Merge to XFA: Add type cast definitions for CPDF_Stream.

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp

 // 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 <vector>
 
 #include "../../../../third_party/base/nonstd_unique_ptr.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
@@ skipping 747 matching lines @@
       }
     }
   }
   m_bpc = 8;
 }
 CPDF_DIBSource* CPDF_DIBSource::LoadMask(FX_DWORD& MatteColor) {
   MatteColor = 0xFFFFFFFF;
   CPDF_Stream* pSoftMask = m_pDict->GetStream(FX_BSTRC("SMask"));
   if (pSoftMask) {
     CPDF_Array* pMatte = pSoftMask->GetDict()->GetArray(FX_BSTRC("Matte"));
-    if (pMatte != NULL && m_pColorSpace &&
+    if (pMatte && m_pColorSpace &&
         (FX_DWORD)m_pColorSpace->CountComponents() <= m_nComponents) {
       FX_FLOAT* pColor = FX_Alloc(FX_FLOAT, m_nComponents);
       for (FX_DWORD i = 0; i < m_nComponents; i++) {
         pColor[i] = pMatte->GetFloat(i);
       }
       FX_FLOAT R, G, B;
       m_pColorSpace->GetRGB(pColor, R, G, B);
       FX_Free(pColor);
       MatteColor = FXARGB_MAKE(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
                                FXSYS_round(B * 255));
     }
     return LoadMaskDIB(pSoftMask);
   }
-  CPDF_Object* pMask = m_pDict->GetElementValue(FX_BSTRC("Mask"));
-  if (pMask == NULL) {
-    return NULL;
-  }
-  if (pMask->GetType() == PDFOBJ_STREAM) {
-    return LoadMaskDIB((CPDF_Stream*)pMask);
-  }
-  return NULL;
+
+  if (CPDF_Stream* pStream =
+          ToStream(m_pDict->GetElementValue(FX_BSTRC("Mask"))))
+    return LoadMaskDIB(pStream);
+
+  return nullptr;
 }
 int CPDF_DIBSource::StratLoadMask() {
   m_MatteColor = 0XFFFFFFFF;
   m_pMaskStream = m_pDict->GetStream(FX_BSTRC("SMask"));
   if (m_pMaskStream) {
     CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArray(FX_BSTRC("Matte"));
     if (pMatte != NULL && m_pColorSpace &&
         (FX_DWORD)m_pColorSpace->CountComponents() <= m_nComponents) {
       FX_FLOAT R, G, B;
       FX_FLOAT* pColor = FX_Alloc(FX_FLOAT, m_nComponents);
       for (FX_DWORD i = 0; i < m_nComponents; i++) {
         pColor[i] = pMatte->GetFloat(i);
       }
       m_pColorSpace->GetRGB(pColor, R, G, B);
       FX_Free(pColor);
       m_MatteColor = FXARGB_MAKE(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
                                  FXSYS_round(B * 255));
     }
     return StartLoadMaskDIB();
   }
-  m_pMaskStream = m_pDict->GetElementValue(FX_BSTRC("Mask"));
-  if (m_pMaskStream == NULL) {
-    return 1;
-  }
-  if (m_pMaskStream->GetType() == PDFOBJ_STREAM) {
-    return StartLoadMaskDIB();
-  }
-  return 1;
+
+  m_pMaskStream = ToStream(m_pDict->GetElementValue(FX_BSTRC("Mask")));
+  return m_pMaskStream ? StartLoadMaskDIB() : 1;
 }
 int CPDF_DIBSource::ContinueLoadMaskDIB(IFX_Pause* pPause) {
   if (m_pMask == NULL) {
     return 1;
   }
   int ret = m_pMask->ContinueLoadDIBSource(pPause);
   if (ret == 2) {
     return ret;
   }
   if (m_pColorSpace && m_bStdCS) {
@@ skipping 14 matching lines @@
 CPDF_DIBSource* CPDF_DIBSource::LoadMaskDIB(CPDF_Stream* pMask) {
   CPDF_DIBSource* pMaskSource = new CPDF_DIBSource;
   if (!pMaskSource->Load(m_pDocument, pMask, NULL, NULL, NULL, NULL, TRUE)) {
     delete pMaskSource;
     return NULL;
   }
   return pMaskSource;
 }
 int CPDF_DIBSource::StartLoadMaskDIB() {
   m_pMask = new CPDF_DIBSource;
-  int ret = m_pMask->StartLoadDIBSource(
-      m_pDocument, (CPDF_Stream*)m_pMaskStream, FALSE, NULL, NULL, TRUE);
+  int ret = m_pMask->StartLoadDIBSource(m_pDocument, m_pMaskStream, FALSE,
+                                        nullptr, nullptr, TRUE);
   if (ret == 2) {
-    if (m_Status == 0) {
+    if (m_Status == 0)
       m_Status = 2;
-    }
     return 2;
   }
   if (!ret) {
     delete m_pMask;
-    m_pMask = NULL;
+    m_pMask = nullptr;
     return 1;
   }
   return 1;
 }
 void CPDF_DIBSource::LoadPalette() {
   if (m_bpc == 0) {
     return;
   }
   if (m_bpc * m_nComponents > 8) {
     return;
@@ skipping 779 matching lines @@
 }
 FX_BOOL CPDF_ImageLoader::Continue(void* LoadHandle, IFX_Pause* pPause) {
   return ((CPDF_ProgressiveImageLoaderHandle*)LoadHandle)->Continue(pPause);
 }
 CPDF_ImageLoader::~CPDF_ImageLoader() {
   if (!m_bCached) {
     delete m_pBitmap;
     delete m_pMask;
   }
 }