True;
}