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      1 /*
      2  * Copyright (C) 2011 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 #pragma once
     18 
     19 #include <vector>
     20 #include <iostream>
     21 #include <fstream>
     22 #include <sstream>
     23 #include <memory.h>
     24 
     25 /*!
     26  * Simple class to manipulate PGM/PPM images. Not suitable for heavy lifting.
     27  */
     28 class PgmImage
     29 {
     30     friend std::ostream& operator<< (std::ostream& o, const PgmImage& im);
     31 public:
     32     enum {PGM_BINARY_GRAYMAP,PGM_BINARY_PIXMAP,PGM_FORMAT_INVALID};
     33     /*!
     34     * Constructor from a PGM file name.
     35     */
     36     PgmImage(std::string filename);
     37     /*!
     38     * Constructor to allocate an image of given size and type.
     39     */
     40     PgmImage(int w, int h, int format = PGM_BINARY_GRAYMAP);
     41     /*!
     42     * Constructor to allocate an image of given size and copy the data in.
     43     */
     44     PgmImage(unsigned char *data, int w, int h);
     45     /*!
     46     * Constructor to allocate an image of given size and copy the data in.
     47     */
     48     PgmImage(std::vector<unsigned char> &data, int w, int h);
     49 
     50     PgmImage(const PgmImage &im);
     51 
     52     PgmImage& operator= (const PgmImage &im);
     53     ~PgmImage();
     54 
     55     int GetHeight() const { return m_h; }
     56     int GetWidth() const { return m_w; }
     57 
     58     //! Copy pixels from data pointer
     59     void SetData(const unsigned char * data);
     60 
     61     //! Get a data pointer to unaligned memory area
     62     unsigned char * GetDataPointer() { if ( m_data.size() > 0 ) return &m_data[0]; else return NULL; }
     63     unsigned char ** GetRowPointers() { if ( m_rows.size() == m_h ) return &m_rows[0]; else return NULL; }
     64 
     65     //! Read a PGM file from disk
     66     bool ReadPGM(const std::string filename);
     67     //! Write a PGM file to disk
     68     bool WritePGM(const std::string filename, const std::string comment="");
     69 
     70     //! Get image format (returns PGM_BINARY_GRAYMAP, PGM_BINARY_PIXMAP or PGM_FORMAT_INVALID)
     71     int GetFormat() const { return m_format; }
     72 
     73     //! Set image format (returns PGM_BINARY_GRAYMAP, PGM_BINARY_PIXMAP). Image data becomes invalid.
     74     void SetFormat(int format);
     75 
     76     //! If the image is PGM_BINARY_PIXMAP, convert it to PGM_BINARY_GRAYMAP via Y = 0.3*R + 0.59*G + 0.11*B.
     77     void ConvertToGray();
     78 protected:
     79     // Generic functions:
     80     void DeepCopy(const PgmImage& src, PgmImage& dst);
     81     void SetupRowPointers();
     82 
     83     // PGM data
     84     int m_w;
     85     int m_h;
     86     int m_format;
     87     int m_colors;
     88     int m_over_allocation;
     89     std::vector<unsigned char> m_data;
     90     std::string m_comment;
     91 
     92     std::vector<unsigned char *> m_rows;
     93 };
     94 
     95 std::ostream& operator<< (std::ostream& o, const PgmImage& im);
     96