lcms/src/lcms2_internal.h

//
//  Little Color Management System
//  Copyright (c) 1998-2016 Marti Maria Saguer
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//---------------------------------------------------------------------------------
//

#ifndef _lcms_internal_H

// Include plug-in foundation
#ifndef _lcms_plugin_H
#   include "third_party/lcms/include/lcms2_plugin.h"
#endif

// ctype is part of C99 as per 7.1.2
#include <ctype.h>

// assert macro is part of C99 as per 7.2
#include <assert.h>

// Some needed constants
#ifndef M_PI
#       define M_PI        3.14159265358979323846
#endif

#ifndef M_LOG10E
#       define M_LOG10E    0.434294481903251827651
#endif

// BorlandC 5.5, VC2003 are broken on that
#if defined(__BORLANDC__) || (_MSC_VER < 1400) // 1400 == VC++ 8.0
#define sinf(x) (float)sin((float)x)
#define sqrtf(x) (float)sqrt((float)x)
#endif


// Alignment of ICC file format uses 4 bytes (cmsUInt32Number)
#define _cmsALIGNLONG(x) (((x)+(sizeof(cmsUInt32Number)-1)) & ~(sizeof(cmsUInt32Number)-1))

// Alignment to memory pointer

// (Ultra)SPARC with gcc requires ptr alignment of 8 bytes
// even though sizeof(void *) is only four: for greatest flexibility
// allow the build to specify ptr alignment.
#ifndef CMS_PTR_ALIGNMENT
# define CMS_PTR_ALIGNMENT sizeof(void *)
#endif

#define _cmsALIGNMEM(x)  (((x)+(CMS_PTR_ALIGNMENT - 1)) & ~(CMS_PTR_ALIGNMENT - 1))

// Maximum encodeable values in floating point
#define MAX_ENCODEABLE_XYZ  (1.0 + 32767.0/32768.0)
#define MIN_ENCODEABLE_ab2  (-128.0)
#define MAX_ENCODEABLE_ab2  ((65535.0/256.0) - 128.0)
#define MIN_ENCODEABLE_ab4  (-128.0)
#define MAX_ENCODEABLE_ab4  (127.0)

// Maximum of channels for internal pipeline evaluation
#define MAX_STAGE_CHANNELS  128

// Unused parameter warning supression
#define cmsUNUSED_PARAMETER(x) ((void)x)

// The specification for "inline" is section 6.7.4 of the C99 standard (ISO/IEC 9899:1999).
// unfortunately VisualC++ does not conform that
#if defined(_MSC_VER) || defined(__BORLANDC__)
#   define cmsINLINE __inline
#else
#   define cmsINLINE static inline
#endif

// Other replacement functions
#ifdef _MSC_VER
# ifndef snprintf
#       define snprintf  _snprintf
# endif
# ifndef vsnprintf
#       define vsnprintf  _vsnprintf
# endif
#endif


// A fast way to convert from/to 16 <-> 8 bits
#define FROM_8_TO_16(rgb) (cmsUInt16Number) ((((cmsUInt16Number) (rgb)) << 8)|(rgb))
#define FROM_16_TO_8(rgb) (cmsUInt8Number) ((((cmsUInt32Number)(rgb) * 65281U + 8388608U) >> 24) & 0xFFU)

// Code analysis is broken on asserts
#ifdef _MSC_VER
#    if (_MSC_VER >= 1500)
#            define _cmsAssert(a)  { assert((a)); __analysis_assume((a)); }
#     else
#            define _cmsAssert(a)   assert((a))
#     endif
#else
#      define _cmsAssert(a)   assert((a))
#endif

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

// Determinant lower than that are assumed zero (used on matrix invert)
#define MATRIX_DET_TOLERANCE    0.0001

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

// Fixed point
#define FIXED_TO_INT(x)         ((x)>>16)
#define FIXED_REST_TO_INT(x)    ((x)&0xFFFFU)
#define ROUND_FIXED_TO_INT(x)   (((x)+0x8000)>>16)

cmsINLINE cmsS15Fixed16Number _cmsToFixedDomain(int a)                   { return a + ((a + 0x7fff) / 0xffff); }
cmsINLINE int                 _cmsFromFixedDomain(cmsS15Fixed16Number a) { return a - ((a + 0x7fff) >> 16); }

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

// Fast floor conversion logic. Thanks to Sree Kotay and Stuart Nixon
// note than this only works in the range ..-32767...+32767 because
// mantissa is interpreted as 15.16 fixed point.
// The union is to avoid pointer aliasing overoptimization.
cmsINLINE int _cmsQuickFloor(cmsFloat64Number val)
{
#ifdef CMS_DONT_USE_FAST_FLOOR
    return (int) floor(val);
#else
    const cmsFloat64Number _lcms_double2fixmagic = 68719476736.0 * 1.5;  // 2^36 * 1.5, (52-16=36) uses limited precision to floor
    union {
        cmsFloat64Number val;
        int halves[2];
    } temp;

    temp.val = val + _lcms_double2fixmagic;

#ifdef CMS_USE_BIG_ENDIAN
    return temp.halves[1] >> 16;
#else
    return temp.halves[0] >> 16;
#endif
#endif
}

// Fast floor restricted to 0..65535.0
cmsINLINE cmsUInt16Number _cmsQuickFloorWord(cmsFloat64Number d)
{
    return (cmsUInt16Number) _cmsQuickFloor(d - 32767.0) + 32767U;
}

// Floor to word, taking care of saturation
cmsINLINE cmsUInt16Number _cmsQuickSaturateWord(cmsFloat64Number d)
{
    d += 0.5;
    if (d <= 0) return 0;
    if (d >= 65535.0) return 0xffff;

    return _cmsQuickFloorWord(d);
}


// Pthread support --------------------------------------------------------------------
#ifndef CMS_NO_PTHREADS

// This is the threading support. Unfortunately, it has to be platform-dependent because
// windows does not support pthreads.

#ifdef CMS_IS_WINDOWS_

#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>


// From: http://locklessinc.com/articles/pthreads_on_windows/
// The pthreads API has an initialization macro that has no correspondence to anything in
// the windows API. By investigating the internal definition of the critical section type,
// one may work out how to initialize one without calling InitializeCriticalSection().
// The trick here is that InitializeCriticalSection() is not allowed to fail. It tries
// to allocate a critical section debug object, but if no memory is available, it sets
// the pointer to a specific value. (One would expect that value to be NULL, but it is
// actually (void *)-1 for some reason.) Thus we can use this special value for that
// pointer, and the critical section code will work.

// The other important part of the critical section type to initialize is the number
// of waiters. This controls whether or not the mutex is locked. Fortunately, this
// part of the critical section is unlikely to change. Apparently, many programs
// already test critical sections to see if they are locked using this value, so
// Microsoft felt that it was necessary to keep it set at -1 for an unlocked critical
// section, even when they changed the underlying algorithm to be more scalable.
// The final parts of the critical section object are unimportant, and can be set
// to zero for their defaults. This yields to an initialization macro:

typedef CRITICAL_SECTION _cmsMutex;

#define CMS_MUTEX_INITIALIZER {(PRTL_CRITICAL_SECTION_DEBUG) -1,-1,0,0,0,0}

#ifdef _MSC_VER
#    if (_MSC_VER >= 1800)
#          pragma warning(disable : 26135)
#    endif
#endif

cmsINLINE int _cmsLockPrimitive(_cmsMutex *m)
{
	EnterCriticalSection(m);
	return 0;
}

cmsINLINE int _cmsUnlockPrimitive(_cmsMutex *m)
{
	LeaveCriticalSection(m);
	return 0;
}

cmsINLINE int _cmsInitMutexPrimitive(_cmsMutex *m)
{
	InitializeCriticalSection(m);
	return 0;
}

cmsINLINE int _cmsDestroyMutexPrimitive(_cmsMutex *m)
{
	DeleteCriticalSection(m);
	return 0;
}

cmsINLINE int _cmsEnterCriticalSectionPrimitive(_cmsMutex *m)
{
	EnterCriticalSection(m);
	return 0;
}

cmsINLINE int _cmsLeaveCriticalSectionPrimitive(_cmsMutex *m)
{
	LeaveCriticalSection(m);
	return 0;
}

#else

// Rest of the wide world
#include <pthread.h>

#define CMS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
typedef pthread_mutex_t _cmsMutex;


cmsINLINE int _cmsLockPrimitive(_cmsMutex *m)
{
	return pthread_mutex_lock(m);
}

cmsINLINE int _cmsUnlockPrimitive(_cmsMutex *m)
{
	return pthread_mutex_unlock(m);
}

cmsINLINE int _cmsInitMutexPrimitive(_cmsMutex *m)
{
	return pthread_mutex_init(m, NULL);
}

cmsINLINE int _cmsDestroyMutexPrimitive(_cmsMutex *m)
{
	return pthread_mutex_destroy(m);
}

cmsINLINE int _cmsEnterCriticalSectionPrimitive(_cmsMutex *m)
{
	return pthread_mutex_lock(m);
}

cmsINLINE int _cmsLeaveCriticalSectionPrimitive(_cmsMutex *m)
{
	return pthread_mutex_unlock(m);
}

#endif
#else

#define CMS_MUTEX_INITIALIZER 0
typedef int _cmsMutex;


cmsINLINE int _cmsLockPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}

cmsINLINE int _cmsUnlockPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}

cmsINLINE int _cmsInitMutexPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}

cmsINLINE int _cmsDestroyMutexPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}

cmsINLINE int _cmsEnterCriticalSectionPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}

cmsINLINE int _cmsLeaveCriticalSectionPrimitive(_cmsMutex *m)
{
    cmsUNUSED_PARAMETER(m);
	return 0;
}
#endif

// Plug-In registration ---------------------------------------------------------------

// Specialized function for plug-in memory management. No pairing free() since whole pool is freed at once.
void* _cmsPluginMalloc(cmsContext ContextID, cmsUInt32Number size);

// Memory management
cmsBool   _cmsRegisterMemHandlerPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Interpolation
cmsBool  _cmsRegisterInterpPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Parametric curves
cmsBool  _cmsRegisterParametricCurvesPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Formatters management
cmsBool  _cmsRegisterFormattersPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Tag type management
cmsBool  _cmsRegisterTagTypePlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Tag management
cmsBool  _cmsRegisterTagPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Intent management
cmsBool  _cmsRegisterRenderingIntentPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Multi Process elements
cmsBool  _cmsRegisterMultiProcessElementPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Optimization
cmsBool  _cmsRegisterOptimizationPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Transform
cmsBool  _cmsRegisterTransformPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

// Mutex
cmsBool _cmsRegisterMutexPlugin(cmsContext ContextID, cmsPluginBase* Plugin);

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

// Suballocators.
typedef struct _cmsSubAllocator_chunk_st {

    cmsUInt8Number* Block;
    cmsUInt32Number BlockSize;
    cmsUInt32Number Used;

    struct _cmsSubAllocator_chunk_st* next;

} _cmsSubAllocator_chunk;


typedef struct {

    cmsContext ContextID;
    _cmsSubAllocator_chunk* h;

} _cmsSubAllocator;


_cmsSubAllocator* _cmsCreateSubAlloc(cmsContext ContextID, cmsUInt32Number Initial);
void              _cmsSubAllocDestroy(_cmsSubAllocator* s);
void*             _cmsSubAlloc(_cmsSubAllocator* s, cmsUInt32Number size);
void*             _cmsSubAllocDup(_cmsSubAllocator* s, const void *ptr, cmsUInt32Number size);

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

// The context clients.
typedef enum {

    UserPtr,            // User-defined pointer
    Logger,
    AlarmCodesContext,
    AdaptationStateContext,
    MemPlugin,
    InterpPlugin,
    CurvesPlugin,
    FormattersPlugin,
    TagTypePlugin,
    TagPlugin,
    IntentPlugin,
    MPEPlugin,
    OptimizationPlugin,
    TransformPlugin,
    MutexPlugin,

    // Last in list
    MemoryClientMax

} _cmsMemoryClient;


// Container for memory management plug-in.
typedef struct {

    _cmsMallocFnPtrType     MallocPtr;
    _cmsMalloZerocFnPtrType MallocZeroPtr;
    _cmsFreeFnPtrType       FreePtr;
    _cmsReallocFnPtrType    ReallocPtr;
    _cmsCallocFnPtrType     CallocPtr;
    _cmsDupFnPtrType        DupPtr;

} _cmsMemPluginChunkType;

// Copy memory management function pointers from plug-in to chunk, taking care of missing routines
void  _cmsInstallAllocFunctions(cmsPluginMemHandler* Plugin, _cmsMemPluginChunkType* ptr);

// Internal structure for context
struct _cmsContext_struct {

    struct _cmsContext_struct* Next;  // Points to next context in the new style
    _cmsSubAllocator* MemPool;        // The memory pool that stores context data

    void* chunks[MemoryClientMax];    // array of pointers to client chunks. Memory itself is hold in the suballocator.
                                      // If NULL, then it reverts to global Context0

    _cmsMemPluginChunkType DefaultMemoryManager;  // The allocators used for creating the context itself. Cannot be overriden
};

// Returns a pointer to a valid context structure, including the global one if id is zero.
// Verifies the magic number.
struct _cmsContext_struct* _cmsGetContext(cmsContext ContextID);

// Returns the block assigned to the specific zone.
void*     _cmsContextGetClientChunk(cmsContext id, _cmsMemoryClient mc);


// Chunks of context memory by plug-in client -------------------------------------------------------

// Those structures encapsulates all variables needed by the several context clients (mostly plug-ins)

// Container for error logger -- not a plug-in
typedef struct {

    cmsLogErrorHandlerFunction LogErrorHandler;  // Set to NULL for Context0 fallback

} _cmsLogErrorChunkType;

// The global Context0 storage for error logger
extern  _cmsLogErrorChunkType  _cmsLogErrorChunk;

// Allocate and init error logger container.
void _cmsAllocLogErrorChunk(struct _cmsContext_struct* ctx,
                            const struct _cmsContext_struct* src);

// Container for alarm codes -- not a plug-in
typedef struct {

    cmsUInt16Number AlarmCodes[cmsMAXCHANNELS];

} _cmsAlarmCodesChunkType;

// The global Context0 storage for alarm codes
extern  _cmsAlarmCodesChunkType _cmsAlarmCodesChunk;

// Allocate and init alarm codes container.
void _cmsAllocAlarmCodesChunk(struct _cmsContext_struct* ctx,
                            const struct _cmsContext_struct* src);

// Container for adaptation state -- not a plug-in
typedef struct {

    cmsFloat64Number  AdaptationState;

} _cmsAdaptationStateChunkType;

// The global Context0 storage for adaptation state
extern  _cmsAdaptationStateChunkType    _cmsAdaptationStateChunk;

// Allocate and init adaptation state container.
void _cmsAllocAdaptationStateChunk(struct _cmsContext_struct* ctx,
                                   const struct _cmsContext_struct* src);


// The global Context0 storage for memory management
extern  _cmsMemPluginChunkType _cmsMemPluginChunk;

// Allocate and init memory management container.
void _cmsAllocMemPluginChunk(struct _cmsContext_struct* ctx,
                             const struct _cmsContext_struct* src);

// Container for interpolation plug-in
typedef struct {

    cmsInterpFnFactory Interpolators;

} _cmsInterpPluginChunkType;

// The global Context0 storage for interpolation plug-in
extern  _cmsInterpPluginChunkType _cmsInterpPluginChunk;

// Allocate and init interpolation container.
void _cmsAllocInterpPluginChunk(struct _cmsContext_struct* ctx,
                                const struct _cmsContext_struct* src);

// Container for parametric curves plug-in
typedef struct {

    struct _cmsParametricCurvesCollection_st* ParametricCurves;

} _cmsCurvesPluginChunkType;

// The global Context0 storage for tone curves plug-in
extern  _cmsCurvesPluginChunkType _cmsCurvesPluginChunk;

// Allocate and init parametric curves container.
void _cmsAllocCurvesPluginChunk(struct _cmsContext_struct* ctx,
                                                      const struct _cmsContext_struct* src);

// Container for formatters plug-in
typedef struct {

    struct _cms_formatters_factory_list* FactoryList;

} _cmsFormattersPluginChunkType;

// The global Context0 storage for formatters plug-in
extern  _cmsFormattersPluginChunkType _cmsFormattersPluginChunk;

// Allocate and init formatters container.
void _cmsAllocFormattersPluginChunk(struct _cmsContext_struct* ctx,
                                                       const struct _cmsContext_struct* src);

// This chunk type is shared by TagType plug-in and MPE Plug-in
typedef struct {

    struct _cmsTagTypeLinkedList_st* TagTypes;

} _cmsTagTypePluginChunkType;


// The global Context0 storage for tag types plug-in
extern  _cmsTagTypePluginChunkType      _cmsTagTypePluginChunk;


// The global Context0 storage for mult process elements plug-in
extern  _cmsTagTypePluginChunkType      _cmsMPETypePluginChunk;

// Allocate and init Tag types container.
void _cmsAllocTagTypePluginChunk(struct _cmsContext_struct* ctx,
                                                        const struct _cmsContext_struct* src);
// Allocate and init MPE container.
void _cmsAllocMPETypePluginChunk(struct _cmsContext_struct* ctx,
                                                        const struct _cmsContext_struct* src);
// Container for tag plug-in
typedef struct {

    struct _cmsTagLinkedList_st* Tag;

} _cmsTagPluginChunkType;


// The global Context0 storage for tag plug-in
extern  _cmsTagPluginChunkType _cmsTagPluginChunk;

// Allocate and init Tag container.
void _cmsAllocTagPluginChunk(struct _cmsContext_struct* ctx,
                                                      const struct _cmsContext_struct* src);

// Container for intents plug-in
typedef struct {

    struct _cms_intents_list* Intents;

} _cmsIntentsPluginChunkType;


// The global Context0 storage for intents plug-in
extern  _cmsIntentsPluginChunkType _cmsIntentsPluginChunk;

// Allocate and init intents container.
void _cmsAllocIntentsPluginChunk(struct _cmsContext_struct* ctx,
                                                        const struct _cmsContext_struct* src);

// Container for optimization plug-in
typedef struct {

    struct _cmsOptimizationCollection_st* OptimizationCollection;

} _cmsOptimizationPluginChunkType;


// The global Context0 storage for optimizers plug-in
extern  _cmsOptimizationPluginChunkType _cmsOptimizationPluginChunk;

// Allocate and init optimizers container.
void _cmsAllocOptimizationPluginChunk(struct _cmsContext_struct* ctx,
                                         const struct _cmsContext_struct* src);

// Container for transform plug-in
typedef struct {

    struct _cmsTransformCollection_st* TransformCollection;

} _cmsTransformPluginChunkType;

// The global Context0 storage for full-transform replacement plug-in
extern  _cmsTransformPluginChunkType _cmsTransformPluginChunk;

// Allocate and init transform container.
void _cmsAllocTransformPluginChunk(struct _cmsContext_struct* ctx,
                                        const struct _cmsContext_struct* src);

// Container for mutex plug-in
typedef struct {

    _cmsCreateMutexFnPtrType  CreateMutexPtr;
    _cmsDestroyMutexFnPtrType DestroyMutexPtr;
    _cmsLockMutexFnPtrType    LockMutexPtr;
    _cmsUnlockMutexFnPtrType  UnlockMutexPtr;

} _cmsMutexPluginChunkType;

// The global Context0 storage for mutex plug-in
extern  _cmsMutexPluginChunkType _cmsMutexPluginChunk;

// Allocate and init mutex container.
void _cmsAllocMutexPluginChunk(struct _cmsContext_struct* ctx,
                                        const struct _cmsContext_struct* src);

// ----------------------------------------------------------------------------------
// MLU internal representation
typedef struct {

    cmsUInt16Number Language;
    cmsUInt16Number Country;

    cmsUInt32Number StrW;       // Offset to current unicode string
    cmsUInt32Number Len;        // Length in bytes

} _cmsMLUentry;

struct _cms_MLU_struct {

    cmsContext ContextID;

    // The directory
    cmsUInt32Number  AllocatedEntries;
    cmsUInt32Number  UsedEntries;
    _cmsMLUentry* Entries;     // Array of pointers to strings allocated in MemPool

    // The Pool
    cmsUInt32Number PoolSize;  // The maximum allocated size
    cmsUInt32Number PoolUsed;  // The used size
    void*  MemPool;            // Pointer to begin of memory pool
};

// Named color list internal representation
typedef struct {

    char Name[cmsMAX_PATH];
    cmsUInt16Number PCS[3];
    cmsUInt16Number DeviceColorant[cmsMAXCHANNELS];

} _cmsNAMEDCOLOR;

struct _cms_NAMEDCOLORLIST_struct {

    cmsUInt32Number nColors;
    cmsUInt32Number Allocated;
    cmsUInt32Number ColorantCount;

    char Prefix[33];      // Prefix and suffix are defined to be 32 characters at most
    char Suffix[33];

    _cmsNAMEDCOLOR* List;

    cmsContext ContextID;
};


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

// This is the internal struct holding profile details.

// Maximum supported tags in a profile
#define MAX_TABLE_TAG       100

typedef struct _cms_iccprofile_struct {

    // I/O handler
    cmsIOHANDLER*            IOhandler;

    // The thread ID
    cmsContext               ContextID;

    // Creation time
    struct tm                Created;

    // Only most important items found in ICC profiles
    cmsUInt32Number          Version;
    cmsProfileClassSignature DeviceClass;
    cmsColorSpaceSignature   ColorSpace;
    cmsColorSpaceSignature   PCS;
    cmsUInt32Number          RenderingIntent;

    cmsUInt32Number          flags;
    cmsUInt32Number          manufacturer, model;
    cmsUInt64Number          attributes;
    cmsUInt32Number          creator;

    cmsProfileID             ProfileID;

    // Dictionary
    cmsUInt32Number          TagCount;
    cmsTagSignature          TagNames[MAX_TABLE_TAG];
    cmsTagSignature          TagLinked[MAX_TABLE_TAG];           // The tag to which is linked (0=none)
    cmsUInt32Number          TagSizes[MAX_TABLE_TAG];            // Size on disk
    cmsUInt32Number          TagOffsets[MAX_TABLE_TAG];
    cmsBool                  TagSaveAsRaw[MAX_TABLE_TAG];        // True to write uncooked
    void *                   TagPtrs[MAX_TABLE_TAG];
    cmsTagTypeHandler*       TagTypeHandlers[MAX_TABLE_TAG];     // Same structure may be serialized on different types
                                                                 // depending on profile version, so we keep track of the
                                                                 // type handler for each tag in the list.
    // Special
    cmsBool                  IsWrite;

    // Keep a mutex for cmsReadTag -- Note that this only works if the user includes a mutex plugin
    void *                   UsrMutex;

} _cmsICCPROFILE;

// IO helpers for profiles
cmsBool              _cmsReadHeader(_cmsICCPROFILE* Icc);
cmsBool              _cmsWriteHeader(_cmsICCPROFILE* Icc, cmsUInt32Number UsedSpace);
int                  _cmsSearchTag(_cmsICCPROFILE* Icc, cmsTagSignature sig, cmsBool lFollowLinks);

// Tag types
cmsTagTypeHandler*   _cmsGetTagTypeHandler(cmsContext ContextID, cmsTagTypeSignature sig);
cmsTagTypeSignature  _cmsGetTagTrueType(cmsHPROFILE hProfile, cmsTagSignature sig);
cmsTagDescriptor*    _cmsGetTagDescriptor(cmsContext ContextID, cmsTagSignature sig);

// Error logging ---------------------------------------------------------------------------------------------------------

void                 _cmsTagSignature2String(char String[5], cmsTagSignature sig);

// Interpolation ---------------------------------------------------------------------------------------------------------

cmsInterpParams*     _cmsComputeInterpParams(cmsContext ContextID, int nSamples, int InputChan, int OutputChan, const void* Table, cmsUInt32Number dwFlags);
cmsInterpParams*     _cmsComputeInterpParamsEx(cmsContext ContextID, const cmsUInt32Number nSamples[], int InputChan, int OutputChan, const void* Table, cmsUInt32Number dwFlags);
void                 _cmsFreeInterpParams(cmsInterpParams* p);
cmsBool              _cmsSetInterpolationRoutine(cmsContext ContextID, cmsInterpParams* p);

// Curves ----------------------------------------------------------------------------------------------------------------

// This struct holds information about a segment, plus a pointer to the function that implements the evaluation.
// In the case of table-based, Eval pointer is set to NULL

// The gamma function main structure
struct _cms_curve_struct {

    cmsInterpParams*  InterpParams;  // Private optimizations for interpolation

    cmsUInt32Number   nSegments;     // Number of segments in the curve. Zero for a 16-bit based tables
    cmsCurveSegment*  Segments;      // The segments
    cmsInterpParams** SegInterp;     // Array of private optimizations for interpolation in table-based segments

    cmsParametricCurveEvaluator* Evals;  // Evaluators (one per segment)

    // 16 bit Table-based representation follows
    cmsUInt32Number    nEntries;      // Number of table elements
    cmsUInt16Number*   Table16;       // The table itself.
};


//  Pipelines & Stages ---------------------------------------------------------------------------------------------

// A single stage
struct _cmsStage_struct {

    cmsContext          ContextID;

    cmsStageSignature   Type;           // Identifies the stage
    cmsStageSignature   Implements;     // Identifies the *function* of the stage (for optimizations)

    cmsUInt32Number     InputChannels;  // Input channels -- for optimization purposes
    cmsUInt32Number     OutputChannels; // Output channels -- for optimization purposes

    _cmsStageEvalFn     EvalPtr;        // Points to fn that evaluates the stage (always in floating point)
    _cmsStageDupElemFn  DupElemPtr;     // Points to a fn that duplicates the *data* of the stage
    _cmsStageFreeElemFn FreePtr;        // Points to a fn that sets the *data* of the stage free

    // A generic pointer to whatever memory needed by the stage
    void*               Data;

    // Maintains linked list (used internally)
    struct _cmsStage_struct* Next;
};


// Special Stages (cannot be saved)
cmsStage*        _cmsStageAllocLab2XYZ(cmsContext ContextID);
cmsStage*        _cmsStageAllocXYZ2Lab(cmsContext ContextID);
cmsStage*        _cmsStageAllocLabPrelin(cmsContext ContextID);
cmsStage*        _cmsStageAllocLabV2ToV4(cmsContext ContextID);
cmsStage*        _cmsStageAllocLabV2ToV4curves(cmsContext ContextID);
cmsStage*        _cmsStageAllocLabV4ToV2(cmsContext ContextID);
cmsStage*        _cmsStageAllocNamedColor(cmsNAMEDCOLORLIST* NamedColorList, cmsBool UsePCS);
cmsStage*        _cmsStageAllocIdentityCurves(cmsContext ContextID, int nChannels);
cmsStage*        _cmsStageAllocIdentityCLut(cmsContext ContextID, int nChan);
cmsStage*        _cmsStageNormalizeFromLabFloat(cmsContext ContextID);
cmsStage*        _cmsStageNormalizeFromXyzFloat(cmsContext ContextID);
cmsStage*        _cmsStageNormalizeToLabFloat(cmsContext ContextID);
cmsStage*        _cmsStageNormalizeToXyzFloat(cmsContext ContextID);
cmsStage*        _cmsStageClipNegatives(cmsContext ContextID, int nChannels);


// For curve set only
cmsToneCurve**     _cmsStageGetPtrToCurveSet(const cmsStage* mpe);


// Pipeline Evaluator (in floating point)
typedef void (* _cmsPipelineEvalFloatFn)(const cmsFloat32Number In[],
                                         cmsFloat32Number Out[],
                                         const void* Data);

struct _cmsPipeline_struct {

    cmsStage* Elements;                                // Points to elements chain
    cmsUInt32Number InputChannels, OutputChannels;

    // Data & evaluators
    void *Data;

   _cmsOPTeval16Fn         Eval16Fn;
   _cmsPipelineEvalFloatFn EvalFloatFn;
   _cmsFreeUserDataFn      FreeDataFn;
   _cmsDupUserDataFn       DupDataFn;

    cmsContext ContextID;            // Environment

    cmsBool  SaveAs8Bits;            // Implementation-specific: save as 8 bits if possible
};

// LUT reading & creation -------------------------------------------------------------------------------------------

// Read tags using low-level function, provide necessary glue code to adapt versions, etc. All those return a brand new copy
// of the LUTS, since ownership of original is up to the profile. The user should free allocated resources.

cmsPipeline*      _cmsReadInputLUT(cmsHPROFILE hProfile, int Intent);
cmsPipeline*      _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent);
cmsPipeline*      _cmsReadDevicelinkLUT(cmsHPROFILE hProfile, int Intent);

// Special values
cmsBool           _cmsReadMediaWhitePoint(cmsCIEXYZ* Dest, cmsHPROFILE hProfile);
cmsBool           _cmsReadCHAD(cmsMAT3* Dest, cmsHPROFILE hProfile);

// Profile linker --------------------------------------------------------------------------------------------------

cmsPipeline* _cmsLinkProfiles(cmsContext         ContextID,
                              cmsUInt32Number    nProfiles,
                              cmsUInt32Number    TheIntents[],
                              cmsHPROFILE        hProfiles[],
                              cmsBool            BPC[],
                              cmsFloat64Number   AdaptationStates[],
                              cmsUInt32Number    dwFlags);

// Sequence --------------------------------------------------------------------------------------------------------

cmsSEQ* _cmsReadProfileSequence(cmsHPROFILE hProfile);
cmsBool _cmsWriteProfileSequence(cmsHPROFILE hProfile, const cmsSEQ* seq);
cmsSEQ* _cmsCompileProfileSequence(cmsContext ContextID, cmsUInt32Number nProfiles, cmsHPROFILE hProfiles[]);


// LUT optimization ------------------------------------------------------------------------------------------------

cmsUInt16Number  _cmsQuantizeVal(cmsFloat64Number i, int MaxSamples);
int              _cmsReasonableGridpointsByColorspace(cmsColorSpaceSignature Colorspace, cmsUInt32Number dwFlags);

cmsBool          _cmsEndPointsBySpace(cmsColorSpaceSignature Space,
                                      cmsUInt16Number **White,
                                      cmsUInt16Number **Black,
                                      cmsUInt32Number *nOutputs);

cmsBool          _cmsOptimizePipeline(cmsContext ContextID,
                                      cmsPipeline**    Lut,
                                      int              Intent,
                                      cmsUInt32Number* InputFormat,
                                      cmsUInt32Number* OutputFormat,
                                      cmsUInt32Number* dwFlags );


// Hi level LUT building ----------------------------------------------------------------------------------------------

cmsPipeline*     _cmsCreateGamutCheckPipeline(cmsContext ContextID,
                                              cmsHPROFILE hProfiles[],
                                              cmsBool  BPC[],
                                              cmsUInt32Number Intents[],
                                              cmsFloat64Number AdaptationStates[],
                                              cmsUInt32Number nGamutPCSposition,
                                              cmsHPROFILE hGamut);


// Formatters ------------------------------------------------------------------------------------------------------------

#define cmsFLAGS_CAN_CHANGE_FORMATTER     0x02000000   // Allow change buffer format

cmsBool         _cmsFormatterIsFloat(cmsUInt32Number Type);
cmsBool         _cmsFormatterIs8bit(cmsUInt32Number Type);

cmsFormatter    _cmsGetFormatter(cmsContext ContextID,
                                 cmsUInt32Number Type,          // Specific type, i.e. TYPE_RGB_8
                                 cmsFormatterDirection Dir,
                                 cmsUInt32Number dwFlags);


#ifndef CMS_NO_HALF_SUPPORT

// Half float
cmsFloat32Number _cmsHalf2Float(cmsUInt16Number h);
cmsUInt16Number  _cmsFloat2Half(cmsFloat32Number flt);

#endif

// Transform logic ------------------------------------------------------------------------------------------------------

struct _cmstransform_struct;

typedef struct {

    // 1-pixel cache (16 bits only)
    cmsUInt16Number CacheIn[cmsMAXCHANNELS];
    cmsUInt16Number CacheOut[cmsMAXCHANNELS];

} _cmsCACHE;


// Transformation
typedef struct _cmstransform_struct {

    cmsUInt32Number InputFormat, OutputFormat; // Keep formats for further reference

    // Points to transform code
    _cmsTransform2Fn xform;

    // Formatters, cannot be embedded into LUT because cache
    cmsFormatter16 FromInput;
    cmsFormatter16 ToOutput;

    cmsFormatterFloat FromInputFloat;
    cmsFormatterFloat ToOutputFloat;

    // 1-pixel cache seed for zero as input (16 bits, read only)
    _cmsCACHE Cache;

    // A Pipeline holding the full (optimized) transform
    cmsPipeline* Lut;

    // A Pipeline holding the gamut check. It goes from the input space to bilevel
    cmsPipeline* GamutCheck;

    // Colorant tables
    cmsNAMEDCOLORLIST* InputColorant;       // Input Colorant table
    cmsNAMEDCOLORLIST* OutputColorant;      // Colorant table (for n chans > CMYK)

    // Informational only
    cmsColorSpaceSignature EntryColorSpace;
    cmsColorSpaceSignature ExitColorSpace;

    // White points (informative only)
    cmsCIEXYZ EntryWhitePoint;
    cmsCIEXYZ ExitWhitePoint;

    // Profiles used to create the transform
    cmsSEQ* Sequence;

    cmsUInt32Number  dwOriginalFlags;
    cmsFloat64Number AdaptationState;

    // The intent of this transform. That is usually the last intent in the profilechain, but may differ
    cmsUInt32Number RenderingIntent;

    // An id that uniquely identifies the running context. May be null.
    cmsContext ContextID;

    // A user-defined pointer that can be used to store data for transform plug-ins
    void* UserData;
    _cmsFreeUserDataFn FreeUserData;

    // A way to provide backwards compatibility with full xform plugins
    _cmsTransformFn OldXform;

} _cmsTRANSFORM;

// Copies extra channels from input to output if the original flags in the transform structure
// instructs to do so. This function is called on all standard transform functions.
void _cmsHandleExtraChannels(_cmsTRANSFORM* p, const void* in,
                             void* out,
                             cmsUInt32Number PixelsPerLine,
                             cmsUInt32Number LineCount,
                             const cmsStride* Stride);

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

cmsHTRANSFORM _cmsChain2Lab(cmsContext             ContextID,
                            cmsUInt32Number        nProfiles,
                            cmsUInt32Number        InputFormat,
                            cmsUInt32Number        OutputFormat,
                            const cmsUInt32Number  Intents[],
                            const cmsHPROFILE      hProfiles[],
                            const cmsBool          BPC[],
                            const cmsFloat64Number AdaptationStates[],
                            cmsUInt32Number        dwFlags);


cmsToneCurve* _cmsBuildKToneCurve(cmsContext       ContextID,
                            cmsUInt32Number        nPoints,
                            cmsUInt32Number        nProfiles,
                            const cmsUInt32Number  Intents[],
                            const cmsHPROFILE      hProfiles[],
                            const cmsBool          BPC[],
                            const cmsFloat64Number AdaptationStates[],
                            cmsUInt32Number        dwFlags);

cmsBool   _cmsAdaptationMatrix(cmsMAT3* r, const cmsMAT3* ConeMatrix, const cmsCIEXYZ* FromIll, const cmsCIEXYZ* ToIll);

cmsBool   _cmsBuildRGB2XYZtransferMatrix(cmsMAT3* r, const cmsCIExyY* WhitePoint, const cmsCIExyYTRIPLE* Primaries);


#define _lcms_internal_H
#endif