1

/* $Id$ */

     2

     3

/** @file 32bpp_base.hpp */

     4

     5

#ifndef BLITTER_32BPP_BASE_HPP

     6

#define BLITTER_32BPP_BASE_HPP

     7

     8

#include "base.hpp"

     9

    10

class Blitter_32bppBase : public Blitter {

    11

public:

    12

	/* virtual */ uint8 GetScreenDepth() { return 32; }

    13

//	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);

    14

//	/* virtual */ void DrawColorMappingRect(void *dst, int width, int height, int pal);

    15

//	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);

    16

	/* virtual */ void *MoveTo(const void *video, int x, int y);

    17

	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);

    18

	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);

    19

	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);

    20

	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);

    21

	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);

    22

	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);

    23

	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);

    24

	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);

    25

	/* virtual */ int BufferSize(int width, int height);

    26

	/* virtual */ void PaletteAnimate(uint start, uint count);

    27

	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();

    28

    29

	/**

    30

	 * Compose a colour based on RGB values.

    31

	 */

    32

	static inline uint ComposeColour(uint a, uint r, uint g, uint b)

    33

	{

    34

		return (((a) << 24) & 0xFF000000) | (((r) << 16) & 0x00FF0000) | (((g) << 8) & 0x0000FF00) | ((b) & 0x000000FF);

    35

	}

    36

    37

	/**

    38

	 * Look up the colour in the current palette.

    39

	 **/

    40

	static inline uint32 LookupColourInPalette(uint8 index)

    41

	{

    42

		if (index == 0) return 0x00000000; // Full transparent pixel */

    43

		return ComposeColour(0xFF, _cur_palette[index].r, _cur_palette[index].g, _cur_palette[index].b);

    44

	}

    45

    46

	/**

    47

	 * Compose a colour based on RGBA values and the current pixel value.

    48

	 */

    49

	static inline uint ComposeColourRGBA(uint r, uint g, uint b, uint a, uint current)

    50

	{

    51

		if (a == 0) return current;

    52

		if (a >= 255) return ComposeColour(0xFF, r, g, b);

    53

    54

		uint cr, cg, cb;

    55

		cr = GB(current, 16, 8);

    56

		cg = GB(current, 8,  8);

    57

		cb = GB(current, 0,  8);

    58

    59

		/* The 256 is wrong, it should be 255, but 256 is much faster... */

    60

		return ComposeColour(0xFF,

    61

												(r * a + cr * (256 - a)) / 256,

    62

												(g * a + cg * (256 - a)) / 256,

    63

												(b * a + cb * (256 - a)) / 256);

    64

	}

    65

    66

	/**

    67

	* Compose a colour based on Pixel value, alpha value, and the current pixel value.

    68

	*/

    69

	static inline uint ComposeColourPA(uint colour, uint a, uint current)

    70

	{

    71

		if (a == 0) return current;

    72

		if (a >= 255) return (colour | 0xFF000000);

    73

    74

		uint r, g, b, cr, cg, cb;

    75

		r  = GB(colour,  16, 8);

    76

		g  = GB(colour,  8,  8);

    77

		b  = GB(colour,  0,  8);

    78

		cr = GB(current, 16, 8);

    79

		cg = GB(current, 8,  8);

    80

		cb = GB(current, 0,  8);

    81

    82

		/* The 256 is wrong, it should be 255, but 256 is much faster... */

    83

		return ComposeColour(0xFF,

    84

												(r * a + cr * (256 - a)) / 256,

    85

												(g * a + cg * (256 - a)) / 256,

    86

												(b * a + cb * (256 - a)) / 256);

    87

	}

    88

    89

	/**

    90

	* Make a pixel looks like it is transparent.

    91

	* @param colour the colour already on the screen.

    92

	* @param amount the amount of transparency, times 256.

    93

	* @return the new colour for the screen.

    94

	*/

    95

	static inline uint MakeTransparent(uint colour, uint amount)

    96

	{

    97

		uint r, g, b;

    98

		r = GB(colour, 16, 8);

    99

		g = GB(colour, 8,  8);

   100

		b = GB(colour, 0,  8);

   101

   102

		return ComposeColour(0xFF, r * amount / 256, g * amount / 256, b * amount / 256);

   103

	}

   104

   105

	/**

   106

	* Make a colour grey-based.

   107

	* @param colour the colour to make grey.

   108

	* @return the new colour, now grey.

   109

	*/

   110

	static inline uint MakeGrey(uint colour)

   111

	{

   112

		uint r, g, b;

   113

		r = GB(colour, 16, 8);

   114

		g = GB(colour, 8,  8);

   115

		b = GB(colour, 0,  8);

   116

   117

		/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then

   118

		*  divide by it to normalize the value to a byte again. See heightmap.cpp for

   119

		*  information about the formula. */

   120

		colour = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;

   121

   122

		return ComposeColour(0xFF, colour, colour, colour);

   123

	}

   124

};

   125

   126

#endif /* BLITTER_32BPP_BASE_HPP */