winix/core/thumb.cpp

/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "thumb.h"
#include "utf8.h"
#include "log.h"



void Thumb::SetConvertCmd(const std::wstring & cmd)
{
	convert_cmd = cmd;
}


void Thumb::SetDb(Db * pdb)
{
	db = pdb;
}


// first thread (objects locked)
void Thumb::CreateThumb(long item_id, const std::wstring & source, const std::wstring & dst, size_t cx, size_t cy, int aspect_mode)
{
	item_temp.item_id     = item_id;
	item_temp.source      = source;
	item_temp.dst         = dst;
	item_temp.cx          = cx;
	item_temp.cy          = cy;
	item_temp.aspect_mode = aspect_mode;

	thumb_tab.insert(thumb_tab.end(), item_temp);
	WakeUpThread();
}



// second thread (objects locked)
bool Thumb::SignalReceived()
{
	return !thumb_tab.empty();
}



// second thread (objects not locked)
void Thumb::Do()
{
ThumbTab::iterator i;
bool end;

	Lock();
	i = thumb_tab.begin();
	Unlock();

	do
	{
		Lock();
		
		if( i != thumb_tab.end() )
		{
			item_work = *i;
			thumb_tab.erase(i++);
			end = false;
		}
		else
		{
			end = true;
		}

		Unlock();

		if( !end )
			CreateThumbnail();

	}
	while( !end );
}







void Thumb::EscapePath(const std::string & path)
{
	command << '"';

	for(size_t i=0 ; i<path.size() ; ++i)
	{
		if( path[i] == '"' )
			command << '\\';

		command << path[i];
	}

	command << "\" ";
}



/*
from: http://www.imagemagick.org/script/command-line-processing.php#geometry

scale% 				Height and width both scaled by specified percentage.
scale-x%xscale-y% 	Height and width individually scaled by specified percentages. (Only one % symbol needed.)
width 				Width given, height automagically selected to preserve aspect ratio.
xheight 			Height given, width automagically selected to preserve aspect ratio.
widthxheight 		Maximum values of height and width given, aspect ratio preserved.
widthxheight^ 		Minimum values of width and height given, aspect ratio preserved.
widthxheight! 		Width and height emphatically given, original aspect ratio ignored.
widthxheight> 		Change as per widthxheight but only if an image dimension exceeds a specified dimension.
widthxheight< 		Change dimensions only if both image dimensions exceed specified dimensions.
*/
void Thumb::SelectAspect()
{
	switch( item_work.aspect_mode )
	{
	case WINIX_THUMB_MODE_1:
		command << item_work.cx;
		break;

	case WINIX_THUMB_MODE_3:
		command << item_work.cx << "x" << item_work.cy;
		break;

	case WINIX_THUMB_MODE_4:
		command << '"' << item_work.cx << "x" << item_work.cy << "^\"";
		break;

	case WINIX_THUMB_MODE_5:
		command << '"' << item_work.cx << "x" << item_work.cy << "!\"";
		break;

	case WINIX_THUMB_MODE_6:
		command << '"' << item_work.cx << "x" << item_work.cy << ">\"";
		break;

	case WINIX_THUMB_MODE_7:
		command << '"' << item_work.cx << "x" << item_work.cy << "<\"";
		break;

	case WINIX_THUMB_MODE_2:
	default:
		command << "x" << item_work.cy;
		break;
	}
}


// second thread (objects are not locked)
void Thumb::CreateThumbnail()
{
	command.Clear();

	Ezc::WideToUTF8(convert_cmd, tempa);
	command << tempa << " -quiet -strip -thumbnail ";
	SelectAspect();
	command << " ";

	Ezc::WideToUTF8(item_work.source, tempa);
	EscapePath(tempa);

	Ezc::WideToUTF8(item_work.dst, tempa);
	EscapePath(tempa);

	if( system(command.CStr()) == 0 )
	{
		Lock();
		log << log3 << "Thumb: created a thumbnail: " << tempa << logend;
		db->EditHasThumbById(true, item_work.item_id);
		Unlock();
	}
	else
	{
		Lock();
		log << log3 << "Thumb: some problems with creating a thumbnail: " << tempa << logend;
		Unlock();
	}
}



// second thread (objects are not locked)
// !! there is a problem with GIF files
// Bus error (core dumped)
/*
#include "wand/MagickWand.h"

	// compiler options:
	// include: -I/usr/local/include/ImageMagick
	// link with: `MagickWand-config --ldflags --libs`

void Thumb::CreateThumbnail()
{
	Ezc::WideToUTF8(item_work.source, sourcea);
	Ezc::WideToUTF8(item_work.dst,    dsta);

	MagickWandGenesis();

	MagickWand * wand = NewMagickWand();

	if( MagickReadImage(wand, sourcea.c_str()) )
	{
		MagickThumbnailImage(wand, item_work.cx, item_work.cy);

		if( MagickWriteImage(wand, dsta.c_str()) )
		{
			Lock();
			log << log3 << "Thumb: created a thumbnail: " << dsta << logend;
			Unlock();
		}
	}

	DestroyMagickWand(wand);

	MagickWandTerminus();
}
*/