From a22f68069b40ab711cfab4acf3aae109e402f2c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hans-Ulrich=20J=C3=BCttner?= <huj@froreich-bioscientia.de>
Date: Wed, 2 Aug 2017 13:48:21 +0200
Subject: [PATCH] Added methods to get and set the font size of text fields

Fixes bug #101692
---
 poppler/Form.cc         | 81 +++++++++++++++++++++++++++++++++++++++++++++++++
 poppler/Form.h          | 13 ++++++++
 qt5/src/poppler-form.cc | 12 +++++++-
 qt5/src/poppler-form.h  | 10 ++++++
 4 files changed, 115 insertions(+), 1 deletion(-)

diff --git a/poppler/Form.cc b/poppler/Form.cc
index aaf9684..6a6f26c 100644
--- a/poppler/Form.cc
+++ b/poppler/Form.cc
@@ -29,6 +29,8 @@
 
 #include <set>
 #include <stddef.h>
+#include <stdlib.h>
+#include <ctype.h>
 #include <string.h>
 #include "goo/gmem.h"
 #include "goo/GooString.h"
@@ -311,6 +313,16 @@ int FormWidgetText::getMaxLen () const
   return parent()->getMaxLen ();
 }
 
+double FormWidgetText::getTextFontSize()
+{
+  return parent()->getTextFontSize();
+}
+
+void FormWidgetText::setTextFontSize(int fontSize)
+{
+  parent()->setTextFontSize(fontSize);
+}
+
 void FormWidgetText::setContent(GooString* new_content)
 {
   parent()->setContentCopy(new_content);
@@ -1045,6 +1057,75 @@ FormFieldText::~FormFieldText()
   delete content;
 }
 
+double FormFieldText::getTextFontSize()
+{
+  GooList* daToks = new GooList();
+  int idx = parseDA(daToks);
+  double fontSize = 0;
+  if (idx >= 0) {
+    char* p = nullptr;
+    fontSize = strtod(static_cast<GooString*>(daToks->get(idx))->getCString(), &p);
+    if (!p || *p)
+      fontSize = 0;
+  }
+  deleteGooList(daToks, GooString);
+  return fontSize;
+}
+
+void FormFieldText::setTextFontSize(int fontSize)
+{
+  if (fontSize > 0 && obj.isDict()) {
+    GooList* daToks = new GooList();
+    int idx = parseDA(daToks);
+    if (defaultAppearance)
+      delete defaultAppearance;
+    defaultAppearance = new GooString;
+    for (int i = 0; i < daToks->getLength(); ++i) {
+      if (i > 0)
+        defaultAppearance->append(' ');
+      if (i == idx) {
+        defaultAppearance->appendf("{0:d}", fontSize);
+      } else {
+        defaultAppearance->append(static_cast<GooString*>(daToks->get(i)));
+      }
+    }
+    deleteGooList(daToks, GooString);
+    obj.dictSet("DA", Object(defaultAppearance->copy()));
+    xref->setModifiedObject(&obj, ref);
+    updateChildrenAppearance();
+  }
+}
+
+int FormFieldText::parseDA(GooList* daToks)
+{
+  int idx = -1;
+  if (obj.isDict()) {
+    Object objDA(obj.dictLookup("DA"));
+    if (objDA.isString()) {
+      GooString* da = objDA.getString();
+      if (da) {
+        int i = 0;
+        int j = 0;
+        while (i < da->getLength()) {
+          while (i < da->getLength() && isspace(da->getChar(i))) {
+            ++i;
+          }
+          if (i < da->getLength()) {
+            for (j = i + 1; j < da->getLength() && !isspace(da->getChar(j)); ++j) {
+            }
+            GooString* tok = new GooString(da, i, j - i);
+            if (!tok->cmp("Tf"))
+              idx = daToks->getLength() - 1;
+            daToks->append(tok);
+            i = j;
+          }
+        }
+      }
+    }
+  }
+  return idx;
+}
+
 
 //------------------------------------------------------------------------
 // FormFieldChoice
diff --git a/poppler/Form.h b/poppler/Form.h
index d73ab89..32b35cf 100644
--- a/poppler/Form.h
+++ b/poppler/Form.h
@@ -23,6 +23,7 @@
 #pragma interface
 #endif
 
+#include "goo/GooList.h"
 #include "Object.h"
 #include "Annot.h"
 
@@ -197,6 +198,11 @@ public:
   bool isComb () const; 
   bool isRichText () const;
   int getMaxLen () const;
+  //return the font size of the field's text
+  double getTextFontSize();
+  //set the font size of the field's text (currently only integer values)
+  void setTextFontSize(int fontSize);
+
 protected:
   FormFieldText *parent() const;
 };
@@ -401,10 +407,17 @@ public:
 
   int getMaxLen () const { return maxLen; }
 
+  //return the font size of the field's text
+  double getTextFontSize();
+  //set the font size of the field's text (currently only integer values)
+  void setTextFontSize(int fontSize);
+
 #ifdef DEBUG_FORMS
   void print(int indent = 0);
 #endif
 protected:
+  int parseDA(GooList* daToks);
+
   GooString* content;
   bool multiline;
   bool password;
diff --git a/qt5/src/poppler-form.cc b/qt5/src/poppler-form.cc
index 6cbceb0..dbec85e 100644
--- a/qt5/src/poppler-form.cc
+++ b/qt5/src/poppler-form.cc
@@ -180,7 +180,6 @@ Link *FormField::additionalAction(AdditionalActionType type) const
   return action;
 }
 
-
 FormFieldButton::FormFieldButton(DocumentData *doc, ::Page *p, ::FormWidgetButton *w)
   : FormField(*new FormFieldData(doc, p, w))
 {
@@ -342,6 +341,17 @@ bool FormFieldText::canBeSpellChecked() const
   return !fwt->noSpellCheck();
 }
 
+double FormFieldText::getFontSize() const
+{
+  FormWidgetText* fwt = static_cast<FormWidgetText*>(m_formData->fm);
+  return fwt->getTextFontSize();
+}
+
+void FormFieldText::setFontSize(int fontSize)
+{
+  FormWidgetText* fwt = static_cast<FormWidgetText*>(m_formData->fm);
+  fwt->setTextFontSize(fontSize);
+}
 
 FormFieldChoice::FormFieldChoice(DocumentData *doc, ::Page *p, ::FormWidgetChoice *w)
   : FormField(*new FormFieldData(doc, p, w))
diff --git a/qt5/src/poppler-form.h b/qt5/src/poppler-form.h
index 44928b3..cd4692b 100644
--- a/qt5/src/poppler-form.h
+++ b/qt5/src/poppler-form.h
@@ -272,6 +272,16 @@ namespace Poppler {
 	 */
 	bool canBeSpellChecked() const;
 
+	/**
+	  The font size of the text in the form field
+	 */
+	double getFontSize() const;
+
+	/**
+	  Set the font size of the text in the form field (currently only as integer)
+	 */
+	void setFontSize(int fontSize);
+
     private:
 	Q_DISABLE_COPY(FormFieldText)
     };
-- 
1.9.1