Get rid of NULLs in core/

core/fxge/include/fx_ge.h

Index: core/fxge/include/fx_ge.h
diff --git a/core/fxge/include/fx_ge.h b/core/fxge/include/fx_ge.h
index 1cbbc2cc97f76ee5d5ebf85fc112ac04402802a5..040c16afa2d1baaa7aa7f6b85c9d8fb566522726 100644
--- a/core/fxge/include/fx_ge.h
+++ b/core/fxge/include/fx_ge.h
@@ -424,7 +424,7 @@ class IFX_RenderDeviceDriver {
   static IFX_RenderDeviceDriver* CreateFxgeDriver(
       CFX_DIBitmap* pBitmap,
       FX_BOOL bRgbByteOrder = FALSE,
-      CFX_DIBitmap* pOriDevice = NULL,
+      CFX_DIBitmap* pOriDevice = nullptr,
       FX_BOOL bGroupKnockout = FALSE);
 
   virtual ~IFX_RenderDeviceDriver() {}
@@ -458,21 +458,21 @@ class IFX_RenderDeviceDriver {
                            uint32_t stroke_color,
                            int fill_mode,
                            int alpha_flag = 0,
-                           void* pIccTransform = NULL,
+                           void* pIccTransform = nullptr,
                            int blend_type = FXDIB_BLEND_NORMAL) = 0;
 
   virtual FX_BOOL SetPixel(int x,
                            int y,
                            uint32_t color,
                            int alpha_flag = 0,
-                           void* pIccTransform = NULL) {
+                           void* pIccTransform = nullptr) {
     return FALSE;
   }
 
   virtual FX_BOOL FillRect(const FX_RECT* pRect,
                            uint32_t fill_color,
                            int alpha_flag = 0,
-                           void* pIccTransform = NULL,
+                           void* pIccTransform = nullptr,
                            int blend_type = FXDIB_BLEND_NORMAL) {
     return FALSE;
   }
@@ -483,7 +483,7 @@ class IFX_RenderDeviceDriver {
                                    FX_FLOAT y2,
                                    uint32_t color,
                                    int alpha_flag = 0,
-                                   void* pIccTransform = NULL,
+                                   void* pIccTransform = nullptr,
                                    int blend_type = FXDIB_BLEND_NORMAL) {
     return FALSE;
   }
@@ -493,11 +493,11 @@ class IFX_RenderDeviceDriver {
   virtual FX_BOOL GetDIBits(CFX_DIBitmap* pBitmap,
                             int left,
                             int top,
-                            void* pIccTransform = NULL,
+                            void* pIccTransform = nullptr,
                             FX_BOOL bDEdge = FALSE) {
     return FALSE;
   }
-  virtual CFX_DIBitmap* GetBackDrop() { return NULL; }
+  virtual CFX_DIBitmap* GetBackDrop() { return nullptr; }
 
   virtual FX_BOOL SetDIBits(const CFX_DIBSource* pBitmap,
                             uint32_t color,
@@ -506,7 +506,7 @@ class IFX_RenderDeviceDriver {
                             int dest_top,
                             int blend_type,
                             int alpha_flag = 0,
-                            void* pIccTransform = NULL) = 0;
+                            void* pIccTransform = nullptr) = 0;
 
   virtual FX_BOOL StretchDIBits(const CFX_DIBSource* pBitmap,
                                 uint32_t color,
@@ -517,7 +517,7 @@ class IFX_RenderDeviceDriver {
                                 const FX_RECT* pClipRect,
                                 uint32_t flags,
                                 int alpha_flag = 0,
-                                void* pIccTransform = NULL,
+                                void* pIccTransform = nullptr,
                                 int blend_type = FXDIB_BLEND_NORMAL) = 0;
 
   virtual FX_BOOL StartDIBits(const CFX_DIBSource* pBitmap,
@@ -527,7 +527,7 @@ class IFX_RenderDeviceDriver {
                               uint32_t flags,
                               void*& handle,
                               int alpha_flag = 0,
-                              void* pIccTransform = NULL,
+                              void* pIccTransform = nullptr,
                               int blend_type = FXDIB_BLEND_NORMAL) = 0;
 
   virtual FX_BOOL ContinueDIBits(void* handle, IFX_Pause* pPause) {
@@ -544,11 +544,11 @@ class IFX_RenderDeviceDriver {
                                  FX_FLOAT font_size,
                                  uint32_t color,
                                  int alpha_flag = 0,
-                                 void* pIccTransform = NULL) {
+                                 void* pIccTransform = nullptr) {
     return FALSE;
   }
 
-  virtual void* GetPlatformSurface() const { return NULL; }
+  virtual void* GetPlatformSurface() const { return nullptr; }
   virtual int GetDriverType() const { return 0; }
   virtual void ClearDriver() {}