73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
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#ifndef _FB_DRAW_H
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#define _FB_DRAW_H
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#include <asm/types.h>
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/*
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* Compose two values, using a bitmask as decision value
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* This is equivalent to (a & mask) | (b & ~mask)
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*/
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static inline unsigned long
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comp(unsigned long a, unsigned long b, unsigned long mask)
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{
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return ((a ^ b) & mask) ^ b;
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}
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/*
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* Create a pattern with the given pixel's color
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*/
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#if BITS_PER_LONG == 64
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static inline unsigned long
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pixel_to_pat( u32 bpp, u32 pixel)
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{
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switch (bpp) {
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case 1:
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return 0xfffffffffffffffful*pixel;
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case 2:
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return 0x5555555555555555ul*pixel;
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case 4:
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return 0x1111111111111111ul*pixel;
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case 8:
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return 0x0101010101010101ul*pixel;
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case 12:
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return 0x0001001001001001ul*pixel;
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case 16:
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return 0x0001000100010001ul*pixel;
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case 24:
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return 0x0000000001000001ul*pixel;
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case 32:
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return 0x0000000100000001ul*pixel;
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default:
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panic("pixel_to_pat(): unsupported pixelformat\n");
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}
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}
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#else
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static inline unsigned long
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pixel_to_pat( u32 bpp, u32 pixel)
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{
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switch (bpp) {
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case 1:
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return 0xfffffffful*pixel;
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case 2:
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return 0x55555555ul*pixel;
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case 4:
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return 0x11111111ul*pixel;
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case 8:
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return 0x01010101ul*pixel;
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case 12:
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return 0x00001001ul*pixel;
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case 16:
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return 0x00010001ul*pixel;
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case 24:
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return 0x00000001ul*pixel;
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case 32:
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return 0x00000001ul*pixel;
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default:
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panic("pixel_to_pat(): unsupported pixelformat\n");
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}
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}
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#endif
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#endif /* FB_DRAW_H */
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