Hidden annotations should not be drawn

Now that PDFium supports drawing of more annotation
types, it should also respect the "hidden" flag that
annotations might feature.
For instance, in IE/Acroread if an annotation is flagged as
"hidden" it does not get drawn.

CL adds a check for the specific "hidden" flag, not drawing
annotation that are flagged with it, in order to match IE + acrobat
reader behavior.

The "flags" definition can be seen by looking at "/F {value}"
syntax in a PDF file source, where {value} is an predefined
integer value.

Test: PDF files being added in [1].

[1] https://codereview.chromium.org/2239713003/

BUG=62625

Review-Url: https://codereview.chromium.org/2239853002

3 files changed, 28 insertions, 21 deletions

diff --git a/core/fpdfdoc/cpdf_annot.cpp b/core/fpdfdoc/cpdf_annot.cpp
index 2b9b936cd1..617ea0fdc3 100644
--- a/core/fpdfdoc/cpdf_annot.cpp
+++ b/core/fpdfdoc/cpdf_annot.cpp
@@ -133,11 +133,20 @@ static CPDF_Form* FPDFDOC_Annot_GetMatrix(const CPDF_Page* pPage,
   matrix.Concat(*pUser2Device);
   return pForm;
 }
+
+// static
+bool CPDF_Annot::IsAnnotationHidden(CPDF_Dictionary* pAnnotDict) {
+  return !!(pAnnotDict->GetIntegerBy("F") & ANNOTFLAG_HIDDEN);
+}
+
 FX_BOOL CPDF_Annot::DrawAppearance(CPDF_Page* pPage,
                                    CFX_RenderDevice* pDevice,
                                    const CFX_Matrix* pUser2Device,
                                    AppearanceMode mode,
                                    const CPDF_RenderOptions* pOptions) {
+  if (IsAnnotationHidden(m_pAnnotDict))
+    return FALSE;
+
   CFX_Matrix matrix;
   CPDF_Form* pForm =
       FPDFDOC_Annot_GetMatrix(pPage, this, mode, pUser2Device, matrix);
diff --git a/core/fpdfdoc/cpvt_generateap.cpp b/core/fpdfdoc/cpvt_generateap.cpp
index f15869b130..da3c052b85 100644
--- a/core/fpdfdoc/cpvt_generateap.cpp
+++ b/core/fpdfdoc/cpvt_generateap.cpp
@@ -14,6 +14,7 @@
 #include "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h"
 #include "core/fpdfdoc/cpvt_color.h"
 #include "core/fpdfdoc/cpvt_fontmap.h"
+#include "core/fpdfdoc/include/cpdf_annot.h"
 #include "core/fpdfdoc/include/cpdf_formfield.h"
 #include "core/fpdfdoc/include/cpvt_word.h"
 
@@ -562,6 +563,15 @@ CFX_ByteString GetPaintOperatorString(bool bIsStrokeRect, bool bIsFillRect) {
   return bIsFillRect ? "f" : "n";
 }
 
+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
 
 bool FPDF_GenerateAP(CPDF_Document* pDoc, CPDF_Dictionary* pAnnotDict) {
@@ -614,9 +624,7 @@ bool CPVT_GenerateAP::GenerateTextFieldAP(CPDF_Document* pDoc,
 
 bool CPVT_GenerateAP::GenerateCircleAP(CPDF_Document* pDoc,
                                        CPDF_Dictionary* pAnnotDict) {
-  // If AP dictionary exists, we use the appearance defined in the
-  // existing AP dictionary.
-  if (pAnnotDict->KeyExist("AP"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
@@ -690,9 +698,7 @@ bool CPVT_GenerateAP::GenerateCircleAP(CPDF_Document* pDoc,
 
 bool CPVT_GenerateAP::GenerateHighlightAP(CPDF_Document* pDoc,
                                           CPDF_Dictionary* pAnnotDict) {
-  // If AP dictionary exists, we use the appearance defined in the
-  // existing AP dictionary.
-  if (pAnnotDict->KeyExist("AP"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
@@ -720,9 +726,7 @@ bool CPVT_GenerateAP::GenerateHighlightAP(CPDF_Document* pDoc,
 
 bool CPVT_GenerateAP::GenerateInkAP(CPDF_Document* pDoc,
                                     CPDF_Dictionary* pAnnotDict) {
-  // If AP dictionary exists, we use the appearance defined in the
-  // existing AP dictionary.
-  if (pAnnotDict->KeyExist("AP"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   FX_FLOAT fBorderWidth = GetBorderWidth(*pAnnotDict);
@@ -776,9 +780,7 @@ bool CPVT_GenerateAP::GenerateInkAP(CPDF_Document* pDoc,
 
 bool CPVT_GenerateAP::GenerateUnderlineAP(CPDF_Document* pDoc,
                                           CPDF_Dictionary* pAnnotDict) {
-  // If AP dictionary exists, we use the appearance defined in the
-  // existing AP dictionary.
-  if (pAnnotDict->KeyExist("AP"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
@@ -805,9 +807,7 @@ bool CPVT_GenerateAP::GenerateUnderlineAP(CPDF_Document* pDoc,
 
 bool CPVT_GenerateAP::GenerateSquareAP(CPDF_Document* pDoc,
                                        CPDF_Dictionary* pAnnotDict) {
-  // If AP dictionary exists, we use the appearance defined in the
-  // existing AP dictionary.
-  if (pAnnotDict->KeyExist("AP"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
@@ -855,9 +855,7 @@ bool CPVT_GenerateAP::GenerateSquareAP(CPDF_Document* pDoc,
 
 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"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
@@ -906,9 +904,7 @@ bool CPVT_GenerateAP::GenerateSquigglyAP(CPDF_Document* pDoc,
 
 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"))
+  if (!ShouldGenerateAPForAnnotation(pAnnotDict))
     return false;
 
   CFX_ByteTextBuf sAppStream;
diff --git a/core/fpdfdoc/include/cpdf_annot.h b/core/fpdfdoc/include/cpdf_annot.h
index 99efd98886..4999349155 100644
--- a/core/fpdfdoc/include/cpdf_annot.h
+++ b/core/fpdfdoc/include/cpdf_annot.h
@@ -37,6 +37,8 @@ class CPDF_Annot {
  public:
   enum AppearanceMode { Normal, Rollover, Down };
 
+  static bool IsAnnotationHidden(CPDF_Dictionary* pAnnotDict);
+
   CPDF_Annot(CPDF_Dictionary* pDict, CPDF_Document* pDocument);
   ~CPDF_Annot();