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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string>
+
+#include <lcms2.h>
+
+/* These libgimp includes are not needed here at all, but this is a
+ * convenient place to make sure the public libgimp headers are
+ * C++-clean. The C++ compiler will choke on stuff like naming
+ * a struct member or parameter "private".
+ */
+#include "libgimp/gimp.h"
+#include "libgimp/gimpui.h"
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpmodule/gimpmodule.h"
+#include "libgimpthumb/gimpthumb.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#if defined(__MINGW32__)
+#ifndef FLT_EPSILON
+#define FLT_EPSILON __FLT_EPSILON__
+#endif
+#ifndef DBL_EPSILON
+#define DBL_EPSILON __DBL_EPSILON__
+#endif
+#ifndef LDBL_EPSILON
+#define LDBL_EPSILON __LDBL_EPSILON__
+#endif
+#endif
+
+#include <ImfInputFile.h>
+#include <ImfChannelList.h>
+#include <ImfRgbaFile.h>
+#include <ImfRgbaYca.h>
+#include <ImfStandardAttributes.h>
+
+#include "exr-attribute-blob.h"
+#include "openexr-wrapper.h"
+
+using namespace Imf;
+using namespace Imf::RgbaYca;
+using namespace Imath;
+
+static bool XYZ_equal(cmsCIEXYZ *a, cmsCIEXYZ *b)
+{
+ static const double epsilon = 0.0001;
+ // Y is encoding the luminance, we normalize that for comparison
+ return fabs ((a->X / a->Y * b->Y) - b->X) < epsilon &&
+ fabs ((a->Y / a->Y * b->Y) - b->Y) < epsilon &&
+ fabs ((a->Z / a->Y * b->Y) - b->Z) < epsilon;
+}
+
+struct _EXRLoader
+{
+ _EXRLoader(const char* filename) :
+ refcount_(1),
+ file_(filename),
+ data_window_(file_.header().dataWindow()),
+ channels_(file_.header().channels())
+ {
+ const Channel* chan;
+
+ if (channels_.findChannel("R") ||
+ channels_.findChannel("G") ||
+ channels_.findChannel("B"))
+ {
+ format_string_ = "RGB";
+ image_type_ = IMAGE_TYPE_RGB;
+
+ if ((chan = channels_.findChannel("R")))
+ pt_ = chan->type;
+ else if ((chan = channels_.findChannel("G")))
+ pt_ = chan->type;
+ else
+ pt_ = channels_.findChannel("B")->type;
+ }
+ else if (channels_.findChannel("Y") &&
+ (channels_.findChannel("RY") ||
+ channels_.findChannel("BY")))
+ {
+ format_string_ = "RGB";
+ image_type_ = IMAGE_TYPE_RGB;
+
+ pt_ = channels_.findChannel("Y")->type;
+
+ // FIXME: no chroma handling for now.
+ throw;
+ }
+ else if (channels_.findChannel("Y"))
+ {
+ format_string_ = "Y";
+ image_type_ = IMAGE_TYPE_GRAY;
+
+ pt_ = channels_.findChannel("Y")->type;
+ }
+ else
+ {
+ throw;
+ }
+
+ if (channels_.findChannel("A"))
+ {
+ format_string_.append("A");
+ has_alpha_ = true;
+ }
+ else
+ {
+ has_alpha_ = false;
+ }
+
+ switch (pt_)
+ {
+ case UINT:
+ format_string_.append(" u32");
+ bpc_ = 4;
+ break;
+ case HALF:
+ format_string_.append(" half");
+ bpc_ = 2;
+ break;
+ case FLOAT:
+ default:
+ format_string_.append(" float");
+ bpc_ = 4;
+ }
+ }
+
+ int readPixelRow(char* pixels,
+ int bpp,
+ int row)
+ {
+ const int actual_row = data_window_.min.y + row;
+ FrameBuffer fb;
+ // This is necessary because OpenEXR expects the buffer to begin at
+ // (0, 0). Though it probably results in some unmapped address,
+ // hopefully OpenEXR will not make use of it. :/
+ char* base = pixels - (data_window_.min.x * bpp);
+
+ switch (image_type_)
+ {
+ case IMAGE_TYPE_GRAY:
+ fb.insert("Y", Slice(pt_, base, bpp, 0, 1, 1, 0.5));
+ if (hasAlpha())
+ {
+ fb.insert("A", Slice(pt_, base + bpc_, bpp, 0, 1, 1, 1.0));
+ }
+ break;
+
+ case IMAGE_TYPE_RGB:
+ default:
+ fb.insert("R", Slice(pt_, base + (bpc_ * 0), bpp, 0, 1, 1, 0.0));
+ fb.insert("G", Slice(pt_, base + (bpc_ * 1), bpp, 0, 1, 1, 0.0));
+ fb.insert("B", Slice(pt_, base + (bpc_ * 2), bpp, 0, 1, 1, 0.0));
+ if (hasAlpha())
+ {
+ fb.insert("A", Slice(pt_, base + (bpc_ * 3), bpp, 0, 1, 1, 1.0));
+ }
+ }
+
+ file_.setFrameBuffer(fb);
+ file_.readPixels(actual_row);
+
+ return 0;
+ }
+
+ int getWidth() const {
+ return data_window_.max.x - data_window_.min.x + 1;
+ }
+
+ int getHeight() const {
+ return data_window_.max.y - data_window_.min.y + 1;
+ }
+
+ EXRPrecision getPrecision() const {
+ EXRPrecision prec;
+
+ switch (pt_)
+ {
+ case UINT:
+ prec = PREC_UINT;
+ break;
+ case HALF:
+ prec = PREC_HALF;
+ break;
+ case FLOAT:
+ default:
+ prec = PREC_FLOAT;
+ }
+
+ return prec;
+ }
+
+ EXRImageType getImageType() const {
+ return image_type_;
+ }
+
+ int hasAlpha() const {
+ return has_alpha_ ? 1 : 0;
+ }
+
+ GimpColorProfile *getProfile() const {
+ Chromaticities chromaticities;
+ float whiteLuminance = 1.0;
+
+ GimpColorProfile *linear_srgb_profile;
+ cmsHPROFILE linear_srgb_lcms;
+
+ GimpColorProfile *profile;
+ cmsHPROFILE lcms_profile;
+
+ cmsCIEXYZ *gimp_r_XYZ, *gimp_g_XYZ, *gimp_b_XYZ, *gimp_w_XYZ;
+ cmsCIEXYZ exr_r_XYZ, exr_g_XYZ, exr_b_XYZ, exr_w_XYZ;
+
+ // get the color information from the EXR
+ if (hasChromaticities (file_.header ()))
+ chromaticities = Imf::chromaticities (file_.header ());
+ else
+ return NULL;
+
+ if (Imf::hasWhiteLuminance (file_.header ()))
+ whiteLuminance = Imf::whiteLuminance (file_.header ());
+ else
+ return NULL;
+
+#if 0
+ std::cout << "hasChromaticities: "
+ << hasChromaticities (file_.header ())
+ << std::endl;
+ std::cout << "hasWhiteLuminance: "
+ << hasWhiteLuminance (file_.header ())
+ << std::endl;
+ std::cout << whiteLuminance << std::endl;
+ std::cout << chromaticities.red << std::endl;
+ std::cout << chromaticities.green << std::endl;
+ std::cout << chromaticities.blue << std::endl;
+ std::cout << chromaticities.white << std::endl;
+ std::cout << std::endl;
+#endif
+
+ cmsCIExyY whitePoint = { chromaticities.white.x,
+ chromaticities.white.y,
+ whiteLuminance };
+ cmsCIExyYTRIPLE CameraPrimaries = { { chromaticities.red.x,
+ chromaticities.red.y,
+ whiteLuminance },
+ { chromaticities.green.x,
+ chromaticities.green.y,
+ whiteLuminance },
+ { chromaticities.blue.x,
+ chromaticities.blue.y,
+ whiteLuminance } };
+
+ // get the primaries + wp from GIMP's internal linear sRGB profile
+ linear_srgb_profile = gimp_color_profile_new_rgb_srgb_linear ();
+ linear_srgb_lcms = gimp_color_profile_get_lcms_profile (linear_srgb_profile);
+
+ gimp_r_XYZ = (cmsCIEXYZ *) cmsReadTag (linear_srgb_lcms, cmsSigRedColorantTag);
+ gimp_g_XYZ = (cmsCIEXYZ *) cmsReadTag (linear_srgb_lcms, cmsSigGreenColorantTag);
+ gimp_b_XYZ = (cmsCIEXYZ *) cmsReadTag (linear_srgb_lcms, cmsSigBlueColorantTag);
+ gimp_w_XYZ = (cmsCIEXYZ *) cmsReadTag (linear_srgb_lcms, cmsSigMediaWhitePointTag);
+
+ cmsxyY2XYZ(&exr_r_XYZ, &CameraPrimaries.Red);
+ cmsxyY2XYZ(&exr_g_XYZ, &CameraPrimaries.Green);
+ cmsxyY2XYZ(&exr_b_XYZ, &CameraPrimaries.Blue);
+ cmsxyY2XYZ(&exr_w_XYZ, &whitePoint);
+
+ // ... and check if the data stored in the EXR matches GIMP's internal profile
+ bool exr_is_linear_srgb = XYZ_equal (&exr_r_XYZ, gimp_r_XYZ) &&
+ XYZ_equal (&exr_g_XYZ, gimp_g_XYZ) &&
+ XYZ_equal (&exr_b_XYZ, gimp_b_XYZ) &&
+ XYZ_equal (&exr_w_XYZ, gimp_w_XYZ);
+
+ // using GIMP's linear sRGB profile allows to skip the conversion popup
+ if (exr_is_linear_srgb)
+ return linear_srgb_profile;
+
+ // nope, it's something else. Clean up and build a new profile
+ g_object_unref (linear_srgb_profile);
+
+ // TODO: maybe factor this out into libgimpcolor/gimpcolorprofile.h ?
+ double Parameters[2] = { 1.0, 0.0 };
+ cmsToneCurve *Gamma[3];
+ Gamma[0] = Gamma[1] = Gamma[2] = cmsBuildParametricToneCurve(0,
+ 1,
+ Parameters);
+ lcms_profile = cmsCreateRGBProfile (&whitePoint, &CameraPrimaries, Gamma);
+ cmsFreeToneCurve (Gamma[0]);
+ if (lcms_profile == NULL) return NULL;
+
+// cmsSetProfileVersion (lcms_profile, 2.1);
+ cmsMLU *mlu0 = cmsMLUalloc (NULL, 1);
+ cmsMLUsetASCII (mlu0, "en", "US", "(GIMP internal)");
+ cmsMLU *mlu1 = cmsMLUalloc(NULL, 1);
+ cmsMLUsetASCII (mlu1, "en", "US", "color profile from EXR chromaticities");
+ cmsMLU *mlu2 = cmsMLUalloc(NULL, 1);
+ cmsMLUsetASCII (mlu2, "en", "US", "color profile from EXR chromaticities");
+ cmsWriteTag (lcms_profile, cmsSigDeviceMfgDescTag, mlu0);
+ cmsWriteTag (lcms_profile, cmsSigDeviceModelDescTag, mlu1);
+ cmsWriteTag (lcms_profile, cmsSigProfileDescriptionTag, mlu2);
+ cmsMLUfree (mlu0);
+ cmsMLUfree (mlu1);
+ cmsMLUfree (mlu2);
+
+ profile = gimp_color_profile_new_from_lcms_profile (lcms_profile,
+ NULL);
+ cmsCloseProfile (lcms_profile);
+
+ return profile;
+ }
+
+ gchar *getComment() const {
+ char *result = NULL;
+ const Imf::StringAttribute *comment = file_.header().findTypedAttribute<Imf::StringAttribute>("comment");
+ if (comment)
+ result = g_strdup (comment->value().c_str());
+ return result;
+ }
+
+ guchar *getExif(guint *size) const {
+ guchar jpeg_exif[] = "Exif\0\0";
+ guchar *exif_data = NULL;
+ *size = 0;
+
+ const Imf::BlobAttribute *exif = file_.header().findTypedAttribute<Imf::BlobAttribute>("exif");
+
+ if (exif)
+ {
+ exif_data = (guchar *)(exif->value().data.get());
+ *size = exif->value().size;
+ // darktable appends a jpg-compatible exif00 string, so get rid of that again:
+ if ( ! memcmp (jpeg_exif, exif_data, sizeof(jpeg_exif)))
+ {
+ *size -= 6;
+ exif_data += 6;
+ }
+ }
+
+ return (guchar *)g_memdup (exif_data, *size);
+ }
+
+ guchar *getXmp(guint *size) const {
+ guchar *result = NULL;
+ *size = 0;
+ const Imf::StringAttribute *xmp = file_.header().findTypedAttribute<Imf::StringAttribute>("xmp");
+ if (xmp)
+ {
+ *size = xmp->value().size();
+ result = (guchar *) g_memdup (xmp->value().data(), *size);
+ }
+ return result;
+ }
+
+ size_t refcount_;
+ InputFile file_;
+ const Box2i data_window_;
+ const ChannelList& channels_;
+ PixelType pt_;
+ int bpc_;
+ EXRImageType image_type_;
+ bool has_alpha_;
+ std::string format_string_;
+};
+
+EXRLoader*
+exr_loader_new (const char *filename)
+{
+ EXRLoader* file;
+
+ // Don't let any exceptions propagate to the C layer.
+ try
+ {
+ Imf::BlobAttribute::registerAttributeType();
+ file = new EXRLoader(filename);
+ }
+ catch (...)
+ {
+ file = NULL;
+ }
+
+ return file;
+}
+
+EXRLoader*
+exr_loader_ref (EXRLoader *loader)
+{
+ ++loader->refcount_;
+ return loader;
+}
+
+void
+exr_loader_unref (EXRLoader *loader)
+{
+ if (--loader->refcount_ == 0)
+ {
+ delete loader;
+ }
+}
+
+int
+exr_loader_get_width (EXRLoader *loader)
+{
+ int width;
+ // Don't let any exceptions propagate to the C layer.
+ try
+ {
+ width = loader->getWidth();
+ }
+ catch (...)
+ {
+ width = -1;
+ }
+
+ return width;
+}
+
+int
+exr_loader_get_height (EXRLoader *loader)
+{
+ int height;
+ // Don't let any exceptions propagate to the C layer.
+ try
+ {
+ height = loader->getHeight();
+ }
+ catch (...)
+ {
+ height = -1;
+ }
+
+ return height;
+}
+
+EXRImageType
+exr_loader_get_image_type (EXRLoader *loader)
+{
+ // This does not throw.
+ return loader->getImageType();
+}
+
+EXRPrecision
+exr_loader_get_precision (EXRLoader *loader)
+{
+ // This does not throw.
+ return loader->getPrecision();
+}
+
+int
+exr_loader_has_alpha (EXRLoader *loader)
+{
+ // This does not throw.
+ return loader->hasAlpha();
+}
+
+GimpColorProfile *
+exr_loader_get_profile (EXRLoader *loader)
+{
+ return loader->getProfile ();
+}
+
+gchar *
+exr_loader_get_comment (EXRLoader *loader)
+{
+ return loader->getComment ();
+}
+
+guchar *
+exr_loader_get_exif (EXRLoader *loader,
+ guint *size)
+{
+ return loader->getExif (size);
+}
+
+guchar *
+exr_loader_get_xmp (EXRLoader *loader,
+ guint *size)
+{
+ return loader->getXmp (size);
+}
+
+int
+exr_loader_read_pixel_row (EXRLoader *loader,
+ char *pixels,
+ int bpp,
+ int row)
+{
+ int retval = -1;
+ // Don't let any exceptions propagate to the C layer.
+ try
+ {
+ retval = loader->readPixelRow(pixels, bpp, row);
+ }
+ catch (...)
+ {
+ retval = -1;
+ }
+
+ return retval;
+}
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