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src/Source/FreeImage/PluginWebP.cpp  view on Meta::CPAN

// ==========================================================
// Google WebP Loader & Writer
//
// Design and implementation by
// - Herve Drolon (drolon@infonie.fr)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

#include "FreeImage.h"
#include "Utilities.h"

#include "../Metadata/FreeImageTag.h"

#include "../LibWebP/src/webp/decode.h"
#include "../LibWebP/src/webp/encode.h"
#include "../LibWebP/src/enc/vp8enci.h"
#include "../LibWebP/src/webp/mux.h"

// ==========================================================
// Plugin Interface
// ==========================================================

static int s_format_id;

// ----------------------------------------------------------
//   Helpers for the load function
// ----------------------------------------------------------

/**
Read the whole file into memory
*/
static BOOL
ReadFileToWebPData(FreeImageIO *io, fi_handle handle, WebPData * const bitstream) {
  uint8_t *raw_data = NULL;

  try {
	  // Read the input file and put it in memory
	  long start_pos = io->tell_proc(handle);
	  io->seek_proc(handle, 0, SEEK_END);
	  size_t file_length = (size_t)(io->tell_proc(handle) - start_pos);
	  io->seek_proc(handle, start_pos, SEEK_SET);
	  raw_data = (uint8_t*)malloc(file_length * sizeof(uint8_t));
	  if(!raw_data) {
		  throw FI_MSG_ERROR_MEMORY;
	  }
	  if(io->read_proc(raw_data, 1, (unsigned)file_length, handle) != file_length) {
		  throw "Error while reading input stream";
	  }
	  
	  // copy pointers (must be released later using free)
	  bitstream->bytes = raw_data;
	  bitstream->size = file_length;

	  return TRUE;

  } catch(const char *text) {
	  if(raw_data) {
		  free(raw_data);
	  }
	  memset(bitstream, 0, sizeof(WebPData));
	  if(NULL != text) {
		  FreeImage_OutputMessageProc(s_format_id, text);
	  }
	  return FALSE;
  }
}

// ----------------------------------------------------------
//   Helpers for the save function
// ----------------------------------------------------------

/**
Output function. Should return 1 if writing was successful.
data/data_size is the segment of data to write, and 'picture' is for
reference (and so one can make use of picture->custom_ptr).
*/
static int 
WebP_MemoryWriter(const BYTE *data, size_t data_size, const WebPPicture* const picture) {
	FIMEMORY *hmem = (FIMEMORY*)picture->custom_ptr;
	return data_size ? (FreeImage_WriteMemory(data, 1, (unsigned)data_size, hmem) == data_size) : 0;
}

// ==========================================================
// Plugin Implementation
// ==========================================================

static const char * DLL_CALLCONV
Format() {
	return "WebP";
}

static const char * DLL_CALLCONV
Description() {
	return "Google WebP image format";
}

static const char * DLL_CALLCONV
Extension() {
	return "webp";
}

static const char * DLL_CALLCONV
RegExpr() {
	return NULL;
}

static const char * DLL_CALLCONV
MimeType() {
	return "image/webp";
}

static BOOL DLL_CALLCONV