git.sesse.net Git - mlt/blob - src/modules/qimage/qimage_wrapper.cpp

   1 /*
   2  * qimage_wrapper.cpp -- a QT/QImage based producer for MLT
   3  * Copyright (C) 2006 Visual Media
   4  * Author: Charles Yates <charles.yates@gmail.com>
   5  *
   6  * NB: This module is designed to be functionally equivalent to the
   7  * gtk2 image loading module so it can be used as replacement.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include "qimage_wrapper.h"
  25
  26 #ifdef USE_QT3
  27 #include <qimage.h>
  28 #include <qmutex.h>
  29
  30 #ifdef USE_KDE
  31 #include <kinstance.h>
  32 #include <kimageio.h>
  33 #endif
  34
  35 #endif
  36
  37
  38 #ifdef USE_QT4
  39 #include <QtGui/QImage>
  40 #include <QtCore/QSysInfo>
  41 #include <QtCore/QMutex>
  42 #include <QtCore/QtEndian>
  43 #include <QtCore/QTemporaryFile>
  44 #endif
  45
  46 #ifdef USE_EXIF
  47 #include <libexif/exif-data.h>
  48 #endif
  49
  50 #include <cmath>
  51
  52 extern "C" {
  53
  54 #include <framework/mlt_pool.h>
  55 #include <framework/mlt_cache.h>
  56
  57 #ifdef USE_KDE
  58 static KInstance *instance = 0L;
  59 #endif
  60
  61 static void qimage_delete( void *data )
  62 {
  63         QImage *image = ( QImage * )data;
  64         delete image;
  65         image = NULL;
  66 #ifdef USE_KDE
  67         if (instance) delete instance;
  68         instance = 0L;
  69 #endif
  70 }
  71
  72 static QMutex g_mutex;
  73
  74 #ifdef USE_KDE
  75 void init_qimage()
  76 {
  77         if (!instance) {
  78             instance = new KInstance("qimage_prod");
  79             KImageIO::registerFormats();
  80         }
  81 }
  82 #endif
  83
  84 void refresh_qimage( producer_qimage self, mlt_frame frame, int width, int height )
  85 {
  86         // Obtain properties of frame
  87         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  88
  89         // Obtain the producer
  90         mlt_producer producer = &self->parent;
  91
  92         // Obtain properties of producer
  93         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
  94
  95         // restore QImage
  96         pthread_mutex_lock( &self->mutex );
  97         mlt_cache_item qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
  98         QImage *qimage = static_cast<QImage*>( mlt_cache_item_data( qimage_cache, NULL ) );
  99
 100         // restore scaled image
 101         self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
 102         self->current_image = static_cast<uint8_t*>( mlt_cache_item_data( self->image_cache, NULL ) );
 103
 104         // Check if user wants us to reload the image
 105         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
 106         {
 107                 qimage = NULL;
 108                 self->current_image = NULL;
 109                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 110         }
 111
 112         // Obtain the cache flag and structure
 113         int use_cache = mlt_properties_get_int( producer_props, "cache" );
 114         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
 115         int update_cache = 0;
 116
 117         // Get the time to live for each frame
 118         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 119
 120         // Get the original position of this frame
 121         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 122         position += mlt_producer_get_in( producer );
 123
 124         // Image index
 125         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 126
 127         // Key for the cache
 128         char image_key[ 10 ];
 129         sprintf( image_key, "%d", image_idx );
 130
 131         g_mutex.lock();
 132
 133         // Check if the frame is already loaded
 134         if ( use_cache )
 135         {
 136                 if ( cache == NULL )
 137                 {
 138                         cache = mlt_properties_new( );
 139                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 140                 }
 141
 142                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 143
 144                 if ( cached )
 145                 {
 146                         self->image_idx = image_idx;
 147                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 148                         self->current_width = mlt_properties_get_int( cached_props, "width" );
 149                         self->current_height = mlt_properties_get_int( cached_props, "height" );
 150                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 151                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 152                         self->current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 153                         self->has_alpha = mlt_properties_get_int( cached_props, "alpha" );
 154
 155                         if ( width != 0 && ( width != self->current_width || height != self->current_height ) )
 156                                 self->current_image = NULL;
 157                 }
 158         }
 159
 160         int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
 161
 162         // optimization for subsequent iterations on single pictur
 163         if ( width != 0 && ( image_idx != self->image_idx || width != self->current_width || height != self->current_height ) )
 164                 self->current_image = NULL;
 165         if ( image_idx != self->qimage_idx )
 166                 qimage = NULL;
 167
 168         if ( !qimage || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif)
 169         {
 170                 self->current_image = NULL;
 171                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 172
 173                 if ( !qimage->isNull( ) )
 174                 {
 175 #ifdef USE_EXIF
 176                         // Read the exif value for this file
 177                         if ( disable_exif == 0) {
 178                                 ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
 179                                 ExifEntry *entry;
 180                                 int exif_orientation = 0;
 181                                 /* get orientation and rotate image accordingly if necessary */
 182                                 if (d) {
 183                                         if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
 184                                                 exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
 185
 186                                         /* Free the EXIF data */
 187                                         exif_data_unref(d);
 188                                 }
 189
 190                                 if ( exif_orientation > 1 )
 191                                 {
 192                                       // Rotate image according to exif data
 193                                       QImage processed;
 194                                       QMatrix matrix;
 195
 196                                       switch ( exif_orientation ) {
 197                                           case 2:
 198                                               matrix.scale( -1, 1 );
 199                                               break;
 200                                           case 3:
 201                                               matrix.rotate( 180 );
 202                                               break;
 203                                           case 4:
 204                                               matrix.scale( 1, -1 );
 205                                               break;
 206                                           case 5:
 207                                               matrix.rotate( 270 );
 208                                               matrix.scale( -1, 1 );
 209                                               break;
 210                                           case 6:
 211                                               matrix.rotate( 90 );
 212                                               break;
 213                                           case 7:
 214                                               matrix.rotate( 90 );
 215                                               matrix.scale( -1, 1 );
 216                                               break;
 217                                           case 8:
 218                                               matrix.rotate( 270 );
 219                                               break;
 220                                       }
 221                                       processed = qimage->transformed( matrix );
 222                                       delete qimage;
 223                                       qimage = new QImage( processed );
 224                                 }
 225                         }
 226 #endif
 227                         // Store the width/height of the qimage
 228                         self->current_width = qimage->width( );
 229                         self->current_height = qimage->height( );
 230
 231                         // Register qimage for destruction and reuse
 232                         mlt_cache_item_close( qimage_cache );
 233                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage", qimage, 0, ( mlt_destructor )qimage_delete );
 234                         qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
 235                         self->qimage_idx = image_idx;
 236
 237                         mlt_events_block( producer_props, NULL );
 238                         mlt_properties_set_int( producer_props, "_real_width", self->current_width );
 239                         mlt_properties_set_int( producer_props, "_real_height", self->current_height );
 240                         mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
 241                         mlt_events_unblock( producer_props, NULL );
 242                 }
 243                 else
 244                 {
 245                         delete qimage;
 246                         qimage = NULL;
 247                 }
 248         }
 249
 250         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 251         if ( qimage && width > 0 && !self->current_image )
 252         {
 253                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 254                 int interp = 0;
 255
 256                 // QImage has two scaling modes - we'll toggle between them here
 257                 if ( strcmp( interps, "tiles" ) == 0 )
 258                         interp = 1;
 259                 else if ( strcmp( interps, "hyper" ) == 0 )
 260                         interp = 1;
 261
 262 #ifdef USE_QT4
 263                 // Note - the original qimage is already safe and ready for destruction
 264                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height ) ) :
 265                         qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
 266                 QImage temp;
 267                 self->has_alpha = scaled.hasAlphaChannel();
 268 #endif
 269
 270 #ifdef USE_QT3
 271                 // Note - the original qimage is already safe and ready for destruction
 272                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) :
 273                         qimage->smoothScale( width, height, QImage::ScaleFree );
 274                 self->has_alpha = 1;
 275 #endif
 276
 277                 // Store width and height
 278                 self->current_width = width;
 279                 self->current_height = height;
 280
 281                 // Allocate/define image
 282                 int dst_stride = width * ( self->has_alpha ? 4 : 3 );
 283                 int image_size = dst_stride * ( height + 1 );
 284                 self->current_image = ( uint8_t * )mlt_pool_alloc( image_size );
 285
 286                 // Copy the image
 287                 int y = self->current_height + 1;
 288                 uint8_t *dst = self->current_image;
 289                 while ( --y )
 290                 {
 291                         QRgb *src = (QRgb*) scaled.scanLine( self->current_height - y );
 292                         int x = self->current_width + 1;
 293                         while ( --x )
 294                         {
 295                                 *dst++ = qRed(*src);
 296                                 *dst++ = qGreen(*src);
 297                                 *dst++ = qBlue(*src);
 298                                 if ( self->has_alpha ) *dst++ = qAlpha(*src);
 299                                 ++src;
 300                         }
 301                 }
 302
 303                 // Update the cache
 304                 if ( !use_cache )
 305                         mlt_cache_item_close( self->image_cache );
 306                 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.image", self->current_image, image_size, mlt_pool_release );
 307                 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
 308                 self->image_idx = image_idx;
 309
 310                 // Ensure we update the cache when we need to
 311                 update_cache = use_cache;
 312         }
 313
 314         // release references no longer needed
 315         mlt_cache_item_close( qimage_cache );
 316         if ( width == 0 )
 317         {
 318                 pthread_mutex_unlock( &self->mutex );
 319                 mlt_cache_item_close( self->image_cache );
 320         }
 321
 322         // Set width/height of frame
 323         mlt_properties_set_int( properties, "width", self->current_width );
 324         mlt_properties_set_int( properties, "height", self->current_height );
 325         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 326         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 327
 328         if ( update_cache )
 329         {
 330                 mlt_frame cached = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 331                 mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 332                 mlt_properties_set_int( cached_props, "width", self->current_width );
 333                 mlt_properties_set_int( cached_props, "height", self->current_height );
 334                 mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 335                 mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 336                 mlt_properties_set_data( cached_props, "image", self->current_image,
 337                         self->current_width * ( self->current_height + 1 ) * ( self->has_alpha ? 4 : 3 ),
 338                         mlt_pool_release, NULL );
 339                 mlt_properties_set_int( cached_props, "alpha", self->has_alpha );
 340                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 341         }
 342         g_mutex.unlock();
 343 }
 344
 345 extern void make_tempfile( producer_qimage self, const char *xml )
 346 {
 347         // Generate a temporary file for the svg
 348         QTemporaryFile tempFile( "mlt.XXXXXX" );
 349
 350         tempFile.setAutoRemove( false );
 351         if ( tempFile.open() )
 352         {
 353                 // Write the svg into the temp file
 354                 char *fullname = tempFile.fileName().toUtf8().data();
 355
 356                 // Strip leading crap
 357                 while ( xml[0] != '<' )
 358                         xml++;
 359
 360                 qint64 remaining_bytes = strlen( xml );
 361                 while ( remaining_bytes > 0 )
 362                         remaining_bytes -= tempFile.write( xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 363                 tempFile.close();
 364
 365                 mlt_properties_set( self->filenames, "0", fullname );
 366
 367                 mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( &self->parent ), "__temporary_file__",
 368                         fullname, 0, ( mlt_destructor )unlink, NULL );
 369         }
 370 }
 371
 372 } // extern "C"