Codechange: Use override specifer for overriding member declarations

This is a C++11 feature that allows the compiler to check that a virtual
member declaration overrides a base-class member with the same signature.

Also src/blitter/32bpp_anim_sse4.hpp +38 is no longer erroneously marked
as virtual despite being a template.

13 files changed, 96 insertions, 96 deletions

diff --git a/src/blitter/32bpp_anim.hpp b/src/blitter/32bpp_anim.hpp
index ecf6dcfca..f8fd89281 100644
--- a/src/blitter/32bpp_anim.hpp
+++ b/src/blitter/32bpp_anim.hpp
@@ -37,21 +37,21 @@ public:
 
 	~Blitter_32bppAnim();
 
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal);
-	/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour);
-	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash);
-	/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour);
-	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
-	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
-	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
-	/* virtual */ int BufferSize(int width, int height);
-	/* virtual */ void PaletteAnimate(const Palette &palette);
-	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) override;
+	void SetPixel(void *video, int x, int y, uint8 colour) override;
+	void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) override;
+	void DrawRect(void *video, int width, int height, uint8 colour) override;
+	void CopyFromBuffer(void *video, const void *src, int width, int height) override;
+	void CopyToBuffer(const void *video, void *dst, int width, int height) override;
+	void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override;
+	int BufferSize(int width, int height) override;
+	void PaletteAnimate(const Palette &palette) override;
+	Blitter::PaletteAnimation UsePaletteAnimation() override;
 
-	/* virtual */ const char *GetName() { return "32bpp-anim"; }
-	/* virtual */ int GetBytesPerPixel() { return 6; }
-	/* virtual */ void PostResize();
+	const char *GetName() override { return "32bpp-anim"; }
+	int GetBytesPerPixel() override { return 6; }
+	void PostResize() override;
 
 	/**
 	 * Look up the colour in the current palette.
@@ -77,7 +77,7 @@ public:
 class FBlitter_32bppAnim : public BlitterFactory {
 public:
 	FBlitter_32bppAnim() : BlitterFactory("32bpp-anim", "32bpp Animation Blitter (palette animation)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppAnim(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppAnim(); }
 };
 
 #endif /* BLITTER_32BPP_ANIM_HPP */
diff --git a/src/blitter/32bpp_anim_sse2.hpp b/src/blitter/32bpp_anim_sse2.hpp
index 0d4a5f1e6..aed11026c 100644
--- a/src/blitter/32bpp_anim_sse2.hpp
+++ b/src/blitter/32bpp_anim_sse2.hpp
@@ -28,15 +28,15 @@
 /** A partially 32 bpp blitter with palette animation. */
 class Blitter_32bppSSE2_Anim : public Blitter_32bppAnim {
 public:
-	/* virtual */ void PaletteAnimate(const Palette &palette);
-	/* virtual */ const char *GetName() { return "32bpp-sse2-anim"; }
+	void PaletteAnimate(const Palette &palette) override;
+	const char *GetName() override { return "32bpp-sse2-anim"; }
 };
 
 /** Factory for the partially 32bpp blitter with animation. */
 class FBlitter_32bppSSE2_Anim : public BlitterFactory {
 public:
 	FBlitter_32bppSSE2_Anim() : BlitterFactory("32bpp-sse2-anim", "32bpp partially SSE2 Animation Blitter (palette animation)", HasCPUIDFlag(1, 3, 26)) {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSSE2_Anim(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSSE2_Anim(); }
 };
 
 #endif /* WITH_SSE */
diff --git a/src/blitter/32bpp_anim_sse4.hpp b/src/blitter/32bpp_anim_sse4.hpp
index 5ff1fb01b..2fefd3001 100644
--- a/src/blitter/32bpp_anim_sse4.hpp
+++ b/src/blitter/32bpp_anim_sse4.hpp
@@ -35,19 +35,19 @@ private:
 
 public:
 	template <BlitterMode mode, Blitter_32bppSSE_Base::ReadMode read_mode, Blitter_32bppSSE_Base::BlockType bt_last, bool translucent, bool animated>
-	/* virtual */ void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) {
+	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override {
 		return Blitter_32bppSSE_Base::Encode(sprite, allocator);
 	}
-	/* virtual */ const char *GetName() { return "32bpp-sse4-anim"; }
+	const char *GetName() override { return "32bpp-sse4-anim"; }
 };
 
 /** Factory for the SSE4 32 bpp blitter (with palette animation). */
 class FBlitter_32bppSSE4_Anim: public BlitterFactory {
 public:
 	FBlitter_32bppSSE4_Anim() : BlitterFactory("32bpp-sse4-anim", "SSE4 Blitter (palette animation)", HasCPUIDFlag(1, 2, 19)) {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSSE4_Anim(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSSE4_Anim(); }
 };
 
 #endif /* WITH_SSE */
diff --git a/src/blitter/32bpp_base.hpp b/src/blitter/32bpp_base.hpp
index 697593da6..e481c15cc 100644
--- a/src/blitter/32bpp_base.hpp
+++ b/src/blitter/32bpp_base.hpp
@@ -20,19 +20,19 @@
 /** Base for all 32bpp blitters. */
 class Blitter_32bppBase : public Blitter {
 public:
-	/* virtual */ uint8 GetScreenDepth() { return 32; }
-	/* virtual */ void *MoveTo(void *video, int x, int y);
-	/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour);
-	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash);
-	/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour);
-	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
-	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
-	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
-	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
-	/* virtual */ int BufferSize(int width, int height);
-	/* virtual */ void PaletteAnimate(const Palette &palette);
-	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
-	/* virtual */ int GetBytesPerPixel() { return 4; }
+	uint8 GetScreenDepth() override { return 32; }
+	void *MoveTo(void *video, int x, int y) override;
+	void SetPixel(void *video, int x, int y, uint8 colour) override;
+	void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) override;
+	void DrawRect(void *video, int width, int height, uint8 colour) override;
+	void CopyFromBuffer(void *video, const void *src, int width, int height) override;
+	void CopyToBuffer(const void *video, void *dst, int width, int height) override;
+	void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) override;
+	void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override;
+	int BufferSize(int width, int height) override;
+	void PaletteAnimate(const Palette &palette) override;
+	Blitter::PaletteAnimation UsePaletteAnimation() override;
+	int GetBytesPerPixel() override { return 4; }
 
 	/**
 	 * Look up the colour in the current palette.
diff --git a/src/blitter/32bpp_optimized.hpp b/src/blitter/32bpp_optimized.hpp
index c261aa33d..fc8a40653 100644
--- a/src/blitter/32bpp_optimized.hpp
+++ b/src/blitter/32bpp_optimized.hpp
@@ -23,10 +23,10 @@ public:
 		byte data[];                      ///< Data, all zoomlevels.
 	};
 
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
 
-	/* virtual */ const char *GetName() { return "32bpp-optimized"; }
+	const char *GetName() override { return "32bpp-optimized"; }
 
 	template <BlitterMode mode> void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
 };
@@ -35,7 +35,7 @@ public:
 class FBlitter_32bppOptimized : public BlitterFactory {
 public:
 	FBlitter_32bppOptimized() : BlitterFactory("32bpp-optimized", "32bpp Optimized Blitter (no palette animation)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppOptimized(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppOptimized(); }
 };
 
 #endif /* BLITTER_32BPP_OPTIMIZED_HPP */
diff --git a/src/blitter/32bpp_simple.hpp b/src/blitter/32bpp_simple.hpp
index 0751f6f75..3d43971e9 100644
--- a/src/blitter/32bpp_simple.hpp
+++ b/src/blitter/32bpp_simple.hpp
@@ -26,18 +26,18 @@ class Blitter_32bppSimple : public Blitter_32bppBase {
 		uint8 v;  ///< Brightness-channel
 	};
 public:
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal);
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) override;
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
 
-	/* virtual */ const char *GetName() { return "32bpp-simple"; }
+	const char *GetName() override { return "32bpp-simple"; }
 };
 
 /** Factory for the simple 32 bpp blitter. */
 class FBlitter_32bppSimple : public BlitterFactory {
 public:
 	FBlitter_32bppSimple() : BlitterFactory("32bpp-simple", "32bpp Simple Blitter (no palette animation)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSimple(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSimple(); }
 };
 
 #endif /* BLITTER_32BPP_SIMPLE_HPP */
diff --git a/src/blitter/32bpp_sse2.hpp b/src/blitter/32bpp_sse2.hpp
index d6b17f679..1628f1fa2 100644
--- a/src/blitter/32bpp_sse2.hpp
+++ b/src/blitter/32bpp_sse2.hpp
@@ -82,22 +82,22 @@ DECLARE_ENUM_AS_BIT_SET(Blitter_32bppSSE_Base::SpriteFlags);
 /** The SSE2 32 bpp blitter (without palette animation). */
 class Blitter_32bppSSE2 : public Blitter_32bppSimple, public Blitter_32bppSSE_Base {
 public:
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
 	template <BlitterMode mode, Blitter_32bppSSE_Base::ReadMode read_mode, Blitter_32bppSSE_Base::BlockType bt_last, bool translucent>
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
 
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) {
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override {
 		return Blitter_32bppSSE_Base::Encode(sprite, allocator);
 	}
 
-	/* virtual */ const char *GetName() { return "32bpp-sse2"; }
+	const char *GetName() override { return "32bpp-sse2"; }
 };
 
 /** Factory for the SSE2 32 bpp blitter (without palette animation). */
 class FBlitter_32bppSSE2 : public BlitterFactory {
 public:
 	FBlitter_32bppSSE2() : BlitterFactory("32bpp-sse2", "32bpp SSE2 Blitter (no palette animation)", HasCPUIDFlag(1, 3, 26)) {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSSE2(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSSE2(); }
 };
 
 #endif /* WITH_SSE */
diff --git a/src/blitter/32bpp_sse4.hpp b/src/blitter/32bpp_sse4.hpp
index 9c59d253f..36b5b16d4 100644
--- a/src/blitter/32bpp_sse4.hpp
+++ b/src/blitter/32bpp_sse4.hpp
@@ -27,17 +27,17 @@
 /** The SSE4 32 bpp blitter (without palette animation). */
 class Blitter_32bppSSE4 : public Blitter_32bppSSSE3 {
 public:
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
 	template <BlitterMode mode, Blitter_32bppSSE_Base::ReadMode read_mode, Blitter_32bppSSE_Base::BlockType bt_last, bool translucent>
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
-	/* virtual */ const char *GetName() { return "32bpp-sse4"; }
+	const char *GetName() override { return "32bpp-sse4"; }
 };
 
 /** Factory for the SSE4 32 bpp blitter (without palette animation). */
 class FBlitter_32bppSSE4: public BlitterFactory {
 public:
 	FBlitter_32bppSSE4() : BlitterFactory("32bpp-sse4", "32bpp SSE4 Blitter (no palette animation)", HasCPUIDFlag(1, 2, 19)) {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSSE4(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSSE4(); }
 };
 
 #endif /* WITH_SSE */
diff --git a/src/blitter/32bpp_ssse3.hpp b/src/blitter/32bpp_ssse3.hpp
index e9cac8ff0..3d6152e9e 100644
--- a/src/blitter/32bpp_ssse3.hpp
+++ b/src/blitter/32bpp_ssse3.hpp
@@ -27,17 +27,17 @@
 /** The SSSE3 32 bpp blitter (without palette animation). */
 class Blitter_32bppSSSE3 : public Blitter_32bppSSE2 {
 public:
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
 	template <BlitterMode mode, Blitter_32bppSSE_Base::ReadMode read_mode, Blitter_32bppSSE_Base::BlockType bt_last, bool translucent>
 	void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
-	/* virtual */ const char *GetName() { return "32bpp-ssse3"; }
+	const char *GetName() override { return "32bpp-ssse3"; }
 };
 
 /** Factory for the SSSE3 32 bpp blitter (without palette animation). */
 class FBlitter_32bppSSSE3: public BlitterFactory {
 public:
 	FBlitter_32bppSSSE3() : BlitterFactory("32bpp-ssse3", "32bpp SSSE3 Blitter (no palette animation)", HasCPUIDFlag(1, 2, 9)) {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_32bppSSSE3(); }
+	Blitter *CreateInstance() override { return new Blitter_32bppSSSE3(); }
 };
 
 #endif /* WITH_SSE */
diff --git a/src/blitter/8bpp_base.hpp b/src/blitter/8bpp_base.hpp
index 8f75dda5d..7ab3f6378 100644
--- a/src/blitter/8bpp_base.hpp
+++ b/src/blitter/8bpp_base.hpp
@@ -17,20 +17,20 @@
 /** Base for all 8bpp blitters. */
 class Blitter_8bppBase : public Blitter {
 public:
-	/* virtual */ uint8 GetScreenDepth() { return 8; }
-	/* virtual */ void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal);
-	/* virtual */ void *MoveTo(void *video, int x, int y);
-	/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour);
-	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash);
-	/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour);
-	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
-	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
-	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
-	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
-	/* virtual */ int BufferSize(int width, int height);
-	/* virtual */ void PaletteAnimate(const Palette &palette);
-	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
-	/* virtual */ int GetBytesPerPixel() { return 1; }
+	uint8 GetScreenDepth() override { return 8; }
+	void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) override;
+	void *MoveTo(void *video, int x, int y) override;
+	void SetPixel(void *video, int x, int y, uint8 colour) override;
+	void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) override;
+	void DrawRect(void *video, int width, int height, uint8 colour) override;
+	void CopyFromBuffer(void *video, const void *src, int width, int height) override;
+	void CopyToBuffer(const void *video, void *dst, int width, int height) override;
+	void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) override;
+	void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override;
+	int BufferSize(int width, int height) override;
+	void PaletteAnimate(const Palette &palette) override;
+	Blitter::PaletteAnimation UsePaletteAnimation() override;
+	int GetBytesPerPixel() override { return 1; }
 };
 
 #endif /* BLITTER_8BPP_BASE_HPP */
diff --git a/src/blitter/8bpp_optimized.hpp b/src/blitter/8bpp_optimized.hpp
index b5b5324b9..509edb8c4 100644
--- a/src/blitter/8bpp_optimized.hpp
+++ b/src/blitter/8bpp_optimized.hpp
@@ -24,17 +24,17 @@ public:
 		byte data[];                   ///< Data, all zoomlevels.
 	};
 
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
 
-	/* virtual */ const char *GetName() { return "8bpp-optimized"; }
+	const char *GetName() override { return "8bpp-optimized"; }
 };
 
 /** Factory for the 8bpp blitter optimised for speed. */
 class FBlitter_8bppOptimized : public BlitterFactory {
 public:
 	FBlitter_8bppOptimized() : BlitterFactory("8bpp-optimized", "8bpp Optimized Blitter (compression + all-ZoomLevel cache)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_8bppOptimized(); }
+	Blitter *CreateInstance() override { return new Blitter_8bppOptimized(); }
 };
 
 #endif /* BLITTER_8BPP_OPTIMIZED_HPP */
diff --git a/src/blitter/8bpp_simple.hpp b/src/blitter/8bpp_simple.hpp
index c00c75ac0..e48bc3758 100644
--- a/src/blitter/8bpp_simple.hpp
+++ b/src/blitter/8bpp_simple.hpp
@@ -18,17 +18,17 @@
 /** Most trivial 8bpp blitter. */
 class Blitter_8bppSimple FINAL : public Blitter_8bppBase {
 public:
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override;
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
 
-	/* virtual */ const char *GetName() { return "8bpp-simple"; }
+	const char *GetName() override { return "8bpp-simple"; }
 };
 
 /** Factory for the most trivial 8bpp blitter. */
 class FBlitter_8bppSimple : public BlitterFactory {
 public:
 	FBlitter_8bppSimple() : BlitterFactory("8bpp-simple", "8bpp Simple Blitter (relative slow, but never wrong)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_8bppSimple(); }
+	Blitter *CreateInstance() override { return new Blitter_8bppSimple(); }
 };
 
 #endif /* BLITTER_8BPP_SIMPLE_HPP */
diff --git a/src/blitter/null.hpp b/src/blitter/null.hpp
index a6fed2ebc..8dc98646c 100644
--- a/src/blitter/null.hpp
+++ b/src/blitter/null.hpp
@@ -17,31 +17,31 @@
 /** Blitter that does nothing. */
 class Blitter_Null : public Blitter {
 public:
-	/* virtual */ uint8 GetScreenDepth() { return 0; }
-	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) {};
-	/* virtual */ void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) {};
-	/* virtual */ Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator);
-	/* virtual */ void *MoveTo(void *video, int x, int y) { return NULL; };
-	/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour) {};
-	/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour) {};
-	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) {};
-	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height) {};
-	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height) {};
-	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) {};
-	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) {};
-	/* virtual */ int BufferSize(int width, int height) { return 0; };
-	/* virtual */ void PaletteAnimate(const Palette &palette) { };
-	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation() { return Blitter::PALETTE_ANIMATION_NONE; };
-
-	/* virtual */ const char *GetName() { return "null"; }
-	/* virtual */ int GetBytesPerPixel() { return 0; }
+	uint8 GetScreenDepth() override { return 0; }
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override {};
+	void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) override {};
+	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
+	void *MoveTo(void *video, int x, int y) override { return NULL; };
+	void SetPixel(void *video, int x, int y, uint8 colour) override {};
+	void DrawRect(void *video, int width, int height, uint8 colour) override {};
+	void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour, int width, int dash) override {};
+	void CopyFromBuffer(void *video, const void *src, int width, int height) override {};
+	void CopyToBuffer(const void *video, void *dst, int width, int height) override {};
+	void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) override {};
+	void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override {};
+	int BufferSize(int width, int height) override { return 0; };
+	void PaletteAnimate(const Palette &palette) override { };
+	Blitter::PaletteAnimation UsePaletteAnimation() override { return Blitter::PALETTE_ANIMATION_NONE; };
+
+	const char *GetName() override { return "null"; }
+	int GetBytesPerPixel() override { return 0; }
 };
 
 /** Factory for the blitter that does nothing. */
 class FBlitter_Null : public BlitterFactory {
 public:
 	FBlitter_Null() : BlitterFactory("null", "Null Blitter (does nothing)") {}
-	/* virtual */ Blitter *CreateInstance() { return new Blitter_Null(); }
+	Blitter *CreateInstance() override { return new Blitter_Null(); }
 };
 
 #endif /* BLITTER_NULL_HPP */