[patch, libv4l]: Introduce define for lookup table size

[Pavel Machek <pavel@ucw.cz>]

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Make lookup table size configurable at compile-time.
    
Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/lib/libv4lconvert/processing/libv4lprocessing-priv.h b/lib/libv4lconvert/processing/libv4lprocessing-priv.h
index e4a29dd..55e1687 100644
--- a/lib/libv4lconvert/processing/libv4lprocessing-priv.h
+++ b/lib/libv4lconvert/processing/libv4lprocessing-priv.h
@@ -25,6 +25,8 @@
 #include "../libv4lsyscall-priv.h"
 
 #define V4L2PROCESSING_UPDATE_RATE 10
+/* Size of lookup tables */
+#define LSIZE 256
 
 struct v4lprocessing_data {
 	struct v4lcontrol_data *control;
@@ -32,15 +34,15 @@ struct v4lprocessing_data {
 	int do_process;
 	int controls_changed;
 	/* True if any of the lookup tables does not contain
-	   linear 0-255 */
+	   linear 0-LSIZE-1 */
 	int lookup_table_active;
 	/* Counts the number of processed frames until a
 	   V4L2PROCESSING_UPDATE_RATE overflow happens */
 	int lookup_table_update_counter;
 	/* RGB/BGR lookup tables */
-	unsigned char comp1[256];
-	unsigned char green[256];
-	unsigned char comp2[256];
+	unsigned char comp1[LSIZE];
+	unsigned char green[LSIZE];
+	unsigned char comp2[LSIZE];
 	/* Filter private data for filters which need it */
 	/* whitebalance.c data */
 	int green_avg;
@@ -48,7 +50,7 @@ struct v4lprocessing_data {
 	int comp2_avg;
 	/* gamma.c data */
 	int last_gamma;
-	unsigned char gamma_table[256];
+	unsigned char gamma_table[LSIZE];
 	/* autogain.c data */
 	int last_gain_correction;
 };
diff --git a/lib/libv4lconvert/processing/libv4lprocessing.c b/lib/libv4lconvert/processing/libv4lprocessing.c
index b061f50..6d0ad20 100644
--- a/lib/libv4lconvert/processing/libv4lprocessing.c
+++ b/lib/libv4lconvert/processing/libv4lprocessing.c
@@ -74,7 +74,7 @@ static void v4lprocessing_update_lookup_tables(struct v4lprocessing_data *data,
 {
 	int i;
 
-	for (i = 0; i < 256; i++) {
+	for (i = 0; i < LSIZE; i++) {
 		data->comp1[i] = i;
 		data->green[i] = i;
 		data->comp2[i] = i;
diff --git a/lib/libv4lconvert/processing/whitebalance.c b/lib/libv4lconvert/processing/whitebalance.c
index c74069a..2dd33c1 100644
--- a/lib/libv4lconvert/processing/whitebalance.c
+++ b/lib/libv4lconvert/processing/whitebalance.c
@@ -27,7 +27,7 @@
 #include "libv4lprocessing-priv.h"
 #include "../libv4lconvert-priv.h" /* for PIX_FMT defines */
 
-#define CLIP256(color) (((color) > 0xff) ? 0xff : (((color) < 0) ? 0 : (color)))
+#define CLIPLSIZE(color) (((color) > LSIZE) ? LSIZE : (((color) < 0) ? 0 : (color)))
 #define CLIP(color, min, max) (((color) > (max)) ? (max) : (((color) < (min)) ? (min) : (color)))
 
 static int whitebalance_active(struct v4lprocessing_data *data)
@@ -111,10 +111,10 @@ static int whitebalance_calculate_lookup_tables_generic(
 
 	avg_avg = (data->green_avg + data->comp1_avg + data->comp2_avg) / 3;
 
-	for (i = 0; i < 256; i++) {
-		data->comp1[i] = CLIP256(data->comp1[i] * avg_avg / data->comp1_avg);
-		data->green[i] = CLIP256(data->green[i] * avg_avg / data->green_avg);
-		data->comp2[i] = CLIP256(data->comp2[i] * avg_avg / data->comp2_avg);
+	for (i = 0; i < LSIZE; i++) {
+		data->comp1[i] = CLIPLSIZE(data->comp1[i] * avg_avg / data->comp1_avg);
+		data->green[i] = CLIPLSIZE(data->green[i] * avg_avg / data->green_avg);
+		data->comp2[i] = CLIPLSIZE(data->comp2[i] * avg_avg / data->comp2_avg);
 	}
 
 	return 1;

-- 
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