commit a3745d801d12c711356615bb311dcae18982a396
Author: Vincent Forest <vincent.forest@meso-star.com>
Date: Wed, 12 Sep 2018 13:59:21 +0200
First commit
Diffstat:
| A | COPYING | | | 674 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | README.md | | | 37 | +++++++++++++++++++++++++++++++++++++ |
| A | cmake/CMakeLists.txt | | | 72 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/htpp.c | | | 508 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
4 files changed, 1291 insertions(+), 0 deletions(-)
diff --git a/COPYING b/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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 <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.md b/README.md
@@ -0,0 +1,37 @@
+# High-Tune: Post-Process
+
+This program is used to post process HDR images saved in the CIE 1931 XYZ color
+space, as generated by the [HTRDR](https://gitlab.com/meso-star/htcp/) program.
+
+The input images are simple ASCII files where empty lines are ignored. The text
+behind the `#` char is considered as comments. The first valid line of the file
+must list 2 integers defining the width and the height of the image. Then, each
+subsequent line must list 3 floating point data, representing the X, Y and Z
+component of a pixel. The pixels are row major ordered, i.e. they are listed
+row by row.
+
+## How to build
+
+This program is compatible GNU/Linux 64-bits. It relies on the
+[CMake](http://www.cmake.org) and the
+[RCMake](https://gitlab.com/vaplv/rcmake/) packages to build. It also depends
+on the [RSys](https://gitlab.com/vaplv/rsys/) library and on the
+[OpenMP](http://www.openmp.org) 1.2 specification to parallelize its
+computations.
+
+First ensure that CMake is installed on your system. Then install the RCMake
+package as well as the aforementioned prerequisites. Finally, generate the
+project from the `cmake/CMakeLists.txt` file by appending to the
+`CMAKE_PREFIX_PATH` variable the install directories of its dependencies. The
+resulting project can be edited, built, tested and installed as any CMake
+project. Refer to the [CMake](https://cmake.org/documentation) for further
+informations on CMake.
+
+## License
+
+htpp is a free software copyright (C) 2018 Université Paul Sabatier
+<contact-edstar@laplace.univ-tlse.fr>, |Meso|Star <contact@meso-star.com>. It
+is released under the GPL v3+ license: GNU GPL version 3 or later. You are
+welcome to redistribute it under certain conditions; refer to the COPYING file
+for details.
+
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
@@ -0,0 +1,72 @@
+# Copyright (C) 2018 Université Paul Sabatier, |Meso|Star>
+#
+# 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 <http://www.gnu.org/licenses/>.
+
+cmake_minimum_required(VERSION 2.8)
+project(htpp C)
+
+set(HTPP_SOURCE_DIR ${PROJECT_SOURCE_DIR}/../src)
+
+################################################################################
+# Check dependencies
+################################################################################
+find_package(RCMake 0.3 REQUIRED)
+find_package(RSys 0.6 REQUIRED)
+find_package(OpenMP 1.2 REQUIRED)
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${RCMAKE_SOURCE_DIR})
+include(rcmake)
+include(rcmake_runtime)
+
+include_directories(${RSys_INCLUDE_DIR})
+
+################################################################################
+# Configure and define targets
+################################################################################
+set(VERSION_MAJOR 0)
+set(VERSION_MINOR 0)
+set(VERSION_PATCH 0)
+set(VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH})
+
+set(HTPP_FILES_SRC htpp.c)
+set(HTPP_FILES_DOC COPYING README.md)
+
+# Prepend each file in the `HTPP_FILES_<SRC|INC>' list by `HTPP_SOURCE_DIR'
+rcmake_prepend_path(HTPP_FILES_SRC ${HTPP_SOURCE_DIR})
+rcmake_prepend_path(HTPP_FILES_DOC ${PROJECT_SOURCE_DIR}/../)
+
+add_executable(htpp ${HTPP_FILES_SRC})
+target_link_libraries(htpp RSys)
+
+set_target_properties(htpp PROPERTIES COMPILE_FLAGS "${OpenMP_C_FLAGS}")
+
+if(CMAKE_COMPILER_IS_GNUCC)
+ target_link_libraries(htpp m)
+ set_target_properties(htpp PROPERTIES LINK_FLAGS "${OpenMP_C_FLAGS}")
+endif()
+
+set_target_properties(htpp PROPERTIES
+ COMPILE_FLAGS "${OpenMP_C_FLAGS}"
+ VERSION ${VERSION}
+ SOVERSION ${VERSION_MAJOR})
+
+################################################################################
+# Define output & install directories
+################################################################################
+install(TARGETS htpp
+ ARCHIVE DESTINATION bin
+ LIBRARY DESTINATION lib
+ RUNTIME DESTINATION bin)
+install(FILES ${HTPP_FILES_DOC} DESTINATION share/doc/htpp)
+
diff --git a/src/htpp.c b/src/htpp.c
@@ -0,0 +1,508 @@
+/* Copyright (C) 2018 Université Paul Sabatier, |Meso|Star>
+ *
+ * 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 <http://www.gnu.org/licenses/>. */
+
+#define _POSIX_C_SOURCE 200112L /* getopt/close support */
+
+#include <rsys/cstr.h>
+#include <rsys/double33.h>
+#include <rsys/mem_allocator.h>
+#include <rsys/stretchy_array.h>
+#include <rsys/rsys.h>
+
+#include <errno.h>
+#include <fcntl.h> /* open */
+#include <omp.h>
+#include <string.h>
+#include <sys/stat.h> /* S_IRUSR & S_IWUSR */
+#include <unistd.h> /* getopt */
+
+struct args {
+ const char* input;
+ const char* output;
+ double exposure;
+ int force_overwrite;
+ int quit;
+};
+#define ARGS_DEFAULT__ {NULL,NULL,1.0,0,0}
+static const struct args ARGS_DEFAULT = ARGS_DEFAULT__;
+
+struct img {
+ char* pixels; /* row majored pixels */
+ size_t width;
+ size_t height;
+ size_t pitch; /* #bytes of a row */
+
+ double Yrange[2]; /* Luminance range */
+};
+#define IMG_NULL__ {NULL,0,0,0,{0,0}}
+static const struct img IMG_NULL = IMG_NULL__;
+
+/*******************************************************************************
+ * Helper functions
+ ******************************************************************************/
+static void
+print_help(const char* cmd)
+{
+ ASSERT(cmd);
+
+ printf(
+"Usage: %s [OPTIONS] [INPUT]\n"
+"Post process an XYZ ASCII image.\n\n", cmd);
+ printf(
+" -e EXPOSURE exposure of the pixel. Default value is 1.\n");
+ printf(
+" -f overwrite the OUTPUT file if it already exists.\n");
+ printf(
+" -h display this help and exit.\n");
+ printf(
+" -o OUTPUT write PPM image to OUTPUT. If not defined, write results\n"
+" to standard output.\n");
+ printf("\n");
+ printf(
+"%s (C) 2018 |Meso|Star>. This is free software released under the GNU GPL\n"
+"license, version 3 or later. You are free to change or redistribute it under\n"
+"certain conditions <http://gnu.org/licenses/gpl.html>.\n", cmd);
+}
+
+static void
+args_release(struct args* args)
+{
+ ASSERT(args);
+ *args = ARGS_DEFAULT;
+}
+
+static res_T
+args_init(struct args* args, const int argc, char** argv)
+{
+ int opt;
+ res_T res = RES_OK;
+ ASSERT(args && argc && argv);
+
+ while((opt = getopt(argc, argv, "e:fho:")) != -1) {
+ switch(opt) {
+ case 'e': res = cstr_to_double(optarg, &args->exposure); break;
+ case 'f': args->force_overwrite = 1; break;
+ case 'h':
+ print_help(argv[0]);
+ args_release(args);
+ args->quit = 1;
+ goto exit;
+ case 'o': args->output = optarg; break;
+ default: res = RES_BAD_ARG; break;
+ }
+ if(res != RES_OK) {
+ if(optarg) {
+ fprintf(stderr, "%s: invalid option argument '%s' -- '%c'\n",
+ argv[0], optarg, opt);
+ }
+ goto error;
+ }
+ }
+
+ if(optind < argc) {
+ args->input = argv[optind];
+ }
+
+exit:
+ optind = 1;
+ return res;
+error:
+ args_release(args);
+ goto exit;
+}
+
+static res_T
+open_output_stream(const char* path, const int force_overwrite, FILE** stream)
+{
+ int fd = -1;
+ FILE* fp = NULL;
+ res_T res = RES_OK;
+ ASSERT(path && stream);
+
+ if(force_overwrite) {
+ fp = fopen(path, "w");
+ if(!fp) {
+ fprintf(stderr, "Could not open the output file '%s' -- %s.\n",
+ path, strerror(errno));
+ goto error;
+ }
+ } else {
+ fd = open(path, O_CREAT|O_WRONLY|O_EXCL|O_TRUNC, S_IRUSR|S_IWUSR);
+ if(fd >= 0) {
+ fp = fdopen(fd, "w");
+ if(fp == NULL) {
+ fprintf(stderr, "Could not open the output file '%s' -- %s.\n",
+ path, strerror(errno));
+ goto error;
+ }
+ } else if(errno == EEXIST) {
+ fprintf(stderr,
+ "The output file '%s' already exists. Use -f to overwrite it.\n", path);
+ goto error;
+ } else {
+ fprintf(stderr,
+ "Unexpected error while opening the output file `'%s' -- %s.\n",
+ path, strerror(errno));
+ goto error;
+ }
+ }
+
+exit:
+ *stream = fp;
+ return res;
+error:
+ res = RES_IO_ERR;
+ if(fp) {
+ CHK(fclose(fp) == 0);
+ fp = NULL;
+ } else if(fd >= 0) {
+ CHK(close(fd) == 0);
+ }
+ goto exit;
+}
+
+static res_T
+open_input_stream(const char* path, FILE** stream)
+{
+ FILE* fp = NULL;
+ res_T res = RES_OK;
+ ASSERT(path && stream);
+
+ fp = fopen(path, "r");
+ if(!fp) {
+ fprintf(stderr, "Could not open the input file '%s' -- %s.\n",
+ path, strerror(errno));
+ res = RES_IO_ERR;
+ goto error;
+ }
+
+exit:
+ *stream = fp;
+ return res;
+error:
+ if(fp) fclose(fp);
+ goto exit;
+}
+
+static double*
+tone_mapping(double pixel[3])
+{
+ const double A = 0.15;
+ const double B = 0.50;
+ const double C = 0.10;
+ const double D = 0.20;
+ const double E = 0.02;
+ const double F = 0.30;
+ const double W = 11.2;
+ #define TONE_MAP(X) ((((X)*(A*(X)+C*B)+D*E)/((X)*(A*(X)+B)+D*F))-E/F)
+ const double white_scale = TONE_MAP(W);
+ ASSERT(pixel);
+
+ pixel[0] = TONE_MAP(pixel[0]) * white_scale;
+ pixel[1] = TONE_MAP(pixel[1]) * white_scale;
+ pixel[2] = TONE_MAP(pixel[2]) * white_scale;
+ #undef TONE_MAP
+ return pixel;
+}
+
+static double*
+XYZ_to_RGB(double XYZ[3])
+{
+ const double mat[9] = { /* D65 */
+ 3.2404542, -0.9692660, 0.0556434,
+ -1.5371385, 1.8760108, -0.2040259,
+ -0.4985314, 0.0415560, 1.0572252
+ };
+ double* RGB = XYZ;
+ ASSERT(XYZ);
+ d33_muld3(RGB, mat, XYZ);
+ RGB[0] = MMAX(RGB[0], 0);
+ RGB[1] = MMAX(RGB[1], 0);
+ RGB[2] = MMAX(RGB[2], 0);
+ return RGB;
+}
+
+static double*
+RGB_to_sRGB(double RGB[3])
+{
+ double* sRGB = RGB;
+ int i;
+ FOR_EACH(i, 0, 3) {
+ if(RGB[i] <= 0.0031308) {
+ sRGB[i] = RGB[i] * 12.92;
+ } else {
+ sRGB[i] = 1.055 * pow(RGB[i], 1.0/2.4);
+ }
+ }
+ return sRGB;
+}
+
+static FINLINE char*
+read_line(char** buf, FILE* stream)
+{
+ char* b = *buf;
+ const int chunk = 128;
+ ASSERT(buf);
+ if(!b) b = sa_add(b, 128);
+
+ do {
+ if(!fgets(b, (int)sa_size(b), stream)) return NULL;
+
+ /* Ensure that he whole line is read */
+ while(!strrchr(b, '\n') && !feof(stream)) {
+ CHK(fgets(sa_add(b, (size_t)chunk)-1/*'\0' char*/, chunk+1, stream));
+ }
+
+ b[strcspn(b, "#\n\r")] = '\0'; /* Rm new line & comments */
+ } while(strspn(b, " \t") == strlen(b)); /* Empty line */
+ *buf = b;
+ return b;
+}
+
+static void
+img_release(struct img* img)
+{
+ ASSERT(img);
+ if(img->pixels) mem_rm(img->pixels);
+}
+
+static res_T
+img_load(struct img* img, FILE* stream, const char* stream_name)
+{
+ char* b = NULL; /* Temporary buffer used to read the stream */
+ size_t x, y;
+ unsigned definition[2];
+ res_T res = RES_OK;
+ ASSERT(img && stream);
+
+ memset(img, 0, sizeof(*img));
+
+ if(!read_line(&b, stream)) {
+ fprintf(stderr, "%s: could not read the image definition.\n",
+ stream_name);
+ res = RES_IO_ERR;
+ goto error;
+ }
+
+ if(cstr_to_list_uint(b, ' ', definition, NULL, 2) != RES_OK) {
+ fprintf(stderr, "%s: invalid image definition '%s'\n",
+ stream_name, b) ;
+ res = RES_BAD_ARG;
+ goto error;
+ }
+
+ img->width = (size_t)definition[0];
+ img->height = (size_t)definition[1];
+ img->pitch = ALIGN_SIZE(sizeof(double[3])*img->width, 16u);
+
+ img->pixels = mem_alloc(img->pitch * img->height);
+ if(!img->pixels) {
+ fprintf(stderr, "Could not allocate the image pixels.\n");
+ res = RES_MEM_ERR;
+ goto error;
+ }
+
+ /* Read pixels and compute the luminance range of the image */
+ img->Yrange[0] = DBL_MAX;
+ img->Yrange[1] =-DBL_MAX;
+ FOR_EACH(y, 0, img->height) {
+ double* row = (double*)(img->pixels + y*img->pitch);
+ FOR_EACH(x, 0, img->width) {
+ double* pixel = row + x*3;
+ if(!read_line(&b, stream)) {
+ fprintf(stderr,
+ "%s: could not read the XYZ value of the (%lu, %lu) pixel.\n",
+ stream_name, (unsigned long)x, (unsigned long)y);
+ res = RES_IO_ERR;
+ goto error;
+ }
+ if(cstr_to_list_double(b, ' ', pixel, 0, 3) != RES_OK) {
+ fprintf(stderr, "%s: invalid XYZ value for the (%lu, %lu) pixel.\n",
+ stream_name, (unsigned long)x, (unsigned long)y);
+ res = RES_BAD_ARG;
+ goto error;
+ }
+ img->Yrange[0] = MMIN(img->Yrange[0], pixel[1]);
+ img->Yrange[1] = MMAX(img->Yrange[1], pixel[1]);
+ }
+ }
+exit:
+ if(b) sa_release(b);
+ return res;
+error:
+ img_release(img);
+ goto exit;
+}
+
+static res_T
+img_write_ppm(const struct img* img, FILE* stream, const char* stream_name)
+{
+ size_t x, y;
+ int i;
+ res_T res = RES_OK;
+ ASSERT(img && stream && stream_name);
+
+ /* Write LDR image */
+ i = fprintf(stream, "P3 %lu %lu\n255\n",
+ (unsigned long)img->width, (unsigned long)img->height);
+ if(i < 0) {
+ fprintf(stderr, "%s: could not write the PPM header.\n", stream_name);
+ res = RES_IO_ERR;
+ goto error;
+ }
+ FOR_EACH(y, 0, img->height) {
+ const double* row = (double*)(img->pixels + y*img->pitch);
+ FOR_EACH(x, 0, img->width) {
+ const double* pixel = row + x*3;
+ i = fprintf(stream, "%i %i %i\n",
+ (uint8_t)(CLAMP(pixel[0], 0.0, 1.0) * 255.0 + 0.5/*Round*/),
+ (uint8_t)(CLAMP(pixel[1], 0.0, 1.0) * 255.0 + 0.5/*Round*/),
+ (uint8_t)(CLAMP(pixel[2], 0.0, 1.0) * 255.0 + 0.5/*Round*/));
+ if(i < 0) {
+ fprintf(stderr, "%s: could not write the (%lu, %lu) pixel.\n",
+ stream_name, (unsigned long)x, (unsigned long)y);
+ res = RES_IO_ERR;
+ goto error;
+ }
+ }
+ }
+
+exit:
+ return res;
+error:
+ goto exit;
+}
+
+static double
+compute_img_normalization_factor(const struct img* img)
+{
+ size_t histo[16] = {0};
+ const size_t histo_len = sizeof(histo) / sizeof(histo[0]);
+ double Yscale;
+ double Ymax;
+ double Ydelta;
+ double rcp_npixels;
+ size_t i, x, y;
+ ASSERT(img);
+
+ /* Use nextarfter on the Luminance range to prevent a normalized luminance
+ * equal to 1, i.e. to prevent an histogram index equal to histo_len. */
+ Yscale = 1.0 / nextafter(img->Yrange[1] - img->Yrange[0], DBL_MAX);
+
+ /* Build the histo */
+ FOR_EACH(y, 0, img->height) {
+ const double* row = (double*)(img->pixels + y*img->pitch);
+ FOR_EACH(x, 0, img->width) {
+ const double* pixel = row + x*3;
+ const double Y = pixel[1];
+ const double Ynormalized = (Y - img->Yrange[0]) * Yscale;
+ const size_t ientry = (size_t)((double)histo_len * Ynormalized);
+ ASSERT(ientry < histo_len);
+ ++histo[ientry];
+ }
+ }
+
+ rcp_npixels = 1.0 / (double)(img->width * img->height);
+
+ /* Find the first histogram entry whose cumulative contains N% of the pixels.
+ * N is defined empirically to 90% */
+ FOR_EACH(i, 0, histo_len) {
+ if(i > 0) histo[i] += histo[i-1]; /* Compute the cumulative */
+ if((double)histo[i] * rcp_npixels > 0.9) break;
+ }
+
+ /* Define the width of an histogram entry */
+ Ydelta = (img->Yrange[1] - img->Yrange[0]) / (double)histo_len;
+
+ /* Compute the upper bound luminance value of the found histogram entry */
+ Ymax = img->Yrange[0]
+ + (double)(i+1/*Upper bound of the histogram entry*/)*Ydelta;
+
+ /* Use the previously value as the normalization factor scaled by an
+ * emperical factor arbitrarly set to 1.8 */
+ return Ymax * 1.8;
+}
+
+/*******************************************************************************
+ * Program
+ ******************************************************************************/
+int
+main(int argc, char** argv)
+{
+ FILE* stream_out = stdout;
+ FILE* stream_in = stdin;
+ const char* stream_out_name = "stdout";
+ const char* stream_in_name = "stdin";
+ struct img img = IMG_NULL;
+ struct args args = ARGS_DEFAULT;
+ double Yscale;
+ const int nprocs = omp_get_num_procs();
+ int err = 0;
+ int64_t i;
+ res_T res = RES_OK;
+
+ res = args_init(&args, argc, argv);
+ if(res != RES_OK) goto error;
+ if(args.quit) goto exit;
+
+ if(args.output) {
+ res = open_output_stream(args.output, args.force_overwrite, &stream_out);
+ if(res != RES_OK) goto error;
+ stream_out_name = args.output;
+ }
+ if(args.input) {
+ res = open_input_stream(args.input, &stream_in);
+ if(res != RES_OK) goto error;
+ stream_in_name = args.input;
+ }
+
+ res = img_load(&img, stream_in, stream_in_name);
+ if(res != RES_OK) goto error;
+
+ Yscale = args.exposure / compute_img_normalization_factor(&img);
+
+ omp_set_num_threads(nprocs);
+ /* Convert input HDR XYZ image in RGB LDR image */
+ #pragma omp parallel for
+ for(i=0; i < (int64_t)(img.width*img.height); ++i) {
+ const size_t y = (size_t)i / img.width;
+ const size_t x = (size_t)i % img.width;
+ double* row = (double*)(img.pixels + img.pitch*y);
+ double* pixel = row + x*3;
+
+ /* Scale the pixel value */
+ pixel[0] = pixel[0] * Yscale;
+ pixel[1] = pixel[1] * Yscale;
+ pixel[2] = pixel[2] * Yscale;
+
+ XYZ_to_RGB(pixel); /* Convert in RGB color space */
+ tone_mapping(pixel); /* Tone map the RGB pixel */
+ RGB_to_sRGB(pixel); /* Convert in sRGB color space (i.e. gamma correction) */
+ }
+
+ res = img_write_ppm(&img, stream_out, stream_out_name);
+ if(res != RES_OK) goto error;
+
+exit:
+ if(stream_out && stream_out != stdout) fclose(stream_out);
+ if(stream_in && stream_in != stdin) fclose(stream_in);
+ args_release(&args);
+ img_release(&img);
+ return err;
+error:
+ err = -1;
+ goto exit;
+}
+
