added a special thread for making thumbnails (thumb.h thumb.cpp)

git-svn-id: svn://ttmath.org/publicrep/winix/trunk@700 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/thumb.h

@@ -0,0 +1,90 @@
+/*
+ * This file is a part of Winix
+ * and is not publicly distributed
+ * 
+ * Copyright (c) 2010, Tomasz Sowa
+ * All rights reserved.
+ * 
+ */
+ 
+#ifndef headerfilecmslucorethumb
+#define headerfilecmslucorethumb
+
+#include "basethread.h"
+#include <string>
+#include <list>
+#include "textstream.h"
+#include "db/db.h"
+
+
+
+// Width given, height automagically selected to preserve aspect ratio.
+#define WINIX_THUMB_MODE_1	1
+
+// Height given, width automagically selected to preserve aspect ratio.
+#define WINIX_THUMB_MODE_2	2
+
+// Maximum values of height and width given, aspect ratio preserved.
+#define WINIX_THUMB_MODE_3	3
+
+// Minimum values of width and height given, aspect ratio preserved.
+#define WINIX_THUMB_MODE_4	4
+
+// Width and height emphatically given, original aspect ratio ignored.
+#define WINIX_THUMB_MODE_5	5
+
+// Change as per widthxheight but only if an image dimension exceeds a specified dimension.
+#define WINIX_THUMB_MODE_6	6
+
+// Change dimensions only if both image dimensions are less than specified dimensions.
+#define WINIX_THUMB_MODE_7	7
+
+
+
+
+class Thumb : public BaseThread
+{
+public:
+
+	void CreateThumb(long item_id, const std::wstring & source, const std::wstring & dst,
+					 size_t cx, size_t cy, int aspect_mode = WINIX_THUMB_MODE_2);
+
+	void SetConvertCmd(const std::wstring & cmd);
+	void SetDb(Db * pdb);
+
+private:
+
+	Db * db;
+
+	struct ThumbItem
+	{
+		long item_id;
+		std::wstring source;
+		std::wstring dst;
+		size_t cx;
+		size_t cy;
+		int aspect_mode;
+	};
+
+	// queue of thumbnails to create
+	typedef std::list<ThumbItem> ThumbTab;
+	ThumbTab thumb_tab;
+	ThumbItem item_temp;
+
+	// this is set before the second thread starts
+	std::wstring convert_cmd;
+
+	// only for second thread
+	ThumbItem item_work;
+	std::string tempa;
+	TextStream<std::string> command;
+
+	virtual bool SignalReceived();
+	virtual void Do();
+	void CreateThumbnail();
+	void SelectAspect();
+	void EscapePath(const std::string & path);
+};
+
+
+#endif