Attachment 144666 Details for Bug 206525 – Source file for streaming video calls

Source file for streaming video calls

NativeCanvas.cpp (text/x-c++src), 5.83 KB, created by david schuller on 2007-01-02 19:31:59 UTC

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Creator: david schuller

Created: 2007-01-02 19:31:59 UTC

Size: 5.83 KB

patch

obsolete

>/*
> * Copyright 1999 Sun Microsystems, Inc.,
> * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
> * All rights reserved.
> * 
> */
>
>#include "NativeHeaders.h"
>#include <jawt_md.h>
>#include <X11/extensions/Xvlib.h>
>#include <X11/keysym.h>
>
>#ifndef XV_UYVY
>#define XV_UYVY 0x59565955
>#endif
>
>/*
> * Class:     MyCanvas
> * Method:    paint
> * Signature: (Ljava/awt/Graphics;)V
> */
>
>JNIEXPORT void JNICALL Java_edu_cornell_macchess_nativecom_XWindowsCanvas_paint
>(JNIEnv* env, jobject canvas, jobject graphics)
>{
>    JAWT awt;
>    JAWT_DrawingSurface* ds;
>    JAWT_DrawingSurfaceInfo* dsi;
>    JAWT_X11DrawingSurfaceInfo* dsi_x11;
>    //jboolean result;
>    jint lock;
>    GC gc;
>    
>    //short	i;
>    //char	testString[] = "^^^ rendered from native code ^^^";
>
>    /* Get the AWT */
>    awt.version = JAWT_VERSION_1_3;
>    if (JAWT_GetAWT(env, &awt) == JNI_FALSE) {
>        printf("AWT Not found\n");
>        return;
>    }
>
>    /* Get the drawing surface */
>    ds = awt.GetDrawingSurface(env, canvas);
>    if (ds == NULL) {
>        printf("NULL drawing surface\n");
>        return;
>    }
>
>    /* Lock the drawing surface */
>    lock = ds->Lock(ds);
>    if((lock & JAWT_LOCK_ERROR) != 0) {
>        printf("Error locking surface\n");
>        awt.FreeDrawingSurface(ds);
>        return;
>    }
>
>    /* Get the drawing surface info */
>    dsi = ds->GetDrawingSurfaceInfo(ds);
>    if (dsi == NULL) {
>        printf("Error getting surface info\n");
>        ds->Unlock(ds);
>        awt.FreeDrawingSurface(ds);
>        return;
>    }
>
>    /* Get the platform-specific drawing info */
>    dsi_x11 = (JAWT_X11DrawingSurfaceInfo*)dsi->platformInfo;
>
>
>    /* Get the object's current buffer */
>   jclass cls = (env)->GetObjectClass(canvas);
>   jfieldID fid = (env)->GetFieldID(cls, "buffer", "[B");
>   jbyteArray barr = (jbyteArray)((env)->GetObjectField(canvas, fid));
>   jboolean isCopy;
>   jbyte *buf = (jbyte*)((env)->GetPrimitiveArrayCritical(barr, &isCopy));
>
>
>   // Testing to see whether Java is not giving direct memory access
>   //   if(isCopy)
>   //  fprintf(stderr, "java is making copies of the memory buffer: %d\n", (int)isCopy);
>   //else fprintf(stderr, "Java is not making copies, we have direct access");
>
>    /* Now paint */
>    
>   unsigned int num_adaptors;
>   XvAdaptorInfo *info;
>   XvQueryAdaptors(dsi_x11->display, DefaultRootWindow(dsi_x11->display), &num_adaptors, &info);
>   gc = XCreateGC(dsi_x11->display, dsi_x11->drawable, 0, 0);
>   XvImage *xv_image=XvCreateImage(dsi_x11->display,info[0].base_id, XV_UYVY, (char*)buf, 1024, 768);
>   if(xv_image == NULL) 
>   {
>        jclass newExcCls = env->FindClass("edu/cornell/macchess/nativecom/NativeException");
>        if (newExcCls == 0) // Unable to find the new exception class, give up. 
>            return;
>        env->ThrowNew(newExcCls, "xvCreateImage Failed! (Returned Null)");
>        return;
>   }
>   XvPutImage(dsi_x11->display, info[0].base_id, dsi_x11->drawable, gc, xv_image,
>	      0,0,1024,768, 
>	      0,0,1024,768);
>
>  /* 
>   * figure out how big the canvas is on-screen
>   * UPDATE: We can't resize the canvas this easily, because 
>   * it requires resizing all drawn objects, such as crosshairs, etc
>   *
>   * jclass cls = env->GetObjectClass(jobj);
>   * jfieldID fid = env->GetFieldID(cls, "keyFrame",  "I");  
>   * int keyFrame = env -> GetIntField(jobj, fid);
>   * env->SetIntField(jobj, fid, -1);   
>   */
>
>
>   (env) -> ReleasePrimitiveArrayCritical(barr, buf, 0);
>
>   /*
>
>    XSetBackground(dsi_x11->display, gc, 0);
>    for (i=0; i<36;i++)
>    {
>	XSetForeground(dsi_x11->display, gc, 10*i);
>   	XFillRectangle(dsi_x11->display, dsi_x11->drawable, gc,
>                   	10*i, 5, 90, 90);
>    }
>    XSetForeground(dsi_x11->display, gc, 155);
>    testString[1] = (char)((++p)%256);
>    XDrawImageString(dsi_x11->display, dsi_x11->drawable, gc,
>    			100, 110, testString, strlen(testString));
>    
>    */
>    
>    /* Free the adaptor info */
>    XvFreeAdaptorInfo(info);
>
>    /* Free the graphics context */
>    XFreeGC(dsi_x11->display, gc);
>   
>
>    /* Free the drawing surface info */
>    ds->FreeDrawingSurfaceInfo(dsi);
>
>    /* Unlock the drawing surface */
>    ds->Unlock(ds);
>
>    /* Free the drawing surface */
>    awt.FreeDrawingSurface(ds);
>}
>
>/*
> * Class:     edu_cornell_macchess_nativecom_XWindowsCanvas
> * Method:    refresh
> * Signature: ()V
> * Description: 
> * Here we unfortunately have to hack together a refresh.
> * This is how it works - since the window "fixes itself" anytime it
> * it is covered by something and then uncovered, I decided to do just that -
> * xrefresh is a program that maps an invisible xwindow to the screen, and then
> * immediately unmaps it. I yanked and simplified a bit of code from it. It tells 
> * the windowing system to draw a small 1 pixel window in the center of the 
> * screen, and when it unmaps, voila we have a forced refresh....
> *
> * UPDATE: code changed to take a coordinate parameter due to dual monitor setup
> * --Ismail Degani, March 24th, 2005
> */
>JNIEXPORT void JNICALL Java_edu_cornell_macchess_nativecom_XWindowsCanvas_refresh
>  (JNIEnv *, jobject, jint x, jint y)
>{
>    Visual visual;
>    XSetWindowAttributes xswa;
>    Display *dpy;
>    unsigned long mask = 0;
>    int screen;
>    Window win;
>    if ((dpy = XOpenDisplay(NULL)) == NULL) {
>      fprintf (stderr, "unable to open display\n");
>      return;
>    }
>    screen = DefaultScreen (dpy);
>    //xswa.background_pixmap = ParentRelative;
>    //mask |= CWBackPixmap;
>    xswa.override_redirect = True;
>    xswa.backing_store = NotUseful;
>    xswa.save_under = False;
>    mask |= (CWOverrideRedirect | CWBackingStore | CWSaveUnder);
>    visual.visualid = CopyFromParent;
>    win = XCreateWindow(dpy, DefaultRootWindow(dpy), x, y, 1, 1,
>                        0, DefaultDepth(dpy, screen), InputOutput, &visual, mask, &xswa);
>    XMapWindow (dpy, win);
>    /* the following will free the color that we might have allocateded */
>    XCloseDisplay (dpy);
>}
>

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Attachments on bug 206525: 144662 | 144663 | 144664 | 144665 | 144666 | 145420 | 145421 | 145483 | 145944