/*
 * producer_pixbuf.c -- raster image loader based upon gdk-pixbuf
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Dan Dennedy <dan@dennedy.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "producer_pixbuf.h"
#include <framework/mlt_frame.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
static void producer_close( mlt_producer parent );

mlt_producer producer_pixbuf_init( const char *filename )
{
	producer_pixbuf this = calloc( sizeof( struct producer_pixbuf_s ), 1 );
	if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
	{
		mlt_producer producer = &this->parent;

		producer->get_frame = producer_get_frame;
		producer->close = producer_close;

		this->filename = strdup( filename );
		this->counter = -1;
		g_type_init();

		return producer;
	}
	free( this );
	return NULL;
}

static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
{
	// Obtain properties of frame
	mlt_properties properties = mlt_frame_properties( this );

	// May need to know the size of the image to clone it
	int size = 0;

	// Get the image
	uint8_t *image = mlt_properties_get_data( properties, "image", &size );

	// Get width and height
	*width = mlt_properties_get_int( properties, "width" );
	*height = mlt_properties_get_int( properties, "height" );

	// Clone if necessary
	if ( writable )
	{
		// Clone our image
		uint8_t *copy = malloc( size );
		memcpy( copy, image, size );

		// We're going to pass the copy on
		image = copy;

		// Now update properties so we free the copy after
		mlt_properties_set_data( properties, "image", copy, size, free, NULL );
	}

	// Pass on the image
	*buffer = image;

	return 0;
}

uint8_t *producer_get_alpha_mask( mlt_frame this )
{
	// Obtain properties of frame
	mlt_properties properties = mlt_frame_properties( this );

	// Return the alpha mask
	return mlt_properties_get_data( properties, "alpha", NULL );
}

static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
	producer_pixbuf this = producer->child;
	GdkPixbuf *pixbuf = NULL;
	GError *error = NULL;

	// Generate a frame
	*frame = mlt_frame_init( );

	// Obtain properties of frame
	mlt_properties properties = mlt_frame_properties( *frame );

    // optimization for subsequent iterations on single picture
	if ( this->image != NULL )
	{
		// Set width/height
		mlt_properties_set_int( properties, "width", this->width );
		mlt_properties_set_int( properties, "height", this->height );

		// if picture sequence pass the image and alpha data without destructor
		mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
		mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );

		// Set alpha mask call back
        ( *frame )->get_alpha_mask = producer_get_alpha_mask;

		// Stack the get image callback
		mlt_frame_push_get_image( *frame, producer_get_image );

	}
	else if ( strchr( this->filename, '%' ) != NULL )
	{
		// handle picture sequences
		char filename[1024];
		filename[1023] = 0;
		int current = this->counter;
		do
		{
			++this->counter;
			snprintf( filename, 1023, this->filename, this->counter );
			pixbuf = gdk_pixbuf_new_from_file( filename, &error );
			// allow discontinuity in frame numbers up to 99
			error = NULL;
		} while ( pixbuf == NULL && ( this->counter - current ) < 100 );
	}
	else
	{
		pixbuf = gdk_pixbuf_new_from_file( this->filename, &error );
	}

	// If we have a pixbuf
	if ( pixbuf )
	{
		// Store width and height
		this->width = gdk_pixbuf_get_width( pixbuf );
		this->height = gdk_pixbuf_get_height( pixbuf );

		// Allocate/define image and alpha
		uint8_t *image = malloc( this->width * this->height * 2 );
		uint8_t *alpha = NULL;

		// Extract YUV422 and alpha
		if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
		{
			// Allocate the alpha mask
			alpha = malloc( this->width * this->height );

			// Convert the image
			mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
										  this->width, this->height,
										  gdk_pixbuf_get_rowstride( pixbuf ),
										  image, alpha );
		}
		else
		{ 
			// No alpha to extract
			mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
										 this->width, this->height,
										 gdk_pixbuf_get_rowstride( pixbuf ),
										 image );
		}

		// Finished with pixbuf now
		g_object_unref( pixbuf );

		// Set width/height of frame
		mlt_properties_set_int( properties, "width", this->width );
		mlt_properties_set_int( properties, "height", this->height );

		// Pass alpha and image on properties with or without destructor
		if ( this->counter >= 0 )
		{
			// if picture sequence pass the image and alpha data with destructor
			mlt_properties_set_data( properties, "image", image, 0, free, NULL );
			mlt_properties_set_data( properties, "alpha", alpha, 0, free, NULL );
		}
		else
		{
			// if single picture, reference the image and alpha in the producer
			this->image = image;
			this->alpha = alpha;

			// pass the image and alpha data without destructor
			mlt_properties_set_data( properties, "image", image, 0, NULL, NULL );
			mlt_properties_set_data( properties, "alpha", alpha, 0, NULL, NULL );
		}

		// Set alpha call back
		( *frame )->get_alpha_mask = producer_get_alpha_mask;

		// Push the get_image method
		mlt_frame_push_get_image( *frame, producer_get_image );
	}

	// Update timecode on the frame we're creating
	mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );

	// Calculate the next timecode
	mlt_producer_prepare_next( producer );

	return 0;
}

static void producer_close( mlt_producer parent )
{
	producer_pixbuf this = parent->child;
	if ( this->filename )
		free( this->filename );
	if ( this->image )
		free( this->image );
	if ( this->alpha )
		free( this->alpha );
	parent->close = NULL;
	mlt_producer_close( parent );
	free( this );
}