Text to speech engine implementation

PdfForQtLib/PdfForQtLib.pro

@@ -225,7 +225,8 @@ qt_libraries.files =    $$[QT_INSTALL_BINS]/Qt?Widgets$${SUFFIX}.dll \
                         $$[QT_INSTALL_BINS]/Qt?Core$${SUFFIX}.dll \
                         $$[QT_INSTALL_BINS]/Qt?WinExtras$${SUFFIX}.dll \
                         $$[QT_INSTALL_BINS]/Qt?Svg$${SUFFIX}.dll \
-                        $$[QT_INSTALL_BINS]/Qt?PrintSupport$${SUFFIX}.dll
+                        $$[QT_INSTALL_BINS]/Qt?PrintSupport$${SUFFIX}.dll \
+                        $$[QT_INSTALL_BINS]/Qt?TextToSpeech$${SUFFIX}.dll
 qt_libraries.path = $$DESTDIR/install
 INSTALLS += qt_libraries
 
@@ -240,3 +241,8 @@ INSTALLS += qt_plugin_iconengine
 qt_plugin_printsupport.files = $$[QT_INSTALL_PLUGINS]/printsupport/windowsprintersupport$${SUFFIX}.dll
 qt_plugin_printsupport.path = $$DESTDIR/install/printsupport
 INSTALLS += qt_plugin_printsupport
+
+qt_plugin_texttospeech.files = $$[QT_INSTALL_PLUGINS]/texttospeech/qtexttospeech_sapi$${SUFFIX}.dll
+qt_plugin_texttospeech.path = $$DESTDIR/install/texttospeech
+INSTALLS += qt_plugin_texttospeech
+

PdfForQtLib/sources/pdftextlayout.h

@@ -272,7 +272,7 @@ using PDFTextFlows = std::vector<PDFTextFlow>;
 
 /// This class represents a portion of continuous text on the page. It can
 /// consists of multiple blocks (which follow reading order).
-class PDFTextFlow
+class PDFFORQTLIBSHARED_EXPORT PDFTextFlow
 {
 public:
 
@@ -294,6 +294,9 @@ public:
     /// \param expression Regular expression to be matched
     PDFFindResults find(const QRegularExpression& expression) const;
 
+    /// Returns whole text for this text flow
+    QString getText() const { return m_text; }
+
     /// Returns text form character pointers
     /// \param begin Begin character
     /// \param end End character
@@ -327,7 +330,7 @@ private:
 
 /// Text layout of single page. Can handle various fonts, various angles of lines
 /// and vertically oriented text. It performs the "docstrum" algorithm.
-class PDFTextLayout
+class PDFFORQTLIBSHARED_EXPORT PDFTextLayout
 {
 public:
     explicit PDFTextLayout();
@@ -498,4 +501,6 @@ private:
 
 }   // namespace pdf
 
+Q_DECLARE_OPERATORS_FOR_FLAGS(pdf::PDFTextFlow::FlowFlags)
+
 #endif // PDFTEXTLAYOUT_H

PdfForQtLib/sources/pdfutils.h

@@ -445,6 +445,32 @@ inline QColor invertColor(QColor color)
     return QColor::fromRgbF(r, g, b, a);
 }
 
+/// Performs linear interpolation of interval [x1, x2] to interval [y1, y2],
+/// using formula y = y1 + (x - x1) * (y2 - y1) / (x2 - x1), transformed
+/// to formula y = k * x + q, where q = y1 - x1 * k and
+/// k = (y2 - y1) / (x2 - x1).
+template<typename T>
+class PDFLinearInterpolation
+{
+public:
+    constexpr inline PDFLinearInterpolation(T x1, T x2, T y1, T y2) :
+        m_k((y2 - y1) / (x2 - x1)),
+        m_q(y1 - x1 * m_k)
+    {
+
+    }
+
+    /// Maps value from x interval to y interval
+    constexpr inline T operator()(T x) const
+    {
+        return m_k * x + m_q;
+    }
+
+private:
+    T m_k;
+    T m_q;
+};
+
 }   // namespace pdf
 
 #endif // PDFUTILS_H