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-rw-r--r--src/cmsgmt.c1180
1 files changed, 590 insertions, 590 deletions
diff --git a/src/cmsgmt.c b/src/cmsgmt.c
index 9fec390..37d2a47 100644
--- a/src/cmsgmt.c
+++ b/src/cmsgmt.c
@@ -1,590 +1,590 @@
-//---------------------------------------------------------------------------------
-//
-// Little Color Management System
-// Copyright (c) 1998-2010 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"
-
-
-// Auxiliar: append a Lab identity after the given sequence of profiles
-// and return the transform. Lab profile is closed, rest of profiles are kept open.
-cmsHTRANSFORM _cmsChain2Lab(cmsContext ContextID,
- cmsUInt32Number nProfiles,
- cmsUInt32Number InputFormat,
- cmsUInt32Number OutputFormat,
- const cmsUInt32Number Intents[],
- const cmsHPROFILE hProfiles[],
- const cmsBool BPC[],
- const cmsFloat64Number AdaptationStates[],
- cmsUInt32Number dwFlags)
-{
- cmsHTRANSFORM xform;
- cmsHPROFILE hLab;
- cmsHPROFILE ProfileList[256];
- cmsBool BPCList[256];
- cmsFloat64Number AdaptationList[256];
- cmsUInt32Number IntentList[256];
- cmsUInt32Number i;
-
- // This is a rather big number and there is no need of dynamic memory
- // since we are adding a profile, 254 + 1 = 255 and this is the limit
- if (nProfiles > 254) return NULL;
-
- // The output space
- hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
- if (hLab == NULL) return NULL;
-
- // Create a copy of parameters
- for (i=0; i < nProfiles; i++) {
-
- ProfileList[i] = hProfiles[i];
- BPCList[i] = BPC[i];
- AdaptationList[i] = AdaptationStates[i];
- IntentList[i] = Intents[i];
- }
-
- // Place Lab identity at chain's end.
- ProfileList[nProfiles] = hLab;
- BPCList[nProfiles] = 0;
- AdaptationList[nProfiles] = 1.0;
- IntentList[nProfiles] = INTENT_RELATIVE_COLORIMETRIC;
-
- // Create the transform
- xform = cmsCreateExtendedTransform(ContextID, nProfiles + 1, ProfileList,
- BPCList,
- IntentList,
- AdaptationList,
- NULL, 0,
- InputFormat,
- OutputFormat,
- dwFlags);
-
- cmsCloseProfile(hLab);
-
- return xform;
-}
-
-
-// Compute K -> L* relationship. Flags may include black point compensation. In this case,
-// the relationship is assumed from the profile with BPC to a black point zero.
-static
-cmsToneCurve* ComputeKToLstar(cmsContext ContextID,
- cmsUInt32Number nPoints,
- cmsUInt32Number nProfiles,
- const cmsUInt32Number Intents[],
- const cmsHPROFILE hProfiles[],
- const cmsBool BPC[],
- const cmsFloat64Number AdaptationStates[],
- cmsUInt32Number dwFlags)
-{
- cmsToneCurve* out = NULL;
- cmsUInt32Number i;
- cmsHTRANSFORM xform;
- cmsCIELab Lab;
- cmsFloat32Number cmyk[4];
- cmsFloat32Number* SampledPoints;
-
- xform = _cmsChain2Lab(ContextID, nProfiles, TYPE_CMYK_FLT, TYPE_Lab_DBL, Intents, hProfiles, BPC, AdaptationStates, dwFlags);
- if (xform == NULL) return NULL;
-
- SampledPoints = (cmsFloat32Number*) _cmsCalloc(ContextID, nPoints, sizeof(cmsFloat32Number));
- if (SampledPoints == NULL) goto Error;
-
- for (i=0; i < nPoints; i++) {
-
- cmyk[0] = 0;
- cmyk[1] = 0;
- cmyk[2] = 0;
- cmyk[3] = (cmsFloat32Number) ((i * 100.0) / (nPoints-1));
-
- cmsDoTransform(xform, cmyk, &Lab, 1);
- SampledPoints[i]= (cmsFloat32Number) (1.0 - Lab.L / 100.0); // Negate K for easier operation
- }
-
- out = cmsBuildTabulatedToneCurveFloat(ContextID, nPoints, SampledPoints);
-
-Error:
-
- cmsDeleteTransform(xform);
- if (SampledPoints) _cmsFree(ContextID, SampledPoints);
-
- return out;
-}
-
-
-// Compute Black tone curve on a CMYK -> CMYK transform. This is done by
-// using the proof direction on both profiles to find K->L* relationship
-// then joining both curves. dwFlags may include black point compensation.
-cmsToneCurve* _cmsBuildKToneCurve(cmsContext ContextID,
- cmsUInt32Number nPoints,
- cmsUInt32Number nProfiles,
- const cmsUInt32Number Intents[],
- const cmsHPROFILE hProfiles[],
- const cmsBool BPC[],
- const cmsFloat64Number AdaptationStates[],
- cmsUInt32Number dwFlags)
-{
- cmsToneCurve *in, *out, *KTone;
-
- // Make sure CMYK -> CMYK
- if (cmsGetColorSpace(hProfiles[0]) != cmsSigCmykData ||
- cmsGetColorSpace(hProfiles[nProfiles-1])!= cmsSigCmykData) return NULL;
-
-
- // Make sure last is an output profile
- if (cmsGetDeviceClass(hProfiles[nProfiles - 1]) != cmsSigOutputClass) return NULL;
-
- // Create individual curves. BPC works also as each K to L* is
- // computed as a BPC to zero black point in case of L*
- in = ComputeKToLstar(ContextID, nPoints, nProfiles - 1, Intents, hProfiles, BPC, AdaptationStates, dwFlags);
- if (in == NULL) return NULL;
-
- out = ComputeKToLstar(ContextID, nPoints, 1,
- Intents + (nProfiles - 1),
- hProfiles + (nProfiles - 1),
- BPC + (nProfiles - 1),
- AdaptationStates + (nProfiles - 1),
- dwFlags);
- if (out == NULL) {
- cmsFreeToneCurve(in);
- return NULL;
- }
-
- // Build the relationship. This effectively limits the maximum accuracy to 16 bits, but
- // since this is used on black-preserving LUTs, we are not loosing accuracy in any case
- KTone = cmsJoinToneCurve(ContextID, in, out, nPoints);
-
- // Get rid of components
- cmsFreeToneCurve(in); cmsFreeToneCurve(out);
-
- // Something went wrong...
- if (KTone == NULL) return NULL;
-
- // Make sure it is monotonic
- if (!cmsIsToneCurveMonotonic(KTone)) {
- cmsFreeToneCurve(KTone);
- return NULL;
- }
-
- return KTone;
-}
-
-
-// Gamut LUT Creation -----------------------------------------------------------------------------------------
-
-// Used by gamut & softproofing
-
-typedef struct {
-
- cmsHTRANSFORM hInput; // From whatever input color space. 16 bits to DBL
- cmsHTRANSFORM hForward, hReverse; // Transforms going from Lab to colorant and back
- cmsFloat64Number Thereshold; // The thereshold after which is considered out of gamut
-
- } GAMUTCHAIN;
-
-// This sampler does compute gamut boundaries by comparing original
-// values with a transform going back and forth. Values above ERR_THERESHOLD
-// of maximum are considered out of gamut.
-
-#define ERR_THERESHOLD 5
-
-
-static
-int GamutSampler(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void* Cargo)
-{
- GAMUTCHAIN* t = (GAMUTCHAIN* ) Cargo;
- cmsCIELab LabIn1, LabOut1;
- cmsCIELab LabIn2, LabOut2;
- cmsUInt16Number Proof[cmsMAXCHANNELS], Proof2[cmsMAXCHANNELS];
- cmsFloat64Number dE1, dE2, ErrorRatio;
-
- // Assume in-gamut by default.
- dE1 = 0.;
- dE2 = 0;
- ErrorRatio = 1.0;
-
- // Convert input to Lab
- if (t -> hInput != NULL)
- cmsDoTransform(t -> hInput, In, &LabIn1, 1);
-
- // converts from PCS to colorant. This always
- // does return in-gamut values,
- cmsDoTransform(t -> hForward, &LabIn1, Proof, 1);
-
- // Now, do the inverse, from colorant to PCS.
- cmsDoTransform(t -> hReverse, Proof, &LabOut1, 1);
-
- memmove(&LabIn2, &LabOut1, sizeof(cmsCIELab));
-
- // Try again, but this time taking Check as input
- cmsDoTransform(t -> hForward, &LabOut1, Proof2, 1);
- cmsDoTransform(t -> hReverse, Proof2, &LabOut2, 1);
-
- // Take difference of direct value
- dE1 = cmsDeltaE(&LabIn1, &LabOut1);
-
- // Take difference of converted value
- dE2 = cmsDeltaE(&LabIn2, &LabOut2);
-
-
- // if dE1 is small and dE2 is small, value is likely to be in gamut
- if (dE1 < t->Thereshold && dE2 < t->Thereshold)
- Out[0] = 0;
- else {
-
- // if dE1 is small and dE2 is big, undefined. Assume in gamut
- if (dE1 < t->Thereshold && dE2 > t->Thereshold)
- Out[0] = 0;
- else
- // dE1 is big and dE2 is small, clearly out of gamut
- if (dE1 > t->Thereshold && dE2 < t->Thereshold)
- Out[0] = (cmsUInt16Number) _cmsQuickFloor((dE1 - t->Thereshold) + .5);
- else {
-
- // dE1 is big and dE2 is also big, could be due to perceptual mapping
- // so take error ratio
- if (dE2 == 0.0)
- ErrorRatio = dE1;
- else
- ErrorRatio = dE1 / dE2;
-
- if (ErrorRatio > t->Thereshold)
- Out[0] = (cmsUInt16Number) _cmsQuickFloor((ErrorRatio - t->Thereshold) + .5);
- else
- Out[0] = 0;
- }
- }
-
-
- return TRUE;
-}
-
-// Does compute a gamut LUT going back and forth across pcs -> relativ. colorimetric intent -> pcs
-// the dE obtained is then annotated on the LUT. Values truely out of gamut are clipped to dE = 0xFFFE
-// and values changed are supposed to be handled by any gamut remapping, so, are out of gamut as well.
-//
-// **WARNING: This algorithm does assume that gamut remapping algorithms does NOT move in-gamut colors,
-// of course, many perceptual and saturation intents does not work in such way, but relativ. ones should.
-
-cmsPipeline* _cmsCreateGamutCheckPipeline(cmsContext ContextID,
- cmsHPROFILE hProfiles[],
- cmsBool BPC[],
- cmsUInt32Number Intents[],
- cmsFloat64Number AdaptationStates[],
- cmsUInt32Number nGamutPCSposition,
- cmsHPROFILE hGamut)
-{
- cmsHPROFILE hLab;
- cmsPipeline* Gamut;
- cmsStage* CLUT;
- cmsUInt32Number dwFormat;
- GAMUTCHAIN Chain;
- int nChannels, nGridpoints;
- cmsColorSpaceSignature ColorSpace;
- cmsUInt32Number i;
- cmsHPROFILE ProfileList[256];
- cmsBool BPCList[256];
- cmsFloat64Number AdaptationList[256];
- cmsUInt32Number IntentList[256];
-
- memset(&Chain, 0, sizeof(GAMUTCHAIN));
-
-
- if (nGamutPCSposition <= 0 || nGamutPCSposition > 255) {
- cmsSignalError(ContextID, cmsERROR_RANGE, "Wrong position of PCS. 1..255 expected, %d found.", nGamutPCSposition);
- return NULL;
- }
-
- hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
- if (hLab == NULL) return NULL;
-
-
- // The figure of merit. On matrix-shaper profiles, should be almost zero as
- // the conversion is pretty exact. On LUT based profiles, different resolutions
- // of input and output CLUT may result in differences.
-
- if (cmsIsMatrixShaper(hGamut)) {
-
- Chain.Thereshold = 1.0;
- }
- else {
- Chain.Thereshold = ERR_THERESHOLD;
- }
-
-
- // Create a copy of parameters
- for (i=0; i < nGamutPCSposition; i++) {
- ProfileList[i] = hProfiles[i];
- BPCList[i] = BPC[i];
- AdaptationList[i] = AdaptationStates[i];
- IntentList[i] = Intents[i];
- }
-
- // Fill Lab identity
- ProfileList[nGamutPCSposition] = hLab;
- BPCList[nGamutPCSposition] = 0;
- AdaptationList[nGamutPCSposition] = 1.0;
- Intents[nGamutPCSposition] = INTENT_RELATIVE_COLORIMETRIC;
-
-
- ColorSpace = cmsGetColorSpace(hGamut);
-
- nChannels = cmsChannelsOf(ColorSpace);
- nGridpoints = _cmsReasonableGridpointsByColorspace(ColorSpace, cmsFLAGS_HIGHRESPRECALC);
- dwFormat = (CHANNELS_SH(nChannels)|BYTES_SH(2));
-
- // 16 bits to Lab double
- Chain.hInput = cmsCreateExtendedTransform(ContextID,
- nGamutPCSposition + 1,
- ProfileList,
- BPCList,
- Intents,
- AdaptationList,
- NULL, 0,
- dwFormat, TYPE_Lab_DBL,
- cmsFLAGS_NOCACHE);
-
-
- // Does create the forward step. Lab double to device
- dwFormat = (CHANNELS_SH(nChannels)|BYTES_SH(2));
- Chain.hForward = cmsCreateTransformTHR(ContextID,
- hLab, TYPE_Lab_DBL,
- hGamut, dwFormat,
- INTENT_RELATIVE_COLORIMETRIC,
- cmsFLAGS_NOCACHE);
-
- // Does create the backwards step
- Chain.hReverse = cmsCreateTransformTHR(ContextID, hGamut, dwFormat,
- hLab, TYPE_Lab_DBL,
- INTENT_RELATIVE_COLORIMETRIC,
- cmsFLAGS_NOCACHE);
-
-
- // All ok?
- if (Chain.hForward && Chain.hReverse) {
-
- // Go on, try to compute gamut LUT from PCS. This consist on a single channel containing
- // dE when doing a transform back and forth on the colorimetric intent.
-
- Gamut = cmsPipelineAlloc(ContextID, 3, 1);
-
- if (Gamut != NULL) {
-
- CLUT = cmsStageAllocCLut16bit(ContextID, nGridpoints, nChannels, 1, NULL);
- cmsPipelineInsertStage(Gamut, cmsAT_BEGIN, CLUT);
-
- cmsStageSampleCLut16bit(CLUT, GamutSampler, (void*) &Chain, 0);
- }
- }
- else
- Gamut = NULL; // Didn't work...
-
- // Free all needed stuff.
- if (Chain.hInput) cmsDeleteTransform(Chain.hInput);
- if (Chain.hForward) cmsDeleteTransform(Chain.hForward);
- if (Chain.hReverse) cmsDeleteTransform(Chain.hReverse);
- if (hLab) cmsCloseProfile(hLab);
-
- // And return computed hull
- return Gamut;
-}
-
-// Total Area Coverage estimation ----------------------------------------------------------------
-
-typedef struct {
- cmsUInt32Number nOutputChans;
- cmsHTRANSFORM hRoundTrip;
- cmsFloat32Number MaxTAC;
- cmsFloat32Number MaxInput[cmsMAXCHANNELS];
-
-} cmsTACestimator;
-
-
-// This callback just accounts the maximum ink dropped in the given node. It does not populate any
-// memory, as the destination table is NULL. Its only purpose it to know the global maximum.
-static
-int EstimateTAC(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void * Cargo)
-{
- cmsTACestimator* bp = (cmsTACestimator*) Cargo;
- cmsFloat32Number RoundTrip[cmsMAXCHANNELS];
- cmsUInt32Number i;
- cmsFloat32Number Sum;
-
-
- // Evaluate the xform
- cmsDoTransform(bp->hRoundTrip, In, RoundTrip, 1);
-
- // All all amounts of ink
- for (Sum=0, i=0; i < bp ->nOutputChans; i++)
- Sum += RoundTrip[i];
-
- // If above maximum, keep track of input values
- if (Sum > bp ->MaxTAC) {
-
- bp ->MaxTAC = Sum;
-
- for (i=0; i < bp ->nOutputChans; i++) {
- bp ->MaxInput[i] = In[i];
- }
- }
-
- return TRUE;
-
- cmsUNUSED_PARAMETER(Out);
-}
-
-
-// Detect Total area coverage of the profile
-cmsFloat64Number CMSEXPORT cmsDetectTAC(cmsHPROFILE hProfile)
-{
- cmsTACestimator bp;
- cmsUInt32Number dwFormatter;
- cmsUInt32Number GridPoints[MAX_INPUT_DIMENSIONS];
- cmsHPROFILE hLab;
- cmsContext ContextID = cmsGetProfileContextID(hProfile);
-
- // TAC only works on output profiles
- if (cmsGetDeviceClass(hProfile) != cmsSigOutputClass) {
- return 0;
- }
-
- // Create a fake formatter for result
- dwFormatter = cmsFormatterForColorspaceOfProfile(hProfile, 4, TRUE);
-
- bp.nOutputChans = T_CHANNELS(dwFormatter);
- bp.MaxTAC = 0; // Initial TAC is 0
-
- // for safety
- if (bp.nOutputChans >= cmsMAXCHANNELS) return 0;
-
- hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
- if (hLab == NULL) return 0;
- // Setup a roundtrip on perceptual intent in output profile for TAC estimation
- bp.hRoundTrip = cmsCreateTransformTHR(ContextID, hLab, TYPE_Lab_16,
- hProfile, dwFormatter, INTENT_PERCEPTUAL, cmsFLAGS_NOOPTIMIZE|cmsFLAGS_NOCACHE);
-
- cmsCloseProfile(hLab);
- if (bp.hRoundTrip == NULL) return 0;
-
- // For L* we only need black and white. For C* we need many points
- GridPoints[0] = 6;
- GridPoints[1] = 74;
- GridPoints[2] = 74;
-
-
- if (!cmsSliceSpace16(3, GridPoints, EstimateTAC, &bp)) {
- bp.MaxTAC = 0;
- }
-
- cmsDeleteTransform(bp.hRoundTrip);
-
- // Results in %
- return bp.MaxTAC;
-}
-
-
-// Carefully, clamp on CIELab space.
-
-cmsBool CMSEXPORT cmsDesaturateLab(cmsCIELab* Lab,
- double amax, double amin,
- double bmax, double bmin)
-{
-
- // Whole Luma surface to zero
-
- if (Lab -> L < 0) {
-
- Lab-> L = Lab->a = Lab-> b = 0.0;
- return FALSE;
- }
-
- // Clamp white, DISCARD HIGHLIGHTS. This is done
- // in such way because icc spec doesn't allow the
- // use of L>100 as a highlight means.
-
- if (Lab->L > 100)
- Lab -> L = 100;
-
- // Check out gamut prism, on a, b faces
-
- if (Lab -> a < amin || Lab->a > amax||
- Lab -> b < bmin || Lab->b > bmax) {
-
- cmsCIELCh LCh;
- double h, slope;
-
- // Falls outside a, b limits. Transports to LCh space,
- // and then do the clipping
-
-
- if (Lab -> a == 0.0) { // Is hue exactly 90?
-
- // atan will not work, so clamp here
- Lab -> b = Lab->b < 0 ? bmin : bmax;
- return TRUE;
- }
-
- cmsLab2LCh(&LCh, Lab);
-
- slope = Lab -> b / Lab -> a;
- h = LCh.h;
-
- // There are 4 zones
-
- if ((h >= 0. && h < 45.) ||
- (h >= 315 && h <= 360.)) {
-
- // clip by amax
- Lab -> a = amax;
- Lab -> b = amax * slope;
- }
- else
- if (h >= 45. && h < 135.)
- {
- // clip by bmax
- Lab -> b = bmax;
- Lab -> a = bmax / slope;
- }
- else
- if (h >= 135. && h < 225.) {
- // clip by amin
- Lab -> a = amin;
- Lab -> b = amin * slope;
-
- }
- else
- if (h >= 225. && h < 315.) {
- // clip by bmin
- Lab -> b = bmin;
- Lab -> a = bmin / slope;
- }
- else {
- cmsSignalError(0, cmsERROR_RANGE, "Invalid angle");
- return FALSE;
- }
-
- }
-
- return TRUE;
-}
+//---------------------------------------------------------------------------------
+//
+// Little Color Management System
+// Copyright (c) 1998-2010 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"
+
+
+// Auxiliar: append a Lab identity after the given sequence of profiles
+// and return the transform. Lab profile is closed, rest of profiles are kept open.
+cmsHTRANSFORM _cmsChain2Lab(cmsContext ContextID,
+ cmsUInt32Number nProfiles,
+ cmsUInt32Number InputFormat,
+ cmsUInt32Number OutputFormat,
+ const cmsUInt32Number Intents[],
+ const cmsHPROFILE hProfiles[],
+ const cmsBool BPC[],
+ const cmsFloat64Number AdaptationStates[],
+ cmsUInt32Number dwFlags)
+{
+ cmsHTRANSFORM xform;
+ cmsHPROFILE hLab;
+ cmsHPROFILE ProfileList[256];
+ cmsBool BPCList[256];
+ cmsFloat64Number AdaptationList[256];
+ cmsUInt32Number IntentList[256];
+ cmsUInt32Number i;
+
+ // This is a rather big number and there is no need of dynamic memory
+ // since we are adding a profile, 254 + 1 = 255 and this is the limit
+ if (nProfiles > 254) return NULL;
+
+ // The output space
+ hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
+ if (hLab == NULL) return NULL;
+
+ // Create a copy of parameters
+ for (i=0; i < nProfiles; i++) {
+
+ ProfileList[i] = hProfiles[i];
+ BPCList[i] = BPC[i];
+ AdaptationList[i] = AdaptationStates[i];
+ IntentList[i] = Intents[i];
+ }
+
+ // Place Lab identity at chain's end.
+ ProfileList[nProfiles] = hLab;
+ BPCList[nProfiles] = 0;
+ AdaptationList[nProfiles] = 1.0;
+ IntentList[nProfiles] = INTENT_RELATIVE_COLORIMETRIC;
+
+ // Create the transform
+ xform = cmsCreateExtendedTransform(ContextID, nProfiles + 1, ProfileList,
+ BPCList,
+ IntentList,
+ AdaptationList,
+ NULL, 0,
+ InputFormat,
+ OutputFormat,
+ dwFlags);
+
+ cmsCloseProfile(hLab);
+
+ return xform;
+}
+
+
+// Compute K -> L* relationship. Flags may include black point compensation. In this case,
+// the relationship is assumed from the profile with BPC to a black point zero.
+static
+cmsToneCurve* ComputeKToLstar(cmsContext ContextID,
+ cmsUInt32Number nPoints,
+ cmsUInt32Number nProfiles,
+ const cmsUInt32Number Intents[],
+ const cmsHPROFILE hProfiles[],
+ const cmsBool BPC[],
+ const cmsFloat64Number AdaptationStates[],
+ cmsUInt32Number dwFlags)
+{
+ cmsToneCurve* out = NULL;
+ cmsUInt32Number i;
+ cmsHTRANSFORM xform;
+ cmsCIELab Lab;
+ cmsFloat32Number cmyk[4];
+ cmsFloat32Number* SampledPoints;
+
+ xform = _cmsChain2Lab(ContextID, nProfiles, TYPE_CMYK_FLT, TYPE_Lab_DBL, Intents, hProfiles, BPC, AdaptationStates, dwFlags);
+ if (xform == NULL) return NULL;
+
+ SampledPoints = (cmsFloat32Number*) _cmsCalloc(ContextID, nPoints, sizeof(cmsFloat32Number));
+ if (SampledPoints == NULL) goto Error;
+
+ for (i=0; i < nPoints; i++) {
+
+ cmyk[0] = 0;
+ cmyk[1] = 0;
+ cmyk[2] = 0;
+ cmyk[3] = (cmsFloat32Number) ((i * 100.0) / (nPoints-1));
+
+ cmsDoTransform(xform, cmyk, &Lab, 1);
+ SampledPoints[i]= (cmsFloat32Number) (1.0 - Lab.L / 100.0); // Negate K for easier operation
+ }
+
+ out = cmsBuildTabulatedToneCurveFloat(ContextID, nPoints, SampledPoints);
+
+Error:
+
+ cmsDeleteTransform(xform);
+ if (SampledPoints) _cmsFree(ContextID, SampledPoints);
+
+ return out;
+}
+
+
+// Compute Black tone curve on a CMYK -> CMYK transform. This is done by
+// using the proof direction on both profiles to find K->L* relationship
+// then joining both curves. dwFlags may include black point compensation.
+cmsToneCurve* _cmsBuildKToneCurve(cmsContext ContextID,
+ cmsUInt32Number nPoints,
+ cmsUInt32Number nProfiles,
+ const cmsUInt32Number Intents[],
+ const cmsHPROFILE hProfiles[],
+ const cmsBool BPC[],
+ const cmsFloat64Number AdaptationStates[],
+ cmsUInt32Number dwFlags)
+{
+ cmsToneCurve *in, *out, *KTone;
+
+ // Make sure CMYK -> CMYK
+ if (cmsGetColorSpace(hProfiles[0]) != cmsSigCmykData ||
+ cmsGetColorSpace(hProfiles[nProfiles-1])!= cmsSigCmykData) return NULL;
+
+
+ // Make sure last is an output profile
+ if (cmsGetDeviceClass(hProfiles[nProfiles - 1]) != cmsSigOutputClass) return NULL;
+
+ // Create individual curves. BPC works also as each K to L* is
+ // computed as a BPC to zero black point in case of L*
+ in = ComputeKToLstar(ContextID, nPoints, nProfiles - 1, Intents, hProfiles, BPC, AdaptationStates, dwFlags);
+ if (in == NULL) return NULL;
+
+ out = ComputeKToLstar(ContextID, nPoints, 1,
+ Intents + (nProfiles - 1),
+ hProfiles + (nProfiles - 1),
+ BPC + (nProfiles - 1),
+ AdaptationStates + (nProfiles - 1),
+ dwFlags);
+ if (out == NULL) {
+ cmsFreeToneCurve(in);
+ return NULL;
+ }
+
+ // Build the relationship. This effectively limits the maximum accuracy to 16 bits, but
+ // since this is used on black-preserving LUTs, we are not loosing accuracy in any case
+ KTone = cmsJoinToneCurve(ContextID, in, out, nPoints);
+
+ // Get rid of components
+ cmsFreeToneCurve(in); cmsFreeToneCurve(out);
+
+ // Something went wrong...
+ if (KTone == NULL) return NULL;
+
+ // Make sure it is monotonic
+ if (!cmsIsToneCurveMonotonic(KTone)) {
+ cmsFreeToneCurve(KTone);
+ return NULL;
+ }
+
+ return KTone;
+}
+
+
+// Gamut LUT Creation -----------------------------------------------------------------------------------------
+
+// Used by gamut & softproofing
+
+typedef struct {
+
+ cmsHTRANSFORM hInput; // From whatever input color space. 16 bits to DBL
+ cmsHTRANSFORM hForward, hReverse; // Transforms going from Lab to colorant and back
+ cmsFloat64Number Thereshold; // The thereshold after which is considered out of gamut
+
+ } GAMUTCHAIN;
+
+// This sampler does compute gamut boundaries by comparing original
+// values with a transform going back and forth. Values above ERR_THERESHOLD
+// of maximum are considered out of gamut.
+
+#define ERR_THERESHOLD 5
+
+
+static
+int GamutSampler(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void* Cargo)
+{
+ GAMUTCHAIN* t = (GAMUTCHAIN* ) Cargo;
+ cmsCIELab LabIn1, LabOut1;
+ cmsCIELab LabIn2, LabOut2;
+ cmsUInt16Number Proof[cmsMAXCHANNELS], Proof2[cmsMAXCHANNELS];
+ cmsFloat64Number dE1, dE2, ErrorRatio;
+
+ // Assume in-gamut by default.
+ dE1 = 0.;
+ dE2 = 0;
+ ErrorRatio = 1.0;
+
+ // Convert input to Lab
+ if (t -> hInput != NULL)
+ cmsDoTransform(t -> hInput, In, &LabIn1, 1);
+
+ // converts from PCS to colorant. This always
+ // does return in-gamut values,
+ cmsDoTransform(t -> hForward, &LabIn1, Proof, 1);
+
+ // Now, do the inverse, from colorant to PCS.
+ cmsDoTransform(t -> hReverse, Proof, &LabOut1, 1);
+
+ memmove(&LabIn2, &LabOut1, sizeof(cmsCIELab));
+
+ // Try again, but this time taking Check as input
+ cmsDoTransform(t -> hForward, &LabOut1, Proof2, 1);
+ cmsDoTransform(t -> hReverse, Proof2, &LabOut2, 1);
+
+ // Take difference of direct value
+ dE1 = cmsDeltaE(&LabIn1, &LabOut1);
+
+ // Take difference of converted value
+ dE2 = cmsDeltaE(&LabIn2, &LabOut2);
+
+
+ // if dE1 is small and dE2 is small, value is likely to be in gamut
+ if (dE1 < t->Thereshold && dE2 < t->Thereshold)
+ Out[0] = 0;
+ else {
+
+ // if dE1 is small and dE2 is big, undefined. Assume in gamut
+ if (dE1 < t->Thereshold && dE2 > t->Thereshold)
+ Out[0] = 0;
+ else
+ // dE1 is big and dE2 is small, clearly out of gamut
+ if (dE1 > t->Thereshold && dE2 < t->Thereshold)
+ Out[0] = (cmsUInt16Number) _cmsQuickFloor((dE1 - t->Thereshold) + .5);
+ else {
+
+ // dE1 is big and dE2 is also big, could be due to perceptual mapping
+ // so take error ratio
+ if (dE2 == 0.0)
+ ErrorRatio = dE1;
+ else
+ ErrorRatio = dE1 / dE2;
+
+ if (ErrorRatio > t->Thereshold)
+ Out[0] = (cmsUInt16Number) _cmsQuickFloor((ErrorRatio - t->Thereshold) + .5);
+ else
+ Out[0] = 0;
+ }
+ }
+
+
+ return TRUE;
+}
+
+// Does compute a gamut LUT going back and forth across pcs -> relativ. colorimetric intent -> pcs
+// the dE obtained is then annotated on the LUT. Values truely out of gamut are clipped to dE = 0xFFFE
+// and values changed are supposed to be handled by any gamut remapping, so, are out of gamut as well.
+//
+// **WARNING: This algorithm does assume that gamut remapping algorithms does NOT move in-gamut colors,
+// of course, many perceptual and saturation intents does not work in such way, but relativ. ones should.
+
+cmsPipeline* _cmsCreateGamutCheckPipeline(cmsContext ContextID,
+ cmsHPROFILE hProfiles[],
+ cmsBool BPC[],
+ cmsUInt32Number Intents[],
+ cmsFloat64Number AdaptationStates[],
+ cmsUInt32Number nGamutPCSposition,
+ cmsHPROFILE hGamut)
+{
+ cmsHPROFILE hLab;
+ cmsPipeline* Gamut;
+ cmsStage* CLUT;
+ cmsUInt32Number dwFormat;
+ GAMUTCHAIN Chain;
+ int nChannels, nGridpoints;
+ cmsColorSpaceSignature ColorSpace;
+ cmsUInt32Number i;
+ cmsHPROFILE ProfileList[256];
+ cmsBool BPCList[256];
+ cmsFloat64Number AdaptationList[256];
+ cmsUInt32Number IntentList[256];
+
+ memset(&Chain, 0, sizeof(GAMUTCHAIN));
+
+
+ if (nGamutPCSposition <= 0 || nGamutPCSposition > 255) {
+ cmsSignalError(ContextID, cmsERROR_RANGE, "Wrong position of PCS. 1..255 expected, %d found.", nGamutPCSposition);
+ return NULL;
+ }
+
+ hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
+ if (hLab == NULL) return NULL;
+
+
+ // The figure of merit. On matrix-shaper profiles, should be almost zero as
+ // the conversion is pretty exact. On LUT based profiles, different resolutions
+ // of input and output CLUT may result in differences.
+
+ if (cmsIsMatrixShaper(hGamut)) {
+
+ Chain.Thereshold = 1.0;
+ }
+ else {
+ Chain.Thereshold = ERR_THERESHOLD;
+ }
+
+
+ // Create a copy of parameters
+ for (i=0; i < nGamutPCSposition; i++) {
+ ProfileList[i] = hProfiles[i];
+ BPCList[i] = BPC[i];
+ AdaptationList[i] = AdaptationStates[i];
+ IntentList[i] = Intents[i];
+ }
+
+ // Fill Lab identity
+ ProfileList[nGamutPCSposition] = hLab;
+ BPCList[nGamutPCSposition] = 0;
+ AdaptationList[nGamutPCSposition] = 1.0;
+ Intents[nGamutPCSposition] = INTENT_RELATIVE_COLORIMETRIC;
+
+
+ ColorSpace = cmsGetColorSpace(hGamut);
+
+ nChannels = cmsChannelsOf(ColorSpace);
+ nGridpoints = _cmsReasonableGridpointsByColorspace(ColorSpace, cmsFLAGS_HIGHRESPRECALC);
+ dwFormat = (CHANNELS_SH(nChannels)|BYTES_SH(2));
+
+ // 16 bits to Lab double
+ Chain.hInput = cmsCreateExtendedTransform(ContextID,
+ nGamutPCSposition + 1,
+ ProfileList,
+ BPCList,
+ Intents,
+ AdaptationList,
+ NULL, 0,
+ dwFormat, TYPE_Lab_DBL,
+ cmsFLAGS_NOCACHE);
+
+
+ // Does create the forward step. Lab double to device
+ dwFormat = (CHANNELS_SH(nChannels)|BYTES_SH(2));
+ Chain.hForward = cmsCreateTransformTHR(ContextID,
+ hLab, TYPE_Lab_DBL,
+ hGamut, dwFormat,
+ INTENT_RELATIVE_COLORIMETRIC,
+ cmsFLAGS_NOCACHE);
+
+ // Does create the backwards step
+ Chain.hReverse = cmsCreateTransformTHR(ContextID, hGamut, dwFormat,
+ hLab, TYPE_Lab_DBL,
+ INTENT_RELATIVE_COLORIMETRIC,
+ cmsFLAGS_NOCACHE);
+
+
+ // All ok?
+ if (Chain.hForward && Chain.hReverse) {
+
+ // Go on, try to compute gamut LUT from PCS. This consist on a single channel containing
+ // dE when doing a transform back and forth on the colorimetric intent.
+
+ Gamut = cmsPipelineAlloc(ContextID, 3, 1);
+
+ if (Gamut != NULL) {
+
+ CLUT = cmsStageAllocCLut16bit(ContextID, nGridpoints, nChannels, 1, NULL);
+ cmsPipelineInsertStage(Gamut, cmsAT_BEGIN, CLUT);
+
+ cmsStageSampleCLut16bit(CLUT, GamutSampler, (void*) &Chain, 0);
+ }
+ }
+ else
+ Gamut = NULL; // Didn't work...
+
+ // Free all needed stuff.
+ if (Chain.hInput) cmsDeleteTransform(Chain.hInput);
+ if (Chain.hForward) cmsDeleteTransform(Chain.hForward);
+ if (Chain.hReverse) cmsDeleteTransform(Chain.hReverse);
+ if (hLab) cmsCloseProfile(hLab);
+
+ // And return computed hull
+ return Gamut;
+}
+
+// Total Area Coverage estimation ----------------------------------------------------------------
+
+typedef struct {
+ cmsUInt32Number nOutputChans;
+ cmsHTRANSFORM hRoundTrip;
+ cmsFloat32Number MaxTAC;
+ cmsFloat32Number MaxInput[cmsMAXCHANNELS];
+
+} cmsTACestimator;
+
+
+// This callback just accounts the maximum ink dropped in the given node. It does not populate any
+// memory, as the destination table is NULL. Its only purpose it to know the global maximum.
+static
+int EstimateTAC(register const cmsUInt16Number In[], register cmsUInt16Number Out[], register void * Cargo)
+{
+ cmsTACestimator* bp = (cmsTACestimator*) Cargo;
+ cmsFloat32Number RoundTrip[cmsMAXCHANNELS];
+ cmsUInt32Number i;
+ cmsFloat32Number Sum;
+
+
+ // Evaluate the xform
+ cmsDoTransform(bp->hRoundTrip, In, RoundTrip, 1);
+
+ // All all amounts of ink
+ for (Sum=0, i=0; i < bp ->nOutputChans; i++)
+ Sum += RoundTrip[i];
+
+ // If above maximum, keep track of input values
+ if (Sum > bp ->MaxTAC) {
+
+ bp ->MaxTAC = Sum;
+
+ for (i=0; i < bp ->nOutputChans; i++) {
+ bp ->MaxInput[i] = In[i];
+ }
+ }
+
+ return TRUE;
+
+ cmsUNUSED_PARAMETER(Out);
+}
+
+
+// Detect Total area coverage of the profile
+cmsFloat64Number CMSEXPORT cmsDetectTAC(cmsHPROFILE hProfile)
+{
+ cmsTACestimator bp;
+ cmsUInt32Number dwFormatter;
+ cmsUInt32Number GridPoints[MAX_INPUT_DIMENSIONS];
+ cmsHPROFILE hLab;
+ cmsContext ContextID = cmsGetProfileContextID(hProfile);
+
+ // TAC only works on output profiles
+ if (cmsGetDeviceClass(hProfile) != cmsSigOutputClass) {
+ return 0;
+ }
+
+ // Create a fake formatter for result
+ dwFormatter = cmsFormatterForColorspaceOfProfile(hProfile, 4, TRUE);
+
+ bp.nOutputChans = T_CHANNELS(dwFormatter);
+ bp.MaxTAC = 0; // Initial TAC is 0
+
+ // for safety
+ if (bp.nOutputChans >= cmsMAXCHANNELS) return 0;
+
+ hLab = cmsCreateLab4ProfileTHR(ContextID, NULL);
+ if (hLab == NULL) return 0;
+ // Setup a roundtrip on perceptual intent in output profile for TAC estimation
+ bp.hRoundTrip = cmsCreateTransformTHR(ContextID, hLab, TYPE_Lab_16,
+ hProfile, dwFormatter, INTENT_PERCEPTUAL, cmsFLAGS_NOOPTIMIZE|cmsFLAGS_NOCACHE);
+
+ cmsCloseProfile(hLab);
+ if (bp.hRoundTrip == NULL) return 0;
+
+ // For L* we only need black and white. For C* we need many points
+ GridPoints[0] = 6;
+ GridPoints[1] = 74;
+ GridPoints[2] = 74;
+
+
+ if (!cmsSliceSpace16(3, GridPoints, EstimateTAC, &bp)) {
+ bp.MaxTAC = 0;
+ }
+
+ cmsDeleteTransform(bp.hRoundTrip);
+
+ // Results in %
+ return bp.MaxTAC;
+}
+
+
+// Carefully, clamp on CIELab space.
+
+cmsBool CMSEXPORT cmsDesaturateLab(cmsCIELab* Lab,
+ double amax, double amin,
+ double bmax, double bmin)
+{
+
+ // Whole Luma surface to zero
+
+ if (Lab -> L < 0) {
+
+ Lab-> L = Lab->a = Lab-> b = 0.0;
+ return FALSE;
+ }
+
+ // Clamp white, DISCARD HIGHLIGHTS. This is done
+ // in such way because icc spec doesn't allow the
+ // use of L>100 as a highlight means.
+
+ if (Lab->L > 100)
+ Lab -> L = 100;
+
+ // Check out gamut prism, on a, b faces
+
+ if (Lab -> a < amin || Lab->a > amax||
+ Lab -> b < bmin || Lab->b > bmax) {
+
+ cmsCIELCh LCh;
+ double h, slope;
+
+ // Falls outside a, b limits. Transports to LCh space,
+ // and then do the clipping
+
+
+ if (Lab -> a == 0.0) { // Is hue exactly 90?
+
+ // atan will not work, so clamp here
+ Lab -> b = Lab->b < 0 ? bmin : bmax;
+ return TRUE;
+ }
+
+ cmsLab2LCh(&LCh, Lab);
+
+ slope = Lab -> b / Lab -> a;
+ h = LCh.h;
+
+ // There are 4 zones
+
+ if ((h >= 0. && h < 45.) ||
+ (h >= 315 && h <= 360.)) {
+
+ // clip by amax
+ Lab -> a = amax;
+ Lab -> b = amax * slope;
+ }
+ else
+ if (h >= 45. && h < 135.)
+ {
+ // clip by bmax
+ Lab -> b = bmax;
+ Lab -> a = bmax / slope;
+ }
+ else
+ if (h >= 135. && h < 225.) {
+ // clip by amin
+ Lab -> a = amin;
+ Lab -> b = amin * slope;
+
+ }
+ else
+ if (h >= 225. && h < 315.) {
+ // clip by bmin
+ Lab -> b = bmin;
+ Lab -> a = bmin / slope;
+ }
+ else {
+ cmsSignalError(0, cmsERROR_RANGE, "Invalid angle");
+ return FALSE;
+ }
+
+ }
+
+ return TRUE;
+}
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