Update precompiled pdfium for mac to chromium/3071 and add version info file with minimal build instructions

YACReader/magnifying_glass.h

@@ -0,0 +1,34 @@
+#ifndef __MAGNIFYING_GLASS
+#define __MAGNIFYING_GLASS
+
+#include <QLabel>
+#include <QtGui>
+#include <QMouseEvent>
+#include <QWidget>
+
+	class MagnifyingGlass : public QLabel
+	{
+		Q_OBJECT
+	private:
+		float zoomLevel;
+		void setup(const QSize & size);
+		void keyPressEvent(QKeyEvent * event);
+	public:
+		MagnifyingGlass(int width,int height,QWidget * parent);
+		MagnifyingGlass(const QSize & size, QWidget * parent);
+		void mouseMoveEvent(QMouseEvent * event);
+	public slots:	
+		void updateImage(int x, int y);
+		void updateImage();
+		void wheelEvent(QWheelEvent * event);
+		void zoomIn();
+		void zoomOut();
+		void sizeUp();
+		void sizeDown();
+		void heightUp();
+		void heightDown();
+		void widthUp();
+		void widthDown();
+	};
+
+#endif