Use smart pointers for class owned pointers in xfa/fxfa

Use smart pointers instead of raw pointer to make memory management
easier for classes mainly under xfa/fxfa.

Also change the return type of IFGAS_FontMgr::Create() to smart
pointer type.

BUG=pdfium:518

Review-Url: https://codereview.chromium.org/2227883002

1 files changed, 24 insertions, 25 deletions

diff --git a/xfa/fxfa/app/xfa_ffwidget.cpp b/xfa/fxfa/app/xfa_ffwidget.cpp
index ed42aa4825..446fcd6303 100644
--- a/xfa/fxfa/app/xfa_ffwidget.cpp
+++ b/xfa/fxfa/app/xfa_ffwidget.cpp
@@ -564,11 +564,20 @@ class CXFA_ImageRenderer {
   FX_BOOL Continue(IFX_Pause* pPause);
 
  protected:
+  FX_BOOL StartDIBSource();
+  void CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
+                         int left,
+                         int top,
+                         FX_ARGB mask_argb,
+                         int bitmap_alpha,
+                         int blend_mode,
+                         int Transparency);
+
   CFX_RenderDevice* m_pDevice;
   int m_Status;
   CFX_Matrix m_ImageMatrix;
   CFX_DIBSource* m_pDIBSource;
-  CFX_DIBitmap* m_pCloneConvert;
+  std::unique_ptr<CFX_DIBitmap> m_pCloneConvert;
   int m_BitmapAlpha;
   FX_ARGB m_FillArgb;
   uint32_t m_Flags;
@@ -577,31 +586,21 @@ class CXFA_ImageRenderer {
   int32_t m_BlendType;
   FX_BOOL m_Result;
   FX_BOOL m_bPrint;
-  FX_BOOL StartDIBSource();
-  void CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
-                         int left,
-                         int top,
-                         FX_ARGB mask_argb,
-                         int bitmap_alpha,
-                         int blend_mode,
-                         int Transparency);
 };
-CXFA_ImageRenderer::CXFA_ImageRenderer() {
-  m_pDevice = nullptr;
-  m_Status = 0;
-  m_pDIBSource = nullptr;
-  m_pCloneConvert = nullptr;
-  m_BitmapAlpha = 255;
-  m_FillArgb = 0;
-  m_Flags = 0;
-  m_DeviceHandle = nullptr;
-  m_BlendType = FXDIB_BLEND_NORMAL;
-  m_Result = TRUE;
-  m_bPrint = FALSE;
-}
+
+CXFA_ImageRenderer::CXFA_ImageRenderer()
+    : m_pDevice(nullptr),
+      m_Status(0),
+      m_pDIBSource(nullptr),
+      m_BitmapAlpha(255),
+      m_FillArgb(0),
+      m_Flags(0),
+      m_DeviceHandle(nullptr),
+      m_BlendType(FXDIB_BLEND_NORMAL),
+      m_Result(TRUE),
+      m_bPrint(FALSE) {}
 
 CXFA_ImageRenderer::~CXFA_ImageRenderer() {
-  delete m_pCloneConvert;
   if (m_DeviceHandle)
     m_pDevice->CancelDIBits(m_DeviceHandle);
 }
@@ -647,12 +646,12 @@ FX_BOOL CXFA_ImageRenderer::StartDIBSource() {
     if (m_pDIBSource->HasAlpha() &&
         !(m_pDevice->GetRenderCaps() & FXRC_ALPHA_IMAGE) &&
         !(m_pDevice->GetRenderCaps() & FXRC_GET_BITS)) {
-      m_pCloneConvert = m_pDIBSource->CloneConvert(FXDIB_Rgb);
+      m_pCloneConvert.reset(m_pDIBSource->CloneConvert(FXDIB_Rgb));
       if (!m_pCloneConvert) {
         m_Result = FALSE;
         return FALSE;
       }
-      pDib = m_pCloneConvert;
+      pDib = m_pCloneConvert.get();
     }
     FX_RECT clip_box = m_pDevice->GetClipBox();
     clip_box.Intersect(image_rect);