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-rw-r--r--src/lib/gamma-helper.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/src/lib/gamma-helper.c b/src/lib/gamma-helper.c
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+/**
+ * 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 "gamma-helper.h"
+
+#include "libgamma-method.h"
+#include "libgamma-error.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+
+#define ANY bits64
+
+
+/**
+ * Convert any set of gamma ramps into a 64-bit integer array with all channels.
+ *
+ * @param depth The depth of the gamma ramp, `-1` for `float`, `-2` for `double`.
+ * @param n The grand size of gamma ramps (sum of all channels' sizes.)
+ * @param out Output array.
+ * @param in Input gamma ramps.
+ */
+static void translate_to_64(signed depth, size_t n, uint64_t* restrict out, libgamma_gamma_ramps_any_t in)
+{
+ size_t i;
+ switch (depth)
+ {
+ case 16:
+ for (i = 0; i < n; i++)
+ out[i] = (uint64_t)(in.bits16.red[i]) * 0x0001000100010001ULL;
+ break;
+
+ case 32:
+ for (i = 0; i < n; i++)
+ out[i] = (uint64_t)(in.bits32.red[i]) * 0x0000000100000001ULL;
+ break;
+
+ case 64:
+ for (i = 0; i < n; i++)
+ out[i] = in.bits64.red[i];
+ break;
+
+ case -1:
+ for (i = 0; i < n; i++)
+ out[i] = (uint64_t)(in.float_single.red[i] * (float)UINT64_MAX);
+ break;
+
+ case -2:
+ for (i = 0; i < n; i++)
+ out[i] = (uint64_t)(in.float_double.red[i] * (double)UINT64_MAX);
+ break;
+
+ default: /* This is not possible. */
+ abort();
+ break;
+ }
+}
+
+
+/**
+ * Undo the actions of `translate_to_64`.
+ *
+ * @param depth The depth of the gamma ramp, `-1` for `float`, `-2` for `double`.
+ * @param n The grand size of gamma ramps (sum of all channels' sizes.)
+ * @param out Output gamma ramps.
+ * @param in Input array, may be modified.
+ */
+static void translate_from_64(signed depth, size_t n, libgamma_gamma_ramps_any_t out, uint64_t* restrict in)
+{
+ size_t i;
+
+ switch (depth)
+ {
+ case 16:
+ for (i = 0; i < n; i++)
+ out.bits16.red[i] = (uint16_t)(in[i] / 0x0001000100010001ULL);
+ break;
+
+ case 32:
+ for (i = 0; i < n; i++)
+ out.bits32.red[i] = (uint32_t)(in[i] / 0x0000000100000001ULL);
+ break;
+
+ case 64:
+ for (i = 0; i < n; i++)
+ out.bits64.red[i] = in[i];
+ break;
+
+ case -1:
+ for (i = 0; i < n; i++)
+ out.float_single.red[i] = (float)(in[i]) / (float)UINT64_MAX;
+ break;
+
+ case -2:
+ for (i = 0; i < n; i++)
+ out.float_double.red[i] = (double)(in[i]) / (double)UINT64_MAX;
+ break;
+
+ default: /* This is not possible. */
+ abort();
+ break;
+ }
+}
+
+
+/**
+ * Allocate and initalise a gamma ramp with any depth.
+ *
+ * @param ramps_sys Output gamma ramps.
+ * @param ramps The gamma ramps whose sizes should be duplicated.
+ * @param depth The depth of the gamma ramps to allocate,
+ * `-1` for `float`, `-2` for `double`.
+ * @param elements Output reference for the grand size of the gamma ramps.
+ * @return Zero on success, otherwise (negative) the value of an
+ * error identifier provided by this library.
+ */
+static int allocated_any_ramp(libgamma_gamma_ramps_any_t* restrict ramps_sys,
+ libgamma_gamma_ramps_any_t ramps, signed depth, size_t* restrict elements)
+{
+ size_t n = 0;
+ size_t d;
+
+ switch (depth)
+ {
+ case 16: d = sizeof(uint16_t); break;
+ case 32: d = sizeof(uint32_t); break;
+ case 64: d = sizeof(uint64_t); break;
+ case -1: d = sizeof(float); break;
+ case -2: d = sizeof(double); break;
+ default:
+ return errno = EINVAL, LIBGAMMA_ERRNO_SET;
+ }
+
+ n += ramps_sys->ANY. red_size = ramps.ANY. red_size;
+ n += ramps_sys->ANY.green_size = ramps.ANY.green_size;
+ n += ramps_sys->ANY. blue_size = ramps.ANY. blue_size;
+
+ ramps_sys->ANY.red = malloc(n * d);
+ ramps_sys->ANY.green = (void*)(((char*)(ramps_sys->ANY. red)) + ramps.ANY. red_size * d / sizeof(char));
+ ramps_sys->ANY.blue = (void*)(((char*)(ramps_sys->ANY.green)) + ramps.ANY.green_size * d / sizeof(char));
+
+ *elements = n;
+ return ramps_sys->ANY.red ? 0 : LIBGAMMA_ERRNO_SET;
+}
+
+
+/**
+ * Get current the gamma ramps for a CRTC, re-encoding version.
+ *
+ * @param this The CRTC state.
+ * @param ramps The gamma ramps to fill with the current values.
+ * @param depth_user The depth of the gamma ramps that are provided by the user,
+ * `-1` for `float`, `-2` for `double`.
+ * @param depth_system The depth of the gamma ramps as required by the adjustment method,
+ * `-1` for `float`, `-2` for `double`.
+ * @param fun Function that is to be used read the ramps, its parameters have
+ * the same function as those of this function with the same names,
+ * and the return value too is identical.
+ * @return Zero on success, otherwise (negative) the value of an
+ * error identifier provided by this library.
+ */
+int libgamma_translated_ramp_get_(libgamma_crtc_state_t* restrict this,
+ libgamma_gamma_ramps_any_t* restrict ramps,
+ signed depth_user, signed depth_system,
+ libgamma_get_ramps_any_fun* fun)
+{
+ size_t n;
+ int r;
+ libgamma_gamma_ramps_any_t ramps_sys;
+ uint64_t* restrict ramps_full;
+
+ if ((r = allocated_any_ramp(&ramps_sys, *ramps, depth_system, &n)))
+ return r;
+
+ if ((r = fun(this, &ramps_sys)))
+ {
+ free(ramps_sys.ANY.red);
+ return r;
+ }
+
+ if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL)
+ {
+ free(ramps_sys.ANY.red);
+ return LIBGAMMA_ERRNO_SET;
+ }
+
+ translate_to_64(depth_system, n, ramps_full, ramps_sys);
+ free(ramps_sys.ANY.red);
+
+ translate_from_64(depth_user, n, *ramps, ramps_full);
+ free(ramps_full);
+ return 0;
+}
+
+
+/**
+ * Set the gamma ramps for a CRTC, re-encoding version.
+ *
+ * @param this The CRTC state.
+ * @param ramps The gamma ramps to apply.
+ * @param depth_user The depth of the gamma ramps that are provided by the user,
+ * `-1` for `float`, `-2` for `double`.
+ * @param depth_system The depth of the gamma ramps as required by the adjustment method,
+ * `-1` for `float`, `-2` for `double`.
+ * @param fun Function that is to be used write the ramps, its parameters have
+ * the same function as those of this function with the same names,
+ * and the return value too is identical.
+ * @return Zero on success, otherwise (negative) the value of an
+ * error identifier provided by this library.
+ */
+int libgamma_translated_ramp_set_(libgamma_crtc_state_t* restrict this,
+ libgamma_gamma_ramps_any_t ramps,
+ signed depth_user, signed depth_system,
+ libgamma_set_ramps_any_fun* fun)
+{
+ size_t n;
+ int r;
+ libgamma_gamma_ramps_any_t ramps_sys;
+ uint64_t* restrict ramps_full;
+
+ if ((r = allocated_any_ramp(&ramps_sys, ramps, depth_system, &n)))
+ return r;
+
+ if ((ramps_full = malloc(n * sizeof(uint64_t))) == NULL)
+ {
+ free(ramps_sys.ANY.red);
+ return LIBGAMMA_ERRNO_SET;
+ }
+
+ translate_to_64(depth_user, n, ramps_full, ramps);
+ translate_from_64(depth_system, n, ramps_sys, ramps_full);
+ free(ramps_full);
+
+ r = fun(this, ramps_sys);
+
+ free(ramps_sys.ANY.red);
+ return r;
+}
+
+
+#undef ANY
+
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