author | rubidium |
Sun, 25 May 2008 19:17:03 +0000 | |
changeset 9354 | 845e07db4549 |
parent 9111 | 48ce04029fe4 |
child 9551 | 6f60dca6c566 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file 32bpp_base.hpp Base for all 32 bits blitters. */ |
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#ifndef BLITTER_32BPP_BASE_HPP |
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#define BLITTER_32BPP_BASE_HPP |
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#include "base.hpp" |
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#include "../core/bitmath_func.hpp" |
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class Blitter_32bppBase : public Blitter { |
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public: |
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/* virtual */ uint8 GetScreenDepth() { return 32; } |
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// /* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom); |
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// /* virtual */ void DrawColorMappingRect(void *dst, int width, int height, int pal); |
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// /* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator); |
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/* virtual */ void *MoveTo(const void *video, int x, int y); |
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/* virtual */ void SetPixel(void *video, int x, int y, uint8 color); |
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/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color); |
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/* virtual */ void DrawRect(void *video, int width, int height, uint8 color); |
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/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color); |
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/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height); |
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/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height); |
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/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch); |
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/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y); |
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/* virtual */ int BufferSize(int width, int height); |
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/* virtual */ void PaletteAnimate(uint start, uint count); |
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/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation(); |
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/** |
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* Compose a colour based on RGB values. |
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*/ |
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static inline uint ComposeColour(uint a, uint r, uint g, uint b) |
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{ |
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return (((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF); |
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} |
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/** |
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* Look up the colour in the current palette. |
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**/ |
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static inline uint32 LookupColourInPalette(uint8 index) |
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{ |
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if (index == 0) return 0x00000000; // Full transparent pixel */ |
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return ComposeColour(0xFF, _cur_palette[index].r, _cur_palette[index].g, _cur_palette[index].b); |
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} |
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/** |
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* Compose a colour based on RGBA values and the current pixel value. |
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*/ |
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static inline uint ComposeColourRGBA(uint r, uint g, uint b, uint a, uint current) |
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{ |
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if (a == 0) return current; |
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if (a >= 255) return ComposeColour(0xFF, r, g, b); |
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uint cr, cg, cb; |
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cr = GB(current, 16, 8); |
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cg = GB(current, 8, 8); |
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cb = GB(current, 0, 8); |
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/* The 256 is wrong, it should be 255, but 256 is much faster... */ |
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return ComposeColour(0xFF, |
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(r * a + cr * (256 - a)) / 256, |
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(g * a + cg * (256 - a)) / 256, |
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(b * a + cb * (256 - a)) / 256); |
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} |
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/** |
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* Compose a colour based on Pixel value, alpha value, and the current pixel value. |
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*/ |
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static inline uint ComposeColourPA(uint colour, uint a, uint current) |
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{ |
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if (a == 0) return current; |
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if (a >= 255) return (colour | 0xFF000000); |
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uint r, g, b, cr, cg, cb; |
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r = GB(colour, 16, 8); |
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g = GB(colour, 8, 8); |
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b = GB(colour, 0, 8); |
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cr = GB(current, 16, 8); |
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cg = GB(current, 8, 8); |
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cb = GB(current, 0, 8); |
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/* The 256 is wrong, it should be 255, but 256 is much faster... */ |
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return ComposeColour(0xFF, |
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(r * a + cr * (256 - a)) / 256, |
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(g * a + cg * (256 - a)) / 256, |
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(b * a + cb * (256 - a)) / 256); |
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} |
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/** |
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* Make a pixel looks like it is transparent. |
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* @param colour the colour already on the screen. |
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* @param amount the amount of transparency, times 256. |
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* @return the new colour for the screen. |
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*/ |
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static inline uint MakeTransparent(uint colour, uint amount) |
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{ |
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uint r, g, b; |
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r = GB(colour, 16, 8); |
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g = GB(colour, 8, 8); |
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b = GB(colour, 0, 8); |
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102 |
|
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return ComposeColour(0xFF, r * amount / 256, g * amount / 256, b * amount / 256); |
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} |
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105 |
|
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/** |
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* Make a colour grey - based. |
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* @param colour the colour to make grey. |
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* @return the new colour, now grey. |
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*/ |
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static inline uint MakeGrey(uint colour) |
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{ |
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uint r, g, b; |
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r = GB(colour, 16, 8); |
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g = GB(colour, 8, 8); |
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b = GB(colour, 0, 8); |
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117 |
|
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/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then |
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* divide by it to normalize the value to a byte again. See heightmap.cpp for |
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* information about the formula. */ |
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colour = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536; |
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122 |
|
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return ComposeColour(0xFF, colour, colour, colour); |
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} |
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}; |
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|
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#endif /* BLITTER_32BPP_BASE_HPP */ |