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>
43 #include <QtCore/QTemporaryFile>
47 #include <libexif/exif-data.h>
55 #include <framework/mlt_pool.h>
56 #include <framework/mlt_cache.h>
59 static KInstance *instance = 0L;
62 static void qimage_delete( void *data )
64 QImage *image = ( QImage * )data;
68 if (instance) delete instance;
77 instance = new KInstance("qimage_prod");
78 KImageIO::registerFormats();
83 static QImage* reorient_with_exif( producer_qimage self, int image_idx, QImage *qimage )
86 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &self->parent );
87 ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
89 int exif_orientation = 0;
90 /* get orientation and rotate image accordingly if necessary */
92 if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
93 exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
95 /* Free the EXIF data */
99 // Remember EXIF value, might be useful for someone
100 mlt_properties_set_int( producer_props, "_exif_orientation" , exif_orientation );
102 if ( exif_orientation > 1 )
104 // Rotate image according to exif data
108 switch ( exif_orientation ) {
110 matrix.scale( -1, 1 );
113 matrix.rotate( 180 );
116 matrix.scale( 1, -1 );
119 matrix.rotate( 270 );
120 matrix.scale( -1, 1 );
127 matrix.scale( -1, 1 );
130 matrix.rotate( 270 );
133 processed = qimage->transformed( matrix );
135 qimage = new QImage( processed );
141 int refresh_qimage( producer_qimage self, mlt_frame frame )
143 // Obtain properties of frame and producer
144 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
145 mlt_producer producer = &self->parent;
146 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
148 // Check if user wants us to reload the image
149 if ( mlt_properties_get_int( producer_props, "force_reload" ) )
152 self->current_image = NULL;
153 mlt_properties_set_int( producer_props, "force_reload", 0 );
156 // Get the time to live for each frame
157 double ttl = mlt_properties_get_int( producer_props, "ttl" );
159 // Get the original position of this frame
160 mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
161 position += mlt_producer_get_in( producer );
164 int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
167 char image_key[ 10 ];
168 sprintf( image_key, "%d", image_idx );
170 int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
172 if ( image_idx != self->qimage_idx )
174 if ( !self->qimage || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif )
176 self->current_image = NULL;
177 QImage *qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
178 self->qimage = qimage;
180 if ( !qimage->isNull( ) )
182 // Read the exif value for this file
184 qimage = reorient_with_exif( self, image_idx, qimage );
186 // Register qimage for destruction and reuse
187 mlt_cache_item_close( self->qimage_cache );
188 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage", qimage, 0, ( mlt_destructor )qimage_delete );
189 self->qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
190 self->qimage_idx = image_idx;
192 // Store the width/height of the qimage
193 self->current_width = qimage->width( );
194 self->current_height = qimage->height( );
196 mlt_events_block( producer_props, NULL );
197 mlt_properties_set_int( producer_props, "_real_width", self->current_width );
198 mlt_properties_set_int( producer_props, "_real_height", self->current_height );
199 mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
200 mlt_events_unblock( producer_props, NULL );
209 // Set width/height of frame
210 mlt_properties_set_int( properties, "width", self->current_width );
211 mlt_properties_set_int( properties, "height", self->current_height );
212 mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
213 mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
218 void refresh_image( producer_qimage self, mlt_frame frame, mlt_image_format format, int width, int height )
220 // Obtain properties of frame and producer
221 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
222 mlt_producer producer = &self->parent;
224 // Get index and qimage
225 int image_idx = refresh_qimage( self, frame );
227 // optimization for subsequent iterations on single pictur
228 if ( image_idx != self->image_idx || width != self->current_width || height != self->current_height )
229 self->current_image = NULL;
231 // If we have a qimage and need a new scaled image
232 if ( self->qimage && ( !self->current_image || ( format != mlt_image_none && format != self->format ) ) )
234 char *interps = mlt_properties_get( properties, "rescale.interp" );
236 QImage *qimage = static_cast<QImage*>( self->qimage );
238 // QImage has two scaling modes - we'll toggle between them here
239 if ( strcmp( interps, "tiles" ) == 0
240 || strcmp( interps, "hyper" ) == 0
241 || strcmp( interps, "bicubic" ) == 0 )
245 // Note - the original qimage is already safe and ready for destruction
246 if ( qimage->depth() == 1 )
248 QImage temp = qimage->convertToFormat( QImage::Format_RGB32 );
250 qimage = new QImage( temp );
251 self->qimage = qimage;
253 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height ) ) :
254 qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
255 int has_alpha = scaled.hasAlphaChannel();
259 // Note - the original qimage is already safe and ready for destruction
260 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) :
261 qimage->smoothScale( width, height, QImage::ScaleFree );
265 // Store width and height
266 self->current_width = width;
267 self->current_height = height;
269 // Allocate/define image
270 int dst_stride = width * ( has_alpha ? 4 : 3 );
271 int image_size = dst_stride * ( height + 1 );
272 self->current_image = ( uint8_t * )mlt_pool_alloc( image_size );
273 self->format = has_alpha ? mlt_image_rgb24a : mlt_image_rgb24;
276 int y = self->current_height + 1;
277 uint8_t *dst = self->current_image;
280 QRgb *src = (QRgb*) scaled.scanLine( self->current_height - y );
281 int x = self->current_width + 1;
285 *dst++ = qGreen(*src);
286 *dst++ = qBlue(*src);
287 if ( has_alpha ) *dst++ = qAlpha(*src);
292 // Convert image to requested format
293 if ( format != mlt_image_none && format != self->format )
295 uint8_t *buffer = NULL;
297 // First, set the image so it can be converted when we get it
298 mlt_frame_replace_image( frame, self->current_image, self->format, width, height );
299 mlt_frame_set_image( frame, self->current_image, image_size, mlt_pool_release );
300 self->format = format;
302 // get_image will do the format conversion
303 mlt_frame_get_image( frame, &buffer, &format, &width, &height, 0 );
305 // cache copies of the image and alpha buffers
308 image_size = mlt_image_format_size( format, width, height, NULL );
309 self->current_image = (uint8_t*) mlt_pool_alloc( image_size );
310 memcpy( self->current_image, buffer, image_size );
312 if ( ( buffer = mlt_frame_get_alpha_mask( frame ) ) )
314 self->current_alpha = (uint8_t*) mlt_pool_alloc( width * height );
315 memcpy( self->current_alpha, buffer, width * height );
320 mlt_cache_item_close( self->image_cache );
321 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.image", self->current_image, image_size, mlt_pool_release );
322 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
323 self->image_idx = image_idx;
324 mlt_cache_item_close( self->alpha_cache );
325 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha", self->current_alpha, width * height, mlt_pool_release );
326 self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "pixbuf.alpha" );
329 // Set width/height of frame
330 mlt_properties_set_int( properties, "width", self->current_width );
331 mlt_properties_set_int( properties, "height", self->current_height );
334 extern void make_tempfile( producer_qimage self, const char *xml )
336 // Generate a temporary file for the svg
337 QTemporaryFile tempFile( "mlt.XXXXXX" );
339 tempFile.setAutoRemove( false );
340 if ( tempFile.open() )
342 // Write the svg into the temp file
343 char *fullname = tempFile.fileName().toUtf8().data();
345 // Strip leading crap
346 while ( xml[0] != '<' )
349 qint64 remaining_bytes = strlen( xml );
350 while ( remaining_bytes > 0 )
351 remaining_bytes -= tempFile.write( xml + strlen( xml ) - remaining_bytes, remaining_bytes );
354 mlt_properties_set( self->filenames, "0", fullname );
356 mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( &self->parent ), "__temporary_file__",
357 fullname, 0, ( mlt_destructor )unlink, NULL );