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 #endif
  44
  45 #ifdef USE_EXIF
  46 #include <libexif/exif-data.h>
  47 #endif
  48
  49 #include <cmath>
  50
  51 extern "C" {
  52
  53 #include <framework/mlt_pool.h>
  54 #include <framework/mlt_cache.h>
  55
  56 #ifdef USE_KDE
  57 static KInstance *instance = 0L;
  58 #endif
  59
  60 static void qimage_delete( void *data )
  61 {
  62         QImage *image = ( QImage * )data;
  63         delete image;
  64         image = NULL;
  65 #ifdef USE_KDE
  66         if (instance) delete instance;
  67         instance = 0L;
  68 #endif
  69 }
  70
  71 static QMutex g_mutex;
  72
  73 #ifdef USE_KDE
  74 void init_qimage()
  75 {
  76         if (!instance) {
  77             instance = new KInstance("qimage_prod");
  78             KImageIO::registerFormats();
  79         }
  80 }
  81 #endif
  82
  83 void refresh_qimage( producer_qimage self, mlt_frame frame, int width, int height )
  84 {
  85         // Obtain properties of frame
  86         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  87
  88         // Obtain the producer
  89         mlt_producer producer = &self->parent;
  90
  91         // Obtain properties of producer
  92         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
  93
  94         // restore QImage
  95         pthread_mutex_lock( &self->mutex );
  96         mlt_cache_item qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
  97         QImage *qimage = static_cast<QImage*>( mlt_cache_item_data( qimage_cache, NULL ) );
  98
  99         // restore scaled image
 100         self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
 101         self->current_image = static_cast<uint8_t*>( mlt_cache_item_data( self->image_cache, NULL ) );
 102
 103         // Check if user wants us to reload the image
 104         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
 105         {
 106                 qimage = NULL;
 107                 self->current_image = NULL;
 108                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 109         }
 110
 111         // Obtain the cache flag and structure
 112         int use_cache = mlt_properties_get_int( producer_props, "cache" );
 113         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
 114         int update_cache = 0;
 115
 116         // Get the time to live for each frame
 117         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 118
 119         // Get the original position of this frame
 120         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 121         position += mlt_producer_get_in( producer );
 122
 123         // Image index
 124         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 125
 126         // Key for the cache
 127         char image_key[ 10 ];
 128         sprintf( image_key, "%d", image_idx );
 129
 130         g_mutex.lock();
 131
 132         // Check if the frame is already loaded
 133         if ( use_cache )
 134         {
 135                 if ( cache == NULL )
 136                 {
 137                         cache = mlt_properties_new( );
 138                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 139                 }
 140
 141                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 142
 143                 if ( cached )
 144                 {
 145                         self->image_idx = image_idx;
 146                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 147                         self->current_width = mlt_properties_get_int( cached_props, "width" );
 148                         self->current_height = mlt_properties_get_int( cached_props, "height" );
 149                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 150                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 151                         self->current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 152                         self->has_alpha = mlt_properties_get_int( cached_props, "alpha" );
 153
 154                         if ( width != 0 && ( width != self->current_width || height != self->current_height ) )
 155                                 self->current_image = NULL;
 156                 }
 157         }
 158
 159         int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
 160
 161         // optimization for subsequent iterations on single pictur
 162         if ( width != 0 && ( image_idx != self->image_idx || width != self->current_width || height != self->current_height ) )
 163                 self->current_image = NULL;
 164         if ( image_idx != self->qimage_idx )
 165                 qimage = NULL;
 166
 167         if ( !qimage || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif)
 168         {
 169                 self->current_image = NULL;
 170                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 171
 172                 if ( !qimage->isNull( ) )
 173                 {
 174 #ifdef USE_EXIF
 175                         // Read the exif value for this file
 176                         if ( disable_exif == 0) {
 177                                 ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
 178                                 ExifEntry *entry;
 179                                 int exif_orientation = 0;
 180                                 /* get orientation and rotate image accordingly if necessary */
 181                                 if (d) {
 182                                         if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
 183                                                 exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
 184
 185                                         /* Free the EXIF data */
 186                                         exif_data_unref(d);
 187                                 }
 188
 189                                 if ( exif_orientation > 1 )
 190                                 {
 191                                       // Rotate image according to exif data
 192                                       QImage processed;
 193                                       QMatrix matrix;
 194
 195                                       switch ( exif_orientation ) {
 196                                           case 2:
 197                                               matrix.scale( -1, 1 );
 198                                               break;
 199                                           case 3:
 200                                               matrix.rotate( 180 );
 201                                               break;
 202                                           case 4:
 203                                               matrix.scale( 1, -1 );
 204                                               break;
 205                                           case 5:
 206                                               matrix.rotate( 270 );
 207                                               matrix.scale( -1, 1 );
 208                                               break;
 209                                           case 6:
 210                                               matrix.rotate( 90 );
 211                                               break;
 212                                           case 7:
 213                                               matrix.rotate( 90 );
 214                                               matrix.scale( -1, 1 );
 215                                               break;
 216                                           case 8:
 217                                               matrix.rotate( 270 );
 218                                               break;
 219                                       }
 220                                       processed = qimage->transformed( matrix );
 221                                       delete qimage;
 222                                       qimage = new QImage( processed );
 223                                 }
 224                         }
 225 #endif
 226                         // Store the width/height of the qimage
 227                         self->current_width = qimage->width( );
 228                         self->current_height = qimage->height( );
 229
 230                         // Register qimage for destruction and reuse
 231                         mlt_cache_item_close( qimage_cache );
 232                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage", qimage, 0, ( mlt_destructor )qimage_delete );
 233                         qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
 234                         self->qimage_idx = image_idx;
 235
 236                         mlt_events_block( producer_props, NULL );
 237                         mlt_properties_set_int( producer_props, "_real_width", self->current_width );
 238                         mlt_properties_set_int( producer_props, "_real_height", self->current_height );
 239                         mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
 240                         mlt_events_unblock( producer_props, NULL );
 241                 }
 242                 else
 243                 {
 244                         delete qimage;
 245                         qimage = NULL;
 246                 }
 247         }
 248
 249         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 250         if ( qimage && width > 0 && !self->current_image )
 251         {
 252                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 253                 int interp = 0;
 254
 255                 // QImage has two scaling modes - we'll toggle between them here
 256                 if ( strcmp( interps, "tiles" ) == 0 )
 257                         interp = 1;
 258                 else if ( strcmp( interps, "hyper" ) == 0 )
 259                         interp = 1;
 260
 261 #ifdef USE_QT4
 262                 // Note - the original qimage is already safe and ready for destruction
 263                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height ) ) :
 264                         qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
 265                 QImage temp;
 266                 self->has_alpha = scaled.hasAlphaChannel();
 267 #endif
 268
 269 #ifdef USE_QT3
 270                 // Note - the original qimage is already safe and ready for destruction
 271                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) :
 272                         qimage->smoothScale( width, height, QImage::ScaleFree );
 273                 self->has_alpha = 1;
 274 #endif
 275
 276                 // Store width and height
 277                 self->current_width = width;
 278                 self->current_height = height;
 279
 280                 // Allocate/define image
 281                 int dst_stride = width * ( self->has_alpha ? 4 : 3 );
 282                 int image_size = dst_stride * ( height + 1 );
 283                 self->current_image = ( uint8_t * )mlt_pool_alloc( image_size );
 284
 285                 // Copy the image
 286                 int y = self->current_height + 1;
 287                 uint8_t *dst = self->current_image;
 288                 while ( --y )
 289                 {
 290                         QRgb *src = (QRgb*) scaled.scanLine( self->current_height - y );
 291                         int x = self->current_width + 1;
 292                         while ( --x )
 293                         {
 294                                 *dst++ = qRed(*src);
 295                                 *dst++ = qGreen(*src);
 296                                 *dst++ = qBlue(*src);
 297                                 if ( self->has_alpha ) *dst++ = qAlpha(*src);
 298                                 ++src;
 299                         }
 300                 }
 301
 302                 // Update the cache
 303                 if ( !use_cache )
 304                         mlt_cache_item_close( self->image_cache );
 305                 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.image", self->current_image, image_size, mlt_pool_release );
 306                 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
 307                 self->image_idx = image_idx;
 308
 309                 // Ensure we update the cache when we need to
 310                 update_cache = use_cache;
 311         }
 312
 313         // release references no longer needed
 314         mlt_cache_item_close( qimage_cache );
 315         if ( width == 0 )
 316         {
 317                 pthread_mutex_unlock( &self->mutex );
 318                 mlt_cache_item_close( self->image_cache );
 319         }
 320
 321         // Set width/height of frame
 322         mlt_properties_set_int( properties, "width", self->current_width );
 323         mlt_properties_set_int( properties, "height", self->current_height );
 324         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 325         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 326
 327         if ( update_cache )
 328         {
 329                 mlt_frame cached = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 330                 mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 331                 mlt_properties_set_int( cached_props, "width", self->current_width );
 332                 mlt_properties_set_int( cached_props, "height", self->current_height );
 333                 mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 334                 mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 335                 mlt_properties_set_data( cached_props, "image", self->current_image,
 336                         self->current_width * ( self->current_height + 1 ) * ( self->has_alpha ? 4 : 3 ),
 337                         mlt_pool_release, NULL );
 338                 mlt_properties_set_int( cached_props, "alpha", self->has_alpha );
 339                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 340         }
 341         g_mutex.unlock();
 342 }
 343
 344 } // extern "C"