1 files changed, 75 insertions, 0 deletions
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());
+}