Remove fpdf_render.cpp

Split the remaining code into files per class.

Change-Id: Idb959dbf807223a509e16c76f9626e61856a886b
Reviewed-on: https://pdfium-review.googlesource.com/2094
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

12 files changed, 523 insertions, 453 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 87368e2b56..cb5962dce1 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -541,6 +541,8 @@ static_library("fpdfapi") {
     "core/fpdfapi/parser/fpdf_parser_utility.h",
     "core/fpdfapi/render/cpdf_charposlist.cpp",
     "core/fpdfapi/render/cpdf_charposlist.h",
+    "core/fpdfapi/render/cpdf_devicebuffer.cpp",
+    "core/fpdfapi/render/cpdf_devicebuffer.h",
     "core/fpdfapi/render/cpdf_docrenderdata.cpp",
     "core/fpdfapi/render/cpdf_docrenderdata.h",
     "core/fpdfapi/render/cpdf_imageloader.cpp",
@@ -548,11 +550,16 @@ static_library("fpdfapi") {
     "core/fpdfapi/render/cpdf_imagerenderer.cpp",
     "core/fpdfapi/render/cpdf_imagerenderer.h",
     "core/fpdfapi/render/cpdf_pagerendercache.h",
+    "core/fpdfapi/render/cpdf_progressiverenderer.cpp",
     "core/fpdfapi/render/cpdf_progressiverenderer.h",
+    "core/fpdfapi/render/cpdf_rendercontext.cpp",
     "core/fpdfapi/render/cpdf_rendercontext.h",
+    "core/fpdfapi/render/cpdf_renderoptions.cpp",
     "core/fpdfapi/render/cpdf_renderoptions.h",
     "core/fpdfapi/render/cpdf_renderstatus.cpp",
     "core/fpdfapi/render/cpdf_renderstatus.h",
+    "core/fpdfapi/render/cpdf_scaledrenderbuffer.cpp",
+    "core/fpdfapi/render/cpdf_scaledrenderbuffer.h",
     "core/fpdfapi/render/cpdf_textrenderer.h",
     "core/fpdfapi/render/cpdf_transferfunc.cpp",
     "core/fpdfapi/render/cpdf_transferfunc.h",
@@ -560,7 +567,6 @@ static_library("fpdfapi") {
     "core/fpdfapi/render/cpdf_type3cache.h",
     "core/fpdfapi/render/cpdf_type3glyphs.cpp",
     "core/fpdfapi/render/cpdf_type3glyphs.h",
-    "core/fpdfapi/render/fpdf_render.cpp",
     "core/fpdfapi/render/fpdf_render_cache.cpp",
     "core/fpdfapi/render/fpdf_render_image.cpp",
     "core/fpdfapi/render/fpdf_render_loadimage.cpp",
diff --git a/core/fpdfapi/render/cpdf_devicebuffer.cpp b/core/fpdfapi/render/cpdf_devicebuffer.cpp
new file mode 100644
index 0000000000..06b4d13c7a
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_devicebuffer.cpp
@@ -0,0 +1,75 @@
+// 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/render/cpdf_devicebuffer.h"
+
+#include "core/fpdfapi/page/cpdf_pageobject.h"
+#include "core/fpdfapi/render/cpdf_rendercontext.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fxge/cfx_fxgedevice.h"
+#include "core/fxge/cfx_renderdevice.h"
+#include "core/fxge/fx_dib.h"
+
+CPDF_DeviceBuffer::CPDF_DeviceBuffer()
+    : m_pDevice(nullptr), m_pContext(nullptr), m_pObject(nullptr) {}
+
+CPDF_DeviceBuffer::~CPDF_DeviceBuffer() {}
+
+bool CPDF_DeviceBuffer::Initialize(CPDF_RenderContext* pContext,
+                                   CFX_RenderDevice* pDevice,
+                                   FX_RECT* pRect,
+                                   const CPDF_PageObject* pObj,
+                                   int max_dpi) {
+  m_pDevice = pDevice;
+  m_pContext = pContext;
+  m_Rect = *pRect;
+  m_pObject = pObj;
+  m_Matrix.TranslateI(-pRect->left, -pRect->top);
+#if _FXM_PLATFORM_ != _FXM_PLATFORM_APPLE_
+  int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
+  int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
+  if (horz_size && vert_size && max_dpi) {
+    int dpih =
+        pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
+    int dpiv =
+        pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
+    if (dpih > max_dpi)
+      m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f);
+    if (dpiv > max_dpi)
+      m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv);
+  }
+#endif
+  CFX_Matrix ctm = m_pDevice->GetCTM();
+  FX_FLOAT fScaleX = FXSYS_fabs(ctm.a);
+  FX_FLOAT fScaleY = FXSYS_fabs(ctm.d);
+  m_Matrix.Concat(fScaleX, 0, 0, fScaleY, 0, 0);
+  CFX_FloatRect rect(*pRect);
+  m_Matrix.TransformRect(rect);
+  FX_RECT bitmap_rect = rect.GetOuterRect();
+  m_pBitmap.reset(new CFX_DIBitmap);
+  m_pBitmap->Create(bitmap_rect.Width(), bitmap_rect.Height(), FXDIB_Argb);
+  return true;
+}
+
+void CPDF_DeviceBuffer::OutputToDevice() {
+  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
+    if (m_Matrix.a == 1.0f && m_Matrix.d == 1.0f) {
+      m_pDevice->SetDIBits(m_pBitmap.get(), m_Rect.left, m_Rect.top);
+    } else {
+      m_pDevice->StretchDIBits(m_pBitmap.get(), m_Rect.left, m_Rect.top,
+                               m_Rect.Width(), m_Rect.Height());
+    }
+    return;
+  }
+  CFX_DIBitmap buffer;
+  m_pDevice->CreateCompatibleBitmap(&buffer, m_pBitmap->GetWidth(),
+                                    m_pBitmap->GetHeight());
+  m_pContext->GetBackground(&buffer, m_pObject, nullptr, &m_Matrix);
+  buffer.CompositeBitmap(0, 0, buffer.GetWidth(), buffer.GetHeight(),
+                         m_pBitmap.get(), 0, 0);
+  m_pDevice->StretchDIBits(&buffer, m_Rect.left, m_Rect.top, m_Rect.Width(),
+                           m_Rect.Height());
+}
diff --git a/core/fpdfapi/render/cpdf_devicebuffer.h b/core/fpdfapi/render/cpdf_devicebuffer.h
new file mode 100644
index 0000000000..e5bbf1fcdf
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_devicebuffer.h
@@ -0,0 +1,41 @@
+// 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
+
+#ifndef CORE_FPDFAPI_RENDER_CPDF_DEVICEBUFFER_H_
+#define CORE_FPDFAPI_RENDER_CPDF_DEVICEBUFFER_H_
+
+#include <memory>
+
+#include "core/fxcrt/fx_coordinates.h"
+
+class CFX_DIBitmap;
+class CFX_RenderDevice;
+class CPDF_PageObject;
+class CPDF_RenderContext;
+
+class CPDF_DeviceBuffer {
+ public:
+  CPDF_DeviceBuffer();
+  ~CPDF_DeviceBuffer();
+  bool Initialize(CPDF_RenderContext* pContext,
+                  CFX_RenderDevice* pDevice,
+                  FX_RECT* pRect,
+                  const CPDF_PageObject* pObj,
+                  int max_dpi);
+  void OutputToDevice();
+  CFX_DIBitmap* GetBitmap() const { return m_pBitmap.get(); }
+  const CFX_Matrix* GetMatrix() const { return &m_Matrix; }
+
+ private:
+  CFX_RenderDevice* m_pDevice;
+  CPDF_RenderContext* m_pContext;
+  FX_RECT m_Rect;
+  const CPDF_PageObject* m_pObject;
+  std::unique_ptr<CFX_DIBitmap> m_pBitmap;
+  CFX_Matrix m_Matrix;
+};
+
+#endif  // CORE_FPDFAPI_RENDER_CPDF_DEVICEBUFFER_H_
diff --git a/core/fpdfapi/render/cpdf_progressiverenderer.cpp b/core/fpdfapi/render/cpdf_progressiverenderer.cpp
new file mode 100644
index 0000000000..46d78b6c4e
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_progressiverenderer.cpp
@@ -0,0 +1,113 @@
+// 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/render/cpdf_progressiverenderer.h"
+
+#include "core/fpdfapi/page/cpdf_pageobject.h"
+#include "core/fpdfapi/page/cpdf_pageobjectholder.h"
+#include "core/fpdfapi/render/cpdf_pagerendercache.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fpdfapi/render/cpdf_renderstatus.h"
+#include "core/fxge/cfx_renderdevice.h"
+
+CPDF_ProgressiveRenderer::CPDF_ProgressiveRenderer(
+    CPDF_RenderContext* pContext,
+    CFX_RenderDevice* pDevice,
+    const CPDF_RenderOptions* pOptions)
+    : m_Status(Ready),
+      m_pContext(pContext),
+      m_pDevice(pDevice),
+      m_pOptions(pOptions),
+      m_LayerIndex(0),
+      m_pCurrentLayer(nullptr) {}
+
+CPDF_ProgressiveRenderer::~CPDF_ProgressiveRenderer() {
+  if (m_pRenderStatus)
+    m_pDevice->RestoreState(false);
+}
+
+void CPDF_ProgressiveRenderer::Start(IFX_Pause* pPause) {
+  if (!m_pContext || !m_pDevice || m_Status != Ready) {
+    m_Status = Failed;
+    return;
+  }
+  m_Status = ToBeContinued;
+  Continue(pPause);
+}
+
+void CPDF_ProgressiveRenderer::Continue(IFX_Pause* pPause) {
+  while (m_Status == ToBeContinued) {
+    if (!m_pCurrentLayer) {
+      if (m_LayerIndex >= m_pContext->CountLayers()) {
+        m_Status = Done;
+        return;
+      }
+      m_pCurrentLayer = m_pContext->GetLayer(m_LayerIndex);
+      m_LastObjectRendered =
+          m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
+      m_pRenderStatus.reset(new CPDF_RenderStatus());
+      m_pRenderStatus->Initialize(
+          m_pContext, m_pDevice, nullptr, nullptr, nullptr, nullptr, m_pOptions,
+          m_pCurrentLayer->m_pObjectHolder->m_Transparency, false, nullptr);
+      m_pDevice->SaveState();
+      m_ClipRect = CFX_FloatRect(m_pDevice->GetClipBox());
+      CFX_Matrix device2object;
+      device2object.SetReverse(m_pCurrentLayer->m_Matrix);
+      device2object.TransformRect(m_ClipRect);
+    }
+    CPDF_PageObjectList::iterator iter;
+    CPDF_PageObjectList::iterator iterEnd =
+        m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
+    if (m_LastObjectRendered != iterEnd) {
+      iter = m_LastObjectRendered;
+      ++iter;
+    } else {
+      iter = m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->begin();
+    }
+    int nObjsToGo = kStepLimit;
+    while (iter != iterEnd) {
+      CPDF_PageObject* pCurObj = iter->get();
+      if (pCurObj && pCurObj->m_Left <= m_ClipRect.right &&
+          pCurObj->m_Right >= m_ClipRect.left &&
+          pCurObj->m_Bottom <= m_ClipRect.top &&
+          pCurObj->m_Top >= m_ClipRect.bottom) {
+        if (m_pRenderStatus->ContinueSingleObject(
+                pCurObj, &m_pCurrentLayer->m_Matrix, pPause)) {
+          return;
+        }
+        if (pCurObj->IsImage() &&
+            m_pRenderStatus->m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE) {
+          m_pContext->GetPageCache()->CacheOptimization(
+              m_pRenderStatus->m_Options.m_dwLimitCacheSize);
+        }
+        if (pCurObj->IsForm() || pCurObj->IsShading())
+          nObjsToGo = 0;
+        else
+          --nObjsToGo;
+      }
+      m_LastObjectRendered = iter;
+      if (nObjsToGo == 0) {
+        if (pPause && pPause->NeedToPauseNow())
+          return;
+        nObjsToGo = kStepLimit;
+      }
+      ++iter;
+    }
+    if (m_pCurrentLayer->m_pObjectHolder->IsParsed()) {
+      m_pRenderStatus.reset();
+      m_pDevice->RestoreState(false);
+      m_pCurrentLayer = nullptr;
+      m_LayerIndex++;
+      if (pPause && pPause->NeedToPauseNow()) {
+        return;
+      }
+    } else {
+      m_pCurrentLayer->m_pObjectHolder->ContinueParse(pPause);
+      if (!m_pCurrentLayer->m_pObjectHolder->IsParsed())
+        return;
+    }
+  }
+}
diff --git a/core/fpdfapi/render/cpdf_progressiverenderer.h b/core/fpdfapi/render/cpdf_progressiverenderer.h
index 2cf84e97f3..f0b1579601 100644
--- a/core/fpdfapi/render/cpdf_progressiverenderer.h
+++ b/core/fpdfapi/render/cpdf_progressiverenderer.h
@@ -43,8 +43,6 @@ class CPDF_ProgressiveRenderer {
   void Continue(IFX_Pause* pPause);
 
  private:
-  void RenderStep();
-
   // Maximum page objects to render before checking for pause.
   static const int kStepLimit = 100;
 
diff --git a/core/fpdfapi/render/cpdf_rendercontext.cpp b/core/fpdfapi/render/cpdf_rendercontext.cpp
new file mode 100644
index 0000000000..2efdb81f8a
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_rendercontext.cpp
@@ -0,0 +1,98 @@
+// 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/render/cpdf_rendercontext.h"
+
+#include "core/fpdfapi/page/cpdf_page.h"
+#include "core/fpdfapi/page/cpdf_pageobject.h"
+#include "core/fpdfapi/page/cpdf_pageobjectholder.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/render/cpdf_pagerendercache.h"
+#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fpdfapi/render/cpdf_renderstatus.h"
+#include "core/fpdfapi/render/cpdf_textrenderer.h"
+#include "core/fxge/cfx_renderdevice.h"
+#include "core/fxge/fx_dib.h"
+
+CPDF_RenderContext::CPDF_RenderContext(CPDF_Page* pPage)
+    : m_pDocument(pPage->m_pDocument),
+      m_pPageResources(pPage->m_pPageResources),
+      m_pPageCache(pPage->GetRenderCache()) {}
+
+CPDF_RenderContext::CPDF_RenderContext(CPDF_Document* pDoc,
+                                       CPDF_PageRenderCache* pPageCache)
+    : m_pDocument(pDoc), m_pPageResources(nullptr), m_pPageCache(pPageCache) {}
+
+CPDF_RenderContext::~CPDF_RenderContext() {}
+
+void CPDF_RenderContext::GetBackground(CFX_DIBitmap* pBuffer,
+                                       const CPDF_PageObject* pObj,
+                                       const CPDF_RenderOptions* pOptions,
+                                       CFX_Matrix* pFinalMatrix) {
+  CFX_FxgeDevice device;
+  device.Attach(pBuffer, false, nullptr, false);
+
+  FX_RECT rect(0, 0, device.GetWidth(), device.GetHeight());
+  device.FillRect(&rect, 0xffffffff);
+  Render(&device, pObj, pOptions, pFinalMatrix);
+}
+
+void CPDF_RenderContext::AppendLayer(CPDF_PageObjectHolder* pObjectHolder,
+                                     const CFX_Matrix* pObject2Device) {
+  Layer* pLayer = m_Layers.AddSpace();
+  pLayer->m_pObjectHolder = pObjectHolder;
+  if (pObject2Device)
+    pLayer->m_Matrix = *pObject2Device;
+  else
+    pLayer->m_Matrix.SetIdentity();
+}
+
+void CPDF_RenderContext::Render(CFX_RenderDevice* pDevice,
+                                const CPDF_RenderOptions* pOptions,
+                                const CFX_Matrix* pLastMatrix) {
+  Render(pDevice, nullptr, pOptions, pLastMatrix);
+}
+
+void CPDF_RenderContext::Render(CFX_RenderDevice* pDevice,
+                                const CPDF_PageObject* pStopObj,
+                                const CPDF_RenderOptions* pOptions,
+                                const CFX_Matrix* pLastMatrix) {
+  int count = m_Layers.GetSize();
+  for (int j = 0; j < count; j++) {
+    pDevice->SaveState();
+    Layer* pLayer = m_Layers.GetDataPtr(j);
+    if (pLastMatrix) {
+      CFX_Matrix FinalMatrix = pLayer->m_Matrix;
+      FinalMatrix.Concat(*pLastMatrix);
+      CPDF_RenderStatus status;
+      status.Initialize(this, pDevice, pLastMatrix, pStopObj, nullptr, nullptr,
+                        pOptions, pLayer->m_pObjectHolder->m_Transparency,
+                        false, nullptr);
+      status.RenderObjectList(pLayer->m_pObjectHolder, &FinalMatrix);
+      if (status.m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE)
+        m_pPageCache->CacheOptimization(status.m_Options.m_dwLimitCacheSize);
+      if (status.m_bStopped) {
+        pDevice->RestoreState(false);
+        break;
+      }
+    } else {
+      CPDF_RenderStatus status;
+      status.Initialize(this, pDevice, nullptr, pStopObj, nullptr, nullptr,
+                        pOptions, pLayer->m_pObjectHolder->m_Transparency,
+                        false, nullptr);
+      status.RenderObjectList(pLayer->m_pObjectHolder, &pLayer->m_Matrix);
+      if (status.m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE)
+        m_pPageCache->CacheOptimization(status.m_Options.m_dwLimitCacheSize);
+      if (status.m_bStopped) {
+        pDevice->RestoreState(false);
+        break;
+      }
+    }
+    pDevice->RestoreState(false);
+  }
+}
diff --git a/core/fpdfapi/render/cpdf_renderoptions.cpp b/core/fpdfapi/render/cpdf_renderoptions.cpp
new file mode 100644
index 0000000000..ea11d7f5ee
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_renderoptions.cpp
@@ -0,0 +1,62 @@
+// 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/render/cpdf_renderoptions.h"
+
+CPDF_RenderOptions::CPDF_RenderOptions()
+    : m_ColorMode(RENDER_COLOR_NORMAL),
+      m_Flags(RENDER_CLEARTYPE),
+      m_Interpolation(0),
+      m_AddFlags(0),
+      m_pOCContext(nullptr),
+      m_dwLimitCacheSize(1024 * 1024 * 100),
+      m_HalftoneLimit(-1),
+      m_bDrawAnnots(false) {}
+
+CPDF_RenderOptions::CPDF_RenderOptions(const CPDF_RenderOptions& rhs)
+    : m_ColorMode(rhs.m_ColorMode),
+      m_BackColor(rhs.m_BackColor),
+      m_ForeColor(rhs.m_ForeColor),
+      m_Flags(rhs.m_Flags),
+      m_Interpolation(rhs.m_Interpolation),
+      m_AddFlags(rhs.m_AddFlags),
+      m_pOCContext(rhs.m_pOCContext),
+      m_dwLimitCacheSize(rhs.m_dwLimitCacheSize),
+      m_HalftoneLimit(rhs.m_HalftoneLimit),
+      m_bDrawAnnots(rhs.m_bDrawAnnots) {}
+
+FX_ARGB CPDF_RenderOptions::TranslateColor(FX_ARGB argb) const {
+  if (m_ColorMode == RENDER_COLOR_NORMAL)
+    return argb;
+
+  if (m_ColorMode == RENDER_COLOR_ALPHA)
+    return argb;
+
+  int a, r, g, b;
+  ArgbDecode(argb, a, r, g, b);
+  int gray = FXRGB2GRAY(r, g, b);
+  if (m_ColorMode == RENDER_COLOR_TWOCOLOR) {
+    int color = (r - gray) * (r - gray) + (g - gray) * (g - gray) +
+                (b - gray) * (b - gray);
+    if (gray < 35 && color < 20)
+      return ArgbEncode(a, m_ForeColor);
+
+    if (gray > 221 && color < 20)
+      return ArgbEncode(a, m_BackColor);
+
+    return argb;
+  }
+  int fr = FXSYS_GetRValue(m_ForeColor);
+  int fg = FXSYS_GetGValue(m_ForeColor);
+  int fb = FXSYS_GetBValue(m_ForeColor);
+  int br = FXSYS_GetRValue(m_BackColor);
+  int bg = FXSYS_GetGValue(m_BackColor);
+  int bb = FXSYS_GetBValue(m_BackColor);
+  r = (br - fr) * gray / 255 + fr;
+  g = (bg - fg) * gray / 255 + fg;
+  b = (bb - fb) * gray / 255 + fb;
+  return ArgbEncode(a, r, g, b);
+}
diff --git a/core/fpdfapi/render/cpdf_renderstatus.cpp b/core/fpdfapi/render/cpdf_renderstatus.cpp
index efad9db4c4..126e04662e 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.cpp
+++ b/core/fpdfapi/render/cpdf_renderstatus.cpp
@@ -33,11 +33,13 @@
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
 #include "core/fpdfapi/render/cpdf_charposlist.h"
+#include "core/fpdfapi/render/cpdf_devicebuffer.h"
 #include "core/fpdfapi/render/cpdf_docrenderdata.h"
 #include "core/fpdfapi/render/cpdf_imagerenderer.h"
 #include "core/fpdfapi/render/cpdf_pagerendercache.h"
 #include "core/fpdfapi/render/cpdf_rendercontext.h"
 #include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fpdfapi/render/cpdf_scaledrenderbuffer.h"
 #include "core/fpdfapi/render/cpdf_textrenderer.h"
 #include "core/fpdfapi/render/cpdf_transferfunc.h"
 #include "core/fpdfapi/render/cpdf_type3cache.h"
diff --git a/core/fpdfapi/render/cpdf_scaledrenderbuffer.cpp b/core/fpdfapi/render/cpdf_scaledrenderbuffer.cpp
new file mode 100644
index 0000000000..a14bb9ea43
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_scaledrenderbuffer.cpp
@@ -0,0 +1,79 @@
+// 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/render/cpdf_scaledrenderbuffer.h"
+
+#include "core/fpdfapi/render/cpdf_rendercontext.h"
+#include "core/fpdfapi/render/cpdf_renderoptions.h"
+#include "core/fxge/cfx_fxgedevice.h"
+#include "core/fxge/cfx_renderdevice.h"
+
+#define _FPDFAPI_IMAGESIZE_LIMIT_ (30 * 1024 * 1024)
+
+CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {}
+
+CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {}
+
+bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
+                                         CFX_RenderDevice* pDevice,
+                                         const FX_RECT& pRect,
+                                         const CPDF_PageObject* pObj,
+                                         const CPDF_RenderOptions* pOptions,
+                                         int max_dpi) {
+  m_pDevice = pDevice;
+  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS)
+    return true;
+
+  m_pContext = pContext;
+  m_Rect = pRect;
+  m_pObject = pObj;
+  m_Matrix.TranslateI(-pRect.left, -pRect.top);
+  int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
+  int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
+  if (horz_size && vert_size && max_dpi) {
+    int dpih =
+        pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
+    int dpiv =
+        pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
+    if (dpih > max_dpi)
+      m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f);
+    if (dpiv > max_dpi)
+      m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv);
+  }
+  m_pBitmapDevice.reset(new CFX_FxgeDevice);
+  FXDIB_Format dibFormat = FXDIB_Rgb;
+  int32_t bpp = 24;
+  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT) {
+    dibFormat = FXDIB_Argb;
+    bpp = 32;
+  }
+  while (1) {
+    CFX_FloatRect rect(pRect);
+    m_Matrix.TransformRect(rect);
+    FX_RECT bitmap_rect = rect.GetOuterRect();
+    int32_t iWidth = bitmap_rect.Width();
+    int32_t iHeight = bitmap_rect.Height();
+    int32_t iPitch = (iWidth * bpp + 31) / 32 * 4;
+    if (iWidth * iHeight < 1)
+      return false;
+
+    if (iPitch * iHeight <= _FPDFAPI_IMAGESIZE_LIMIT_ &&
+        m_pBitmapDevice->Create(iWidth, iHeight, dibFormat, nullptr)) {
+      break;
+    }
+    m_Matrix.Scale(0.5f, 0.5f);
+  }
+  m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject, pOptions,
+                            &m_Matrix);
+  return true;
+}
+
+void CPDF_ScaledRenderBuffer::OutputToDevice() {
+  if (m_pBitmapDevice) {
+    m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
+                             m_Rect.top, m_Rect.Width(), m_Rect.Height());
+  }
+}
diff --git a/core/fpdfapi/render/cpdf_scaledrenderbuffer.h b/core/fpdfapi/render/cpdf_scaledrenderbuffer.h
new file mode 100644
index 0000000000..f802349dcb
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_scaledrenderbuffer.h
@@ -0,0 +1,46 @@
+// 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
+
+#ifndef CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_
+#define CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_
+
+#include <memory>
+
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxge/cfx_fxgedevice.h"
+
+class CFX_RenderDevice;
+class CPDF_PageObject;
+class CPDF_RenderContext;
+class CPDF_RenderOptions;
+
+class CPDF_ScaledRenderBuffer {
+ public:
+  CPDF_ScaledRenderBuffer();
+  ~CPDF_ScaledRenderBuffer();
+
+  bool Initialize(CPDF_RenderContext* pContext,
+                  CFX_RenderDevice* pDevice,
+                  const FX_RECT& pRect,
+                  const CPDF_PageObject* pObj,
+                  const CPDF_RenderOptions* pOptions,
+                  int max_dpi);
+  CFX_RenderDevice* GetDevice() {
+    return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice;
+  }
+  CFX_Matrix* GetMatrix() { return &m_Matrix; }
+  void OutputToDevice();
+
+ private:
+  CFX_RenderDevice* m_pDevice;
+  CPDF_RenderContext* m_pContext;
+  FX_RECT m_Rect;
+  const CPDF_PageObject* m_pObject;
+  std::unique_ptr<CFX_FxgeDevice> m_pBitmapDevice;
+  CFX_Matrix m_Matrix;
+};
+
+#endif  // CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_
diff --git a/core/fpdfapi/render/fpdf_render.cpp b/core/fpdfapi/render/fpdf_render.cpp
deleted file mode 100644
index ba5d836e95..0000000000
--- a/core/fpdfapi/render/fpdf_render.cpp
+++ /dev/null
@@ -1,402 +0,0 @@
-// Copyright 2014 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/render/render_int.h"
-
-#include <memory>
-
-#include "core/fpdfapi/cpdf_modulemgr.h"
-#include "core/fpdfapi/font/cpdf_type3char.h"
-#include "core/fpdfapi/font/cpdf_type3font.h"
-#include "core/fpdfapi/page/cpdf_docpagedata.h"
-#include "core/fpdfapi/page/cpdf_form.h"
-#include "core/fpdfapi/page/cpdf_formobject.h"
-#include "core/fpdfapi/page/cpdf_graphicstates.h"
-#include "core/fpdfapi/page/cpdf_image.h"
-#include "core/fpdfapi/page/cpdf_imageobject.h"
-#include "core/fpdfapi/page/cpdf_page.h"
-#include "core/fpdfapi/page/cpdf_pageobject.h"
-#include "core/fpdfapi/page/cpdf_pathobject.h"
-#include "core/fpdfapi/page/cpdf_textobject.h"
-#include "core/fpdfapi/page/pageint.h"
-#include "core/fpdfapi/parser/cpdf_array.h"
-#include "core/fpdfapi/parser/cpdf_dictionary.h"
-#include "core/fpdfapi/parser/cpdf_document.h"
-#include "core/fpdfapi/render/cpdf_docrenderdata.h"
-#include "core/fpdfapi/render/cpdf_pagerendercache.h"
-#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
-#include "core/fpdfapi/render/cpdf_renderoptions.h"
-#include "core/fpdfapi/render/cpdf_renderstatus.h"
-#include "core/fpdfapi/render/cpdf_textrenderer.h"
-#include "core/fpdfapi/render/cpdf_type3cache.h"
-#include "core/fpdfdoc/cpdf_occontext.h"
-#include "core/fxge/cfx_fxgedevice.h"
-#include "core/fxge/cfx_graphstatedata.h"
-#include "core/fxge/cfx_pathdata.h"
-#include "core/fxge/cfx_renderdevice.h"
-
-CPDF_RenderOptions::CPDF_RenderOptions()
-    : m_ColorMode(RENDER_COLOR_NORMAL),
-      m_Flags(RENDER_CLEARTYPE),
-      m_Interpolation(0),
-      m_AddFlags(0),
-      m_pOCContext(nullptr),
-      m_dwLimitCacheSize(1024 * 1024 * 100),
-      m_HalftoneLimit(-1),
-      m_bDrawAnnots(false) {}
-
-CPDF_RenderOptions::CPDF_RenderOptions(const CPDF_RenderOptions& rhs)
-    : m_ColorMode(rhs.m_ColorMode),
-      m_BackColor(rhs.m_BackColor),
-      m_ForeColor(rhs.m_ForeColor),
-      m_Flags(rhs.m_Flags),
-      m_Interpolation(rhs.m_Interpolation),
-      m_AddFlags(rhs.m_AddFlags),
-      m_pOCContext(rhs.m_pOCContext),
-      m_dwLimitCacheSize(rhs.m_dwLimitCacheSize),
-      m_HalftoneLimit(rhs.m_HalftoneLimit),
-      m_bDrawAnnots(rhs.m_bDrawAnnots) {}
-
-FX_ARGB CPDF_RenderOptions::TranslateColor(FX_ARGB argb) const {
-  if (m_ColorMode == RENDER_COLOR_NORMAL) {
-    return argb;
-  }
-  if (m_ColorMode == RENDER_COLOR_ALPHA) {
-    return argb;
-  }
-  int a, r, g, b;
-  ArgbDecode(argb, a, r, g, b);
-  int gray = FXRGB2GRAY(r, g, b);
-  if (m_ColorMode == RENDER_COLOR_TWOCOLOR) {
-    int color = (r - gray) * (r - gray) + (g - gray) * (g - gray) +
-                (b - gray) * (b - gray);
-    if (gray < 35 && color < 20) {
-      return ArgbEncode(a, m_ForeColor);
-    }
-    if (gray > 221 && color < 20) {
-      return ArgbEncode(a, m_BackColor);
-    }
-    return argb;
-  }
-  int fr = FXSYS_GetRValue(m_ForeColor);
-  int fg = FXSYS_GetGValue(m_ForeColor);
-  int fb = FXSYS_GetBValue(m_ForeColor);
-  int br = FXSYS_GetRValue(m_BackColor);
-  int bg = FXSYS_GetGValue(m_BackColor);
-  int bb = FXSYS_GetBValue(m_BackColor);
-  r = (br - fr) * gray / 255 + fr;
-  g = (bg - fg) * gray / 255 + fg;
-  b = (bb - fb) * gray / 255 + fb;
-  return ArgbEncode(a, r, g, b);
-}
-
-void CPDF_RenderContext::GetBackground(CFX_DIBitmap* pBuffer,
-                                       const CPDF_PageObject* pObj,
-                                       const CPDF_RenderOptions* pOptions,
-                                       CFX_Matrix* pFinalMatrix) {
-  CFX_FxgeDevice device;
-  device.Attach(pBuffer, false, nullptr, false);
-
-  FX_RECT rect(0, 0, device.GetWidth(), device.GetHeight());
-  device.FillRect(&rect, 0xffffffff);
-  Render(&device, pObj, pOptions, pFinalMatrix);
-}
-
-CPDF_RenderContext::CPDF_RenderContext(CPDF_Page* pPage)
-    : m_pDocument(pPage->m_pDocument),
-      m_pPageResources(pPage->m_pPageResources),
-      m_pPageCache(pPage->GetRenderCache()) {}
-
-CPDF_RenderContext::CPDF_RenderContext(CPDF_Document* pDoc,
-                                       CPDF_PageRenderCache* pPageCache)
-    : m_pDocument(pDoc), m_pPageResources(nullptr), m_pPageCache(pPageCache) {}
-
-CPDF_RenderContext::~CPDF_RenderContext() {}
-
-void CPDF_RenderContext::AppendLayer(CPDF_PageObjectHolder* pObjectHolder,
-                                     const CFX_Matrix* pObject2Device) {
-  Layer* pLayer = m_Layers.AddSpace();
-  pLayer->m_pObjectHolder = pObjectHolder;
-  if (pObject2Device) {
-    pLayer->m_Matrix = *pObject2Device;
-  } else {
-    pLayer->m_Matrix.SetIdentity();
-  }
-}
-void CPDF_RenderContext::Render(CFX_RenderDevice* pDevice,
-                                const CPDF_RenderOptions* pOptions,
-                                const CFX_Matrix* pLastMatrix) {
-  Render(pDevice, nullptr, pOptions, pLastMatrix);
-}
-void CPDF_RenderContext::Render(CFX_RenderDevice* pDevice,
-                                const CPDF_PageObject* pStopObj,
-                                const CPDF_RenderOptions* pOptions,
-                                const CFX_Matrix* pLastMatrix) {
-  int count = m_Layers.GetSize();
-  for (int j = 0; j < count; j++) {
-    pDevice->SaveState();
-    Layer* pLayer = m_Layers.GetDataPtr(j);
-    if (pLastMatrix) {
-      CFX_Matrix FinalMatrix = pLayer->m_Matrix;
-      FinalMatrix.Concat(*pLastMatrix);
-      CPDF_RenderStatus status;
-      status.Initialize(this, pDevice, pLastMatrix, pStopObj, nullptr, nullptr,
-                        pOptions, pLayer->m_pObjectHolder->m_Transparency,
-                        false, nullptr);
-      status.RenderObjectList(pLayer->m_pObjectHolder, &FinalMatrix);
-      if (status.m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE) {
-        m_pPageCache->CacheOptimization(status.m_Options.m_dwLimitCacheSize);
-      }
-      if (status.m_bStopped) {
-        pDevice->RestoreState(false);
-        break;
-      }
-    } else {
-      CPDF_RenderStatus status;
-      status.Initialize(this, pDevice, nullptr, pStopObj, nullptr, nullptr,
-                        pOptions, pLayer->m_pObjectHolder->m_Transparency,
-                        false, nullptr);
-      status.RenderObjectList(pLayer->m_pObjectHolder, &pLayer->m_Matrix);
-      if (status.m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE) {
-        m_pPageCache->CacheOptimization(status.m_Options.m_dwLimitCacheSize);
-      }
-      if (status.m_bStopped) {
-        pDevice->RestoreState(false);
-        break;
-      }
-    }
-    pDevice->RestoreState(false);
-  }
-}
-
-CPDF_ProgressiveRenderer::CPDF_ProgressiveRenderer(
-    CPDF_RenderContext* pContext,
-    CFX_RenderDevice* pDevice,
-    const CPDF_RenderOptions* pOptions)
-    : m_Status(Ready),
-      m_pContext(pContext),
-      m_pDevice(pDevice),
-      m_pOptions(pOptions),
-      m_LayerIndex(0),
-      m_pCurrentLayer(nullptr) {}
-
-CPDF_ProgressiveRenderer::~CPDF_ProgressiveRenderer() {
-  if (m_pRenderStatus)
-    m_pDevice->RestoreState(false);
-}
-
-void CPDF_ProgressiveRenderer::Start(IFX_Pause* pPause) {
-  if (!m_pContext || !m_pDevice || m_Status != Ready) {
-    m_Status = Failed;
-    return;
-  }
-  m_Status = ToBeContinued;
-  Continue(pPause);
-}
-
-void CPDF_ProgressiveRenderer::Continue(IFX_Pause* pPause) {
-  while (m_Status == ToBeContinued) {
-    if (!m_pCurrentLayer) {
-      if (m_LayerIndex >= m_pContext->CountLayers()) {
-        m_Status = Done;
-        return;
-      }
-      m_pCurrentLayer = m_pContext->GetLayer(m_LayerIndex);
-      m_LastObjectRendered =
-          m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
-      m_pRenderStatus.reset(new CPDF_RenderStatus());
-      m_pRenderStatus->Initialize(
-          m_pContext, m_pDevice, nullptr, nullptr, nullptr, nullptr, m_pOptions,
-          m_pCurrentLayer->m_pObjectHolder->m_Transparency, false, nullptr);
-      m_pDevice->SaveState();
-      m_ClipRect = CFX_FloatRect(m_pDevice->GetClipBox());
-      CFX_Matrix device2object;
-      device2object.SetReverse(m_pCurrentLayer->m_Matrix);
-      device2object.TransformRect(m_ClipRect);
-    }
-    CPDF_PageObjectList::iterator iter;
-    CPDF_PageObjectList::iterator iterEnd =
-        m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
-    if (m_LastObjectRendered != iterEnd) {
-      iter = m_LastObjectRendered;
-      ++iter;
-    } else {
-      iter = m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->begin();
-    }
-    int nObjsToGo = kStepLimit;
-    while (iter != iterEnd) {
-      CPDF_PageObject* pCurObj = iter->get();
-      if (pCurObj && pCurObj->m_Left <= m_ClipRect.right &&
-          pCurObj->m_Right >= m_ClipRect.left &&
-          pCurObj->m_Bottom <= m_ClipRect.top &&
-          pCurObj->m_Top >= m_ClipRect.bottom) {
-        if (m_pRenderStatus->ContinueSingleObject(
-                pCurObj, &m_pCurrentLayer->m_Matrix, pPause)) {
-          return;
-        }
-        if (pCurObj->IsImage() &&
-            m_pRenderStatus->m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE) {
-          m_pContext->GetPageCache()->CacheOptimization(
-              m_pRenderStatus->m_Options.m_dwLimitCacheSize);
-        }
-        if (pCurObj->IsForm() || pCurObj->IsShading()) {
-          nObjsToGo = 0;
-        } else {
-          --nObjsToGo;
-        }
-      }
-      m_LastObjectRendered = iter;
-      if (nObjsToGo == 0) {
-        if (pPause && pPause->NeedToPauseNow())
-          return;
-        nObjsToGo = kStepLimit;
-      }
-      ++iter;
-    }
-    if (m_pCurrentLayer->m_pObjectHolder->IsParsed()) {
-      m_pRenderStatus.reset();
-      m_pDevice->RestoreState(false);
-      m_pCurrentLayer = nullptr;
-      m_LayerIndex++;
-      if (pPause && pPause->NeedToPauseNow()) {
-        return;
-      }
-    } else {
-      m_pCurrentLayer->m_pObjectHolder->ContinueParse(pPause);
-      if (!m_pCurrentLayer->m_pObjectHolder->IsParsed())
-        return;
-    }
-  }
-}
-
-CPDF_DeviceBuffer::CPDF_DeviceBuffer()
-    : m_pDevice(nullptr), m_pContext(nullptr), m_pObject(nullptr) {}
-
-CPDF_DeviceBuffer::~CPDF_DeviceBuffer() {}
-
-bool CPDF_DeviceBuffer::Initialize(CPDF_RenderContext* pContext,
-                                   CFX_RenderDevice* pDevice,
-                                   FX_RECT* pRect,
-                                   const CPDF_PageObject* pObj,
-                                   int max_dpi) {
-  m_pDevice = pDevice;
-  m_pContext = pContext;
-  m_Rect = *pRect;
-  m_pObject = pObj;
-  m_Matrix.TranslateI(-pRect->left, -pRect->top);
-#if _FXM_PLATFORM_ != _FXM_PLATFORM_APPLE_
-  int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
-  int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
-  if (horz_size && vert_size && max_dpi) {
-    int dpih =
-        pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
-    int dpiv =
-        pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
-    if (dpih > max_dpi) {
-      m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f);
-    }
-    if (dpiv > max_dpi) {
-      m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv);
-    }
-  }
-#endif
-  CFX_Matrix ctm = m_pDevice->GetCTM();
-  FX_FLOAT fScaleX = FXSYS_fabs(ctm.a);
-  FX_FLOAT fScaleY = FXSYS_fabs(ctm.d);
-  m_Matrix.Concat(fScaleX, 0, 0, fScaleY, 0, 0);
-  CFX_FloatRect rect(*pRect);
-  m_Matrix.TransformRect(rect);
-  FX_RECT bitmap_rect = rect.GetOuterRect();
-  m_pBitmap.reset(new CFX_DIBitmap);
-  m_pBitmap->Create(bitmap_rect.Width(), bitmap_rect.Height(), FXDIB_Argb);
-  return true;
-}
-void CPDF_DeviceBuffer::OutputToDevice() {
-  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
-    if (m_Matrix.a == 1.0f && m_Matrix.d == 1.0f) {
-      m_pDevice->SetDIBits(m_pBitmap.get(), m_Rect.left, m_Rect.top);
-    } else {
-      m_pDevice->StretchDIBits(m_pBitmap.get(), m_Rect.left, m_Rect.top,
-                               m_Rect.Width(), m_Rect.Height());
-    }
-  } else {
-    CFX_DIBitmap buffer;
-    m_pDevice->CreateCompatibleBitmap(&buffer, m_pBitmap->GetWidth(),
-                                      m_pBitmap->GetHeight());
-    m_pContext->GetBackground(&buffer, m_pObject, nullptr, &m_Matrix);
-    buffer.CompositeBitmap(0, 0, buffer.GetWidth(), buffer.GetHeight(),
-                           m_pBitmap.get(), 0, 0);
-    m_pDevice->StretchDIBits(&buffer, m_Rect.left, m_Rect.top, m_Rect.Width(),
-                             m_Rect.Height());
-  }
-}
-
-CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {}
-
-CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {}
-
-#define _FPDFAPI_IMAGESIZE_LIMIT_ (30 * 1024 * 1024)
-bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
-                                         CFX_RenderDevice* pDevice,
-                                         const FX_RECT& pRect,
-                                         const CPDF_PageObject* pObj,
-                                         const CPDF_RenderOptions* pOptions,
-                                         int max_dpi) {
-  m_pDevice = pDevice;
-  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
-    return true;
-  }
-  m_pContext = pContext;
-  m_Rect = pRect;
-  m_pObject = pObj;
-  m_Matrix.TranslateI(-pRect.left, -pRect.top);
-  int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
-  int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
-  if (horz_size && vert_size && max_dpi) {
-    int dpih =
-        pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
-    int dpiv =
-        pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
-    if (dpih > max_dpi) {
-      m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f);
-    }
-    if (dpiv > max_dpi) {
-      m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv);
-    }
-  }
-  m_pBitmapDevice.reset(new CFX_FxgeDevice);
-  FXDIB_Format dibFormat = FXDIB_Rgb;
-  int32_t bpp = 24;
-  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT) {
-    dibFormat = FXDIB_Argb;
-    bpp = 32;
-  }
-  while (1) {
-    CFX_FloatRect rect(pRect);
-    m_Matrix.TransformRect(rect);
-    FX_RECT bitmap_rect = rect.GetOuterRect();
-    int32_t iWidth = bitmap_rect.Width();
-    int32_t iHeight = bitmap_rect.Height();
-    int32_t iPitch = (iWidth * bpp + 31) / 32 * 4;
-    if (iWidth * iHeight < 1)
-      return false;
-
-    if (iPitch * iHeight <= _FPDFAPI_IMAGESIZE_LIMIT_ &&
-        m_pBitmapDevice->Create(iWidth, iHeight, dibFormat, nullptr)) {
-      break;
-    }
-    m_Matrix.Scale(0.5f, 0.5f);
-  }
-  m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject, pOptions,
-                            &m_Matrix);
-  return true;
-}
-void CPDF_ScaledRenderBuffer::OutputToDevice() {
-  if (m_pBitmapDevice) {
-    m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
-                             m_Rect.top, m_Rect.Width(), m_Rect.Height());
-  }
-}
diff --git a/core/fpdfapi/render/render_int.h b/core/fpdfapi/render/render_int.h
index 9336e068d4..dfad6b14c6 100644
--- a/core/fpdfapi/render/render_int.h
+++ b/core/fpdfapi/render/render_int.h
@@ -49,54 +49,6 @@ class CPDF_Type3Glyphs;
 class CPDF_Type3Char;
 class CPDF_Type3Font;
 
-class CPDF_ScaledRenderBuffer {
- public:
-  CPDF_ScaledRenderBuffer();
-  ~CPDF_ScaledRenderBuffer();
-
-  bool Initialize(CPDF_RenderContext* pContext,
-                  CFX_RenderDevice* pDevice,
-                  const FX_RECT& pRect,
-                  const CPDF_PageObject* pObj,
-                  const CPDF_RenderOptions* pOptions = nullptr,
-                  int max_dpi = 0);
-  CFX_RenderDevice* GetDevice() {
-    return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice;
-  }
-  CFX_Matrix* GetMatrix() { return &m_Matrix; }
-  void OutputToDevice();
-
- private:
-  CFX_RenderDevice* m_pDevice;
-  CPDF_RenderContext* m_pContext;
-  FX_RECT m_Rect;
-  const CPDF_PageObject* m_pObject;
-  std::unique_ptr<CFX_FxgeDevice> m_pBitmapDevice;
-  CFX_Matrix m_Matrix;
-};
-
-class CPDF_DeviceBuffer {
- public:
-  CPDF_DeviceBuffer();
-  ~CPDF_DeviceBuffer();
-  bool Initialize(CPDF_RenderContext* pContext,
-                  CFX_RenderDevice* pDevice,
-                  FX_RECT* pRect,
-                  const CPDF_PageObject* pObj,
-                  int max_dpi = 0);
-  void OutputToDevice();
-  CFX_DIBitmap* GetBitmap() const { return m_pBitmap.get(); }
-  const CFX_Matrix* GetMatrix() const { return &m_Matrix; }
-
- private:
-  CFX_RenderDevice* m_pDevice;
-  CPDF_RenderContext* m_pContext;
-  FX_RECT m_Rect;
-  const CPDF_PageObject* m_pObject;
-  std::unique_ptr<CFX_DIBitmap> m_pBitmap;
-  CFX_Matrix m_Matrix;
-};
-
 class CPDF_ImageCacheEntry {
  public:
   CPDF_ImageCacheEntry(CPDF_Document* pDoc, CPDF_Stream* pStream);