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 */ 35 enum 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 */ 54 void 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 */ 74 void 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 */ 89 void 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
