update: 2012/09/03
A. 說明:
在 實作 28 中, 於 captureOutput:didOutputSampleBuffer: fromConnection:
方法裡, 我們利用了 CGRectMake 來建立要畫到 render buffer 的目標矩形大小.
寬度固定為: self.view.frame.size.width
高度固定為: self.view.frame.size.height
當時並沒有考慮到設備方向改變時的情況, 因此當設備水平擺放時, 就會發生
寬度被切掉的情況, 因此要做一些調整.
說明: 影像被切掉的地方顯示為黑色.
------------------------------------------------------------------------
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B. 開啟 ViewController.h 檔案, 修改如下:
....
@interface ViewController : GLKViewController <AVCaptureVideoDataOutputSampleBufferDelegate, UITableViewDelegate, UITableViewDataSource>
{
....
// 目前使用的濾鏡物件
FilterBase *currentFilter;
//@add: 影像視窗的大小
CGRect destRect;
}
....
@property (nonatomic, strong) FilterBase *currentFilter;
//@add
@property (assign) CGRect destRect;
....
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C. 開啟 ViewController.m 檔案, 修改如下:
....
// step 01:
@synthesize dataObj = _dataObj;
@synthesize currentFilter = _currentFilter;
//@add
@synthesize destRect = _destRect;
....
// step 02:
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
....
//@update: comment it
/*
//@add
CGRect destRect = CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y,
self.view.frame.size.width,
self.view.frame.size.height);
*/
//@add: 根據設備擺放方向來設定 "影像視窗大小" 的長寬
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
// 設備垂直擺放
if (orientation == UIDeviceOrientationPortrait ||
orientation == UIDeviceOrientationPortraitUpsideDown)
{
self.destRect = CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y,
self.view.frame.size.width,
self.view.frame.size.height);
}
// 設備水平擺放
else if (orientation == UIDeviceOrientationLandscapeRight ||
orientation == UIDeviceOrientationLandscapeLeft)
{
self.destRect = CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y,
self.view.frame.size.height,
self.view.frame.size.width);
}
// 設備: 面朝上, 面朝下, 未知
else
{
// Do Nothing
}
// 然後使用 CIContext 物件將其內容畫到 render buffer
//[self.coreImageContext drawImage:self.ciImage inRect:destRect fromRect:[self.ciImage extent]];
//@update
[self.coreImageContext drawImage:self.ciImage inRect:self.destRect fromRect:[self.ciImage extent]];
// 最後, 在螢幕上呈現出來.
[self.glContext presentRenderbuffer:GL_RENDERBUFFER];
}
....
// step 03:
- (void)viewDidLoad
{
....
//@add
self.destRect = CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y,
self.view.frame.size.width,
self.view.frame.size.height);
//@add: establish Render
[self establishRender];
//@add: establishCamera
[self establishCamera:kCameraBack];
//@add test for cameraOverlay
//[self cameraOverlayTest];
//@add for setting camera Overlay
[self cameraOverlay];
//@add: startRunning
[self startRunningSession];
//@add for initialize reusableCells
[self initReusableCells];
}
....
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D. 編譯並執行:
拍照畫面(水平擺放)
