integrate negative whtiespace; restructru prepare_line

lib/all.css

@@ -22,7 +22,6 @@
   white-space:pre;
 }
 .l > ._ {
-  display:inline-block;
   color:transparent;
 }
 ::selection{

src/HTMLRenderer.h

@@ -161,9 +161,14 @@ class HTMLRenderer : public OutputDev
         ////////////////////////////////////////////////////
         // state tracking 
         ////////////////////////////////////////////////////
+        // check updated states, and determine new_line_stauts
+        // make sure this function can be called several times consecutively without problem
         void check_state_change(GfxState * state);
-        void reset_state_track();
-        void prepare_line(); // close current span or div if necessary, according to new_line_status
+        // reset all ***_changed flags
+        void reset_state_change();
+        // prepare the line context, (close old tags, open new tags)
+        // make sure the current HTML style consistent with PDF
+        void prepare_line(GfxState * state);
         void close_line();
 
 

src/HTMLRenderer/export.cc

@@ -148,6 +148,9 @@ void HTMLRenderer::export_color (long long color_id, const GfxRGB * rgb)
 
 void HTMLRenderer::export_whitespace (long long ws_id, double ws_width)
 {
-    allcss_fout << format("._%|1$x|{width:%2%px;}") % ws_id % ws_width << endl;
+    if(ws_width > 0)
+        allcss_fout << format("._%|1$x|{display:inline-block;width:%2%px;}") % ws_id % ws_width << endl;
+    else
+        allcss_fout << format("._%|1$x|{display:inline;margin-left:%2%px;}") % ws_id % ws_width << endl;
 }
 

src/HTMLRenderer/general.cc

@@ -182,7 +182,7 @@ void HTMLRenderer::startPage(int pageNum, GfxState *state)
     draw_scale = 1.0;
     draw_tx = draw_ty = 0;
 
-    reset_state_track();
+    reset_state_change();
 }
 
 void HTMLRenderer::endPage() {

src/HTMLRenderer/image.cc

@@ -55,7 +55,8 @@ void HTMLRenderer::drawImage(GfxState * state, Object * ref, Stream * str, int w
 
     close_line();
 
-    double * ctm = state->getCTM();
+    double ctm[6];
+    memcpy(ctm, state->getCTM(), sizeof(ctm));
     ctm[4] = ctm[5] = 0.0;
     html_fout << format("<img class=\"i t%2%\" style=\"left:%3%px;bottom:%4%px;width:%5%px;height:%6%px;\" src=\"i%|1$x|.png\" />") % image_count % install_transform_matrix(ctm) % state->getCurX() % state->getCurY() % width % height << endl;
 

src/HTMLRenderer/state.cc

@@ -89,7 +89,7 @@ void HTMLRenderer::check_state_change(GfxState * state)
     }
 
     // text position
-    // we've been tracking the text position positively in update... function
+    // we've been tracking the text position positively in the update*** functions
     if(all_changed || text_pos_changed)
     {
         need_recheck_position = true;
@@ -224,9 +224,48 @@ void HTMLRenderer::check_state_change(GfxState * state)
         }
     }
 
-    prepare_line();
+    reset_state_change();
+}
 
-    // TODO: move the following to prepare_line ??
+void HTMLRenderer::reset_state_change()
+{
+    all_changed = false;
+
+    rise_changed = false;
+    text_pos_changed = false;
+
+    font_changed = false;
+    ctm_changed = false;
+    text_mat_changed = false;
+    hori_scale_changed = false;
+
+    letter_space_changed = false;
+    word_space_changed = false;
+
+    color_changed = false;
+}
+void HTMLRenderer::prepare_line(GfxState * state)
+{
+    // close old tags when necessary
+    if((line_status == LineStatus::NONE) || (new_line_status == LineStatus::NONE))
+    {
+        //pass
+    }
+    else if(new_line_status == LineStatus::DIV)
+    {
+        close_line();
+    }
+    else
+    {
+        assert(new_line_status == LineStatus::SPAN);
+        if(line_status == LineStatus::SPAN)
+            html_fout << "</span>";
+        else
+            assert(line_status == LineStatus::DIV);
+        // don't change line_status
+    }
+
+    // open new tags when necessary
     if(line_status == LineStatus::NONE)
     {
         new_line_status = LineStatus::DIV;
@@ -250,20 +289,10 @@ void HTMLRenderer::check_state_change(GfxState * state)
         {
             // don't close a pending span here, keep the styling
 
-            if(target > param->h_eps)
-            {
-                double w;
-                auto wid = install_whitespace(target, w);
-                html_fout << format("<span class=\"_ _%|1$x|\"> </span>") % wid;
-                draw_tx += w / draw_scale;
-            }
-            else
-            {
-                // shift left
-                // TODO, create a class for this
-                html_fout << format("<span style=\"margin-left:%1%px\"></span>") % target;
-                draw_tx += target / draw_scale;
-            }
+            double w;
+            auto wid = install_whitespace(target, w);
+            html_fout << format("<span class=\"_ _%|1$x|\">%2%</span>") % wid % (target > 0 ? " " : "");
+            draw_tx += w / draw_scale;
         }
     }
 
@@ -311,48 +340,12 @@ void HTMLRenderer::check_state_change(GfxState * state)
         line_status = new_line_status;
     }
 
-    reset_state_track();
-
-}
-
-void HTMLRenderer::reset_state_track()
-{
-    all_changed = false;
-
-    rise_changed = false;
-    text_pos_changed = false;
-
-    font_changed = false;
-    ctm_changed = false;
-    text_mat_changed = false;
-    hori_scale_changed = false;
-
-    letter_space_changed = false;
-    word_space_changed = false;
-
-    color_changed = false;
-}
-void HTMLRenderer::prepare_line()
-{
-    if((line_status == LineStatus::NONE) || (new_line_status == LineStatus::NONE))
-        return;
-
-    if(new_line_status == LineStatus::DIV)
-    {
-        close_line();
-    }
-    else
-    {
-        assert(new_line_status == LineStatus::SPAN);
-        if(line_status == LineStatus::SPAN)
-            html_fout << "</span>";
-        else
-            assert(line_status == LineStatus::DIV);
-        // don't change line_status
-    }
 }
 void HTMLRenderer::close_line()
 {
+    if(line_status == LineStatus::NONE)
+        return;
+
     if(line_status == LineStatus::SPAN)
         html_fout << "</span>";
     else

src/HTMLRenderer/text.cc

@@ -155,6 +155,7 @@ void HTMLRenderer::drawString(GfxState * state, GooString * s)
 
     // see if the line has to be closed due to state change
     check_state_change(state);
+    prepare_line(state);
 
     // Now ready to output
     // get the unicodes