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// This file is available under and governed by the GNU General Public
// License version 2 only, as published by the Free Software Foundation.
// However, the following notice accompanied the original version of this
// file:
//
//
// Little cms
// Copyright (C) 1998-2007 Marti Maria
//
// 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 "lcms.h"
// ---------------------------------------------------------------------------------
static volatile int GlobalBlackPreservationStrategy = 0;
// Quantize a value 0 <= i < MaxSamples
WORD _cmsQuantizeVal(double i, int MaxSamples)
{
double x;
x = ((double) i * 65535.) / (double) (MaxSamples - 1);
return (WORD) floor(x + .5);
}
// Is a table linear?
int cmsIsLinear(WORD Table[], int nEntries)
{
register int i;
int diff;
for (i=0; i < nEntries; i++) {
diff = abs((int) Table[i] - (int) _cmsQuantizeVal(i, nEntries));
if (diff > 3)
return 0;
}
return 1;
}
// pow() restricted to integer
static
int ipow(int base, int exp)
{
int res = base;
while (--exp)
res *= base;
return res;
}
// Given n, 0<=n<=clut^dim, returns the colorant.
static
int ComponentOf(int n, int clut, int nColorant)
{
if (nColorant <= 0)
return (n % clut);
n /= ipow(clut, nColorant);
return (n % clut);
}
// This routine does a sweep on whole input space, and calls its callback
// function on knots. returns TRUE if all ok, FALSE otherwise.
LCMSBOOL LCMSEXPORT cmsSample3DGrid(LPLUT Lut, _cmsSAMPLER Sampler, LPVOID Cargo, DWORD dwFlags)
{
int i, t, nTotalPoints, Colorant, index;
WORD In[MAXCHANNELS], Out[MAXCHANNELS];
nTotalPoints = ipow(Lut->cLutPoints, Lut -> InputChan);
index = 0;
for (i = 0; i < nTotalPoints; i++) {
for (t=0; t < (int) Lut -> InputChan; t++) {
Colorant = ComponentOf(i, Lut -> cLutPoints, (Lut -> InputChan - t - 1 ));
In[t] = _cmsQuantizeVal(Colorant, Lut -> cLutPoints);
}
if (dwFlags & SAMPLER_HASTL1) {
for (t=0; t < (int) Lut -> InputChan; t++)
In[t] = cmsReverseLinearInterpLUT16(In[t],
Lut -> L1[t],
&Lut -> In16params);
}
for (t=0; t < (int) Lut -> OutputChan; t++)
Out[t] = Lut->T[index + t];
if (dwFlags & SAMPLER_HASTL2) {
for (t=0; t < (int) Lut -> OutputChan; t++)
Out[t] = cmsLinearInterpLUT16(Out[t],
Lut -> L2[t],
&Lut -> Out16params);
}
if (!Sampler(In, Out, Cargo))
return FALSE;
if (!(dwFlags & SAMPLER_INSPECT)) {
if (dwFlags & SAMPLER_HASTL2) {
for (t=0; t < (int) Lut -> OutputChan; t++)
Out[t] = cmsReverseLinearInterpLUT16(Out[t],
Lut -> L2[t],
&Lut -> Out16params);
}
for (t=0; t < (int) Lut -> OutputChan; t++)
Lut->T[index + t] = Out[t];
}
index += Lut -> OutputChan;
}
return TRUE;
}
// choose reasonable resolution
int _cmsReasonableGridpointsByColorspace(icColorSpaceSignature Colorspace, DWORD dwFlags)
{
int nChannels;
// Already specified?
if (dwFlags & 0x00FF0000) {
// Yes, grab'em
return (dwFlags >> 16) & 0xFF;
}
nChannels = _cmsChannelsOf(Colorspace);
// HighResPrecalc is maximum resolution
if (dwFlags & cmsFLAGS_HIGHRESPRECALC) {
if (nChannels > 4)
return 7; // 7 for Hifi
if (nChannels == 4) // 23 for CMYK
return 23;
return 49; // 49 for RGB and others
}
// LowResPrecal is stripped resolution
if (dwFlags & cmsFLAGS_LOWRESPRECALC) {
if (nChannels > 4)
return 6; // 6 for Hifi
if (nChannels == 1)
return 33; // For monochrome
return 17; // 17 for remaining
}
// Default values
if (nChannels > 4)
return 7; // 7 for Hifi
if (nChannels == 4)
return 17; // 17 for CMYK
return 33; // 33 for RGB
}
// Sampler implemented by another transform. This is a clean way to
// precalculate the devicelink 3D CLUT for almost any transform
static
int XFormSampler(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
cmsDoTransform((cmsHTRANSFORM) Cargo, In, Out, 1);
return TRUE;
}
// This routine does compute the devicelink CLUT containing whole
// transform. Handles any channel number.
LPLUT _cmsPrecalculateDeviceLink(cmsHTRANSFORM h, DWORD dwFlags)
{
_LPcmsTRANSFORM p = (_LPcmsTRANSFORM) h;
LPLUT Grid;
int nGridPoints;
DWORD dwFormatIn, dwFormatOut;
DWORD SaveFormatIn, SaveFormatOut;
int ChannelsIn, ChannelsOut;
LPLUT SaveGamutLUT;
// Remove any gamut checking
SaveGamutLUT = p ->Gamut;
p ->Gamut = NULL;
ChannelsIn = _cmsChannelsOf(p -> EntryColorSpace);
ChannelsOut = _cmsChannelsOf(p -> ExitColorSpace);
nGridPoints = _cmsReasonableGridpointsByColorspace(p -> EntryColorSpace, dwFlags);
Grid = cmsAllocLUT();
if (!Grid) return NULL;
Grid = cmsAlloc3DGrid(Grid, nGridPoints, ChannelsIn, ChannelsOut);
// Compute device link on 16-bit basis
dwFormatIn = (CHANNELS_SH(ChannelsIn)|BYTES_SH(2));
dwFormatOut = (CHANNELS_SH(ChannelsOut)|BYTES_SH(2));
SaveFormatIn = p ->InputFormat;
SaveFormatOut = p ->OutputFormat;
p -> InputFormat = dwFormatIn;
p -> OutputFormat = dwFormatOut;
p -> FromInput = _cmsIdentifyInputFormat(p, dwFormatIn);
p -> ToOutput = _cmsIdentifyOutputFormat(p, dwFormatOut);
// Fix gamut & gamma possible mismatches.
if (!(dwFlags & cmsFLAGS_NOPRELINEARIZATION)) {
cmsHTRANSFORM hOne[1];
hOne[0] = h;
_cmsComputePrelinearizationTablesFromXFORM(hOne, 1, Grid);
}
// Attention to this typecast! we can take the luxury to
// do this since cmsHTRANSFORM is only an alias to a pointer
// to the transform struct.
if (!cmsSample3DGrid(Grid, XFormSampler, (LPVOID) p, Grid -> wFlags)) {
cmsFreeLUT(Grid);
Grid = NULL;
}
p ->Gamut = SaveGamutLUT;
p ->InputFormat = SaveFormatIn;
p ->OutputFormat = SaveFormatOut;
return Grid;
}
// Sampler for Black-preserving CMYK->CMYK transforms
typedef struct {
cmsHTRANSFORM cmyk2cmyk;
cmsHTRANSFORM cmyk2Lab;
LPGAMMATABLE KTone;
L16PARAMS KToneParams;
LPLUT LabK2cmyk;
double MaxError;
cmsHTRANSFORM hRoundTrip;
int MaxTAC;
cmsHTRANSFORM hProofOutput;
} BPCARGO, *LPBPCARGO;
// Preserve black only if that is the only ink used
static
int BlackPreservingGrayOnlySampler(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
BPCARGO* bp = (LPBPCARGO) Cargo;
// If going across black only, keep black only
if (In[0] == 0 && In[1] == 0 && In[2] == 0) {
// TAC does not apply because it is black ink!
Out[0] = Out[1] = Out[2] = 0;
Out[3] = cmsLinearInterpLUT16(In[3], bp->KTone ->GammaTable, &bp->KToneParams);
return 1;
}
// Keep normal transform for other colors
cmsDoTransform(bp ->cmyk2cmyk, In, Out, 1);
return 1;
}
// Preserve all K plane.
static
int BlackPreservingSampler(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
WORD LabK[4];
double SumCMY, SumCMYK, Error;
cmsCIELab ColorimetricLab, BlackPreservingLab;
BPCARGO* bp = (LPBPCARGO) Cargo;
// Get the K across Tone curve
LabK[3] = cmsLinearInterpLUT16(In[3], bp->KTone ->GammaTable, &bp->KToneParams);
// If going across black only, keep black only
if (In[0] == 0 && In[1] == 0 && In[2] == 0) {
Out[0] = Out[1] = Out[2] = 0;
Out[3] = LabK[3];
return 1;
}
// Try the original transform, maybe K is already ok (valid on K=0)
cmsDoTransform(bp ->cmyk2cmyk, In, Out, 1);
if (Out[3] == LabK[3]) return 1;
// No, mesure and keep Lab measurement for further usage
cmsDoTransform(bp->hProofOutput, Out, &ColorimetricLab, 1);
// Is not black only and the transform doesn't keep black.
// Obtain the Lab of CMYK. After that we have Lab + K
cmsDoTransform(bp ->cmyk2Lab, In, LabK, 1);
// Obtain the corresponding CMY using reverse interpolation.
// As a seed, we use the colorimetric CMY
cmsEvalLUTreverse(bp ->LabK2cmyk, LabK, Out, Out);
// Estimate the error
cmsDoTransform(bp->hProofOutput, Out, &BlackPreservingLab, 1);
Error = cmsDeltaE(&ColorimetricLab, &BlackPreservingLab);
// Apply TAC if needed
SumCMY = Out[0] + Out[1] + Out[2];
SumCMYK = SumCMY + Out[3];
if (SumCMYK > bp ->MaxTAC) {
double Ratio = 1 - ((SumCMYK - bp->MaxTAC) / SumCMY);
if (Ratio < 0)
Ratio = 0;
Out[0] = (WORD) floor(Out[0] * Ratio + 0.5); // C
Out[1] = (WORD) floor(Out[1] * Ratio + 0.5); // M
Out[2] = (WORD) floor(Out[2] * Ratio + 0.5); // Y
}
return 1;
}
// Sample whole gamut to estimate maximum TAC
#ifdef _MSC_VER
#pragma warning(disable : 4100)
#endif
static
int EstimateTAC(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
BPCARGO* bp = (LPBPCARGO) Cargo;
WORD RoundTrip[4];
int Sum;
cmsDoTransform(bp->hRoundTrip, In, RoundTrip, 1);
Sum = RoundTrip[0] + RoundTrip[1] + RoundTrip[2] + RoundTrip[3];
if (Sum > bp ->MaxTAC)
bp ->MaxTAC = Sum;
return 1;
}
// Estimate the maximum error
static
int BlackPreservingEstimateErrorSampler(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
BPCARGO* bp = (LPBPCARGO) Cargo;
WORD ColorimetricOut[4];
cmsCIELab ColorimetricLab, BlackPreservingLab;
double Error;
if (In[0] == 0 && In[1] == 0 && In[2] == 0) return 1;
cmsDoTransform(bp->cmyk2cmyk, In, ColorimetricOut, 1);
cmsDoTransform(bp->hProofOutput, ColorimetricOut, &ColorimetricLab, 1);
cmsDoTransform(bp->hProofOutput, Out, &BlackPreservingLab, 1);
Error = cmsDeltaE(&ColorimetricLab, &BlackPreservingLab);
if (Error > bp ->MaxError)
bp ->MaxError = Error;
return 1;
}
// Setup the K preservation strategy
int LCMSEXPORT cmsSetCMYKPreservationStrategy(int n)
{
int OldVal = GlobalBlackPreservationStrategy;
if (n >= 0)
GlobalBlackPreservationStrategy = n;
return OldVal;
}
#pragma warning(disable: 4550)
// Get a pointer to callback on depending of strategy
static
_cmsSAMPLER _cmsGetBlackPreservationSampler(void)
{
switch (GlobalBlackPreservationStrategy) {
case 0: return BlackPreservingGrayOnlySampler;
default: return BlackPreservingSampler;
}
}
// This is the black-preserving devicelink generator
LPLUT _cmsPrecalculateBlackPreservingDeviceLink(cmsHTRANSFORM hCMYK2CMYK, DWORD dwFlags)
{
_LPcmsTRANSFORM p = (_LPcmsTRANSFORM) hCMYK2CMYK;
BPCARGO Cargo;
LPLUT Grid;
DWORD LocalFlags;
cmsHPROFILE hLab = cmsCreateLabProfile(NULL);
int nGridPoints;
icTagSignature Device2PCS[] = {icSigAToB0Tag, // Perceptual
icSigAToB1Tag, // Relative colorimetric
icSigAToB2Tag, // Saturation
icSigAToB1Tag }; // Absolute colorimetric
// (Relative/WhitePoint)
nGridPoints = _cmsReasonableGridpointsByColorspace(p -> EntryColorSpace, dwFlags);
// Get a copy of inteserting flags for this kind of xform
LocalFlags = cmsFLAGS_NOTPRECALC;
if (p -> dwOriginalFlags & cmsFLAGS_BLACKPOINTCOMPENSATION)
LocalFlags |= cmsFLAGS_BLACKPOINTCOMPENSATION;
// Fill in cargo struct
Cargo.cmyk2cmyk = hCMYK2CMYK;
// Compute tone curve.
Cargo.KTone = _cmsBuildKToneCurve(hCMYK2CMYK, 256);
if (Cargo.KTone == NULL) return NULL;
cmsCalcL16Params(Cargo.KTone ->nEntries, &Cargo.KToneParams);
// Create a CMYK->Lab "normal" transform on input, without K-preservation
Cargo.cmyk2Lab = cmsCreateTransform(p ->InputProfile, TYPE_CMYK_16,
hLab, TYPE_Lab_16, p->Intent, LocalFlags);
// We are going to use the reverse of proof direction
Cargo.LabK2cmyk = cmsReadICCLut(p->OutputProfile, Device2PCS[p->Intent]);
// Is there any table available?
if (Cargo.LabK2cmyk == NULL) {
Grid = NULL;
goto Cleanup;
}
// Setup a roundtrip on output profile for TAC estimation
Cargo.hRoundTrip = cmsCreateTransform(p ->OutputProfile, TYPE_CMYK_16,
p ->OutputProfile, TYPE_CMYK_16, p->Intent, cmsFLAGS_NOTPRECALC);
// Setup a proof CMYK->Lab on output
Cargo.hProofOutput = cmsCreateTransform(p ->OutputProfile, TYPE_CMYK_16,
hLab, TYPE_Lab_DBL, p->Intent, LocalFlags);
// Create an empty LUT for holding K-preserving xform
Grid = cmsAllocLUT();
if (!Grid) goto Cleanup;
Grid = cmsAlloc3DGrid(Grid, nGridPoints, 4, 4);
// Setup formatters
p -> FromInput = _cmsIdentifyInputFormat(p, TYPE_CMYK_16);
p -> ToOutput = _cmsIdentifyOutputFormat(p, TYPE_CMYK_16);
// Step #1, estimate TAC
Cargo.MaxTAC = 0;
if (!cmsSample3DGrid(Grid, EstimateTAC, (LPVOID) &Cargo, 0)) {
cmsFreeLUT(Grid);
Grid = NULL;
goto Cleanup;
}
// Step #2, compute approximation
if (!cmsSample3DGrid(Grid, _cmsGetBlackPreservationSampler(), (LPVOID) &Cargo, 0)) {
cmsFreeLUT(Grid);
Grid = NULL;
goto Cleanup;
}
// Step #3, estimate error
Cargo.MaxError = 0;
cmsSample3DGrid(Grid, BlackPreservingEstimateErrorSampler, (LPVOID) &Cargo, SAMPLER_INSPECT);
Cleanup:
if (Cargo.cmyk2Lab) cmsDeleteTransform(Cargo.cmyk2Lab);
if (Cargo.hRoundTrip) cmsDeleteTransform(Cargo.hRoundTrip);
if (Cargo.hProofOutput) cmsDeleteTransform(Cargo.hProofOutput);
if (hLab) cmsCloseProfile(hLab);
if (Cargo.KTone) cmsFreeGamma(Cargo.KTone);
if (Cargo.LabK2cmyk) cmsFreeLUT(Cargo.LabK2cmyk);
return Grid;
}
// Fix broken LUT. just to obtain other CMS compatibility
static
void PatchLUT(LPLUT Grid, WORD At[], WORD Value[],
int nChannelsOut, int nChannelsIn)
{
LPL16PARAMS p16 = &Grid -> CLut16params;
double px, py, pz, pw;
int x0, y0, z0, w0;
int i, index;
if (Grid ->wFlags & LUT_HASTL1) return; // There is a prelinearization
px = ((double) At[0] * (p16->Domain)) / 65535.0;
py = ((double) At[1] * (p16->Domain)) / 65535.0;
pz = ((double) At[2] * (p16->Domain)) / 65535.0;
pw = ((double) At[3] * (p16->Domain)) / 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; // Not on exact node
index = p16 -> opta4 * x0 +
p16 -> opta3 * y0 +
p16 -> opta2 * z0 +
p16 -> opta1 * w0;
}
else
if (nChannelsIn == 3) {
if (((px - x0) != 0) ||
((py - y0) != 0) ||
((pz - z0) != 0)) return; // Not on exact node
index = p16 -> opta3 * x0 +
p16 -> opta2 * y0 +
p16 -> opta1 * z0;
}
else
if (nChannelsIn == 1) {
if (((px - x0) != 0)) return; // Not on exact node
index = p16 -> opta1 * x0;
}
else {
cmsSignalError(LCMS_ERRC_ABORTED, "(internal) %d Channels are not supported on PatchLUT", nChannelsIn);
return;
}
for (i=0; i < nChannelsOut; i++)
Grid -> T[index + i] = Value[i];
}
LCMSBOOL _cmsFixWhiteMisalignment(_LPcmsTRANSFORM p)
{
WORD *WhitePointIn, *WhitePointOut, *BlackPointIn, *BlackPointOut;
int nOuts, nIns;
if (!p -> DeviceLink) return FALSE;
if (p ->Intent == INTENT_ABSOLUTE_COLORIMETRIC) return FALSE;
if ((p ->PreviewProfile != NULL) &&
(p ->ProofIntent == INTENT_ABSOLUTE_COLORIMETRIC)) return FALSE;
if (!_cmsEndPointsBySpace(p -> EntryColorSpace,
&WhitePointIn, &BlackPointIn, &nIns)) return FALSE;
if (!_cmsEndPointsBySpace(p -> ExitColorSpace,
&WhitePointOut, &BlackPointOut, &nOuts)) return FALSE;
// Fix white only
PatchLUT(p -> DeviceLink, WhitePointIn, WhitePointOut, nOuts, nIns);
// PatchLUT(p -> DeviceLink, BlackPointIn, BlackPointOut, nOuts, nIns);
return TRUE;
}