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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title>Quartz 2D Transformer - /ImageUtils.h</title>
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/GraphicsImaging/index.html">Graphics & Imaging</a> > <a href="../../samplecode/GraphicsImaging/idxQuartz-date.html">Quartz</a> > <A HREF="javascript:location.replace('index.html');">Quartz 2D Transformer</A> >
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<td><h1><div id="pagehead">Quartz 2D Transformer</div></h1></td>
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<h2>/ImageUtils.h</h2>
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<p><strong><a href="CGRotation.zip">Download Sample</a></strong> (“CGRotation.zip”, 157.4K)<BR>
<strong><a href="CGRotation.dmg">Download Sample</a></strong> (“CGRotation.dmg”, 214.0K)</p>
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<pre class="sourcecodebox">/*
File: ImageUtils.h
Abstract: This file declares the core functionality of the sample.
IICreateImage loads and creates the ImageInfo struct that is core to the sample
IISaveImage saves the transformed image to a JPEG.
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
Version: 1.0
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
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POSSIBILITY OF SUCH DAMAGE.
Copyright © 2007 Apple Inc., All Rights Reserved
*/
#include <ApplicationServices/ApplicationServices.h>
#ifdef __cplusplus
extern "C" {
#endif
struct ImageInfo
{
float fRotation; // The rotation about the center of the image (degrees)
float fScaleX; // The scaling of the image along it's X-axis
float fScaleY; // The scaling of the image along it's Y-axis
float fTranslateX; // Move the image along the X-axis
float fTranslateY; // Move the image along the Y-axis
CGImageRef fImageRef; // The image itself
CFDictionaryRef fProperties; // Image properties
CGAffineTransform fOrientation; // Affine transform that ensures the image displays correctly
};
typedef struct ImageInfo ImageInfo;
// All functions are NULL safe.
// 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</pre>
<!--googleoff: index -->
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