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"
28 #include <kcomponentdata.h>
35 #include <QTemporaryFile>
38 #include <libexif/exif-data.h>
46 #include <framework/mlt_pool.h>
47 #include <framework/mlt_cache.h>
50 static KComponentData *instance = 0L;
53 static void qimage_delete( void *data )
55 QImage *image = ( QImage * )data;
59 if (instance) delete instance;
69 instance = new KComponentData( "qimage_prod" );
75 static QImage* reorient_with_exif( producer_qimage self, int image_idx, QImage *qimage )
78 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( &self->parent );
79 ExifData *d = exif_data_new_from_file( mlt_properties_get_value( self->filenames, image_idx ) );
81 int exif_orientation = 0;
82 /* get orientation and rotate image accordingly if necessary */
84 if ( ( entry = exif_content_get_entry ( d->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION ) ) )
85 exif_orientation = exif_get_short (entry->data, exif_data_get_byte_order (d));
87 /* Free the EXIF data */
91 // Remember EXIF value, might be useful for someone
92 mlt_properties_set_int( producer_props, "_exif_orientation" , exif_orientation );
94 if ( exif_orientation > 1 )
96 // Rotate image according to exif data
100 switch ( exif_orientation ) {
102 matrix.scale( -1, 1 );
105 matrix.rotate( 180 );
108 matrix.scale( 1, -1 );
111 matrix.rotate( 270 );
112 matrix.scale( -1, 1 );
119 matrix.scale( -1, 1 );
122 matrix.rotate( 270 );
125 processed = qimage->transformed( matrix );
127 qimage = new QImage( processed );
133 int refresh_qimage( producer_qimage self, mlt_frame frame )
135 // Obtain properties of frame and producer
136 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
137 mlt_producer producer = &self->parent;
138 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
140 // Check if user wants us to reload the image
141 if ( mlt_properties_get_int( producer_props, "force_reload" ) )
144 self->current_image = NULL;
145 mlt_properties_set_int( producer_props, "force_reload", 0 );
148 // Get the time to live for each frame
149 double ttl = mlt_properties_get_int( producer_props, "ttl" );
151 // Get the original position of this frame
152 mlt_position position = mlt_frame_original_position( frame );
153 position += mlt_producer_get_in( producer );
156 int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
159 char image_key[ 10 ];
160 sprintf( image_key, "%d", image_idx );
162 int disable_exif = mlt_properties_get_int( producer_props, "disable_exif" );
164 if ( !createQApplicationIfNeeded( MLT_PRODUCER_SERVICE(producer) ) )
167 if ( image_idx != self->qimage_idx )
169 if ( !self->qimage || mlt_properties_get_int( producer_props, "_disable_exif" ) != disable_exif )
171 self->current_image = NULL;
172 QImage *qimage = new QImage( QString::fromUtf8( mlt_properties_get_value( self->filenames, image_idx ) ) );
173 self->qimage = qimage;
175 if ( !qimage->isNull( ) )
177 // Read the exif value for this file
179 qimage = reorient_with_exif( self, image_idx, qimage );
181 // Register qimage for destruction and reuse
182 mlt_cache_item_close( self->qimage_cache );
183 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage", qimage, 0, ( mlt_destructor )qimage_delete );
184 self->qimage_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.qimage" );
185 self->qimage_idx = image_idx;
187 // Store the width/height of the qimage
188 self->current_width = qimage->width( );
189 self->current_height = qimage->height( );
191 mlt_events_block( producer_props, NULL );
192 mlt_properties_set_int( producer_props, "meta.media.width", self->current_width );
193 mlt_properties_set_int( producer_props, "meta.media.height", self->current_height );
194 mlt_properties_set_int( producer_props, "_disable_exif", disable_exif );
195 mlt_events_unblock( producer_props, NULL );
204 // Set width/height of frame
205 mlt_properties_set_int( properties, "width", self->current_width );
206 mlt_properties_set_int( properties, "height", self->current_height );
211 void refresh_image( producer_qimage self, mlt_frame frame, mlt_image_format format, int width, int height )
213 // Obtain properties of frame and producer
214 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
215 mlt_producer producer = &self->parent;
217 // Get index and qimage
218 int image_idx = refresh_qimage( self, frame );
220 // optimization for subsequent iterations on single pictur
221 if ( image_idx != self->image_idx || width != self->current_width || height != self->current_height )
222 self->current_image = NULL;
224 // If we have a qimage and need a new scaled image
225 if ( self->qimage && ( !self->current_image || ( format != mlt_image_none && format != self->format ) ) )
227 QString interps = mlt_properties_get( properties, "rescale.interp" );
228 bool interp = ( interps != "nearest" ) && ( interps != "none" );
229 QImage *qimage = static_cast<QImage*>( self->qimage );
231 // Note - the original qimage is already safe and ready for destruction
232 if ( qimage->depth() == 1 )
234 QImage temp = qimage->convertToFormat( QImage::Format_RGB32 );
236 qimage = new QImage( temp );
237 self->qimage = qimage;
239 QImage scaled = interp? qimage->scaled( QSize( width, height ) ) :
240 qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation );
241 int has_alpha = scaled.hasAlphaChannel();
243 // Store width and height
244 self->current_width = width;
245 self->current_height = height;
247 // Allocate/define image
248 int dst_stride = width * ( has_alpha ? 4 : 3 );
249 int image_size = dst_stride * ( height + 1 );
250 self->current_image = ( uint8_t * )mlt_pool_alloc( image_size );
251 self->current_alpha = NULL;
252 self->format = has_alpha ? mlt_image_rgb24a : mlt_image_rgb24;
255 int y = self->current_height + 1;
256 uint8_t *dst = self->current_image;
259 QRgb *src = (QRgb*) scaled.scanLine( self->current_height - y );
260 int x = self->current_width + 1;
264 *dst++ = qGreen(*src);
265 *dst++ = qBlue(*src);
266 if ( has_alpha ) *dst++ = qAlpha(*src);
271 // Convert image to requested format
272 if ( format != mlt_image_none && format != self->format )
274 uint8_t *buffer = NULL;
276 // First, set the image so it can be converted when we get it
277 mlt_frame_replace_image( frame, self->current_image, self->format, width, height );
278 mlt_frame_set_image( frame, self->current_image, image_size, mlt_pool_release );
279 self->format = format;
281 // get_image will do the format conversion
282 mlt_frame_get_image( frame, &buffer, &format, &width, &height, 0 );
284 // cache copies of the image and alpha buffers
287 image_size = mlt_image_format_size( format, width, height, NULL );
288 self->current_image = (uint8_t*) mlt_pool_alloc( image_size );
289 memcpy( self->current_image, buffer, image_size );
291 if ( ( buffer = mlt_frame_get_alpha_mask( frame ) ) )
293 self->current_alpha = (uint8_t*) mlt_pool_alloc( width * height );
294 memcpy( self->current_alpha, buffer, width * height );
299 mlt_cache_item_close( self->image_cache );
300 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.image", self->current_image, image_size, mlt_pool_release );
301 self->image_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.image" );
302 self->image_idx = image_idx;
303 mlt_cache_item_close( self->alpha_cache );
304 self->alpha_cache = NULL;
305 if ( self->current_alpha )
307 mlt_service_cache_put( MLT_PRODUCER_SERVICE( producer ), "qimage.alpha", self->current_alpha, width * height, mlt_pool_release );
308 self->alpha_cache = mlt_service_cache_get( MLT_PRODUCER_SERVICE( producer ), "qimage.alpha" );
312 // Set width/height of frame
313 mlt_properties_set_int( properties, "width", self->current_width );
314 mlt_properties_set_int( properties, "height", self->current_height );
317 extern void make_tempfile( producer_qimage self, const char *xml )
319 // Generate a temporary file for the svg
320 QTemporaryFile tempFile( "mlt.XXXXXX" );
322 tempFile.setAutoRemove( false );
323 if ( tempFile.open() )
325 // Write the svg into the temp file
326 char *fullname = tempFile.fileName().toUtf8().data();
328 // Strip leading crap
329 while ( xml[0] != '<' )
332 qint64 remaining_bytes = strlen( xml );
333 while ( remaining_bytes > 0 )
334 remaining_bytes -= tempFile.write( xml + strlen( xml ) - remaining_bytes, remaining_bytes );
337 mlt_properties_set( self->filenames, "0", fullname );
339 mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( &self->parent ), "__temporary_file__",
340 fullname, 0, ( mlt_destructor )unlink, NULL );