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-rw-r--r--src/libclut.h309
1 files changed, 199 insertions, 110 deletions
diff --git a/src/libclut.h b/src/libclut.h
index a3ed8cf..d4c76dd 100644
--- a/src/libclut.h
+++ b/src/libclut.h
@@ -18,120 +18,12 @@
#define LIBCLUT_H
#include <stddef.h>
+#include <string.h>
#include <math.h>
/**
- * Modify a ramp.
- *
- * None of the parameter may have side-effects.
- *
- * This is intended for internal use.
- *
- * @param ramp Pointer to the gamma ramps, must have and array
- * named `channel` and a scalar named `channel` followed
- * by "_size".
- * @param channel The channel, must be either "red", "green", or "blue".
- * @param type The data type used for each stop in the ramps.
- * @param expr Expression that evalutes the value a stop should have.
- * It can use the variable `LIBCLUT_VALUE` to get the
- * current value of the stop.
- */
-#define libclut__(ramp, channel, type, expr) \
- do \
- { \
- size_t i__, n__ = (ramp)->channel##_size; \
- type LIBCLUT_VALUE; \
- for (i__ = 0; i__ < n__; i__++) \
- { \
- LIBCLUT_VALUE = (ramp)->channel[i__]; \
- (ramp)->channel[i__] = (type)(expr); \
- } \
- } \
- while (0)
-
-
-/**
- * A ramp set in CIE xyY.
- *
- * None of the parameter may have side-effects.
- *
- * This is intended for internal use.
- *
- * @param ramp Pointer to the gamma ramps, must have the arrays
- * `red`, `green`, and `blue`, and the scalars
- * `red_size`, `green_size`, and `blue_size`. Ramp
- * structures from libgamma can be used.
- * @param max The maximum value on each stop in the ramps.
- * @param type The data type used for each stop in the ramps.
- * @param utest Whether all channels can be modified at the same time.
- * This test does not have to include the ramp size.
- * @param rtest Whether the red channel have to be modified.
- * @param gtest Whether the green channel have to be modified.
- * @param btest Whether the blue channel have to be modified.
- * @param rexpr Expression calculating the intensity of the red channel.
- * The current value is stored in `Y__`.
- * @param gexpr Expression calculating the intensity of the green channel.
- * The current value is stored in `Y__`.
- * @param bexpr Expression calculating the intensity of the blue channel.
- * The current value is stored in `Y__`.
- */
-#define libclut_cie__(ramp, max, type, utest, rtest, gtest, btest, rexpr, gexpr, bexpr) \
- do \
- { \
- size_t rn__ = (ramp)->red_size; \
- size_t gn__ = (ramp)->green_size; \
- size_t bn__ = (ramp)->blue_size; \
- size_t i__; \
- double x__, y__, Y__, r__, g__, b__; \
- type* rs__ = (ramp)->red; \
- type* gs__ = (ramp)->green; \
- type* bs__ = (ramp)->blue; \
- if ((rn__ == gn__) && (gn__ == bn__) && (utest)) \
- { \
- if (!(rtest)) \
- break; \
- for (i__ = 0; i__ < rn__; i__) \
- { \
- libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \
- bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \
- libclut_model_ciexyy_to_srgb(x__, y__, rexpr, &r__, &g__, &b__); \
- rs__[i__] = (type)(r__ * (double)(max)); \
- gs__[i__] = (type)(g__ * (double)(max)); \
- bs__[i__] = (type)(b__ * (double)(max)); \
- } \
- } \
- else \
- { \
- if (!(rtest) && !(gtest) && !(btest)) \
- break; \
- libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \
- bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \
- if (rtest) \
- for (i__ = 0; i__ < rn__; i__) \
- { \
- libclut_model_ciexyy_to_srgb(x__, y__, rexpr, &r__, &g__, &b__); \
- rs__[i__] = (type)((r__ * (double)(max)); \
- } \
- if (gtest) \
- for (i__ = 0; i__ < gn__; i__) \
- { \
- libclut_model_ciexyy_to_srgb(x__, y__, gexpr, &r__, &g__, &b__); \
- gs__[i__] = (type)(g__ * (double)(max)); \
- } \
- if (btest) \
- for (i__ = 0; i__ < bn__; i__) \
- { \
- libclut_model_ciexyy_to_srgb(x__, y__, nexpr, &r__, &g__, &b__); \
- bs__[i__] = (type)(b__ * (double)(max)); \
- } \
- } \
- } \
- while (0)
-
-
-/**
* Apply contrast correction on the colour curves using sRGB.
*
* In this context, contrast is a measure of difference between
@@ -525,6 +417,8 @@
/**
* Manipulate the colour curves using a function on the sRGB colour space.
*
+ * None of the parameter may have side-effects.
+ *
* @param ramp Pointer to the gamma ramps, must have the arrays
* `red`, `green`, and `blue`, and the scalars
* `red_size`, `green_size`, and `blue_size`. Ramp
@@ -554,6 +448,8 @@
/**
* Manipulate the colour curves using a function on the CIE xyY colour space.
*
+ * None of the parameter may have side-effects.
+ *
* @param ramp Pointer to the gamma ramps, must have the arrays
* `red`, `green`, and `blue`, and the scalars
* `red_size`, `green_size`, and `blue_size`. Ramp
@@ -577,6 +473,8 @@
* Resets colour curvers to linear mappings.
* (Identity mapping if imaginged to map from [0, 1] to [0, 1].)
*
+ * None of the parameter may have side-effects.
+ *
* @param ramp Pointer to the gamma ramps, must have the arrays
* `red`, `green`, and `blue`, and the scalars
* `red_size`, `green_size`, and `blue_size`. Ramp
@@ -623,6 +521,8 @@
*
* Values below 0 are set to 0, and values above `max` are set to `max`.
*
+ * None of the parameter may have side-effects.
+ *
* @param ramp Pointer to the gamma ramps, must have the arrays
* `red`, `green`, and `blue`, and the scalars
* `red_size`, `green_size`, and `blue_size`. Ramp
@@ -647,6 +547,8 @@
/**
* Truncates a value to fit a boundary.
*
+ * None of the parameter may have side-effects.
+ *
* Intended for internal use.
*
* @param min The minimum allowed value.
@@ -655,7 +557,194 @@
* @return The value truncated into its boundary.
*/
#define libclut_clip__(min, val, max) \
- (LIBCLUT_VALUE < min ? min : LIBCLUT_VALUE > max ? max : LIBCLUT_VALUE)
+ (LIBCLUT_VALUE < min ? min : LIBCLUT_VALUE > max ? max : LIBCLUT_VALUE)
+
+
+/**
+ * Emulates low colour resolution.
+ *
+ * None of the parameter may have side-effects.
+ *
+ * @param ramp Pointer to the gamma ramps, must have the arrays
+ * `red`, `green`, and `blue`, and the scalars
+ * `red_size`, `green_size`, and `blue_size`. Ramp
+ * structures from libgamma can be used.
+ * @param max The maximum value on each stop in the ramps.
+ * This parameter is not used, it is just a dummy, to unify
+ * the API with the other functions.
+ * @param type The data type used for each stop in the ramps.
+ * @param x The desired emulated red encoding resolution, 0 for unchanged.
+ * @param y The desired emulated red output resolution, 0 for unchanged.
+ * @param x The desired emulated green encoding resolution, 0 for unchanged.
+ * @param y The desired emulated green output resolution, 0 for unchanged.
+ * @param x The desired emulated blue encoding resolution, 0 for unchanged.
+ * @param y The desired emulated blue output resolution, 0 for unchanged.
+ */
+#define libclut_lower_resolution(ramp, max, type, rx, ry, gx, gy, bx, by) \
+ do \
+ { \
+ libclut_lower_resolution__(ramp, red, max, type, rx, ry); \
+ libclut_lower_resolution__(ramp, green, max, type, gx, gy); \
+ libclut_lower_resolution__(ramp, blue, max, type, bx, by); \
+ } \
+ while (0)
+
+
+/**
+ * Emulates low colour resolution of a channel.
+ *
+ * None of the parameter may have side-effects.
+ *
+ * Intended for internal use.
+ *
+ * @param ramp Pointer to the gamma ramps, must have the arrays
+ * `red`, `green`, and `blue`, and the scalars
+ * `red_size`, `green_size`, and `blue_size`. Ramp
+ * structures from libgamma can be used.
+ * @param channel The channel, must be either "red", "green", or "blue".
+ * @param max The maximum value on each stop in the ramps.
+ * This parameter is not used, it is just a dummy, to unify
+ * the API with the other functions.
+ * @param type The data type used for each stop in the ramps.
+ * @param x The desired emulated encoding resolution, 0 for unchanged.
+ * @param y The desired emulated output resolution, 0 for unchanged.
+ */
+#define libclut_lower_resolution__(ramp, channel, max, type, x, y) \
+ do \
+ { \
+ if ((x) || (y)) \
+ { \
+ size_t x__, y__, i__, n__ = (ramp)->channel##_size; \
+ double xm__ = (double)((x) - 1), ym__ = (double)((y) - 1); \
+ type c__[n__]; /* Do not use alloca! */ \
+ for (i__ = 0; i__ < n__; i__++) \
+ { \
+ if ((x__ = i__), (x)) \
+ { \
+ x__ = (size_t)((double)i__ * (x) / n__); \
+ x__ = (size_t)((double)x__ * i__ / xm__); \
+ } \
+ if (!(y)) \
+ c__[i__] = (ramp)->channel[x__]; \
+ else \
+ { \
+ y__ = (size_t)((double)((ramp)->channel[x__]) / (max) * ym__ + 0.5); \
+ c__[i__] = (type)((double)y__ / ym__ * (max)); \
+ } \
+ } \
+ memcpy((ramp)->channel, c__, n__ * sizeof(type)); \
+ } \
+ } \
+ while (0)
+
+
+/**
+ * Modify a ramp.
+ *
+ * None of the parameter may have side-effects.
+ *
+ * This is intended for internal use.
+ *
+ * @param ramp Pointer to the gamma ramps, must have and array
+ * named `channel` and a scalar named `channel` followed
+ * by "_size".
+ * @param channel The channel, must be either "red", "green", or "blue".
+ * @param type The data type used for each stop in the ramps.
+ * @param expr Expression that evalutes the value a stop should have.
+ * It can use the variable `LIBCLUT_VALUE` to get the
+ * current value of the stop.
+ */
+#define libclut__(ramp, channel, type, expr) \
+ do \
+ { \
+ size_t i__, n__ = (ramp)->channel##_size; \
+ type LIBCLUT_VALUE; \
+ for (i__ = 0; i__ < n__; i__++) \
+ { \
+ LIBCLUT_VALUE = (ramp)->channel[i__]; \
+ (ramp)->channel[i__] = (type)(expr); \
+ } \
+ } \
+ while (0)
+
+
+/**
+ * A ramp set in CIE xyY.
+ *
+ * None of the parameter may have side-effects.
+ *
+ * This is intended for internal use.
+ *
+ * @param ramp Pointer to the gamma ramps, must have the arrays
+ * `red`, `green`, and `blue`, and the scalars
+ * `red_size`, `green_size`, and `blue_size`. Ramp
+ * structures from libgamma can be used.
+ * @param max The maximum value on each stop in the ramps.
+ * @param type The data type used for each stop in the ramps.
+ * @param utest Whether all channels can be modified at the same time.
+ * This test does not have to include the ramp size.
+ * @param rtest Whether the red channel have to be modified.
+ * @param gtest Whether the green channel have to be modified.
+ * @param btest Whether the blue channel have to be modified.
+ * @param rexpr Expression calculating the intensity of the red channel.
+ * The current value is stored in `Y__`.
+ * @param gexpr Expression calculating the intensity of the green channel.
+ * The current value is stored in `Y__`.
+ * @param bexpr Expression calculating the intensity of the blue channel.
+ * The current value is stored in `Y__`.
+ */
+#define libclut_cie__(ramp, max, type, utest, rtest, gtest, btest, rexpr, gexpr, bexpr) \
+ do \
+ { \
+ size_t rn__ = (ramp)->red_size; \
+ size_t gn__ = (ramp)->green_size; \
+ size_t bn__ = (ramp)->blue_size; \
+ size_t i__; \
+ double x__, y__, Y__, r__, g__, b__; \
+ type* rs__ = (ramp)->red; \
+ type* gs__ = (ramp)->green; \
+ type* bs__ = (ramp)->blue; \
+ if ((rn__ == gn__) && (gn__ == bn__) && (utest)) \
+ { \
+ if (!(rtest)) \
+ break; \
+ for (i__ = 0; i__ < rn__; i__) \
+ { \
+ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \
+ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \
+ libclut_model_ciexyy_to_srgb(x__, y__, rexpr, &r__, &g__, &b__); \
+ rs__[i__] = (type)(r__ * (double)(max)); \
+ gs__[i__] = (type)(g__ * (double)(max)); \
+ bs__[i__] = (type)(b__ * (double)(max)); \
+ } \
+ } \
+ else \
+ { \
+ if (!(rtest) && !(gtest) && !(btest)) \
+ break; \
+ libclut_model_srgb_to_ciexyy(rs__[i__] / ((double)(max)), gs__[i__] / ((double)(max)), \
+ bs__[i__] / ((double)(max)), &x__, &y__, &Y__); \
+ if (rtest) \
+ for (i__ = 0; i__ < rn__; i__) \
+ { \
+ libclut_model_ciexyy_to_srgb(x__, y__, rexpr, &r__, &g__, &b__); \
+ rs__[i__] = (type)((r__ * (double)(max)); \
+ } \
+ if (gtest) \
+ for (i__ = 0; i__ < gn__; i__) \
+ { \
+ libclut_model_ciexyy_to_srgb(x__, y__, gexpr, &r__, &g__, &b__); \
+ gs__[i__] = (type)(g__ * (double)(max)); \
+ } \
+ if (btest) \
+ for (i__ = 0; i__ < bn__; i__) \
+ { \
+ libclut_model_ciexyy_to_srgb(x__, y__, nexpr, &r__, &g__, &b__); \
+ bs__[i__] = (type)(b__ * (double)(max)); \
+ } \
+ } \
+ } \
+ while (0)