C++ FreeImage_GetFIFFromFilename函数代码示例

  void storeFreeImage(const Ref<Image>& img, const FileName& fileName)
  {
      FIBITMAP* dib = FreeImage_Allocate((int)img->width, (int)img->height, 24);

      for(size_t y = 0; y < img->height; y++)
      {
          for(size_t x = 0; x < img->width; x++)
          {
			  Color4 c = img->get(x, y);
              
              RGBQUAD Value = {0};
              Value.rgbRed   = (BYTE)(clamp(c.r) * 255.0f);
              Value.rgbGreen = (BYTE)(clamp(c.g) * 255.0f);
              Value.rgbBlue  = (BYTE)(clamp(c.b) * 255.0f);

              FreeImage_SetPixelColor(dib, (unsigned int)x, (unsigned int)y, &Value);
          }
      }

      FIBITMAP* fiLogo = loadWatermark();

      unsigned int LogoWidth  = FreeImage_GetWidth (fiLogo);
      unsigned int LogoHeight = FreeImage_GetHeight(fiLogo);

      if(LogoWidth > img->width || LogoHeight > img->height)
      {
          FreeImage_Unload(fiLogo);

          FREE_IMAGE_FORMAT fif = FreeImage_GetFIFFromFilename(fileName.c_str());
          if(FreeImage_FIFSupportsWriting(fif))
              FreeImage_Save(fif, dib, fileName.c_str());

          FreeImage_Unload(dib);
      }
      else
      {
          int x_pos = (int)img->width  - LogoWidth;
          int y_pos = (int)img->height - LogoHeight;

          FIBITMAP* fiFG = FreeImage_Allocate((int)img->width, (int)img->height, 32);
          BOOL b = FreeImage_Paste(fiFG, fiLogo, x_pos, y_pos, 255);
          FreeImage_Unload(fiLogo);

          FIBITMAP* fiNew = FreeImage_Composite(fiFG, FALSE, NULL, dib);
          FreeImage_Unload(dib);

          FREE_IMAGE_FORMAT fif = FreeImage_GetFIFFromFilename(fileName.c_str());

          int save_flags = 0;
          if(fif == FIF_JPEG)
              save_flags = JPEG_QUALITYSUPERB | JPEG_BASELINE | JPEG_OPTIMIZE;

          if(FreeImage_FIFSupportsWriting(fif))
              FreeImage_Save(fif, fiNew, fileName.c_str(), save_flags);

          FreeImage_Unload(fiNew);
      }
  }

		GLubyte* Texture::loadToBitmap(std::string path, bool flip)
		{
			const char* pathCStr = path.c_str();

			FREE_IMAGE_FORMAT format = FIF_UNKNOWN;
			format = FreeImage_GetFileType(pathCStr);
			if (format == FIF_UNKNOWN)
				format = FreeImage_GetFIFFromFilename(pathCStr);
			if (format == FIF_UNKNOWN) {
				std::cout << "Failed to load image at " << pathCStr << std::endl;
				return nullptr;
			}
			if (!FreeImage_FIFSupportsReading(format))
			{
				std::cout << "Detected image format cannot be read! " << pathCStr << std::endl;
				return nullptr;
			}

			m_bitmap = FreeImage_Load(format, pathCStr);
			if (flip)
				FreeImage_FlipVertical(m_bitmap);

			GLint bitsPerPixel = FreeImage_GetBPP(m_bitmap);
			if (bitsPerPixel == 32)
				m_bitmap32 = m_bitmap;
			else
				m_bitmap32 = FreeImage_ConvertTo32Bits(m_bitmap);

			m_width = FreeImage_GetWidth(m_bitmap32);
			m_height = FreeImage_GetHeight(m_bitmap32);

			return FreeImage_GetBits(m_bitmap32);
		}

bool LoadTexture(const char* filename,	//where to load the file from
	GLuint &texID,
	//does not have to be generated with glGenTextures
	GLenum image_format,		//format the image is in
	GLint internal_format,		//format to store the image in
	GLint level ,					//mipmapping level
	GLint border ) {
	//image format
	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
	//pointer to the image, once loaded
	FIBITMAP *dib(0);
	//pointer to the image data
	BYTE* bits(0);
	//image width and height
	unsigned int width(0), height(0);

	//check the file signature and deduce its format
	fif = FreeImage_GetFileType(filename, 0);
	//if still unknown, try to guess the file format from the file extension
	if (fif == FIF_UNKNOWN)
		fif = FreeImage_GetFIFFromFilename(filename);
	//if still unkown, return failure
	if (fif == FIF_UNKNOWN)
		return false;

	//check that the plugin has reading capabilities and load the file
	if (FreeImage_FIFSupportsReading(fif))
		dib = FreeImage_Load(fif, filename);
	//if the image failed to load, return failure
	if (!dib)
		return false;

	//retrieve the image data
	bits = FreeImage_GetBits(dib);
	//get the image width and height
	width = FreeImage_GetWidth(dib);
	height = FreeImage_GetHeight(dib);
	//if this somehow one of these failed (they shouldn't), return failure
	if ((bits == 0) || (width == 0) || (height == 0))
		return false;
	//generate an OpenGL texture ID for this texture
	glGenTextures(1, &texID);
	//store the texture ID mapping
	//bind to the new texture ID
	
	glBindTexture(GL_TEXTURE_2D, texID);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);	// 线形滤波
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);   // 线形滤波
	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
																		//store the texture data for OpenGL use
	glTexImage2D(GL_TEXTURE_2D, level, internal_format, width, height,
		border, image_format, GL_UNSIGNED_BYTE, bits);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	//Free FreeImage's copy of the data
	FreeImage_Unload(dib);

	//return success
	return true;
}

BOOL fipImage::save(const char* lpszPathName, int flag) const {
	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
	BOOL bSuccess = FALSE;

	// Try to guess the file format from the file extension
	fif = FreeImage_GetFIFFromFilename(lpszPathName);
	if(fif != FIF_UNKNOWN ) {
		// Check that the dib can be saved in this format
		BOOL bCanSave;

		FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(_dib);
		if(image_type == FIT_BITMAP) {
			// standard bitmap type
			WORD bpp = FreeImage_GetBPP(_dib);
			bCanSave = (FreeImage_FIFSupportsWriting(fif) && FreeImage_FIFSupportsExportBPP(fif, bpp));
		} else {
			// special bitmap type
			bCanSave = FreeImage_FIFSupportsExportType(fif, image_type);
		}

		if(bCanSave) {
			bSuccess = FreeImage_Save(fif, _dib, lpszPathName, flag);
			return bSuccess;
		}
	}
	return bSuccess;
}

int _tmain(int argc, _TCHAR* argv[])
{
	const char* filename = "1.jpg";
	FREE_IMAGE_FORMAT fif = FreeImage_GetFileType(filename, 0);
	FIBITMAP *dib(0);
	//pointer to the image data
	BYTE* bits(0);
	//image width and height
	unsigned int width(0), height(0);

	if(fif == FIF_UNKNOWN) 
		fif = FreeImage_GetFIFFromFilename(filename);

	if(fif == FIF_UNKNOWN)
		return 1;

	if(FreeImage_FIFSupportsReading(fif))
		dib = FreeImage_Load(fif, filename);

	//retrieve the image data
	bits = FreeImage_GetBits(dib);
	//get the image width and height
	width = FreeImage_GetWidth(dib);
	height = FreeImage_GetHeight(dib);
	//if this somehow one of these failed (they shouldn't), return failure
	if((bits == 0) || (width == 0) || (height == 0))
		return 1;
	return 0;
}

bool RGBAImage::WriteToFile(const char* filename)
{
	const FREE_IMAGE_FORMAT fileType = FreeImage_GetFIFFromFilename(filename);
	if(FIF_UNKNOWN == fileType)
	{
		printf("Can't save to unknown filetype %s\n", filename);
		return false;
	}

	FIBITMAP* bitmap = FreeImage_Allocate(Width, Height, 32, 0x000000ff, 0x0000ff00, 0x00ff0000);
	if(!bitmap)
	{
		printf("Failed to create freeimage for %s\n", filename);
		return false;
	}

	const unsigned int* source = Data;
	for( int y=0; y < Height; y++, source += Width )
	{
		unsigned int* scanline = (unsigned int*)FreeImage_GetScanLine(bitmap, Height - y - 1 );
		memcpy(scanline, source, sizeof(source[0]) * Width);
	}

	FreeImage_SetTransparent(bitmap, true);
	FIBITMAP* converted = FreeImage_ConvertTo24Bits(bitmap);


	const bool result = !!FreeImage_Save(fileType, converted, filename);
	if(!result)
		printf("Failed to save to %s\n", filename);

	FreeImage_Unload(converted);
	FreeImage_Unload(bitmap);
	return result;
}

//----------------------------------------------------------------
void  ofImage::saveImageFromPixels(string fileName, ofPixels &pix){

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

	#ifdef TARGET_LITTLE_ENDIAN
		if (pix.bytesPerPixel != 1) swapRgb(pix);
	#endif

	FIBITMAP * bmp	= getBmpFromPixels(pix);

	#ifdef TARGET_LITTLE_ENDIAN
		if (pix.bytesPerPixel != 1) swapRgb(pix);
	#endif

	fileName = ofToDataPath(fileName);
	if (pix.bAllocated == true){
		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)) {
			FreeImage_Save(fif, bmp, fileName.c_str(), 0);
		}
	}

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

bool CTexture::loadTexture2D(std::string sTexturePath, bool bGenerateMipMaps)
{
	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
	FIBITMAP* dib(0);

	fif = FreeImage_GetFileType(sTexturePath.c_str(), 0); // 检查文件签名，推导其格式
	if(fif == FIF_UNKNOWN) fif = FreeImage_GetFIFFromFilename(sTexturePath.c_str()); 	// 从扩展名猜测格式
	if(fif == FIF_UNKNOWN) return false;

	//clock_t begin = clock();
	if(FreeImage_FIFSupportsReading(fif)) dib = FreeImage_Load(fif, sTexturePath.c_str());
	if(!dib) return false;
	//clock_t end = clock();
	//cout << end - begin << endl;
		
	GLubyte* bDataPointer = FreeImage_GetBits(dib);
	if(bDataPointer == NULL || FreeImage_GetWidth(dib) == 0 || FreeImage_GetHeight(dib) == 0)
		return false;

	GLenum format = FreeImage_GetBPP(dib) == 24 ? GL_BGR : FreeImage_GetBPP(dib) == 8 ? GL_LUMINANCE : 0;
	createFromData(bDataPointer, 
		FreeImage_GetWidth(dib), FreeImage_GetHeight(dib), FreeImage_GetBPP(dib), format, bGenerateMipMaps);

	FreeImage_Unload(dib);

	m_sTexturePath = sTexturePath;
	return true;
}

VALUE rb_graffik_open(VALUE self, VALUE rb_filename) {
  char *filename = STR2CSTR(rb_filename);
  FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
  
  // Try various methods to thet the image format
  fif = FreeImage_GetFileType(filename, 0);
  if (fif == FIF_UNKNOWN) {
    fif = FreeImage_GetFIFFromFilename(filename);
  }
  
  if ((fif != FIF_UNKNOWN) && FreeImage_FIFSupportsReading(fif)) {
    int flags = ((fif == FIF_JPEG) ? JPEG_ACCURATE : 0);
    // Load the image from disk
    FIBITMAP *image = FreeImage_Load(fif, filename, flags);
    // Develop an instance for Ruby
    VALUE instance = Data_Wrap_Struct(self, NULL, NULL, image);
    // Store the image type as a FixNum
    rb_iv_set(instance, "@file_type", INT2FIX(fif));
    
    // If a block is given, yield to it, if not, return the instance
    if (rb_block_given_p()) {
      return rb_ensure(rb_yield, instance, rb_graffik_close, instance);
    } else {
      return instance;
    }
  }
  
  // If we couldn't load it, throw and error
  rb_raise(rb_eTypeError, "Unknown file format");
}

bool CTexture::loadTexture2D(string a_sPath, bool bGenerateMipMaps)
{
	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
	FIBITMAP* dib(0);

	fif = FreeImage_GetFileType(a_sPath.c_str(), 0); // Check the file signature and deduce its format

	if(fif == FIF_UNKNOWN) // If still unknown, try to guess the file format from the file extension
		fif = FreeImage_GetFIFFromFilename(a_sPath.c_str());
	
	if(fif == FIF_UNKNOWN) // If still unknown, return failure
		return false;

	if(FreeImage_FIFSupportsReading(fif)) // Check if the plugin has reading capabilities and load the file
		dib = FreeImage_Load(fif, a_sPath.c_str());
	if(!dib)
		return false;

	BYTE* bDataPointer = FreeImage_GetBits(dib); // Retrieve the image data

	// If somehow one of these failed (they shouldn't), return failure
	if(bDataPointer == NULL || FreeImage_GetWidth(dib) == 0 || FreeImage_GetHeight(dib) == 0)
		return false;

	GLenum format = FreeImage_GetBPP(dib) == 24 ? GL_BGR : FreeImage_GetBPP(dib) == 8 ? GL_LUMINANCE : 0;
	createFromData(bDataPointer, FreeImage_GetWidth(dib), FreeImage_GetHeight(dib), FreeImage_GetBPP(dib), format, bGenerateMipMaps);
	
	FreeImage_Unload(dib);

	sPath = a_sPath;

	return true; // Success
}

bool TextureManager::LoadTexture(const char *filename, const unsigned int texID, bool generate, GLenum target,
                                 GLenum image_format, GLint internal_format, GLint level, GLint border) {
  // image format
  FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
  // pointer to the image, once loaded
  FIBITMAP *dib(0);
  // pointer to the image data
  BYTE *bits(0);
  // image width and height
  unsigned int width(0), height(0);
  // OpenGL's image ID to map to
  GLuint gl_texID;

  // check the file signature and deduce its format
  fif = FreeImage_GetFileType(filename, 0);
  // if still unknown, try to guess the file format from the file extension
  if (fif == FIF_UNKNOWN)
    fif = FreeImage_GetFIFFromFilename(filename);
  // if still unkown, return failure
  if (fif == FIF_UNKNOWN)
    return false;

  // check that the plugin has reading capabilities and load the file
  if (FreeImage_FIFSupportsReading(fif))
    dib = FreeImage_Load(fif, filename);
  // if the image failed to load, return failure
  if (!dib)
    return false;

  // retrieve the image data
  bits = FreeImage_GetBits(dib);
  // get the image width and height
  width = FreeImage_GetWidth(dib);
  height = FreeImage_GetHeight(dib);
  // if this somehow one of these failed (they shouldn't), return failure
  if ((bits == 0) || (width == 0) || (height == 0))
    return false;

  // if this texture ID is in use, unload the current texture
  if (m_texID.find(texID) != m_texID.end())
    glDeleteTextures(1, &(m_texID[texID]));

  if (generate) {
    // generate an OpenGL texture ID for this texture
    glGenTextures(1, &gl_texID);
    // store the texture ID mapping
    m_texID[texID] = gl_texID;
    // bind to the new texture ID
    glBindTexture(target, gl_texID);
  }

  // store the texture data for OpenGL use
  glTexImage2D(target, level, internal_format, width, height, border, image_format, GL_UNSIGNED_BYTE, bits);

  // Free FreeImage's copy of the data
  FreeImage_Unload(dib);

  // return success
  return true;
}

	Texture::Texture(const char* file) {
		FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
		FIBITMAP* dib = nullptr;
		fif = FreeImage_GetFileType(file, 0);
		if (fif == FIF_UNKNOWN)
			fif = FreeImage_GetFIFFromFilename(file);
		if (fif != FIF_UNKNOWN) {
			if (FreeImage_FIFSupportsReading(fif))
				dib = FreeImage_Load(fif, file);
			BYTE* pixels = FreeImage_GetBits(dib);
			int width = FreeImage_GetWidth(dib);
			int height = FreeImage_GetHeight(dib);
			int bits = FreeImage_GetBPP(dib);
			int size = width * height * (bits / 8);
			BYTE* result = new BYTE[size];
			memcpy(result, pixels, size);
			FreeImage_Unload(dib);

			glGenTextures(1, &m_ID);
			glBindTexture(GL_TEXTURE_2D, m_ID);
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, result ? result : NULL);
			glBindTexture(GL_TEXTURE_2D, 0);
		}
		else {
			m_ID = -1;
		}
	}

/** Generic image writer
@param dib Pointer to the dib to be saved
@param lpszPathName Pointer to the full file name
@param flag Optional save flag constant
@return Returns true if successful, returns false otherwise
*/
bool GenericWriter(const bitmap_ptr& dib, const std::string& lpszPathName, int flag) {
	auto fif = FIF_UNKNOWN;
	auto bSuccess = FALSE;
	// check if file path is not empty
	if (lpszPathName.empty())
		return false;
	if (dib) {
		// try to guess the file format from the file extension
		fif = FreeImage_GetFIFFromFilename(lpszPathName.c_str());
		if (fif != FIF_UNKNOWN) {
			// check that the plugin has sufficient writing and export capabilities ...
			if (FreeImage_FIFSupportsWriting(fif) && FreeImage_FIFSupportsExportType(fif, FreeImage_GetImageType(dib.get()))) {
				// ok, we can save the file
				bSuccess = FreeImage_Save(fif, dib.get(), lpszPathName.c_str(), flag);
				// unless an abnormal bug, we are done !
			}
			else {
				std::cout << "Can't save file" << lpszPathName << std::endl;
			}
		}
    else {
      std::cerr << "Can't determine output file type" << std::endl;
    }
	}
	return (bSuccess == TRUE);
}

BOOL fipImage::load(const char* lpszPathName, int flag) {
	FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;

	// check the file signature and get its format
	// (the second argument is currently not used by FreeImage)
	fif = FreeImage_GetFileType(lpszPathName, 0);
	if(fif == FIF_UNKNOWN) {
		// no signature ?
		// try to guess the file format from the file extension
		fif = FreeImage_GetFIFFromFilename(lpszPathName);
	}
	// check that the plugin has reading capabilities ...
	if((fif != FIF_UNKNOWN) && FreeImage_FIFSupportsReading(fif)) {
		// Free the previous dib
		if(_dib) {
			FreeImage_Unload(_dib);			
		}
		// Load the file
		_dib = FreeImage_Load(fif, lpszPathName, flag);
		_bHasChanged = TRUE;
		if(_dib == NULL)
			return FALSE;
		return TRUE;
	}
	return FALSE;
}

	FREEIMAGE_BMP*
	FREEIMAGE_LoadImage(const UString& filePath)
	{
		FREEIMAGE_BMP* vix_bmp = new FREEIMAGE_BMP;
		vix_bmp->path = filePath;
		vix_bmp->name = getFileName(filePath);
		vix_bmp->format = FREEIMAGE_FormatFromExtension(getFileExtension(filePath, false));
		vix_bmp->data = NULL;
		vix_bmp->bitmap = NULL;

		/*Here we must */
		
		//Check file signature and deduce format
#ifdef UNICODE
		vix_bmp->format = FreeImage_GetFileTypeU(filePath.c_str());
#else
		vix_bmp->format = FreeImage_GetFileType(filePath.c_str());
#endif
		if (vix_bmp->format == FIF_UNKNOWN) {
#ifdef UNICODE
			vix_bmp->format = FreeImage_GetFIFFromFilenameU(filePath.c_str());
#else
			vix_bmp->format = FreeImage_GetFIFFromFilename(filePath.c_str());
#endif
		}
			
		//if still unknown, return NULL;
		if (vix_bmp->format == FIF_UNKNOWN)
			return NULL;

		//Check if FreeImage has reading capabilities
		if (FreeImage_FIFSupportsReading(vix_bmp->format)) {
#ifdef UNICODE
			//read image into struct pointer
			vix_bmp->bitmap = FreeImage_LoadU(vix_bmp->format, filePath.c_str());
#else
			vix_bmp->bitmap = FreeImage_Load(vix_bmp->format, filePath.c_str());
#endif
			
		}

		//If image failed to load, return NULL
		if (!vix_bmp->bitmap)
			return NULL;

		FreeImage_FlipVertical(vix_bmp->bitmap);

		//Retrieve image data
		vix_bmp->data = FreeImage_GetBits(vix_bmp->bitmap);
		//Retrieve image width
		vix_bmp->header.width = FreeImage_GetWidth(vix_bmp->bitmap);
		//Retrieve image height
		vix_bmp->header.height = FreeImage_GetHeight(vix_bmp->bitmap);
		if (vix_bmp->data == 0 || vix_bmp->header.width == 0 || vix_bmp->header.height == 0)
			return NULL;

		//return bitmap
		return vix_bmp;
	}