static bool saveImage(const ofPixels_<PixelType> & _pix, ofBuffer & buffer, ofImageFormat format, ofImageQualityType qualityLevel) {
// thanks to alvaro casinelli for the implementation
ofInitFreeImage();
if (_pix.isAllocated() == false){
ofLogError("ofImage","saveImage(): couldn't save to ofBuffer, pixels are not allocated");
return false;
}
if(format==OF_IMAGE_FORMAT_JPEG && (_pix.getNumChannels()==4 || _pix.getBitsPerChannel() > 8)){
ofPixels pix3 = _pix;
pix3.setNumChannels(3);
return saveImage(pix3,buffer,format,qualityLevel);
}
FIBITMAP * bmp = nullptr;
#ifdef TARGET_LITTLE_ENDIAN
if(sizeof(PixelType) == 1 && (_pix.getPixelFormat()==OF_PIXELS_RGB || _pix.getPixelFormat()==OF_PIXELS_RGBA)) { // Make a local copy.
ofPixels_<PixelType> pix = _pix;
pix.swapRgb();
bmp = getBmpFromPixels(pix);
}else{
#endif
bmp = getBmpFromPixels(_pix);
#ifdef TARGET_LITTLE_ENDIAN
}
#endif
if (bmp) // bitmap successfully created
{
bool returnValue;
// (b) open a memory stream to compress the image onto mem_buffer:
//
FIMEMORY *hmem = FreeImage_OpenMemory();
// (c) encode and save the image to the memory (on dib FIBITMAP image):
//
if(FREE_IMAGE_FORMAT(format) == FIF_JPEG) {
int quality = JPEG_QUALITYSUPERB;
switch(qualityLevel) {
case OF_IMAGE_QUALITY_WORST: quality = JPEG_QUALITYBAD; break;
case OF_IMAGE_QUALITY_LOW: quality = JPEG_QUALITYAVERAGE; break;
case OF_IMAGE_QUALITY_MEDIUM: quality = JPEG_QUALITYNORMAL; break;
case OF_IMAGE_QUALITY_HIGH: quality = JPEG_QUALITYGOOD; break;
case OF_IMAGE_QUALITY_BEST: quality = JPEG_QUALITYSUPERB; break;
}
returnValue = FreeImage_SaveToMemory(FIF_JPEG, bmp, hmem, quality);
}else{
returnValue = FreeImage_SaveToMemory((FREE_IMAGE_FORMAT)format, bmp, hmem);
}
/*
NOTE: at this point, hmem contains the entire data in memory stored in fif format. the
amount of space used by the memory is equal to file_size:
long file_size = FreeImage_TellMemory(hmem);
but can also be retrieved by FreeImage_AcquireMemory that retrieves both the
length of the buffer, and the buffer memory address.
*/
#ifdef TARGET_WIN32
DWORD size_in_bytes = 0;
#else
std::uint32_t size_in_bytes = 0;
#endif
// Save compressed data on mem_buffer
// note: FreeImage_AquireMemory allocates space for aux_mem_buffer):
//
unsigned char *mem_buffer = nullptr;
if (!FreeImage_AcquireMemory(hmem, &mem_buffer, &size_in_bytes)){
ofLogError("ofImage") << "saveImage(): couldn't save to ofBuffer, aquiring compressed image from memory failed";
return false;
}
/*
Now, before closing the memory stream, copy the content of mem_buffer
to an auxiliary buffer
*/
buffer.set((char*)mem_buffer,size_in_bytes);
// Finally, close the FIBITMAP object, or we will get a memory leak:
FreeImage_Unload(bmp);
// Close the memory stream (otherwise we may get a memory leak).
FreeImage_CloseMemory(hmem);
return returnValue;
}else{
return false;
}
}
static bool saveImage(const ofPixels_<PixelType> & _pix, const std::filesystem::path& _fileName, ofImageQualityType qualityLevel) {
ofInitFreeImage();
if (_pix.isAllocated() == false){
ofLogError("ofImage") << "saveImage(): couldn't save \"" << _fileName << "\", pixels are not allocated";
return false;
}
ofFilePath::createEnclosingDirectory(_fileName);
std::string fileName = ofToDataPath(_fileName);
FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
fif = FreeImage_GetFileType(fileName.c_str(), 0);
if(fif == FIF_UNKNOWN) {
// or guess via filename
fif = FreeImage_GetFIFFromFilename(fileName.c_str());
}
if(fif==FIF_JPEG && (_pix.getNumChannels()==4 || _pix.getBitsPerChannel() > 8)){
ofPixels pix3 = _pix;
pix3.setNumChannels(3);
return saveImage(pix3,_fileName,qualityLevel);
}
FIBITMAP * bmp = nullptr;
#ifdef TARGET_LITTLE_ENDIAN
if(sizeof(PixelType) == 1 && (_pix.getPixelFormat()==OF_PIXELS_RGB || _pix.getPixelFormat()==OF_PIXELS_RGBA)) { // Make a local copy.
ofPixels_<PixelType> pix = _pix;
pix.swapRgb();
bmp = getBmpFromPixels(pix);
}else{
#endif
bmp = getBmpFromPixels(_pix);
#ifdef TARGET_LITTLE_ENDIAN
}
#endif
bool retValue = false;
if((fif != FIF_UNKNOWN) && FreeImage_FIFSupportsReading(fif)) {
if(fif == FIF_JPEG) {
int quality = JPEG_QUALITYSUPERB;
switch(qualityLevel) {
case OF_IMAGE_QUALITY_WORST: quality = JPEG_QUALITYBAD; break;
case OF_IMAGE_QUALITY_LOW: quality = JPEG_QUALITYAVERAGE; break;
case OF_IMAGE_QUALITY_MEDIUM: quality = JPEG_QUALITYNORMAL; break;
case OF_IMAGE_QUALITY_HIGH: quality = JPEG_QUALITYGOOD; break;
case OF_IMAGE_QUALITY_BEST: quality = JPEG_QUALITYSUPERB; break;
}
retValue = FreeImage_Save(fif, bmp, fileName.c_str(), quality);
} else {
if(qualityLevel != OF_IMAGE_QUALITY_BEST) {
ofLogWarning("ofImage") << "saveImage(): ofImageCompressionType only applies to JPEGs,"
<< " ignoring value for \" "<< fileName << "\"";
}
if (fif == FIF_GIF) {
FIBITMAP* convertedBmp;
if(_pix.getImageType() == OF_IMAGE_COLOR_ALPHA) {
// this just converts the image to grayscale so it can save something
convertedBmp = FreeImage_ConvertTo8Bits(bmp);
} else {
// this will create a 256-color palette from the image
convertedBmp = FreeImage_ColorQuantize(bmp, FIQ_NNQUANT);
}
retValue = FreeImage_Save(fif, convertedBmp, fileName.c_str());
if (convertedBmp != nullptr){
FreeImage_Unload(convertedBmp);
}
} else {
retValue = FreeImage_Save(fif, bmp, fileName.c_str());
}
}
}
if (bmp != nullptr){
FreeImage_Unload(bmp);
}
return retValue;
}