C++ ofPixels_::isAllocated方法代码示例

bool ofPixels_<PixelType>::pasteInto(ofPixels_<PixelType> &dst, int xTo, int yTo) const{
	if (!(isAllocated()) || !(dst.isAllocated()) || getBytesPerPixel() != dst.getBytesPerPixel() || xTo + getWidth()>dst.getWidth() || yTo + getHeight()>dst.getHeight()) return false;

	int bytesToCopyPerRow = (xTo + getWidth()<=dst.getWidth() ? getWidth() : dst.getWidth()-xTo) * getBytesPerPixel();
	int columnsToCopy = yTo + getHeight() <= dst.getHeight() ? getHeight() : dst.getHeight()-yTo;
	PixelType * dstPix = dst.getData() + ((xTo + yTo*dst.getWidth())*dst.getBytesPerPixel());
	const PixelType * srcPix = getData();
	int srcStride = getWidth()*getBytesPerPixel();
	int dstStride = dst.getWidth()*dst.getBytesPerPixel();

	for(int y=0;y<columnsToCopy; y++){
		memcpy(dstPix,srcPix,bytesToCopyPerRow);
		dstPix += dstStride;
		srcPix += srcStride;
	}

	return true;
}

bool ofPixels_<PixelType>::blendInto(ofPixels_<PixelType> &dst, int xTo, int yTo) const{
	if (!(isAllocated()) || !(dst.isAllocated()) || getBytesPerPixel() != dst.getBytesPerPixel() || xTo + getWidth()>dst.getWidth() || yTo + getHeight()>dst.getHeight() || getNumChannels()==0) return false;

	std::function<void(const ConstPixel&,Pixel&)> blendFunc;
	switch(getNumChannels()){
	case 1:
		blendFunc = [](const ConstPixel&src, Pixel&dst){
			dst[0] = clampedAdd(src[0], dst[0]);
		};
		break;
	case 2:
		blendFunc = [](const ConstPixel&src, Pixel&dst){
			dst[0] = clampedAdd(src[0], dst[0] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[1]));
			dst[1] = clampedAdd(src[1], dst[1] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[1]));
		};
		break;
	case 3:
		blendFunc = [](const ConstPixel&src, Pixel&dst){
			dst[0] = clampedAdd(src[0], dst[0]);
			dst[1] = clampedAdd(src[1], dst[1]);
			dst[2] = clampedAdd(src[2], dst[2]);
		};
		break;
	case 4:
		blendFunc = [](const ConstPixel&src, Pixel&dst){
			dst[0] = clampedAdd(src[0], dst[0] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[3]));
			dst[1] = clampedAdd(src[1], dst[1] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[3]));
			dst[2] = clampedAdd(src[2], dst[2] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[3]));
			dst[3] = clampedAdd(src[3], dst[3] / ofColor_<PixelType>::limit() * (ofColor_<PixelType>::limit() - src[3]));
		};
		break;
	}
	auto dstLine = dst.getLine(yTo);
	for(auto line: getConstLines()){
		auto dstPixel = dstLine.getPixels().begin() + xTo;
		for(auto p: line.getPixels()){
			blendFunc(p,dstPixel);
			dstPixel++;
		}
		dstLine++;
	}

	return true;
}

static void saveImage(ofPixels_<PixelType> & pix, ofBuffer & buffer, ofImageFormat format, ofImageQualityType qualityLevel) {
	//thanks to alvaro casinelli for the implementation

	ofInitFreeImage();

	if (pix.isAllocated() == false){
		ofLog(OF_LOG_ERROR,"error saving image - pixels aren't allocated");
		return;
	}

	#ifdef TARGET_LITTLE_ENDIAN
	if(sizeof(PixelType) == 1) {
		pix.swapRgb();
	}
	#endif

	FIBITMAP * bmp	= getBmpFromPixels(pix);

	#ifdef TARGET_LITTLE_ENDIAN
	if(sizeof(PixelType) == 1) {
		pix.swapRgb();
	}
	#endif

	if (bmp)  // bitmap successfully created
	{
		   // (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;
				}
				FreeImage_SaveToMemory(FIF_JPEG, bmp, hmem, quality);
		   }else{
				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
		   	   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 = NULL;
		   if (!FreeImage_AcquireMemory(hmem, &mem_buffer, &size_in_bytes))
				   cout << "Error aquiring compressed image from memory" << endl;

		   /*
			  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);
	}
}

void ofPixels_<PixelType>::copyFrom(const ofPixels_<PixelType> & mom){
	if(mom.isAllocated()) {
		allocate(mom.getWidth(), mom.getHeight(), mom.getPixelFormat());
		memcpy(pixels, mom.getData(), getTotalBytes());
	}
}

void ofPixels_<PixelType>::copyFrom(const ofPixels_<PixelType> & mom){
	if(mom.isAllocated()) {
		allocate(mom.getWidth(), mom.getHeight(), mom.getNumChannels());
		memcpy(pixels, mom.getPixels(), mom.getWidth() * mom.getHeight() * mom.getBytesPerPixel());
	}
}

static void saveImage(ofPixels_<PixelType> & pix, string fileName, ofImageQualityType qualityLevel) {
	ofInitFreeImage();
	if (pix.isAllocated() == false){
		ofLogError("ofImage") << "saveImage(): couldn't save \"" << fileName << "\", pixels are not allocated";
		return;
	}

	#ifdef TARGET_LITTLE_ENDIAN
	if(sizeof(PixelType) == 1 && (pix.getPixelFormat()==OF_PIXELS_RGB || pix.getPixelFormat()==OF_PIXELS_RGBA)) {
		pix.swapRgb();
	}
	#endif

	FIBITMAP * bmp	= getBmpFromPixels(pix);

	#ifdef TARGET_LITTLE_ENDIAN
	if(sizeof(PixelType) == 1 && (pix.getPixelFormat()==OF_PIXELS_BGR || pix.getPixelFormat()==OF_PIXELS_BGRA)) {
		pix.swapRgb();
	}
	#endif
	
	ofFilePath::createEnclosingDirectory(fileName);
	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_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;
			}
			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);
				}
				FreeImage_Save(fif, convertedBmp, fileName.c_str());
				if (convertedBmp != nullptr){
					FreeImage_Unload(convertedBmp);
				}
			} else {
				FreeImage_Save(fif, bmp, fileName.c_str());
			}
		}
	}

	if (bmp != nullptr){
		FreeImage_Unload(bmp);
	}
}

void ofPixels_<PixelType>::copyFrom(const ofPixels_<PixelType> & mom){
	if(mom.isAllocated()) {
		allocate(mom.getWidth(), mom.getHeight(), mom.getPixelFormat());
		memcpy(pixels, mom.getPixels(), mom.size() * sizeof(PixelType));
	}
}

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;
	}
}