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