Make CPDF_TextState have a CPDF_TextStateData rather than inheriting one.

core/fpdfapi/fpdf_page/cpdf_textstate.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fpdfapi/fpdf_page/cpdf_textstate.h"
 #include "core/fpdfapi/fpdf_page/pageint.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 
+CPDF_TextState::CPDF_TextState() {}
+CPDF_TextState::~CPDF_TextState() {}
+
+void CPDF_TextState::New() {

[dsinclair, 2016/08/30 13:36:10]

Can we call this Initialize()? Or, something other then New()? New makes me
think new/delete of the CPDF_TextState, not the internal ref.

[Tom Sepez, 2016/08/30 16:59:48]

The way I'm thinking about these is that they are like a Maybe<SomeObject> or
base::optional<SomeObject> rather than a pointer, and they behave as if each
object were unique with the sharing of storage just an implementation detail to
save space.  So you're right about New() being a mismatch in that we don't want
to think in ptrs ... hmmm.

The m_Ref.New() call should really be m_Ref.emplace() as it forwards args to the
(textstatedata) ctor.  Should this be emplace() as well?

+  m_Ref.New();
+}
+
+CPDF_Font* CPDF_TextState::GetFont() const {
+  return m_Ref.GetObject()->m_pFont;
+}
+
 void CPDF_TextState::SetFont(CPDF_Font* pFont) {
-  CPDF_TextStateData* pStateData = GetPrivateCopy();
-  if (pStateData) {
-    CPDF_Document* pDoc = pStateData->m_pDocument;
-    CPDF_DocPageData* pPageData = pDoc ? pDoc->GetPageData() : nullptr;
-    if (pPageData && pStateData->m_pFont && !pPageData->IsForceClear()) {
-      pPageData->ReleaseFont(pStateData->m_pFont->GetFontDict());
-    }
-    pStateData->m_pDocument = pFont ? pFont->m_pDocument : nullptr;
-    pStateData->m_pFont = pFont;
-  }
+  m_Ref.GetPrivateCopy()->SetFont(pFont);
+}
+
+FX_FLOAT CPDF_TextState::GetFontSize() const {
+  return m_Ref.GetObject()->m_FontSize;
+}
+
+void CPDF_TextState::SetFontSize(FX_FLOAT size) {
+  m_Ref.GetPrivateCopy()->m_FontSize = size;
+}
+
+const FX_FLOAT* CPDF_TextState::GetMatrix() const {
+  return m_Ref.GetObject()->m_Matrix;
+}
+
+FX_FLOAT* CPDF_TextState::GetMutableMatrix() {
+  return m_Ref.GetPrivateCopy()->m_Matrix;
+}
+
+FX_FLOAT CPDF_TextState::GetCharSpace() const {
+  return m_Ref.GetObject()->m_CharSpace;
+}
+
+void CPDF_TextState::SetCharSpace(FX_FLOAT sp) {
+  m_Ref.GetPrivateCopy()->m_CharSpace = sp;
+}
+
+FX_FLOAT CPDF_TextState::GetWordSpace() const {
+  return m_Ref.GetObject()->m_WordSpace;
+}
+
+void CPDF_TextState::SetWordSpace(FX_FLOAT sp) {
+  m_Ref.GetPrivateCopy()->m_WordSpace = sp;
 }
 
 FX_FLOAT CPDF_TextState::GetFontSizeV() const {
-  const FX_FLOAT* pMatrix = GetMatrix();
-  FX_FLOAT unit = FXSYS_sqrt2(pMatrix[1], pMatrix[3]);
-  FX_FLOAT size = unit * GetFontSize();
-  return (FX_FLOAT)FXSYS_fabs(size);
+  return m_Ref.GetObject()->GetFontSizeV();
 }
 
 FX_FLOAT CPDF_TextState::GetFontSizeH() const {
-  const FX_FLOAT* pMatrix = GetMatrix();
-  FX_FLOAT unit = FXSYS_sqrt2(pMatrix[0], pMatrix[2]);
-  FX_FLOAT size = unit * GetFontSize();
-  return (FX_FLOAT)FXSYS_fabs(size);
+  return m_Ref.GetObject()->GetFontSizeH();
 }
 
 FX_FLOAT CPDF_TextState::GetBaselineAngle() const {
-  const FX_FLOAT* m_Matrix = GetMatrix();
-  return FXSYS_atan2(m_Matrix[2], m_Matrix[0]);
+  return m_Ref.GetObject()->GetBaselineAngle();
 }
 
 FX_FLOAT CPDF_TextState::GetShearAngle() const {
-  const FX_FLOAT* m_Matrix = GetMatrix();
-  FX_FLOAT shear_angle = FXSYS_atan2(m_Matrix[1], m_Matrix[3]);
-  return GetBaselineAngle() + shear_angle;
+  return m_Ref.GetObject()->GetShearAngle();
 }
+
+TextRenderingMode CPDF_TextState::GetTextMode() const {
+  return m_Ref.GetObject()->m_TextMode;
+}
+
+void CPDF_TextState::SetTextMode(TextRenderingMode mode) {
+  m_Ref.GetPrivateCopy()->m_TextMode = mode;
+}
+
+const FX_FLOAT* CPDF_TextState::GetCTM() const {
+  return m_Ref.GetObject()->m_CTM;
+}
+
+FX_FLOAT* CPDF_TextState::GetMutableCTM() {
+  return m_Ref.GetPrivateCopy()->m_CTM;
+}