31 #ifndef PNGPP_WRITER_HPP_INCLUDED    32 #define PNGPP_WRITER_HPP_INCLUDED    65     template< 
class ostream >
    75             : 
io_base(png_create_write_struct(PNG_LIBPNG_VER_STRING,
    80             png_set_write_fn(
m_png, & stream, write_data, flush_data);
    91             if (setjmp(png_jmpbuf(
m_png)))
   106             if (setjmp(png_jmpbuf(
m_png)))
   118             if (setjmp(png_jmpbuf(
m_png)))
   122             png_write_row(
m_png, bytes);
   130             if (setjmp(png_jmpbuf(
m_png)))
   138         static void write_data(png_struct* 
png, 
byte* data, png_size_t length)
   143             ostream* stream = 
reinterpret_cast< ostream* 
>(png_get_io_ptr(png));
   146                 stream->write(reinterpret_cast< char* >(data), length);
   149                     wr->
set_error(
"ostream::write() failed");
   152             catch (std::exception 
const& 
error)
   158                 assert(!
"caught something wrong");
   159                 wr->
set_error(
"write_data: caught something wrong");
   167         static void flush_data(png_struct* png)
   172             ostream* stream = 
reinterpret_cast< ostream* 
>(png_get_io_ptr(png));
   178                     wr->
set_error(
"ostream::flush() failed");
   181             catch (std::exception 
const& 
error)
   187                 assert(!
"caught something wrong");
   188                 wr->
set_error(
"flush_data: caught something wrong");
   199 #endif // PNGPP_WRITER_HPP_INCLUDED end_info m_end_info
Definition: io_base.hpp:461
void write() const 
Definition: info.hpp:116
writer(ostream &stream)
Constructs a writer prepared to write PNG image into a stream. 
Definition: writer.hpp:74
Base class for PNG reader/writer classes. 
Definition: io_base.hpp:62
~writer()
Definition: writer.hpp:83
void write_png() const 
Definition: writer.hpp:89
bool is_error() const 
Definition: io_base.hpp:442
void write_info() const 
Write info about PNG image. 
Definition: writer.hpp:104
info m_info
Definition: io_base.hpp:460
void write() const 
Definition: end_info.hpp:64
std::string m_error
Definition: io_base.hpp:462
void raise_error()
Definition: io_base.hpp:447
png_struct * m_png
Definition: io_base.hpp:459
png_info * get_png_info() const 
Definition: info_base.hpp:59
png_info ** get_png_info_ptr()
Definition: info_base.hpp:64
png_byte byte
Definition: types.hpp:39
void write_end_info() const 
Reads ending info about PNG image. 
Definition: writer.hpp:128
void reset_error()
Definition: io_base.hpp:430
PNG writer class template. This is the low-level writing interface–use image class or generator cla...
Definition: writer.hpp:66
void destroy()
Definition: end_info.hpp:53
Exception class to represent runtime errors related to png++ operation. 
Definition: error.hpp:57
void set_error(char const *message)
Definition: io_base.hpp:424
void write_row(byte *bytes)
Writes a row of image data at a time. 
Definition: writer.hpp:116