research.m1stereo.tv/gitweb/ - melted/blob - src/modules/qimage/qimage_wrapper.cpp

   1 /*
   2  * qimage_wrapper.cpp -- a QT/QImage based producer for MLT
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   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 #include <qimage.h>
  26 #include <cmath>
  27
  28 extern "C" {
  29
  30 #include <framework/mlt_pool.h>
  31
  32 static void qimage_delete( void *data )
  33 {
  34         QImage *image = ( QImage * )data;
  35         delete image;
  36 }
  37
  38 static void clear_buffered_image( mlt_properties producer_props, uint8_t **current_image, uint8_t **current_alpha )
  39 {
  40         mlt_events_block( producer_props, NULL );
  41         mlt_properties_set_data( producer_props, "_qimage_image", NULL, 0, NULL, NULL );
  42         mlt_properties_set_data( producer_props, "_qimage_alpha", NULL, 0, NULL, NULL );
  43         *current_image = NULL;
  44         *current_alpha = NULL;
  45         mlt_events_unblock( producer_props, NULL );
  46 }
  47
  48 static void assign_buffered_image( mlt_properties producer_props, uint8_t *current_image, uint8_t *current_alpha, int width, int height )
  49 {
  50         mlt_events_block( producer_props, NULL );
  51         mlt_properties_set_data( producer_props, "_qimage_image", current_image, 0, mlt_pool_release, NULL );
  52         mlt_properties_set_data( producer_props, "_qimage_alpha", current_alpha, 0, mlt_pool_release, NULL );
  53         mlt_properties_set_int( producer_props, "_qimage_width", width );
  54         mlt_properties_set_int( producer_props, "_qimage_height", height );
  55         mlt_events_unblock( producer_props, NULL );
  56 }
  57
  58 void refresh_qimage( mlt_frame frame, int width, int height )
  59 {
  60         // Obtain a previous assigned qimage (if it exists)
  61         QImage *qimage = ( QImage * )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL );
  62
  63         // Obtain properties of frame
  64         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  65
  66         // Obtain the producer for this frame
  67         producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
  68
  69         // Obtain the producer
  70         mlt_producer producer = &self->parent;
  71
  72         // Obtain properties of producer
  73         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
  74
  75         // Retrieve current info if available
  76         uint8_t *current_image = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_image", NULL );
  77         uint8_t *current_alpha = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_alpha", NULL );
  78         int current_width = mlt_properties_get_int( producer_props, "_qimage_width" );
  79         int current_height = mlt_properties_get_int( producer_props, "_qimage_height" );
  80
  81         // Get the time to live for each frame
  82         double ttl = mlt_properties_get_int( producer_props, "ttl" );
  83
  84         // Get the original position of this frame
  85         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
  86
  87         // Image index
  88         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
  89
  90     // optimization for subsequent iterations on single picture
  91         if ( width != 0 && current_image != NULL && image_idx == self->image_idx )
  92         {
  93                 if ( width != current_width || height != current_height )
  94                 {
  95                         qimage = ( QImage * )mlt_properties_get_data( producer_props, "_qimage", NULL );
  96                         clear_buffered_image( producer_props, &current_image, &current_alpha );
  97                 }
  98         }
  99         else if ( qimage == NULL && ( current_image == NULL || image_idx != self->image_idx ) )
 100         {
 101                 clear_buffered_image( producer_props, &current_image, &current_alpha );
 102
 103                 self->image_idx = image_idx;
 104                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 105
 106                 if ( !qimage->isNull( ) )
 107                 {
 108                         QImage *frame_copy = new QImage( *qimage );
 109
 110                         // Store the width/height of the pixbuf
 111                         current_width = qimage->width( );
 112                         current_height = qimage->height( );
 113
 114                         // Register qimage for destruction and reuse
 115                         mlt_events_block( producer_props, NULL );
 116                         mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
 117                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
 118                         mlt_properties_set_int( producer_props, "_real_width", current_width );
 119                         mlt_properties_set_int( producer_props, "_real_height", current_height );
 120                         mlt_events_unblock( producer_props, NULL );
 121                 }
 122                 else
 123                 {
 124                         delete qimage;
 125                         qimage = NULL;
 126                 }
 127         }
 128
 129         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 130         if ( qimage && width > 0 && current_image == NULL )
 131         {
 132                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 133                 int interp = 0;
 134
 135                 // QImage has two scaling modes - we'll toggle between them here
 136                 if ( strcmp( interps, "tiles" ) == 0 )
 137                         interp = 1;
 138                 else if ( strcmp( interps, "hyper" ) == 0 )
 139                         interp = 1;
 140
 141                 // Note - the original qimage is already safe and ready for destruction
 142                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
 143                 QImage temp = scaled.convertDepth( 32 );
 144
 145                 // Store width and height
 146                 current_width = width;
 147                 current_height = height;
 148
 149                 // Allocate/define image
 150                 current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
 151
 152                 // Allocate the alpha mask
 153                 current_alpha = ( uint8_t * )mlt_pool_alloc( current_width * current_height );
 154
 155                 // Convert the image
 156                 mlt_convert_bgr24a_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 157
 158                 assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
 159         }
 160
 161         // Set width/height of frame
 162         mlt_properties_set_int( properties, "width", current_width );
 163         mlt_properties_set_int( properties, "height", current_height );
 164         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 165         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 166
 167         // pass the image data without destructor
 168         mlt_properties_set_data( properties, "image", current_image, current_width * ( current_height + 1 ) * 2, NULL, NULL );
 169         mlt_properties_set_data( properties, "alpha", current_alpha, current_width * current_height, NULL, NULL );
 170 }
 171
 172 }
 173