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

// ==========================================================
// HDR Loader and writer
//
// Design and implementation by 
// - Hervé Drolon (drolon@infonie.fr)
//
// 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"

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

static int s_format_id;

// ==========================================================
// RGBE library
// ==========================================================

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

// maximum size of a line in the header
#define HDR_MAXLINE	256

// flags indicating which fields in an rgbeHeaderInfo are valid
#define RGBE_VALID_PROGRAMTYPE	0x01
#define RGBE_VALID_COMMENT		0x02
#define RGBE_VALID_GAMMA		0x04
#define RGBE_VALID_EXPOSURE		0x08

// offsets to red, green, and blue components in a data (float) pixel
#define RGBE_DATA_RED    0
#define RGBE_DATA_GREEN  1
#define RGBE_DATA_BLUE   2

// ----------------------------------------------------------
#ifdef _WIN32
#pragma pack(push, 1)
#else
#pragma pack(1)
#endif

typedef struct tagHeaderInfo {
	int valid;					// indicate which fields are valid
	char programtype[16];		// listed at beginning of file to identify it after "#?". defaults to "RGBE"
	char comment[HDR_MAXLINE];	// comment beginning with "# " 
	float gamma;				// image has already been gamma corrected with given gamma. defaults to 1.0 (no correction)
	float exposure;				// a value of 1.0 in an image corresponds to <exposure> watts/steradian/m^2. defaults to 1.0
} rgbeHeaderInfo;

#ifdef _WIN32
#pragma pack(pop)
#else
#pragma pack()
#endif

typedef enum {
	rgbe_read_error,
	rgbe_write_error,
	rgbe_format_error,
	rgbe_memory_error
} rgbe_error_code;

// ----------------------------------------------------------
// Prototypes
// ----------------------------------------------------------

static BOOL rgbe_Error(rgbe_error_code error_code, const char *msg);
static BOOL rgbe_GetLine(FreeImageIO *io, fi_handle handle, char *buffer, int length);
static inline void rgbe_FloatToRGBE(BYTE rgbe[4], FIRGBF *rgbf);
static inline void rgbe_RGBEToFloat(FIRGBF *rgbf, BYTE rgbe[4]);
static BOOL rgbe_ReadHeader(FreeImageIO *io, fi_handle handle, unsigned *width, unsigned *height, rgbeHeaderInfo *header_info);
static BOOL rgbe_WriteHeader(FreeImageIO *io, fi_handle handle, unsigned width, unsigned height, rgbeHeaderInfo *info);
static BOOL rgbe_ReadPixels(FreeImageIO *io, fi_handle handle, FIRGBF *data, unsigned numpixels);
static BOOL rgbe_WritePixels(FreeImageIO *io, fi_handle handle, FIRGBF *data, unsigned numpixels);
static BOOL rgbe_ReadPixels_RLE(FreeImageIO *io, fi_handle handle, FIRGBF *data, int scanline_width, unsigned num_scanlines);
static BOOL rgbe_WriteBytes_RLE(FreeImageIO *io, fi_handle handle, BYTE *data, int numbytes);
static BOOL rgbe_WritePixels_RLE(FreeImageIO *io, fi_handle handle, FIRGBF *data, unsigned scanline_width, unsigned num_scanlines);
static BOOL rgbe_ReadMetadata(FIBITMAP *dib, rgbeHeaderInfo *header_info);
static BOOL rgbe_WriteMetadata(FIBITMAP *dib, rgbeHeaderInfo *header_info);

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

/**
Default error routine.  change this to change error handling 
*/
static BOOL  
rgbe_Error(rgbe_error_code error_code, const char *msg) {
	switch (error_code) {
		case rgbe_read_error:
			FreeImage_OutputMessageProc(s_format_id, "RGBE read error");
			break;
		case rgbe_write_error:
			FreeImage_OutputMessageProc(s_format_id, "RGBE write error");