git.sesse.net Git - mlt/blob - src/modules/qt/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_KDE4
  27 #include <kcomponentdata.h>
  28 #endif
  29
  30 #include <QImage>
  31 #include <QSysInfo>
  32 #include <QApplication>
  33 #include <QMutex>
  34 #include <QtEndian>
  35 #include <QTemporaryFile>
  36 #include <QLocale>
  37
  38 #ifdef USE_EXIF
  39 #include <libexif/exif-data.h>
  40 #endif
  41
  42 #include <cmath>
  43 #include <unistd.h>
  44
  45 extern "C" {
  46
  47 #include <framework/mlt_pool.h>
  48 #include <framework/mlt_cache.h>
  49
  50 #ifdef USE_KDE4
  51 static KComponentData *instance = 0L;
  52 #endif
  53
  54 static QApplication *app = NULL;
  55
  56 static void qimage_delete( void *data )
  57 {
  58         QImage *image = ( QImage * )data;
  59         delete image;
  60         image = NULL;
  61 #if defined(USE_KDE4)
  62         if (instance) delete instance;
  63         instance = 0L;
  64 #endif
  65
  66 }
  67
  68 void init_qimage()
  69 {
  70 #ifdef USE_KDE4
  71         if ( !instance ) {
  72             instance = new KComponentData( "qimage_prod" );
  73         }
  74 #endif
  75
  76 }
  77
  78 static QImage* reorient_with_exif( producer_qimage self, int image_idx, QImage *qimage )
  79 {
  80 #ifdef USE_EXIF
  81         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &self->parent );
  82         ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
  83         ExifEntry *entry;
  84         int exif_orientation = 0;
  85         /* get orientation and rotate image accordingly if necessary */
  86         if (d) {
  87                 if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
  88                         exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
  89
  90                 /* Free the EXIF data */
  91                 exif_data_unref(d);
  92         }
  93
  94         // Remember EXIF value, might be useful for someone
  95         mlt_properties_set_int( producer_props, "_exif_orientation" , exif_orientation );
  96
  97         if ( exif_orientation > 1 )
  98         {
  99                   // Rotate image according to exif data
 100                   QImage processed;
 101                   QMatrix matrix;
 102
 103                   switch ( exif_orientation ) {
 104                   case 2:
 105                           matrix.scale( -1, 1 );
 106                           break;
 107                   case 3:
 108                           matrix.rotate( 180 );
 109                           break;
 110                   case 4:
 111                           matrix.scale( 1, -1 );
 112                           break;
 113                   case 5:
 114                           matrix.rotate( 270 );
 115                           matrix.scale( -1, 1 );
 116                           break;
 117                   case 6:
 118                           matrix.rotate( 90 );
 119                           break;
 120                   case 7:
 121                           matrix.rotate( 90 );
 122                           matrix.scale( -1, 1 );
 123                           break;
 124                   case 8:
 125                           matrix.rotate( 270 );
 126                           break;
 127                   }
 128                   processed = qimage->transformed( matrix );
 129                   delete qimage;
 130                   qimage = new QImage( processed );
 131         }
 132 #endif
 133         return qimage;
 134 }
 135
 136 int refresh_qimage( producer_qimage self, mlt_frame frame )
 137 {
 138         // Obtain properties of frame and producer
 139         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 140         mlt_producer producer = &self->parent;
 141         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 142
 143         // Check if user wants us to reload the image
 144         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
 145         {
 146                 self->qimage = NULL;
 147                 self->current_image = NULL;
 148                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 149         }
 150
 151         // Get the time to live for each frame
 152         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 153
 154         // Get the original position of this frame
 155         mlt_position position = mlt_frame_original_position( frame );
 156         position += mlt_producer_get_in( producer );
 157
 158         // Image index
 159         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 160
 161         // Key for the cache
 162         char image_key[ 10 ];
 163         sprintf( image_key, "%d", image_idx );
 164
 165         int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
 166
 167
 168         if ( app == NULL )
 169         {
 170                 if ( qApp )
 171                 {
 172                         app = qApp;
 173                 }
 174                 else
 175                 {
 176 #ifdef linux
 177                         if ( getenv("DISPLAY") == 0 )
 178                         {
 179                                 mlt_log_panic( MLT_PRODUCER_SERVICE( producer ), "Error, cannot render titles without an X11 environment.\nPlease either run melt from an X session or use a fake X server like xvfb:\nxvfb-run -a melt (...)\n" );
 180                                 return -1;
 181                         }
 182 #endif
 183                         int argc = 1;
 184                         char* argv[1];
 185                         argv[0] = (char*) "xxx";
 186                         app = new QApplication( argc, argv );
 187                         const char *localename = mlt_properties_get_lcnumeric( MLT_SERVICE_PROPERTIES( MLT_PRODUCER_SERVICE( producer ) ) );
 188                         QLocale::setDefault( QLocale( localename ) );
 189                 }
 190         }
 191
 192         if ( image_idx != self->qimage_idx )
 193                 self->qimage = NULL;
 194         if ( !self->qimage || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif )
 195         {
 196                 self->current_image = NULL;
 197                 QImage *qimage = new QImage( QString::fromUtf8( mlt_properties_get_value( self->filenames, image_idx ) ) );
 198                 self->qimage = qimage;
 199
 200                 if ( !qimage->isNull( ) )
 201                 {
 202                         // Read the exif value for this file
 203                         if ( !disable_exif )
 204                                 qimage = reorient_with_exif( self, image_idx, qimage );
 205
 206                         // Register qimage for destruction and reuse
 207                         mlt_cache_item_close( self->qimage_cache );
 208                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage", qimage, 0, ( mlt_destructor )qimage_delete );
 209                         self->qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
 210                         self->qimage_idx = image_idx;
 211
 212                         // Store the width/height of the qimage
 213                         self->current_width = qimage->width( );
 214                         self->current_height = qimage->height( );
 215
 216                         mlt_events_block( producer_props, NULL );
 217                         mlt_properties_set_int( producer_props, "meta.media.width", self->current_width );
 218                         mlt_properties_set_int( producer_props, "meta.media.height", self->current_height );
 219                         mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
 220                         mlt_events_unblock( producer_props, NULL );
 221                 }
 222                 else
 223                 {
 224                         delete qimage;
 225                         self->qimage = NULL;
 226                 }
 227         }
 228
 229         // Set width/height of frame
 230         mlt_properties_set_int( properties, "width", self->current_width );
 231         mlt_properties_set_int( properties, "height", self->current_height );
 232
 233         return image_idx;
 234 }
 235
 236 void refresh_image( producer_qimage self, mlt_frame frame, mlt_image_format format, int width, int height )
 237 {
 238         // Obtain properties of frame and producer
 239         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 240         mlt_producer producer = &self->parent;
 241
 242         // Get index and qimage
 243         int image_idx = refresh_qimage( self, frame );
 244
 245         // optimization for subsequent iterations on single pictur
 246         if ( image_idx != self->image_idx || width != self->current_width || height != self->current_height )
 247                 self->current_image = NULL;
 248
 249         // If we have a qimage and need a new scaled image
 250         if ( self->qimage && ( !self->current_image || ( format != mlt_image_none  && format != self->format ) ) )
 251         {
 252                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 253                 int interp = 0;
 254                 QImage *qimage = static_cast<QImage*>( self->qimage );
 255
 256                 // QImage has two scaling modes - we'll toggle between them here
 257                 if ( strcmp( interps, "tiles" ) == 0
 258                         || strcmp( interps, "hyper" ) == 0
 259                         || strcmp( interps, "bicubic" ) == 0 )
 260                         interp = 1;
 261
 262                 // Note - the original qimage is already safe and ready for destruction
 263                 if ( qimage->depth() == 1 )
 264                 {
 265                         QImage temp = qimage->convertToFormat( QImage::Format_RGB32 );
 266                         delete qimage;
 267                         qimage = new QImage( temp );
 268                         self->qimage = qimage;
 269                 }
 270                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height ) ) :
 271                         qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
 272                 int has_alpha = scaled.hasAlphaChannel();
 273
 274                 // Store width and height
 275                 self->current_width = width;
 276                 self->current_height = height;
 277
 278                 // Allocate/define image
 279                 int dst_stride = width * ( has_alpha ? 4 : 3 );
 280                 int image_size = dst_stride * ( height + 1 );
 281                 self->current_image = ( uint8_t * )mlt_pool_alloc( image_size );
 282                 self->current_alpha = NULL;
 283                 self->format = has_alpha ? mlt_image_rgb24a : mlt_image_rgb24;
 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 ( has_alpha ) *dst++ = qAlpha(*src);
 298                                 ++src;
 299                         }
 300                 }
 301
 302                 // Convert image to requested format
 303                 if ( format != mlt_image_none && format != self->format )
 304                 {
 305                         uint8_t *buffer = NULL;
 306
 307                         // First, set the image so it can be converted when we get it
 308                         mlt_frame_replace_image( frame, self->current_image, self->format, width, height );
 309                         mlt_frame_set_image( frame, self->current_image, image_size, mlt_pool_release );
 310                         self->format = format;
 311
 312                         // get_image will do the format conversion
 313                         mlt_frame_get_image( frame, &buffer, &format, &width, &height, 0 );
 314
 315                         // cache copies of the image and alpha buffers
 316                         if ( buffer )
 317                         {
 318                                 image_size = mlt_image_format_size( format, width, height, NULL );
 319                                 self->current_image = (uint8_t*) mlt_pool_alloc( image_size );
 320                                 memcpy( self->current_image, buffer, image_size );
 321                         }
 322                         if ( ( buffer = mlt_frame_get_alpha_mask( frame ) ) )
 323                         {
 324                                 self->current_alpha = (uint8_t*) mlt_pool_alloc( width * height );
 325                                 memcpy( self->current_alpha, buffer, width * height );
 326                         }
 327                 }
 328
 329                 // Update the cache
 330                 mlt_cache_item_close( self->image_cache );
 331                 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.image", self->current_image, image_size, mlt_pool_release );
 332                 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
 333                 self->image_idx = image_idx;
 334                 mlt_cache_item_close( self->alpha_cache );
 335                 self->alpha_cache = NULL;
 336                 if ( self->current_alpha )
 337                 {
 338                         mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.alpha", self->current_alpha, width * height, mlt_pool_release );
 339                         self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.alpha" );
 340                 }
 341         }
 342
 343         // Set width/height of frame
 344         mlt_properties_set_int( properties, "width", self->current_width );
 345         mlt_properties_set_int( properties, "height", self->current_height );
 346 }
 347
 348 extern void make_tempfile( producer_qimage self, const char *xml )
 349 {
 350         // Generate a temporary file for the svg
 351         QTemporaryFile tempFile( "mlt.XXXXXX" );
 352
 353         tempFile.setAutoRemove( false );
 354         if ( tempFile.open() )
 355         {
 356                 // Write the svg into the temp file
 357                 char *fullname = tempFile.fileName().toUtf8().data();
 358
 359                 // Strip leading crap
 360                 while ( xml[0] != '<' )
 361                         xml++;
 362
 363                 qint64 remaining_bytes = strlen( xml );
 364                 while ( remaining_bytes > 0 )
 365                         remaining_bytes -= tempFile.write( xml + strlen( xml ) - remaining_bytes, remaining_bytes );
 366                 tempFile.close();
 367
 368                 mlt_properties_set( self->filenames, "0", fullname );
 369
 370                 mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( &self->parent ), "__temporary_file__",
 371                         fullname, 0, ( mlt_destructor )unlink, NULL );
 372         }
 373 }
 374
 375 } // extern "C"