C++ (Cpp) png_write_flush Examples

Example #1

File: shrinker.cpp Project: bsmr-games/Privateer-Gemini-Gold

errort	WritePNG( FILE * fp , unsigned char * data, unsigned int sizeX, unsigned int sizeY, int img_depth, int img_alpha)
{
  png_structp png_ptr = png_create_write_struct
    (PNG_LIBPNG_VER_STRING, (png_voidp)NULL,NULL,NULL);
  if (!png_ptr)
    return BadFormat;
  
  png_infop info_ptr = png_create_info_struct(png_ptr);
  if (!info_ptr) {
    png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
    return BadFormat;
  }
  if (setjmp(png_ptr->jmpbuf)) {
    png_destroy_write_struct(&png_ptr, &info_ptr);
    return BadFormat;
  }

  png_init_io(png_ptr, fp);

  png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
  png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);

  /* set other zlib parameters */
  png_set_compression_mem_level(png_ptr, 8);
  png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
  png_set_compression_window_bits(png_ptr, 15);
  png_set_compression_method(png_ptr, 8);
  
  png_set_IHDR(png_ptr, 
	       info_ptr, 
	       sizeX,
	       sizeY,
	       img_depth, 
	       img_alpha?PNG_COLOR_TYPE_RGB_ALPHA:PNG_COLOR_TYPE_RGB, 
	       PNG_INTERLACE_NONE,
	       PNG_COMPRESSION_TYPE_DEFAULT, 
	       PNG_FILTER_TYPE_DEFAULT);
  
  png_write_info(png_ptr, info_ptr);
# if __BYTE_ORDER != __BIG_ENDIAN  
  if (img_depth==16) {
    png_set_swap(png_ptr);
  }
#endif
  int stride = (img_depth/8)*(img_alpha?4:3);
  png_byte **row_pointers = new png_byte*[sizeY];
  for (unsigned int i=0;i<sizeY;i++) {
    row_pointers[i]= (png_byte *)&data[stride*i*sizeX];
  }
  png_write_image (png_ptr,row_pointers);
  png_write_end(png_ptr, info_ptr);
  png_write_flush(png_ptr);
  png_destroy_write_struct(&png_ptr, &info_ptr);

  //free (data);
  delete [] row_pointers;
  return Ok;
}

Example #2

File: bmp_to_png.cpp Project: vegastrike/Vega-Strike-Engine-Source

void png_write( const char *myfile, unsigned char *data, unsigned int width, unsigned int height, bool alpha, char bpp )
{
    FILE *fp = VSFileSystem::vs_open( myfile, "wb" );
    png_structp png_ptr = png_create_write_struct
                              ( PNG_LIBPNG_VER_STRING, (png_voidp) NULL, NULL, NULL );
    if (!png_ptr)
        return;
    png_infop info_ptr = png_create_info_struct( png_ptr );
    if (!info_ptr) {
        png_destroy_write_struct( &png_ptr, (png_infopp) NULL );
        return;
    }
    if ( setjmp( png_ptr->jmpbuf ) ) {
        png_destroy_write_struct( &png_ptr, &info_ptr );
        VSFileSystem::vs_close( fp );
        return;
    }
    png_init_io( png_ptr, fp );
    png_set_filter( png_ptr, 0, PNG_FILTER_NONE );
    png_set_compression_level( png_ptr, Z_BEST_COMPRESSION );

    /* set other zlib parameters */
    png_set_compression_mem_level( png_ptr, 8 );
    png_set_compression_strategy( png_ptr, Z_DEFAULT_STRATEGY );
    png_set_compression_window_bits( png_ptr, 15 );
    png_set_compression_method( png_ptr, 8 );

    png_set_IHDR( png_ptr,
                  info_ptr,
                  width,
                  height,
                  bpp,
                  alpha ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB,
                  PNG_INTERLACE_NONE,
                  PNG_COMPRESSION_TYPE_DEFAULT,
                  PNG_FILTER_TYPE_DEFAULT );

    png_write_info( png_ptr, info_ptr );
# if __BYTE_ORDER != __BIG_ENDIAN
    if (bpp == 16)
        png_set_swap( png_ptr );
#endif
    int stride = (bpp/8)*(alpha ? 4 : 3);
    png_byte **row_pointers = new png_byte*[height];
    for (unsigned int i = 0; i < height; i++)
        row_pointers[i] = (png_byte*) &data[stride*i*width];
    png_write_image( png_ptr, row_pointers );
    png_write_end( png_ptr, info_ptr );
    png_write_flush( png_ptr );
    png_destroy_write_struct( &png_ptr, &info_ptr );

    VSFileSystem::vs_close( fp );
    free( data );
    delete[] row_pointers;
}