Return unique_ptrs from CFX_DIBitmap::Clone().

Because that's what clone does.  Perform immediate release
in some spots to avoid disrupting too much at once.

Review-Url: https://codereview.chromium.org/2534953004

6 files changed, 12 insertions, 29 deletions

diff --git a/core/fpdfapi/render/cpdf_imagecacheentry.cpp b/core/fpdfapi/render/cpdf_imagecacheentry.cpp
index 93ec162a7c..932d281f98 100644
--- a/core/fpdfapi/render/cpdf_imagecacheentry.cpp
+++ b/core/fpdfapi/render/cpdf_imagecacheentry.cpp
@@ -34,7 +34,7 @@ CPDF_ImageCacheEntry::~CPDF_ImageCacheEntry() {}
 void CPDF_ImageCacheEntry::Reset(const CFX_DIBitmap* pBitmap) {
   m_pCachedBitmap.reset();
   if (pBitmap)
-    m_pCachedBitmap = pdfium::WrapUnique<CFX_DIBSource>(pBitmap->Clone());
+    m_pCachedBitmap = pBitmap->Clone();
   CalcSize();
 }
 
diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index bdcd2b3c65..eae32443d8 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -94,7 +94,7 @@ bool CPDF_ImageRenderer::StartRenderDIBSource() {
           m_pImageObject->m_GeneralState.GetTransferFunc()->TranslateImage(
               m_Loader.m_pBitmap, !m_Loader.m_bCached);
       if (m_Loader.m_bCached && m_Loader.m_pMask)
-        m_Loader.m_pMask = m_Loader.m_pMask->Clone();
+        m_Loader.m_pMask = m_Loader.m_pMask->Clone().release();
       m_Loader.m_bCached = false;
     }
   }
@@ -110,7 +110,7 @@ bool CPDF_ImageRenderer::StartRenderDIBSource() {
     }
     m_FillArgb = m_pRenderStatus->GetFillArgb(m_pImageObject);
   } else if (m_pRenderStatus->m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
-    m_pClone.reset(m_pDIBSource->Clone());
+    m_pClone = m_pDIBSource->Clone();
     m_pClone->ConvertColorScale(m_pRenderStatus->m_Options.m_BackColor,
                                 m_pRenderStatus->m_Options.m_ForeColor);
     m_pDIBSource = m_pClone.get();
@@ -400,7 +400,7 @@ bool CPDF_ImageRenderer::StartDIBSource() {
     }
   }
 #ifdef _SKIA_SUPPORT_
-  CFX_DIBitmap* premultiplied = m_pDIBSource->Clone();
+  CFX_DIBitmap* premultiplied = m_pDIBSource->Clone().release();
   if (m_pDIBSource->HasAlpha())
     CFX_SkiaDeviceDriver::PreMultiply(premultiplied);
   if (m_pRenderStatus->m_pDevice->StartDIBitsWithBlend(
diff --git a/core/fpdfapi/render/cpdf_renderstatus.cpp b/core/fpdfapi/render/cpdf_renderstatus.cpp
index 126e04662e..88dbb030ce 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.cpp
+++ b/core/fpdfapi/render/cpdf_renderstatus.cpp
@@ -46,6 +46,7 @@
 #include "core/fpdfapi/render/render_int.h"
 #include "core/fpdfdoc/cpdf_occontext.h"
 #include "core/fxcodec/fx_codec.h"
+#include "core/fxcrt/cfx_maybe_owned.h"
 #include "core/fxcrt/fx_safe_types.h"
 #include "core/fxge/cfx_fxgedevice.h"
 #include "core/fxge/cfx_graphstatedata.h"
@@ -2265,7 +2266,7 @@ void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
     std::unique_ptr<CFX_DIBitmap> pEnlargedBitmap =
         DrawPatternBitmap(m_pContext->GetDocument(), m_pContext->GetPageCache(),
                           pPattern, pObj2Device, 8, 8, m_Options.m_Flags);
-    pPatternBitmap.reset(pEnlargedBitmap->StretchTo(width, height));
+    pPatternBitmap = pEnlargedBitmap->StretchTo(width, height);
   } else {
     pPatternBitmap = DrawPatternBitmap(
         m_pContext->GetDocument(), m_pContext->GetPageCache(), pPattern,
@@ -2439,10 +2440,8 @@ void CPDF_RenderStatus::CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
       FX_RECT rect(left, top, left + pDIBitmap->GetWidth(),
                    top + pDIBitmap->GetHeight());
       rect.Intersect(m_pDevice->GetClipBox());
-      CFX_DIBitmap* pClone = nullptr;
-      bool bClone = false;
+      CFX_MaybeOwned<CFX_DIBitmap> pClone;
       if (m_pDevice->GetBackDrop() && m_pDevice->GetBitmap()) {
-        bClone = true;
         pClone = m_pDevice->GetBackDrop()->Clone(&rect);
         CFX_DIBitmap* pForeBitmap = m_pDevice->GetBitmap();
         pClone->CompositeBitmap(0, 0, pClone->GetWidth(), pClone->GetHeight(),
@@ -2459,17 +2458,13 @@ void CPDF_RenderStatus::CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
         pClone = pDIBitmap;
       }
       if (m_pDevice->GetBackDrop()) {
-        m_pDevice->SetDIBits(pClone, rect.left, rect.top);
+        m_pDevice->SetDIBits(pClone.Get(), rect.left, rect.top);
       } else {
-        if (pDIBitmap->IsAlphaMask()) {
+        if (pDIBitmap->IsAlphaMask())
           return;
-        }
         m_pDevice->SetDIBitsWithBlend(pDIBitmap, rect.left, rect.top,
                                       blend_mode);
       }
-      if (bClone) {
-        delete pClone;
-      }
     }
     return;
   }
diff --git a/core/fpdfapi/render/cpdf_type3cache.cpp b/core/fpdfapi/render/cpdf_type3cache.cpp
index ba92142dbf..b27fdf507e 100644
--- a/core/fpdfapi/render/cpdf_type3cache.cpp
+++ b/core/fpdfapi/render/cpdf_type3cache.cpp
@@ -143,10 +143,10 @@ CFX_GlyphBitmap* CPDF_Type3Cache::RenderGlyph(CPDF_Type3Glyphs* pSize,
         bottom_y = temp;
       }
       pSize->AdjustBlue(top_y, bottom_y, top_line, bottom_line);
-      pResBitmap.reset(pBitmap->StretchTo(
+      pResBitmap = pBitmap->StretchTo(
           (int)(FXSYS_round(image_matrix.a) * retinaScaleX),
           (int)((bFlipped ? top_line - bottom_line : bottom_line - top_line) *
-                retinaScaleY)));
+                retinaScaleY));
       top = top_line;
       if (image_matrix.a < 0) {
         image_matrix.Scale(retinaScaleX, retinaScaleY);
@@ -158,7 +158,7 @@ CFX_GlyphBitmap* CPDF_Type3Cache::RenderGlyph(CPDF_Type3Glyphs* pSize,
   }
   if (!pResBitmap) {
     image_matrix.Scale(retinaScaleX, retinaScaleY);
-    pResBitmap.reset(pBitmap->TransformTo(&image_matrix, left, top));
+    pResBitmap = pBitmap->TransformTo(&image_matrix, left, top);
   }
   if (!pResBitmap)
     return nullptr;
diff --git a/core/fpdfapi/render/fpdf_render_loadimage.cpp b/core/fpdfapi/render/fpdf_render_loadimage.cpp
index d797b06135..f690f688b1 100644
--- a/core/fpdfapi/render/fpdf_render_loadimage.cpp
+++ b/core/fpdfapi/render/fpdf_render_loadimage.cpp
@@ -132,16 +132,6 @@ CPDF_DIBSource::~CPDF_DIBSource() {
   }
 }
 
-CFX_DIBitmap* CPDF_DIBSource::GetBitmap() const {
-  return m_pCachedBitmap ? m_pCachedBitmap.get() : Clone();
-}
-
-void CPDF_DIBSource::ReleaseBitmap(CFX_DIBitmap* pBitmap) const {
-  if (pBitmap && pBitmap != m_pCachedBitmap.get()) {
-    delete pBitmap;
-  }
-}
-
 bool CPDF_DIBSource::Load(CPDF_Document* pDoc,
                           const CPDF_Stream* pStream,
                           CPDF_DIBSource** ppMask,
diff --git a/core/fpdfapi/render/render_int.h b/core/fpdfapi/render/render_int.h
index 5d04fa77bb..276370d386 100644
--- a/core/fpdfapi/render/render_int.h
+++ b/core/fpdfapi/render/render_int.h
@@ -85,8 +85,6 @@ class CPDF_DIBSource : public CFX_DIBSource {
                           int clip_left,
                           int clip_width) const override;
 
-  CFX_DIBitmap* GetBitmap() const;
-  void ReleaseBitmap(CFX_DIBitmap* pBitmap) const;
   uint32_t GetMatteColor() const { return m_MatteColor; }
 
   int StartLoadDIBSource(CPDF_Document* pDoc,