/*

     File: OpenGLViewPixels.m

 Abstract: 

 Utility function for copying pixels from an OpenGL view.

  Version: 1.2

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 */

//------------------------------------------------------------------------

//------------------------------------------------------------------------

#import "OpenGLViewPixels.h"

//------------------------------------------------------------------------

//------------------------------------------------------------------------

@implementation OpenGLViewPixels

//------------------------------------------------------------------------

//------------------------------------------------------------------------

- (id) initViewPixelsWithFrame:(const NSRect *)theFrame

                          view:(NSOpenGLView *)theBaseView

{

    NSRect subFrameUpdated;

    if( theFrame == NULL )

    {

        subFrameUpdated = [theBaseView bounds];

    } // if

    else

    {

        subFrameUpdated = *theFrame;

        if( NSIsEmptyRect( subFrameUpdated ) )

        {

            subFrameUpdated = [theBaseView bounds];

        } // if

    } // else

    self = [super initPBOPackWithSize:&subFrameUpdated.size

                                usage:GL_STREAM_READ

                                 mode:GL_BACK];

    if( self )

    {

        mpView     = theBaseView;

        m_Frame = subFrameUpdated;

    } // if

    return( self );

} // initViewPixelsWithFrame

//------------------------------------------------------------------------

- (void) dealloc

{

    // Dealloc the superclass

    [super dealloc];

} // dealloc

//---------------------------------------------------------------------------

+ (id) viewPixelsWithFrame:(const NSRect *)theFrame

                      view:(NSOpenGLView *)theBaseView

{

    return( [[[OpenGLViewPixels allocWithZone:[self zone]] initViewPixelsWithFrame:theFrame

                                                                              view:theBaseView] autorelease] );

} // viewPixelsWithFrame

//------------------------------------------------------------------------

- (void) setFrame:(const NSRect *)theFrame

{

    if( theFrame == NULL )

    {

        m_Frame = [mpView bounds];

    } // if

    else

    {

        m_Frame = *theFrame;

        if( NSIsEmptyRect( m_Frame ) )

        {

            m_Frame = [mpView bounds];

        } // if

    } // else

    [self setSize:&m_Frame.size];

} // pixelsSetFrame

//------------------------------------------------------------------------

- (GLvoid *) pixels

{

    [self read:YES];

    return( [self data] );

} // pixels

//---------------------------------------------------------------------------

#pragma mark -

#pragma mark Accessor

//------------------------------------------------------------------------

- (NSRect) frame

{

    return( m_Frame );

} // frame

//---------------------------------------------------------------------------

- (GLuint) rowbytes

{

    return( [self rowbytes] );

} // size

//------------------------------------------------------------------------

@end

//------------------------------------------------------------------------

//------------------------------------------------------------------------