Merging r5975 through r6036 from trunk to ogl-es branch.

GLES drivers adapted, but only did make compile-tests.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CImageLoaderJPG.h

@@ -0,0 +1,116 @@
+// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#ifndef __C_IMAGE_LOADER_JPG_H_INCLUDED__
+#define __C_IMAGE_LOADER_JPG_H_INCLUDED__
+
+#include "IrrCompileConfig.h"
+
+#ifdef _IRR_COMPILE_WITH_JPG_LOADER_
+
+#include "IImageLoader.h"
+
+#include <stdio.h> // required for jpeglib.h
+#ifdef _IRR_COMPILE_WITH_LIBJPEG_
+extern "C" {
+	#ifndef _IRR_USE_NON_SYSTEM_JPEG_LIB_
+	#include <jpeglib.h> // use system lib
+	#else
+	#include "jpeglib/jpeglib.h" // use irrlicht jpeglib
+	#endif
+	#include <setjmp.h>
+}
+#endif // _IRR_COMPILE_WITH_LIBJPEG_
+
+
+namespace irr
+{
+namespace video
+{
+
+
+//! Surface Loader for JPG images
+class CImageLoaderJPG : public IImageLoader
+{
+public:
+
+	//! constructor
+	CImageLoaderJPG();
+
+	//! destructor
+	virtual ~CImageLoaderJPG();
+
+	//! returns true if the file maybe is able to be loaded by this class
+	//! based on the file extension (e.g. ".tga")
+	virtual bool isALoadableFileExtension(const io::path& filename) const _IRR_OVERRIDE_;
+
+	//! returns true if the file maybe is able to be loaded by this class
+	virtual bool isALoadableFileFormat(io::IReadFile* file) const _IRR_OVERRIDE_;
+
+	//! creates a surface from the file
+	virtual IImage* loadImage(io::IReadFile* file) const _IRR_OVERRIDE_;
+
+private:
+
+#ifdef _IRR_COMPILE_WITH_LIBJPEG_
+	// several methods used via function pointers by jpeglib
+
+	/* Receives control for a fatal error. Information sufficient to
+	generate the error message has been stored in cinfo->err; call
+	output_message to display it. Control must NOT return to the caller;
+	generally this routine will exit() or longjmp() somewhere.
+	Typically you would override this routine to get rid of the exit()
+	default behavior. Note that if you continue processing, you should
+	clean up the JPEG object with jpeg_abort() or jpeg_destroy().
+	*/
+	static void error_exit (j_common_ptr cinfo);
+
+	/* output error messages via Irrlicht logger. */
+	static void output_message(j_common_ptr cinfo);
+
+	/* Initialize source. This is called by jpeg_read_header() before any
+	data is actually read. Unlike init_destination(), it may leave
+	bytes_in_buffer set to 0 (in which case a fill_input_buffer() call
+	will occur immediately). */
+	static void init_source (j_decompress_ptr cinfo);
+
+	/* This is called whenever bytes_in_buffer has reached zero and more
+	data is wanted. In typical applications, it should read fresh data
+	into the buffer (ignoring the current state of next_input_byte and
+	bytes_in_buffer), reset the pointer & count to the start of the
+	buffer, and return TRUE indicating that the buffer has been reloaded.
+	It is not necessary to fill the buffer entirely, only to obtain at
+	least one more byte. bytes_in_buffer MUST be set to a positive value
+	if TRUE is returned. A FALSE return should only be used when I/O
+	suspension is desired (this mode is discussed in the next section). */
+	static boolean fill_input_buffer (j_decompress_ptr cinfo);
+
+	/* Skip num_bytes worth of data. The buffer pointer and count should
+	be advanced over num_bytes input bytes, refilling the buffer as
+	needed. This is used to skip over a potentially large amount of
+	uninteresting data (such as an APPn marker). In some applications
+	it may be possible to optimize away the reading of the skipped data,
+	but it's not clear that being smart is worth much trouble; large
+	skips are uncommon. bytes_in_buffer may be zero on return.
+	A zero or negative skip count should be treated as a no-op. */
+	static void skip_input_data (j_decompress_ptr cinfo, long num_bytes);
+
+	/* Terminate source --- called by jpeg_finish_decompress() after all
+	data has been read. Often a no-op. */
+	static void term_source (j_decompress_ptr cinfo);
+
+	// Copy filename to have it around for error-messages
+	static io::path Filename;
+
+	#endif // _IRR_COMPILE_WITH_LIBJPEG_
+};
+
+
+} // end namespace video
+} // end namespace irr
+
+
+#endif
+#endif
+