1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef bim_FUNCTIONS_EM_H
18#define bim_FUNCTIONS_EM_H
19
20/**
21 * This files contains gerenral purpose functions.
22 */
23
24/* ---- includes ----------------------------------------------------------- */
25
26#include "b_BasicEm/UInt8Arr.h"
27#include "b_TensorEm/Functions.h"
28#include "b_TensorEm/Flt16Alt2D.h"
29
30/* ---- related objects  --------------------------------------------------- */
31
32/* ---- typedefs ----------------------------------------------------------- */
33
34/** pyramidal image type */
35enum bim_PyramidalImageType
36{
37	bim_UINT8_PYRAMIDAL_IMG,	/* byte representation of pyramical image */
38	bim_UINT16_PYRAMIDAL_IMG	/* 16-bit representation of pyramical image */
39};
40
41/* ---- constants ---------------------------------------------------------- */
42
43/* ---- external functions ------------------------------------------------- */
44
45/** Warps an image with intermediate pyramidal downscaling if possible in order to minimize aliasing
46 *  The actual warping happens using pixel interpolation
47 *  *bufPtrA is an intermediate byte array that holds downscaled data (only needed when pyramidal downscaling happens; can be NULL otherwise)
48 *  scaleThresholdA (16.16):
49 *		specifies the minimum scale ratio (inImage/outImage) required to initiate prior filtering
50 *      A value range of 2.0...4.0 is recommended (<= 0.0: disabled)
51 *
52 *  offsPtrA specifies the pixel position (0,0) in the input image (format 16.0)
53 */
54void bim_filterWarpInterpolation( struct bbs_Context* cpA,
55								  uint8* dstImagePtrA,
56								  const uint8* srcImagePtrA,
57								  uint32 srcImageWidthA,
58								  uint32 srcImageHeightA,
59								  const struct bts_Int16Vec2D* offsPtrA,
60								  const struct bts_Flt16Alt2D* altPtrA,
61								  uint32 dstWidthA,
62								  uint32 dstHeightA,
63								  struct bbs_UInt8Arr* bufPtrA,
64								  uint32 scaleThresholdA );
65
66/** Warps an image with intermediate pyramidal downscaling if possible in order to minimize aliasing
67 *  The actual warping happens using pixel replication (fast but prone to artefacts)
68 *  *bufPtrA is an intermediate byte array that holds downscaled data (only needed when pyramidal downscaling happens; can be NULL otherwise)
69 *  scaleThresholdA (16.16):
70 *		specifies the minimum scale ratio (inImage/outImage) required to initiate prior filtering
71 *      A value range of 2.0...4.0 is recommended (0.0: disabled)
72 *  offsPtrA specifies the pixel position (0,0) in the input image (format 16.0)
73 */
74void bim_filterWarpPixelReplication( struct bbs_Context* cpA,
75									 uint8* dstImagePtrA,
76									 const uint8* srcImagePtrA,
77									 uint32 srcImageWidthA,
78									 uint32 srcImageHeightA,
79								     const struct bts_Int16Vec2D* offsPtrA,
80									 const struct bts_Flt16Alt2D* altPtrA,
81									 uint32 dstWidthA,
82									 uint32 dstHeightA,
83									 struct bbs_UInt8Arr* bufPtrA,
84									 uint32 scaleThresholdA );
85
86/** Selects proper warp function above
87 *  offsPtrA specifies the pixel position (0,0) in the input image (format 16.0)
88 */
89void bim_filterWarp( struct bbs_Context* cpA,
90					 uint8* dstImagePtrA,
91					 const uint8* srcImagePtrA,
92					 uint32 srcImageWidthA,
93					 uint32 srcImageHeightA,
94  				     const struct bts_Int16Vec2D* offsPtrA,
95					 const struct bts_Flt16Alt2D* altPtrA,
96					 uint32 dstWidthA,
97					 uint32 dstHeightA,
98					 struct bbs_UInt8Arr* bufPtrA,
99					 uint32 scaleThresholdA,
100					 flag interpolateA );
101
102#endif /* bim_FUNCTIONS_EM_H */
103
104