Add an enum to represent text rendering modes.

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

5 files changed, 105 insertions, 57 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];
 };
 
diff --git a/core/fpdfapi/fpdf_render/fpdf_render_text.cpp b/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
index f2704b7d60..ce73208896 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
@@ -6,6 +6,8 @@
 
 #include "core/fpdfapi/fpdf_render/render_int.h"
 
+#include <vector>
+
 #include "core/fpdfapi/fpdf_font/cpdf_cidfont.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type3char.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type3font.h"
@@ -211,72 +213,76 @@ CFX_GlyphBitmap* CPDF_Type3Cache::RenderGlyph(CPDF_Type3Glyphs* pSize,
 FX_BOOL CPDF_RenderStatus::ProcessText(const CPDF_TextObject* textobj,
                                        const CFX_Matrix* pObj2Device,
                                        CFX_PathData* pClippingPath) {
-  if (textobj->m_nChars == 0) {
+  if (textobj->m_nChars == 0)
     return TRUE;
-  }
-  int text_render_mode = textobj->m_TextState.GetObject()->m_TextMode;
-  if (text_render_mode == 3) {
+
+  const TextRenderingMode& text_render_mode =
+      textobj->m_TextState.GetObject()->m_TextMode;
+  if (text_render_mode == TextRenderingMode::MODE_INVISIBLE)
     return TRUE;
-  }
+
   CPDF_Font* pFont = textobj->m_TextState.GetFont();
-  if (pFont->IsType3Font()) {
+  if (pFont->IsType3Font())
     return ProcessType3Text(textobj, pObj2Device);
-  }
-  FX_BOOL bFill = FALSE, bStroke = FALSE, bClip = FALSE;
+
+  bool bFill = false;
+  bool bStroke = false;
+  bool bClip = false;
   if (pClippingPath) {
-    bClip = TRUE;
+    bClip = true;
   } else {
     switch (text_render_mode) {
-      case 0:
-      case 4:
-        bFill = TRUE;
+      case TextRenderingMode::MODE_FILL:
+      case TextRenderingMode::MODE_FILL_CLIP:
+        bFill = true;
         break;
-      case 1:
-      case 5:
-        if (!pFont->GetFace() &&
-            !(pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_GLYPHPATH)) {
-          bFill = TRUE;
+      case TextRenderingMode::MODE_STROKE:
+      case TextRenderingMode::MODE_STROKE_CLIP:
+        if (pFont->GetFace() ||
+            (pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_GLYPHPATH)) {
+          bStroke = true;
         } else {
-          bStroke = TRUE;
+          bFill = true;
         }
         break;
-      case 2:
-      case 6:
-        if (!pFont->GetFace() &&
-            !(pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_GLYPHPATH)) {
-          bFill = TRUE;
-        } else {
-          bFill = bStroke = TRUE;
+      case TextRenderingMode::MODE_FILL_STROKE:
+      case TextRenderingMode::MODE_FILL_STROKE_CLIP:
+        bFill = true;
+        if (pFont->GetFace() ||
+            (pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_GLYPHPATH)) {
+          bStroke = true;
         }
         break;
-      case 3:
-      case 7:
+      case TextRenderingMode::MODE_INVISIBLE:
+        // Already handled above, but the compiler is not smart enough to
+        // realize it. Fall through.
+        ASSERT(false);
+      case TextRenderingMode::MODE_CLIP:
         return TRUE;
-      default:
-        bFill = TRUE;
     }
   }
-  FX_ARGB stroke_argb = 0, fill_argb = 0;
-  FX_BOOL bPattern = FALSE;
+  FX_ARGB stroke_argb = 0;
+  FX_ARGB fill_argb = 0;
+  bool bPattern = false;
   if (bStroke) {
     if (textobj->m_ColorState.GetStrokeColor()->IsPattern()) {
-      bPattern = TRUE;
+      bPattern = true;
     } else {
       stroke_argb = GetStrokeArgb(textobj);
     }
   }
   if (bFill) {
     if (textobj->m_ColorState.GetFillColor()->IsPattern()) {
-      bPattern = TRUE;
+      bPattern = true;
     } else {
       fill_argb = GetFillArgb(textobj);
     }
   }
   CFX_Matrix text_matrix;
   textobj->GetTextMatrix(&text_matrix);
-  if (IsAvailableMatrix(text_matrix) == FALSE) {
+  if (!IsAvailableMatrix(text_matrix))
     return TRUE;
-  }
+
   FX_FLOAT font_size = textobj->m_TextState.GetFontSize();
   if (bPattern) {
     DrawTextPathWithPattern(textobj, pObj2Device, pFont, font_size,
@@ -319,6 +325,7 @@ FX_BOOL CPDF_RenderStatus::ProcessText(const CPDF_TextObject* textobj,
       m_pDevice, textobj->m_nChars, textobj->m_pCharCodes, textobj->m_pCharPos,
       pFont, font_size, &text_matrix, fill_argb, &m_Options);
 }
+
 CPDF_Type3Cache* CPDF_RenderStatus::GetCachedType3(CPDF_Type3Font* pFont) {
   if (!pFont->m_pDocument) {
     return NULL;
@@ -336,17 +343,15 @@ static void ReleaseCachedType3(CPDF_Type3Font* pFont) {
 
 class CPDF_RefType3Cache {
  public:
-  CPDF_RefType3Cache(CPDF_Type3Font* pType3Font) {
-    m_dwCount = 0;
-    m_pType3Font = pType3Font;
-  }
+  explicit CPDF_RefType3Cache(CPDF_Type3Font* pType3Font)
+      : m_dwCount(0), m_pType3Font(pType3Font) {}
   ~CPDF_RefType3Cache() {
     while (m_dwCount--) {
       ReleaseCachedType3(m_pType3Font);
     }
   }
   uint32_t m_dwCount;
-  CPDF_Type3Font* m_pType3Font;
+  CPDF_Type3Font* const m_pType3Font;
 };
 
 FX_BOOL CPDF_RenderStatus::ProcessType3Text(const CPDF_TextObject* textobj,