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"
31 #include <kinstance.h>
39 #include <QtGui/QImage>
40 #include <QtCore/QSysInfo>
41 #include <QtCore/QMutex>
42 #include <QtCore/QtEndian>
50 #include <framework/mlt_pool.h>
51 #include <framework/mlt_cache.h>
54 static KInstance *instance = 0L;
57 static void qimage_delete( void *data )
59 QImage *image = ( QImage * )data;
63 if (instance) delete instance;
68 static QMutex g_mutex;
74 instance = new KInstance("qimage_prod");
75 KImageIO::registerFormats();
80 void refresh_qimage( producer_qimage self, mlt_frame frame, int width, int height )
82 // Obtain properties of frame
83 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
85 // Obtain the producer
86 mlt_producer producer = &self->parent;
88 // Obtain properties of producer
89 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
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 ) );
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 ) );
100 // Check if user wants us to reload the image
101 if ( mlt_properties_get_int( producer_props, "force_reload" ) )
104 self->current_image = NULL;
105 mlt_properties_set_int( producer_props, "force_reload", 0 );
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;
113 // Get the time to live for each frame
114 double ttl = mlt_properties_get_int( producer_props, "ttl" );
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 );
121 int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
124 char image_key[ 10 ];
125 sprintf( image_key, "%d", image_idx );
129 // Check if the frame is already loaded
134 cache = mlt_properties_new( );
135 mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
138 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
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" );
151 if ( width != 0 && ( width != self->current_width || height != self->current_height ) )
152 self->current_image = NULL;
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 )
161 if ( !qimage && !self->current_image )
163 self->current_image = NULL;
164 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
166 if ( !qimage->isNull( ) )
168 // Store the width/height of the qimage
169 self->current_width = qimage->width( );
170 self->current_height = qimage->height( );
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;
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 );
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 )
193 char *interps = mlt_properties_get( properties, "rescale.interp" );
196 // QImage has two scaling modes - we'll toggle between them here
197 if ( strcmp( interps, "tiles" ) == 0 )
199 else if ( strcmp( interps, "hyper" ) == 0 )
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 );
207 self->has_alpha = scaled.hasAlphaChannel();
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 );
217 // Store width and height
218 self->current_width = width;
219 self->current_height = height;
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 );
227 int y = self->current_height + 1;
228 uint8_t *dst = self->current_image;
231 QRgb *src = (QRgb*) scaled.scanLine( self->current_height - y );
232 int x = self->current_width + 1;
236 *dst++ = qGreen(*src);
237 *dst++ = qBlue(*src);
238 if ( self->has_alpha ) *dst++ = qAlpha(*src);
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;
250 // Ensure we update the cache when we need to
251 update_cache = use_cache;
254 // release references no longer needed
255 mlt_cache_item_close( qimage_cache );
258 pthread_mutex_unlock( &self->mutex );
259 mlt_cache_item_close( self->image_cache );
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" ) );
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 );