post img on-screen

I would appreciate if someone can offer a suggestion as to why I can not see a picture on my screen I received over the network.

I know that the display of the child who I try to view my img on visible is there active pan/zoom and pan/zoom, so I know the screen is there, but the image is not.

My code is below...

  if (( rc = img_load(ilib, memory_stream, NULL, &img)) != IMG_ERR_OK) {
        fprintf(stderr, "img_load_file() failed: %d\n",  rc);
        //return -1;
    }

    if(rc != -1)
    {
        int Fsize[2];
        Fsize[0] = img.w;
        Fsize[1] = img.h;
        viewport_size[0] = img.w;
        viewport_size[1] = img.h;
        screen_set_window_property_iv(screen, SCREEN_PROPERTY_BUFFER_SIZE, Fsize);
        screen_create_window_buffers(screen, 1);
        screen_buffer_t bg_buf;
        screen_get_window_property_pv(screen, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)bg_buf);
        screen_get_buffer_property_pv(bg_buf, SCREEN_PROPERTY_POINTER, (void **)&img.access.direct.data);
        screen_get_buffer_property_iv(bg_buf, SCREEN_PROPERTY_STRIDE, (int *)&img.access.direct.stride);
        img.flags |= IMG_DIRECT;
        int rect[4] = { 0, 0, 1024, 600 };
        screen_post_window(screen, bg_buf, 1, rect, SCREEN_WAIT_IDLE );
    }

Your source should be this https://github.com/blackberry/NDK-Samples/blob/master/Gesture/main.c

You can compile this example and when it works, because you play with it as long as you want.

Try to understand * how * it works regarding the image loading, especially if you're new to the platform (or C programming in general).
Tip: by calling this

screen_get_buffer_property_pv(screen_buf,SCREEN_PROPERTY_POINTER,(void**)&img->access.direct.data);

you have set up the img access.direct.data member to point to a 'buffer' screen, so whatever you fill it with will be visible on the screen. That is, you must first prepare your img making this call and then actually to load image data of the file/stream/let it be in this space.

PS:

screen_get_window_property_pv(screen, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)bg_buf);

and

screen_get_window_property_pv(screen, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)&bg_buf);

is a big difference ;-)

Tags: BlackBerry Developers

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