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/* *****************************************************************************
** $Id$
** Initial file written and documented by:
** Kevin Shepherd <kshepherd@php.net> December 2007
** of Scarlet Line http://www.scarletline.com/
*******************************************************************************/
/** \file gdpp.cxx
\brief Implements the non-trivial methods of GD::Image.
Implementation of the more complex methods defined
in gdpp.h.
Notably includes the methods which determine the image file
format of a file before reading it into memory.
*/
#ifdef __cplusplus
#include "gdpp.h"
namespace GD
{
/**
Load an image from a file, after attempting to
determine it's image file format.
Invoke CreateFrom with an already opened
pointer to a file containing the desired image.
CreateFrom does not close the file.
\param[in] in An opened FILE * pointer.
\return true for success, or false if unable to load the image (most often because the
file is corrupt or does not contain a recognized image format).
You can call Width() and Height() member functions of the image to determine its size.
*/
bool Image::CreateFrom(FILE * in)
{
bool rtn;
int c = fgetc(in);
ungetc(c, in);
switch (c)
{
/* PNG
The first eight bytes of a PNG file always contain the following (decimal) values:
0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
== .PNG\r\n.\n
*/
#ifdef HAVE_LIBPNG
case 0x89: // PNG
rtn = CreateFromPng(in);
break;
#endif
/* GIF
0x47 0x49 0x46
*/
case 0x47: // GIF
rtn = CreateFromGif(in);
break;
#ifdef HAVE_LIBJPEG
/* JPEG
A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0,
followed by two variable bytes (often hex 00 10), followed by 'JFIF'.
*/
case 0xFF: // JPEG
rtn = CreateFromJpeg(in);
break;
#endif
/* WBMP
WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type
*/
case 0x00: // WBMP
rtn = CreateFromWBMP(in);
break;
/* GD2
0x67 0x64 0x32 0x00
== GD2\0
Starts with gd2
*/
case 0x67: // GD2
rtn = CreateFromGd2(in);
break;
/* GD
0xFF 0xFE
or
0xFF 0xFF
Conflicts with Jpeg
*/
/* XBM
#define test_width 16
#define test_height 7
*/
case 0x23: // XBM
rtn = CreateFromXbm(in);
break;
default:
rtn = false;
break;
}
return rtn;
}
/**
Load an image from a standard input stream, after attempting to
determine it's image file format.
Invoke CreateFrom with an already opened stream
containing the desired image.
CreateFrom does not close the stream.
\param[in] in An opened standard library input stream.
\return true for success, or false if unable to load the image (most often because the
file is corrupt or does not contain a recognized image format).
You can call Width() and Height() member functions of the image to determine its size.
Example usage, convert anything to gif:
#include <fstream>
#include <gdpp.h>
std::ifstream in("image.xxx", std::ios_base::in | std::ios_base::binary );
GD::Image im;
im.CreateFrom(in);
if (im.good())
{
std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
im.Gif(out);
}
*/
bool Image::CreateFrom(std::istream & in)
{
bool rtn;
switch (in.peek())
{
#ifdef HAVE_LIBPNG
/* PNG
The first eight bytes of a PNG file always contain the following (decimal) values:
0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
== .PNG\r\n.\n
*/
case 0x89: // PNG
rtn = CreateFromPng(in);
break;
#endif
/* GIF
0x47 0x49 0x46
*/
case 0x47: // GIF
rtn = CreateFromGif(in);
break;
#ifdef HAVE_LIBJPEG
/* JPEG
A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0,
followed by two variable bytes (often hex 00 10), followed by 'JFIF'.
*/
case 0xFF: // JPEG
rtn = CreateFromJpeg(in);
break;
#endif
/* WBMP
WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type
*/
case 0x00: // WBMP
rtn = CreateFromWBMP(in);
break;
/* GD2
0x67 0x64 0x32 0x00
== GD2\0
Starts with gd2
*/
case 0x67: // GD2
rtn = CreateFromGd2(in);
break;
/* GD
0xFF 0xFE
or
0xFF 0xFF
Conflicts with Jpeg
*/
default:
rtn = false;
break;
}
return rtn;
}
/**
Load an image from an in-RAM memory block, after attempting to
determine it's image format.
CreateFrom does not de-allocate the memory.
\param[in] size The byte count of the memory block.
\param[in] data A pointer to the memory block.
\return true for success, or false if unable to load the image (most often because the
formatting is corrupt or does not contain a recognized image format).
You can call Width() and Height() member functions of the image to determine its size.
*/
bool Image::CreateFrom(int size, void * data)
{
bool rtn;
switch (((unsigned char * )data)[0])
{
#ifdef HAVE_LIBPNG
/* PNG
The first eight bytes of a PNG file always contain the following (decimal) values:
0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
== .PNG\r\n.\n
*/
case 0x89: // PNG
rtn = CreateFromPng(size, data);
break;
#endif
/* GIF
0x47 0x49 0x46
*/
case 0x47: // GIF
rtn = CreateFromGif(size, data);
break;
#ifdef HAVE_LIBJPEG
/* JPEG
A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0,
followed by two variable bytes (often hex 00 10), followed by 'JFIF'.
*/
case 0xFF: // JPEG
rtn = CreateFromJpeg(size, data);
break;
#endif
/* WBMP
WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type
*/
case 0x00: // WBMP
rtn = CreateFromWBMP(size, data);
break;
/* GD2
0x67 0x64 0x32 0x00
== GD2\0
Starts with gd2
*/
case 0x67: // GD2
rtn = CreateFromGd2(size, data);
break;
/* GD
0xFF 0xFE
or
0xFF 0xFF
Conflicts with Jpeg
*/
default:
rtn = false;
break;
}
return rtn;
}
} // namespace GD
/**
Load an image from a standard input stream, regardless of it's image file format.
You can call Width() and Height() member functions of the image to determine its size.
Example usage, convert anything to gif:
#include <fstream>
#include <gdpp.h>
std::ifstream in("image.xxx", std::ios_base::in | std::ios_base::binary );
GD::Image im;
in >> im;
if (im.good())
{
std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
im.Gif(out);
}
*/
std::istream & operator>> (std::istream & in, GD::Image & img)
{
img.CreateFrom(in);
return in;
}
#endif /* __cplusplus */
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