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libtdevnc/libvncserver/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/rfb.h>
#include <rfb/rfbregion.h>
#include "private.h"
void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2);
/*
* Send cursor shape either in X-style format or in client pixel format.
*/
rfbBool
rfbSendCursorShape(rfbClientPtr cl)
{
rfbCursorPtr pCursor;
rfbFramebufferUpdateRectHeader rect;
rfbXCursorColors colors;
int saved_ublen;
int bitmapRowBytes, maskBytes, dataBytes;
int i, j;
uint8_t *bitmapData;
uint8_t bitmapByte;
/* TODO: scale the cursor data to the correct size */
pCursor = cl->screen->getCursorPtr(cl);
/*if(!pCursor) return TRUE;*/
if (cl->useRichCursorEncoding) {
if(pCursor && !pCursor->richSource)
rfbMakeRichCursorFromXCursor(cl->screen,pCursor);
rect.encoding = Swap32IfLE(rfbEncodingRichCursor);
} else {
if(pCursor && !pCursor->source)
rfbMakeXCursorFromRichCursor(cl->screen,pCursor);
rect.encoding = Swap32IfLE(rfbEncodingXCursor);
}
/* If there is no cursor, send update with empty cursor data. */
if ( pCursor && 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;
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 = (uint8_t *)pCursor->source;
for (i = 0; i < pCursor->height; i++) {
for (j = 0; j < bitmapRowBytes; j++) {
bitmapByte = bitmapData[i * bitmapRowBytes + j];
cl->updateBuf[cl->ublen++] = (char)bitmapByte;
}
}
} else {
/* RichCursor encoding. */
int bpp1=cl->screen->serverFormat.bitsPerPixel/8,
bpp2=cl->format.bitsPerPixel/8;
(*cl->translateFn)(cl->translateLookupTable,
&(cl->screen->serverFormat),
&cl->format, (char*)pCursor->richSource,
&cl->updateBuf[cl->ublen],
pCursor->width*bpp1, pCursor->width, pCursor->height);
cl->ublen += pCursor->width*bpp2*pCursor->height;
}
/* Prepare transparency mask. */
bitmapData = (uint8_t *)pCursor->mask;
for (i = 0; i < pCursor->height; i++) {
for (j = 0; j < bitmapRowBytes; j++) {
bitmapByte = bitmapData[i * bitmapRowBytes + j];
cl->updateBuf[cl->ublen++] = (char)bitmapByte;
}
}
/* Send everything we have prepared in the cl->updateBuf[]. */
rfbStatRecordEncodingSent(cl, (cl->useRichCursorEncoding ? rfbEncodingRichCursor : rfbEncodingXCursor),
sz_rfbFramebufferUpdateRectHeader + (cl->ublen - saved_ublen), sz_rfbFramebufferUpdateRectHeader + (cl->ublen - saved_ublen));
if (!rfbSendUpdateBuf(cl))
return FALSE;
return TRUE;
}
/*
* Send cursor position (PointerPos pseudo-encoding).
*/
rfbBool
rfbSendCursorPos(rfbClientPtr cl)
{
rfbFramebufferUpdateRectHeader rect;
if (cl->ublen + sz_rfbFramebufferUpdateRectHeader > UPDATE_BUF_SIZE) {
if (!rfbSendUpdateBuf(cl))
return FALSE;
}
rect.encoding = Swap32IfLE(rfbEncodingPointerPos);
rect.r.x = Swap16IfLE(cl->screen->cursorX);
rect.r.y = Swap16IfLE(cl->screen->cursorY);
rect.r.w = 0;
rect.r.h = 0;
memcpy(&cl->updateBuf[cl->ublen], (char *)&rect,
sz_rfbFramebufferUpdateRectHeader);
cl->ublen += sz_rfbFramebufferUpdateRectHeader;
rfbStatRecordEncodingSent(cl, rfbEncodingPointerPos, sz_rfbFramebufferUpdateRectHeader, sz_rfbFramebufferUpdateRectHeader);
if (!rfbSendUpdateBuf(cl))
return FALSE;
return TRUE;
}
/* conversion routine for predefined cursors in LSB order */
unsigned char rfbReverseByte[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]=rfbReverseByte[(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->cleanup=TRUE;
cursor->width=width;
cursor->height=height;
/*cursor->backRed=cursor->backGreen=cursor->backBlue=0xffff;*/
cursor->foreRed=cursor->foreGreen=cursor->foreBlue=0xffff;
cursor->source = (unsigned char*)calloc(w,height);
cursor->cleanupSource = TRUE;
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 = (unsigned 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 = (unsigned char*)rfbMakeMaskForXCursor(width,height,(char*)cursor->source);
cursor->cleanupMask = TRUE;
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);
}
/* this function dithers the alpha using Floyd-Steinberg */
char* rfbMakeMaskFromAlphaSource(int width,int height,unsigned char* alphaSource)
{
int* error=(int*)calloc(sizeof(int),width);
int i,j,currentError=0,maskStride=(width+7)/8;
unsigned char* result=(unsigned char*)calloc(maskStride,height);
for(j=0;j<height;j++)
for(i=0;i<width;i++) {
int right,middle,left;
currentError+=alphaSource[i+width*j]+error[i];
if(currentError<0x80) {
/* set to transparent */
/* alpha was treated as 0 */
} else {
/* set to solid */
result[i/8+j*maskStride]|=(0x100>>(i&7));
/* alpha was treated as 0xff */
currentError-=0xff;
}
/* propagate to next row */
right=currentError/16;
middle=currentError*5/16;
left=currentError*3/16;
currentError-=right+middle+left;
error[i]=right;
if(i>0) {
error[i-1]=middle;
if(i>1)
error[i-2]=left;
}
}
free(error);
return (char *) result;
}
void rfbFreeCursor(rfbCursorPtr cursor)
{
if(cursor) {
if(cursor->cleanupRichSource && cursor->richSource)
free(cursor->richSource);
if(cursor->cleanupRichSource && cursor->alphaSource)
free(cursor->alphaSource);
if(cursor->cleanupSource && cursor->source)
free(cursor->source);
if(cursor->cleanupMask && cursor->mask)
free(cursor->mask);
if(cursor->cleanup)
free(cursor);
else {
cursor->cleanup=cursor->cleanupSource=cursor->cleanupMask
=cursor->cleanupRichSource=FALSE;
cursor->source=cursor->mask=cursor->richSource=NULL;
cursor->alphaSource=NULL;
}
}
}
/* background and foregroud colour have to be set beforehand */
void rfbMakeXCursorFromRichCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
rfbPixelFormat* format=&rfbScreen->serverFormat;
int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8,
width=cursor->width*bpp;
uint32_t background;
char *back=(char*)&background;
unsigned char bit;
int interp = 0, db = 0;
if(cursor->source && cursor->cleanupSource)
free(cursor->source);
cursor->source=(unsigned char*)calloc(w,cursor->height);
cursor->cleanupSource=TRUE;
if(format->bigEndian) {
back+=4-bpp;
}
/* all zeros means we should interpolate to black+white ourselves */
if (!cursor->backRed && !cursor->backGreen && !cursor->backBlue &&
!cursor->foreRed && !cursor->foreGreen && !cursor->foreBlue) {
if (format->trueColour && (bpp == 1 || bpp == 2 || bpp == 4)) {
interp = 1;
cursor->foreRed = cursor->foreGreen = cursor->foreBlue = 0xffff;
}
}
background = ((format->redMax * cursor->backRed) / 0xffff) << format->redShift |
((format->greenMax * cursor->backGreen) / 0xffff) << format->greenShift |
((format->blueMax * cursor->backBlue) / 0xffff) << format->blueShift;
#define SETRGB(u) \
r = (255 * (((format->redMax << format->redShift) & (*u)) >> format->redShift)) / format->redMax; \
g = (255 * (((format->greenMax << format->greenShift) & (*u)) >> format->greenShift)) / format->greenMax; \
b = (255 * (((format->blueMax << format->blueShift) & (*u)) >> format->blueShift)) / format->blueMax;
if (db) fprintf(stderr, "interp: %d\n", interp);
for(j=0;j<cursor->height;j++) {
for(i=0,bit=0x80;i<cursor->width;i++,bit=(bit&1)?0x80:bit>>1) {
if (interp) {
int r = 0, g = 0, b = 0, grey;
char *p = cursor->richSource+j*width+i*bpp;
if (bpp == 1) {
unsigned char* uc = (unsigned char*) p;
SETRGB(uc);
} else if (bpp == 2) {
unsigned short* us = (unsigned short*) p;
SETRGB(us);
} else if (bpp == 4) {
unsigned int* ui = (unsigned int*) p;
SETRGB(ui);
}
grey = (r + g + b) / 3;
if (grey >= 128) {
cursor->source[j*w+i/8]|=bit;
if (db) fprintf(stderr, "1");
} else {
if (db) fprintf(stderr, "0");
}
} else if(memcmp(cursor->richSource+j*width+i*bpp, back, bpp)) {
cursor->source[j*w+i/8]|=bit;
}
}
if (db) fprintf(stderr, "\n");
}
}
void rfbMakeRichCursorFromXCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr cursor)
{
rfbPixelFormat* format=&rfbScreen->serverFormat;
int i,j,w=(cursor->width+7)/8,bpp=format->bitsPerPixel/8;
uint32_t background,foreground;
char *back=(char*)&background,*fore=(char*)&foreground;
unsigned char *cp;
unsigned char bit;
if(cursor->richSource && cursor->cleanupRichSource)
free(cursor->richSource);
cp=cursor->richSource=(unsigned char*)calloc(cursor->width*bpp,cursor->height);
cursor->cleanupRichSource=TRUE;
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->width;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 rfbHideCursor(rfbClientPtr cl)
{
rfbScreenInfoPtr s=cl->screen;
rfbCursorPtr c=s->cursor;
int j,x1,x2,y1,y2,bpp=s->serverFormat.bitsPerPixel/8,
rowstride=s->paddedWidthInBytes;
LOCK(s->cursorMutex);
if(!c) {
UNLOCK(s->cursorMutex);
return;
}
/* restore what is under the cursor */
x1=cl->cursorX-c->xhot;
x2=x1+c->width;
if(x1<0) x1=0;
if(x2>=s->width) x2=s->width-1;
x2-=x1; if(x2<=0) {
UNLOCK(s->cursorMutex);
return;
}
y1=cl->cursorY-c->yhot;
y2=y1+c->height;
if(y1<0) y1=0;
if(y2>=s->height) y2=s->height-1;
y2-=y1; if(y2<=0) {
UNLOCK(s->cursorMutex);
return;
}
/* get saved data */
for(j=0;j<y2;j++)
memcpy(s->frameBuffer+(y1+j)*rowstride+x1*bpp,
s->underCursorBuffer+j*x2*bpp,
x2*bpp);
/* Copy to all scaled versions */
rfbScaledScreenUpdate(s, x1, y1, x1+x2, y1+y2);
UNLOCK(s->cursorMutex);
}
void rfbShowCursor(rfbClientPtr cl)
{
rfbScreenInfoPtr s=cl->screen;
rfbCursorPtr c=s->cursor;
int i,j,x1,x2,y1,y2,i1,j1,bpp=s->serverFormat.bitsPerPixel/8,
rowstride=s->paddedWidthInBytes,
bufSize,w;
rfbBool wasChanged=FALSE;
if(!c) return;
LOCK(s->cursorMutex);
bufSize=c->width*c->height*bpp;
w=(c->width+7)/8;
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=cl->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) {
UNLOCK(s->cursorMutex);
return; /* nothing to do */
}
y1=cl->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) {
UNLOCK(s->cursorMutex);
return; /* nothing to do */
}
/* save data */
for(j=0;j<y2;j++) {
char* dest=s->underCursorBuffer+j*x2*bpp;
const char* src=s->frameBuffer+(y1+j)*rowstride+x1*bpp;
unsigned int count=x2*bpp;
if(wasChanged || memcmp(dest,src,count)) {
wasChanged=TRUE;
memcpy(dest,src,count);
}
}
if(!c->richSource)
rfbMakeRichCursorFromXCursor(s,c);
if (c->alphaSource) {
int rmax, rshift;
int gmax, gshift;
int bmax, bshift;
int amax = 255; /* alphaSource is always 8bits of info per pixel */
unsigned int rmask, gmask, bmask;
rmax = s->serverFormat.redMax;
gmax = s->serverFormat.greenMax;
bmax = s->serverFormat.blueMax;
rshift = s->serverFormat.redShift;
gshift = s->serverFormat.greenShift;
bshift = s->serverFormat.blueShift;
rmask = (rmax << rshift);
gmask = (gmax << gshift);
bmask = (bmax << bshift);
for(j=0;j<y2;j++) {
for(i=0;i<x2;i++) {
/*
* we loop over the whole cursor ignoring c->mask[],
* using the extracted alpha value instead.
*/
char *dest;
unsigned char *src, *aptr;
unsigned int val, dval, sval;
int rdst, gdst, bdst; /* fb RGB */
int asrc, rsrc, gsrc, bsrc; /* rich source ARGB */
dest = s->frameBuffer + (j+y1)*rowstride + (i+x1)*bpp;
src = c->richSource + (j+j1)*c->width*bpp + (i+i1)*bpp;
aptr = c->alphaSource + (j+j1)*c->width + (i+i1);
asrc = *aptr;
if (!asrc) {
continue;
}
if (bpp == 1) {
dval = *((unsigned char*) dest);
sval = *((unsigned char*) src);
} else if (bpp == 2) {
dval = *((unsigned short*) dest);
sval = *((unsigned short*) src);
} else if (bpp == 3) {
unsigned char *dst = (unsigned char *) dest;
dval = 0;
dval |= ((*(dst+0)) << 0);
dval |= ((*(dst+1)) << 8);
dval |= ((*(dst+2)) << 16);
sval = 0;
sval |= ((*(src+0)) << 0);
sval |= ((*(src+1)) << 8);
sval |= ((*(src+2)) << 16);
} else if (bpp == 4) {
dval = *((unsigned int*) dest);
sval = *((unsigned int*) src);
} else {
continue;
}
/* extract dest and src RGB */
rdst = (dval & rmask) >> rshift; /* fb */
gdst = (dval & gmask) >> gshift;
bdst = (dval & bmask) >> bshift;
rsrc = (sval & rmask) >> rshift; /* richcursor */
gsrc = (sval & gmask) >> gshift;
bsrc = (sval & bmask) >> bshift;
/* blend in fb data. */
if (! c->alphaPreMultiplied) {
rsrc = (asrc * rsrc)/amax;
gsrc = (asrc * gsrc)/amax;
bsrc = (asrc * bsrc)/amax;
}
rdst = rsrc + ((amax - asrc) * rdst)/amax;
gdst = gsrc + ((amax - asrc) * gdst)/amax;
bdst = bsrc + ((amax - asrc) * bdst)/amax;
val = 0;
val |= (rdst << rshift);
val |= (gdst << gshift);
val |= (bdst << bshift);
/* insert the cooked pixel into the fb */
memcpy(dest, &val, bpp);
}
}
} else {
/* 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);
}
/* Copy to all scaled versions */
rfbScaledScreenUpdate(s, x1, y1, x1+x2, y1+y2);
UNLOCK(s->cursorMutex);
}
/*
* If enableCursorShapeUpdates is FALSE, and the cursor is hidden, make sure
* that if the frameBuffer was transmitted with a cursor drawn, then that
* region gets redrawn.
*/
void rfbRedrawAfterHideCursor(rfbClientPtr cl,sraRegionPtr updateRegion)
{
rfbScreenInfoPtr s = cl->screen;
rfbCursorPtr c = s->cursor;
if(c) {
int x,y,x2,y2;
x = cl->cursorX-c->xhot;
y = cl->cursorY-c->yhot;
x2 = x+c->width;
y2 = y+c->height;
if(sraClipRect2(&x,&y,&x2,&y2,0,0,s->width,s->height)) {
sraRegionPtr rect;
rect = sraRgnCreateRect(x,y,x2,y2);
if(updateRegion)
sraRgnOr(updateRegion,rect);
else
sraRgnOr(cl->modifiedRegion,rect);
sraRgnDestroy(rect);
}
}
}
#ifdef DEBUG
static 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');
}
}
#endif
void rfbSetCursor(rfbScreenInfoPtr rfbScreen,rfbCursorPtr c)
{
rfbClientIteratorPtr iterator;
rfbClientPtr cl;
LOCK(rfbScreen->cursorMutex);
if(rfbScreen->cursor) {
iterator=rfbGetClientIterator(rfbScreen);
while((cl=rfbClientIteratorNext(iterator)))
if(!cl->enableCursorShapeUpdates)
rfbRedrawAfterHideCursor(cl,NULL);
rfbReleaseClientIterator(iterator);
if(rfbScreen->cursor->cleanup)
rfbFreeCursor(rfbScreen->cursor);
}
rfbScreen->cursor = c;
iterator=rfbGetClientIterator(rfbScreen);
while((cl=rfbClientIteratorNext(iterator))) {
cl->cursorWasChanged = TRUE;
if(!cl->enableCursorShapeUpdates)
rfbRedrawAfterHideCursor(cl,NULL);
}
rfbReleaseClientIterator(iterator);
UNLOCK(rfbScreen->cursorMutex);
}
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