Moving all scan/iscan code into separate vp9_scan.{h, c} files.

Now we have entropy code separate from scan/iscan code. The next step
in future is to move iscan code from common part to the encoder.

Change-Id: Id9732f7d80aec00af35c1d58d1137c4c96c91451

1 files changed, 200 insertions, 0 deletions

diff --git a/vp9/common/vp9_scan.h b/vp9/common/vp9_scan.h
new file mode 100644
index 000000000..a5c8463d5
--- /dev/null
+++ b/vp9/common/vp9_scan.h
@@ -0,0 +1,200 @@
+/*
+ *  Copyright (c) 2013 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 VP9_COMMON_VP9_SCAN_H_
+#define VP9_COMMON_VP9_SCAN_H_
+
+#include "vpx/vpx_integer.h"
+#include "vpx_ports/mem.h"
+
+#include "vp9/common/vp9_enums.h"
+
+#define MAX_NEIGHBORS 2
+
+extern DECLARE_ALIGNED(16, const int16_t, vp9_default_scan_4x4[16]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_col_scan_4x4[16]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_row_scan_4x4[16]);
+
+extern DECLARE_ALIGNED(16, const int16_t, vp9_default_scan_8x8[64]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_col_scan_8x8[64]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_row_scan_8x8[64]);
+
+extern DECLARE_ALIGNED(16, const int16_t, vp9_default_scan_16x16[256]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_col_scan_16x16[256]);
+extern DECLARE_ALIGNED(16, const int16_t, vp9_row_scan_16x16[256]);
+
+extern DECLARE_ALIGNED(16, const int16_t, vp9_default_scan_32x32[1024]);
+
+extern DECLARE_ALIGNED(16, int16_t, vp9_default_iscan_4x4[16]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_col_iscan_4x4[16]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_row_iscan_4x4[16]);
+
+extern DECLARE_ALIGNED(16, int16_t, vp9_default_iscan_8x8[64]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_col_iscan_8x8[64]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_row_iscan_8x8[64]);
+
+extern DECLARE_ALIGNED(16, int16_t, vp9_default_iscan_16x16[256]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_col_iscan_16x16[256]);
+extern DECLARE_ALIGNED(16, int16_t, vp9_row_iscan_16x16[256]);
+
+extern DECLARE_ALIGNED(16, int16_t, vp9_default_iscan_32x32[1024]);
+
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_default_scan_4x4_neighbors[17 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_col_scan_4x4_neighbors[17 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_row_scan_4x4_neighbors[17 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_col_scan_8x8_neighbors[65 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_row_scan_8x8_neighbors[65 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_default_scan_8x8_neighbors[65 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_col_scan_16x16_neighbors[257 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_row_scan_16x16_neighbors[257 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_default_scan_16x16_neighbors[257 * MAX_NEIGHBORS]);
+extern DECLARE_ALIGNED(16, int16_t,
+                       vp9_default_scan_32x32_neighbors[1025 * MAX_NEIGHBORS]);
+
+
+void vp9_init_neighbors();
+
+static INLINE const int16_t* get_scan_4x4(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_scan_4x4;
+    case DCT_ADST:
+      return vp9_col_scan_4x4;
+    default:
+      return vp9_default_scan_4x4;
+  }
+}
+
+static INLINE void get_scan_nb_4x4(TX_TYPE tx_type,
+                                   const int16_t **scan, const int16_t **nb) {
+  switch (tx_type) {
+    case ADST_DCT:
+      *scan = vp9_row_scan_4x4;
+      *nb = vp9_row_scan_4x4_neighbors;
+      break;
+    case DCT_ADST:
+      *scan = vp9_col_scan_4x4;
+      *nb = vp9_col_scan_4x4_neighbors;
+      break;
+    default:
+      *scan = vp9_default_scan_4x4;
+      *nb = vp9_default_scan_4x4_neighbors;
+      break;
+  }
+}
+
+static INLINE const int16_t* get_iscan_4x4(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_iscan_4x4;
+    case DCT_ADST:
+      return vp9_col_iscan_4x4;
+    default:
+      return vp9_default_iscan_4x4;
+  }
+}
+
+static INLINE const int16_t* get_scan_8x8(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_scan_8x8;
+    case DCT_ADST:
+      return vp9_col_scan_8x8;
+    default:
+      return vp9_default_scan_8x8;
+  }
+}
+
+static INLINE void get_scan_nb_8x8(TX_TYPE tx_type,
+                                   const int16_t **scan, const int16_t **nb) {
+  switch (tx_type) {
+    case ADST_DCT:
+      *scan = vp9_row_scan_8x8;
+      *nb = vp9_row_scan_8x8_neighbors;
+      break;
+    case DCT_ADST:
+      *scan = vp9_col_scan_8x8;
+      *nb = vp9_col_scan_8x8_neighbors;
+      break;
+    default:
+      *scan = vp9_default_scan_8x8;
+      *nb = vp9_default_scan_8x8_neighbors;
+      break;
+  }
+}
+
+static INLINE const int16_t* get_iscan_8x8(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_iscan_8x8;
+    case DCT_ADST:
+      return vp9_col_iscan_8x8;
+    default:
+      return vp9_default_iscan_8x8;
+  }
+}
+
+static INLINE const int16_t* get_scan_16x16(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_scan_16x16;
+    case DCT_ADST:
+      return vp9_col_scan_16x16;
+    default:
+      return vp9_default_scan_16x16;
+  }
+}
+
+static INLINE void get_scan_nb_16x16(TX_TYPE tx_type,
+                                     const int16_t **scan, const int16_t **nb) {
+  switch (tx_type) {
+    case ADST_DCT:
+      *scan = vp9_row_scan_16x16;
+      *nb = vp9_row_scan_16x16_neighbors;
+      break;
+    case DCT_ADST:
+      *scan = vp9_col_scan_16x16;
+      *nb = vp9_col_scan_16x16_neighbors;
+      break;
+    default:
+      *scan = vp9_default_scan_16x16;
+      *nb = vp9_default_scan_16x16_neighbors;
+      break;
+  }
+}
+
+static INLINE const int16_t* get_iscan_16x16(TX_TYPE tx_type) {
+  switch (tx_type) {
+    case ADST_DCT:
+      return vp9_row_iscan_16x16;
+    case DCT_ADST:
+      return vp9_col_iscan_16x16;
+    default:
+      return vp9_default_iscan_16x16;
+  }
+}
+
+static INLINE int get_coef_context(const int16_t *neighbors,
+                                   uint8_t *token_cache,
+                                   int c) {
+  return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
+          token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1;
+}
+
+#endif  // VP9_COMMON_VP9_SCAN_H_