m + implement libgamma_translated_ramp_set_

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

1 files changed, 146 insertions, 79 deletions

diff --git a/src/gamma-helper.c b/src/gamma-helper.c
index 78a38fc..9ae7915 100644
--- a/src/gamma-helper.c
+++ b/src/gamma-helper.c
@@ -27,141 +27,185 @@
 
 #define ANY  bits64
 
+
 /**
- * Get current the gamma ramps for a CRTC, re-encoding version
+ * Convert any set of gamma ramps into a 64-bit integer array with all channels
  * 
- * @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
+ * @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
  */
-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)
+static void translate_to_64(signed depth, size_t n, uint64_t* restrict out, libgamma_gamma_ramps_any_t in)
 {
-  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)
+  size_t i;
+  switch (depth)
     {
     case 16:
       for (i = 0; i < n; i++)
-	ramps_full[i] = (uint64_t)(ramps_sys.bits16.red[i]) * 0x0001000100010001ULL;
+	out[i] = (uint64_t)(in.bits16.red[i]) * 0x0001000100010001ULL;
       break;
       
     case 32:
       for (i = 0; i < n; i++)
-	ramps_full[i] = (uint64_t)(ramps_sys.bits32.red[i]) * 0x0000000100000001ULL;
+	out[i] = (uint64_t)(in.bits32.red[i]) * 0x0000000100000001ULL;
       break;
       
     case 64:
       for (i = 0; i < n; i++)
-	ramps_full[i] = ramps_sys.bits64.red[i];
+	out[i] = in.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);
+	out[i] = (uint64_t)(in.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);
+	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;
   
-  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)
+  switch (depth)
     {
     case 16:
       for (i = 0; i < n; i++)
-	ramps->bits16.red[i] = (uint16_t)(ramps_full[i]);
+	in[i] >>= (64 - depth - 1),
+	out.bits16.red[i] = (uint16_t)((in[i] & 1) | (in[i] >> 1));
       break;
       
     case 32:
       for (i = 0; i < n; i++)
-	ramps->bits32.red[i] = (uint32_t)(ramps_full[i]);
+	in[i] >>= (64 - depth - 1),
+	out.bits32.red[i] = (uint32_t)((in[i] & 1) | (in[i] >> 1));
       break;
       
     case 64:
       for (i = 0; i < n; i++)
-	ramps->bits64.red[i] = ramps_full[i];
+	out.bits64.red[i] = in[i];
       break;
       
     case -1:
       for (i = 0; i < n; i++)
-	ramps->float_single.red[i] = (float)(ramps_full[i]) / (float)UINT64_MAX;
+	out.float_single.red[i] = (float)(in[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;
+	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* 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;
 }
@@ -187,7 +231,30 @@ int libgamma_translated_ramp_set_(libgamma_crtc_state_t* restrict this,
 				  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* 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