Codechange: Replicate cursor screen backup to chat message display, removing explicit memory management.

Incidentally, this makes Blitter::GetBytesPerPixel unneeed.

src/blitter/32bpp_anim.hpp

@@ -48,7 +48,6 @@ public:
 	Blitter::PaletteAnimation UsePaletteAnimation() override;
 
 	const char *GetName() override { return "32bpp-anim"; }
-	int GetBytesPerPixel() override { return 6; }
 	void PostResize() override;
 
 	/**

src/blitter/32bpp_base.hpp

@@ -30,7 +30,6 @@ public:
 	size_t BufferSize(uint width, uint 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.

src/blitter/40bpp_anim.hpp

@@ -33,7 +33,6 @@ public:
 	bool NeedsAnimationBuffer() override;
 
 	const char *GetName()  override { return "40bpp-anim"; }
-	int GetBytesPerPixel()  override { return 5; }
 
 	template <BlitterMode mode> void Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom);
 

src/blitter/8bpp_base.hpp

@@ -28,7 +28,6 @@ public:
 	size_t BufferSize(uint width, uint height) override;
 	void PaletteAnimate(const Palette &palette) override;
 	Blitter::PaletteAnimation UsePaletteAnimation() override;
-	int GetBytesPerPixel() override { return 1; }
 };
 
 #endif /* BLITTER_8BPP_BASE_HPP */

src/blitter/base.hpp

@@ -198,11 +198,6 @@ public:
 	 */
 	virtual const char *GetName() = 0;
 
-	/**
-	 * Get how many bytes are needed to store a pixel.
-	 */
-	virtual int GetBytesPerPixel() = 0;
-
 	/**
 	 * Post resize event
 	 */

src/blitter/null.hpp

@@ -32,7 +32,6 @@ public:
 	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. */