Add an enum to represent text rendering modes.

Review-Url: https://codereview.chromium.org/1999553002

4 files changed, 60 insertions, 17 deletions

diff --git a/core/fpdfapi/fpdf_page/cpdf_textobject.cpp b/core/fpdfapi/fpdf_page/cpdf_textobject.cpp
index a3fbbad8b0..72658c67ba 100644
--- a/core/fpdfapi/fpdf_page/cpdf_textobject.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_textobject.cpp
@@ -313,8 +313,7 @@ void CPDF_TextObject::CalcPositionData(FX_FLOAT* pTextAdvanceX,
   m_Bottom = min_y;
   m_Top = max_y;
   matrix.TransformRect(m_Left, m_Right, m_Top, m_Bottom);
-  int textmode = m_TextState.GetObject()->m_TextMode;
-  if (textmode == 1 || textmode == 2 || textmode == 5 || textmode == 6) {
+  if (TextRenderingModeIsStrokeMode(m_TextState.GetObject()->m_TextMode)) {
     FX_FLOAT half_width = m_GraphState.GetObject()->m_LineWidth / 2;
     m_Left -= half_width;
     m_Right += half_width;
diff --git a/core/fpdfapi/fpdf_page/cpdf_textstatedata.cpp b/core/fpdfapi/fpdf_page/cpdf_textstatedata.cpp
index 5cd6061542..e60af0076e 100644
--- a/core/fpdfapi/fpdf_page/cpdf_textstatedata.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_textstatedata.cpp
@@ -10,13 +10,44 @@
 #include "core/fpdfapi/fpdf_page/pageint.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 
+bool SetTextRenderingModeFromInt(int iMode, TextRenderingMode* mode) {
+  if (iMode < 0 || iMode > 7)
+    return false;
+  *mode = static_cast<TextRenderingMode>(iMode);
+  return true;
+}
+
+bool TextRenderingModeIsClipMode(const TextRenderingMode& mode) {
+  switch (mode) {
+    case TextRenderingMode::MODE_FILL_CLIP:
+    case TextRenderingMode::MODE_STROKE_CLIP:
+    case TextRenderingMode::MODE_FILL_STROKE_CLIP:
+    case TextRenderingMode::MODE_CLIP:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool TextRenderingModeIsStrokeMode(const TextRenderingMode& mode) {
+  switch (mode) {
+    case TextRenderingMode::MODE_STROKE:
+    case TextRenderingMode::MODE_FILL_STROKE:
+    case TextRenderingMode::MODE_STROKE_CLIP:
+    case TextRenderingMode::MODE_FILL_STROKE_CLIP:
+      return true;
+    default:
+      return false;
+  }
+}
+
 CPDF_TextStateData::CPDF_TextStateData()
     : m_pFont(nullptr),
       m_pDocument(nullptr),
       m_FontSize(1.0f),
       m_CharSpace(0),
       m_WordSpace(0),
-      m_TextMode(0) {
+      m_TextMode(TextRenderingMode::MODE_FILL) {
   m_Matrix[0] = m_Matrix[3] = 1.0f;
   m_Matrix[1] = m_Matrix[2] = 0;
   m_CTM[0] = m_CTM[3] = 1.0f;
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
index 0374915af4..4a7b6ad403 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
@@ -816,8 +816,10 @@ void CPDF_StreamContentParser::Handle_EndText() {
   if (m_ClipTextList.empty())
     return;
 
-  if (m_pCurStates->m_TextState.GetObject()->m_TextMode >= 4)
+  if (TextRenderingModeIsClipMode(
+          m_pCurStates->m_TextState.GetObject()->m_TextMode)) {
     m_pCurStates->m_ClipPath.AppendTexts(&m_ClipTextList);
+  }
   m_ClipTextList.clear();
 }
 
@@ -1251,17 +1253,14 @@ void CPDF_StreamContentParser::AddTextObject(CFX_ByteString* pStrs,
   if (nsegs == 0) {
     return;
   }
-  int textmode;
-  if (pFont->IsType3Font()) {
-    textmode = 0;
-  } else {
-    textmode = m_pCurStates->m_TextState.GetObject()->m_TextMode;
-  }
+  const TextRenderingMode text_mode =
+      pFont->IsType3Font() ? TextRenderingMode::MODE_FILL
+                           : m_pCurStates->m_TextState.GetObject()->m_TextMode;
   {
     std::unique_ptr<CPDF_TextObject> pText(new CPDF_TextObject);
     m_pLastTextObject = pText.get();
     SetGraphicStates(m_pLastTextObject, TRUE, TRUE, TRUE);
-    if (textmode && textmode != 3 && textmode != 4 && textmode != 7) {
+    if (TextRenderingModeIsStrokeMode(text_mode)) {
       FX_FLOAT* pCTM = pText->m_TextState.GetModify()->m_CTM;
       pCTM[0] = m_pCurStates->m_CTM.a;
       pCTM[1] = m_pCurStates->m_CTM.c;
@@ -1278,7 +1277,7 @@ void CPDF_StreamContentParser::AddTextObject(CFX_ByteString* pStrs,
                             m_pCurStates->m_TextHorzScale, m_Level);
     m_pCurStates->m_TextX += x_advance;
     m_pCurStates->m_TextY += y_advance;
-    if (textmode > 3) {
+    if (TextRenderingModeIsClipMode(text_mode)) {
       m_ClipTextList.push_back(
           std::unique_ptr<CPDF_TextObject>(pText->Clone()));
     }
@@ -1380,10 +1379,8 @@ void CPDF_StreamContentParser::OnChangeTextMatrix() {
 
 void CPDF_StreamContentParser::Handle_SetTextRenderMode() {
   int mode = GetInteger(0);
-  if (mode < 0 || mode > 7) {
-    return;
-  }
-  m_pCurStates->m_TextState.GetModify()->m_TextMode = mode;
+  SetTextRenderingModeFromInt(
+      mode, &m_pCurStates->m_TextState.GetModify()->m_TextMode);
 }
 
 void CPDF_StreamContentParser::Handle_SetTextRise() {
diff --git a/core/fpdfapi/fpdf_page/include/cpdf_textstatedata.h b/core/fpdfapi/fpdf_page/include/cpdf_textstatedata.h
index feed1a043f..4e33d5f170 100644
--- a/core/fpdfapi/fpdf_page/include/cpdf_textstatedata.h
+++ b/core/fpdfapi/fpdf_page/include/cpdf_textstatedata.h
@@ -12,6 +12,22 @@
 class CPDF_Font;
 class CPDF_Document;
 
+// See PDF Reference 1.7, page 402, table 5.3.
+enum class TextRenderingMode {
+  MODE_FILL = 0,
+  MODE_STROKE = 1,
+  MODE_FILL_STROKE = 2,
+  MODE_INVISIBLE = 3,
+  MODE_FILL_CLIP = 4,
+  MODE_STROKE_CLIP = 5,
+  MODE_FILL_STROKE_CLIP = 6,
+  MODE_CLIP = 7,
+};
+
+bool SetTextRenderingModeFromInt(int iMode, TextRenderingMode* mode);
+bool TextRenderingModeIsClipMode(const TextRenderingMode& mode);
+bool TextRenderingModeIsStrokeMode(const TextRenderingMode& mode);
+
 class CPDF_TextStateData {
  public:
   CPDF_TextStateData();
@@ -23,8 +39,8 @@ class CPDF_TextStateData {
   FX_FLOAT m_FontSize;
   FX_FLOAT m_CharSpace;
   FX_FLOAT m_WordSpace;
+  TextRenderingMode m_TextMode;
   FX_FLOAT m_Matrix[4];
-  int m_TextMode;
   FX_FLOAT m_CTM[4];
 };