Moving scale_factors and related code to separate files.

Change-Id: I531829e5aee2a4a7a112d528ecccbddf052d0e74

6 files changed, 181 insertions, 150 deletions

diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index 60ef9c207..d117e771b 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -19,9 +19,9 @@
 
 #include "vp9/common/vp9_common.h"
 #include "vp9/common/vp9_common_data.h"
-#include "vp9/common/vp9_convolve.h"
 #include "vp9/common/vp9_enums.h"
 #include "vp9/common/vp9_mv.h"
+#include "vp9/common/vp9_scale.h"
 #include "vp9/common/vp9_seg_common.h"
 #include "vp9/common/vp9_treecoder.h"
 
@@ -171,24 +171,6 @@ enum mv_precision {
   MV_PRECISION_Q4
 };
 
-#define VP9_REF_SCALE_SHIFT 14
-#define VP9_REF_NO_SCALE (1 << VP9_REF_SCALE_SHIFT)
-
-struct scale_factors {
-  int x_scale_fp;   // horizontal fixed point scale factor
-  int y_scale_fp;   // vertical fixed point scale factor
-  int x_offset_q4;
-  int x_step_q4;
-  int y_offset_q4;
-  int y_step_q4;
-
-  int (*scale_value_x)(int val, const struct scale_factors *scale);
-  int (*scale_value_y)(int val, const struct scale_factors *scale);
-  void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
-  MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
-
-  convolve_fn_t predict[2][2][2];  // horiz, vert, avg
-};
 
 #if CONFIG_ALPHA
 enum { MAX_MB_PLANE = 4 };
diff --git a/vp9/common/vp9_reconinter.c b/vp9/common/vp9_reconinter.c
index a163106a0..cb746c7f3 100644
--- a/vp9/common/vp9_reconinter.c
+++ b/vp9/common/vp9_reconinter.c
@@ -10,140 +10,16 @@
 
 #include <assert.h>
 
+#include "./vpx_scale_rtcd.h"
 #include "./vpx_config.h"
+
 #include "vpx/vpx_integer.h"
+
 #include "vp9/common/vp9_blockd.h"
 #include "vp9/common/vp9_filter.h"
 #include "vp9/common/vp9_reconinter.h"
 #include "vp9/common/vp9_reconintra.h"
-#include "./vpx_scale_rtcd.h"
 
-static int scale_value_x_with_scaling(int val,
-                                      const struct scale_factors *scale) {
-  return (val * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT);
-}
-
-static int scale_value_y_with_scaling(int val,
-                                      const struct scale_factors *scale) {
-  return (val * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT);
-}
-
-static int unscaled_value(int val, const struct scale_factors *scale) {
-  (void) scale;
-  return val;
-}
-
-static MV32 mv_with_scaling(const MV *mv,
-                               const struct scale_factors *scale) {
-  const MV32 res = {
-    (mv->row * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->y_offset_q4,
-    (mv->col * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->x_offset_q4
-  };
-  return res;
-}
-
-static MV32 mv_without_scaling(const MV *mv,
-                               const struct scale_factors *scale) {
-  const MV32 res = {
-    mv->row,
-    mv->col
-  };
-  return res;
-}
-
-static void set_offsets_with_scaling(struct scale_factors *scale,
-                                     int row, int col) {
-  const int x_q4 = 16 * col;
-  const int y_q4 = 16 * row;
-
-  scale->x_offset_q4 = (x_q4 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xf;
-  scale->y_offset_q4 = (y_q4 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xf;
-}
-
-static void set_offsets_without_scaling(struct scale_factors *scale,
-                                        int row, int col) {
-  scale->x_offset_q4 = 0;
-  scale->y_offset_q4 = 0;
-}
-
-static int get_fixed_point_scale_factor(int other_size, int this_size) {
-  // Calculate scaling factor once for each reference frame
-  // and use fixed point scaling factors in decoding and encoding routines.
-  // Hardware implementations can calculate scale factor in device driver
-  // and use multiplication and shifting on hardware instead of division.
-  return (other_size << VP9_REF_SCALE_SHIFT) / this_size;
-}
-
-void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
-                                       int other_w, int other_h,
-                                       int this_w, int this_h) {
-  scale->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
-  scale->x_offset_q4 = 0;  // calculated per-mb
-  scale->x_step_q4 = (16 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT);
-
-  scale->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
-  scale->y_offset_q4 = 0;  // calculated per-mb
-  scale->y_step_q4 = (16 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT);
-
-  if ((other_w == this_w) && (other_h == this_h)) {
-    scale->scale_value_x = unscaled_value;
-    scale->scale_value_y = unscaled_value;
-    scale->set_scaled_offsets = set_offsets_without_scaling;
-    scale->scale_mv = mv_without_scaling;
-  } else {
-    scale->scale_value_x = scale_value_x_with_scaling;
-    scale->scale_value_y = scale_value_y_with_scaling;
-    scale->set_scaled_offsets = set_offsets_with_scaling;
-    scale->scale_mv = mv_with_scaling;
-  }
-
-  // TODO(agrange): Investigate the best choice of functions to use here
-  // for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
-  // to do at full-pel offsets. The current selection, where the filter is
-  // applied in one direction only, and not at all for 0,0, seems to give the
-  // best quality, but it may be worth trying an additional mode that does
-  // do the filtering on full-pel.
-  if (scale->x_step_q4 == 16) {
-    if (scale->y_step_q4 == 16) {
-      // No scaling in either direction.
-      scale->predict[0][0][0] = vp9_convolve_copy;
-      scale->predict[0][0][1] = vp9_convolve_avg;
-      scale->predict[0][1][0] = vp9_convolve8_vert;
-      scale->predict[0][1][1] = vp9_convolve8_avg_vert;
-      scale->predict[1][0][0] = vp9_convolve8_horiz;
-      scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
-    } else {
-      // No scaling in x direction. Must always scale in the y direction.
-      scale->predict[0][0][0] = vp9_convolve8_vert;
-      scale->predict[0][0][1] = vp9_convolve8_avg_vert;
-      scale->predict[0][1][0] = vp9_convolve8_vert;
-      scale->predict[0][1][1] = vp9_convolve8_avg_vert;
-      scale->predict[1][0][0] = vp9_convolve8;
-      scale->predict[1][0][1] = vp9_convolve8_avg;
-    }
-  } else {
-    if (scale->y_step_q4 == 16) {
-      // No scaling in the y direction. Must always scale in the x direction.
-      scale->predict[0][0][0] = vp9_convolve8_horiz;
-      scale->predict[0][0][1] = vp9_convolve8_avg_horiz;
-      scale->predict[0][1][0] = vp9_convolve8;
-      scale->predict[0][1][1] = vp9_convolve8_avg;
-      scale->predict[1][0][0] = vp9_convolve8_horiz;
-      scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
-    } else {
-      // Must always scale in both directions.
-      scale->predict[0][0][0] = vp9_convolve8;
-      scale->predict[0][0][1] = vp9_convolve8_avg;
-      scale->predict[0][1][0] = vp9_convolve8;
-      scale->predict[0][1][1] = vp9_convolve8_avg;
-      scale->predict[1][0][0] = vp9_convolve8;
-      scale->predict[1][0][1] = vp9_convolve8_avg;
-    }
-  }
-  // 2D subpel motion always gets filtered in both directions
-  scale->predict[1][1][0] = vp9_convolve8;
-  scale->predict[1][1][1] = vp9_convolve8_avg;
-}
 
 void vp9_setup_interp_filters(MACROBLOCKD *xd,
                               INTERPOLATIONFILTERTYPE mcomp_filter_type,
diff --git a/vp9/common/vp9_reconinter.h b/vp9/common/vp9_reconinter.h
index 6ec7323e1..82c0796dc 100644
--- a/vp9/common/vp9_reconinter.h
+++ b/vp9/common/vp9_reconinter.h
@@ -33,10 +33,6 @@ void vp9_setup_interp_filters(MACROBLOCKD *xd,
                               INTERPOLATIONFILTERTYPE filter,
                               VP9_COMMON *cm);
 
-void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
-                                       int other_w, int other_h,
-                                       int this_w, int this_h);
-
 void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
                                uint8_t *dst, int dst_stride,
                                const MV *mv_q3,
diff --git a/vp9/common/vp9_scale.c b/vp9/common/vp9_scale.c
new file mode 100644
index 000000000..80137e547
--- /dev/null
+++ b/vp9/common/vp9_scale.c
@@ -0,0 +1,135 @@
+/*
+ *  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.
+ */
+
+#include "./vp9_rtcd.h"
+#include "vp9/common/vp9_scale.h"
+
+static int scaled_x(int val, const struct scale_factors *scale) {
+  return val * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT;
+}
+
+static int scaled_y(int val, const struct scale_factors *scale) {
+  return val * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT;
+}
+
+static int unscaled_value(int val, const struct scale_factors *scale) {
+  (void) scale;
+  return val;
+}
+
+static MV32 scaled_mv(const MV *mv, const struct scale_factors *scale) {
+  const MV32 res = {
+    (mv->row * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->y_offset_q4,
+    (mv->col * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->x_offset_q4
+  };
+  return res;
+}
+
+static MV32 unscaled_mv(const MV *mv, const struct scale_factors *scale) {
+  const MV32 res = {
+    mv->row,
+    mv->col
+  };
+  return res;
+}
+
+static void set_offsets_with_scaling(struct scale_factors *scale,
+                                     int row, int col) {
+  const int x_q4 = 16 * col;
+  const int y_q4 = 16 * row;
+
+  scale->x_offset_q4 = (x_q4 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xF;
+  scale->y_offset_q4 = (y_q4 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xF;
+}
+
+static void set_offsets_without_scaling(struct scale_factors *scale,
+                                        int row, int col) {
+  scale->x_offset_q4 = 0;
+  scale->y_offset_q4 = 0;
+}
+
+static int get_fixed_point_scale_factor(int other_size, int this_size) {
+  // Calculate scaling factor once for each reference frame
+  // and use fixed point scaling factors in decoding and encoding routines.
+  // Hardware implementations can calculate scale factor in device driver
+  // and use multiplication and shifting on hardware instead of division.
+  return (other_size << VP9_REF_SCALE_SHIFT) / this_size;
+}
+
+void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
+                                       int other_w, int other_h,
+                                       int this_w, int this_h) {
+  scale->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
+  scale->x_offset_q4 = 0;  // calculated per-mb
+  scale->x_step_q4 = (16 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT);
+
+  scale->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
+  scale->y_offset_q4 = 0;  // calculated per-mb
+  scale->y_step_q4 = (16 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT);
+
+  if (other_w == this_w && other_h == this_h) {
+    scale->scale_value_x = unscaled_value;
+    scale->scale_value_y = unscaled_value;
+    scale->set_scaled_offsets = set_offsets_without_scaling;
+    scale->scale_mv = unscaled_mv;
+  } else {
+    scale->scale_value_x = scaled_x;
+    scale->scale_value_y = scaled_y;
+    scale->set_scaled_offsets = set_offsets_with_scaling;
+    scale->scale_mv = scaled_mv;
+  }
+
+  // TODO(agrange): Investigate the best choice of functions to use here
+  // for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
+  // to do at full-pel offsets. The current selection, where the filter is
+  // applied in one direction only, and not at all for 0,0, seems to give the
+  // best quality, but it may be worth trying an additional mode that does
+  // do the filtering on full-pel.
+  if (scale->x_step_q4 == 16) {
+    if (scale->y_step_q4 == 16) {
+      // No scaling in either direction.
+      scale->predict[0][0][0] = vp9_convolve_copy;
+      scale->predict[0][0][1] = vp9_convolve_avg;
+      scale->predict[0][1][0] = vp9_convolve8_vert;
+      scale->predict[0][1][1] = vp9_convolve8_avg_vert;
+      scale->predict[1][0][0] = vp9_convolve8_horiz;
+      scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
+    } else {
+      // No scaling in x direction. Must always scale in the y direction.
+      scale->predict[0][0][0] = vp9_convolve8_vert;
+      scale->predict[0][0][1] = vp9_convolve8_avg_vert;
+      scale->predict[0][1][0] = vp9_convolve8_vert;
+      scale->predict[0][1][1] = vp9_convolve8_avg_vert;
+      scale->predict[1][0][0] = vp9_convolve8;
+      scale->predict[1][0][1] = vp9_convolve8_avg;
+    }
+  } else {
+    if (scale->y_step_q4 == 16) {
+      // No scaling in the y direction. Must always scale in the x direction.
+      scale->predict[0][0][0] = vp9_convolve8_horiz;
+      scale->predict[0][0][1] = vp9_convolve8_avg_horiz;
+      scale->predict[0][1][0] = vp9_convolve8;
+      scale->predict[0][1][1] = vp9_convolve8_avg;
+      scale->predict[1][0][0] = vp9_convolve8_horiz;
+      scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
+    } else {
+      // Must always scale in both directions.
+      scale->predict[0][0][0] = vp9_convolve8;
+      scale->predict[0][0][1] = vp9_convolve8_avg;
+      scale->predict[0][1][0] = vp9_convolve8;
+      scale->predict[0][1][1] = vp9_convolve8_avg;
+      scale->predict[1][0][0] = vp9_convolve8;
+      scale->predict[1][0][1] = vp9_convolve8_avg;
+    }
+  }
+  // 2D subpel motion always gets filtered in both directions
+  scale->predict[1][1][0] = vp9_convolve8;
+  scale->predict[1][1][1] = vp9_convolve8_avg;
+}
diff --git a/vp9/common/vp9_scale.h b/vp9/common/vp9_scale.h
new file mode 100644
index 000000000..0414dde5e
--- /dev/null
+++ b/vp9/common/vp9_scale.h
@@ -0,0 +1,40 @@
+/*
+ *  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_SCALE_H_
+#define VP9_COMMON_VP9_SCALE_H_
+
+#include "vp9/common/vp9_mv.h"
+#include "vp9/common/vp9_convolve.h"
+
+#define VP9_REF_SCALE_SHIFT 14
+#define VP9_REF_NO_SCALE (1 << VP9_REF_SCALE_SHIFT)
+
+struct scale_factors {
+  int x_scale_fp;   // horizontal fixed point scale factor
+  int y_scale_fp;   // vertical fixed point scale factor
+  int x_offset_q4;
+  int x_step_q4;
+  int y_offset_q4;
+  int y_step_q4;
+
+  int (*scale_value_x)(int val, const struct scale_factors *scale);
+  int (*scale_value_y)(int val, const struct scale_factors *scale);
+  void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
+  MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
+
+  convolve_fn_t predict[2][2][2];  // horiz, vert, avg
+};
+
+void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
+                                       int other_w, int other_h,
+                                       int this_w, int this_h);
+
+#endif  //  VP9_COMMON_VP9_SCALE_H_
diff --git a/vp9/vp9_common.mk b/vp9/vp9_common.mk
index f9ad4bedd..d6b3ec087 100644
--- a/vp9/vp9_common.mk
+++ b/vp9/vp9_common.mk
@@ -49,6 +49,8 @@ VP9_COMMON_SRCS-yes += common/vp9_rtcd.c
 VP9_COMMON_SRCS-yes += common/vp9_rtcd_defs.sh
 VP9_COMMON_SRCS-yes += common/vp9_sadmxn.h
 VP9_COMMON_SRCS-yes += common/vp9_subpelvar.h
+VP9_COMMON_SRCS-yes += common/vp9_scale.h
+VP9_COMMON_SRCS-yes += common/vp9_scale.c
 VP9_COMMON_SRCS-yes += common/vp9_seg_common.h
 VP9_COMMON_SRCS-yes += common/vp9_seg_common.c
 VP9_COMMON_SRCS-yes += common/vp9_systemdependent.h