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