/*

     File: CGBitmap.m

 Abstract: 

 Utility functions for converting RGB pixels into RGBA CG image opaque references.

  Version: 1.2

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 */

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

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

#import "OpenGLTextureSourceTypes.h"

#import "CGBitmap.h"

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

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

struct CGBitmap

{

    GLboolean        mbIsOwned;

    GLuint           mnBitsPerComponent;

    GLuint           mnSamplesPerPixel;

    GLuint           mnHeight;              // The height (in pixels) of the buffer

    GLuint           mnWidth;               // The width (in pixels) of the buffer

    GLuint           mnRowBytes;            // The number of bytes in a pixel row

    GLuint           mnSize;                // The image size

    GLvoid          *mpPixels;              // Pointer to the top left pixel of the buffer

    CGBitmapInfo     mnBitmapInfo;

    CFStringRef      mpColorSpaceName;

    CGColorSpaceRef  mpColorSpace;

    CGContextRef     mpContext;

};

typedef struct CGBitmap   CGBitmap;

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

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

BOOL CGBitmapRelease( CGBitmapRef pBitmapImage )

{

    BOOL  bSuccess = NO;

    if( pBitmapImage != NULL )

    {

        if( pBitmapImage->mpColorSpace != NULL )

        {

            CGColorSpaceRelease( pBitmapImage->mpColorSpace );

            pBitmapImage->mpColorSpace = NULL;

        } // if

        if( pBitmapImage->mpContext != NULL )

        {

            CGContextRelease( pBitmapImage->mpContext );

            pBitmapImage->mpContext = NULL;

        } // if

        free( pBitmapImage );

        pBitmapImage = NULL;

        bSuccess = YES;

    } // if

    return( bSuccess );

} // CGBitmapRelease

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

static void CGBitmapSetProperties(const NSSize *pSize,

                                  const CGImageAlphaInfo nAlphaInfo,

                                  void *pPixels,

                                  CGBitmapRef pBitmapImage)

{

    pBitmapImage->mpColorSpaceName = kCGColorSpaceGenericRGB;

    pBitmapImage->mpColorSpace     = CGColorSpaceCreateWithName(pBitmapImage->mpColorSpaceName);

    if( pBitmapImage->mpColorSpace != NULL )

    {

        pBitmapImage->mnSamplesPerPixel  = kTextureMaxSPP;

        pBitmapImage->mnBitsPerComponent = kTextureMaxBPS;

        pBitmapImage->mpPixels           = pPixels;

        pBitmapImage->mnWidth            = (GLuint)pSize->width;

        pBitmapImage->mnHeight           = (GLuint)pSize->height;

        pBitmapImage->mnRowBytes         = pBitmapImage->mnSamplesPerPixel * pBitmapImage->mnWidth;

        pBitmapImage->mnSize             = pBitmapImage->mnRowBytes * pBitmapImage->mnHeight;

        pBitmapImage->mnBitmapInfo       = nAlphaInfo | kCGBitmapByteOrder32Little; // XRGB Little Endian

        pBitmapImage->mpContext = CGBitmapContextCreate(pBitmapImage->mpPixels,

                                                        pBitmapImage->mnWidth,

                                                        pBitmapImage->mnHeight,

                                                        pBitmapImage->mnBitsPerComponent,

                                                        pBitmapImage->mnRowBytes,

                                                        pBitmapImage->mpColorSpace,

                                                        pBitmapImage->mnBitmapInfo);

    } // if

} // CGBitmapSetProperties

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

CGBitmapRef CGBitmapCreateWithPixels(const NSSize *pSize,

                                     const CGImageAlphaInfo nAlphaInfo,

                                     void *pPixels)

{

    CGBitmapRef pBitmapImage = NULL;

    if( pPixels != NULL )

    {

        pBitmapImage = (CGBitmapRef)calloc(1,sizeof(CGBitmap));

        if( pBitmapImage != NULL )

        {

            pBitmapImage->mbIsOwned = GL_FALSE;

            CGBitmapSetProperties(pSize, nAlphaInfo, pPixels, pBitmapImage);

        } // if

    } // if

    return( pBitmapImage );

} // CGBitmapCreateWithPixels

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

CGBitmapRef CGBitmapCreate(const NSSize *pSize,

                           const CGImageAlphaInfo nAlphaInfo)

{

    CGBitmapRef pBitmapImage = (CGBitmapRef)calloc(1,sizeof(CGBitmap));

    if( pBitmapImage != NULL )

    {

        pBitmapImage->mbIsOwned = GL_TRUE;

        CGBitmapSetProperties(pSize, nAlphaInfo, NULL, pBitmapImage);

    } // if

    return( pBitmapImage );

} // CGBitmapCreate

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

CGBitmapRef CGBitmapCreateCopy(CGBitmapRef pBitmapImageSrc)

{

    CGBitmapRef pBitmapImageDst = (CGBitmapRef)calloc(1,sizeof(CGBitmap));

    if( pBitmapImageDst != NULL )

    {

        pBitmapImageDst->mbIsOwned        = pBitmapImageSrc->mbIsOwned;

        pBitmapImageDst->mpColorSpaceName = pBitmapImageSrc->mpColorSpaceName;

        pBitmapImageDst->mpColorSpace     = CGColorSpaceCreateWithName(pBitmapImageDst->mpColorSpaceName);

        if( pBitmapImageDst->mpColorSpace != NULL )

        {

            pBitmapImageDst->mnSamplesPerPixel  = kTextureMaxSPP;

            pBitmapImageDst->mnBitsPerComponent = kTextureMaxBPS;

            pBitmapImageDst->mpPixels           = pBitmapImageSrc->mpPixels;

            pBitmapImageDst->mnWidth            = pBitmapImageSrc->mnWidth;

            pBitmapImageDst->mnHeight           = pBitmapImageSrc->mnHeight;

            pBitmapImageDst->mnRowBytes         = pBitmapImageSrc->mnRowBytes;

            pBitmapImageDst->mnSize             = pBitmapImageSrc->mnSize;

            pBitmapImageDst->mnBitmapInfo       = pBitmapImageSrc->mnBitmapInfo;

            pBitmapImageDst->mpContext = CGBitmapContextCreate(pBitmapImageDst->mpPixels,

                                                               pBitmapImageDst->mnWidth,

                                                               pBitmapImageDst->mnHeight,

                                                               pBitmapImageDst->mnBitsPerComponent,

                                                               pBitmapImageDst->mnRowBytes,

                                                               pBitmapImageDst->mpColorSpace,

                                                               pBitmapImageDst->mnBitmapInfo);

        } // if

    } // if

    return( pBitmapImageDst );

} // CGBitmapCreateCopy

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

void CGBitmapSetPixels(void *pPixels,

                       CGBitmapRef pBitmapImage)

{

    if( ( pPixels != NULL ) && ( !pBitmapImage->mbIsOwned ) )

    {

        pBitmapImage->mpPixels = pPixels;

    } // if

} // CGBitmapSetPixels

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

void CGBitmapSetShouldAntialias(const bool bShouldAntialias,

                                CGBitmapRef pBitmapImage)

{

    CGContextSetShouldAntialias(pBitmapImage->mpContext, bShouldAntialias);

} // CGBitmapSetShouldAntialias

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

void CGBitmapSetBlendMode(const CGBlendMode nMode,

                          CGBitmapRef pBitmapImage)

{

    CGContextSetBlendMode(pBitmapImage->mpContext, nMode);

} // CGBitmapSetBlendMode

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

GLuint CGBitmapGetWidth(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnWidth );

} // CGBitmapGetWidth

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

GLuint CGBitmapGetHeight(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnHeight );

} // CGBitmapGetHeight

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

GLuint CGBitmapGetRowBytes(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnRowBytes );

} // CGBitmapGetRowBytes

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

GLuint CGBitmapGetSize(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnSize );

} // CGBitmapGetSize

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

GLuint CGBitmapGetBitsPerComponent(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnBitsPerComponent );

} // CGBitmapGetBitsPerComponent

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

GLuint CGBitmapGetSamplesPerPixel(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnSamplesPerPixel );

} // CGBitmapGetSamplesPerPixel

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

CGBitmapInfo CGBitmapGetBitmapInfo(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mnBitmapInfo );

} // CGBitmapGetBitmapInfo

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

CGColorSpaceRef CGBitmapGetColorSpace(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mpColorSpace );

} // CGBitmapGetColorSpace

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

CGContextRef CGBitmapGetContext(CGBitmapRef pBitmapImage)

{

    return( pBitmapImage->mpContext );

} // CGBitmapGetContext

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

void *CGBitmapGetPixels(CGBitmapRef pBitmapImage)

{

    return( CGBitmapContextGetData(pBitmapImage->mpContext) );

} // CGBitmapGetPixels

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

void CGBitmapCopyPixels(const void *pPixelsSrc,

                        CGBitmapRef pBitmapImage)

{

    if( pPixelsSrc != NULL )

    {

        void *pPixelsDst = (pBitmapImage->mbIsOwned)

        ? CGBitmapContextGetData(pBitmapImage->mpContext)

        : pBitmapImage->mpPixels;

        memcpy( pPixelsDst, pPixelsSrc, pBitmapImage->mnSize );

    } // if

} // CGBitmapCopyPixels

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

CGImageRef CGBitmapCreateImage(CGBitmapRef pBitmapImage)

{

    CGImageRef imageRef = NULL;

    if( ( pBitmapImage != NULL ) && ( pBitmapImage->mpContext != NULL ) )

    {

        // Create a new image from the bitmap context

        imageRef = CGBitmapContextCreateImage( pBitmapImage->mpContext );

    } // if

    return( imageRef );

} // CGBitmapCreateImage

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

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