//--------------------------------------------------------------------------------- // // Little Color Management System // Copyright (c) 1998-2011 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. // //--------------------------------------------------------------------------------- // #include "lcms2_internal.h" //---------------------------------------------------------------------------------- // Optimization for 8 bits, Shaper-CLUT (3 inputs only) typedef struct { cmsContext ContextID; const cmsInterpParams* p; // Tetrahedrical interpolation parameters. This is a not-owned pointer. cmsUInt16Number rx[256], ry[256], rz[256]; cmsUInt32Number X0[256], Y0[256], Z0[256]; // Precomputed nodes and offsets for 8-bit input data } Prelin8Data; // Generic optimization for 16 bits Shaper-CLUT-Shaper (any inputs) typedef struct { cmsContext ContextID; // Number of channels int nInputs; int nOutputs; // Since there is no limitation of the output number of channels, this buffer holding the connexion CLUT-shaper // has to be dynamically allocated. This is not the case of first step shaper-CLUT, which is limited to max inputs cmsUInt16Number* StageDEF; _cmsInterpFn16 EvalCurveIn16[MAX_INPUT_DIMENSIONS]; // The maximum number of input channels is known in advance cmsInterpParams* ParamsCurveIn16[MAX_INPUT_DIMENSIONS]; _cmsInterpFn16 EvalCLUT; // The evaluator for 3D grid const cmsInterpParams* CLUTparams; // (not-owned pointer) _cmsInterpFn16* EvalCurveOut16; // Points to an array of curve evaluators in 16 bits (not-owned pointer) cmsInterpParams** ParamsCurveOut16; // Points to an array of references to interpolation params (not-owned pointer) } Prelin16Data; // Optimization for matrix-shaper in 8 bits. Numbers are operated in n.14 signed, tables are stored in 1.14 fixed typedef cmsInt32Number cmsS1Fixed14Number; // Note that this may hold more than 16 bits! #define DOUBLE_TO_1FIXED14(x) ((cmsS1Fixed14Number) floor((x) * 16384.0 + 0.5)) typedef struct { cmsContext ContextID; cmsS1Fixed14Number Shaper1R[256]; // from 0..255 to 1.14 (0.0...1.0) cmsS1Fixed14Number Shaper1G[256]; cmsS1Fixed14Number Shaper1B[256]; cmsS1Fixed14Number Mat[3][3]; // n.14 to n.14 (needs a saturation after that) cmsS1Fixed14Number Off[3]; cmsUInt16Number Shaper2R[16385]; // 1.14 to 0..255 cmsUInt16Number Shaper2G[16385]; cmsUInt16Number Shaper2B[16385]; } MatShaper8Data; // Curves, optimization is shared between 8 and 16 bits typedef struct { cmsContext ContextID; int nCurves; // Number of curves int nElements; // Elements in curves cmsUInt16Number** Curves; // Points to a dynamically allocated array } Curves16Data; // Simple optimizations ---------------------------------------------------------------------------------------------------------- // Remove an element in linked chain static void _RemoveElement(cmsStage** head) { cmsStage* mpe = *head; cmsStage* next = mpe ->Next; *head = next; cmsStageFree(mpe); } // Remove all identities in chain. Note that pt actually is a double pointer to the element that holds the pointer. static cmsBool _Remove1Op(cmsPipeline* Lut, cmsStageSignature UnaryOp) { cmsStage** pt = &Lut ->Elements; cmsBool AnyOpt = FALSE; while (*pt != NULL) { if ((*pt) ->Implements == UnaryOp) { _RemoveElement(pt); AnyOpt = TRUE; } else pt = &((*pt) -> Next); } return AnyOpt; } // Same, but only if two adjacent elements are found static cmsBool _Remove2Op(cmsPipeline* Lut, cmsStageSignature Op1, cmsStageSignature Op2) { cmsStage** pt1; cmsStage** pt2; cmsBool AnyOpt = FALSE; pt1 = &Lut ->Elements; if (*pt1 == NULL) return AnyOpt; while (*pt1 != NULL) { pt2 = &((*pt1) -> Next); if (*pt2 == NULL) return AnyOpt; if ((*pt1) ->Implements == Op1 && (*pt2) ->Implements == Op2) { _RemoveElement(pt2); _RemoveElement(pt1); AnyOpt = TRUE; } else pt1 = &((*pt1) -> Next); } return AnyOpt; } // Preoptimize just gets rif of no-ops coming paired. Conversion from v2 to v4 followed // by a v4 to v2 and vice-versa. The elements are then discarded. static cmsBool PreOptimize(cmsPipeline* Lut) { cmsBool AnyOpt = FALSE, Opt; AnyOpt = FALSE; do { Opt = FALSE; // Remove all identities Opt |= _Remove1Op(Lut, cmsSigIdentityElemType); // Remove XYZ2Lab followed by Lab2XYZ Opt |= _Remove2Op(Lut, cmsSigXYZ2LabElemType, cmsSigLab2XYZElemType); // Remove Lab2XYZ followed by XYZ2Lab Opt |= _Remove2Op(Lut, cmsSigLab2XYZElemType, cmsSigXYZ2LabElemType); // Remove V4 to V2 followed by V2 to V4 Opt |= _Remove2Op(Lut, cmsSigLabV4toV2, cmsSigLabV2toV4); // Remove V2 to V4 followed by V4 to V2 Opt |= _Remove2Op(Lut, cmsSigLabV2toV4, cmsSigLabV4toV2); if (Opt) AnyOpt = TRUE; } while (Opt); return AnyOpt; } static void Eval16nop1D(register const cmsUInt16Number Input[], register cmsUInt16Number Output[], register const struct _cms_interp_struc* p) { Output[0] = Input[0]; cmsUNUSED_PARAMETER(p); } static void PrelinEval16(register const cmsUInt16Number Input[], register cmsUInt16Number Output[], register const void* D) { Prelin16Data* p16 = (Prelin16Data*) D; cmsUInt16Number StageABC[MAX_INPUT_DIMENSIONS]; int i; for (i=0; i < p16 ->nInputs; i++) { p16 ->EvalCurveIn16[i](&Input[i], &StageABC[i], p16 ->ParamsCurveIn16[i]); } p16 ->EvalCLUT(StageABC, p16 ->StageDEF, p16 ->CLUTparams); for (i=0; i < p16 ->nOutputs; i++) { p16 ->EvalCurveOut16[i](&p16->StageDEF[i], &Output[i], p16 ->ParamsCurveOut16[i]); } } static void PrelinOpt16free(cmsContext ContextID, void* ptr) { Prelin16Data* p16 = (Prelin16Data*) ptr; _cmsFree(ContextID, p16 ->StageDEF); _cmsFree(ContextID, p16 ->EvalCurveOut16); _cmsFree(ContextID, p16 ->ParamsCurveOut16); _cmsFree(ContextID, p16); } static void* Prelin16dup(cmsContext ContextID, const void* ptr) { Prelin16Data* p16 = (Prelin16Data*) ptr; Prelin16Data* Duped = _cmsDupMem(ContextID, p16, sizeof(Prelin16Data)); if (Duped == NULL) return NULL; Duped ->StageDEF = _cmsCalloc(ContextID, p16 ->nOutputs, sizeof(cmsUInt16Number)); Duped ->EvalCurveOut16 = _cmsDupMem(ContextID, p16 ->EvalCurveOut16, p16 ->nOutputs * sizeof(_cmsInterpFn16)); Duped ->ParamsCurveOut16 = _cmsDupMem(ContextID, p16 ->ParamsCurveOut16, p16 ->nOutputs * sizeof(cmsInterpParams* )); return Duped; } static Prelin16Data* PrelinOpt16alloc(cmsContext ContextID, const cmsInterpParams* ColorMap, int nInputs, cmsToneCurve** In, int nOutputs, cmsToneCurve** Out ) { int i; Prelin16Data* p16 = (Prelin16Data*) _cmsMallocZero(ContextID, sizeof(Prelin16Data)); if (p16 == NULL) return NULL; p16 ->nInputs = nInputs; p16 -> nOutputs = nOutputs; for (i=0; i < nInputs; i++) { if (In == NULL) { p16 -> ParamsCurveIn16[i] = NULL; p16 -> EvalCurveIn16[i] = Eval16nop1D; } else { p16 -> ParamsCurveIn16[i] = In[i] ->InterpParams; p16 -> EvalCurveIn16[i] = p16 ->ParamsCurveIn16[i]->Interpolation.Lerp16; } } p16 ->CLUTparams = ColorMap; p16 ->EvalCLUT = ColorMap ->Interpolation.Lerp16; p16 -> StageDEF = _cmsCalloc(ContextID, p16 ->nOutputs, sizeof(cmsUInt16Number)); p16 -> EvalCurveOut16 = (_cmsInterpFn16*) _cmsCalloc(ContextID, nOutputs, sizeof(_cmsInterpFn16)); p16 -> ParamsCurveOut16 = (cmsInterpParams**) _cmsCalloc(ContextID, nOutputs, sizeof(cmsInterpParams* )); for (i=0; i < nOutputs; i++) { if (Out == NULL) { p16 ->ParamsCurveOut16[i] = NULL; p16 -> EvalCurveOut16[i] = Eval16nop1D; } else { p16 ->ParamsCurveOut16[i] = Out[i] ->InterpParams; p16 -> EvalCurveOut16[i] = p16 ->ParamsCurveOut16[i]->Interpolation.Lerp16; } } return p16; } // Resampling --------------------------------------------------------------------------------- #define PRELINEARIZATION_POINTS 4096 // Sampler implemented by another LUT. This is a clean way to precalculate the devicelink 3D CLUT for // almost any transform. We use floating point precision and then convert from floating point to 16 bits. static int XFormSampler16(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void* Cargo) { cmsPipeline* Lut = (cmsPipeline*) Cargo; cmsFloat32Number InFloat[cmsMAXCHANNELS], OutFloat[cmsMAXCHANNELS]; cmsUInt32Number i; _cmsAssert(Lut -> InputChannels < cmsMAXCHANNELS); _cmsAssert(Lut -> OutputChannels < cmsMAXCHANNELS); // From 16 bit to floating point for (i=0; i < Lut ->InputChannels; i++) InFloat[i] = (cmsFloat32Number) (In[i] / 65535.0); // Evaluate in floating point cmsPipelineEvalFloat(InFloat, OutFloat, Lut); // Back to 16 bits representation for (i=0; i < Lut ->OutputChannels; i++) Out[i] = _cmsQuickSaturateWord(OutFloat[i] * 65535.0); // Always succeed return TRUE; } // Try to see if the curves of a given MPE are linear static cmsBool AllCurvesAreLinear(cmsStage* mpe) { cmsToneCurve** Curves; cmsUInt32Number i, n; Curves = _cmsStageGetPtrToCurveSet(mpe); if (Curves == NULL) return FALSE; n = cmsStageOutputChannels(mpe); for (i=0; i < n; i++) { if (!cmsIsToneCurveLinear(Curves[i])) return FALSE; } return TRUE; } // This function replaces a specific node placed in "At" by the "Value" numbers. Its purpose // is to fix scum dot on broken profiles/transforms. Works on 1, 3 and 4 channels static cmsBool PatchLUT(cmsStage* CLUT, cmsUInt16Number At[], cmsUInt16Number Value[], int nChannelsOut, int nChannelsIn) { _cmsStageCLutData* Grid = (_cmsStageCLutData*) CLUT ->Data; cmsInterpParams* p16 = Grid ->Params; cmsFloat64Number px, py, pz, pw; int x0, y0, z0, w0; int i, index; if (CLUT -> Type != cmsSigCLutElemType) { cmsSignalError(CLUT->ContextID, cmsERROR_INTERNAL, "(internal) Attempt to PatchLUT on non-lut MPE"); return FALSE; } px = ((cmsFloat64Number) At[0] * (p16->Domain[0])) / 65535.0; py = ((cmsFloat64Number) At[1] * (p16->Domain[1])) / 65535.0; pz = ((cmsFloat64Number) At[2] * (p16->Domain[2])) / 65535.0; pw = ((cmsFloat64Number) At[3] * (p16->Domain[3])) / 65535.0; x0 = (int) floor(px); y0 = (int) floor(py); z0 = (int) floor(pz); w0 = (int) floor(pw); if (nChannelsIn == 4) { if (((px - x0) != 0) || ((py - y0) != 0) || ((pz - z0) != 0) || ((pw - w0) != 0)) return FALSE; // Not on exact node index = p16 -> opta[3] * x0 + p16 -> opta[2] * y0 + p16 -> opta[1] * z0 + p16 -> opta[0] * w0; } else if (nChannelsIn == 3) { if (((px - x0) != 0) || ((py - y0) != 0) || ((pz - z0) != 0)) return FALSE; // Not on exact node index = p16 -> opta[2] * x0 + p16 -> opta[1] * y0 + p16 -> opta[0] * z0; } else if (nChannelsIn == 1) { if (((px - x0) != 0)) return FALSE; // Not on exact node index = p16 -> opta[0] * x0; } else { cmsSignalError(CLUT->ContextID, cmsERROR_INTERNAL, "(internal) %d Channels are not supported on PatchLUT", nChannelsIn); return FALSE; } for (i=0; i < nChannelsOut; i++) Grid -> Tab.T[index + i] = Value[i]; return TRUE; } // Auxiliar, to see if two values are equal. static cmsBool WhitesAreEqual(int n, cmsUInt16Number White1[], cmsUInt16Number White2[] ) { int i; for (i=0; i < n; i++) { if (White1[i] != White2[i]) return FALSE; } return TRUE; } // Locate the node for the white point and fix it to pure white in order to avoid scum dot. static cmsBool FixWhiteMisalignment(cmsPipeline* Lut, cmsColorSpaceSignature EntryColorSpace, cmsColorSpaceSignature ExitColorSpace) { cmsUInt16Number *WhitePointIn, *WhitePointOut; cmsUInt16Number WhiteIn[cmsMAXCHANNELS], WhiteOut[cmsMAXCHANNELS], ObtainedOut[cmsMAXCHANNELS]; cmsUInt32Number i, nOuts, nIns; cmsStage *PreLin = NULL, *CLUT = NULL, *PostLin = NULL; if (!_cmsEndPointsBySpace(EntryColorSpace, &WhitePointIn, NULL, &nIns)) return FALSE; if (!_cmsEndPointsBySpace(ExitColorSpace, &WhitePointOut, NULL, &nOuts)) return FALSE; // It needs to be fixed? cmsPipelineEval16(WhitePointIn, ObtainedOut, Lut); if (WhitesAreEqual(nOuts, WhitePointOut, ObtainedOut)) return TRUE; // whites already match // Check if the LUT comes as Prelin, CLUT or Postlin. We allow all combinations if (!cmsPipelineCheckAndRetreiveStages(Lut, 3, cmsSigCurveSetElemType, cmsSigCLutElemType, cmsSigCurveSetElemType, &PreLin, &CLUT, &PostLin)) if (!cmsPipelineCheckAndRetreiveStages(Lut, 2, cmsSigCurveSetElemType, cmsSigCLutElemType, &PreLin, &CLUT)) if (!cmsPipelineCheckAndRetreiveStages(Lut, 2, cmsSigCLutElemType, cmsSigCurveSetElemType, &CLUT, &PostLin)) if (!cmsPipelineCheckAndRetreiveStages(Lut, 1, cmsSigCLutElemType, &CLUT)) return FALSE; // We need to interpolate white points of both, pre and post curves if (PreLin) { cmsToneCurve** Curves = _cmsStageGetPtrToCurveSet(PreLin); for (i=0; i < nIns; i++) { WhiteIn[i] = cmsEvalToneCurve16(Curves[i], WhitePointIn[i]); } } else { for (i=0; i < nIns; i++) WhiteIn[i] = WhitePointIn[i]; } // If any post-linearization, we need to find how is represented white before the curve, do // a reverse interpolation in this case. if (PostLin) { cmsToneCurve** Curves = _cmsStageGetPtrToCurveSet(PostLin); for (i=0; i < nOuts; i++) { cmsToneCurve* InversePostLin = cmsReverseToneCurve(Curves[i]); WhiteOut[i] = cmsEvalToneCurve16(InversePostLin, WhitePointOut[i]); cmsFreeToneCurve(InversePostLin); } } else { for (i=0; i < nOuts; i++) WhiteOut[i] = WhitePointOut[i]; } // Ok, proceed with patching. May fail and we don't care if it fails PatchLUT(CLUT, WhiteIn, WhiteOut, nOuts, nIns); return TRUE; } // ----------------------------------------------------------------------------------------------------------------------------------------------- // This function creates simple LUT from complex ones. The generated LUT has an optional set of // prelinearization curves, a CLUT of nGridPoints and optional postlinearization tables. // These curves have to exist in the original LUT in order to be used in the simplified output. // Caller may also use the flags to allow this feature. // LUTS with all curves will be simplified to a single curve. Parametric curves are lost. // This function should be used on 16-bits LUTS only, as floating point losses precision when simplified // ----------------------------------------------------------------------------------------------------------------------------------------------- static cmsBool OptimizeByResampling(cmsPipeline** Lut, cmsUInt32Number Intent, cmsUInt32Number* InputFormat, cmsUInt32Number* OutputFormat, cmsUInt32Number* dwFlags) { cmsPipeline* Src; cmsPipeline* Dest; cmsStage* CLUT; cmsStage *KeepPreLin = NULL, *KeepPostLin = NULL; int nGridPoints; cmsColorSpaceSignature ColorSpace, OutputColorSpace; cmsStage *NewPreLin = NULL; cmsStage *NewPostLin = NULL; _cmsStageCLutData* DataCLUT; cmsToneCurve** DataSetIn; cmsToneCurve** DataSetOut; Prelin16Data* p16; // This is a loosy optimization! does not apply in floating-point cases if (_cmsFormatterIsFloat(*InputFormat) || _cmsFormatterIsFloat(*OutputFormat)) return FALSE; ColorSpace = _cmsICCcolorSpace(T_COLORSPACE(*InputFormat)); OutputColorSpace = _cmsICCcolorSpace(T_COLORSPACE(*OutputFormat)); nGridPoints = _cmsReasonableGridpointsByColorspace(ColorSpace, *dwFlags); // For empty LUTs, 2 points are enough if (cmsPipelineStageCount(*Lut) == 0) nGridPoints = 2; Src = *Lut; // Allocate an empty LUT Dest = cmsPipelineAlloc(Src ->ContextID, Src ->InputChannels, Src ->OutputChannels); if (!Dest) return FALSE; // Prelinearization tables are kept unless indicated by flags if (*dwFlags & cmsFLAGS_CLUT_PRE_LINEARIZATION) { // Get a pointer to the prelinearization element cmsStage* PreLin = cmsPipelineGetPtrToFirstStage(Src); // Check if suitable if (PreLin ->Type == cmsSigCurveSetElemType) { // Maybe this is a linear tram, so we can avoid the whole stuff if (!AllCurvesAreLinear(PreLin)) { // All seems ok, proceed. NewPreLin = cmsStageDup(PreLin); cmsPipelineInsertStage(Dest, cmsAT_BEGIN, NewPreLin); // Remove prelinearization. Since we have duplicated the curve // in destination LUT, the sampling shoud be applied after this stage. cmsPipelineUnlinkStage(Src, cmsAT_BEGIN, &KeepPreLin); } } } // Allocate the CLUT CLUT = cmsStageAllocCLut16bit(Src ->ContextID, nGridPoints, Src ->InputChannels, Src->OutputChannels, NULL); if (CLUT == NULL) return FALSE; // Add the CLUT to the destination LUT cmsPipelineInsertStage(Dest, cmsAT_END, CLUT); // Postlinearization tables are kept unless indicated by flags if (*dwFlags & cmsFLAGS_CLUT_POST_LINEARIZATION) { // Get a pointer to the postlinearization if present cmsStage* PostLin = cmsPipelineGetPtrToLastStage(Src); // Check if suitable if (cmsStageType(PostLin) == cmsSigCurveSetElemType) { // Maybe this is a linear tram, so we can avoid the whole stuff if (!AllCurvesAreLinear(PostLin)) { // All seems ok, proceed. NewPostLin = cmsStageDup(PostLin); cmsPipelineInsertStage(Dest, cmsAT_END, NewPostLin); // In destination LUT, the sampling shoud be applied after this stage. cmsPipelineUnlinkStage(Src, cmsAT_END, &KeepPostLin); } } } // Now its time to do the sampling. We have to ignore pre/post linearization // The source LUT whithout pre/post curves is passed as parameter. if (!cmsStageSampleCLut16bit(CLUT, XFormSampler16, (void*) Src, 0)) { // Ops, something went wrong, Restore stages if (KeepPreLin != NULL) cmsPipelineInsertStage(Src, cmsAT_BEGIN, KeepPreLin); if (KeepPostLin != NULL) cmsPipelineInsertStage(Src, cmsAT_END, KeepPostLin); cmsPipelineFree(Dest); return FALSE; } // Done. if (KeepPreLin != NULL) cmsStageFree(KeepPreLin); if (KeepPostLin != NULL) cmsStageFree(KeepPostLin); cmsPipelineFree(Src); DataCLUT = (_cmsStageCLutData*) CLUT ->Data; if (NewPreLin == NULL) DataSetIn = NULL; else DataSetIn = ((_cmsStageToneCurvesData*) NewPreLin ->Data) ->TheCurves; if (NewPostLin == NULL) DataSetOut = NULL; else DataSetOut = ((_cmsStageToneCurvesData*) NewPostLin ->Data) ->TheCurves; if (DataSetIn == NULL && DataSetOut == NULL) { _cmsPipelineSetOptimizationParameters(Dest, (_cmsOPTeval16Fn) DataCLUT->Params->Interpolation.Lerp16, DataCLUT->Params, NULL, NULL); } else { p16 = PrelinOpt16alloc(Dest ->ContextID, DataCLUT ->Params, Dest ->InputChannels, DataSetIn, Dest ->OutputChannels, DataSetOut); _cmsPipelineSetOptimizationParameters(Dest, PrelinEval16, (void*) p16, PrelinOpt16free, Prelin16dup); } // Don't fix white on absolute colorimetric if (Intent == INTENT_ABSOLUTE_COLORIMETRIC) *dwFlags |= cmsFLAGS_NOWHITEONWHITEFIXUP; if (!(*dwFlags & cmsFLAGS_NOWHITEONWHITEFIXUP)) { FixWhiteMisalignment(Dest, ColorSpace, OutputColorSpace); } *Lut = Dest; return TRUE; cmsUNUSED_PARAMETER(Intent); } // ----------------------------------------------------------------------------------------------------------------------------------------------- // Fixes the gamma balancing of transform. This is described in my paper "Prelinearization Stages on // Color-Management Application-Specific Integrated Circuits (ASICs)" presented at NIP24. It only works // for RGB transforms. See the paper for more details // ----------------------------------------------------------------------------------------------------------------------------------------------- // Normalize endpoints by slope limiting max and min. This assures endpoints as well. // Descending curves are handled as well. static void SlopeLimiting(cmsToneCurve* g) { int BeginVal, EndVal; int AtBegin = (int) floor((cmsFloat64Number) g ->nEntries * 0.02 + 0.5); // Cutoff at 2% int AtEnd = g ->nEntries - AtBegin - 1; // And 98% cmsFloat64Number Val, Slope, beta; int i; if (cmsIsToneCurveDescending(g)) { BeginVal = 0xffff; EndVal = 0; } else { BeginVal = 0; EndVal = 0xffff; } // Compute slope and offset for begin of curve Val = g ->Table16[AtBegin]; Slope = (Val - BeginVal) / AtBegin; beta = Val - Slope * AtBegin; for (i=0; i < AtBegin; i++) g ->Table16[i] = _cmsQuickSaturateWord(i * Slope + beta); // Compute slope and offset for the end Val = g ->Table16[AtEnd]; Slope = (EndVal - Val) / AtBegin; // AtBegin holds the X interval, which is same in both cases beta = Val - Slope * AtEnd; for (i = AtEnd; i < (int) g ->nEntries; i++) g ->Table16[i] = _cmsQuickSaturateWord(i * Slope + beta); } // Precomputes tables for 8-bit on input devicelink. static Prelin8Data* PrelinOpt8alloc(cmsContext ContextID, const cmsInterpParams* p, cmsToneCurve* G[3]) { int i; cmsUInt16Number Input[3]; cmsS15Fixed16Number v1, v2, v3; Prelin8Data* p8; p8 = _cmsMallocZero(ContextID, sizeof(Prelin8Data)); if (p8 == NULL) return NULL; // Since this only works for 8 bit input, values comes always as x * 257, // we can safely take msb byte (x << 8 + x) for (i=0; i < 256; i++) { if (G != NULL) { // Get 16-bit representation Input[0] = cmsEvalToneCurve16(G[0], FROM_8_TO_16(i)); Input[1] = cmsEvalToneCurve16(G[1], FROM_8_TO_16(i)); Input[2] = cmsEvalToneCurve16(G[2], FROM_8_TO_16(i)); } else { Input[0] = FROM_8_TO_16(i); Input[1] = FROM_8_TO_16(i); Input[2] = FROM_8_TO_16(i); } // Move to 0..1.0 in fixed domain v1 = _cmsToFixedDomain(Input[0] * p -> Domain[0]); v2 = _cmsToFixedDomain(Input[1] * p -> Domain[1]); v3 = _cmsToFixedDomain(Input[2] * p -> Domain[2]); // Store the precalculated table of nodes p8 ->X0[i] = (p->opta[2] * FIXED_TO_INT(v1)); p8 ->Y0[i] = (p->opta[1] * FIXED_TO_INT(v2)); p8 ->Z0[i] = (p->opta[0] * FIXED_TO_INT(v3)); // Store the precalculated table of offsets p8 ->rx[i] = (cmsUInt16Number) FIXED_REST_TO_INT(v1); p8 ->ry[i] = (cmsUInt16Number) FIXED_REST_TO_INT(v2); p8 ->rz[i] = (cmsUInt16Number) FIXED_REST_TO_INT(v3); } p8 ->ContextID = ContextID; p8 ->p = p; return p8; } static void Prelin8free(cmsContext ContextID, void* ptr) { _cmsFree(ContextID, ptr); } static void* Prelin8dup(cmsContext ContextID, const void* ptr) { return _cmsDupMem(ContextID, ptr, sizeof(Prelin8Data)); } // A optimized interpolation for 8-bit input. #define DENS(i,j,k) (LutTable[(i)+(j)+(k)+OutChan]) static void PrelinEval8(register const cmsUInt16Number Input[], register cmsUInt16Number Output[], register const void* D) { cmsUInt8Number r, g, b; cmsS15Fixed16Number rx, ry, rz; cmsS15Fixed16Number c0, c1, c2, c3, Rest; int OutChan; register cmsS15Fixed16Number X0, X1, Y0, Y1, Z0, Z1; Prelin8Data* p8 = (Prelin8Data*) D; register const cmsInterpParams* p = p8 ->p; int TotalOut = p -> nOutputs; const cmsUInt16Number* LutTable = p -> Table; r = Input[0] >> 8; g = Input[1] >> 8; b = Input[2] >> 8; X0 = X1 = p8->X0[r]; Y0 = Y1 = p8->Y0[g]; Z0 = Z1 = p8->Z0[b]; rx = p8 ->rx[r]; ry = p8 ->ry[g]; rz = p8 ->rz[b]; X1 = X0 + ((rx == 0) ? 0 : p ->opta[2]); Y1 = Y0 + ((ry == 0) ? 0 : p ->opta[1]); Z1 = Z0 + ((rz == 0) ? 0 : p ->opta[0]); // These are the 6 Tetrahedral for (OutChan=0; OutChan < TotalOut; OutChan++) { c0 = DENS(X0, Y0, Z0); if (rx >= ry && ry >= rz) { c1 = DENS(X1, Y0, Z0) - c0; c2 = DENS(X1, Y1, Z0) - DENS(X1, Y0, Z0); c3 = DENS(X1, Y1, Z1) - DENS(X1, Y1, Z0); } else if (rx >= rz && rz >= ry) { c1 = DENS(X1, Y0, Z0) - c0; c2 = DENS(X1, Y1, Z1) - DENS(X1, Y0, Z1); c3 = DENS(X1, Y0, Z1) - DENS(X1, Y0, Z0); } else if (rz >= rx && rx >= ry) { c1 = DENS(X1, Y0, Z1) - DENS(X0, Y0, Z1); c2 = DENS(X1, Y1, Z1) - DENS(X1, Y0, Z1); c3 = DENS(X0, Y0, Z1) - c0; } else if (ry >= rx && rx >= rz) { c1 = DENS(X1, Y1, Z0) - DENS(X0, Y1, Z0); c2 = DENS(X0, Y1, Z0) - c0; c3 = DENS(X1, Y1, Z1) - DENS(X1, Y1, Z0); } else if (ry >= rz && rz >= rx) { c1 = DENS(X1, Y1, Z1) - DENS(X0, Y1, Z1); c2 = DENS(X0, Y1, Z0) - c0; c3 = DENS(X0, Y1, Z1) - DENS(X0, Y1, Z0); } else if (rz >= ry && ry >= rx) { c1 = DENS(X1, Y1, Z1) - DENS(X0, Y1, Z1); c2 = DENS(X0, Y1, Z1) - DENS(X0, Y0, Z1); c3 = DENS(X0, Y0, Z1) - c0; } else { c1 = c2 = c3 = 0; } Rest = c1 * rx + c2 * ry + c3 * rz; Output[OutChan] = (cmsUInt16Number)c0 + ROUND_FIXED_TO_INT(_cmsToFixedDomain(Rest)); } } #undef DENS // Curves that contain wide empty areas are not optimizeable static cmsBool IsDegenerated(const cmsToneCurve* g) { int i, Zeros = 0, Poles = 0; int nEntries = g ->nEntries; for (i=0; i < nEntries; i++) { if (g ->Table16[i] == 0x0000) Zeros++; if (g ->Table16[i] == 0xffff) Poles++; } if (Zeros == 1 && Poles == 1) return FALSE; // For linear tables if (Zeros > (nEntries / 4)) return TRUE; // Degenerated, mostly zeros if (Poles > (nEntries / 4)) return TRUE; // Degenerated, mostly poles return FALSE; } // -------------------------------------------------------------------------------------------------------------- // We need xput over here static cmsBool OptimizeByComputingLinearization(cmsPipeline** Lut, cmsUInt32Number Intent, cmsUInt32Number* InputFormat, cmsUInt32Number* OutputFormat, cmsUInt32Number* dwFlags) { cmsPipeline* OriginalLut; int nGridPoints; cmsToneCurve *Trans[cmsMAXCHANNELS], *TransReverse[cmsMAXCHANNELS]; cmsUInt32Number t, i; cmsFloat32Number v, In[cmsMAXCHANNELS], Out[cmsMAXCHANNELS]; cmsBool lIsSuitable, lIsLinear; cmsPipeline* OptimizedLUT = NULL, *LutPlusCurves = NULL; cmsStage* OptimizedCLUTmpe; cmsColorSpaceSignature ColorSpace, OutputColorSpace; cmsStage* OptimizedPrelinMpe; cmsToneCurve** OptimizedPrelinCurves; _cmsStageCLutData* OptimizedPrelinCLUT; // This is a loosy optimization! does not apply in floating-point cases if (_cmsFormatterIsFloat(*InputFormat) || _cmsFormatterIsFloat(*OutputFormat)) return FALSE; // Only on RGB if (T_COLORSPACE(*InputFormat) != PT_RGB) return FALSE; if (T_COLORSPACE(*OutputFormat) != PT_RGB) return FALSE; // On 16 bits, user has to specify the feature if (!_cmsFormatterIs8bit(*InputFormat)) { if (!(*dwFlags & cmsFLAGS_CLUT_PRE_LINEARIZATION)) return FALSE; } OriginalLut = *Lut; ColorSpace = _cmsICCcolorSpace(T_COLORSPACE(*InputFormat)); OutputColorSpace = _cmsICCcolorSpace(T_COLORSPACE(*OutputFormat)); nGridPoints = _cmsReasonableGridpointsByColorspace(ColorSpace, *dwFlags); // Empty gamma containers memset(Trans, 0, sizeof(Trans)); memset(TransReverse, 0, sizeof(TransReverse)); for (t = 0; t < OriginalLut ->InputChannels; t++) { Trans[t] = cmsBuildTabulatedToneCurve16(OriginalLut ->ContextID, PRELINEARIZATION_POINTS, NULL); if (Trans[t] == NULL) goto Error; } // Populate the curves for (i=0; i < PRELINEARIZATION_POINTS; i++) { v = (cmsFloat32Number) ((cmsFloat64Number) i / (PRELINEARIZATION_POINTS - 1)); // Feed input with a gray ramp for (t=0; t < OriginalLut ->InputChannels; t++) In[t] = v; // Evaluate the gray value cmsPipelineEvalFloat(In, Out, OriginalLut); // Store result in curve for (t=0; t < OriginalLut ->InputChannels; t++) Trans[t] ->Table16[i] = _cmsQuickSaturateWord(Out[t] * 65535.0); } // Slope-limit the obtained curves for (t = 0; t < OriginalLut ->InputChannels; t++) SlopeLimiting(Trans[t]); // Check for validity lIsSuitable = TRUE; lIsLinear = TRUE; for (t=0; (lIsSuitable && (t < OriginalLut ->InputChannels)); t++) { // Exclude if already linear if (!cmsIsToneCurveLinear(Trans[t])) lIsLinear = FALSE; // Exclude if non-monotonic if (!cmsIsToneCurveMonotonic(Trans[t])) lIsSuitable = FALSE; if (IsDegenerated(Trans[t])) lIsSuitable = FALSE; } // If it is not suitable, just quit if (!lIsSuitable) goto Error; // Invert curves if possible for (t = 0; t < OriginalLut ->InputChannels; t++) { TransReverse[t] = cmsReverseToneCurveEx(PRELINEARIZATION_POINTS, Trans[t]); if (TransReverse[t] == NULL) goto Error; } // Now inset the reversed curves at the begin of transform LutPlusCurves = cmsPipelineDup(OriginalLut); if (LutPlusCurves == NULL) goto Error; cmsPipelineInsertStage(LutPlusCurves, cmsAT_BEGIN, cmsStageAllocToneCurves(OriginalLut ->ContextID, OriginalLut ->InputChannels, TransReverse)); // Create the result LUT OptimizedLUT = cmsPipelineAlloc(OriginalLut ->ContextID, OriginalLut ->InputChannels, OriginalLut ->OutputChannels); if (OptimizedLUT == NULL) goto Error; OptimizedPrelinMpe = cmsStageAllocToneCurves(OriginalLut ->ContextID, OriginalLut ->InputChannels, Trans); // Create and insert the curves at the beginning cmsPipelineInsertStage(OptimizedLUT, cmsAT_BEGIN, OptimizedPrelinMpe); // Allocate the CLUT for result OptimizedCLUTmpe = cmsStageAllocCLut16bit(OriginalLut ->ContextID, nGridPoints, OriginalLut ->InputChannels, OriginalLut ->OutputChannels, NULL); // Add the CLUT to the destination LUT cmsPipelineInsertStage(OptimizedLUT, cmsAT_END, OptimizedCLUTmpe); // Resample the LUT if (!cmsStageSampleCLut16bit(OptimizedCLUTmpe, XFormSampler16, (void*) LutPlusCurves, 0)) goto Error; // Free resources for (t = 0; t < OriginalLut ->InputChannels; t++) { if (Trans[t]) cmsFreeToneCurve(Trans[t]); if (TransReverse[t]) cmsFreeToneCurve(TransReverse[t]); } cmsPipelineFree(LutPlusCurves); OptimizedPrelinCurves = _cmsStageGetPtrToCurveSet(OptimizedPrelinMpe); OptimizedPrelinCLUT = (_cmsStageCLutData*) OptimizedCLUTmpe ->Data; // Set the evaluator if 8-bit if (_cmsFormatterIs8bit(*InputFormat)) { Prelin8Data* p8 = PrelinOpt8alloc(OptimizedLUT ->ContextID, OptimizedPrelinCLUT ->Params, OptimizedPrelinCurves); if (p8 == NULL) return FALSE; _cmsPipelineSetOptimizationParameters(OptimizedLUT, PrelinEval8, (void*) p8, Prelin8free, Prelin8dup); } else { Prelin16Data* p16 = PrelinOpt16alloc(OptimizedLUT ->ContextID, OptimizedPrelinCLUT ->Params, 3, OptimizedPrelinCurves, 3, NULL); if (p16 == NULL) return FALSE; _cmsPipelineSetOptimizationParameters(OptimizedLUT, PrelinEval16, (void*) p16, PrelinOpt16free, Prelin16dup); } // Don't fix white on absolute colorimetric if (Intent == INTENT_ABSOLUTE_COLORIMETRIC) *dwFlags |= cmsFLAGS_NOWHITEONWHITEFIXUP; if (!(*dwFlags & cmsFLAGS_NOWHITEONWHITEFIXUP)) { if (!FixWhiteMisalignment(OptimizedLUT, ColorSpace, OutputColorSpace)) { return FALSE; } } // And return the obtained LUT cmsPipelineFree(OriginalLut); *Lut = OptimizedLUT; return TRUE; Error: for (t = 0; t < OriginalLut ->InputChannels; t++) { if (Trans[t]) cmsFreeToneCurve(Trans[t]); if (TransReverse[t]) cmsFreeToneCurve(TransReverse[t]); } if (LutPlusCurves != NULL) cmsPipelineFree(LutPlusCurves); if (OptimizedLUT != NULL) cmsPipelineFree(OptimizedLUT); return FALSE; cmsUNUSED_PARAMETER(Intent); } // Curves optimizer ------------------------------------------------------------------------------------------------------------------ static void CurvesFree(cmsContext ContextID, void* ptr) { Curves16Data* Data = (Curves16Data*) ptr; int i; for (i=0; i < Data -> nCurves; i++) { _cmsFree(ContextID, Data ->Curves[i]); } _cmsFree(ContextID, Data ->Curves); _cmsFree(ContextID, ptr); } static void* CurvesDup(cmsContext ContextID, const void* ptr) { Curves16Data* Data = _cmsDupMem(ContextID, ptr, sizeof(Curves16Data)); int i; if (Data == NULL) return NULL; Data ->Curves = _cmsDupMem(ContextID, Data ->Curves, Data ->nCurves * sizeof(cmsUInt16Number*)); for (i=0; i < Data -> nCurves; i++) { Data ->Curves[i] = _cmsDupMem(ContextID, Data ->Curves[i], Data -> nElements * sizeof(cmsUInt16Number)); } return (void*) Data; } // Precomputes tables for 8-bit on input devicelink. static Curves16Data* CurvesAlloc(cmsContext ContextID, int nCurves, int nElements, cmsToneCurve** G) { int i, j; Curves16Data* c16; c16 = _cmsMallocZero(ContextID, sizeof(Curves16Data)); if (c16 == NULL) return NULL; c16 ->nCurves = nCurves; c16 ->nElements = nElements; c16 ->Curves = _cmsCalloc(ContextID, nCurves, sizeof(cmsUInt16Number*)); if (c16 ->Curves == NULL) return NULL; for (i=0; i < nCurves; i++) { c16->Curves[i] = _cmsCalloc(ContextID, nElements, sizeof(cmsUInt16Number)); if (nElements == 256) { for (j=0; j < nElements; j++) { c16 ->Curves[i][j] = cmsEvalToneCurve16(G[i], FROM_8_TO_16(j)); } } else { for (j=0; j < nElements; j++) { c16 ->Curves[i][j] = cmsEvalToneCurve16(G[i], (cmsUInt16Number) j); } } } return c16; } static void FastEvaluateCurves8(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register const void* D) { Curves16Data* Data = (Curves16Data*) D; cmsUInt8Number x; int i; for (i=0; i < Data ->nCurves; i++) { x = (In[i] >> 8); Out[i] = Data -> Curves[i][x]; } } static void FastEvaluateCurves16(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register const void* D) { Curves16Data* Data = (Curves16Data*) D; int i; for (i=0; i < Data ->nCurves; i++) { Out[i] = Data -> Curves[i][In[i]]; } } static void FastIdentity16(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register const void* D) { cmsPipeline* Lut = (cmsPipeline*) D; cmsUInt32Number i; for (i=0; i < Lut ->InputChannels; i++) { Out[i] = In[i]; } } // If the target LUT holds only curves, the optimization procedure is to join all those // curves together. That only works on curves and does not work on matrices. static cmsBool OptimizeByJoiningCurves(cmsPipeline** Lut, cmsUInt32Number Intent, cmsUInt32Number* InputFormat, cmsUInt32Number* OutputFormat, cmsUInt32Number* dwFlags) { cmsToneCurve** GammaTables = NULL; cmsFloat32Number InFloat[cmsMAXCHANNELS], OutFloat[cmsMAXCHANNELS]; cmsUInt32Number i, j; cmsPipeline* Src = *Lut; cmsPipeline* Dest = NULL; cmsStage* mpe; cmsStage* ObtainedCurves = NULL; // This is a loosy optimization! does not apply in floating-point cases if (_cmsFormatterIsFloat(*InputFormat) || _cmsFormatterIsFloat(*OutputFormat)) return FALSE; // Only curves in this LUT? for (mpe = cmsPipelineGetPtrToFirstStage(Src); mpe != NULL; mpe = cmsStageNext(mpe)) { if (cmsStageType(mpe) != cmsSigCurveSetElemType) return FALSE; } // Allocate an empty LUT Dest = cmsPipelineAlloc(Src ->ContextID, Src ->InputChannels, Src ->OutputChannels); if (Dest == NULL) return FALSE; // Create target curves GammaTables = (cmsToneCurve**) _cmsCalloc(Src ->ContextID, Src ->InputChannels, sizeof(cmsToneCurve*)); if (GammaTables == NULL) goto Error; for (i=0; i < Src ->InputChannels; i++) { GammaTables[i] = cmsBuildTabulatedToneCurve16(Src ->ContextID, PRELINEARIZATION_POINTS, NULL); if (GammaTables[i] == NULL) goto Error; } // Compute 16 bit result by using floating point for (i=0; i < PRELINEARIZATION_POINTS; i++) { for (j=0; j < Src ->InputChannels; j++) InFloat[j] = (cmsFloat32Number) ((cmsFloat64Number) i / (PRELINEARIZATION_POINTS - 1)); cmsPipelineEvalFloat(InFloat, OutFloat, Src); for (j=0; j < Src ->InputChannels; j++) GammaTables[j] -> Table16[i] = _cmsQuickSaturateWord(OutFloat[j] * 65535.0); } ObtainedCurves = cmsStageAllocToneCurves(Src ->ContextID, Src ->InputChannels, GammaTables); if (ObtainedCurves == NULL) goto Error; for (i=0; i < Src ->InputChannels; i++) { cmsFreeToneCurve(GammaTables[i]); GammaTables[i] = NULL; } if (GammaTables != NULL) _cmsFree(Src ->ContextID, GammaTables); // Maybe the curves are linear at the end if (!AllCurvesAreLinear(ObtainedCurves)) { cmsPipelineInsertStage(Dest, cmsAT_BEGIN, ObtainedCurves); // If the curves are to be applied in 8 bits, we can save memory if (_cmsFormatterIs8bit(*InputFormat)) { _cmsStageToneCurvesData* Data = (_cmsStageToneCurvesData*) ObtainedCurves ->Data; Curves16Data* c16 = CurvesAlloc(Dest ->ContextID, Data ->nCurves, 256, Data ->TheCurves); *dwFlags |= cmsFLAGS_NOCACHE; _cmsPipelineSetOptimizationParameters(Dest, FastEvaluateCurves8, c16, CurvesFree, CurvesDup); } else { _cmsStageToneCurvesData* Data = (_cmsStageToneCurvesData*) cmsStageData(ObtainedCurves); Curves16Data* c16 = CurvesAlloc(Dest ->ContextID, Data ->nCurves, 65536, Data ->TheCurves); *dwFlags |= cmsFLAGS_NOCACHE; _cmsPipelineSetOptimizationParameters(Dest, FastEvaluateCurves16, c16, CurvesFree, CurvesDup); } } else { // LUT optimizes to nothing. Set the identity LUT cmsStageFree(ObtainedCurves); cmsPipelineInsertStage(Dest, cmsAT_BEGIN, cmsStageAllocIdentity(Dest ->ContextID, Src ->InputChannels)); *dwFlags |= cmsFLAGS_NOCACHE; _cmsPipelineSetOptimizationParameters(Dest, FastIdentity16, (void*) Dest, NULL, NULL); } // We are done. cmsPipelineFree(Src); *Lut = Dest; return TRUE; Error: if (ObtainedCurves != NULL) cmsStageFree(ObtainedCurves); if (GammaTables != NULL) { for (i=0; i < Src ->InputChannels; i++) { if (GammaTables[i] != NULL) cmsFreeToneCurve(GammaTables[i]); } _cmsFree(Src ->ContextID, GammaTables); } if (Dest != NULL) cmsPipelineFree(Dest); return FALSE; cmsUNUSED_PARAMETER(Intent); cmsUNUSED_PARAMETER(InputFormat); cmsUNUSED_PARAMETER(OutputFormat); cmsUNUSED_PARAMETER(dwFlags); } // ------------------------------------------------------------------------------------------------------------------------------------- // LUT is Shaper - Matrix - Matrix - Shaper, which is very frequent when combining two matrix-shaper profiles static void FreeMatShaper(cmsContext ContextID, void* Data) { if (Data != NULL) _cmsFree(ContextID, Data); } static void* DupMatShaper(cmsContext ContextID, const void* Data) { return _cmsDupMem(ContextID, Data, sizeof(MatShaper8Data)); } // A fast matrix-shaper evaluator for 8 bits. This is a bit ticky since I'm using 1.14 signed fixed point // to accomplish some performance. Actually it takes 256x3 16 bits tables and 16385 x 3 tables of 8 bits, // in total about 50K, and the performance boost is huge! static void MatShaperEval16(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register const void* D) { MatShaper8Data* p = (MatShaper8Data*) D; cmsS1Fixed14Number l1, l2, l3, r, g, b; cmsUInt32Number ri, gi, bi; // In this case (and only in this case!) we can use this simplification since // In[] is assured to come from a 8 bit number. (a << 8 | a) ri = In[0] & 0xFF; gi = In[1] & 0xFF; bi = In[2] & 0xFF; // Across first shaper, which also converts to 1.14 fixed point r = p->Shaper1R[ri]; g = p->Shaper1G[gi]; b = p->Shaper1B[bi]; // Evaluate the matrix in 1.14 fixed point l1 = (p->Mat[0][0] * r + p->Mat[0][1] * g + p->Mat[0][2] * b + p->Off[0] + 0x2000) >> 14; l2 = (p->Mat[1][0] * r + p->Mat[1][1] * g + p->Mat[1][2] * b + p->Off[1] + 0x2000) >> 14; l3 = (p->Mat[2][0] * r + p->Mat[2][1] * g + p->Mat[2][2] * b + p->Off[2] + 0x2000) >> 14; // Now we have to clip to 0..1.0 range ri = (l1 < 0) ? 0 : ((l1 > 16384) ? 16384 : l1); gi = (l2 < 0) ? 0 : ((l2 > 16384) ? 16384 : l2); bi = (l3 < 0) ? 0 : ((l3 > 16384) ? 16384 : l3); // And across second shaper, Out[0] = p->Shaper2R[ri]; Out[1] = p->Shaper2G[gi]; Out[2] = p->Shaper2B[bi]; } // This table converts from 8 bits to 1.14 after applying the curve static void FillFirstShaper(cmsS1Fixed14Number* Table, cmsToneCurve* Curve) { int i; cmsFloat32Number R, y; for (i=0; i < 256; i++) { R = (cmsFloat32Number) (i / 255.0); y = cmsEvalToneCurveFloat(Curve, R); Table[i] = DOUBLE_TO_1FIXED14(y); } } // This table converts form 1.14 (being 0x4000 the last entry) to 8 bits after applying the curve static void FillSecondShaper(cmsUInt16Number* Table, cmsToneCurve* Curve, cmsBool Is8BitsOutput) { int i; cmsFloat32Number R, Val; for (i=0; i < 16385; i++) { R = (cmsFloat32Number) (i / 16384.0); Val = cmsEvalToneCurveFloat(Curve, R); // Val comes 0..1.0 if (Is8BitsOutput) { // If 8 bits output, we can optimize further by computing the / 257 part. // first we compute the resulting byte and then we store the byte times // 257. This quantization allows to round very quick by doing a >> 8, but // since the low byte is always equal to msb, we can do a & 0xff and this works! cmsUInt16Number w = _cmsQuickSaturateWord(Val * 65535.0 + 0.5); cmsUInt8Number b = FROM_16_TO_8(w); Table[i] = FROM_8_TO_16(b); } else Table[i] = _cmsQuickSaturateWord(Val * 65535.0 + 0.5); } } // Compute the matrix-shaper structure static cmsBool SetMatShaper(cmsPipeline* Dest, cmsToneCurve* Curve1[3], cmsMAT3* Mat, cmsVEC3* Off, cmsToneCurve* Curve2[3], cmsUInt32Number* OutputFormat) { MatShaper8Data* p; int i, j; cmsBool Is8Bits = _cmsFormatterIs8bit(*OutputFormat); // Allocate a big chuck of memory to store precomputed tables p = (MatShaper8Data*) _cmsMalloc(Dest ->ContextID, sizeof(MatShaper8Data)); if (p == NULL) return FALSE; p -> ContextID = Dest -> ContextID; // Precompute tables FillFirstShaper(p ->Shaper1R, Curve1[0]); FillFirstShaper(p ->Shaper1G, Curve1[1]); FillFirstShaper(p ->Shaper1B, Curve1[2]); FillSecondShaper(p ->Shaper2R, Curve2[0], Is8Bits); FillSecondShaper(p ->Shaper2G, Curve2[1], Is8Bits); FillSecondShaper(p ->Shaper2B, Curve2[2], Is8Bits); // Convert matrix to nFixed14. Note that those values may take more than 16 bits as for (i=0; i < 3; i++) { for (j=0; j < 3; j++) { p ->Mat[i][j] = DOUBLE_TO_1FIXED14(Mat->v[i].n[j]); } } for (i=0; i < 3; i++) { if (Off == NULL) { p ->Off[i] = 0; } else { p ->Off[i] = DOUBLE_TO_1FIXED14(Off->n[i]); } } // Mark as optimized for faster formatter if (Is8Bits) *OutputFormat |= OPTIMIZED_SH(1); // Fill function pointers _cmsPipelineSetOptimizationParameters(Dest, MatShaperEval16, (void*) p, FreeMatShaper, DupMatShaper); return TRUE; } // 8 bits on input allows matrix-shaper boot up to 25 Mpixels per second on RGB. That's fast! // TODO: Allow a third matrix for abs. colorimetric static cmsBool OptimizeMatrixShaper(cmsPipeline** Lut, cmsUInt32Number Intent, cmsUInt32Number* InputFormat, cmsUInt32Number* OutputFormat, cmsUInt32Number* dwFlags) { cmsStage* Curve1, *Curve2; cmsStage* Matrix1, *Matrix2; _cmsStageMatrixData* Data1; _cmsStageMatrixData* Data2; cmsMAT3 res; cmsBool IdentityMat; cmsPipeline* Dest, *Src; // Only works on RGB to RGB if (T_CHANNELS(*InputFormat) != 3 || T_CHANNELS(*OutputFormat) != 3) return FALSE; // Only works on 8 bit input if (!_cmsFormatterIs8bit(*InputFormat)) return FALSE; // Seems suitable, proceed Src = *Lut; // Check for shaper-matrix-matrix-shaper structure, that is what this optimizer stands for if (!cmsPipelineCheckAndRetreiveStages(Src, 4, cmsSigCurveSetElemType, cmsSigMatrixElemType, cmsSigMatrixElemType, cmsSigCurveSetElemType, &Curve1, &Matrix1, &Matrix2, &Curve2)) return FALSE; // Get both matrices Data1 = (_cmsStageMatrixData*) cmsStageData(Matrix1); Data2 = (_cmsStageMatrixData*) cmsStageData(Matrix2); // Input offset should be zero if (Data1 ->Offset != NULL) return FALSE; // Multiply both matrices to get the result _cmsMAT3per(&res, (cmsMAT3*) Data2 ->Double, (cmsMAT3*) Data1 ->Double); // Now the result is in res + Data2 -> Offset. Maybe is a plain identity? IdentityMat = FALSE; if (_cmsMAT3isIdentity(&res) && Data2 ->Offset == NULL) { // We can get rid of full matrix IdentityMat = TRUE; } // Allocate an empty LUT Dest = cmsPipelineAlloc(Src ->ContextID, Src ->InputChannels, Src ->OutputChannels); if (!Dest) return FALSE; // Assamble the new LUT cmsPipelineInsertStage(Dest, cmsAT_BEGIN, cmsStageDup(Curve1)); if (!IdentityMat) cmsPipelineInsertStage(Dest, cmsAT_END, cmsStageAllocMatrix(Dest ->ContextID, 3, 3, (const cmsFloat64Number*) &res, Data2 ->Offset)); cmsPipelineInsertStage(Dest, cmsAT_END, cmsStageDup(Curve2)); // If identity on matrix, we can further optimize the curves, so call the join curves routine if (IdentityMat) { OptimizeByJoiningCurves(&Dest, Intent, InputFormat, OutputFormat, dwFlags); } else { _cmsStageToneCurvesData* mpeC1 = (_cmsStageToneCurvesData*) cmsStageData(Curve1); _cmsStageToneCurvesData* mpeC2 = (_cmsStageToneCurvesData*) cmsStageData(Curve2); // In this particular optimization, caché does not help as it takes more time to deal with // the caché that with the pixel handling *dwFlags |= cmsFLAGS_NOCACHE; // Setup the optimizarion routines SetMatShaper(Dest, mpeC1 ->TheCurves, &res, (cmsVEC3*) Data2 ->Offset, mpeC2->TheCurves, OutputFormat); } cmsPipelineFree(Src); *Lut = Dest; return TRUE; } // ------------------------------------------------------------------------------------------------------------------------------------- // Optimization plug-ins // List of optimizations typedef struct _cmsOptimizationCollection_st { _cmsOPToptimizeFn OptimizePtr; struct _cmsOptimizationCollection_st *Next; } _cmsOptimizationCollection; // The built-in list. We currently implement 4 types of optimizations. Joining of curves, matrix-shaper, linearization and resampling static _cmsOptimizationCollection DefaultOptimization[] = { { OptimizeByJoiningCurves, &DefaultOptimization[1] }, { OptimizeMatrixShaper, &DefaultOptimization[2] }, { OptimizeByComputingLinearization, &DefaultOptimization[3] }, { OptimizeByResampling, NULL } }; // The linked list head static _cmsOptimizationCollection* OptimizationCollection = DefaultOptimization; // Register new ways to optimize cmsBool _cmsRegisterOptimizationPlugin(cmsPluginBase* Data) { cmsPluginOptimization* Plugin = (cmsPluginOptimization*) Data; _cmsOptimizationCollection* fl; if (Data == NULL) { OptimizationCollection = DefaultOptimization; return TRUE; } // Optimizer callback is required if (Plugin ->OptimizePtr == NULL) return FALSE; fl = (_cmsOptimizationCollection*) _cmsPluginMalloc(sizeof(_cmsOptimizationCollection)); if (fl == NULL) return FALSE; // Copy the parameters fl ->OptimizePtr = Plugin ->OptimizePtr; // Keep linked list fl ->Next = OptimizationCollection; OptimizationCollection = fl; // All is ok return TRUE; } // The entry point for LUT optimization cmsBool _cmsOptimizePipeline(cmsPipeline** PtrLut, int Intent, cmsUInt32Number* InputFormat, cmsUInt32Number* OutputFormat, cmsUInt32Number* dwFlags) { _cmsOptimizationCollection* Opts; cmsBool AnySuccess = FALSE; // A CLUT is being asked, so force this specific optimization if (*dwFlags & cmsFLAGS_FORCE_CLUT) { PreOptimize(*PtrLut); return OptimizeByResampling(PtrLut, Intent, InputFormat, OutputFormat, dwFlags); } // Anything to optimize? if ((*PtrLut) ->Elements == NULL) { _cmsPipelineSetOptimizationParameters(*PtrLut, FastIdentity16, (void*) *PtrLut, NULL, NULL); return TRUE; } // Try to get rid of identities and trivial conversions. AnySuccess = PreOptimize(*PtrLut); // After removal do we end with an identity? if ((*PtrLut) ->Elements == NULL) { _cmsPipelineSetOptimizationParameters(*PtrLut, FastIdentity16, (void*) *PtrLut, NULL, NULL); return TRUE; } // Do not optimize, keep all precision if (*dwFlags & cmsFLAGS_NOOPTIMIZE) return FALSE; // Try built-in optimizations and plug-in for (Opts = OptimizationCollection; Opts != NULL; Opts = Opts ->Next) { // If one schema succeeded, we are done if (Opts ->OptimizePtr(PtrLut, Intent, InputFormat, OutputFormat, dwFlags)) { return TRUE; // Optimized! } } // Only simple optimizations succeeded return AnySuccess; }