misc awesomeness

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 193 insertions, 0 deletions

diff --git a/src/gamma-helper.c b/src/gamma-helper.c
new file mode 100644
index 0000000..78a38fc
--- /dev/null
+++ b/src/gamma-helper.c
@@ -0,0 +1,193 @@
+/**
+ * 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
+
+/**
+ * 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 = ramps->ANY.red_size + ramps->ANY.green_size + ramps->ANY.blue_size;
+  size_t d, i;
+  int r, e;
+  libgamma_gamma_ramps_any_t ramps_sys;
+  uint64_t* ramps_full;
+  
+  switch (depth_system)
+    {
+    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;
+    }
+  
+  ramps_sys.ANY.  red_size = ramps->ANY.  red_size;
+  ramps_sys.ANY.green_size = ramps->ANY.green_size;
+  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));
+  if (ramps_sys.ANY.red == NULL)
+    return LIBGAMMA_ERRNO_SET;
+  
+  if ((r = fun(this, &ramps_sys)))
+    {
+      e = errno;
+      free(ramps_sys.ANY.red);
+      return errno = e, r;
+    }
+  
+  ramps_full = malloc(n * sizeof(uint64_t));
+  if (ramps_full)
+    {
+      e = errno;
+      free(ramps_sys.ANY.red);
+      return errno = e, r;
+    }
+  
+  switch (depth_system)
+    {
+    case 16:
+      for (i = 0; i < n; i++)
+	ramps_full[i] = (uint64_t)(ramps_sys.bits16.red[i]) * 0x0001000100010001ULL;
+      break;
+      
+    case 32:
+      for (i = 0; i < n; i++)
+	ramps_full[i] = (uint64_t)(ramps_sys.bits32.red[i]) * 0x0000000100000001ULL;
+      break;
+      
+    case 64:
+      for (i = 0; i < n; i++)
+	ramps_full[i] = ramps_sys.bits64.red[i];
+      break;
+      
+    case -1:
+      for (i = 0; i < n; i++)
+	ramps_full[i] = (uint64_t)(ramps_sys.float_single.red[i] * (float)UINT64_MAX);
+      break;
+      
+    case -2:
+      for (i = 0; i < n; i++)
+	ramps_full[i] = (uint64_t)(ramps_sys.float_double.red[i] * (double)UINT64_MAX);
+      break;
+      
+    default: /* This is not possible. */
+      abort();
+      break;
+    }
+  
+  free(ramps_sys.ANY.red);
+  
+  if ((0 < depth_user) && (depth_user < 64))
+    for (i = 0; i < n; i++)
+      {
+	ramps_full[i] >>= (64 - depth_user - 1);
+	ramps_full[i] = (ramps_full[i] & 1) | (ramps_full[i] >> 1);
+      }
+  
+  switch (depth_user)
+    {
+    case 16:
+      for (i = 0; i < n; i++)
+	ramps->bits16.red[i] = (uint16_t)(ramps_full[i]);
+      break;
+      
+    case 32:
+      for (i = 0; i < n; i++)
+	ramps->bits32.red[i] = (uint32_t)(ramps_full[i]);
+      break;
+      
+    case 64:
+      for (i = 0; i < n; i++)
+	ramps->bits64.red[i] = ramps_full[i];
+      break;
+      
+    case -1:
+      for (i = 0; i < n; i++)
+	ramps->float_single.red[i] = (float)(ramps_full[i]) / (float)UINT64_MAX;
+      break;
+      
+    case -2:
+      for (i = 0; i < n; i++)
+	ramps->float_double.red[i] = (double)(ramps_full[i]) / (double)UINT64_MAX;
+      break;
+      
+    default: /* This is not possible. */
+      abort();
+      break;
+    }
+  
+  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)
+{
+}
+
+#undef ANY
+