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 |
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