127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
/* *****************************************************************************
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** $Id$
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** Initial file written and documented by:
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** Kevin Shepherd <kshepherd@php.net> December 2007
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** of Scarlet Line http://www.scarletline.com/
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*******************************************************************************/
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/** \file gd_io_stream.h
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\brief C++ standard library iostream specializations of gdIOCtx.
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Note that all of the methods defined in this header are internal to the
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libgd library, except for the constructors.
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Only the constructors are needed by a user of the libgd API.
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This file does not use or need gdpp.h, but if GD::Image is
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used, then C++ coding becomes even simpler, and the classes below
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become entirely hidden implementation details.
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Example usage, convert png to gif:
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#include <fstream>
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#include "gd_io_stream.h"
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std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
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if (in.good())
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{
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istreamIOCtx _in_ctx(in);
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gdImagePtr im_in = gdImageCreateFromPngCtx ( & _in_ctx);
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std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
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ostreamIOCtx _out_ctx(out);
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gdImageGifCtx(im_in, & _out_ctx);
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}
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gdImageDestroy(im_in);
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*/
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#ifdef __cplusplus
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#ifndef _gd_io_stream_h
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#define _gd_io_stream_h
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#include "gd.h"
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#include <iostream>
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/** Standard library input stream specialization of gdIOCtx
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*/
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class BGD_EXPORT_DATA_IMPL istreamIOCtx : public gdIOCtx
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{
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public:
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typedef std::istream stream_type;
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/** Construct an instance of this input stream specialization,
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given an input stream.
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For example:
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std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
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istreamIOCtx in_ctx(in);
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*/
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istreamIOCtx(stream_type & __stream) {
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init( & __stream);
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}
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static int Getbuf (struct gdIOCtx * ctx, void * buf, int size);
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static int Putbuf (struct gdIOCtx * , const void * , int );
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static void Putchar (struct gdIOCtx * , int );
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static int Getchar (struct gdIOCtx * ctx);
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static int Seek (struct gdIOCtx * ctx, const int pos);
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static long Tell (struct gdIOCtx * ctx);
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static void FreeCtx (struct gdIOCtx * ctx);
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void init(stream_type * __stream) {
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getC = Getchar;
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putC = Putchar;
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getBuf = Getbuf;
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putBuf = Putbuf;
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tell = Tell;
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seek = Seek;
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gd_free = FreeCtx;
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_M_stream = __stream;
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}
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private:
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stream_type * _M_stream;
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};
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/** Allocate a new instance of the class
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*/
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inline gdIOCtx * gdNewIstreamCtx (std::istream * __stream)
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{
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return new istreamIOCtx(* __stream);
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}
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/** Standard library output stream specialization of gdIOCtx
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*/
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class BGD_EXPORT_DATA_IMPL ostreamIOCtx : public gdIOCtx
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{
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public:
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typedef std::ostream stream_type;
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/** Construct an instance of this output stream specialization,
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given an output stream.
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For example:
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std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
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ostreamIOCtx out_ctx(out);
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*/
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ostreamIOCtx(stream_type & __stream) {
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init( & __stream);
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}
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static int Getbuf (struct gdIOCtx * , void * , int );
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static int Putbuf (struct gdIOCtx * ctx, const void * buf, int size);
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static int Getchar (struct gdIOCtx * );
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static void Putchar (struct gdIOCtx * ctx, int a);
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static int Seek (struct gdIOCtx * ctx, const int pos);
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static long Tell (struct gdIOCtx * ctx);
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static void FreeCtx (struct gdIOCtx * ctx);
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void init(stream_type * __stream) {
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getC = Getchar;
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putC = Putchar;
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getBuf = Getbuf;
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putBuf = Putbuf;
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tell = Tell;
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seek = Seek;
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gd_free = FreeCtx;
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_M_stream = __stream;
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}
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private:
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stream_type * _M_stream;
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};
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/** Allocate a new instance of the class
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*/
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inline gdIOCtx * gdNewOstreamCtx (std::ostream * __stream)
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{
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return new ostreamIOCtx(* __stream);
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}
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#endif /* _gd_io_stream_h */
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#endif /* __cplusplus */
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