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>
6 * NB: This module is designed to be functionally equivalent to the
7 * gtk2 image loading module so it can be used as replacement.
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.
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.
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.
24 #include "qimage_wrapper.h"
30 #include <kinstance.h>
38 #include <QtGui/QImage>
39 #include <QtCore/QSysInfo>
47 #include <framework/mlt_pool.h>
50 static KInstance
*instance
= 0L;
53 static void qimage_delete( void *data
)
55 QImage
*image
= ( QImage
* )data
;
58 if (instance
) delete instance
;
63 static void clear_buffered_image( mlt_properties producer_props
, uint8_t **current_image
, uint8_t **current_alpha
)
65 mlt_events_block( producer_props
, NULL
);
66 mlt_properties_set_data( producer_props
, "_qimage_image", NULL
, 0, NULL
, NULL
);
67 mlt_properties_set_data( producer_props
, "_qimage_alpha", NULL
, 0, NULL
, NULL
);
68 *current_image
= NULL
;
69 *current_alpha
= NULL
;
70 mlt_events_unblock( producer_props
, NULL
);
73 static void assign_buffered_image( mlt_properties producer_props
, uint8_t *current_image
, uint8_t *current_alpha
, int width
, int height
)
75 int use_cache
= mlt_properties_get_int( producer_props
, "cache" );
76 mlt_destructor destructor
= use_cache ? NULL
: mlt_pool_release
;
77 mlt_events_block( producer_props
, NULL
);
78 mlt_properties_set_data( producer_props
, "_qimage_image", current_image
, 0, destructor
, NULL
);
79 mlt_properties_set_data( producer_props
, "_qimage_alpha", current_alpha
, 0, destructor
, NULL
);
80 mlt_properties_set_int( producer_props
, "_qimage_width", width
);
81 mlt_properties_set_int( producer_props
, "_qimage_height", height
);
82 mlt_events_unblock( producer_props
, NULL
);
89 instance
= new KInstance("qimage_prod");
90 KImageIO
::registerFormats();
95 void refresh_qimage( mlt_frame frame
, int width
, int height
)
97 // Obtain a previous assigned qimage (if it exists)
98 QImage
*qimage
= ( QImage
* )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame
), "qimage", NULL
);
100 // Obtain properties of frame
101 mlt_properties properties
= MLT_FRAME_PROPERTIES( frame
);
103 // Obtain the producer for this frame
104 producer_qimage self
= ( producer_qimage
)mlt_properties_get_data( properties
, "producer_qimage", NULL
);
106 // Obtain the producer
107 mlt_producer producer
= &self
->parent
;
109 // Obtain properties of producer
110 mlt_properties producer_props
= MLT_PRODUCER_PROPERTIES( producer
);
112 // Obtain the cache flag and structure
113 int use_cache
= mlt_properties_get_int( producer_props
, "cache" );
114 mlt_properties cache
= ( mlt_properties
)mlt_properties_get_data( producer_props
, "_cache", NULL
);
115 int update_cache
= 0;
117 // Retrieve current info if available
118 uint8_t *current_image
= ( uint8_t * )mlt_properties_get_data( producer_props
, "_qimage_image", NULL
);
119 uint8_t *current_alpha
= ( uint8_t * )mlt_properties_get_data( producer_props
, "_qimage_alpha", NULL
);
120 int current_width
= mlt_properties_get_int( producer_props
, "_qimage_width" );
121 int current_height
= mlt_properties_get_int( producer_props
, "_qimage_height" );
123 // Get the time to live for each frame
124 double ttl
= mlt_properties_get_int( producer_props
, "ttl" );
126 // Get the original position of this frame
127 mlt_position position
= mlt_properties_get_position( properties
, "qimage_position" );
128 position
+= mlt_producer_get_in( producer
);
131 int image_idx
= ( int )floor( ( double )position
/ ttl
) % self
->count
;
134 char image_key
[ 10 ];
135 sprintf( image_key
, "%d", image_idx
);
137 // Check if the frame is already loaded
142 cache
= mlt_properties_new( );
143 mlt_properties_set_data( producer_props
, "_cache", cache
, 0, ( mlt_destructor
)mlt_properties_close
, NULL
);
146 mlt_frame cached
= ( mlt_frame
)mlt_properties_get_data( cache
, image_key
, NULL
);
150 self
->image_idx
= image_idx
;
151 mlt_properties cached_props
= MLT_FRAME_PROPERTIES( cached
);
152 current_width
= mlt_properties_get_int( cached_props
, "width" );
153 current_height
= mlt_properties_get_int( cached_props
, "height" );
154 mlt_properties_set_int( producer_props
, "_real_width", mlt_properties_get_int( cached_props
, "real_width" ) );
155 mlt_properties_set_int( producer_props
, "_real_height", mlt_properties_get_int( cached_props
, "real_height" ) );
156 current_image
= ( uint8_t * )mlt_properties_get_data( cached_props
, "image", NULL
);
157 current_alpha
= ( uint8_t * )mlt_properties_get_data( cached_props
, "alpha", NULL
);
159 if ( width
!= 0 && ( width
!= current_width
|| height
!= current_height
) )
160 current_image
= NULL
;
162 assign_buffered_image( producer_props
, current_image
, current_alpha
, current_width
, current_height
);
166 // optimization for subsequent iterations on single picture
167 if ( width
!= 0 && current_image
!= NULL
&& image_idx
== self
->image_idx
)
169 if ( width
!= current_width
|| height
!= current_height
)
171 qimage
= ( QImage
* )mlt_properties_get_data( producer_props
, "_qimage", NULL
);
172 clear_buffered_image( producer_props
, ¤t_image
, ¤t_alpha
);
175 else if ( qimage
== NULL
&& ( current_image
== NULL
|| image_idx
!= self
->image_idx
) )
177 clear_buffered_image( producer_props
, ¤t_image
, ¤t_alpha
);
179 self
->image_idx
= image_idx
;
180 qimage
= new QImage( mlt_properties_get_value( self
->filenames
, image_idx
) );
182 if ( !qimage
->isNull( ) )
184 QImage
*frame_copy
= new QImage( *qimage
);
186 // Store the width/height of the pixbuf
187 current_width
= qimage
->width( );
188 current_height
= qimage
->height( );
190 // Register qimage for destruction and reuse
191 mlt_events_block( producer_props
, NULL
);
192 mlt_properties_set_data( producer_props
, "_qimage", qimage
, 0, ( mlt_destructor
)qimage_delete
, NULL
);
193 mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame
), "qimage", frame_copy
, 0, ( mlt_destructor
)qimage_delete
, NULL
);
194 mlt_properties_set_int( producer_props
, "_real_width", current_width
);
195 mlt_properties_set_int( producer_props
, "_real_height", current_height
);
196 mlt_events_unblock( producer_props
, NULL
);
205 // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
206 if ( qimage
&& width
> 0 && current_image
== NULL
)
208 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
211 // QImage has two scaling modes - we'll toggle between them here
212 if ( strcmp( interps
, "tiles" ) == 0 )
214 else if ( strcmp( interps
, "hyper" ) == 0 )
218 // Note - the original qimage is already safe and ready for destruction
219 QImage scaled
= interp
== 0 ? qimage
->scaled( QSize( width
, height
)) : qimage
->scaled( QSize(width
, height
), Qt
::IgnoreAspectRatio
, Qt
::SmoothTransformation
);
220 QImage temp
= scaled
.convertToFormat(QImage
::Format_ARGB32
);
224 // Note - the original qimage is already safe and ready for destruction
225 QImage scaled
= interp
== 0 ? qimage
->scale( width
, height
, QImage
::ScaleFree
) : qimage
->smoothScale( width
, height
, QImage
::ScaleFree
);
226 QImage temp
= scaled
.convertDepth( 32 );
229 // Store width and height
230 current_width
= width
;
231 current_height
= height
;
233 // Allocate/define image
234 current_image
= ( uint8_t * )mlt_pool_alloc( width
* ( height
+ 1 ) * 2 );
236 // Allocate the alpha mask
237 current_alpha
= ( uint8_t * )mlt_pool_alloc( current_width
* current_height
);
240 if ( QSysInfo
::ByteOrder
== QSysInfo
::BigEndian
)
241 mlt_convert_argb_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
243 mlt_convert_bgr24a_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
248 if ( QImage
::systemByteOrder( ) == QImage
::BigEndian
)
249 mlt_convert_argb_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
251 mlt_convert_bgr24a_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
253 assign_buffered_image( producer_props
, current_image
, current_alpha
, current_width
, current_height
);
255 // Ensure we update the cache when we need to
256 update_cache
= use_cache
;
259 // Set width/height of frame
260 mlt_properties_set_int( properties
, "width", current_width
);
261 mlt_properties_set_int( properties
, "height", current_height
);
262 mlt_properties_set_int( properties
, "real_width", mlt_properties_get_int( producer_props
, "_real_width" ) );
263 mlt_properties_set_int( properties
, "real_height", mlt_properties_get_int( producer_props
, "_real_height" ) );
265 // pass the image data without destructor
266 mlt_properties_set_data( properties
, "image", current_image
, current_width
* ( current_height
+ 1 ) * 2, NULL
, NULL
);
267 mlt_properties_set_data( properties
, "alpha", current_alpha
, current_width
* current_height
, NULL
, NULL
);
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", current_width
);
274 mlt_properties_set_int( cached_props
, "height", 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", current_image
, current_width
* ( current_height
+ 1 ) * 2, mlt_pool_release
, NULL
);
278 mlt_properties_set_data( cached_props
, "alpha", current_alpha
, current_width
* current_height
, mlt_pool_release
, NULL
);
279 mlt_properties_set_data( cache
, image_key
, cached
, 0, ( mlt_destructor
)mlt_frame_close
, NULL
);