C++ (Cpp) CGDisplayBytesPerRow Examples

Example #1

File: readfb.c Project: alfintatorkace/osx-10.9-opensource

int main(int argc, char * argv[])
{
    IOReturn            err;
    CGDirectDisplayID   dspy = CGMainDisplayID();
    io_service_t        framebuffer;
    CGRect              bounds;
    vm_address_t        buffer;
    vm_size_t           size, rowBytes;

    framebuffer = CGDisplayIOServicePort(dspy);
    assert (framebuffer != MACH_PORT_NULL);
    dspy = CGMainDisplayID();
    bounds = CGDisplayBounds(dspy);
    rowBytes = CGDisplayBytesPerRow(dspy);

    err = IOAccelReadFramebuffer(framebuffer, bounds.size.width, bounds.size.height, rowBytes,
                                 &buffer, &size);
    if (kIOReturnSuccess == err)
    {
        fprintf(stderr, "writing 0x%x bytes from 0x%x\n", size, buffer);
        write(STDOUT_FILENO, (const void *) buffer, size);
        vm_deallocate(mach_task_self(), buffer, size);
    }
    return (0);
}

Example #2

File: fblines.c Project: tonyg/mac-display-hacks

static void setup_screen(void) {
  CGDirectDisplayID targetDisplay = kCGDirectMainDisplay;

  CGDisplayCapture(targetDisplay); /* crucial for being permitted to write on it */
  screen.base = (uint32_t *) CGDisplayBaseAddress(targetDisplay);
  screen.stride = CGDisplayBytesPerRow(targetDisplay) / sizeof(uint32_t);
  screen.width = CGDisplayPixelsWide(targetDisplay);
  screen.height = CGDisplayPixelsHigh(targetDisplay);
}