/*

     File: imageUtil.m

 Abstract: 

 Functions for loading an image files for textures.

  Version: 1.7

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 */

#include "imageUtil.h"

#if ESSENTIAL_GL_PRACTICES_IOS

#import <UIKit/UIKit.h>

#else

#import <Cocoa/Cocoa.h>

#endif

demoImage* imgLoadImage(const char* filepathname, int flipVertical)

{

    NSString *filepathString = [[NSString alloc] initWithUTF8String:filepathname];

#if ESSENTIAL_GL_PRACTICES_IOS

    UIImage* imageClass = [[UIImage alloc] initWithContentsOfFile:filepathString];

#else   

    NSImage *nsimage = [[NSImage alloc] initWithContentsOfFile: filepathString];

    NSBitmapImageRep *imageClass = [[NSBitmapImageRep alloc] initWithData:[nsimage TIFFRepresentation]];

    [nsimage release];

#endif

    CGImageRef cgImage = imageClass.CGImage;

    if (!cgImage)

    { 

        [filepathString release];

        [imageClass release];

        return NULL;

    }

    demoImage* image = malloc(sizeof(demoImage));

    image->width = CGImageGetWidth(cgImage);

    image->height = CGImageGetHeight(cgImage);

    image->rowByteSize = image->width * 4;

    image->data = malloc(image->height * image->rowByteSize);

    image->format = GL_RGBA;

    image->type = GL_UNSIGNED_BYTE;

    CGContextRef context = CGBitmapContextCreate(image->data, image->width, image->height, 8, image->rowByteSize, CGImageGetColorSpace(cgImage), kCGImageAlphaNoneSkipLast);

    CGContextSetBlendMode(context, kCGBlendModeCopy);

    if(flipVertical)

    {

        CGContextTranslateCTM(context, 0.0, image->height);

        CGContextScaleCTM(context, 1.0, -1.0);

    }

    CGContextDrawImage(context, CGRectMake(0.0, 0.0, image->width, image->height), cgImage);

    CGContextRelease(context);

    if(NULL == image->data)

    {

        [filepathString release];

        [imageClass release];

        imgDestroyImage(image);

        return NULL;

    }

    [filepathString release];

    [imageClass release];   

    return image;

}

void imgDestroyImage(demoImage* image)

{

    free(image->data);

    free(image);

}