Generate default AP stream for squiggly annotation.

core/fpdfdoc/cpvt_generateap.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfdoc/cpvt_generateap.h"
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
@@ skipping 601 matching lines @@
   sAppStream << fLineWidth << " w " << rect.left << " "
              << rect.bottom + fLineWidth << " m " << rect.right << " "
              << rect.bottom + fLineWidth << " l S\n";
 
   CPDF_Dictionary* pExtGStateDict =
       GenerateExtGStateDict(*pAnnotDict, sExtGSDictName, "Normal");
   GenerateAndSetAPDict(pDoc, pAnnotDict, sAppStream, pExtGStateDict);
   return true;
 }
 
+bool CPVT_GenerateAP::GenerateSquigglyAP(CPDF_Document* pDoc,
+                                         CPDF_Dictionary* pAnnotDict) {
+  // If AP dictionary exists, we use the appearance defined in the
+  // existing AP dictionary.
+  if (pAnnotDict->KeyExist("AP"))
+    return false;
+
+  CFX_ByteTextBuf sAppStream;
+  CFX_ByteString sExtGSDictName = "GS";
+  sAppStream << "/" << sExtGSDictName << " gs ";
+
+  sAppStream << GetColorStringWithDefault(pAnnotDict,
+                                          CPVT_Color(CPVT_Color::kRGB, 0, 0, 0),
+                                          PaintOperation::STROKE);
+
+  CFX_FloatRect rect = pAnnotDict->GetRectBy("Rect");
+  rect.Normalize();
+
+  FX_FLOAT fLineWidth = 1.0;
+  sAppStream << fLineWidth << " w ";
+
+  const FX_FLOAT fDelta = 2.0;
+  const FX_FLOAT fTop = rect.bottom + fDelta;
+  const FX_FLOAT fBottom = rect.bottom;
+
+  sAppStream << rect.left << " " << fTop << " m ";
+
+  FX_FLOAT fX = rect.left + fDelta;
+  bool isUpwards = false;
+
+  while (fX < rect.right) {
+    sAppStream << fX << " " << (isUpwards ? fTop : fBottom) << " l ";
+
+    fX += fDelta;
+    isUpwards = !isUpwards;
+  }
+
+  FX_FLOAT fRemainder = rect.right - (fX - fDelta);
+  if (isUpwards)
+    sAppStream << rect.right << " " << fBottom + fRemainder << " l ";
+  else
+    sAppStream << rect.right << " " << fTop - fRemainder << " l ";
+
+  sAppStream << "S\n";
+
+  CPDF_Dictionary* pExtGStateDict =
+      GenerateExtGStateDict(*pAnnotDict, sExtGSDictName, "Normal");
+  GenerateAndSetAPDict(pDoc, pAnnotDict, sAppStream, pExtGStateDict);
+  return true;
+}
+
 bool CPVT_GenerateAP::GenerateStrikeOutAP(CPDF_Document* pDoc,
                                           CPDF_Dictionary* pAnnotDict) {
   // If AP dictionary exists, we use the appearance defined in the
   // existing AP dictionary.
   if (pAnnotDict->KeyExist("AP"))
     return false;
 
   CFX_ByteTextBuf sAppStream;
   CFX_ByteString sExtGSDictName = "GS";
   sAppStream << "/" << sExtGSDictName << " gs ";
@@ skipping 277 matching lines @@
                                                  int32_t nFontIndex,
                                                  FX_FLOAT fFontSize) {
   CFX_ByteTextBuf sRet;
   if (pFontMap) {
     CFX_ByteString sFontAlias = pFontMap->GetPDFFontAlias(nFontIndex);
     if (sFontAlias.GetLength() > 0 && fFontSize > 0)
       sRet << "/" << sFontAlias << " " << fFontSize << " Tf\n";
   }
   return sRet.MakeString();
 }