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-rw-r--r--libvncserver/scale.c411
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diff --git a/libvncserver/scale.c b/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 CORBA
+#include <vncserverctrl.h>
+#endif
+
+#ifdef DEBUGPROTO
+#undef DEBUGPROTO
+#define DEBUGPROTO(x) x
+#else
+#define DEBUGPROTO(x)
+#endif
+
+/****************************/
+#include <math.h>
+
+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, 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");
+
+ 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) + v) * bytesPerPixel) +
+ (w * 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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