new option for fixing glyph width

pdf2htmlEX.1.in

@@ -35,7 +35,7 @@ Specify owner password
 .B -u, --user-password <password>
 Specify user password
 .TP
-.B --dest-dir <dir> (Default: ".")
+.B --dest-dir <dir> (Default: .)
 Specify destination folder
 .TP
 .B --data-dir <dir> (Default: @CMAKE_INSTALL_PREFIX@/share/pdf2htmlEX)
@@ -117,15 +117,21 @@ Treat space characters as offsets, which may increase the size of the output.
 
 Turn it on if space characters are not displayed correctly, or you want to remove positional spaces.
 .TP
-.B --css-filename <filename> (Default: "")
+.B --stretch-narrow-glyph <0|1> (Default: 0)
+If set to 1, glyphs narrower than described in PDF will be strecth; otherwise space will be padded to the right of the glyphs
+.TP
+.B --squeeze_wide_glyph <0|1> (Default: 0)
+If set to 1, glyphs wider than described in PDF will be squeezed; otherwise it will be truncated.
+.TP
+.B --css-filename <filename> (Default: <none>)
 Specify the filename of the generated css file, if not embedded.
 
 If it's empty, the file name will be determined automatically.
 .TP
-.B --font-suffix <suffix> (Default: ".ttf"), --font-format <format> (Default: "truetype")
+.B --font-suffix <suffix> (Default: .ttf), --font-format <format> (Default: truetype)
 Specify the suffix and format of fonts extracted from the PDF file. They should be consistent.
 .TP
-.B --external-hint-tool <tool> (Default: "")
+.B --external-hint-tool <tool> (Default: <none>)
 If specified, the tool will be called in order to enhanced hinting for fonts, this will precede --auto-hint.
 
 The tool will be called as '<tool> <in.suffix> <out.suffix>', where suffix will be the same as specified for --font-suffix.
@@ -141,10 +147,10 @@ If switched off, intermediate files won't be cleaned in the end.
 .B pdf2htmlEX /path/to/file.pdf
 Convert file.pdf into file.html
 .TP
-.B pdf2htmlEX --tmp-dir tmp --clean-tmp 0 --debug 1 /path/to/file.pdf
+.B pdf2htmlEX --clean-tmp 0 --debug 1 /path/to/file.pdf
 Convert file.pdf and leave all intermediate files.
 .TP
-.B pdf2htmlEX --dest-dir out --single-html 0 --debug 1 /path/to/file.pdf
+.B pdf2htmlEX --dest-dir out --single-html 0 /path/to/file.pdf
 Convert file.pdf into out/file.html and leave font/image files separated.
 
 .SH COPYRIGHT

src/HTMLRenderer/text.cc

@@ -398,7 +398,7 @@ void HTMLRenderer::embed_font(const string & filepath, GfxFont * font, FontInfo
             }
         }
 
-        ffw_set_widths(width_list, max_key + 1);
+        ffw_set_widths(width_list, max_key + 1, param->stretch_narrow_glyph, param->squeeze_wide_glyph);
         ffw_reencode_raw(cur_mapping, max_key + 1, 1);
 
         if(ctu)

src/ffw.c

@@ -19,6 +19,8 @@
 
 #include "ffw.h"
 
+static real EPS=1e-6;
+
 static inline int min(int a, int b)
 {
     return (a<b)?a:b;
@@ -294,16 +296,16 @@ void ffw_metric(double * ascent, double * descent)
 /*
  * TODO:bitmap, reference have not been considered in this function
  */
-void ffw_set_widths(int * width_list, int mapping_len)
+void ffw_set_widths(int * width_list, int mapping_len, int stretch_narrow, int squeeze_wide)
 {
+    /*
+     * Disabled, because it causes crashing
+     
     memset(cur_fv->selected, 1, cur_fv->map->enccount);
     // remove kern
     FVRemoveKerns(cur_fv);
     FVRemoveVKerns(cur_fv);
-    // remove bearing
+    */
-    // TODO: optimize this, merge the transform matrix with width setting  (below)
-    //FVSetWidthScript(cur_fv, wt_lbearing, 0, 0);
-    //FVSetWidthScript(cur_fv, wt_rbearing, 0, 0);
 
     SplineFont * sf = cur_fv->sf;
 
@@ -333,12 +335,12 @@ void ffw_set_widths(int * width_list, int mapping_len)
         DBounds bb;
         SplineCharFindBounds(sc, &bb);
 
-        // TODO: add an option
         double glyph_width = bb.maxx - bb.minx;
-        if(glyph_width > width_list[i])
+        if((glyph_width > EPS)
+                && (((glyph_width > width_list[i] + EPS) && (squeeze_wide))
+                    || ((glyph_width < width_list[i] - EPS) && (stretch_narrow)))) 
         {
-            real transform[6];
+            real transform[6]; transform[0] = ((double)width_list[i]) / glyph_width;
-            transform[0] = ((double)width_list[i]) / glyph_width;
             transform[3] = 1.0;
             transform[1] = transform[2] = transform[4] = transform[5] = 0;
             FVTrans(cur_fv, sc, transform, NULL, fvt_alllayers | fvt_dontmovewidth);

src/include/Param.h

@@ -40,9 +40,13 @@ struct Param
     double h_eps, v_eps;
     double space_threshold;
     double font_size_multiplier;
+
     int auto_hint;
     int tounicode;
     int space_as_offset;
+    
+    int stretch_narrow_glyph;
+    int squeeze_wide_glyph;
 
     std::string css_filename;
     std::string font_suffix, font_format;

src/include/ffw.h

@@ -34,7 +34,7 @@ int ffw_get_em_size(void);
 // fix metrics and get them
 void ffw_metric(double * ascent, double * descent);
 
-void ffw_set_widths(int * width_list, int mapping_len);
+void ffw_set_widths(int * width_list, int mapping_len, int stretch_narrow, int squeeze_wide);
 
 void ffw_auto_hint(void);
 

src/pdf2htmlEX.cc

@@ -41,6 +41,8 @@ void show_usage_and_exit(const char * dummy = nullptr)
     cerr << "Options:" << endl;
     argparser.show_usage(cerr);
     cerr << endl;
+    cerr << "Run 'man pdf2htmlEX' for detailed information" << endl;
+    cerr << endl;
     exit(EXIT_FAILURE);
 }
 
@@ -79,6 +81,8 @@ void parse_options (int argc, char **argv)
         .add("auto-hint", &param.auto_hint, 0, "Whether to generate hints for fonts")
         .add("tounicode", &param.tounicode, 0, "Specify how to deal with ToUnicode map, 0 for auto, 1 for forced, -1 for disabled")
         .add("space-as-offset", &param.space_as_offset, 0, "treat space characters as offsets")
+        .add("stretch_narrow_glyph", &param.stretch_narrow_glyph, 0, "stretch narrow glyphs instead of padding space")
+        .add("squeeze_wide_glyph", &param.squeeze_wide_glyph, 0, "squeeze wide glyphs instead of truncating")
 
         .add("css-filename", &param.css_filename, "", "Specify the file name of the generated css file")
         .add("font-suffix", &param.font_suffix, ".ttf", "suffix for extracted font files")