Encapsulate CPDF_PageObject's rect member.

At the same time, change it from 4 floats to a CFX_FloatRect.

Change-Id: I00ded941723d6a264b7a17c73fd337e66b449308
Reviewed-on: https://pdfium-review.googlesource.com/c/43570
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

11 files changed, 38 insertions, 59 deletions

diff --git a/core/fpdfapi/page/cpdf_contentparser.cpp b/core/fpdfapi/page/cpdf_contentparser.cpp
index 2cbac8f447..3427fe5230 100644
--- a/core/fpdfapi/page/cpdf_contentparser.cpp
+++ b/core/fpdfapi/page/cpdf_contentparser.cpp
@@ -234,9 +234,7 @@ CPDF_ContentParser::Stage CPDF_ContentParser::CheckClip() {
     CFX_PointF point0 = ClipPath.GetPoint(0);
     CFX_PointF point2 = ClipPath.GetPoint(2);
     CFX_FloatRect old_rect(point0.x, point0.y, point2.x, point2.y);
-    CFX_FloatRect obj_rect(pObj->m_Left, pObj->m_Bottom, pObj->m_Right,
-                           pObj->m_Top);
-    if (old_rect.Contains(obj_rect))
+    if (old_rect.Contains(pObj->GetRect()))
       pObj->m_ClipPath.SetNull();
   }
   return Stage::kComplete;
diff --git a/core/fpdfapi/page/cpdf_formobject.cpp b/core/fpdfapi/page/cpdf_formobject.cpp
index 22ac0d3823..a7c2643b66 100644
--- a/core/fpdfapi/page/cpdf_formobject.cpp
+++ b/core/fpdfapi/page/cpdf_formobject.cpp
@@ -41,10 +41,5 @@ CPDF_PageObject::Type CPDF_FormObject::GetType() const {
 }
 
 void CPDF_FormObject::CalcBoundingBox() {
-  CFX_FloatRect form_rect =
-      m_FormMatrix.TransformRect(m_pForm->CalcBoundingBox());
-  m_Left = form_rect.left;
-  m_Bottom = form_rect.bottom;
-  m_Right = form_rect.right;
-  m_Top = form_rect.top;
+  SetRect(m_FormMatrix.TransformRect(m_pForm->CalcBoundingBox()));
 }
diff --git a/core/fpdfapi/page/cpdf_imageobject.cpp b/core/fpdfapi/page/cpdf_imageobject.cpp
index 516a6e8cad..2b3d7b0de3 100644
--- a/core/fpdfapi/page/cpdf_imageobject.cpp
+++ b/core/fpdfapi/page/cpdf_imageobject.cpp
@@ -44,8 +44,8 @@ const CPDF_ImageObject* CPDF_ImageObject::AsImage() const {
 }
 
 void CPDF_ImageObject::CalcBoundingBox() {
-  std::tie(m_Left, m_Right, m_Top, m_Bottom) =
-      m_Matrix.TransformRect(0.f, 1.f, 1.f, 0.f);
+  static constexpr CFX_FloatRect kRect(0.0f, 0.0f, 1.0f, 1.0f);
+  SetRect(m_Matrix.TransformRect(kRect));
 }
 
 void CPDF_ImageObject::SetImage(const RetainPtr<CPDF_Image>& pImage) {
diff --git a/core/fpdfapi/page/cpdf_pageobject.cpp b/core/fpdfapi/page/cpdf_pageobject.cpp
index 0c3a850936..c61a7c333d 100644
--- a/core/fpdfapi/page/cpdf_pageobject.cpp
+++ b/core/fpdfapi/page/cpdf_pageobject.cpp
@@ -9,11 +9,11 @@
 constexpr int32_t CPDF_PageObject::kNoContentStream;
 
 CPDF_PageObject::CPDF_PageObject(int32_t content_stream)
-    : m_bDirty(false), m_ContentStream(content_stream) {}
+    : m_ContentStream(content_stream) {}
 
 CPDF_PageObject::CPDF_PageObject() : CPDF_PageObject(kNoContentStream) {}
 
-CPDF_PageObject::~CPDF_PageObject() {}
+CPDF_PageObject::~CPDF_PageObject() = default;
 
 bool CPDF_PageObject::IsText() const {
   return false;
@@ -77,21 +77,18 @@ const CPDF_FormObject* CPDF_PageObject::AsForm() const {
 
 void CPDF_PageObject::CopyData(const CPDF_PageObject* pSrc) {
   CopyStates(*pSrc);
-  m_Left = pSrc->m_Left;
-  m_Right = pSrc->m_Right;
-  m_Top = pSrc->m_Top;
-  m_Bottom = pSrc->m_Bottom;
+  m_Rect = pSrc->m_Rect;
   m_bDirty = true;
 }
 
-void CPDF_PageObject::TransformClipPath(CFX_Matrix& matrix) {
+void CPDF_PageObject::TransformClipPath(const CFX_Matrix& matrix) {
   if (!m_ClipPath.HasRef())
     return;
   m_ClipPath.Transform(matrix);
   SetDirty(true);
 }
 
-void CPDF_PageObject::TransformGeneralState(CFX_Matrix& matrix) {
+void CPDF_PageObject::TransformGeneralState(const CFX_Matrix& matrix) {
   if (!m_GeneralState.HasRef())
     return;
   m_GeneralState.GetMutableMatrix()->Concat(matrix);
diff --git a/core/fpdfapi/page/cpdf_pageobject.h b/core/fpdfapi/page/cpdf_pageobject.h
index 1dfe20b6f9..013ef0d03b 100644
--- a/core/fpdfapi/page/cpdf_pageobject.h
+++ b/core/fpdfapi/page/cpdf_pageobject.h
@@ -54,12 +54,11 @@ class CPDF_PageObject : public CPDF_GraphicStates {
 
   void SetDirty(bool value) { m_bDirty = value; }
   bool IsDirty() const { return m_bDirty; }
-  void TransformClipPath(CFX_Matrix& matrix);
-  void TransformGeneralState(CFX_Matrix& matrix);
+  void TransformClipPath(const CFX_Matrix& matrix);
+  void TransformGeneralState(const CFX_Matrix& matrix);
 
-  CFX_FloatRect GetRect() const {
-    return CFX_FloatRect(m_Left, m_Bottom, m_Right, m_Top);
-  }
+  void SetRect(const CFX_FloatRect& rect) { m_Rect = rect; }
+  const CFX_FloatRect& GetRect() const { return m_Rect; }
   FX_RECT GetBBox() const;
   FX_RECT GetTransformedBBox(const CFX_Matrix& matrix) const;
 
@@ -75,20 +74,18 @@ class CPDF_PageObject : public CPDF_GraphicStates {
     m_ContentStream = new_content_stream;
   }
 
-  float m_Left;
-  float m_Right;
-  float m_Top;
-  float m_Bottom;
   CPDF_ContentMark m_ContentMark;
 
  protected:
   void CopyData(const CPDF_PageObject* pSrcObject);
 
+  CFX_FloatRect m_Rect;
+
  private:
   CPDF_PageObject(const CPDF_PageObject& src) = delete;
   void operator=(const CPDF_PageObject& src) = delete;
 
-  bool m_bDirty;
+  bool m_bDirty = false;
   int32_t m_ContentStream;
 };
 
diff --git a/core/fpdfapi/page/cpdf_pageobjectholder.cpp b/core/fpdfapi/page/cpdf_pageobjectholder.cpp
index 67f68c7c42..c6f310f77b 100644
--- a/core/fpdfapi/page/cpdf_pageobjectholder.cpp
+++ b/core/fpdfapi/page/cpdf_pageobjectholder.cpp
@@ -85,10 +85,11 @@ CFX_FloatRect CPDF_PageObjectHolder::CalcBoundingBox() const {
   float bottom = 1000000.0f;
   float top = -1000000.0f;
   for (const auto& pObj : m_PageObjectList) {
-    left = std::min(left, pObj->m_Left);
-    right = std::max(right, pObj->m_Right);
-    bottom = std::min(bottom, pObj->m_Bottom);
-    top = std::max(top, pObj->m_Top);
+    const auto& rect = pObj->GetRect();
+    left = std::min(left, rect.left);
+    right = std::max(right, rect.right);
+    bottom = std::min(bottom, rect.bottom);
+    top = std::max(top, rect.top);
   }
   return CFX_FloatRect(left, bottom, right, top);
 }
diff --git a/core/fpdfapi/page/cpdf_path.h b/core/fpdfapi/page/cpdf_path.h
index 613d715b03..4a984a540c 100644
--- a/core/fpdfapi/page/cpdf_path.h
+++ b/core/fpdfapi/page/cpdf_path.h
@@ -36,6 +36,7 @@ class CPDF_Path {
 
   void Append(const CPDF_Path& other, const CFX_Matrix* pMatrix);
   void Append(const CFX_PathData* pData, const CFX_Matrix* pMatrix);
+  // TODO(thestig): Switch to CFX_FloatRect.
   void AppendRect(float left, float bottom, float right, float top);
   void AppendPoint(const CFX_PointF& point, FXPT_TYPE type, bool close);
 
diff --git a/core/fpdfapi/page/cpdf_pathobject.cpp b/core/fpdfapi/page/cpdf_pathobject.cpp
index 0882dc17f0..84cf45d7e0 100644
--- a/core/fpdfapi/page/cpdf_pathobject.cpp
+++ b/core/fpdfapi/page/cpdf_pathobject.cpp
@@ -53,8 +53,5 @@ void CPDF_PathObject::CalcBoundingBox() {
     rect.bottom += -0.5f;
     rect.top += 0.5f;
   }
-  m_Left = rect.left;
-  m_Right = rect.right;
-  m_Top = rect.top;
-  m_Bottom = rect.bottom;
+  SetRect(rect);
 }
diff --git a/core/fpdfapi/page/cpdf_shadingobject.cpp b/core/fpdfapi/page/cpdf_shadingobject.cpp
index 725e2e4591..bdaceaa7e8 100644
--- a/core/fpdfapi/page/cpdf_shadingobject.cpp
+++ b/core/fpdfapi/page/cpdf_shadingobject.cpp
@@ -27,10 +27,10 @@ void CPDF_ShadingObject::Transform(const CFX_Matrix& matrix) {
   m_Matrix.Concat(matrix);
   if (m_ClipPath.HasRef()) {
     CalcBoundingBox();
-  } else {
-    std::tie(m_Left, m_Right, m_Top, m_Bottom) =
-        matrix.TransformRect(m_Left, m_Right, m_Top, m_Bottom);
+    return;
   }
+
+  SetRect(matrix.TransformRect(GetRect()));
 }
 
 bool CPDF_ShadingObject::IsShading() const {
@@ -48,9 +48,5 @@ const CPDF_ShadingObject* CPDF_ShadingObject::AsShading() const {
 void CPDF_ShadingObject::CalcBoundingBox() {
   if (!m_ClipPath.HasRef())
     return;
-  CFX_FloatRect rect = m_ClipPath.GetClipBox();
-  m_Left = rect.left;
-  m_Bottom = rect.bottom;
-  m_Right = rect.right;
-  m_Top = rect.top;
+  SetRect(m_ClipPath.GetClipBox());
 }
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 0760e150f3..b381705123 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -1106,10 +1106,7 @@ void CPDF_StreamContentParser::Handle_ShadeFill() {
       pObj->m_ClipPath.HasRef() ? pObj->m_ClipPath.GetClipBox() : m_BBox;
   if (pShading->IsMeshShading())
     bbox.Intersect(GetShadingBBox(pShading, pObj->matrix()));
-  pObj->m_Left = bbox.left;
-  pObj->m_Right = bbox.right;
-  pObj->m_Top = bbox.top;
-  pObj->m_Bottom = bbox.bottom;
+  pObj->SetRect(bbox);
   m_pObjectHolder->AppendPageObject(std::move(pObj));
 }
 
diff --git a/core/fpdfapi/page/cpdf_textobject.cpp b/core/fpdfapi/page/cpdf_textobject.cpp
index 84428fee81..b158376293 100644
--- a/core/fpdfapi/page/cpdf_textobject.cpp
+++ b/core/fpdfapi/page/cpdf_textobject.cpp
@@ -273,17 +273,17 @@ CFX_PointF CPDF_TextObject::CalcPositionData(float horz_scale) {
     min_y = min_y * fontsize / 1000;
     max_y = max_y * fontsize / 1000;
   }
-  std::tie(m_Left, m_Right, m_Top, m_Bottom) =
-      GetTextMatrix().TransformRect(min_x, max_x, max_y, min_y);
+  SetRect(
+      GetTextMatrix().TransformRect(CFX_FloatRect(min_x, min_y, max_x, max_y)));
 
   if (!TextRenderingModeIsStrokeMode(m_TextState.GetTextMode()))
     return ret;
 
   float half_width = m_GraphState.GetLineWidth() / 2;
-  m_Left -= half_width;
-  m_Right += half_width;
-  m_Top += half_width;
-  m_Bottom -= half_width;
+  m_Rect.left -= half_width;
+  m_Rect.right += half_width;
+  m_Rect.top += half_width;
+  m_Rect.bottom -= half_width;
 
   return ret;
 }
@@ -293,10 +293,10 @@ void CPDF_TextObject::SetPosition(float x, float y) {
   float dy = y - m_Pos.y;
   m_Pos.x = x;
   m_Pos.y = y;
-  m_Left += dx;
-  m_Right += dx;
-  m_Top += dy;
-  m_Bottom += dy;
+  m_Rect.left += dx;
+  m_Rect.right += dx;
+  m_Rect.top += dy;
+  m_Rect.bottom += dy;
 }
 
 void CPDF_TextObject::RecalcPositionData() {