168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
#ifndef _FB_DRAW_H
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#define _FB_DRAW_H
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#include <asm/types.h>
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#include <linux/fb.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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#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
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#if BITS_PER_LONG == 64
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#define REV_PIXELS_MASK1 0x5555555555555555ul
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#define REV_PIXELS_MASK2 0x3333333333333333ul
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#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
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#else
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#define REV_PIXELS_MASK1 0x55555555ul
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#define REV_PIXELS_MASK2 0x33333333ul
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#define REV_PIXELS_MASK4 0x0f0f0f0ful
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#endif
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static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
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u32 bswapmask)
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{
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if (bswapmask & 1)
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val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
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if (bswapmask & 2)
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val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
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if (bswapmask & 3)
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val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
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return val;
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}
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static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
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{
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u32 mask;
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if (!bswapmask) {
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mask = FB_SHIFT_HIGH(~(u32)0, index);
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} else {
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mask = 0xff << FB_LEFT_POS(8);
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mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
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mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
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#if defined(__i386__) || defined(__x86_64__)
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/* Shift argument is limited to 0 - 31 on x86 based CPU's */
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if(index + bswapmask < 32)
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#endif
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mask |= FB_SHIFT_HIGH(~(u32)0,
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(index + bswapmask) & ~(bswapmask));
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}
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return mask;
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}
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static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
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{
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unsigned long mask;
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if (!bswapmask) {
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mask = FB_SHIFT_HIGH(~0UL, index);
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} else {
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mask = 0xff << FB_LEFT_POS(8);
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mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
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mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
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#if defined(__i386__) || defined(__x86_64__)
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/* Shift argument is limited to 0 - 31 on x86 based CPU's */
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if(index + bswapmask < BITS_PER_LONG)
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#endif
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mask |= FB_SHIFT_HIGH(~0UL,
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(index + bswapmask) & ~(bswapmask));
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}
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return mask;
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}
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static inline u32 fb_compute_bswapmask(struct fb_info *info)
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{
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u32 bswapmask = 0;
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unsigned bpp = info->var.bits_per_pixel;
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if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
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/*
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* Reversed order of pixel layout in bytes
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* works only for 1, 2 and 4 bpp
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*/
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bswapmask = 7 - bpp + 1;
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}
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return bswapmask;
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}
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#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
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static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
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u32 bswapmask)
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{
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return val;
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}
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#define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
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#define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
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#define fb_compute_bswapmask(...) 0
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#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
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#endif /* FB_DRAW_H */
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