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src/Source/FreeImage/PluginEXR.cpp  view on Meta::CPAN

// ==========================================================
// EXR Loader and writer
//
// Design and implementation by 
// - Hervé Drolon (drolon@infonie.fr)
// - Mihail Naydenov (mnaydenov@users.sourceforge.net)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

#include "FreeImage.h"
#include "Utilities.h"

#ifdef _MSC_VER
// OpenEXR has many problems with MSVC warnings (why not just correct them ?), just ignore one of them
#pragma warning (disable : 4800) // ImfVersion.h - 'const int' : forcing value to bool 'true' or 'false' (performance warning)
#endif 

#include "../OpenEXR/IlmImf/ImfIO.h"
#include "../OpenEXR/Iex/Iex.h"
#include "../OpenEXR/IlmImf/ImfOutputFile.h"
#include "../OpenEXR/IlmImf/ImfInputFile.h"
#include "../OpenEXR/IlmImf/ImfRgbaFile.h"
#include "../OpenEXR/IlmImf/ImfChannelList.h"
#include "../OpenEXR/IlmImf/ImfRgba.h"
#include "../OpenEXR/IlmImf/ImfArray.h"
#include "../OpenEXR/IlmImf/ImfPreviewImage.h"
#include "../OpenEXR/Half/half.h"


// ==========================================================
// Plugin Interface
// ==========================================================

static int s_format_id;

// ----------------------------------------------------------

/**
FreeImage input stream wrapper
@see Imf_2_2::IStream
*/
class C_IStream : public Imf::IStream {
private:
    FreeImageIO *_io;
	fi_handle _handle;

public:
	C_IStream (FreeImageIO *io, fi_handle handle) : 
	  Imf::IStream(""), _io (io), _handle(handle) {
	}

	virtual bool read (char c[/*n*/], int n) {
		return ((unsigned)n != _io->read_proc(c, 1, n, _handle));
	}

	virtual Imath::Int64 tellg() {
		return _io->tell_proc(_handle);
	}

	virtual void seekg(Imath::Int64 pos) {
		_io->seek_proc(_handle, (unsigned)pos, SEEK_SET);
	}

	virtual void clear() {
	}
};

// ----------------------------------------------------------

/**
FreeImage output stream wrapper
@see Imf_2_2::OStream
*/
class C_OStream : public Imf::OStream {
private:
    FreeImageIO *_io;
	fi_handle _handle;

public:
	C_OStream (FreeImageIO *io, fi_handle handle) : 
	  Imf::OStream(""), _io (io), _handle(handle) {
	}

	virtual void write(const char c[/*n*/], int n) {
		if((unsigned)n != _io->write_proc((void*)&c[0], 1, n, _handle)) {
			Iex::throwErrnoExc();
		}
	}

	virtual Imath::Int64 tellp() {
		return _io->tell_proc(_handle);
	}

	virtual void seekp(Imath::Int64 pos) {
		_io->seek_proc(_handle, (unsigned)pos, SEEK_SET);
	}
};

// ----------------------------------------------------------


// ==========================================================
// Plugin Implementation
// ==========================================================

static const char * DLL_CALLCONV
Format() {
	return "EXR";
}

static const char * DLL_CALLCONV
Description() {
	return "ILM OpenEXR";
}

static const char * DLL_CALLCONV
Extension() {
	return "exr";
}

static const char * DLL_CALLCONV
RegExpr() {
	return NULL;
}

static const char * DLL_CALLCONV
MimeType() {
	return "image/x-exr";
}

static BOOL DLL_CALLCONV
Validate(FreeImageIO *io, fi_handle handle) {
	BYTE exr_signature[] = { 0x76, 0x2F, 0x31, 0x01 };
	BYTE signature[] = { 0, 0, 0, 0 };

	io->read_proc(signature, 1, 4, handle);
	return (memcmp(exr_signature, signature, 4) == 0);
}