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libtdevnc/libvncserver/scale.c

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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)) )
static inline int pad4(int value)
{
int remainder = value & 3;
if (!remainder) return value;
return value + 4 - remainder;
}
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)
{
int allocSize;
/* copy *everything* (we don't use most of it, but just in case) */
memcpy(ptr, cl->screen, sizeof(rfbScreenInfo));
/* SECURITY: make sure that no integer overflow will occur afterwards.
* Note: this is defensive coding, as the check should have already been
* performed during initial, non-scaled screen setup.
*/
allocSize = pad4(width * (ptr->bitsPerPixel/8)); /* per protocol, width<2**16 and bpp<256 */
if (height == 0 || allocSize >= SIZE_MAX / height)
{
free(ptr);
return NULL; /* malloc() will allocate an incorrect buffer size - early abort */
}
/* Resume copy everything */
ptr->width = width;
ptr->height = height;
ptr->paddedWidthInBytes = (ptr->bitsPerPixel/8)*ptr->width;
/* Need to by multiples of 4 for Sparc systems */
ptr->paddedWidthInBytes = pad4(ptr->paddedWidthInBytes);
/* 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);
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);
return FALSE;
}
}
return TRUE;
}
/****************************/
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