PNGGenerator.cc

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#include "PNGGenerator.h"
#include "InterleavedYUVGenerator.h"
#include "Events/DataEvent.h"
#include "Events/EventRouter.h"
#include "Events/FilterBankEvent.h"
#include "Shared/Profiler.h"
#include "Wireless/Socket.h"
#include "Shared/ImageUtil.h"
#include "Shared/debuget.h"

using namespace std; 

PNGGenerator::PNGGenerator(unsigned int mysid, FilterBankGenerator* fbg, EventBase::EventTypeID_t tid)
: FilterBankGenerator("PNGGenerator",EventBase::visPNGEGID,mysid,fbg,tid), srcMode(SRC_AUTO), curMode(SRC_AUTO), bytesUsed(NULL)
{
  if(dynamic_cast<const InterleavedYUVGenerator*>(src)!=NULL)
    curMode=SRC_COLOR;
  else
    curMode=SRC_GRAYSCALE;
  
  //this part is only necessary if you override setNumImages yourself
  if(fbg!=NULL) {
    numLayers=numChannels=0; //this is to force setNumImages to override settings provided by FilterBankGenerator
    setNumImages(fbg->getNumLayers(),fbg->getNumChannels());
  }
}

PNGGenerator::PNGGenerator(unsigned int mysid, src_mode_t mode, FilterBankGenerator* fbg, EventBase::EventTypeID_t tid)
: FilterBankGenerator("PNGGenerator",EventBase::visPNGEGID,mysid,fbg,tid), srcMode(mode), curMode(mode), bytesUsed(NULL)
{
  if(srcMode==SRC_AUTO) {
    if(dynamic_cast<const InterleavedYUVGenerator*>(src)!=NULL)
      curMode=SRC_COLOR;
    else
      curMode=SRC_GRAYSCALE;
  }
  
  //this part is only necessary if you override setNumImages yourself
  if(fbg!=NULL) {
    numLayers=numChannels=0; //this is to force setNumImages to override settings provided by FilterBankGenerator
    setNumImages(fbg->getNumLayers(),fbg->getNumChannels());
  }
}

PNGGenerator::~PNGGenerator() {
  freeCaches();
  destruct();
}


/*! The const casts in this function are regretable but necessary
*  since the corresponding OPEN-R functions require mutable
*  arguments, even though they shouldn't be modifying the data
*/
void
PNGGenerator::doEvent() {
  if(event->getGeneratorID()==getListenGeneratorID() && event->getSourceID()==getListenSourceID()) {
    if(getSourceMode()==SRC_AUTO) { //if not auto, curMode was already set when srcMode was set
      if(dynamic_cast<const InterleavedYUVGenerator*>(src)!=NULL)
        curMode=SRC_COLOR;
      else
        curMode=SRC_GRAYSCALE;
    }
    FilterBankEvent fbkev(this,getGeneratorID(),getSourceID(),EventBase::activateETID);
    erouter->postEvent(fbkev);
    fbkev.setTypeID(EventBase::statusETID);
    erouter->postEvent(fbkev);
    fbkev.setTypeID(EventBase::deactivateETID);
    erouter->postEvent(fbkev);
  }
}

unsigned int
PNGGenerator::getBinSize() const {
  unsigned int used=FilterBankGenerator::getBinSize();
  const char * type;
  if(getCurrentSourceFormat()==SRC_COLOR)
    type="PNGColor";
  else if(getCurrentSourceFormat()==SRC_GRAYSCALE)
    type="PNGGrayscale";
  else {
    serr->printf("getBinSize failed - unsuitable or unknown mode/generator pair");
    return 0;
  }
  used+=strlen(type)+LoadSave::stringpad;
  if(bytesUsed[selectedSaveLayer][selectedSaveChannel]!=0)
    used+=bytesUsed[selectedSaveLayer][selectedSaveChannel];
  else
    used+=widths[selectedSaveLayer]*heights[selectedSaveLayer]*3+PNG_HEADER_PAD;
  return used;
}

unsigned int
PNGGenerator::loadBuffer(const char buf[], unsigned int len, const char* filename) {
  unsigned int origlen=len;
  if(!FilterBankGenerator::loadBuffer(buf,len,filename)) return 0;
  std::string tmp;
  if(!decodeInc(tmp,buf,len)) return 0;
  if(tmp!="PNGColor" && tmp!="PNGGrayscale") {
    serr->printf("Unhandled image type for PNGGenerator: %s",tmp.c_str());
    return 0;
  } else {
    if(tmp=="PNGColor" && getCurrentSourceFormat()==SRC_GRAYSCALE)
      serr->printf("Warning: loading grayscale into color image");
    if(tmp=="PNGGrayscale" && getCurrentSourceFormat()==SRC_COLOR)
      serr->printf("Warning: loading color into grayscale image");
    unsigned int tmpL;
    if(!decodeInc(tmpL,buf,len)) return 0;
    if(tmpL>len)
      return 0;
    if(images[selectedSaveLayer][selectedSaveChannel]!=NULL)
      delete [] images[selectedSaveLayer][selectedSaveChannel];
    images[selectedSaveLayer][selectedSaveChannel]=createImageCache(selectedSaveLayer,selectedSaveChannel);
    unsigned int used=bytesUsed[selectedSaveLayer][selectedSaveChannel]=tmpL;
    unsigned char* img=getImage(selectedSaveLayer,selectedSaveChannel);
    if(img==NULL)
      return 0;
    memcpy(img,buf,used);
    len-=used; buf+=used;
    imageValids[selectedSaveLayer][selectedSaveChannel]=true;
    return origlen-len; 
  }
}

unsigned int
PNGGenerator::saveBuffer(char buf[], unsigned int len) const {
  unsigned int origlen=len;
  if(!checkInc(FilterBankGenerator::saveBuffer(buf,len),buf,len)) return 0;
  
  const char * type;
  if(getCurrentSourceFormat()==SRC_COLOR)
    type="PNGColor";
  else if(getCurrentSourceFormat()==SRC_GRAYSCALE)
    type="PNGGrayscale";
  else {
    serr->printf("saveBuffer failed - unsuitable or unknown mode/generator pair");
    return 0;
  }
  if(!encodeInc(type,buf,len)) return 0;
  
  if(images[selectedSaveLayer][selectedSaveChannel]==NULL) {
    serr->printf("PNGGenerator::saveBuffer() failed because selected image is NULL -- call selectSaveImage first to make sure it's up to date\n");
    return 0;
  }
  if(!imageValids[selectedSaveLayer][selectedSaveChannel]) {
    serr->printf("PNGGenerator::saveBuffer() failed because selected image is invalid -- call selectSaveImage first to make sure it's up to date\n");
    return 0;
  }
  unsigned char* img=images[selectedSaveLayer][selectedSaveChannel];
  if(img==NULL)
    return 0;
  if(!encodeInc(bytesUsed[selectedSaveLayer][selectedSaveChannel],buf,len)) return 0;
  unsigned int used=bytesUsed[selectedSaveLayer][selectedSaveChannel];
  if(used>len)
    return 0;
  memcpy(buf,img,used);
  len-=used;
  return origlen-len;
}

void
PNGGenerator::setNumImages(unsigned int nLayers, unsigned int nChannels) {
  if(nLayers==numLayers && nChannels==numChannels)
    return;
  FilterBankGenerator::setNumImages(nLayers,nChannels);
  for(unsigned int i=0; i<numLayers; i++)
    strides[i]=skips[i]=0;
  bytesUsed=new unsigned int*[numLayers];
  for(unsigned int res=0; res<numLayers; res++) {
    increments[res]=3;
    bytesUsed[res]=new unsigned int[numChannels];
    for(unsigned int i=0; i<numChannels; i++)
      bytesUsed[res][i]=0;
  }
}

unsigned char *
PNGGenerator::createImageCache(unsigned int layer, unsigned int /*chan*/) const {
  return new unsigned char[widths[layer]*heights[layer]*3+PNG_HEADER_PAD];
}

void
PNGGenerator::calcImage(unsigned int layer, unsigned int chan) {
  PROFSECTION("PNGGenerator::calcImage(...)",*mainProfiler);
  
  // input configuration
  char* inbuf = reinterpret_cast<char*>(src->getImage(layer,chan));
  size_t inbufSize = src->getWidth(layer)*src->getIncrement(layer)*src->getHeight(layer);
  size_t srcChans = src->getIncrement(layer);
  
  // output configuration
  ASSERT(images[layer][chan]!=NULL,"image was not allocated");
  char*& outbuf = reinterpret_cast<char*&>(images[layer][chan]);
  size_t outbufSize = widths[layer]*heights[layer]*3+PNG_HEADER_PAD;
  size_t dstChans;
  if(getCurrentSourceFormat()==SRC_COLOR ) {
    dstChans=3;
  } else if(getCurrentSourceFormat()==SRC_GRAYSCALE) {
    dstChans=1;
  } else {
    serr->printf("%s %s Compression failed - unsuitable or unknown mode/generator pair",getClassName().c_str(),getName().c_str());
    return;
  }
  
  // do it!
  bytesUsed[layer][chan] = image_util::encodePNG(inbuf,inbufSize,widths[layer],heights[layer],srcChans,outbuf,outbufSize,dstChans);
  imageValids[layer][chan] = (bytesUsed[layer][chan]!=0);
}

void
PNGGenerator::destruct() {
  FilterBankGenerator::destruct();
  for(unsigned int res=0; res<numLayers; res++)
    delete [] bytesUsed[res];
  delete [] bytesUsed;
  bytesUsed=NULL;
}

/*! @file
 * @brief Implements PNGGenerator, which generates FilterBankEvents containing PNG compressed images
 * @author Ethan Tira-Thompson (ejt) (Creator)
 */