rtgui中窗口移动需要framebuffer? && touch.c中屏幕校准的一处问题

发布于 2014-09-05 14:57:24 浏览：2194 订阅该版

问题1

在 rtgui/server/mouse.c中
在窗口移动的过程中 
用到了 函数rtgui_winrect_save()  和 rtgui_winrect_restore()   
二者都调用了   下面的函数来获取 framebuffer 
```driver_fb = rtgui_graphic_driver_get_framebuffer(RT_NULL);```

对没有设置 framebuffer的情况 上面函数返回RT_NULL
因此  在计算图像数据 偏移的时候
``` fb_ptr = driver_fb + win_rect.y1 * _rtgui_cursor->screen_pitch +
             win_rect.x1 * _rtgui_cursor->bpp;```

得到的fb_ptr是   0x0＋坐标偏移

在后面
```display_direct_memcpy(winrect_ptr, fb_ptr, winrect_pitch, _rtgui_cursor->screen_pitch,
                          (win_rect.y2 - win_rect.y1), winrect_pitch);```
从winrect_ptr往fb_ptr 会发生错误。

=============================

问题2

touch.c中

```rt_bool_t rtgui_touch_do_calibration(struct rtgui_event_touch *event)
{
#ifdef RTGUI_USING_CALIBRATION
	/* calibration mode */
	if (_calibrating == RT_TRUE)	
	{
		/* only do the calibration on touch UP */
		if (event->up_down == RTGUI_TOUCH_UP && _cali_ops != RT_NULL &&
			_cali_ops->calibration_post != RT_NULL)		
			_cali_ops->calibration_post(event->x, event->y);

return RT_FALSE;	
	}
#endif

if (event->up_down == RTGUI_TOUCH_UP)
	{
		x_prev = 0; y_prev = 0;
	}
	else							
	{
		if (!((x_prev > event->x + RTGUI_TOUCH_SMOOTH) ||
			(x_prev < event->x - RTGUI_TOUCH_SMOOTH) ||
			(y_prev > event->y + RTGUI_TOUCH_SMOOTH) ||
			(y_prev < event->y - RTGUI_TOUCH_SMOOTH)))
		{
			/* smooth the touch point */
			return RT_FALSE;
		}

x_prev = event->x;
           y_prev = event->y;
	}

/* update touch (x, y) with calibrated data */
	if (_cali_ops != RT_NULL && _cali_ops->calibrate_x != RT_NULL)
		event->x = _cali_ops->calibrate_x(event->x, event->y);	 
	if (_cali_ops != RT_NULL && _cali_ops->calibrate_y != RT_NULL)
		event->y = _cali_ops->calibrate_y(event->x, event->y);

return RT_TRUE;
}
```

```x_prev = event->x;
y_prev = event->y;```这里个人认为似乎有点问题
这里event->x 和event->y  是没经过校准处理的坐标   是否应该在经过处理后在存放在x_prev 和 y_prev中？