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