Generate default AP stream for text 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 545 matching lines @@
 
   pStreamDict->SetAt("Resources", pResourceDict);
 }
 
 CFX_ByteString GetPaintOperatorString(bool bIsStrokeRect, bool bIsFillRect) {
   if (bIsStrokeRect)
     return bIsFillRect ? "b" : "s";
   return bIsFillRect ? "f" : "n";
 }
 
+CFX_ByteString GenerateTextSymbolAP(const CFX_FloatRect& rect) {
+  CFX_ByteTextBuf sAppStream;
+  sAppStream << CPVT_GenerateAP::GenerateColorAP(
+      CPVT_Color(CPVT_Color::kRGB, 1, 1, 0), PaintOperation::FILL);
+  sAppStream << CPVT_GenerateAP::GenerateColorAP(
+      CPVT_Color(CPVT_Color::kRGB, 0, 0, 0), PaintOperation::STROKE);
+
+  const FX_FLOAT fBorderWidth = 1;
+  sAppStream << fBorderWidth << " w\n";
+
+  const FX_FLOAT fHalfWidth = fBorderWidth / 2;
+  const FX_FLOAT fTipDelta = 4;
+
+  const FX_FLOAT fLeftBound = rect.left + fHalfWidth;

[Lei Zhang, 2016/08/22 22:53:38]

Can we create a new FloatRect, Inflate() it, and use it's values below?

[jaepark, 2016/08/22 23:19:51]

Done.

+  const FX_FLOAT fRightBound = rect.right - fHalfWidth;
+  const FX_FLOAT fBottomBound = rect.bottom + fHalfWidth;
+  const FX_FLOAT fTopBound = rect.top - fHalfWidth;
+
+  // Draw outer box.
+  sAppStream << fLeftBound << " " << fBottomBound + fTipDelta << " m\n"
+             << fLeftBound << " " << fTopBound << " l\n"
+             << fRightBound << " " << fTopBound << " l\n"
+             << fRightBound << " " << fBottomBound + fTipDelta << " l\n"
+             << fLeftBound + (2 * fTipDelta) << " " << fBottomBound + fTipDelta
+             << " l\n"
+             << fLeftBound + fTipDelta + (fTipDelta / 2) << " " << fBottomBound
+             << " l\n"
+             << fLeftBound + fTipDelta << " " << fBottomBound + fTipDelta
+             << " l\n"
+             << fLeftBound + fTipDelta << " " << fBottomBound + fTipDelta
+             << " l\n"
+             << fLeftBound << " " << fBottomBound + fTipDelta << " l\n";
+
+  // Draw inner lines.
+  const FX_FLOAT fXDelta = 2;
+  const FX_FLOAT fYDelta = (fTopBound - (fBottomBound + fTipDelta)) / 4;
+  sAppStream << fLeftBound + fXDelta << " " << fTopBound - fYDelta << " m\n"
+             << fRightBound - fXDelta << " " << fTopBound - fYDelta << " l\n"
+             << fLeftBound + fXDelta << " " << fTopBound - (2 * fYDelta)
+             << " m\n"
+             << fRightBound - fXDelta << " " << fTopBound - (2 * fYDelta)
+             << " l\n"
+             << fLeftBound + fXDelta << " " << fTopBound - (3 * fYDelta)
+             << " m\n"
+             << fRightBound - fXDelta << " " << fTopBound - (3 * fYDelta)
+             << " l\n"
+             << "B*\n";
+
+  return sAppStream.MakeString();
+}
+
 bool ShouldGenerateAPForAnnotation(CPDF_Dictionary* pAnnotDict) {
   // If AP dictionary exists, we use the appearance defined in the
   // existing AP dictionary.
   if (pAnnotDict->KeyExist("AP"))
     return false;
 
   return !CPDF_Annot::IsAnnotationHidden(pAnnotDict);
 }
 
 }  // namespace
@@ skipping 195 matching lines @@
 
     sAppStream << "S\n";
   }
 
   CPDF_Dictionary* pExtGStateDict =
       GenerateExtGStateDict(*pAnnotDict, sExtGSDictName, "Normal");
   GenerateAndSetAPDict(pDoc, pAnnotDict, sAppStream, pExtGStateDict);
   return true;
 }
 
+bool CPVT_GenerateAP::GenerateTextAP(CPDF_Document* pDoc,
+                                     CPDF_Dictionary* pAnnotDict) {
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
+    return false;
+
+  CFX_ByteTextBuf sAppStream;
+  CFX_ByteString sExtGSDictName = "GS";
+  sAppStream << "/" << sExtGSDictName << " gs ";
+
+  CFX_FloatRect rect = pAnnotDict->GetRectBy("Rect");
+  const FX_FLOAT fNoteLength = 20;
+  CFX_FloatRect noteRect(rect.left, rect.bottom, rect.left + fNoteLength,
+                         rect.bottom + fNoteLength);
+  pAnnotDict->SetAtRect("Rect", noteRect);
+
+  sAppStream << GenerateTextSymbolAP(noteRect);
+
+  CPDF_Dictionary* pExtGStateDict =
+      GenerateExtGStateDict(*pAnnotDict, sExtGSDictName, "Normal");
+  GenerateAndSetAPDict(pDoc, pAnnotDict, sAppStream, pExtGStateDict);
+
+  return true;
+}
+
 bool CPVT_GenerateAP::GenerateUnderlineAP(CPDF_Document* pDoc,
                                           CPDF_Dictionary* pAnnotDict) {
   if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
   CFX_ByteString sExtGSDictName = "GS";
   sAppStream << "/" << sExtGSDictName << " gs ";
 
   sAppStream << GetColorStringWithDefault(pAnnotDict->GetArrayBy("C"),
@@ skipping 399 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();
 }