Make texts search-able in PDF files (using invisible texts behind stroked texts)

common/common_plotPDF_functions.cpp

@@ -775,18 +775,22 @@ void PDF_PLOTTER::Text( const wxPoint&              aPos,
         aMultilineAllowed = false;  // the text has only one line.
 
     // Emit native PDF text (if requested)
-    // Currently: does not work: disable it
-    bool use_native = false; // = m_textMode != PLOTTEXTMODE_STROKE && !aMultilineAllowed;
+    // Currently: is not supported, because only our stroke font is alloxed: disable it
+    // However, shadowed texts (searchable texts) works reasonably well because
+    // pixel accurate precision is not requested, so we add searchable texts
+    // behind our stroked font texts
+    bool use_native_font = false;
+    // render_mode 0 shows the text, render_mode 3 is invisible
+    int render_mode = use_native_font ? 0 : 3;
 
-    if( use_native )
-    {
     const char *fontname = aItalic ? (aBold ? "/KicadFontBI" : "/KicadFontI")
         : (aBold ? "/KicadFontB" : "/KicadFont");
 
-        // Compute the copious tranformation parameters
+    // Compute the copious tranformation parameters of the Curent Transform Matrix
     double ctm_a, ctm_b, ctm_c, ctm_d, ctm_e, ctm_f;
     double wideningFactor, heightFactor;
-        computeTextParameters( aPos, aText, aOrient, aSize, aH_justify,
+
+    computeTextParameters( aPos, aText, aOrient, aSize, m_plotMirror, aH_justify,
             aV_justify, aWidth, aItalic, aBold,
             &wideningFactor, &ctm_a, &ctm_b, &ctm_c,
             &ctm_d, &ctm_e, &ctm_f, &heightFactor );
@@ -798,20 +802,18 @@ void PDF_PLOTTER::Text( const wxPoint&              aPos,
        coordinate system will be used for the overlining. Also the %f
        for the trig part of the matrix to avoid %g going in exponential
        format (which is not supported)
-           Rendermode 0 shows the text, rendermode 3 is invisible */
+       render_mode 0 shows the text, render_mode 3 is invisible */
     fprintf( workFile, "q %f %f %f %f %g %g cm BT %s %g Tf %d Tr %g Tz ",
             ctm_a, ctm_b, ctm_c, ctm_d, ctm_e, ctm_f,
-                fontname, heightFactor,
-                (m_textMode == PLOTTEXTMODE_NATIVE) ? 0 : 3,
+            fontname, heightFactor, render_mode,
             wideningFactor * 100 );
 
     // The text must be escaped correctly
     fputsPostscriptString( workFile, aText );
     fputs( " Tj ET\n", workFile );
 
-        /* We are still in text coordinates, plot the overbars (if we're
-         * not doing phantom text) */
-        if( m_textMode == PLOTTEXTMODE_NATIVE )
+    // We are in text coordinates, plot the overbars, if we're not doing phantom text
+    if( use_native_font )
     {
         std::vector<int> pos_pairs;
         postscriptOverlinePositions( aText, aSize.x, aItalic, aBold, &pos_pairs );
@@ -831,10 +833,9 @@ void PDF_PLOTTER::Text( const wxPoint&              aPos,
 
     // Stroke and restore the CTM
     fputs( "S Q\n", workFile );
-    }
 
     // Plot the stroked text (if requested)
-    if( !use_native )
+    if( !use_native_font )
     {
         PLOTTER::Text( aPos, aColor, aText, aOrient, aSize, aH_justify, aV_justify,
                 aWidth, aItalic, aBold, aMultilineAllowed );

common/common_plotPS_functions.cpp

@@ -427,6 +427,7 @@ void PSLIKE_PLOTTER::computeTextParameters( const wxPoint&           aPos,
                                             const wxString&          aText,
                                             int                      aOrient,
                                             const wxSize&            aSize,
+                                            bool                     aMirror,
                                             enum EDA_TEXT_HJUSTIFY_T aH_justify,
                                             enum EDA_TEXT_VJUSTIFY_T aV_justify,
                                             int                      aWidth,
@@ -487,7 +488,14 @@ void PSLIKE_PLOTTER::computeTextParameters( const wxPoint&           aPos,
     DPOINT sz_dev = userToDeviceSize( aSize );
 
     // Now returns the final values... the widening factor
-    *wideningFactor = sz_dev.y / sz_dev.x;
+    *wideningFactor = sz_dev.x / sz_dev.y;
+
+    // Mirrored texts must be plotted as mirrored!
+    if( m_plotMirror )
+    {
+        *wideningFactor = -*wideningFactor;
+        aOrient = -aOrient;
+    }
 
     // The CTM transformation matrix
     double alpha = DECIDEG2RAD( aOrient );
@@ -953,7 +961,7 @@ void PS_PLOTTER::Text( const wxPoint&       aPos,
         // Compute the copious tranformation parameters
         double ctm_a, ctm_b, ctm_c, ctm_d, ctm_e, ctm_f;
         double wideningFactor, heightFactor;
-        computeTextParameters( aPos, aText, aOrient, aSize, aH_justify,
+        computeTextParameters( aPos, aText, aOrient, aSize, m_plotMirror, aH_justify,
                 aV_justify, aWidth, aItalic, aBold,
                 &wideningFactor, &ctm_a, &ctm_b, &ctm_c,
                 &ctm_d, &ctm_e, &ctm_f, &heightFactor );

include/plot_common.h

@@ -692,6 +692,7 @@ protected:
                                 const wxString&          aText,
                                 int                      aOrient,
                                 const wxSize&            aSize,
+                                bool                     aMirror,
                                 enum EDA_TEXT_HJUSTIFY_T aH_justify,
                                 enum EDA_TEXT_VJUSTIFY_T aV_justify,
                                 int                      aWidth,