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-rw-r--r--media/libaom/src/av1/common/scale.h67
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diff --git a/media/libaom/src/av1/common/scale.h b/media/libaom/src/av1/common/scale.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_AV1_COMMON_SCALE_H_
+#define AOM_AV1_COMMON_SCALE_H_
+
+#include "av1/common/convolve.h"
+#include "av1/common/mv.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SCALE_NUMERATOR 8
+
+#define REF_SCALE_SHIFT 14
+#define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
+#define REF_INVALID_SCALE -1
+
+struct scale_factors {
+ int x_scale_fp; // horizontal fixed point scale factor
+ int y_scale_fp; // vertical fixed point scale factor
+ int x_step_q4;
+ int y_step_q4;
+
+ int (*scale_value_x)(int val, const struct scale_factors *sf);
+ int (*scale_value_y)(int val, const struct scale_factors *sf);
+
+ // convolve_fn_ptr[subpel_x != 0][subpel_y != 0][is_compound]
+ aom_convolve_fn_t convolve[2][2][2];
+ aom_highbd_convolve_fn_t highbd_convolve[2][2][2];
+};
+
+MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf);
+
+void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
+ int other_h, int this_w, int this_h);
+
+static INLINE int av1_is_valid_scale(const struct scale_factors *sf) {
+ return sf->x_scale_fp != REF_INVALID_SCALE &&
+ sf->y_scale_fp != REF_INVALID_SCALE;
+}
+
+static INLINE int av1_is_scaled(const struct scale_factors *sf) {
+ return av1_is_valid_scale(sf) &&
+ (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE);
+}
+
+static INLINE int valid_ref_frame_size(int ref_width, int ref_height,
+ int this_width, int this_height) {
+ return 2 * this_width >= ref_width && 2 * this_height >= ref_height &&
+ this_width <= 16 * ref_width && this_height <= 16 * ref_height;
+}
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_COMMON_SCALE_H_