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authorNicolas Pena <npm@chromium.org>2017-08-10 16:36:56 -0400
committerChromium commit bot <commit-bot@chromium.org>2017-08-10 20:54:00 +0000
commitf7520395821090b36a5ad8c658a844c3342dbf66 (patch)
treeabe5505e60a57479593d6c39790fe214c23f9fef /third_party/lcms/src/cmsopt.c
parenta12812924fc844823025fa383cc3ec8c1d1e2d4f (diff)
downloadpdfium-f7520395821090b36a5ad8c658a844c3342dbf66.tar.xz
LCMS: rename folder
Change-Id: I5f240cb0779648dc5427fecb5561086e7c0fb16a Reviewed-on: https://pdfium-review.googlesource.com/10650 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Nicolás Peña <npm@chromium.org>
Diffstat (limited to 'third_party/lcms/src/cmsopt.c')
-rw-r--r--third_party/lcms/src/cmsopt.c1811
1 files changed, 1811 insertions, 0 deletions
diff --git a/third_party/lcms/src/cmsopt.c b/third_party/lcms/src/cmsopt.c
new file mode 100644
index 0000000000..76de01554c
--- /dev/null
+++ b/third_party/lcms/src/cmsopt.c
@@ -0,0 +1,1811 @@
+//---------------------------------------------------------------------------------
+//
+// 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;
+
+ _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;
+
+ 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);
+
+ // Remove float pcs Lab conversions
+ Opt |= _Remove2Op(Lut, cmsSigLab2FloatPCS, cmsSigFloatPCS2Lab);
+
+ // Remove float pcs Lab conversions
+ Opt |= _Remove2Op(Lut, cmsSigXYZ2FloatPCS, cmsSigFloatPCS2XYZ);
+
+ 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];
+ cmsUInt16Number StageDEF[cmsMAXCHANNELS];
+ int i;
+
+ for (i=0; i < p16 ->nInputs; i++) {
+
+ p16 ->EvalCurveIn16[i](&Input[i], &StageABC[i], p16 ->ParamsCurveIn16[i]);
+ }
+
+ p16 ->EvalCLUT(StageABC, StageDEF, p16 ->CLUTparams);
+
+ for (i=0; i < p16 ->nOutputs; i++) {
+
+ p16 ->EvalCurveOut16[i](&StageDEF[i], &Output[i], p16 ->ParamsCurveOut16[i]);
+ }
+}
+
+
+static
+void PrelinOpt16free(cmsContext ContextID, void* ptr)
+{
+ Prelin16Data* p16 = (Prelin16Data*) ptr;
+
+ _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 ->EvalCurveOut16 = (_cmsInterpFn16*)_cmsDupMem(ContextID, p16 ->EvalCurveOut16, p16 ->nOutputs * sizeof(_cmsInterpFn16));
+ Duped ->ParamsCurveOut16 = (cmsInterpParams**)_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 = _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 -> 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 stage");
+ return FALSE;
+ }
+
+ if (nChannelsIn != 1 && nChannelsIn != 3 && nChannelsIn != 4) {
+ cmsSignalError(CLUT->ContextID, cmsERROR_INTERNAL, "(internal) %d Channels are not supported on PatchLUT", nChannelsIn);
+ return FALSE;
+ }
+ if (nChannelsIn == 4) {
+
+ 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 (((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) {
+
+ 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;
+
+ x0 = (int) floor(px);
+ y0 = (int) floor(py);
+ z0 = (int) floor(pz);
+
+ 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) {
+
+ px = ((cmsFloat64Number) At[0] * (p16->Domain[0])) / 65535.0;
+
+ x0 = (int) floor(px);
+
+ 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 or very different
+static
+cmsBool WhitesAreEqual(int n, cmsUInt16Number White1[], cmsUInt16Number White2[] )
+{
+ int i;
+
+ for (i=0; i < n; i++) {
+
+ if (abs(White1[i] - White2[i]) > 0xf000) return TRUE; // Values are so extremly different that the fixup should be avoided
+ 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?
+ if (Lut ->InputChannels != nIns) return FALSE;
+ if (Lut ->OutputChannels != nOuts) return FALSE;
+
+ 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]);
+ if (InversePostLin == NULL) {
+ WhiteOut[i] = WhitePointOut[i];
+
+ } else {
+
+ 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 = NULL;
+ cmsPipeline* Dest = NULL;
+ cmsStage* mpe;
+ 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;
+
+ // Named color pipelines cannot be optimized either
+ for (mpe = cmsPipelineGetPtrToFirstStage(Src);
+ mpe != NULL;
+ mpe = cmsStageNext(mpe)) {
+ if (cmsStageType(mpe) == cmsSigNamedColorElemType) return FALSE;
+ }
+
+ // 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);
+ if(!cmsPipelineInsertStage(Dest, cmsAT_BEGIN, NewPreLin))
+ goto Error;
+
+ // 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) goto Error;
+
+ // Add the CLUT to the destination LUT
+ if (!cmsPipelineInsertStage(Dest, cmsAT_END, CLUT)) {
+ goto Error;
+ }
+
+ // 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);
+ if (!cmsPipelineInsertStage(Dest, cmsAT_END, NewPostLin))
+ goto Error;
+
+ // 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)) {
+Error:
+ // Ops, something went wrong, Restore stages
+ if (KeepPreLin != NULL) {
+ if (!cmsPipelineInsertStage(Src, cmsAT_BEGIN, KeepPreLin)) {
+ _cmsAssert(0); // This never happens
+ }
+ }
+ if (KeepPostLin != NULL) {
+ if (!cmsPipelineInsertStage(Src, cmsAT_END, KeepPostLin)) {
+ _cmsAssert(0); // This never happens
+ }
+ }
+ 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 = (Prelin8Data*)_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 = (const cmsUInt16Number*)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 + 0x8001;
+ Output[OutChan] = (cmsUInt16Number)c0 + ((Rest + (Rest>>16))>>16);
+
+ }
+}
+
+#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;
+ cmsStage* mpe;
+ 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;
+
+ // Named color pipelines cannot be optimized either
+ for (mpe = cmsPipelineGetPtrToFirstStage(OriginalLut);
+ mpe != NULL;
+ mpe = cmsStageNext(mpe)) {
+ if (cmsStageType(mpe) == cmsSigNamedColorElemType) return FALSE;
+ }
+
+ 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;
+
+ if (!cmsPipelineInsertStage(LutPlusCurves, cmsAT_BEGIN, cmsStageAllocToneCurves(OriginalLut ->ContextID, OriginalLut ->InputChannels, TransReverse)))
+ goto Error;
+
+ // 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
+ if (!cmsPipelineInsertStage(OptimizedLUT, cmsAT_BEGIN, OptimizedPrelinMpe))
+ goto Error;
+
+ // Allocate the CLUT for result
+ OptimizedCLUTmpe = cmsStageAllocCLut16bit(OriginalLut ->ContextID, nGridPoints, OriginalLut ->InputChannels, OriginalLut ->OutputChannels, NULL);
+
+ // Add the CLUT to the destination LUT
+ if (!cmsPipelineInsertStage(OptimizedLUT, cmsAT_END, OptimizedCLUTmpe))
+ goto Error;
+
+ // 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 = (Curves16Data*)_cmsDupMem(ContextID, ptr, sizeof(Curves16Data));
+ int i;
+
+ if (Data == NULL) return NULL;
+
+ Data ->Curves = (cmsUInt16Number**)_cmsDupMem(ContextID, Data ->Curves, Data ->nCurves * sizeof(cmsUInt16Number*));
+
+ for (i=0; i < Data -> nCurves; i++) {
+ Data ->Curves[i] = (cmsUInt16Number*)_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 = (Curves16Data*)_cmsMallocZero(ContextID, sizeof(Curves16Data));
+ if (c16 == NULL) return NULL;
+
+ c16 ->nCurves = nCurves;
+ c16 ->nElements = nElements;
+
+ c16 ->Curves = (cmsUInt16Number**)_cmsCalloc(ContextID, nCurves, sizeof(cmsUInt16Number*));
+ if (c16 ->Curves == NULL) return NULL;
+
+ for (i=0; i < nCurves; i++) {
+
+ c16->Curves[i] = (cmsUInt16Number*)_cmsCalloc(ContextID, nElements, sizeof(cmsUInt16Number));
+
+ if (c16->Curves[i] == NULL) {
+
+ for (j=0; j < i; j++) {
+ _cmsFree(ContextID, c16->Curves[j]);
+ }
+ _cmsFree(ContextID, c16->Curves);
+ _cmsFree(ContextID, c16);
+ return NULL;
+ }
+
+ 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)) {
+
+ if (!cmsPipelineInsertStage(Dest, cmsAT_BEGIN, ObtainedCurves))
+ goto Error;
+
+ // 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);
+
+ if (c16 == NULL) goto Error;
+ *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);
+
+ if (c16 == NULL) goto Error;
+ *dwFlags |= cmsFLAGS_NOCACHE;
+ _cmsPipelineSetOptimizationParameters(Dest, FastEvaluateCurves16, c16, CurvesFree, CurvesDup);
+ }
+ }
+ else {
+
+ // LUT optimizes to nothing. Set the identity LUT
+ cmsStageFree(ObtainedCurves);
+
+ if (!cmsPipelineInsertStage(Dest, cmsAT_BEGIN, cmsStageAllocIdentity(Dest ->ContextID, Src ->InputChannels)))
+ goto Error;
+
+ *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
+cmsBool 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);
+ if (isinf(y))
+ return FALSE;
+
+ Table[i] = DOUBLE_TO_1FIXED14(y);
+ }
+ return TRUE;
+}
+
+// This table converts form 1.14 (being 0x4000 the last entry) to 8 bits after applying the curve
+static
+cmsBool 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 (isinf(Val))
+ return FALSE;
+
+ 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);
+ cmsUInt8Number b = FROM_16_TO_8(w);
+
+ Table[i] = FROM_8_TO_16(b);
+ }
+ else Table[i] = _cmsQuickSaturateWord(Val * 65535.0);
+ }
+ return TRUE;
+}
+
+// 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
+ if (!FillFirstShaper(p ->Shaper1R, Curve1[0]))
+ goto Error;
+ if (!FillFirstShaper(p ->Shaper1G, Curve1[1]))
+ goto Error;
+ if (!FillFirstShaper(p ->Shaper1B, Curve1[2]))
+ goto Error;
+
+ if (!FillSecondShaper(p ->Shaper2R, Curve2[0], Is8Bits))
+ goto Error;
+ if (!FillSecondShaper(p ->Shaper2G, Curve2[1], Is8Bits))
+ goto Error;
+ if (!FillSecondShaper(p ->Shaper2B, Curve2[2], Is8Bits))
+ goto Error;
+
+ // 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;
+Error:
+ _cmsFree(Dest->ContextID, p);
+ return FALSE;
+}
+
+// 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
+ if (!cmsPipelineInsertStage(Dest, cmsAT_BEGIN, cmsStageDup(Curve1)))
+ goto Error;
+
+ if (!IdentityMat)
+ if (!cmsPipelineInsertStage(Dest, cmsAT_END, cmsStageAllocMatrix(Dest ->ContextID, 3, 3, (const cmsFloat64Number*) &res, Data2 ->Offset)))
+ goto Error;
+ if (!cmsPipelineInsertStage(Dest, cmsAT_END, cmsStageDup(Curve2)))
+ goto Error;
+
+ // 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, cach?does not help as it takes more time to deal with
+ // the cach?that with the pixel handling
+ *dwFlags |= cmsFLAGS_NOCACHE;
+
+ // Setup the optimizarion routines
+ if (!SetMatShaper(Dest, mpeC1 ->TheCurves, &res, (cmsVEC3*) Data2 ->Offset, mpeC2->TheCurves, OutputFormat))
+ goto Error;
+ }
+
+ cmsPipelineFree(Src);
+ *Lut = Dest;
+ return TRUE;
+Error:
+ // Leave Src unchanged
+ cmsPipelineFree(Dest);
+ return FALSE;
+}
+
+
+// -------------------------------------------------------------------------------------------------------------------------------------
+// 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
+_cmsOptimizationPluginChunkType _cmsOptimizationPluginChunk = { NULL };
+
+
+// Duplicates the zone of memory used by the plug-in in the new context
+static
+void DupPluginOptimizationList(struct _cmsContext_struct* ctx,
+ const struct _cmsContext_struct* src)
+{
+ _cmsOptimizationPluginChunkType newHead = { NULL };
+ _cmsOptimizationCollection* entry;
+ _cmsOptimizationCollection* Anterior = NULL;
+ _cmsOptimizationPluginChunkType* head = (_cmsOptimizationPluginChunkType*) src->chunks[OptimizationPlugin];
+
+ _cmsAssert(ctx != NULL);
+ _cmsAssert(head != NULL);
+
+ // Walk the list copying all nodes
+ for (entry = head->OptimizationCollection;
+ entry != NULL;
+ entry = entry ->Next) {
+
+ _cmsOptimizationCollection *newEntry = ( _cmsOptimizationCollection *) _cmsSubAllocDup(ctx ->MemPool, entry, sizeof(_cmsOptimizationCollection));
+
+ if (newEntry == NULL)
+ return;
+
+ // We want to keep the linked list order, so this is a little bit tricky
+ newEntry -> Next = NULL;
+ if (Anterior)
+ Anterior -> Next = newEntry;
+
+ Anterior = newEntry;
+
+ if (newHead.OptimizationCollection == NULL)
+ newHead.OptimizationCollection = newEntry;
+ }
+
+ ctx ->chunks[OptimizationPlugin] = _cmsSubAllocDup(ctx->MemPool, &newHead, sizeof(_cmsOptimizationPluginChunkType));
+}
+
+void _cmsAllocOptimizationPluginChunk(struct _cmsContext_struct* ctx,
+ const struct _cmsContext_struct* src)
+{
+ if (src != NULL) {
+
+ // Copy all linked list
+ DupPluginOptimizationList(ctx, src);
+ }
+ else {
+ static _cmsOptimizationPluginChunkType OptimizationPluginChunkType = { NULL };
+ ctx ->chunks[OptimizationPlugin] = _cmsSubAllocDup(ctx ->MemPool, &OptimizationPluginChunkType, sizeof(_cmsOptimizationPluginChunkType));
+ }
+}
+
+
+// Register new ways to optimize
+cmsBool _cmsRegisterOptimizationPlugin(cmsContext ContextID, cmsPluginBase* Data)
+{
+ cmsPluginOptimization* Plugin = (cmsPluginOptimization*) Data;
+ _cmsOptimizationPluginChunkType* ctx = ( _cmsOptimizationPluginChunkType*) _cmsContextGetClientChunk(ContextID, OptimizationPlugin);
+ _cmsOptimizationCollection* fl;
+
+ if (Data == NULL) {
+
+ ctx->OptimizationCollection = NULL;
+ return TRUE;
+ }
+
+ // Optimizer callback is required
+ if (Plugin ->OptimizePtr == NULL) return FALSE;
+
+ fl = (_cmsOptimizationCollection*) _cmsPluginMalloc(ContextID, sizeof(_cmsOptimizationCollection));
+ if (fl == NULL) return FALSE;
+
+ // Copy the parameters
+ fl ->OptimizePtr = Plugin ->OptimizePtr;
+
+ // Keep linked list
+ fl ->Next = ctx->OptimizationCollection;
+
+ // Set the head
+ ctx ->OptimizationCollection = fl;
+
+ // All is ok
+ return TRUE;
+}
+
+// The entry point for LUT optimization
+cmsBool _cmsOptimizePipeline(cmsContext ContextID,
+ cmsPipeline** PtrLut,
+ int Intent,
+ cmsUInt32Number* InputFormat,
+ cmsUInt32Number* OutputFormat,
+ cmsUInt32Number* dwFlags)
+{
+ _cmsOptimizationPluginChunkType* ctx = ( _cmsOptimizationPluginChunkType*) _cmsContextGetClientChunk(ContextID, OptimizationPlugin);
+ _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 plug-in optimizations
+ for (Opts = ctx->OptimizationCollection;
+ Opts != NULL;
+ Opts = Opts ->Next) {
+
+ // If one schema succeeded, we are done
+ if (Opts ->OptimizePtr(PtrLut, Intent, InputFormat, OutputFormat, dwFlags)) {
+
+ return TRUE; // Optimized!
+ }
+ }
+
+ // Try built-in optimizations
+ for (Opts = DefaultOptimization;
+ Opts != NULL;
+ Opts = Opts ->Next) {
+
+ if (Opts ->OptimizePtr(PtrLut, Intent, InputFormat, OutputFormat, dwFlags)) {
+
+ return TRUE;
+ }
+ }
+
+ // Only simple optimizations succeeded
+ return AnySuccess;
+}