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libtdevnc/translate.c

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/*
* translate.c - translate between different pixel formats
*/
/*
* OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
* Original Xvnc code 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include "rfb.h"
#include "sraRegion.h"
static void PrintPixelFormat(rfbPixelFormat *pf);
static Bool rfbSetClientColourMapBGR233();
Bool rfbEconomicTranslate = FALSE;
/*
* Some standard pixel formats.
*/
static const rfbPixelFormat BGR233Format = {
8, 8, 0, 1, 7, 7, 3, 0, 3, 6
};
/*
* Macro to compare pixel formats.
*/
#define PF_EQ(x,y) \
((x.bitsPerPixel == y.bitsPerPixel) && \
(x.depth == y.depth) && \
((x.bigEndian == y.bigEndian) || (x.bitsPerPixel == 8)) && \
(x.trueColour == y.trueColour) && \
(!x.trueColour || ((x.redMax == y.redMax) && \
(x.greenMax == y.greenMax) && \
(x.blueMax == y.blueMax) && \
(x.redShift == y.redShift) && \
(x.greenShift == y.greenShift) && \
(x.blueShift == y.blueShift))))
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#define CONCAT4(a,b,c,d) a##b##c##d
#define CONCAT4E(a,b,c,d) CONCAT4(a,b,c,d)
#define OUT 8
#include "tableinitcmtemplate.c"
#include "tableinittctemplate.c"
#define IN 8
#include "tabletranstemplate.c"
#undef IN
#define IN 16
#include "tabletranstemplate.c"
#undef IN
#define IN 32
#include "tabletranstemplate.c"
#undef IN
#undef OUT
#define OUT 16
#include "tableinitcmtemplate.c"
#include "tableinittctemplate.c"
#define IN 8
#include "tabletranstemplate.c"
#undef IN
#define IN 16
#include "tabletranstemplate.c"
#undef IN
#define IN 32
#include "tabletranstemplate.c"
#undef IN
#undef OUT
#define OUT 32
#include "tableinitcmtemplate.c"
#include "tableinittctemplate.c"
#define IN 8
#include "tabletranstemplate.c"
#undef IN
#define IN 16
#include "tabletranstemplate.c"
#undef IN
#define IN 32
#include "tabletranstemplate.c"
#undef IN
#undef OUT
#ifdef ALLOW24BPP
#define COUNT_OFFSETS 4
#define BPP2OFFSET(bpp) ((bpp)/8-1)
#include "tableinit24.c"
#define BPP 8
#include "tabletrans24template.c"
#undef BPP
#define BPP 16
#include "tabletrans24template.c"
#undef BPP
#define BPP 24
#include "tabletrans24template.c"
#undef BPP
#define BPP 32
#include "tabletrans24template.c"
#undef BPP
#else
#define COUNT_OFFSETS 3
#define BPP2OFFSET(bpp) ((int)(bpp)/16)
#endif
typedef void (*rfbInitCMTableFnType)(char **table, rfbPixelFormat *in,
rfbPixelFormat *out,rfbColourMap* cm);
typedef void (*rfbInitTableFnType)(char **table, rfbPixelFormat *in,
rfbPixelFormat *out);
rfbInitCMTableFnType rfbInitColourMapSingleTableFns[COUNT_OFFSETS] = {
rfbInitColourMapSingleTable8,
rfbInitColourMapSingleTable16,
#ifdef ALLOW24BPP
rfbInitColourMapSingleTable24,
#endif
rfbInitColourMapSingleTable32
};
rfbInitTableFnType rfbInitTrueColourSingleTableFns[COUNT_OFFSETS] = {
rfbInitTrueColourSingleTable8,
rfbInitTrueColourSingleTable16,
#ifdef ALLOW24BPP
rfbInitTrueColourSingleTable24,
#endif
rfbInitTrueColourSingleTable32
};
rfbInitTableFnType rfbInitTrueColourRGBTablesFns[COUNT_OFFSETS] = {
rfbInitTrueColourRGBTables8,
rfbInitTrueColourRGBTables16,
#ifdef ALLOW24BPP
rfbInitTrueColourRGBTables24,
#endif
rfbInitTrueColourRGBTables32
};
rfbTranslateFnType rfbTranslateWithSingleTableFns[COUNT_OFFSETS][COUNT_OFFSETS] = {
{ rfbTranslateWithSingleTable8to8,
rfbTranslateWithSingleTable8to16,
#ifdef ALLOW24BPP
rfbTranslateWithSingleTable8to24,
#endif
rfbTranslateWithSingleTable8to32 },
{ rfbTranslateWithSingleTable16to8,
rfbTranslateWithSingleTable16to16,
#ifdef ALLOW24BPP
rfbTranslateWithSingleTable16to24,
#endif
rfbTranslateWithSingleTable16to32 },
#ifdef ALLOW24BPP
{ rfbTranslateWithSingleTable24to8,
rfbTranslateWithSingleTable24to16,
rfbTranslateWithSingleTable24to24,
rfbTranslateWithSingleTable24to32 },
#endif
{ rfbTranslateWithSingleTable32to8,
rfbTranslateWithSingleTable32to16,
#ifdef ALLOW24BPP
rfbTranslateWithSingleTable32to24,
#endif
rfbTranslateWithSingleTable32to32 }
};
rfbTranslateFnType rfbTranslateWithRGBTablesFns[COUNT_OFFSETS][COUNT_OFFSETS] = {
{ rfbTranslateWithRGBTables8to8,
rfbTranslateWithRGBTables8to16,
#ifdef ALLOW24BPP
rfbTranslateWithRGBTables8to24,
#endif
rfbTranslateWithRGBTables8to32 },
{ rfbTranslateWithRGBTables16to8,
rfbTranslateWithRGBTables16to16,
#ifdef ALLOW24BPP
rfbTranslateWithRGBTables16to24,
#endif
rfbTranslateWithRGBTables16to32 },
#ifdef ALLOW24BPP
{ rfbTranslateWithRGBTables24to8,
rfbTranslateWithRGBTables24to16,
rfbTranslateWithRGBTables24to24,
rfbTranslateWithRGBTables24to32 },
#endif
{ rfbTranslateWithRGBTables32to8,
rfbTranslateWithRGBTables32to16,
#ifdef ALLOW24BPP
rfbTranslateWithRGBTables32to24,
#endif
rfbTranslateWithRGBTables32to32 }
};
/*
* rfbTranslateNone is used when no translation is required.
*/
void
rfbTranslateNone(char *table, rfbPixelFormat *in, rfbPixelFormat *out,
char *iptr, char *optr, int bytesBetweenInputLines,
int width, int height)
{
int bytesPerOutputLine = width * (out->bitsPerPixel / 8);
while (height > 0) {
memcpy(optr, iptr, bytesPerOutputLine);
iptr += bytesBetweenInputLines;
optr += bytesPerOutputLine;
height--;
}
}
/*
* rfbSetTranslateFunction sets the translation function.
*/
Bool
rfbSetTranslateFunction(cl)
rfbClientPtr cl;
{
rfbLog("Pixel format for client %s:\n",cl->host);
PrintPixelFormat(&cl->format);
/*
* Check that bits per pixel values are valid
*/
if ((cl->screen->rfbServerFormat.bitsPerPixel != 8) &&
(cl->screen->rfbServerFormat.bitsPerPixel != 16) &&
#ifdef ALLOW24BPP
(cl->screen->rfbServerFormat.bitsPerPixel != 24) &&
#endif
(cl->screen->rfbServerFormat.bitsPerPixel != 32))
{
rfbLog("%s: server bits per pixel not 8, 16 or 32\n",
"rfbSetTranslateFunction");
rfbCloseClient(cl);
return FALSE;
}
if ((cl->format.bitsPerPixel != 8) &&
(cl->format.bitsPerPixel != 16) &&
#ifdef ALLOW24BPP
(cl->format.bitsPerPixel != 24) &&
#endif
(cl->format.bitsPerPixel != 32))
{
rfbLog("%s: client bits per pixel not 8, 16 or 32\n",
"rfbSetTranslateFunction");
rfbCloseClient(cl);
return FALSE;
}
if (!cl->format.trueColour && (cl->format.bitsPerPixel != 8)) {
rfbLog("rfbSetTranslateFunction: client has colour map "
"but %d-bit - can only cope with 8-bit colour maps\n",
cl->format.bitsPerPixel);
rfbCloseClient(cl);
return FALSE;
}
/*
* bpp is valid, now work out how to translate
*/
if (!cl->format.trueColour) {
/*
* truecolour -> colour map
*
* Set client's colour map to BGR233, then effectively it's
* truecolour as well
*/
if (!rfbSetClientColourMapBGR233(cl))
return FALSE;
cl->format = BGR233Format;
}
/* truecolour -> truecolour */
if (PF_EQ(cl->format,cl->screen->rfbServerFormat)) {
/* client & server the same */
rfbLog("no translation needed\n");
cl->translateFn = rfbTranslateNone;
return TRUE;
}
if ((cl->screen->rfbServerFormat.bitsPerPixel < 16) ||
((!cl->screen->rfbServerFormat.trueColour || !rfbEconomicTranslate) &&
(cl->screen->rfbServerFormat.bitsPerPixel == 16))) {
/* we can use a single lookup table for <= 16 bpp */
cl->translateFn = rfbTranslateWithSingleTableFns
[BPP2OFFSET(cl->screen->rfbServerFormat.bitsPerPixel)]
[BPP2OFFSET(cl->format.bitsPerPixel)];
if(cl->screen->rfbServerFormat.trueColour)
(*rfbInitTrueColourSingleTableFns
[BPP2OFFSET(cl->format.bitsPerPixel)]) (&cl->translateLookupTable,
&(cl->screen->rfbServerFormat), &cl->format);
else
(*rfbInitColourMapSingleTableFns
[BPP2OFFSET(cl->format.bitsPerPixel)]) (&cl->translateLookupTable,
&(cl->screen->rfbServerFormat), &cl->format,&cl->screen->colourMap);
} else {
/* otherwise we use three separate tables for red, green and blue */
cl->translateFn = rfbTranslateWithRGBTablesFns
[BPP2OFFSET(cl->screen->rfbServerFormat.bitsPerPixel)]
[BPP2OFFSET(cl->format.bitsPerPixel)];
(*rfbInitTrueColourRGBTablesFns
[BPP2OFFSET(cl->format.bitsPerPixel)]) (&cl->translateLookupTable,
&(cl->screen->rfbServerFormat), &cl->format);
}
return TRUE;
}
/*
* rfbSetClientColourMapBGR233 sets the client's colour map so that it's
* just like an 8-bit BGR233 true colour client.
*/
static Bool
rfbSetClientColourMapBGR233(cl)
rfbClientPtr cl;
{
char buf[sz_rfbSetColourMapEntriesMsg + 256 * 3 * 2];
rfbSetColourMapEntriesMsg *scme = (rfbSetColourMapEntriesMsg *)buf;
CARD16 *rgb = (CARD16 *)(&buf[sz_rfbSetColourMapEntriesMsg]);
int i, len;
int r, g, b;
if (cl->format.bitsPerPixel != 8 ) {
rfbLog("%s: client not 8 bits per pixel\n",
"rfbSetClientColourMapBGR233");
rfbCloseClient(cl);
return FALSE;
}
scme->type = rfbSetColourMapEntries;
scme->firstColour = Swap16IfLE(0);
scme->nColours = Swap16IfLE(256);
len = sz_rfbSetColourMapEntriesMsg;
i = 0;
for (b = 0; b < 4; b++) {
for (g = 0; g < 8; g++) {
for (r = 0; r < 8; r++) {
rgb[i++] = Swap16IfLE(r * 65535 / 7);
rgb[i++] = Swap16IfLE(g * 65535 / 7);
rgb[i++] = Swap16IfLE(b * 65535 / 3);
}
}
}
len += 256 * 3 * 2;
if (WriteExact(cl, buf, len) < 0) {
rfbLogPerror("rfbSetClientColourMapBGR233: write");
rfbCloseClient(cl);
return FALSE;
}
return TRUE;
}
/* this function is not called very often, so it needn't be
efficient. */
/*
* rfbSetClientColourMap is called to set the client's colour map. If the
* client is a true colour client, we simply update our own translation table
* and mark the whole screen as having been modified.
*/
Bool
rfbSetClientColourMap(cl, firstColour, nColours)
rfbClientPtr cl;
int firstColour;
int nColours;
{
if (cl->screen->rfbServerFormat.trueColour || !cl->readyForSetColourMapEntries) {
return TRUE;
}
if (nColours == 0) {
nColours = cl->screen->colourMap.count;
}
if (cl->format.trueColour) {
(*rfbInitColourMapSingleTableFns
[BPP2OFFSET(cl->format.bitsPerPixel)]) (&cl->translateLookupTable,
&cl->screen->rfbServerFormat, &cl->format,&cl->screen->colourMap);
sraRgnDestroy(cl->modifiedRegion);
cl->modifiedRegion =
sraRgnCreateRect(0,0,cl->screen->width,cl->screen->height);
return TRUE;
}
return rfbSendSetColourMapEntries(cl, firstColour, nColours);
}
/*
* rfbSetClientColourMaps sets the colour map for each RFB client.
*/
void
rfbSetClientColourMaps(rfbScreen, firstColour, nColours)
rfbScreenInfoPtr rfbScreen;
int firstColour;
int nColours;
{
rfbClientPtr cl, nextCl;
for (cl = rfbScreen->rfbClientHead; cl; cl = nextCl) {
nextCl = cl->next;
rfbSetClientColourMap(cl, firstColour, nColours);
}
}
static void
PrintPixelFormat(pf)
rfbPixelFormat *pf;
{
if (pf->bitsPerPixel == 1) {
rfbLog(" 1 bpp, %s sig bit in each byte is leftmost on the screen.\n",
(pf->bigEndian ? "most" : "least"));
} else {
rfbLog(" %d bpp, depth %d%s\n",pf->bitsPerPixel,pf->depth,
((pf->bitsPerPixel == 8) ? ""
: (pf->bigEndian ? ", big endian" : ", little endian")));
if (pf->trueColour) {
rfbLog(" true colour: max r %d g %d b %d, shift r %d g %d b %d\n",
pf->redMax, pf->greenMax, pf->blueMax,
pf->redShift, pf->greenShift, pf->blueShift);
} else {
rfbLog(" uses a colour map (not true colour).\n");
}
}
}
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