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// License Agreement
// For Open Source Computer Vision Library
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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// * The name of the copyright holders may not be used to endorse or promote products
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//M*/
#ifndef OPENCV_CORE_C_H
#define OPENCV_CORE_C_H
#include "opencv2/core/types_c.h"
#ifdef __cplusplus
# ifdef _MSC_VER
/* disable warning C4190: 'function' has C-linkage specified, but returns UDT 'typename'
which is incompatible with C
It is OK to disable it because we only extend few plain structures with
C++ constructors for simpler interoperability with C++ API of the library
*/
# pragma warning(disable:4190)
# elif defined __clang__ && __clang_major__ >= 3
# pragma GCC diagnostic ignored "-Wreturn-type-c-linkage"
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
/** @addtogroup core_c
@{
*/
/****************************************************************************************\
* Array allocation, deallocation, initialization and access to elements *
\****************************************************************************************/
/** `malloc` wrapper.
If there is no enough memory, the function
(as well as other OpenCV functions that call cvAlloc)
raises an error. */
CVAPI(void*) cvAlloc( size_t size );
/** `free` wrapper.
Here and further all the memory releasing functions
(that all call cvFree) take double pointer in order to
to clear pointer to the data after releasing it.
Passing pointer to NULL pointer is Ok: nothing happens in this case
*/
CVAPI(void) cvFree_( void* ptr );
#define cvFree(ptr) (cvFree_(*(ptr)), *(ptr)=0)
/** @brief Creates an image header but does not allocate the image data.
@param size Image width and height
@param depth Image depth (see cvCreateImage )
@param channels Number of channels (see cvCreateImage )
*/
CVAPI(IplImage*) cvCreateImageHeader( CvSize size, int depth, int channels );
/** @brief Initializes an image header that was previously allocated.
The returned IplImage\* points to the initialized header.
@param image Image header to initialize
@param size Image width and height
@param depth Image depth (see cvCreateImage )
@param channels Number of channels (see cvCreateImage )
@param origin Top-left IPL_ORIGIN_TL or bottom-left IPL_ORIGIN_BL
@param align Alignment for image rows, typically 4 or 8 bytes
*/
CVAPI(IplImage*) cvInitImageHeader( IplImage* image, CvSize size, int depth,
int channels, int origin CV_DEFAULT(0),
int align CV_DEFAULT(4));
/** @brief Creates an image header and allocates the image data.
This function call is equivalent to the following code:
@code
header = cvCreateImageHeader(size, depth, channels);
cvCreateData(header);
@endcode
@param size Image width and height
@param depth Bit depth of image elements. See IplImage for valid depths.
@param channels Number of channels per pixel. See IplImage for details. This function only creates
images with interleaved channels.
*/
CVAPI(IplImage*) cvCreateImage( CvSize size, int depth, int channels );
/** @brief Deallocates an image header.
This call is an analogue of :
@code
if(image )
{
iplDeallocate(*image, IPL_IMAGE_HEADER | IPL_IMAGE_ROI);
*image = 0;
}
@endcode
but it does not use IPL functions by default (see the CV_TURN_ON_IPL_COMPATIBILITY macro).
@param image Double pointer to the image header
*/
CVAPI(void) cvReleaseImageHeader( IplImage** image );
/** @brief Deallocates the image header and the image data.
This call is a shortened form of :
@code
if(*image )
{
cvReleaseData(*image);
cvReleaseImageHeader(image);
}
@endcode
@param image Double pointer to the image header
*/
CVAPI(void) cvReleaseImage( IplImage** image );
/** Creates a copy of IPL image (widthStep may differ) */
CVAPI(IplImage*) cvCloneImage( const IplImage* image );
/** @brief Sets the channel of interest in an IplImage.
If the ROI is set to NULL and the coi is *not* 0, the ROI is allocated. Most OpenCV functions do
*not* support the COI setting, so to process an individual image/matrix channel one may copy (via
cvCopy or cvSplit) the channel to a separate image/matrix, process it and then copy the result
back (via cvCopy or cvMerge) if needed.
@param image A pointer to the image header
@param coi The channel of interest. 0 - all channels are selected, 1 - first channel is selected,
etc. Note that the channel indices become 1-based.
*/
CVAPI(void) cvSetImageCOI( IplImage* image, int coi );
/** @brief Returns the index of the channel of interest.
Returns the channel of interest of in an IplImage. Returned values correspond to the coi in
cvSetImageCOI.
@param image A pointer to the image header
*/
CVAPI(int) cvGetImageCOI( const IplImage* image );
/** @brief Sets an image Region Of Interest (ROI) for a given rectangle.
If the original image ROI was NULL and the rect is not the whole image, the ROI structure is
allocated.
Most OpenCV functions support the use of ROI and treat the image rectangle as a separate image. For
example, all of the pixel coordinates are counted from the top-left (or bottom-left) corner of the
ROI, not the original image.
@param image A pointer to the image header
@param rect The ROI rectangle
*/
CVAPI(void) cvSetImageROI( IplImage* image, CvRect rect );
/** @brief Resets the image ROI to include the entire image and releases the ROI structure.
This produces a similar result to the following, but in addition it releases the ROI structure. :
@code
cvSetImageROI(image, cvRect(0, 0, image->width, image->height ));
cvSetImageCOI(image, 0);
@endcode
@param image A pointer to the image header
*/
CVAPI(void)