2 * Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #ifndef INCLUDE_LIBYUV_SCALE_H_
12 #define INCLUDE_LIBYUV_SCALE_H_
14 #include "third_party/libyuv/include/libyuv/basic_types.h"
21 // Supported filtering
23 kFilterNone = 0, // Point sample; Fastest
24 kFilterBilinear = 1, // Faster than box, but lower quality scaling down.
25 kFilterBox = 2 // Highest quality
28 // Scales a YUV 4:2:0 image from the src width and height to the
29 // dst width and height.
30 // If filtering is kFilterNone, a simple nearest-neighbor algorithm is
31 // used. This produces basic (blocky) quality at the fastest speed.
32 // If filtering is kFilterBilinear, interpolation is used to produce a better
33 // quality image, at the expense of speed.
34 // If filtering is kFilterBox, averaging is used to produce ever better
35 // quality image, at further expense of speed.
36 // Returns 0 if successful.
38 int I420Scale(const uint8* src_y, int src_stride_y,
39 const uint8* src_u, int src_stride_u,
40 const uint8* src_v, int src_stride_v,
41 int src_width, int src_height,
42 uint8* dst_y, int dst_stride_y,
43 uint8* dst_u, int dst_stride_u,
44 uint8* dst_v, int dst_stride_v,
45 int dst_width, int dst_height,
46 FilterModeEnum filtering);
48 // Legacy API. Deprecated
49 int Scale(const uint8* src_y, const uint8* src_u, const uint8* src_v,
50 int src_stride_y, int src_stride_u, int src_stride_v,
51 int src_width, int src_height,
52 uint8* dst_y, uint8* dst_u, uint8* dst_v,
53 int dst_stride_y, int dst_stride_u, int dst_stride_v,
54 int dst_width, int dst_height,
57 // Legacy API. Deprecated
58 int ScaleOffset(const uint8* src, int src_width, int src_height,
59 uint8* dst, int dst_width, int dst_height, int dst_yoffset,
62 // For testing, allow disabling of optimizations.
63 void SetUseReferenceImpl(int use);
70 #endif // INCLUDE_LIBYUV_SCALE_H_