2 * Copyright 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_ // NOLINT
12 #define INCLUDE_LIBYUV_SCALE_H_
14 #include "libyuv/basic_types.h"
21 // Supported filtering.
22 typedef enum FilterMode {
23 kFilterNone = 0, // Point sample; Fastest.
24 kFilterLinear = 1, // Filter horizontally only.
25 kFilterBilinear = 2, // Faster than box, but lower quality scaling down.
26 kFilterBox = 3 // Highest quality.
31 void ScalePlane(const uint8* src, int src_stride,
32 int src_width, int src_height,
33 uint8* dst, int dst_stride,
34 int dst_width, int dst_height,
35 enum FilterMode filtering);
38 void ScalePlane_16(const uint16* src, int src_stride,
39 int src_width, int src_height,
40 uint16* dst, int dst_stride,
41 int dst_width, int dst_height,
42 enum FilterMode filtering);
44 // Scales a YUV 4:2:0 image from the src width and height to the
45 // dst width and height.
46 // If filtering is kFilterNone, a simple nearest-neighbor algorithm is
47 // used. This produces basic (blocky) quality at the fastest speed.
48 // If filtering is kFilterBilinear, interpolation is used to produce a better
49 // quality image, at the expense of speed.
50 // If filtering is kFilterBox, averaging is used to produce ever better
51 // quality image, at further expense of speed.
52 // Returns 0 if successful.
55 int I420Scale(const uint8* src_y, int src_stride_y,
56 const uint8* src_u, int src_stride_u,
57 const uint8* src_v, int src_stride_v,
58 int src_width, int src_height,
59 uint8* dst_y, int dst_stride_y,
60 uint8* dst_u, int dst_stride_u,
61 uint8* dst_v, int dst_stride_v,
62 int dst_width, int dst_height,
63 enum FilterMode filtering);
66 int I420Scale_16(const uint16* src_y, int src_stride_y,
67 const uint16* src_u, int src_stride_u,
68 const uint16* src_v, int src_stride_v,
69 int src_width, int src_height,
70 uint16* dst_y, int dst_stride_y,
71 uint16* dst_u, int dst_stride_u,
72 uint16* dst_v, int dst_stride_v,
73 int dst_width, int dst_height,
74 enum FilterMode filtering);
77 // Legacy API. Deprecated.
79 int Scale(const uint8* src_y, const uint8* src_u, const uint8* src_v,
80 int src_stride_y, int src_stride_u, int src_stride_v,
81 int src_width, int src_height,
82 uint8* dst_y, uint8* dst_u, uint8* dst_v,
83 int dst_stride_y, int dst_stride_u, int dst_stride_v,
84 int dst_width, int dst_height,
85 LIBYUV_BOOL interpolate);
87 // Legacy API. Deprecated.
89 int ScaleOffset(const uint8* src_i420, int src_width, int src_height,
90 uint8* dst_i420, int dst_width, int dst_height, int dst_yoffset,
91 LIBYUV_BOOL interpolate);
93 // For testing, allow disabling of specialized scalers.
95 void SetUseReferenceImpl(LIBYUV_BOOL use);
100 } // namespace libyuv
103 #endif // INCLUDE_LIBYUV_SCALE_H_ NOLINT