Fixup FX_RECT and FX_SMALL_RECT classes.

Put these first, so later on more complicated classes can
have constructors that take these as arguments.

Add better constructors, and call appropriately.  Also don't
be afraid to return these from methods since RVO.

R=dsinclair@chromium.org

Review URL: https://codereview.chromium.org/1745683002 .

2 files changed, 49 insertions, 81 deletions

diff --git a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
index fb601e7113..411f77254b 100644
--- a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
+++ b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
@@ -306,8 +306,7 @@ void CPDF_Font::CheckFontMetrics() {
     } else {
       FX_BOOL bFirst = TRUE;
       for (int i = 0; i < 256; i++) {
-        FX_RECT rect;
-        GetCharBBox(i, rect);
+        FX_RECT rect = GetCharBBox(i);
         if (rect.left == rect.right) {
           continue;
         }
@@ -332,19 +331,10 @@ void CPDF_Font::CheckFontMetrics() {
     }
   }
   if (m_Ascent == 0 && m_Descent == 0) {
-    FX_RECT rect;
-    GetCharBBox('A', rect);
-    if (rect.bottom == rect.top) {
-      m_Ascent = m_FontBBox.top;
-    } else {
-      m_Ascent = rect.top;
-    }
-    GetCharBBox('g', rect);
-    if (rect.bottom == rect.top) {
-      m_Descent = m_FontBBox.bottom;
-    } else {
-      m_Descent = rect.bottom;
-    }
+    FX_RECT rect = GetCharBBox('A');
+    m_Ascent = rect.bottom == rect.top ? m_FontBBox.top : rect.top;
+    rect = GetCharBBox('g');
+    m_Descent = rect.bottom == rect.top ? m_FontBBox.bottom : rect.bottom;
   }
 }
 
@@ -743,13 +733,11 @@ FX_BOOL CPDF_Font::IsStandardFont() const {
   return TRUE;
 }
 
-CPDF_SimpleFont::CPDF_SimpleFont() {
-  FXSYS_memset(m_CharBBox, 0xff, sizeof m_CharBBox);
+CPDF_SimpleFont::CPDF_SimpleFont()
+    : m_pCharNames(nullptr), m_BaseEncoding(PDFFONT_ENCODING_BUILTIN) {
   FXSYS_memset(m_CharWidth, 0xff, sizeof m_CharWidth);
   FXSYS_memset(m_GlyphIndex, 0xff, sizeof m_GlyphIndex);
   FXSYS_memset(m_ExtGID, 0xff, sizeof m_ExtGID);
-  m_pCharNames = NULL;
-  m_BaseEncoding = PDFFONT_ENCODING_BUILTIN;
 }
 
 CPDF_SimpleFont::~CPDF_SimpleFont() {
@@ -795,21 +783,23 @@ void CPDF_SimpleFont::LoadCharMetrics(int charcode) {
   if (err) {
     return;
   }
-  m_CharBBox[charcode].Left = TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face);
-  m_CharBBox[charcode].Right = TT2PDF(
-      FXFT_Get_Glyph_HoriBearingX(face) + FXFT_Get_Glyph_Width(face), face);
-  m_CharBBox[charcode].Top = TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face);
-  m_CharBBox[charcode].Bottom = TT2PDF(
-      FXFT_Get_Glyph_HoriBearingY(face) - FXFT_Get_Glyph_Height(face), face);
+  m_CharBBox[charcode] = FX_SMALL_RECT(
+      TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face),
+      TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face),
+      TT2PDF(FXFT_Get_Glyph_HoriBearingX(face) + FXFT_Get_Glyph_Width(face),
+             face),
+      TT2PDF(FXFT_Get_Glyph_HoriBearingY(face) - FXFT_Get_Glyph_Height(face),
+             face));
+
   if (m_bUseFontWidth) {
     int TT_Width = TT2PDF(FXFT_Get_Glyph_HoriAdvance(face), face);
     if (m_CharWidth[charcode] == 0xffff) {
       m_CharWidth[charcode] = TT_Width;
     } else if (TT_Width && !IsEmbedded()) {
-      m_CharBBox[charcode].Right =
-          m_CharBBox[charcode].Right * m_CharWidth[charcode] / TT_Width;
-      m_CharBBox[charcode].Left =
-          m_CharBBox[charcode].Left * m_CharWidth[charcode] / TT_Width;
+      m_CharBBox[charcode].right =
+          m_CharBBox[charcode].right * m_CharWidth[charcode] / TT_Width;
+      m_CharBBox[charcode].left =
+          m_CharBBox[charcode].left * m_CharWidth[charcode] / TT_Width;
     }
   }
 }
@@ -827,17 +817,14 @@ int CPDF_SimpleFont::GetCharWidthF(FX_DWORD charcode, int level) {
   return (int16_t)m_CharWidth[charcode];
 }
 
-void CPDF_SimpleFont::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
-  if (charcode > 0xff) {
+FX_RECT CPDF_SimpleFont::GetCharBBox(FX_DWORD charcode, int level) {
+  if (charcode > 0xff)
     charcode = 0;
-  }
-  if (m_CharBBox[charcode].Left == (int16_t)0xffff) {
+
+  if (m_CharBBox[charcode].left == FX_SMALL_RECT::kInvalid)
     LoadCharMetrics(charcode);
-  }
-  rect.left = m_CharBBox[charcode].Left;
-  rect.right = m_CharBBox[charcode].Right;
-  rect.bottom = m_CharBBox[charcode].Bottom;
-  rect.top = m_CharBBox[charcode].Top;
+
+  return FX_RECT(m_CharBBox[charcode]);
 }
 
 const FX_CHAR* GetAdobeCharName(int iBaseEncoding,
@@ -1704,16 +1691,9 @@ int CPDF_Type3Font::GetCharWidthF(FX_DWORD charcode, int level) {
   return pChar ? pChar->m_Width : 0;
 }
 
-void CPDF_Type3Font::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
+FX_RECT CPDF_Type3Font::GetCharBBox(FX_DWORD charcode, int level) {
   const CPDF_Type3Char* pChar = LoadChar(charcode, level);
-  if (!pChar) {
-    rect.left = 0;
-    rect.right = 0;
-    rect.top = 0;
-    rect.bottom = 0;
-    return;
-  }
-  rect = pChar->m_BBox;
+  return pChar ? pChar->m_BBox : FX_RECT();
 }
 
 CPDF_Type3Char::CPDF_Type3Char(CPDF_Form* pForm)
diff --git a/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp b/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
index de6ed1b9b5..1a78b1f93c 100644
--- a/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
+++ b/core/src/fpdfapi/fpdf_font/fpdf_font_cid.cpp
@@ -1057,7 +1057,6 @@ CPDF_CIDFont::CPDF_CIDFont()
       m_pAnsiWidths(nullptr),
       m_bAdobeCourierStd(FALSE),
       m_pTTGSUBTable(nullptr) {
-  FXSYS_memset(m_CharBBox, 0xff, 256 * sizeof(FX_SMALL_RECT));
 }
 
 CPDF_CIDFont::~CPDF_CIDFont() {
@@ -1299,19 +1298,15 @@ FX_BOOL CPDF_CIDFont::Load() {
   return TRUE;
 }
 
-void CPDF_CIDFont::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
-  if (charcode < 256 && m_CharBBox[charcode].Right != -1) {
-    rect.bottom = m_CharBBox[charcode].Bottom;
-    rect.left = m_CharBBox[charcode].Left;
-    rect.right = m_CharBBox[charcode].Right;
-    rect.top = m_CharBBox[charcode].Top;
-    return;
-  }
+FX_RECT CPDF_CIDFont::GetCharBBox(FX_DWORD charcode, int level) {
+  if (charcode < 256 && m_CharBBox[charcode].right != FX_SMALL_RECT::kInvalid)
+    return FX_RECT(m_CharBBox[charcode]);
+
+  FX_RECT rect;
   FX_BOOL bVert = FALSE;
   int glyph_index = GlyphFromCharCode(charcode, &bVert);
   FXFT_Face face = m_Font.GetFace();
   if (face) {
-    rect.left = rect.bottom = rect.right = rect.top = 0;
     if (FXFT_Is_Face_Tricky(face)) {
       int err = FXFT_Load_Glyph(face, glyph_index,
                                 FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
@@ -1324,15 +1319,12 @@ void CPDF_CIDFont::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
           int pixel_size_x = ((FXFT_Face)face)->size->metrics.x_ppem;
           int pixel_size_y = ((FXFT_Face)face)->size->metrics.y_ppem;
           if (pixel_size_x == 0 || pixel_size_y == 0) {
-            rect.left = cbox.xMin;
-            rect.right = cbox.xMax;
-            rect.top = cbox.yMax;
-            rect.bottom = cbox.yMin;
+            rect = FX_RECT(cbox.xMin, cbox.yMax, cbox.xMax, cbox.yMin);
           } else {
-            rect.left = cbox.xMin * 1000 / pixel_size_x;
-            rect.right = cbox.xMax * 1000 / pixel_size_x;
-            rect.top = cbox.yMax * 1000 / pixel_size_y;
-            rect.bottom = cbox.yMin * 1000 / pixel_size_y;
+            rect = FX_RECT(cbox.xMin * 1000 / pixel_size_x,
+                           cbox.yMax * 1000 / pixel_size_y,
+                           cbox.xMax * 1000 / pixel_size_x,
+                           cbox.yMin * 1000 / pixel_size_y);
           }
           if (rect.top > FXFT_Get_Face_Ascender(face)) {
             rect.top = FXFT_Get_Face_Ascender(face);
@@ -1346,19 +1338,17 @@ void CPDF_CIDFont::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
     } else {
       int err = FXFT_Load_Glyph(face, glyph_index, FXFT_LOAD_NO_SCALE);
       if (err == 0) {
-        rect.left = TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face);
-        rect.right = TT2PDF(
-            FXFT_Get_Glyph_HoriBearingX(face) + FXFT_Get_Glyph_Width(face),
-            face);
-        rect.top = TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face);
+        rect = FX_RECT(TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face),
+                       TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face),
+                       TT2PDF(FXFT_Get_Glyph_HoriBearingX(face) +
+                                  FXFT_Get_Glyph_Width(face),
+                              face),
+                       TT2PDF(FXFT_Get_Glyph_HoriBearingY(face) -
+                                  FXFT_Get_Glyph_Height(face),
+                              face));
         rect.top += rect.top / 64;
-        rect.bottom = TT2PDF(
-            FXFT_Get_Glyph_HoriBearingY(face) - FXFT_Get_Glyph_Height(face),
-            face);
       }
     }
-  } else {
-    rect = FX_RECT(0, 0, 0, 0);
   }
   if (!m_pFontFile && m_Charset == CIDSET_JAPAN1) {
     FX_WORD CID = CIDFromCharCode(charcode);
@@ -1375,12 +1365,10 @@ void CPDF_CIDFont::GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level) {
       rect = rect_f.GetOutterRect();
     }
   }
-  if (charcode < 256) {
-    m_CharBBox[charcode].Bottom = (short)rect.bottom;
-    m_CharBBox[charcode].Left = (short)rect.left;
-    m_CharBBox[charcode].Right = (short)rect.right;
-    m_CharBBox[charcode].Top = (short)rect.top;
-  }
+  if (charcode < 256)
+    m_CharBBox[charcode] = rect.ToSmallRect();
+
+  return rect;
 }
 int CPDF_CIDFont::GetCharWidthF(FX_DWORD charcode, int level) {
   if (m_pAnsiWidths && charcode < 0x80) {