1/* 2 * Copyright 2011 The LibYuv Project Authors. All rights reserved. 3 * 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. 9 */ 10 11#ifndef INCLUDE_LIBYUV_SCALE_H_ // NOLINT 12#define INCLUDE_LIBYUV_SCALE_H_ 13 14#include "libyuv/basic_types.h" 15 16#ifdef __cplusplus 17namespace libyuv { 18extern "C" { 19#endif 20 21// Supported filtering 22enum FilterMode { 23 kFilterNone = 0, // Point sample; Fastest. 24 kFilterBilinear = 1, // Faster than box, but lower quality scaling down. 25 kFilterBox = 2 // Highest quality. 26}; 27 28// Scale a YUV plane. 29LIBYUV_API 30void ScalePlane(const uint8* src, int src_stride, 31 int src_width, int src_height, 32 uint8* dst, int dst_stride, 33 int dst_width, int dst_height, 34 FilterMode filtering); 35 36// Scales a YUV 4:2:0 image from the src width and height to the 37// dst width and height. 38// If filtering is kFilterNone, a simple nearest-neighbor algorithm is 39// used. This produces basic (blocky) quality at the fastest speed. 40// If filtering is kFilterBilinear, interpolation is used to produce a better 41// quality image, at the expense of speed. 42// If filtering is kFilterBox, averaging is used to produce ever better 43// quality image, at further expense of speed. 44// Returns 0 if successful. 45 46LIBYUV_API 47int I420Scale(const uint8* src_y, int src_stride_y, 48 const uint8* src_u, int src_stride_u, 49 const uint8* src_v, int src_stride_v, 50 int src_width, int src_height, 51 uint8* dst_y, int dst_stride_y, 52 uint8* dst_u, int dst_stride_u, 53 uint8* dst_v, int dst_stride_v, 54 int dst_width, int dst_height, 55 FilterMode filtering); 56 57// Legacy API. Deprecated. 58LIBYUV_API 59int Scale(const uint8* src_y, const uint8* src_u, const uint8* src_v, 60 int src_stride_y, int src_stride_u, int src_stride_v, 61 int src_width, int src_height, 62 uint8* dst_y, uint8* dst_u, uint8* dst_v, 63 int dst_stride_y, int dst_stride_u, int dst_stride_v, 64 int dst_width, int dst_height, 65 bool interpolate); 66 67// Legacy API. Deprecated. 68LIBYUV_API 69int ScaleOffset(const uint8* src, int src_width, int src_height, 70 uint8* dst, int dst_width, int dst_height, int dst_yoffset, 71 bool interpolate); 72 73// For testing, allow disabling of specialized scalers. 74LIBYUV_API 75void SetUseReferenceImpl(bool use); 76 77#ifdef __cplusplus 78} // extern "C" 79} // namespace libyuv 80#endif 81 82#endif // INCLUDE_LIBYUV_SCALE_H_ NOLINT 83