help, anybody?
P.S. forgot to mention that XShmPutImage always returns me -1, what's that?
P.P.S. please help me with the problem below
----- Original Message -----
From: Michael Zayats <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, October 19, 2001 8:21 PM
Subject: XShmPutImage
> well now I am trying to switch to "regular" XShmPutImage, but it doesn't
> work for me
>
> a few comments to the code: my visual is 16bpp 565 RGB the following code
> misses smth, please spend two minutes in Draw function, put your attention
> that window is allocated in the other place, what I get on screen are two
> black windows :( may be I miss something, Should I handle Exposure event
in
> some special way in my event loop?
>
> class XVideoRenderer : public IVideoRenderer {
> public:
> XVideoRenderer();
> virtual ~XVideoRenderer();
>
> virtual int Initialize(void *pWindowHandle);
>
> virtual int Draw(unsigned char *pFrameBuffer,
> long nFrameBufferSize,
> unsigned short nWidth,
> unsigned short nHeight,
> unsigned short nBpp,
> void *pLiveVideoWindow = 0,
> bool bUpdate = false,
> unsigned long dwFlags = 0);
>
> virtual int Finalize();
> private:
> int isInitialized; file://part of initialization performed on first
draw
> Window win; file://X window handle
> XWindowAttributes *win_attr;
> GC gc; file://Graphic context
> Display *dpy; file://X server connection
>
> XImage *x_image; file://shared memory based image
> XShmSegmentInfo x_shminfo; file://shared memory info struct
>
> int cur_width, cur_height; file://current height and width of win
>
> void get_win_size(int *width, int *height); file://get the size of win
> from Xserver
> };
>
>
> int XVideoRenderer::Initialize(void *pWindowHandle)
> {
> win = (Window)pWindowHandle;
> dpy = XOpenDisplay(NULL);
> win_attr = (XWindowAttributes *)malloc(sizeof(XWindowAttributes));
> XGetWindowAttributes(dpy, win, win_attr);
> gc = XCreateGC(dpy, win, 0, 0);
>
> return 0;
> }
>
> int XVideoRenderer::Draw(unsigned char *pFrameBuffer,
> long nFrameBufferSize,
> unsigned short nWidth,
> unsigned short nHeight,
> unsigned short nBpp,
> void *pLiveVideoWindow = 0,
> bool bUpdate = false,
> unsigned long dwFlags = 0)
> {
> if (!isInitialized)
> {
> printf("Initalizing\n");
> x_image = XShmCreateImage(dpy, win_attr->visual, win_attr->depth,
> ZPixmap, 0, &x_shminfo, nWidth,
> nHeight);
> x_shminfo.shmid = shmget(IPC_PRIVATE, x_image->bytes_per_line *
> x_image->height, IPC_CREAT |
> 0777);
> x_shminfo.shmaddr = x_image->data = (char *)shmat(x_shminfo.shmid,
> 0, 0);
> x_shminfo.readOnly = False;
> XShmAttach(dpy, &x_shminfo);
> isInitialized = 1;
> }
>
>
> // check for window size
> int new_width, new_height;
> get_win_size(&new_width, &new_height);
>
> if ((new_width != nWidth) || (new_height != nHeight))
> {
> XResizeWindow(dpy, win, nWidth, nHeight);
> }
>
> memcpy(x_image->data, pFrameBuffer, nWidth * nHeight * 2);
>
>
> XShmPutImage(dpy, win, gc, x_image,
> 0, 0, x_image->width, x_image->height,
> 0, 0, False);
>
> XFlush(dpy);
>
> return 0;
> }
>
> thank you in advance,
>
> Michael
>
>
>
>
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