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libtdevnc/cursor.c

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/*
* cursor.c - support for cursor shape updates.
*/
/*
* Copyright (C) 2000, 2001 Const Kaplinsky. All Rights Reserved.
* 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 "rfb.h"
/*
* Send cursor shape either in X-style format or in client pixel format.
*/
Bool
rfbSendCursorShape(cl)
rfbClientPtr cl;
{
rfbCursorPtr pCursor;
rfbFramebufferUpdateRectHeader rect;
rfbXCursorColors colors;
int saved_ublen;
int bitmapRowBytes, maskBytes, dataBytes;
int i, j;
CARD8 *bitmapData;
CARD8 bitmapByte;
pCursor = cl->screen->getCursorPtr(cl);
if (cl->useRichCursorEncoding) {
if(!pCursor->richSource)
MakeRichCursorFromXCursor(cl->screen,pCursor);
rect.encoding = Swap32IfLE(rfbEncodingRichCursor);
} else {
if(!pCursor->source)
MakeXCursorFromRichCursor(cl->screen,pCursor);
rect.encoding = Swap32IfLE(rfbEncodingXCursor);
}
/* If there is no cursor, send update with empty cursor data. */
if ( pCursor->width == 1 &&
pCursor->height == 1 &&
pCursor->mask[0] == 0 ) {
pCursor = NULL;
}
if (pCursor == NULL) {
if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE ) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rect.r.x = rect.r.y = 0;
rect.r.w = rect.r.h = 0;
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
cl->rfbCursorBytesSent += sz_rfbFramebufferUpdateRectHeader;
cl->rfbCursorUpdatesSent++;
if (!rfbSendUpdateBuf(cl))
return FALSE;
return TRUE;
}
/* Calculate data sizes. */
bitmapRowBytes = (pCursor->width + 7) / 8;
maskBytes = bitmapRowBytes * pCursor->height;
dataBytes = (cl->useRichCursorEncoding) ?
(pCursor->width * pCursor->height *
(cl->format.bitsPerPixel / 8)) : maskBytes;
/* Send buffer contents if needed. */
if ( cl->ublen + sz_rfbFramebufferUpdateRectHeader +
sz_rfbXCursorColors + maskBytes + dataBytes > UPDATE_BUF_SIZE ) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
if ( cl->ublen + sz_rfbFramebufferUpdateRectHeader +
sz_rfbXCursorColors + maskBytes + dataBytes > UPDATE_BUF_SIZE ) {
return FALSE; /* FIXME. */
}
saved_ublen = cl->ublen;
/* Prepare rectangle header. */
rect.r.x = Swap16IfLE(pCursor->xhot);
rect.r.y = Swap16IfLE(pCursor->yhot);
rect.r.w = Swap16IfLE(pCursor->width);
rect.r.h = Swap16IfLE(pCursor->height);
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
/* Prepare actual cursor data (depends on encoding used). */
if (!cl->useRichCursorEncoding) {
/* XCursor encoding. */
colors.foreRed = (char)(pCursor->foreRed >> 8);
colors.foreGreen = (char)(pCursor->foreGreen >> 8);
colors.foreBlue = (char)(pCursor->foreBlue >> 8);
colors.backRed = (char)(pCursor->backRed >> 8);
colors.backGreen = (char)(pCursor->backGreen >> 8);
colors.backBlue = (char)(pCursor->backBlue >> 8);
memcpy(&cl->updateBuf[cl->ublen], (char *)&colors, sz_rfbXCursorColors);
cl->ublen += sz_rfbXCursorColors;
bitmapData = (CARD8 *)pCursor->source;
for (i = 0; i < pCursor->height; i++) {
for (j = 0; j < bitmapRowBytes; j++) {
bitmapByte = bitmapData[i * bitmapRowBytes + j];
/*if (screenInfo.bitmapBitOrder == LSBFirst) {
bitmapByte = _reverse_byte[bitmapByte];
}*/
cl->updateBuf[cl->ublen++] = (char)bitmapByte;
}
}
} else {
/* RichCursor encoding. */
int bpp1=cl->screen->rfbServerFormat.bitsPerPixel/8,
bpp2=cl->format.bitsPerPixel/8;
(*cl->translateFn)(cl->translateLookupTable,
&(cl->screen->rfbServerFormat),
&cl->format, pCursor->richSource,
&cl->updateBuf[cl->ublen],
pCursor->width*bpp1, pCursor->width, pCursor->height);
cl->ublen += pCursor->width*bpp2*pCursor->height;
}
/* Prepare transparency mask. */
bitmapData = (CARD8 *)pCursor->mask;
for (i = 0; i < pCursor->height; i++) {
for (j = 0; j < bitmapRowBytes; j++) {
bitmapByte = bitmapData[i * bitmapRowBytes + j];
/*if (screenInfo.bitmapBitOrder == LSBFirst) {
bitmapByte = _reverse_byte[bitmapByte];
}*/
cl->updateBuf[cl->ublen++] = (char)bitmapByte;
}
}
/* Send everything we have prepared in the cl->updateBuf[]. */
cl->rfbCursorBytesSent += (cl->ublen - saved_ublen);
cl->rfbCursorUpdatesSent++;
if (!rfbSendUpdateBuf(cl))
return FALSE;
return TRUE;
}
/* conversion routine for predefined cursors in LSB order */
static unsigned char _reverse_byte[0x100] = {
/* copied from Xvnc/lib/font/util/utilbitmap.c */
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
void rfbConvertLSBCursorBitmapOrMask(int width,int height,unsigned char* bitmap)
{
int i,t=(width+7)/8*height;
for(i=0;i<t;i++)
bitmap[i]=_reverse_byte[(int)bitmap[i]];
}
/* Cursor creation. You "paint" a cursor and let these routines do the work */
rfbCursorPtr rfbMakeXCursor(int width,int height,char* cursorString,char* maskString)
{
int i,j,w=(width+7)/8;
rfbCursorPtr cursor = (rfbCursorPtr)calloc(1,sizeof(rfbCursor));
char* cp;
unsigned char bit;
cursor->width=width;
cursor->height=height;
//cursor->backRed=cursor->backGreen=cursor->backBlue=0xffff;
cursor->foreRed=cursor->foreGreen=cursor->foreBlue=0xffff;
cursor->source = (char*)calloc(w,height);
for(j=0,cp=cursorString;j<height;j++)
for(i=0,bit=0x80;i<width;i++,bit=(bit&1)?0x80:bit>>1,cp++)
if(*cp!=' ') cursor->source[j*w+i/8]|=bit;
if(maskString) {
cursor->mask = (char*)calloc(w,height);
for(j=0,cp=maskString;j<height;j++)
for(i=0,bit=0x80;i<width;i++,bit=(bit&1)?0x80:bit>>1,cp++)
if(*cp!=' ') cursor->mask[j*w+i/8]|=bit;
} else
cursor->mask = rfbMakeMaskForXCursor(width,height,cursor->source);
return(cursor);
}
char* rfbMakeMaskForXCursor(int width,int height,char* source)
{
int i,j,w=(width+7)/8;
char* mask=(char*)calloc(w,height);
unsigned char c;
for(j=0;j<height;j++)
for(i=w-1;i>=0;i--) {
c=source[j*w+i];
if(j>0) c|=source[(j-1)*w+i];
if(j<height-1) c|=source[(j+1)*w+i];
if(i>0 && (c&0x80))
mask[j*w+i-1]|=0x01;
if(i<w-1 && (c&0x01))
mask[j*w+i+1]|=0x80;
mask[j*w+i]|=(c<<1)|c|(c>>1);
}
return(mask);
}
void rfbFreeCursor(rfbCursorPtr cursor)
{
if(cursor) {
free(cursor->source);
free(cursor->mask);
free(cursor);
}
}
/* background and foregroud colour have to be set beforehand */
void MakeXCursorFromRichCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
rfbPixelFormat* format=&rfbScreen->rfbServerFormat;
int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8,
width=cursor->width*bpp;
CARD32 background;
char *back=(char*)&background;
unsigned char bit;
cursor->source=(char*)calloc(w,cursor->height);
if(format->bigEndian)
back+=4-bpp;
background=cursor->backRed<<format->redShift|
cursor->backGreen<<format->greenShift|cursor->backBlue<<format->blueShift;
for(j=0;j<cursor->height;j++)
for(i=0,bit=0x80;i<cursor->width;i++,bit=(bit&1)?0x80:bit>>1)
if(memcmp(cursor->richSource+j*width+i*bpp,back,bpp))
cursor->source[j*w+i/8]|=bit;
}
void MakeRichCursorFromXCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
rfbPixelFormat* format=&rfbScreen->rfbServerFormat;
int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8;
CARD32 background,foreground;
char *cp,*back=(char*)&background,*fore=(char*)&foreground;
unsigned char bit;
cp=cursor->richSource=(char*)calloc(cursor->width*bpp,cursor->height);
if(format->bigEndian) {
back+=4-bpp;
fore+=4-bpp;
}
background=cursor->backRed<<format->redShift|
cursor->backGreen<<format->greenShift|cursor->backBlue<<format->blueShift;
foreground=cursor->foreRed<<format->redShift|
cursor->foreGreen<<format->greenShift|cursor->foreBlue<<format->blueShift;
for(j=0;j<cursor->height;j++)
for(i=0,bit=0x80;i<cursor->height;i++,bit=(bit&1)?0x80:bit>>1,cp+=bpp)
if(cursor->source[j*w+i/8]&bit) memcpy(cp,fore,bpp);
else memcpy(cp,back,bpp);
}
/* functions to draw/hide cursor directly in the frame buffer */
void rfbUndrawCursor(rfbClientPtr cl)
{
rfbScreenInfoPtr s=cl->screen;
rfbCursorPtr c=s->cursor;
int j,x1,x2,y1,y2,bpp=s->rfbServerFormat.bitsPerPixel/8,
rowstride=s->paddedWidthInBytes;
if(!s->cursorIsDrawn)
return;
/* restore what is under the cursor */
x1=s->cursorX-c->xhot;
x2=x1+c->width;
if(x1<0) x1=0;
if(x2>=s->width) x2=s->width-1;
x2-=x1;
y1=s->cursorY-c->yhot;
y2=y1+c->height;
if(y1<0) y1=0;
if(y2>=s->height) y2=s->height-1;
y2-=y1;
for(j=0;j<y2;j++)
memcpy(s->frameBuffer+(y1+j)*rowstride+x1*bpp,
s->underCursorBuffer+j*x2*bpp,
x2*bpp);
rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
s->cursorIsDrawn = FALSE;
}
void rfbDrawCursor(rfbClientPtr cl)
{
rfbScreenInfoPtr s=cl->screen;
rfbCursorPtr c=s->cursor;
int i,j,x1,x2,y1,y2,i1,j1,bpp=s->rfbServerFormat.bitsPerPixel/8,
rowstride=s->paddedWidthInBytes,
bufSize=c->width*c->height*bpp,w=(c->width+7)/8;
if(s->cursorIsDrawn)
rfbUndrawCursor(cl);
if(s->underCursorBufferLen<bufSize) {
if(s->underCursorBuffer!=NULL)
free(s->underCursorBuffer);
s->underCursorBuffer=malloc(bufSize);
s->underCursorBufferLen=bufSize;
}
/* save what is under the cursor */
i1=j1=0; /* offset in cursor */
x1=s->cursorX-c->xhot;
x2=x1+c->width;
if(x1<0) { i1=-x1; x1=0; }
if(x2>=s->width) x2=s->width-1;
x2-=x1; if(x2<=0) return; /* nothing to do */
y1=s->cursorY-c->yhot;
y2=y1+c->height;
if(y1<0) { j1=-y1; y1=0; }
if(y2>=s->height) y2=s->height-1;
y2-=y1; if(y2<=0) return; /* nothing to do */
for(j=0;j<y2;j++)
memcpy(s->underCursorBuffer+j*x2*bpp,
s->frameBuffer+(y1+j)*rowstride+x1*bpp,
x2*bpp);
if(!c->richSource)
MakeRichCursorFromXCursor(s,c);
/* now the cursor has to be drawn */
for(j=0;j<y2;j++)
for(i=0;i<x2;i++)
if((c->mask[(j+j1)*w+(i+i1)/8]<<((i+i1)&7))&0x80)
memcpy(s->frameBuffer+(j+y1)*rowstride+(i+x1)*bpp,
c->richSource+(j+j1)*c->width*bpp+(i+i1)*bpp,bpp);
rfbMarkRectAsModified(s,x1,y1,x1+x2,y1+y2);
s->cursorIsDrawn = TRUE;
}
/* for debugging */
void rfbPrintXCursor(rfbCursorPtr cursor)
{
int i,i1,j,w=(cursor->width+7)/8;
unsigned char bit;
for(j=0;j<cursor->height;j++) {
for(i=0,i1=0,bit=0x80;i1<cursor->width;i1++,i+=(bit&1)?1:0,bit=(bit&1)?0x80:bit>>1)
if(cursor->source[j*w+i]&bit) putchar('#'); else putchar(' ');
putchar(':');
for(i=0,i1=0,bit=0x80;i1<cursor->width;i1++,i+=(bit&1)?1:0,bit=(bit&1)?0x80:bit>>1)
if(cursor->mask[j*w+i]&bit) putchar('#'); else putchar(' ');
putchar('\n');
}
}
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