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PNGGenerator.h Go to the documentation of this file. //-*-c++-*- #ifndef INCLUDED_PNGGenerator_h_ #define INCLUDED_PNGGenerator_h_ #include "Vision/FilterBankGenerator.h" #include <png.h> extern "C" { void user_write_png_data(png_structp png_ptr, png_bytep data, png_size_t length); } //! Generates FilterBankEvents containing PNG compressed images /*! * This class shares a lot of non-PNG specific code with JPEGGenerator, * so you may want to replicate any changes made in that class as well. * * @todo create a common super class with JPEGGenerator to hold common setup code */ class PNGGenerator : public FilterBankGenerator { public: static const unsigned int PNG_HEADER_PAD=500; //!< add a bit to the expected size in getBinSize just to leave a little extra room for small images //! defines how to interpret the source images (see #srcMode and #curMode) enum src_mode_t { SRC_AUTO, //!< if src is not a InterleavedYUVGenerator, SRC_GREYSCALE, otherwise SRC_COLOR SRC_GRAYSCALE, //!< indicates each channel of source should be compressed individually as grayscale images SRC_COLOR //!< indicates first channel should be in an interleaved layout which can be compressed into a "color" image }; //! constructor PNGGenerator(unsigned int mysid, FilterBankGenerator* fbg, EventBase::EventTypeID_t tid); //! constructor PNGGenerator(unsigned int mysid, PNGGenerator::src_mode_t sMode, FilterBankGenerator* fbg, EventBase::EventTypeID_t tid); //! destructor virtual ~PNGGenerator(); //! set #srcMode and #curMode as well if @a mode==SRC_AUTO virtual void setSourceMode(src_mode_t mode) { srcMode=mode; if(mode!=SRC_AUTO) curMode=mode;} //! returns #srcMode virtual src_mode_t getSourceMode() const { return srcMode; } //! returns #curMode virtual src_mode_t getCurrentSourceFormat() const { return curMode; } static std::string getClassDescription() { return "Compresses its source FilterBankGenerator's data into PNG format"; } //! should receive FilterBankEvents from a RawCameraGenerator (or a subclass thereof) virtual void processEvent(const EventBase& event); //! if we don't already know bytesUsed, let's assume the size will be smaller than the original uncompressed. If we fail this assumption, probably better to fail anyway. virtual unsigned int getBinSize() const; virtual unsigned int loadBuffer(const char buf[], unsigned int len); //! you probably don't want to be calling this to access the PNG -- use getImage() instead (saveBuffer will prepend some header information before the actual image data) virtual unsigned int saveBuffer(char buf[], unsigned int len) const; //! returns the number of bytes used for the image returned by getImage() - will return 0 if the image hasn't been calculated yet (so call it @e after getImage()) virtual unsigned int getImageSize(unsigned int layer, unsigned int chan) const { return bytesUsed[layer][chan]; } protected: virtual void setNumImages(unsigned int nLayers, unsigned int nChannels); virtual unsigned char * createImageCache(unsigned int layer, unsigned int chan) const; virtual void calcImage(unsigned int layer, unsigned int chan); virtual void destruct(); src_mode_t srcMode; //!< how to interpret source channel of next filter bank event src_mode_t curMode; //!< how to interpret getImage's current image unsigned int ** bytesUsed; //!< number of bytes used per image to actually store data; private: PNGGenerator(const PNGGenerator& fbk); //!< don't call const PNGGenerator& operator=(const PNGGenerator& fbk); //!< don't call }; /*! @file * @brief Describes PNGGenerator, which generates FilterBankEvents containing PNG compressed images * @author Ethan Tira-Thompson (ejt) (Creator) * * $Author: ejt $ * $Name: tekkotsu-3_0 $ * $Revision: 1.3 $ * $State: Exp $ * $Date: 2006/09/16 17:32:40 $ */ #endif

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