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krfb/libvncserver/scale.c
George Kiagiadakis 9f56633c0b Sync with libvncserver from git (git describe version: 0.9.8-10-g17ce0c5). 
My patches in this local fork have been merged upstream, but they
have been merged after 0.9.8 and 0.9.9 hasn't been released yet,
so we cannot yet switch back to finding libvncserver externally.

So I am syncing now with basically what is 0.9.8 + my patches and a few bugfixes.

svn path=/trunk/KDE/kdenetwork/krfb/; revision=1258493
2011-10-11 19:12:14 +00:00

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/*
* scale.c - deal with server-side scaling.
*/
/*
* Copyright (C) 2005 Rohit Kumar, Johannes E. Schindelin
* Copyright (C) 2002 RealVNC Ltd.
* 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.
*/
#ifdef __STRICT_ANSI__
#define _BSD_SOURCE
#endif
#include <string.h>
#include "rfb/rfb.h"
#include "rfb/rfbregion.h"
#include "private.h"
#ifdef LIBVNCSERVER_HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef WIN32
#define write(sock,buf,len) send(sock,buf,len,0)
#else
#ifdef LIBVNCSERVER_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <pwd.h>
#ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef LIBVNCSERVER_HAVE_NETINET_IN_H
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#endif
#endif
#ifdef DEBUGPROTO
#undef DEBUGPROTO
#define DEBUGPROTO(x) x
#else
#define DEBUGPROTO(x)
#endif
/****************************/
#define CEIL(x) ( (double) ((int) (x)) == (x) ? \
(double) ((int) (x)) : (double) ((int) (x) + 1) )
#define FLOOR(x) ( (double) ((int) (x)) )
int ScaleX(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int x)
{
if ((from==to) || (from==NULL) || (to==NULL)) return x;
return ((int)(((double) x / (double)from->width) * (double)to->width ));
}
int ScaleY(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int y)
{
if ((from==to) || (from==NULL) || (to==NULL)) return y;
return ((int)(((double) y / (double)from->height) * (double)to->height ));
}
/* So, all of the encodings point to the ->screen->frameBuffer,
* We need to change this!
*/
void rfbScaledCorrection(rfbScreenInfoPtr from, rfbScreenInfoPtr to, int *x, int *y, int *w, int *h, const char *function)
{
double x1,y1,w1,h1, x2, y2, w2, h2;
double scaleW = ((double) to->width) / ((double) from->width);
double scaleH = ((double) to->height) / ((double) from->height);
/*
* rfbLog("rfbScaledCorrection(%p -> %p, %dx%d->%dx%d (%dXx%dY-%dWx%dH)\n",
* from, to, from->width, from->height, to->width, to->height, *x, *y, *w, *h);
*/
/* If it's the original framebuffer... */
if (from==to) return;
x1 = ((double) *x) * scaleW;
y1 = ((double) *y) * scaleH;
w1 = ((double) *w) * scaleW;
h1 = ((double) *h) * scaleH;
/*cast from double to int is same as "*x = floor(x1);" */
x2 = FLOOR(x1);
y2 = FLOOR(y1);
/* include into W and H the jitter of scaling X and Y */
w2 = CEIL(w1 + ( x1 - x2 ));
h2 = CEIL(h1 + ( y1 - y2 ));
/*
* rfbLog("%s (%dXx%dY-%dWx%dH -> %fXx%fY-%fWx%fH) {%dWx%dH -> %dWx%dH}\n",
* function, *x, *y, *w, *h, x2, y2, w2, h2,
* from->width, from->height, to->width, to->height);
*/
/* simulate ceil() without math library */
*x = (int)x2;
*y = (int)y2;
*w = (int)w2;
*h = (int)h2;
/* Small changes for a thumbnail may be scaled to zero */
if (*w==0) (*w)++;
if (*h==0) (*h)++;
/* scaling from small to big may overstep the size a bit */
if (*x+*w > to->width) *w=to->width - *x;
if (*y+*h > to->height) *h=to->height - *y;
}
void rfbScaledScreenUpdateRect(rfbScreenInfoPtr screen, rfbScreenInfoPtr ptr, int x0, int y0, int w0, int h0)
{
int x,y,w,v,z;
int x1, y1, w1, h1;
int bitsPerPixel, bytesPerPixel, bytesPerLine, areaX, areaY, area2;
unsigned char *srcptr, *dstptr;
/* Nothing to do!!! */
if (screen==ptr) return;
x1 = x0;
y1 = y0;
w1 = w0;
h1 = h0;
rfbScaledCorrection(screen, ptr, &x1, &y1, &w1, &h1, "rfbScaledScreenUpdateRect");
x0 = ScaleX(ptr, screen, x1);
y0 = ScaleY(ptr, screen, y1);
w0 = ScaleX(ptr, screen, w1);
h0 = ScaleY(ptr, screen, h1);
bitsPerPixel = screen->bitsPerPixel;
bytesPerPixel = bitsPerPixel / 8;
bytesPerLine = w1 * bytesPerPixel;
srcptr = (unsigned char *)(screen->frameBuffer +
(y0 * screen->paddedWidthInBytes + x0 * bytesPerPixel));
dstptr = (unsigned char *)(ptr->frameBuffer +
( y1 * ptr->paddedWidthInBytes + x1 * bytesPerPixel));
/* The area of the source framebuffer for each destination pixel */
areaX = ScaleX(ptr,screen,1);
areaY = ScaleY(ptr,screen,1);
area2 = areaX*areaY;
/* Ensure that we do not go out of bounds */
if ((x1+w1) > (ptr->width))
{
if (x1==0) w1=ptr->width; else x1 = ptr->width - w1;
}
if ((y1+h1) > (ptr->height))
{
if (y1==0) h1=ptr->height; else y1 = ptr->height - h1;
}
/*
* rfbLog("rfbScaledScreenUpdateRect(%dXx%dY-%dWx%dH -> %dXx%dY-%dWx%dH <%dx%d>) {%dWx%dH -> %dWx%dH} 0x%p\n",
* x0, y0, w0, h0, x1, y1, w1, h1, areaX, areaY,
* screen->width, screen->height, ptr->width, ptr->height, ptr->frameBuffer);
*/
if (screen->serverFormat.trueColour) { /* Blend neighbouring pixels together */
unsigned char *srcptr2;
unsigned long pixel_value, red, green, blue;
unsigned int redShift = screen->serverFormat.redShift;
unsigned int greenShift = screen->serverFormat.greenShift;
unsigned int blueShift = screen->serverFormat.blueShift;
unsigned long redMax = screen->serverFormat.redMax;
unsigned long greenMax = screen->serverFormat.greenMax;
unsigned long blueMax = screen->serverFormat.blueMax;
/* for each *destination* pixel... */
for (y = 0; y < h1; y++) {
for (x = 0; x < w1; x++) {
red = green = blue = 0;
/* Get the totals for rgb from the source grid... */
for (w = 0; w < areaX; w++) {
for (v = 0; v < areaY; v++) {
srcptr2 = &srcptr[(((x * areaX) + w) * bytesPerPixel) +
(v * screen->paddedWidthInBytes)];
pixel_value = 0;
switch (bytesPerPixel) {
case 4: pixel_value = *((unsigned int *)srcptr2); break;
case 2: pixel_value = *((unsigned short *)srcptr2); break;
case 1: pixel_value = *((unsigned char *)srcptr2); break;
default:
/* fixme: endianess problem? */
for (z = 0; z < bytesPerPixel; z++)
pixel_value += (srcptr2[z] << (8 * z));
break;
}
/*
srcptr2 += bytesPerPixel;
*/
red += ((pixel_value >> redShift) & redMax);
green += ((pixel_value >> greenShift) & greenMax);
blue += ((pixel_value >> blueShift) & blueMax);
}
}
/* We now have a total for all of the colors, find the average! */
red /= area2;
green /= area2;
blue /= area2;
/* Stuff the new value back into memory */
pixel_value = ((red & redMax) << redShift) | ((green & greenMax) << greenShift) | ((blue & blueMax) << blueShift);
switch (bytesPerPixel) {
case 4: *((unsigned int *)dstptr) = (unsigned int) pixel_value; break;
case 2: *((unsigned short *)dstptr) = (unsigned short) pixel_value; break;
case 1: *((unsigned char *)dstptr) = (unsigned char) pixel_value; break;
default:
/* fixme: endianess problem? */
for (z = 0; z < bytesPerPixel; z++)
dstptr[z]=(pixel_value >> (8 * z)) & 0xff;
break;
}
dstptr += bytesPerPixel;
}
srcptr += (screen->paddedWidthInBytes * areaY);
dstptr += (ptr->paddedWidthInBytes - bytesPerLine);
}
} else
{ /* Not truecolour, so we can't blend. Just use the top-left pixel instead */
for (y = y1; y < (y1+h1); y++) {
for (x = x1; x < (x1+w1); x++)
memcpy (&ptr->frameBuffer[(y *ptr->paddedWidthInBytes) + (x * bytesPerPixel)],
&screen->frameBuffer[(y * areaY * screen->paddedWidthInBytes) + (x *areaX * bytesPerPixel)], bytesPerPixel);
}
}
}
void rfbScaledScreenUpdate(rfbScreenInfoPtr screen, int x1, int y1, int x2, int y2)
{
/* ok, now the task is to update each and every scaled version of the framebuffer
* and we only have to do this for this specific changed rectangle!
*/
rfbScreenInfoPtr ptr;
int count=0;
/* We don't point to cl->screen as it is the original */
for (ptr=screen->scaledScreenNext;ptr!=NULL;ptr=ptr->scaledScreenNext)
{
/* Only update if it has active clients... */
if (ptr->scaledScreenRefCount>0)
{
rfbScaledScreenUpdateRect(screen, ptr, x1, y1, x2-x1, y2-y1);
count++;
}
}
}
/* Create a new scaled version of the framebuffer */
rfbScreenInfoPtr rfbScaledScreenAllocate(rfbClientPtr cl, int width, int height)
{
rfbScreenInfoPtr ptr;
ptr = malloc(sizeof(rfbScreenInfo));
if (ptr!=NULL)
{
/* copy *everything* (we don't use most of it, but just in case) */
memcpy(ptr, cl->screen, sizeof(rfbScreenInfo));
ptr->width = width;
ptr->height = height;
ptr->paddedWidthInBytes = (ptr->bitsPerPixel/8)*ptr->width;
/* Need to by multiples of 4 for Sparc systems */
ptr->paddedWidthInBytes += (ptr->paddedWidthInBytes % 4);
/* Reset the reference count to 0! */
ptr->scaledScreenRefCount = 0;
ptr->sizeInBytes = ptr->paddedWidthInBytes * ptr->height;
ptr->serverFormat = cl->screen->serverFormat;
ptr->frameBuffer = malloc(ptr->sizeInBytes);
if (ptr->frameBuffer!=NULL)
{
/* Reset to a known condition: scale the entire framebuffer */
rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height);
/* Now, insert into the chain */
LOCK(cl->updateMutex);
ptr->scaledScreenNext = cl->screen->scaledScreenNext;
cl->screen->scaledScreenNext = ptr;
UNLOCK(cl->updateMutex);
}
else
{
/* Failed to malloc the new frameBuffer, cleanup */
free(ptr);
ptr=NULL;
}
}
return ptr;
}
/* Find an active scaled version of the framebuffer
* TODO: implement a refcount per scaled screen to prevent
* unreferenced scaled screens from hanging around
*/
rfbScreenInfoPtr rfbScalingFind(rfbClientPtr cl, int width, int height)
{
rfbScreenInfoPtr ptr;
/* include the original in the search (ie: fine 1:1 scaled version of the frameBuffer) */
for (ptr=cl->screen; ptr!=NULL; ptr=ptr->scaledScreenNext)
{
if ((ptr->width==width) && (ptr->height==height))
return ptr;
}
return NULL;
}
/* Future needs "scale to 320x240, as that's the client's screen size */
void rfbScalingSetup(rfbClientPtr cl, int width, int height)
{
rfbScreenInfoPtr ptr;
ptr = rfbScalingFind(cl,width,height);
if (ptr==NULL)
ptr = rfbScaledScreenAllocate(cl,width,height);
/* Now, there is a new screen available (if ptr is not NULL) */
if (ptr!=NULL)
{
/* Update it! */
if (ptr->scaledScreenRefCount<1)
rfbScaledScreenUpdateRect(cl->screen, ptr, 0, 0, cl->screen->width, cl->screen->height);
/*
* rfbLog("Taking one from %dx%d-%d and adding it to %dx%d-%d\n",
* cl->scaledScreen->width, cl->scaledScreen->height,
* cl->scaledScreen->scaledScreenRefCount,
* ptr->width, ptr->height, ptr->scaledScreenRefCount);
*/
LOCK(cl->updateMutex);
cl->scaledScreen->scaledScreenRefCount--;
ptr->scaledScreenRefCount++;
cl->scaledScreen=ptr;
cl->newFBSizePending = TRUE;
UNLOCK(cl->updateMutex);
rfbLog("Scaling to %dx%d (refcount=%d)\n",width,height,ptr->scaledScreenRefCount);
}
else
rfbLog("Scaling to %dx%d failed, leaving things alone\n",width,height);
}
int rfbSendNewScaleSize(rfbClientPtr cl)
{
/* if the client supports newFBsize Encoding, use it */
if (cl->useNewFBSize && cl->newFBSizePending)
return FALSE;
LOCK(cl->updateMutex);
cl->newFBSizePending = FALSE;
UNLOCK(cl->updateMutex);
if (cl->PalmVNC==TRUE)
{
rfbPalmVNCReSizeFrameBufferMsg pmsg;
pmsg.type = rfbPalmVNCReSizeFrameBuffer;
pmsg.pad1 = 0;
pmsg.desktop_w = Swap16IfLE(cl->screen->width);
pmsg.desktop_h = Swap16IfLE(cl->screen->height);
pmsg.buffer_w = Swap16IfLE(cl->scaledScreen->width);
pmsg.buffer_h = Swap16IfLE(cl->scaledScreen->height);
pmsg.pad2 = 0;
rfbLog("Sending a response to a PalmVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height);
if (rfbWriteExact(cl, (char *)&pmsg, sz_rfbPalmVNCReSizeFrameBufferMsg) < 0) {
rfbLogPerror("rfbNewClient: write");
rfbCloseClient(cl);
rfbClientConnectionGone(cl);
return FALSE;
}
}
else
{
rfbResizeFrameBufferMsg rmsg;
rmsg.type = rfbResizeFrameBuffer;
rmsg.pad1=0;
rmsg.framebufferWidth = Swap16IfLE(cl->scaledScreen->width);
rmsg.framebufferHeigth = Swap16IfLE(cl->scaledScreen->height);
rfbLog("Sending a response to a UltraVNC style frameuffer resize event (%dx%d)\n", cl->scaledScreen->width, cl->scaledScreen->height);
if (rfbWriteExact(cl, (char *)&rmsg, sz_rfbResizeFrameBufferMsg) < 0) {
rfbLogPerror("rfbNewClient: write");
rfbCloseClient(cl);
rfbClientConnectionGone(cl);
return FALSE;
}
}
return TRUE;
}
/****************************/
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