32bpp_base.hpp

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00001 /* $Id: 32bpp_base.hpp 15711 2009-03-14 18:16:29Z rubidium $ */
00002 
00005 #ifndef BLITTER_32BPP_BASE_HPP
00006 #define BLITTER_32BPP_BASE_HPP
00007 
00008 #include "base.hpp"
00009 #include "../core/bitmath_func.hpp"
00010 
00011 class Blitter_32bppBase : public Blitter {
00012 public:
00013   /* virtual */ uint8 GetScreenDepth() { return 32; }
00014 //  /* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
00015 //  /* virtual */ void DrawColourMappingRect(void *dst, int width, int height, int pal);
00016 //  /* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
00017   /* virtual */ void *MoveTo(const void *video, int x, int y);
00018   /* virtual */ void SetPixel(void *video, int x, int y, uint8 colour);
00019   /* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 colour);
00020   /* virtual */ void DrawRect(void *video, int width, int height, uint8 colour);
00021   /* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour);
00022   /* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
00023   /* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
00024   /* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
00025   /* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
00026   /* virtual */ int BufferSize(int width, int height);
00027   /* virtual */ void PaletteAnimate(uint start, uint count);
00028   /* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
00029   /* virtual */ int GetBytesPerPixel() { return 4; }
00030 
00034   static inline uint32 ComposeColour(uint a, uint r, uint g, uint b)
00035   {
00036     return (((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF);
00037   }
00038 
00042   static inline uint32 LookupColourInPalette(uint index)
00043   {
00044     return _cur_palette[index];
00045   }
00046 
00050   static inline uint32 ComposeColourRGBANoCheck(uint r, uint g, uint b, uint a, uint32 current)
00051   {
00052     uint cr = GB(current, 16, 8);
00053     uint cg = GB(current, 8,  8);
00054     uint cb = GB(current, 0,  8);
00055 
00056     /* The 256 is wrong, it should be 255, but 256 is much faster... */
00057     return ComposeColour(0xFF,
00058               ((int)(r - cr) * a) / 256 + cr,
00059               ((int)(g - cg) * a) / 256 + cg,
00060               ((int)(b - cb) * a) / 256 + cb);
00061   }
00062 
00067   static inline uint32 ComposeColourRGBA(uint r, uint g, uint b, uint a, uint32 current)
00068   {
00069     if (a == 0) return current;
00070     if (a >= 255) return ComposeColour(0xFF, r, g, b);
00071 
00072     return ComposeColourRGBANoCheck(r, g, b, a, current);
00073   }
00074 
00078   static inline uint32 ComposeColourPANoCheck(uint32 colour, uint a, uint32 current)
00079   {
00080     uint r  = GB(colour,  16, 8);
00081     uint g  = GB(colour,  8,  8);
00082     uint b  = GB(colour,  0,  8);
00083 
00084     return ComposeColourRGBANoCheck(r, g, b, a, current);
00085   }
00086 
00091   static inline uint32 ComposeColourPA(uint32 colour, uint a, uint32 current)
00092   {
00093     if (a == 0) return current;
00094     if (a >= 255) return (colour | 0xFF000000);
00095 
00096     return ComposeColourPANoCheck(colour, a, current);
00097   }
00098 
00106   static inline uint32 MakeTransparent(uint32 colour, uint nom, uint denom = 256)
00107   {
00108     uint r = GB(colour, 16, 8);
00109     uint g = GB(colour, 8,  8);
00110     uint b = GB(colour, 0,  8);
00111 
00112     return ComposeColour(0xFF, r * nom / denom, g * nom / denom, b * nom / denom);
00113   }
00114 
00120   static inline uint32 MakeGrey(uint32 colour)
00121   {
00122     uint r = GB(colour, 16, 8);
00123     uint g = GB(colour, 8,  8);
00124     uint b = GB(colour, 0,  8);
00125 
00126     /* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
00127      *  divide by it to normalize the value to a byte again. See heightmap.cpp for
00128      *  information about the formula. */
00129     colour = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
00130 
00131     return ComposeColour(0xFF, colour, colour, colour);
00132   }
00133 };
00134 
00135 #endif /* BLITTER_32BPP_BASE_HPP */

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