truelight@7433: /* $Id$ */
truelight@7433: 
truelight@7433: /** @file 32bpp_base.hpp */
truelight@7433: 
truelight@7433: #ifndef BLITTER_32BPP_BASE_HPP
truelight@7433: #define BLITTER_32BPP_BASE_HPP
truelight@7433: 
truelight@7433: #include "base.hpp"
rubidium@8609: #include "../core/bitmath_func.hpp"
truelight@7433: 
truelight@7433: class Blitter_32bppBase : public Blitter {
truelight@7433: public:
truelight@7433: 	/* virtual */ uint8 GetScreenDepth() { return 32; }
truelight@7433: //	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
truelight@7433: //	/* virtual */ void DrawColorMappingRect(void *dst, int width, int height, int pal);
truelight@7433: //	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
truelight@7433: 	/* virtual */ void *MoveTo(const void *video, int x, int y);
truelight@7433: 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
truelight@7433: 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
peter1138@7443: 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
truelight@7444: 	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);
truelight@7481: 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
truelight@7481: 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
truelight@7481: 	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
truelight@7447: 	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
truelight@7433: 	/* virtual */ int BufferSize(int width, int height);
truelight@7456: 	/* virtual */ void PaletteAnimate(uint start, uint count);
truelight@7456: 	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
truelight@7433: 
truelight@7465: 	/**
truelight@7465: 	 * Compose a colour based on RGB values.
truelight@7465: 	 */
truelight@7465: 	static inline uint ComposeColour(uint a, uint r, uint g, uint b)
truelight@7465: 	{
truelight@7465: 		return (((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF);
truelight@7465: 	}
truelight@7465: 
truelight@7465: 	/**
truelight@7465: 	 * Look up the colour in the current palette.
truelight@7465: 	 **/
truelight@7465: 	static inline uint32 LookupColourInPalette(uint8 index)
truelight@7465: 	{
truelight@7465: 		if (index == 0) return 0x00000000; // Full transparent pixel */
truelight@7465: 		return ComposeColour(0xFF, _cur_palette[index].r, _cur_palette[index].g, _cur_palette[index].b);
truelight@7465: 	}
truelight@7465: 
truelight@7465: 	/**
truelight@7465: 	 * Compose a colour based on RGBA values and the current pixel value.
truelight@7465: 	 */
truelight@7465: 	static inline uint ComposeColourRGBA(uint r, uint g, uint b, uint a, uint current)
truelight@7465: 	{
truelight@8048: 		if (a == 0) return current;
truelight@8048: 		if (a >= 255) return ComposeColour(0xFF, r, g, b);
truelight@8048: 
truelight@7465: 		uint cr, cg, cb;
truelight@7465: 		cr = GB(current, 16, 8);
truelight@7465: 		cg = GB(current, 8,  8);
truelight@7465: 		cb = GB(current, 0,  8);
truelight@7465: 
truelight@8048: 		/* The 256 is wrong, it should be 255, but 256 is much faster... */
truelight@7465: 		return ComposeColour(0xFF,
truelight@8048: 												(r * a + cr * (256 - a)) / 256,
truelight@8048: 												(g * a + cg * (256 - a)) / 256,
truelight@8048: 												(b * a + cb * (256 - a)) / 256);
truelight@7465: 	}
truelight@7465: 
truelight@7465: 	/**
truelight@7465: 	* Compose a colour based on Pixel value, alpha value, and the current pixel value.
truelight@7465: 	*/
truelight@7465: 	static inline uint ComposeColourPA(uint colour, uint a, uint current)
truelight@7465: 	{
truelight@8048: 		if (a == 0) return current;
truelight@8048: 		if (a >= 255) return (colour | 0xFF000000);
truelight@8048: 
truelight@7465: 		uint r, g, b, cr, cg, cb;
truelight@8048: 		r  = GB(colour,  16, 8);
truelight@8048: 		g  = GB(colour,  8,  8);
truelight@8048: 		b  = GB(colour,  0,  8);
truelight@7465: 		cr = GB(current, 16, 8);
truelight@7465: 		cg = GB(current, 8,  8);
truelight@7465: 		cb = GB(current, 0,  8);
truelight@7465: 
truelight@8048: 		/* The 256 is wrong, it should be 255, but 256 is much faster... */
truelight@7465: 		return ComposeColour(0xFF,
truelight@8048: 												(r * a + cr * (256 - a)) / 256,
truelight@8048: 												(g * a + cg * (256 - a)) / 256,
truelight@8048: 												(b * a + cb * (256 - a)) / 256);
truelight@7465: 	}
truelight@7465: 
truelight@7465: 	/**
truelight@7465: 	* Make a pixel looks like it is transparent.
truelight@7465: 	* @param colour the colour already on the screen.
truelight@8048: 	* @param amount the amount of transparency, times 256.
truelight@7465: 	* @return the new colour for the screen.
truelight@7465: 	*/
truelight@7465: 	static inline uint MakeTransparent(uint colour, uint amount)
truelight@7465: 	{
truelight@7465: 		uint r, g, b;
truelight@7465: 		r = GB(colour, 16, 8);
truelight@7465: 		g = GB(colour, 8,  8);
truelight@7465: 		b = GB(colour, 0,  8);
truelight@7465: 
truelight@8048: 		return ComposeColour(0xFF, r * amount / 256, g * amount / 256, b * amount / 256);
truelight@7465: 	}
truelight@7465: 
truelight@7465: 	/**
truelight@7465: 	* Make a colour grey-based.
truelight@7465: 	* @param colour the colour to make grey.
truelight@7465: 	* @return the new colour, now grey.
truelight@7465: 	*/
truelight@7465: 	static inline uint MakeGrey(uint colour)
truelight@7465: 	{
truelight@7465: 		uint r, g, b;
truelight@7465: 		r = GB(colour, 16, 8);
truelight@7465: 		g = GB(colour, 8,  8);
truelight@7465: 		b = GB(colour, 0,  8);
truelight@7465: 
truelight@7465: 		/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
truelight@7465: 		*  divide by it to normalize the value to a byte again. See heightmap.cpp for
truelight@7465: 		*  information about the formula. */
truelight@7465: 		colour = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
truelight@7465: 
truelight@7465: 		return ComposeColour(0xFF, colour, colour, colour);
truelight@7433: 	}
truelight@7433: };
truelight@7433: 
truelight@7433: #endif /* BLITTER_32BPP_BASE_HPP */