[37] | 1 | //-*-c++-*- |
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| 2 | |
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| 3 | #ifndef _PNM_H |
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| 4 | #define _PNM_H |
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| 5 | |
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| 6 | #include "Rectify/Ops.h" |
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| 7 | |
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| 8 | #include <iostream> |
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| 9 | #include <string> |
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| 10 | |
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| 11 | class PNMLoadSave { |
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| 12 | |
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| 13 | private: |
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| 14 | |
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| 15 | // Skip over spaces and comments; temp is the current file character |
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| 16 | static void SkipSpaces(std::ifstream& file, signed char& temp) |
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| 17 | { |
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| 18 | while (temp == ' ' || temp == '\t' || temp == '\n' || temp == '#') |
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| 19 | { |
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| 20 | if (file.eof()) |
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| 21 | return; |
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| 22 | if (temp == '#') // skip this line: |
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| 23 | while ((temp != '\n') && (temp != EOF)) |
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| 24 | temp=file.get(); |
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| 25 | // skip this `whitespace' byte: |
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| 26 | temp=file.get(); |
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| 27 | } |
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| 28 | } |
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| 29 | |
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| 30 | // Get an integer from the file stream; temp is the current file character |
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| 31 | static int ReadInteger(std::ifstream& file, signed char& temp) |
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| 32 | { |
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| 33 | int n = 0; |
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| 34 | bool neg=false; |
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| 35 | while (((temp >= '0') && (temp <= '9')) || (temp == '-')) |
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| 36 | { |
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| 37 | if (file.eof()) |
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| 38 | return 0; |
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| 39 | if (temp=='-') |
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| 40 | neg=true; |
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| 41 | n *= 10; n += (temp - '0'); |
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| 42 | temp=file.get(); |
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| 43 | } |
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| 44 | if (neg) |
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| 45 | n=-n; |
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| 46 | return n; |
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| 47 | } |
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| 48 | |
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| 49 | struct pgm_image_header |
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| 50 | { |
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| 51 | char magic_number[2]; // magic number |
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| 52 | int height; // number of scan lines |
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| 53 | int width; // scan line length |
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| 54 | int maxval; |
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| 55 | }; |
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| 56 | |
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| 57 | public: |
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| 58 | |
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| 59 | /// Load the image in the given filename. If succeeds, image is filled and returns true. Returns false otherwise |
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| 60 | template <class DataT> |
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| 61 | static bool LoadImage(const std::string &filename, Image::Image<DataT> &image) { |
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| 62 | // assume filename already verified |
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| 63 | std::ifstream file(filename.c_str(), std::ios::in | std::ios::binary); |
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| 64 | if (!file) { |
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| 65 | std::cerr << "Couldn't open file '" << filename << "' for reading image" << std::endl; |
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| 66 | exit(1); |
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| 67 | } |
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| 68 | |
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| 69 | unsigned int xsize, ysize, bitspp, magicnumber; |
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| 70 | bool colour; |
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| 71 | |
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| 72 | colour=false; // PGM is greyscale by default |
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| 73 | signed char temp; |
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| 74 | |
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| 75 | /** READ THE HEADER **/ |
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| 76 | |
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| 77 | //This method assumes the PGM header is in the following format |
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| 78 | //P[25] |
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| 79 | //#comments |
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| 80 | //#up to any amount of comments (including no comments) |
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| 81 | //width height |
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| 82 | //maxval |
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| 83 | file.seekg(0, std::ios::beg); |
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| 84 | //Because PGM Image files can contain an unlimited number of |
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| 85 | //comments, this method of reading in the header is infeasible |
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| 86 | //It was left in to read in the magic number |
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| 87 | pgm_image_header header; |
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| 88 | file.read((char*)(&header), sizeof(header)); |
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| 89 | |
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| 90 | if ((header.magic_number[0]!='P') || (!file)) { |
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| 91 | std::cerr << "Couldn't open image file! " << std::endl; |
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| 92 | exit(1); |
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| 93 | } |
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| 94 | magicnumber=header.magic_number[1]-'0'; |
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| 95 | if (magicnumber!=2 && magicnumber!=3 && magicnumber!=5 && magicnumber!=6) { |
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| 96 | std::cerr << "Couldn't open pnm image file because found bad magic number: only 2,3,5,6 recognised" << std::endl; |
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| 97 | exit(1); |
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| 98 | } |
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| 99 | |
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| 100 | file.seekg(3, std::ios::beg); |
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| 101 | temp=file.get(); |
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| 102 | |
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| 103 | //Skip over spaces and comments |
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| 104 | SkipSpaces(file,temp); |
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| 105 | //Read in Width |
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| 106 | xsize=(unsigned int)ReadInteger(file,temp); |
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| 107 | //Skip over spaces and comments |
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| 108 | SkipSpaces(file,temp); |
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| 109 | //Read in Height |
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| 110 | ysize=ReadInteger(file,temp); |
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| 111 | //Skip over spaces and comments |
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| 112 | SkipSpaces(file,temp); |
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| 113 | //Read in Maxval |
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| 114 | unsigned int maxval=ReadInteger(file,temp); |
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| 115 | |
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| 116 | if (temp == ' ' || temp == '\t' || temp == '\n') |
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| 117 | temp=file.get(); |
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| 118 | |
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| 119 | // Step the file back one. |
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| 120 | file.seekg(-1,std::ios::cur); |
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| 121 | |
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| 122 | if (maxval==0) |
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| 123 | bitspp=8; |
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| 124 | else |
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| 125 | { |
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| 126 | bitspp=0; |
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| 127 | while (maxval>0) |
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| 128 | { |
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| 129 | bitspp++; maxval=maxval>>1; |
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| 130 | } |
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| 131 | } |
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| 132 | |
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| 133 | /** DONE READING THE HEADER **/ |
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| 134 | |
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| 135 | if (magicnumber==3 || magicnumber==6) { |
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| 136 | // Colour so must have 3 of those samples per pixel |
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| 137 | bitspp=bitspp*3; |
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| 138 | colour=true; |
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| 139 | } |
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| 140 | |
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| 141 | image.resize(xsize, ysize, colour); |
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| 142 | |
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| 143 | // Every image should have 1D access unless the image class is written by a retard |
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| 144 | // However, I'm going to assume retard level and simply assume a 1D block for the image at (0,0) |
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| 145 | // so don't add unnecesary functions to Image.h and freak those retards out |
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| 146 | if (magicnumber==2) |
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| 147 | { |
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| 148 | DataT TempStore; |
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| 149 | DataT *oiter=&(image(0,0)), *containerend=oiter+(xsize*ysize); |
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| 150 | |
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| 151 | while (!file.eof() && oiter!=containerend) { |
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| 152 | // Problems with my gcc unless copy to a temp - probably optimisations or something |
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| 153 | file >> TempStore; |
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| 154 | *oiter++=TempStore; |
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| 155 | } |
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| 156 | } |
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| 157 | if (magicnumber==3) |
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| 158 | { |
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| 159 | DataT R,G,B; |
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| 160 | |
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| 161 | DataT *oiter=&(image(0,0)), *containerend=oiter+(xsize*ysize); |
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| 162 | while (!file.eof() && oiter!=containerend) { |
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| 163 | file >> R >> G >> B; |
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| 164 | *oiter++=(R<<16)+(G<<8)+B; |
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| 165 | } |
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| 166 | } |
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| 167 | if (magicnumber==5) |
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| 168 | { |
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| 169 | DataT *oiter=&(image(0,0)), *containerend=oiter+(xsize*ysize); |
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| 170 | while (!file.eof() && oiter!=containerend) |
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| 171 | *oiter++=file.get(); |
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| 172 | } |
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| 173 | if (magicnumber==6) |
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| 174 | { |
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| 175 | DataT *oiter=&(image(0,0)), *containerend=oiter+(xsize*ysize); |
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| 176 | while (!file.eof() && oiter!=containerend) |
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| 177 | *oiter++=(file.get()<<16)+(file.get()<<8)+file.get(); |
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| 178 | } |
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| 179 | |
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| 180 | if (!(file.good()) && !(file.eof())) |
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| 181 | return false; |
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| 182 | |
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| 183 | return true; |
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| 184 | } |
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| 185 | |
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| 186 | // Save an image to the given file. |
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| 187 | template <class DataT> |
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| 188 | static void SaveImage(const std::string &filename, const Image::Image<DataT> &image) { |
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| 189 | std::ofstream file(filename.c_str(), std::ios::out | std::ios::binary); |
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| 190 | if (!file) { |
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| 191 | std::cerr << "Couldn't open file '" << filename << "' for writing image" << std::endl; |
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| 192 | exit(1); |
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| 193 | } |
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| 194 | |
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| 195 | if (!image.isColour()) { |
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| 196 | DataT maxval=0; |
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| 197 | // Get bits per pixel for container based on max value if greyscale |
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| 198 | for (size_t x=0;x<image.xsize();++x) { |
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| 199 | for (size_t y=0;y<image.ysize();++y) { |
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| 200 | if (image(x,y)>maxval) |
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| 201 | maxval=image(x,y); |
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| 202 | } |
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| 203 | } |
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| 204 | // Get bits per pixel based on maximum value in the image |
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| 205 | unsigned int bpp=0; |
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| 206 | while (maxval>0) { |
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| 207 | ++bpp; |
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| 208 | maxval=maxval>>1; |
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| 209 | } |
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| 210 | |
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| 211 | // Write magic number. |
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| 212 | if (bpp==8) |
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| 213 | file << "P5" << std::endl; |
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| 214 | else |
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| 215 | file << "P2" << std::endl; |
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| 216 | |
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| 217 | // Write comments |
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| 218 | file << "# Created by some nice code" << std::endl; |
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| 219 | |
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| 220 | // Write Height and Width |
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| 221 | file << (unsigned int)image.xsize() << " " << (unsigned int)image.ysize() << std::endl; |
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| 222 | |
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| 223 | // Write max val |
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| 224 | if (bpp<32) |
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| 225 | file << (1<<bpp)-1 << std::endl; |
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| 226 | else |
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| 227 | file << UINT_MAX << std::endl; |
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| 228 | |
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| 229 | if (bpp==8) { |
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| 230 | char *buffer=new char[image.xsize()*image.ysize()]; |
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| 231 | char *iter=buffer; |
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| 232 | for (size_t y=0;y<image.ysize();++y) |
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| 233 | for (size_t x=0;x<image.xsize();++x) |
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| 234 | *iter++=image(x,y); |
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| 235 | file.write(buffer, ((std::streamsize)(image.xsize()*image.ysize()))); |
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| 236 | delete[] buffer; |
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| 237 | } |
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| 238 | else |
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| 239 | { |
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| 240 | for (size_t y=0;y<image.ysize();++y) |
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| 241 | for (size_t x=0;x<image.xsize();++x) |
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| 242 | file << image(x,y) << std::endl; |
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| 243 | } |
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| 244 | } |
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| 245 | else |
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| 246 | { |
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| 247 | |
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| 248 | file << "P6" << std::endl; |
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| 249 | |
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| 250 | // Write comments |
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| 251 | file << "# Created by some nice code" << std::endl; |
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| 252 | |
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| 253 | // Write Height and Width |
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| 254 | file << (unsigned int)image.xsize() << " " << (unsigned int)image.ysize() << std::endl; |
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| 255 | |
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| 256 | // Write max val |
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| 257 | file << "255" << std::endl; |
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| 258 | |
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| 259 | for (size_t y=0;y<image.ysize();++y) |
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| 260 | for (size_t x=0;x<image.xsize();++x) { |
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| 261 | DataT imval=image(x,y); |
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| 262 | file.put((imval & (255<<16))>>16); |
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| 263 | file.put((imval & (255<<8))>>8); |
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| 264 | file.put(imval & 255); |
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| 265 | } |
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| 266 | } |
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| 267 | |
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| 268 | if (!file) { |
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| 269 | std::cerr << "Filesystem error whilst writing image: " << filename << std::endl; |
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| 270 | exit(1); |
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| 271 | } |
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| 272 | |
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| 273 | return; |
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| 274 | |
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| 275 | } |
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| 276 | |
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| 277 | }; |
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| 278 | |
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| 279 | #endif |
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