Generate default AP stream for text annotation.

core/fpdfdoc/cpvt_generateap.cpp

Index: core/fpdfdoc/cpvt_generateap.cpp
diff --git a/core/fpdfdoc/cpvt_generateap.cpp b/core/fpdfdoc/cpvt_generateap.cpp
index da3c052b85809ea938baad35b5ef3b38e07f2f46..0be76a51c590aacb96c1174eadc86ec5bf24d0c7 100644
--- a/core/fpdfdoc/cpvt_generateap.cpp
+++ b/core/fpdfdoc/cpvt_generateap.cpp
@@ -563,6 +563,57 @@ CFX_ByteString GetPaintOperatorString(bool bIsStrokeRect, bool bIsFillRect) {
   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.
@@ -778,6 +829,30 @@ bool CPVT_GenerateAP::GenerateInkAP(CPDF_Document* pDoc,
   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))