synfig-core/tags/0.61.08/src/modules/mod_png/mptr_png.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file mptr_png.cpp
   3 **      \brief ppm Target Module
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 **
  22 ** === N O T E S ===========================================================
  23 **
  24 ** ========================================================================= */
  25
  26 /*!
  27 **  \todo Support 16 bit PNG files
  28 **      \todo Support GAMMA correction
  29 **      \todo Fix memory leaks
  30 */
  31
  32 /* === H E A D E R S ======================================================= */
  33
  34 #ifdef USING_PCH
  35 #       include "pch.h"
  36 #else
  37 #ifdef HAVE_CONFIG_H
  38 #       include <config.h>
  39 #endif
  40
  41 #include "mptr_png.h"
  42 #include <synfig/importer.h>
  43 #include <synfig/time.h>
  44 #include <synfig/general.h>
  45
  46
  47 #include <cstdio>
  48 #include <algorithm>
  49 #include <functional>
  50 #endif
  51
  52 /* === M A C R O S ========================================================= */
  53
  54 using namespace synfig;
  55 using namespace std;
  56 using namespace etl;
  57
  58 #define PNG_CHECK_BYTES         8
  59
  60 /* === G L O B A L S ======================================================= */
  61
  62 SYNFIG_IMPORTER_INIT(png_mptr);
  63 SYNFIG_IMPORTER_SET_NAME(png_mptr,"png");
  64 SYNFIG_IMPORTER_SET_EXT(png_mptr,"png");
  65 SYNFIG_IMPORTER_SET_VERSION(png_mptr,"0.1");
  66 SYNFIG_IMPORTER_SET_CVS_ID(png_mptr,"$Id$");
  67
  68 /* === M E T H O D S ======================================================= */
  69
  70 void
  71 png_mptr::png_out_error(png_struct */*png_data*/,const char *msg)
  72 {
  73         //png_mptr *me=(png_mptr*)png_data->error_ptr;
  74         synfig::error(strprintf("png_mptr: error: %s",msg));
  75         //me->ready=false;
  76 }
  77
  78 void
  79 png_mptr::png_out_warning(png_struct */*png_data*/,const char *msg)
  80 {
  81         //png_mptr *me=(png_mptr*)png_data->error_ptr;
  82         synfig::warning(strprintf("png_mptr: warning: %s",msg));
  83         //me->ready=false;
  84 }
  85
  86 int
  87 png_mptr::read_chunk_callback(png_struct */*png_data*/, png_unknown_chunkp /*chunk*/)
  88 {
  89         /* The unknown chunk structure contains your
  90           chunk data: */
  91         //png_byte name[5];
  92         //png_byte *data;
  93         //png_size_t size;
  94         /* Note that libpng has already taken care of
  95           the CRC handling */
  96
  97         /* put your code here.  Return one of the
  98           following: */
  99
 100         //return (-n); /* chunk had an error */
 101         return (0); /* did not recognize */
 102         //return (n); /* success */
 103 }
 104
 105 png_mptr::png_mptr(const char *file_name)
 106 {
 107         filename=file_name;
 108
 109         /* Open the file pointer */
 110     FILE *file = fopen(file_name, "rb");
 111     if (!file)
 112     {
 113         //! \todo THROW SOMETHING
 114                 throw strprintf("Unable to physically open %s",file_name);
 115                 return;
 116     }
 117
 118
 119         /* Make sure we are dealing with a PNG format file */
 120         png_byte header[PNG_CHECK_BYTES];
 121         fread(header, 1, PNG_CHECK_BYTES, file);
 122     bool is_png = !png_sig_cmp(header, 0, PNG_CHECK_BYTES);
 123     if (!is_png)
 124     {
 125         //! \todo THROW SOMETHING
 126                 throw strprintf("This (\"%s\") doesn't appear to be a PNG file",file_name);
 127                 return;
 128     }
 129
 130
 131         png_structp png_ptr = png_create_read_struct
 132        (PNG_LIBPNG_VER_STRING, (png_voidp)this,
 133         &png_mptr::png_out_error, &png_mptr::png_out_warning);
 134         if (!png_ptr)
 135     {
 136         //! \todo THROW SOMETHING
 137                 throw String("error on importer construction, *WRITEME*3");
 138                 return;
 139     }
 140
 141     png_infop info_ptr = png_create_info_struct(png_ptr);
 142     if (!info_ptr)
 143     {
 144         png_destroy_read_struct(&png_ptr,
 145            (png_infopp)NULL, (png_infopp)NULL);
 146         //! \todo THROW SOMETHING
 147                 throw String("error on importer construction, *WRITEME*4");
 148                 return;
 149     }
 150
 151     png_infop end_info = png_create_info_struct(png_ptr);
 152     if (!end_info)
 153     {
 154         png_destroy_read_struct(&png_ptr, &info_ptr,
 155           (png_infopp)NULL);
 156         //! \todo THROW SOMETHING
 157                 throw String("error on importer construction, *WRITEME*4");
 158                 return;
 159     }
 160
 161
 162
 163         png_init_io(png_ptr, file);
 164         png_set_sig_bytes(png_ptr,PNG_CHECK_BYTES);
 165
 166         png_read_info(png_ptr, info_ptr);
 167
 168         int bit_depth,color_type,interlace_type, compression_type,filter_method;
 169         png_uint_32 width,height;
 170
 171         png_get_IHDR(png_ptr, info_ptr, &width, &height,
 172                                  &bit_depth, &color_type, &interlace_type,
 173                                  &compression_type, &filter_method);
 174
 175         if (bit_depth == 16)
 176                 png_set_strip_16(png_ptr);
 177
 178         if (bit_depth < 8)
 179                 png_set_packing(png_ptr);
 180
 181         double fgamma;
 182         if (png_get_gAMA(png_ptr, info_ptr, &fgamma))
 183         {
 184                 synfig::info("PNG: Image gamma is %f",fgamma);
 185                 png_set_gamma(png_ptr, gamma().get_gamma(), fgamma);
 186         }
 187
 188
 189         /*
 190         if (setjmp(png_jmpbuf(png_ptr)))
 191         {
 192                 synfig::error("Unable to setup longjump");
 193                 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 194                 fclose(file);
 195         //! \todo THROW SOMETHING
 196                 throw String("error on importer construction, *WRITEME*5");
 197                 return;
 198         }
 199         */
 200
 201         png_set_read_user_chunk_fn(png_ptr, this, &png_mptr::read_chunk_callback);
 202
 203         // man libpng tells me:
 204         //   You must use png_transforms and not call any
 205         //   png_set_transform() functions when you use png_read_png().
 206         // but we used png_set_gamma(), which may be why we were seeing a crash at the end
 207         //   png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING|PNG_TRANSFORM_STRIP_16, NULL);
 208
 209         png_read_update_info(png_ptr, info_ptr);
 210         png_uint_32 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
 211
 212         // allocate buffer to read image data into
 213         png_bytep *row_pointers=new png_bytep[height];
 214         png_byte *data = new png_byte[rowbytes*height];
 215         for (png_uint_32 i = 0; i < height; i++)
 216                 row_pointers[i] = &(data[rowbytes*i]);
 217
 218         png_read_image(png_ptr, row_pointers);
 219
 220         int x;
 221         int y;
 222         surface_buffer.set_wh(width,height);
 223
 224         switch(color_type)
 225         {
 226         case PNG_COLOR_TYPE_RGB:
 227                 for(y=0;y<surface_buffer.get_h();y++)
 228                         for(x=0;x<surface_buffer.get_w();x++)
 229                         {
 230                                 float r=gamma().r_U8_to_F32((unsigned char)row_pointers[y][x*3+0]);
 231                                 float g=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*3+1]);
 232                                 float b=gamma().b_U8_to_F32((unsigned char)row_pointers[y][x*3+2]);
 233                                 surface_buffer[y][x]=Color(
 234                                         r,
 235                                         g,
 236                                         b,
 237                                         1.0
 238                                 );
 239 /*
 240                                 surface_buffer[y][x]=Color(
 241                                         (float)(unsigned char)row_pointers[y][x*3+0]*(1.0/255.0),
 242                                         (float)(unsigned char)row_pointers[y][x*3+1]*(1.0/255.0),
 243                                         (float)(unsigned char)row_pointers[y][x*3+2]*(1.0/255.0),
 244                                         1.0
 245                                 );
 246 */
 247                         }
 248                 break;
 249
 250         case PNG_COLOR_TYPE_RGB_ALPHA:
 251                 for(y=0;y<surface_buffer.get_h();y++)
 252                         for(x=0;x<surface_buffer.get_w();x++)
 253                         {
 254                                 float r=gamma().r_U8_to_F32((unsigned char)row_pointers[y][x*4+0]);
 255                                 float g=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*4+1]);
 256                                 float b=gamma().b_U8_to_F32((unsigned char)row_pointers[y][x*4+2]);
 257                                 surface_buffer[y][x]=Color(
 258                                         r,
 259                                         g,
 260                                         b,
 261                                         (float)(unsigned char)row_pointers[y][x*4+3]*(1.0/255.0)
 262                                 );
 263                                 /*
 264                                 surface_buffer[y][x]=Color(
 265                                         (float)(unsigned char)row_pointers[y][x*4+0]*(1.0/255.0),
 266                                         (float)(unsigned char)row_pointers[y][x*4+1]*(1.0/255.0),
 267                                         (float)(unsigned char)row_pointers[y][x*4+2]*(1.0/255.0),
 268                                         (float)(unsigned char)row_pointers[y][x*4+3]*(1.0/255.0)
 269                                 );
 270                                 */
 271                         }
 272                 break;
 273
 274         case PNG_COLOR_TYPE_GRAY:
 275                 for(y=0;y<surface_buffer.get_h();y++)
 276                         for(x=0;x<surface_buffer.get_w();x++)
 277                         {
 278                                 float gray=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x]);
 279                                 //float gray=(float)(unsigned char)row_pointers[y][x]*(1.0/255.0);
 280                                 surface_buffer[y][x]=Color(
 281                                         gray,
 282                                         gray,
 283                                         gray,
 284                                         1.0
 285                                 );
 286                         }
 287                 break;
 288
 289         case PNG_COLOR_TYPE_GRAY_ALPHA:
 290                 for(y=0;y<surface_buffer.get_h();y++)
 291                         for(x=0;x<surface_buffer.get_w();x++)
 292                         {
 293                                 float gray=gamma().g_U8_to_F32((unsigned char)row_pointers[y][x*2]);
 294 //                              float gray=(float)(unsigned char)row_pointers[y][x*2]*(1.0/255.0);
 295                                 surface_buffer[y][x]=Color(
 296                                         gray,
 297                                         gray,
 298                                         gray,
 299                                         (float)(unsigned char)row_pointers[y][x*2+1]*(1.0/255.0)
 300                                 );
 301                         }
 302                 break;
 303
 304         case PNG_COLOR_TYPE_PALETTE:
 305                 synfig::warning("png_mptr: Paletted PNGs aren't yet fully supported.");
 306                 for(y=0;y<surface_buffer.get_h();y++)
 307                         for(x=0;x<surface_buffer.get_w();x++)
 308                         {
 309                                 float r=gamma().r_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].red);
 310                                 float g=gamma().g_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].green);
 311                                 float b=gamma().b_U8_to_F32((unsigned char)png_ptr->palette[row_pointers[y][x]].blue);
 312                                 surface_buffer[y][x]=Color(
 313                                         r,
 314                                         g,
 315                                         b,
 316                                         1.0
 317                                 );
 318                         }
 319                 break;
 320         default:
 321                 synfig::error("png_mptr: error: Unsupported color type");
 322         //! \todo THROW SOMETHING
 323                 throw String("error on importer construction, *WRITEME*6");
 324                 return;
 325         }
 326
 327         png_read_end(png_ptr, end_info);
 328         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 329         fclose(file);
 330
 331         delete [] row_pointers;
 332         delete [] data;
 333 }
 334
 335 png_mptr::~png_mptr()
 336 {
 337 }
 338
 339 bool
 340 png_mptr::get_frame(synfig::Surface &surface,Time, synfig::ProgressCallback */*cb*/)
 341 {
 342         surface.mirror(surface_buffer);
 343 //      surface=surface_buffer;
 344         return true;
 345 }