Add vpx_dsp_common.h file

Move the clamp functions to vpx_dsp_common.h file. Clear out the
dependency of vp9_loopfilter_filters.c on vp9_common.h file.

Change-Id: I9c4b928bcd7f597106b5aa96354356d3775a3431

vp9/common/vp9_common.h

@@ -16,6 +16,7 @@
 #include <assert.h>
 
 #include "./vpx_config.h"
+#include "vpx_dsp/vpx_dsp_common.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vpx/vpx_integer.h"
 #include "vp9/common/vp9_systemdependent.h"
@@ -24,9 +25,6 @@
 extern "C" {
 #endif
 
-#define MIN(x, y) (((x) < (y)) ? (x) : (y))
-#define MAX(x, y) (((x) > (y)) ? (x) : (y))
-
 // Only need this for fixed-size arrays, for structs just assign.
 #define vp9_copy(dest, src) {            \
     assert(sizeof(dest) == sizeof(src)); \
@@ -42,18 +40,6 @@ extern "C" {
 #define vp9_zero(dest) memset(&(dest), 0, sizeof(dest))
 #define vp9_zero_array(dest, n) memset(dest, 0, n * sizeof(*dest))
 
-static INLINE uint8_t clip_pixel(int val) {
-  return (val > 255) ? 255 : (val < 0) ? 0 : val;
-}
-
-static INLINE int clamp(int value, int low, int high) {
-  return value < low ? low : (value > high ? high : value);
-}
-
-static INLINE double fclamp(double value, double low, double high) {
-  return value < low ? low : (value > high ? high : value);
-}
-
 static INLINE int get_unsigned_bits(unsigned int num_values) {
   return num_values > 0 ? get_msb(num_values) + 1 : 0;
 }

vp9/common/vp9_loopfilter_filters.c

@@ -9,8 +9,8 @@
  */
 
 #include "./vpx_config.h"
+#include "vpx_dsp/vpx_dsp_common.h"
 #include "vpx_ports/mem.h"
-#include "vp9/common/vp9_common.h"
 
 static INLINE int8_t signed_char_clamp(int t) {
   return (int8_t)clamp(t, -128, 127);

vpx_dsp/vpx_dsp.mk

@@ -9,6 +9,7 @@
 ##
 
 DSP_SRCS-yes += vpx_dsp.mk
+DSP_SRCS-yes += vpx_dsp_common.h
 
 DSP_SRCS-$(HAVE_MSA)    += mips/macros_msa.h
 

vpx_dsp/vpx_dsp_common.h

@@ -0,0 +1,43 @@
+/*
+ *  Copyright (c) 2015 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VPX_DSP_COMMON_H_
+#define VPX_DSP_COMMON_H_
+
+#include <stdlib.h>
+
+#include "./vpx_config.h"
+#include "vpx/vpx_integer.h"
+#include "vpx_ports/mem.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+
+static INLINE uint8_t clip_pixel(int val) {
+  return (val > 255) ? 255 : (val < 0) ? 0 : val;
+}
+
+static INLINE int clamp(int value, int low, int high) {
+  return value < low ? low : (value > high ? high : value);
+}
+
+static INLINE double fclamp(double value, double low, double high) {
+  return value < low ? low : (value > high ? high : value);
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VPX_DSP_COMMON_H_