1 files changed, 274 insertions, 0 deletions
diff --git a/src/lib/libgamma-method.c b/src/lib/libgamma-method.c
new file mode 100644
index 0000000..4c81549
--- /dev/null
+++ b/src/lib/libgamma-method.c
@@ -0,0 +1,274 @@
+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library 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 library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "libgamma-method.h"
+
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps_initialise(libgamma_gamma_ramps_t* restrict this)
+{
+  size_t n = this->red_size + this->green_size + this->blue_size;
+  this->red   = malloc(n * sizeof(uint16_t));
+  this->green = this->  red + this->  red_size;
+  this->blue  = this->green + this->green_size;
+  return this->red ? 0 : -1;
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps_destroy(libgamma_gamma_ramps_t* restrict this)
+{
+  free(this->red);
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps_free(libgamma_gamma_ramps_t* restrict this)
+{
+  free(this->red);
+  free(this);
+}
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps32_initialise(libgamma_gamma_ramps32_t* restrict this)
+{
+  size_t n = this->red_size + this->green_size + this->blue_size;
+  this->red   = malloc(n * sizeof(uint32_t));
+  this->green = this->  red + this->  red_size;
+  this->blue  = this->green + this->green_size;
+  return this->red ? 0 : -1;
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps32_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps32_destroy(libgamma_gamma_ramps32_t* restrict this)
+{
+  free(this->red);
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps32_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps32_free(libgamma_gamma_ramps32_t* restrict this)
+{
+  free(this->red);
+  free(this);
+}
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_ramps64_initialise(libgamma_gamma_ramps64_t* restrict this)
+{
+  size_t n = this->red_size + this->green_size + this->blue_size;
+  this->red   = malloc(n * sizeof(uint64_t));
+  this->green = this->  red + this->  red_size;
+  this->blue  = this->green + this->green_size;
+  return this->red ? 0 : -1;
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps64_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps64_destroy(libgamma_gamma_ramps64_t* restrict this)
+{
+  free(this->red);
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_ramps64_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_ramps64_free(libgamma_gamma_ramps64_t* restrict this)
+{
+  free(this->red);
+  free(this);
+}
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_rampsf_initialise(libgamma_gamma_rampsf_t* restrict this)
+{
+  size_t n = this->red_size + this->green_size + this->blue_size;
+  this->red   = malloc(n * sizeof(float));
+  this->green = this->  red + this->  red_size;
+  this->blue  = this->green + this->green_size;
+  return this->red ? 0 : -1;
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsf_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsf_destroy(libgamma_gamma_rampsf_t* restrict this)
+{
+  free(this->red);
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsf_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsf_free(libgamma_gamma_rampsf_t* restrict this)
+{
+  free(this->red);
+  free(this);
+}
+
+
+
+/**
+ * Initialise a gamma ramp in the proper way that allows all adjustment
+ * methods to read from and write to it without causing segmentation violation.
+ * 
+ * The input must have `red_size`, `green_size` and `blue_size` set to the
+ * sizes of the gamma ramps that should be allocated.
+ * 
+ * @param   this  The gamma ramps.
+ * @return        Zero on success, -1 on allocation error, `errno` will be set accordingly.
+ */
+int libgamma_gamma_rampsd_initialise(libgamma_gamma_rampsd_t* restrict this)
+{
+  size_t n = this->red_size + this->green_size + this->blue_size;
+#ifdef HAVE_LIBGAMMA_METHOD_LINUX_DRM
+  /* Valgrind complains about us reading uninitialize memory if we just use malloc. */
+  this->red = calloc(n, sizeof(double));
+#else
+  this->red = malloc(n * sizeof(double));
+#endif
+  this->green = this->  red + this->  red_size;
+  this->blue  = this->green + this->green_size;
+  return this->red == NULL ? -1 : 0;
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsd_initialise` or otherwise
+ * initialises in the proper manner.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsd_destroy(libgamma_gamma_rampsd_t* restrict this)
+{
+  free(this->red);
+}
+
+
+/**
+ * Release resources that are held by a gamma ramp strcuture that
+ * has been allocated by `libgamma_gamma_rampsd_initialise` or otherwise
+ * initialises in the proper manner, as well as release the pointer
+ * to the structure.
+ * 
+ * @param  this  The gamma ramps.
+ */
+void libgamma_gamma_rampsd_free(libgamma_gamma_rampsd_t* restrict this)
+{
+  free(this->red);
+  free(this);
+}
+