Pillow/_imagingcms.c

/*
 * pyCMS
 * a Python / PIL interface to the littleCMS ICC Color Management System
 * Copyright (C) 2002-2003 Kevin Cazabon
 * kevin@cazabon.com
 * http://www.cazabon.com
 * Adapted/reworked for PIL by Fredrik Lundh
 * Copyright (c) 2009 Fredrik Lundh
 * Updated to LCMS2
 * Copyright (c) 2013 Eric Soroos
 *
 * pyCMS home page:  http://www.cazabon.com/pyCMS
 * littleCMS home page:  http://www.littlecms.com
 * (littleCMS is Copyright (C) 1998-2001 Marti Maria)
 *
 * Originally released under LGPL.  Graciously donated to PIL in
 * March 2009, for distribution under the standard PIL license
 */

#define COPYRIGHTINFO "\
pyCMS\n\
a Python / PIL interface to the littleCMS ICC Color Management System\n\
Copyright (C) 2002-2003 Kevin Cazabon\n\
kevin@cazabon.com\n\
http://www.cazabon.com\n\
"

#include "Python.h"
#include "lcms2.h"
#include "Imaging.h"
#include "py3.h"

#define PYCMSVERSION "1.0.0 pil"

/* version history */

/*
  1.0.0 pil Integrating littleCMS2
  0.1.0 pil integration & refactoring
  0.0.2 alpha:  Minor updates, added interfaces to littleCMS features, Jan 6, 2003
  - fixed some memory holes in how transforms/profiles were created and passed back to Python
  due to improper destructor setup for PyCObjects
  - added buildProofTransformFromOpenProfiles() function
  - eliminated some code redundancy, centralizing several common tasks with internal functions

  0.0.1 alpha:  First public release Dec 26, 2002

*/

/* known to-do list with current version:

   Verify that PILmode->littleCMStype conversion in findLCMStype is correct for all 
   PIL modes (it probably isn't for the more obscure ones)

   Add support for creating custom RGB profiles on the fly
   Add support for checking presence of a specific tag in a profile
   Add support for other littleCMS features as required

*/

/*
  INTENT_PERCEPTUAL                 0
  INTENT_RELATIVE_COLORIMETRIC      1
  INTENT_SATURATION                 2
  INTENT_ABSOLUTE_COLORIMETRIC      3
*/

/* -------------------------------------------------------------------- */
/* wrapper classes */

/* a profile represents the ICC characteristics for a specific device */

typedef struct {
    PyObject_HEAD
    cmsHPROFILE profile;
} CmsProfileObject;

static PyTypeObject CmsProfile_Type;

#define CmsProfile_Check(op) (Py_TYPE(op) == &CmsProfile_Type)

static PyObject*
cms_profile_new(cmsHPROFILE profile)
{
    CmsProfileObject* self;

    self = PyObject_New(CmsProfileObject, &CmsProfile_Type);
    if (!self)
        return NULL;

    self->profile = profile;

    return (PyObject*) self;
}

static PyObject*
cms_profile_open(PyObject* self, PyObject* args)
{
    cmsHPROFILE hProfile;

    char* sProfile;
    if (!PyArg_ParseTuple(args, "s:profile_open", &sProfile))
        return NULL;

    hProfile = cmsOpenProfileFromFile(sProfile, "r");
    if (!hProfile) {
        PyErr_SetString(PyExc_IOError, "cannot open profile file");
        return NULL;
    }

    return cms_profile_new(hProfile);
}

static PyObject*
cms_profile_fromstring(PyObject* self, PyObject* args)
{
    cmsHPROFILE hProfile;

    char* pProfile;
    int nProfile;
#if PY_VERSION_HEX >= 0x03000000
    if (!PyArg_ParseTuple(args, "y#:profile_frombytes", &pProfile, &nProfile))
        return NULL;
#else
    if (!PyArg_ParseTuple(args, "s#:profile_fromstring", &pProfile, &nProfile))
        return NULL;
#endif

    hProfile = cmsOpenProfileFromMem(pProfile, nProfile);
    if (!hProfile) {
        PyErr_SetString(PyExc_IOError, "cannot open profile from string");
        return NULL;
    }

    return cms_profile_new(hProfile);
}

static PyObject*
cms_profile_tobytes(PyObject* self, PyObject* args)
{
    char *pProfile =NULL;
    cmsUInt32Number nProfile;
    PyObject* CmsProfile;

    cmsHPROFILE *profile;

    PyObject* ret;
    if (!PyArg_ParseTuple(args, "O", &CmsProfile)){
        return NULL;
    }

    profile = ((CmsProfileObject*)CmsProfile)->profile;

    if (!cmsSaveProfileToMem(profile, pProfile, &nProfile)) {
        PyErr_SetString(PyExc_IOError, "Could not determine profile size");
        return NULL;
    }

    pProfile = (char*)malloc(nProfile);
    if (!pProfile) {
        PyErr_SetString(PyExc_IOError, "Out of Memory");
        return NULL;
    }

    if (!cmsSaveProfileToMem(profile, pProfile, &nProfile)) {
        PyErr_SetString(PyExc_IOError, "Could not get profile");
        free(pProfile);
        return NULL;
    }

#if PY_VERSION_HEX >= 0x03000000
    ret = PyBytes_FromStringAndSize(pProfile, (Py_ssize_t)nProfile);
#else
    ret = PyString_FromStringAndSize(pProfile, (Py_ssize_t)nProfile);
#endif

    free(pProfile);
    return ret;
}

static void
cms_profile_dealloc(CmsProfileObject* self)
{
    (void) cmsCloseProfile(self->profile);
    PyObject_Del(self);
}

/* a transform represents the mapping between two profiles */

typedef struct {
    PyObject_HEAD
    char mode_in[8];
    char mode_out[8];
    cmsHTRANSFORM transform;
} CmsTransformObject;

static PyTypeObject CmsTransform_Type;

#define CmsTransform_Check(op) (Py_TYPE(op) == &CmsTransform_Type)

static PyObject*
cms_transform_new(cmsHTRANSFORM transform, char* mode_in, char* mode_out)
{
    CmsTransformObject* self;

    self = PyObject_New(CmsTransformObject, &CmsTransform_Type);
    if (!self)
        return NULL;

    self->transform = transform;

    strcpy(self->mode_in, mode_in);
    strcpy(self->mode_out, mode_out);

    return (PyObject*) self;
}

static void
cms_transform_dealloc(CmsTransformObject* self)
{
    cmsDeleteTransform(self->transform);
    PyObject_Del(self);
}

/* -------------------------------------------------------------------- */
/* internal functions */

static const char*
findICmode(cmsColorSpaceSignature cs)
{
    switch (cs) {
    case cmsSigXYZData: return "XYZ";
    case cmsSigLabData: return "LAB";
    case cmsSigLuvData: return "LUV";
    case cmsSigYCbCrData: return "YCbCr";
    case cmsSigYxyData: return "YXY";
    case cmsSigRgbData: return "RGB";
    case cmsSigGrayData: return "L";
    case cmsSigHsvData: return "HSV";
    case cmsSigHlsData: return "HLS";
    case cmsSigCmykData: return "CMYK";
    case cmsSigCmyData: return "CMY";
    default: return ""; /* other TBA */
    }
}

static cmsUInt32Number
findLCMStype(char* PILmode)
{
    if (strcmp(PILmode, "RGB") == 0) {
        return TYPE_RGBA_8;
    }
    else if (strcmp(PILmode, "RGBA") == 0) {
        return TYPE_RGBA_8;
    }
    else if (strcmp(PILmode, "RGBX") == 0) {
        return TYPE_RGBA_8;
    }
    else if (strcmp(PILmode, "RGBA;16B") == 0) {
        return TYPE_RGBA_16;
    }
    else if (strcmp(PILmode, "CMYK") == 0) {
        return TYPE_CMYK_8;
    }
    else if (strcmp(PILmode, "L") == 0) {
        return TYPE_GRAY_8;
    }
    else if (strcmp(PILmode, "L;16") == 0) {
        return TYPE_GRAY_16;
    }
    else if (strcmp(PILmode, "L;16B") == 0) {
        return TYPE_GRAY_16_SE;
    }
    else if (strcmp(PILmode, "YCCA") == 0) {
        return TYPE_YCbCr_8;
    }
    else if (strcmp(PILmode, "YCC") == 0) {
        return TYPE_YCbCr_8;
    }
    else if (strcmp(PILmode, "LAB") == 0) {
        // LabX equvalent like ALab, but not reversed -- no #define in lcms2
        return (COLORSPACE_SH(PT_LabV2)|CHANNELS_SH(3)|BYTES_SH(1)|EXTRA_SH(1));
    }

    else {
        /* take a wild guess... but you probably should fail instead. */
        return TYPE_GRAY_8; /* so there's no buffer overrun... */
    }
}

static int
pyCMSdoTransform(Imaging im, Imaging imOut, cmsHTRANSFORM hTransform)
{
    int i;

    if (im->xsize > imOut->xsize || im->ysize > imOut->ysize)
        return -1;

    Py_BEGIN_ALLOW_THREADS

    for (i = 0; i < im->ysize; i++)
        cmsDoTransform(hTransform, im->image[i], imOut->image[i], im->xsize);

    Py_END_ALLOW_THREADS

    return 0;
}

static cmsHTRANSFORM
_buildTransform(cmsHPROFILE hInputProfile, cmsHPROFILE hOutputProfile, char *sInMode, char *sOutMode, int iRenderingIntent, cmsUInt32Number cmsFLAGS)
{
    cmsHTRANSFORM hTransform;

    Py_BEGIN_ALLOW_THREADS

    /* create the transform */
    hTransform = cmsCreateTransform(hInputProfile,
                                    findLCMStype(sInMode),
                                    hOutputProfile,
                                    findLCMStype(sOutMode),
                                    iRenderingIntent, cmsFLAGS);

    Py_END_ALLOW_THREADS

    if (!hTransform)
        PyErr_SetString(PyExc_ValueError, "cannot build transform");

    return hTransform; /* if NULL, an exception is set */
}

static cmsHTRANSFORM
_buildProofTransform(cmsHPROFILE hInputProfile, cmsHPROFILE hOutputProfile, cmsHPROFILE hProofProfile, char *sInMode, char *sOutMode, int iRenderingIntent, int iProofIntent, cmsUInt32Number cmsFLAGS)
{
    cmsHTRANSFORM hTransform;

    Py_BEGIN_ALLOW_THREADS

    /* create the transform */
    hTransform =  cmsCreateProofingTransform(hInputProfile,
                                             findLCMStype(sInMode),
                                             hOutputProfile,
                                             findLCMStype(sOutMode),
                                             hProofProfile,
                                             iRenderingIntent,
                                             iProofIntent,
                                             cmsFLAGS);

    Py_END_ALLOW_THREADS

    if (!hTransform)
        PyErr_SetString(PyExc_ValueError, "cannot build proof transform");

    return hTransform; /* if NULL, an exception is set */
}

/* -------------------------------------------------------------------- */
/* Python callable functions */

static PyObject *
buildTransform(PyObject *self, PyObject *args) {
    CmsProfileObject *pInputProfile;
    CmsProfileObject *pOutputProfile;
    char *sInMode;
    char *sOutMode;
    int iRenderingIntent = 0;
    int cmsFLAGS = 0;

    cmsHTRANSFORM transform = NULL;

    if (!PyArg_ParseTuple(args, "O!O!ss|ii:buildTransform", &CmsProfile_Type, &pInputProfile, &CmsProfile_Type, &pOutputProfile, &sInMode, &sOutMode, &iRenderingIntent, &cmsFLAGS))
        return NULL;

    transform = _buildTransform(pInputProfile->profile, pOutputProfile->profile, sInMode, sOutMode, iRenderingIntent, cmsFLAGS);

    if (!transform)
        return NULL;

    return cms_transform_new(transform, sInMode, sOutMode);
}

static PyObject *
buildProofTransform(PyObject *self, PyObject *args)
{
    CmsProfileObject *pInputProfile;
    CmsProfileObject *pOutputProfile;
    CmsProfileObject *pProofProfile;
    char *sInMode;
    char *sOutMode;
    int iRenderingIntent = 0;
    int iProofIntent = 0;
    int cmsFLAGS = 0;

    cmsHTRANSFORM transform = NULL;

    if (!PyArg_ParseTuple(args, "O!O!O!ss|iii:buildProofTransform", &CmsProfile_Type, &pInputProfile, &CmsProfile_Type, &pOutputProfile, &CmsProfile_Type, &pProofProfile, &sInMode, &sOutMode, &iRenderingIntent, &iProofIntent, &cmsFLAGS))
        return NULL;

    transform = _buildProofTransform(pInputProfile->profile, pOutputProfile->profile, pProofProfile->profile, sInMode, sOutMode, iRenderingIntent, iProofIntent, cmsFLAGS);

    if (!transform)
        return NULL;

    return cms_transform_new(transform, sInMode, sOutMode);

}

static PyObject *
cms_transform_apply(CmsTransformObject *self, PyObject *args)
{
    Py_ssize_t idIn;
    Py_ssize_t idOut;
    Imaging im;
    Imaging imOut;

    int result;

    if (!PyArg_ParseTuple(args, "nn:apply", &idIn, &idOut))
        return NULL;

    im = (Imaging) idIn;
    imOut = (Imaging) idOut;

    result = pyCMSdoTransform(im, imOut, self->transform);

    return Py_BuildValue("i", result);
}

/* -------------------------------------------------------------------- */
/* Python-Callable On-The-Fly profile creation functions */

static PyObject *
createProfile(PyObject *self, PyObject *args)
{
    char *sColorSpace;
    cmsHPROFILE hProfile;
    cmsFloat64Number dColorTemp = 0.0;
    cmsCIExyY whitePoint;
    cmsBool result;

    if (!PyArg_ParseTuple(args, "s|d:createProfile", &sColorSpace, &dColorTemp))
        return NULL;

    if (strcmp(sColorSpace, "LAB") == 0) {
        if (dColorTemp > 0.0) {
            result = cmsWhitePointFromTemp(&whitePoint, dColorTemp);
            if (!result) {
                PyErr_SetString(PyExc_ValueError, "ERROR: Could not calculate white point from color temperature provided, must be float in degrees Kelvin");
                return NULL;
            }
            hProfile = cmsCreateLab2Profile(&whitePoint);
        } else {
            hProfile = cmsCreateLab2Profile(NULL);
        }
    }
    else if (strcmp(sColorSpace, "XYZ") == 0) {
        hProfile = cmsCreateXYZProfile();
    } 
    else if (strcmp(sColorSpace, "sRGB") == 0) {
        hProfile = cmsCreate_sRGBProfile();
    }
    else {
        hProfile = NULL;
    }

    if (!hProfile) {
        PyErr_SetString(PyExc_ValueError, "failed to create requested color space");
        return NULL;
    }

    return cms_profile_new(hProfile);
}

/* -------------------------------------------------------------------- */
/* profile methods */

static PyObject *
cms_profile_is_intent_supported(CmsProfileObject *self, PyObject *args)
{
    cmsBool result;

    int intent;
    int direction;
    if (!PyArg_ParseTuple(args, "ii:is_intent_supported", &intent, &direction))
        return NULL;

    result = cmsIsIntentSupported(self->profile, intent, direction);

    /* printf("cmsIsIntentSupported(%p, %d, %d) => %d\n", self->profile, intent, direction, result); */

    return PyInt_FromLong(result != 0);
}

#ifdef _WIN32
static PyObject *
cms_get_display_profile_win32(PyObject* self, PyObject* args)
{
    char filename[MAX_PATH];
    cmsUInt32Number filename_size;
    BOOL ok;

    int handle = 0;
    int is_dc = 0;
    if (!PyArg_ParseTuple(args, "|ii:get_display_profile", &handle, &is_dc))
        return NULL;

    filename_size = sizeof(filename);

    if (is_dc) {
        ok = GetICMProfile((HDC) handle, &filename_size, filename);
    } else {
        HDC dc = GetDC((HWND) handle);
        ok = GetICMProfile(dc, &filename_size, filename);
        ReleaseDC((HWND) handle, dc);
    }

    if (ok)
        return PyUnicode_FromStringAndSize(filename, filename_size-1);

    Py_INCREF(Py_None);
    return Py_None;
}
#endif

/* -------------------------------------------------------------------- */
/* Python interface setup */

static PyMethodDef pyCMSdll_methods[] = {

    {"profile_open", cms_profile_open, 1},
    {"profile_frombytes", cms_profile_fromstring, 1},
    {"profile_fromstring", cms_profile_fromstring, 1},
    {"profile_tobytes", cms_profile_tobytes, 1},

    /* profile and transform functions */
    {"buildTransform", buildTransform, 1},
    {"buildProofTransform", buildProofTransform, 1},
    {"createProfile", createProfile, 1},

    /* platform specific tools */
#ifdef _WIN32
    {"get_display_profile_win32", cms_get_display_profile_win32, 1},
#endif

    {NULL, NULL}
};

static struct PyMethodDef cms_profile_methods[] = {
    {"is_intent_supported", (PyCFunction) cms_profile_is_intent_supported, 1},
    {NULL, NULL} /* sentinel */
};

static PyObject*
_profile_getattr(CmsProfileObject* self, cmsInfoType field)
{
    // UNDONE -- check that I'm getting the right fields on these.
    // return PyUnicode_DecodeFSDefault(cmsTakeProductName(self->profile));
    //wchar_t buf[256]; -- UNDONE need wchar_t for unicode version. 
    char buf[256];
    cmsUInt32Number written;
    written =  cmsGetProfileInfoASCII(self->profile, 
                                      field,
                                      "en",
                                      "us",
                                      buf,
                                      256);
    if (written) {
        return PyUnicode_FromString(buf);
    }
    // UNDONE suppressing error here by sending back blank string. 
    return PyUnicode_FromString("");
}

static PyObject*
cms_profile_getattr_product_desc(CmsProfileObject* self, void* closure)
{    
    // description was Description != 'Copyright' || or  "%s - %s" (manufacturer, model) in 1.x
    return _profile_getattr(self, cmsInfoDescription);
}

/* use these four for the individual fields. 
 */
static PyObject*
cms_profile_getattr_product_description(CmsProfileObject* self, void* closure)
{    
    return _profile_getattr(self, cmsInfoDescription);
}

static PyObject*
cms_profile_getattr_product_model(CmsProfileObject* self, void* closure)
{    
    return _profile_getattr(self, cmsInfoModel);
}

static PyObject*
cms_profile_getattr_product_manufacturer(CmsProfileObject* self, void* closure)
{    
    return _profile_getattr(self, cmsInfoManufacturer);
}

static PyObject*
cms_profile_getattr_product_copyright(CmsProfileObject* self, void* closure)
{    
    return _profile_getattr(self, cmsInfoCopyright);
}

static PyObject*
cms_profile_getattr_rendering_intent(CmsProfileObject* self, void* closure)
{
    return PyInt_FromLong(cmsGetHeaderRenderingIntent(self->profile));
}

static PyObject*
cms_profile_getattr_pcs(CmsProfileObject* self, void* closure)
{
    return PyUnicode_DecodeFSDefault(findICmode(cmsGetPCS(self->profile)));
}

static PyObject*
cms_profile_getattr_color_space(CmsProfileObject* self, void* closure)
{
    return PyUnicode_DecodeFSDefault(findICmode(cmsGetColorSpace(self->profile)));
}

/* FIXME: add more properties (creation_datetime etc) */
static struct PyGetSetDef cms_profile_getsetters[] = {
    { "product_desc",       (getter) cms_profile_getattr_product_desc },
    { "product_description", (getter) cms_profile_getattr_product_description },
    { "product_manufacturer", (getter) cms_profile_getattr_product_manufacturer },
    { "product_model",      (getter) cms_profile_getattr_product_model },
    { "product_copyright",  (getter) cms_profile_getattr_product_copyright },
    { "rendering_intent",   (getter) cms_profile_getattr_rendering_intent },
    { "pcs",                (getter) cms_profile_getattr_pcs },
    { "color_space",        (getter) cms_profile_getattr_color_space },
    { NULL }
};

static PyTypeObject CmsProfile_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "CmsProfile", sizeof(CmsProfileObject), 0,
    /* methods */
    (destructor) cms_profile_dealloc, /*tp_dealloc*/
    0, /*tp_print*/
    0,                          /*tp_getattr*/
    0,                          /*tp_setattr*/
    0,                          /*tp_compare*/
    0,                          /*tp_repr*/
    0,                          /*tp_as_number */
    0,                          /*tp_as_sequence */
    0,                          /*tp_as_mapping */
    0,                          /*tp_hash*/
    0,                          /*tp_call*/
    0,                          /*tp_str*/
    0,                          /*tp_getattro*/
    0,                          /*tp_setattro*/
    0,                          /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT,         /*tp_flags*/
    0,                          /*tp_doc*/
    0,                          /*tp_traverse*/
    0,                          /*tp_clear*/
    0,                          /*tp_richcompare*/
    0,                          /*tp_weaklistoffset*/
    0,                          /*tp_iter*/
    0,                          /*tp_iternext*/
    cms_profile_methods,        /*tp_methods*/
    0,                          /*tp_members*/
    cms_profile_getsetters,     /*tp_getset*/
};

static struct PyMethodDef cms_transform_methods[] = {
    {"apply", (PyCFunction) cms_transform_apply, 1},
    {NULL, NULL} /* sentinel */
};

static PyObject*
cms_transform_getattr_inputMode(CmsTransformObject* self, void* closure)
{
    return PyUnicode_FromString(self->mode_in);
}

static PyObject*
cms_transform_getattr_outputMode(CmsTransformObject* self, void* closure)
{
    return PyUnicode_FromString(self->mode_out);
}

static struct PyGetSetDef cms_transform_getsetters[] = {
    { "inputMode",      (getter) cms_transform_getattr_inputMode },
    { "outputMode",     (getter) cms_transform_getattr_outputMode },
    { NULL }
};

static PyTypeObject CmsTransform_Type = {
    PyVarObject_HEAD_INIT(NULL, 0)
    "CmsTransform", sizeof(CmsTransformObject), 0,
    /* methods */
    (destructor) cms_transform_dealloc, /*tp_dealloc*/
    0, /*tp_print*/
    0,                          /*tp_getattr*/
    0,                          /*tp_setattr*/
    0,                          /*tp_compare*/
    0,                          /*tp_repr*/
    0,                          /*tp_as_number */
    0,                          /*tp_as_sequence */
    0,                          /*tp_as_mapping */
    0,                          /*tp_hash*/
    0,                          /*tp_call*/
    0,                          /*tp_str*/
    0,                          /*tp_getattro*/
    0,                          /*tp_setattro*/
    0,                          /*tp_as_buffer*/
    Py_TPFLAGS_DEFAULT,         /*tp_flags*/
    0,                          /*tp_doc*/
    0,                          /*tp_traverse*/
    0,                          /*tp_clear*/
    0,                          /*tp_richcompare*/
    0,                          /*tp_weaklistoffset*/
    0,                          /*tp_iter*/
    0,                          /*tp_iternext*/
    cms_transform_methods,      /*tp_methods*/
    0,                          /*tp_members*/
    cms_transform_getsetters,   /*tp_getset*/
};

static int
setup_module(PyObject* m) {
    PyObject *d;
    PyObject *v;

    d = PyModule_GetDict(m);

    /* Ready object types */
    PyType_Ready(&CmsProfile_Type);
    PyType_Ready(&CmsTransform_Type);

    d = PyModule_GetDict(m);

    v = PyUnicode_FromFormat("%d.%d", LCMS_VERSION / 100, LCMS_VERSION % 100);
    PyDict_SetItemString(d, "littlecms_version", v);

    return 0;
}

#if PY_VERSION_HEX >= 0x03000000
PyMODINIT_FUNC
PyInit__imagingcms(void) {
    PyObject* m;

    static PyModuleDef module_def = {
        PyModuleDef_HEAD_INIT,
        "_imagingcms",      /* m_name */
        NULL,               /* m_doc */
        -1,                 /* m_size */
        pyCMSdll_methods,   /* m_methods */
    };

    m = PyModule_Create(&module_def);

    if (setup_module(m) < 0)
        return NULL;

    return m;
}
#else
PyMODINIT_FUNC
init_imagingcms(void)
{
    PyObject *m = Py_InitModule("_imagingcms", pyCMSdll_methods);
    setup_module(m);
}
#endif