ImageUtils.h

/*
    File: ImageUtils.h
Abstract: Contains the core functionality of the sample.
 Version: 1.2
 
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*/
 
//  IICreateImage loads and creates the ImageInfo struct that is core to the sample
//  IISaveImage saves the transformed image to a PNG.
//  IIApplyTransformation shows how to rotate about center, scale, and translate the image
//  IIDrawImage draws the image into the given context
//  IIDrawImageTransformed calls IIApplyTransformation and IIDrawImage to do both at once while preserving the original context's CTM
//  IIRelease releases the ImageInfo struct allocated by IICreateImage
 
#include <ApplicationServices/ApplicationServices.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct ImageInfo
{
    CGFloat rotation;           // The rotation about the center of the image (degrees)
    CGFloat scaleX;             // The scaling of the image along it's X-axis
    CGFloat scaleY;             // The scaling of the image along it's Y-axis
    CGFloat translateX;         // Move the image along the X-axis
    CGFloat translateY;         // Move the image along the Y-axis
    CGImageRef image;           // The image itself
    CFDictionaryRef properties; // Image properties
};
typedef struct ImageInfo ImageInfo;
 
// Create a new image from a file at the given url
// Returns NULL if unsuccessful.
ImageInfo * IICreateImage(CFURLRef url);
 
// Save the given image to a file at the given url with the given size.
// Returns true if successful, false otherwise.
bool IISaveImage(ImageInfo * image, CFURLRef url, size_t width, size_t height);
 
// Draw the image to the given context centered inside the given bounds
void IIDrawImage(ImageInfo * image, CGContextRef context, CGRect bounds);
 
// Applies the transformations specified in the ImageInfo struct without drawing the actual image
void IIApplyTransformation(ImageInfo * image, CGContextRef context, CGRect bounds);
 
// Draw the image to the given context centered inside the given bounds with
// the transformation info. The CTM of the context is unchanged after this call
void IIDrawImageTransformed(ImageInfo * image, CGContextRef context, CGRect bounds);
 
// Release the ImageInfo struct and other associated data
// you should not refer to the reference after this call
void IIRelease(ImageInfo * image);
 
#ifdef __cplusplus
}
#endif