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 #endif
  43
  44
  45 #include <cmath>
  46
  47 extern "C" {
  48
  49 #include <framework/mlt_pool.h>
  50
  51 #ifdef USE_KDE
  52 static KInstance *instance = 0L;
  53 #endif
  54
  55 static void qimage_delete( void *data )
  56 {
  57         QImage *image = ( QImage * )data;
  58         delete image;
  59         image = NULL;
  60 #ifdef USE_KDE
  61         if (instance) delete instance;
  62         instance = 0L;
  63 #endif
  64 }
  65
  66 QMutex mutex;
  67
  68 #ifdef USE_KDE
  69 void init_qimage()
  70 {
  71         if (!instance) {
  72             instance = new KInstance("qimage_prod");
  73             KImageIO::registerFormats();
  74         }
  75 }
  76 #endif
  77
  78 void refresh_qimage( mlt_frame frame, int width, int height )
  79 {
  80         // Obtain a previous assigned qimage (if it exists)
  81         QImage *qimage = static_cast <QImage *>(mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL ));
  82
  83         // Obtain properties of frame
  84         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  85
  86         // Obtain the producer for this frame
  87         producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
  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         // Obtain the cache flag and structure
  96         int use_cache = mlt_properties_get_int( producer_props, "cache" );
  97         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
  98         int update_cache = 0;
  99
 100         // Get the time to live for each frame
 101         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 102
 103         // Get the original position of this frame
 104         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 105         position += mlt_producer_get_in( producer );
 106
 107         // Image index
 108         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 109
 110         // Key for the cache
 111         char image_key[ 10 ];
 112         sprintf( image_key, "%d", image_idx );
 113
 114         mutex.lock();
 115
 116         // Check if the frame is already loaded
 117         if ( use_cache )
 118         {
 119                 if ( cache == NULL )
 120                 {
 121                         cache = mlt_properties_new( );
 122                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 123                 }
 124
 125                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 126
 127                 if ( cached )
 128                 {
 129                         self->image_idx = image_idx;
 130                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 131                         self->current_width = mlt_properties_get_int( cached_props, "width" );
 132                         self->current_height = mlt_properties_get_int( cached_props, "height" );
 133                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 134                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 135                         self->current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 136                         self->current_alpha = ( uint8_t * )mlt_properties_get_data( cached_props, "alpha", NULL );
 137
 138                         if ( width != 0 && ( width != self->current_width || height != self->current_height ) )
 139                                 self->current_image = NULL;
 140                 }
 141         }
 142
 143     // optimization for subsequent iterations on single picture
 144         if ( width != 0 && self->current_image != NULL && image_idx == self->image_idx )
 145         {
 146                 if ( width != self->current_width || height != self->current_height )
 147                 {
 148                         qimage = static_cast<QImage *>(mlt_properties_get_data( producer_props, "_qimage", NULL ));
 149                         if ( !use_cache )
 150                         {
 151                                 mlt_pool_release( self->current_image );
 152                                 mlt_pool_release( self->current_alpha );
 153                         }
 154                         self->current_image = NULL;
 155                         self->current_alpha = NULL;
 156                 }
 157         }
 158         else if ( qimage == NULL && ( self->current_image == NULL || image_idx != self->image_idx ) )
 159         {
 160                 if ( !use_cache )
 161                 {
 162                         mlt_pool_release( self->current_image );
 163                         mlt_pool_release( self->current_alpha );
 164                 }
 165                 self->current_image = NULL;
 166                 self->current_alpha = NULL;
 167
 168                 self->image_idx = image_idx;
 169                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 170
 171                 if ( !qimage->isNull( ) )
 172                 {
 173                         QImage *frame_copy = new QImage( *qimage );
 174
 175                         // Store the width/height of the pixbuf
 176                         self->current_width = qimage->width( );
 177                         self->current_height = qimage->height( );
 178
 179                         // Register qimage for destruction and reuse
 180                         mlt_events_block( producer_props, NULL );
 181                         mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
 182                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
 183                         mlt_properties_set_int( producer_props, "_real_width", self->current_width );
 184                         mlt_properties_set_int( producer_props, "_real_height", self->current_height );
 185                         mlt_events_unblock( producer_props, NULL );
 186                 }
 187                 else
 188                 {
 189                         delete qimage;
 190                         qimage = NULL;
 191                 }
 192         }
 193
 194         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 195         if ( qimage && width > 0 && self->current_image == NULL )
 196         {
 197                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 198                 int interp = 0;
 199
 200                 // QImage has two scaling modes - we'll toggle between them here
 201                 if ( strcmp( interps, "tiles" ) == 0 )
 202                         interp = 1;
 203                 else if ( strcmp( interps, "hyper" ) == 0 )
 204                         interp = 1;
 205
 206 #ifdef USE_QT4
 207                 // Note - the original qimage is already safe and ready for destruction
 208                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height)) : qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 209                 QImage temp;
 210                 bool hasAlpha = scaled.hasAlphaChannel();
 211                 if (hasAlpha)
 212                     temp = scaled.convertToFormat(QImage::Format_ARGB32);
 213                 else
 214                     temp = scaled.convertToFormat(QImage::Format_RGB888);
 215 #endif
 216
 217 #ifdef USE_QT3
 218                 // Note - the original qimage is already safe and ready for destruction
 219                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
 220                 QImage temp = scaled.convertDepth( 32 );
 221                 bool hasAlpha = true;
 222 #endif
 223
 224                 // Store width and height
 225                 self->current_width = width;
 226                 self->current_height = height;
 227
 228                 // Allocate/define image
 229                 self->current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
 230
 231
 232                 if (!hasAlpha) {
 233                         mlt_convert_rgb24_to_yuv422( temp.bits(), self->current_width, self->current_height, temp.bytesPerLine(), self->current_image );
 234                 }
 235                 else {
 236                         // Allocate the alpha mask
 237                         self->current_alpha = ( uint8_t * )mlt_pool_alloc( self->current_width * self->current_height );
 238 #ifdef USE_QT4
 239                         if ( QSysInfo::ByteOrder == QSysInfo::BigEndian )
 240                                 mlt_convert_argb_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine(), self->current_image, self->current_alpha );
 241                         else
 242                                 mlt_convert_bgr24a_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 243 #endif
 244
 245 #ifdef USE_QT3
 246                         // Convert the image
 247                         if ( QImage::systemByteOrder( ) == QImage::BigEndian )
 248                                 mlt_convert_argb_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 249                         else
 250                                 mlt_convert_bgr24a_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 251 #endif
 252                 }
 253
 254                 // Ensure we update the cache when we need to
 255                 update_cache = use_cache;
 256         }
 257
 258         // Set width/height of frame
 259         mlt_properties_set_int( properties, "width", self->current_width );
 260         mlt_properties_set_int( properties, "height", self->current_height );
 261         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 262         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 263
 264         // pass the image data without destructor
 265         mlt_properties_set_data( properties, "image", self->current_image, self->current_width * ( self->current_height + 1 ) * 2, NULL, NULL );
 266         mlt_properties_set_data( properties, "alpha", self->current_alpha, self->current_width * self->current_height, NULL, NULL );
 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, self->current_width * ( self->current_height + 1 ) * 2, mlt_pool_release, NULL );
 277                 mlt_properties_set_data( cached_props, "alpha", self->current_alpha, self->current_width * self->current_height, mlt_pool_release, NULL );
 278                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 279         }
 280         mutex.unlock();
 281     }
 282 }
 283