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path: root/drivers/video/fbdev/fb_draw.h
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Diffstat (limited to 'drivers/video/fbdev/fb_draw.h')
-rw-r--r--drivers/video/fbdev/fb_draw.h186
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/video/fbdev/fb_draw.h b/drivers/video/fbdev/fb_draw.h
new file mode 100644
index 00000000000..624ee115f12
--- /dev/null
+++ b/drivers/video/fbdev/fb_draw.h
@@ -0,0 +1,186 @@
+#ifndef _FB_DRAW_H
+#define _FB_DRAW_H
+
+#include <asm/types.h>
+#include <linux/fb.h>
+#include <linux/bug.h>
+
+ /*
+ * Compose two values, using a bitmask as decision value
+ * This is equivalent to (a & mask) | (b & ~mask)
+ */
+
+static inline unsigned long
+comp(unsigned long a, unsigned long b, unsigned long mask)
+{
+ return ((a ^ b) & mask) ^ b;
+}
+
+ /*
+ * Create a pattern with the given pixel's color
+ */
+
+#if BITS_PER_LONG == 64
+static inline unsigned long
+pixel_to_pat( u32 bpp, u32 pixel)
+{
+ switch (bpp) {
+ case 1:
+ return 0xfffffffffffffffful*pixel;
+ case 2:
+ return 0x5555555555555555ul*pixel;
+ case 4:
+ return 0x1111111111111111ul*pixel;
+ case 8:
+ return 0x0101010101010101ul*pixel;
+ case 12:
+ return 0x1001001001001001ul*pixel;
+ case 16:
+ return 0x0001000100010001ul*pixel;
+ case 24:
+ return 0x0001000001000001ul*pixel;
+ case 32:
+ return 0x0000000100000001ul*pixel;
+ default:
+ WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
+ return 0;
+ }
+}
+#else
+static inline unsigned long
+pixel_to_pat( u32 bpp, u32 pixel)
+{
+ switch (bpp) {
+ case 1:
+ return 0xfffffffful*pixel;
+ case 2:
+ return 0x55555555ul*pixel;
+ case 4:
+ return 0x11111111ul*pixel;
+ case 8:
+ return 0x01010101ul*pixel;
+ case 12:
+ return 0x01001001ul*pixel;
+ case 16:
+ return 0x00010001ul*pixel;
+ case 24:
+ return 0x01000001ul*pixel;
+ case 32:
+ return 0x00000001ul*pixel;
+ default:
+ WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
+ return 0;
+ }
+}
+#endif
+
+#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
+#if BITS_PER_LONG == 64
+#define REV_PIXELS_MASK1 0x5555555555555555ul
+#define REV_PIXELS_MASK2 0x3333333333333333ul
+#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
+#else
+#define REV_PIXELS_MASK1 0x55555555ul
+#define REV_PIXELS_MASK2 0x33333333ul
+#define REV_PIXELS_MASK4 0x0f0f0f0ful
+#endif
+
+static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
+ u32 bswapmask)
+{
+ if (bswapmask & 1)
+ val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
+ if (bswapmask & 2)
+ val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
+ if (bswapmask & 3)
+ val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
+ return val;
+}
+
+static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
+ u32 bswapmask)
+{
+ u32 mask;
+
+ if (!bswapmask) {
+ mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
+ } else {
+ mask = 0xff << FB_LEFT_POS(p, 8);
+ mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
+ mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
+#if defined(__i386__) || defined(__x86_64__)
+ /* Shift argument is limited to 0 - 31 on x86 based CPU's */
+ if(index + bswapmask < 32)
+#endif
+ mask |= FB_SHIFT_HIGH(p, ~(u32)0,
+ (index + bswapmask) & ~(bswapmask));
+ }
+ return mask;
+}
+
+static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
+ u32 index,
+ u32 bswapmask)
+{
+ unsigned long mask;
+
+ if (!bswapmask) {
+ mask = FB_SHIFT_HIGH(p, ~0UL, index);
+ } else {
+ mask = 0xff << FB_LEFT_POS(p, 8);
+ mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
+ mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
+#if defined(__i386__) || defined(__x86_64__)
+ /* Shift argument is limited to 0 - 31 on x86 based CPU's */
+ if(index + bswapmask < BITS_PER_LONG)
+#endif
+ mask |= FB_SHIFT_HIGH(p, ~0UL,
+ (index + bswapmask) & ~(bswapmask));
+ }
+ return mask;
+}
+
+
+static inline u32 fb_compute_bswapmask(struct fb_info *info)
+{
+ u32 bswapmask = 0;
+ unsigned bpp = info->var.bits_per_pixel;
+
+ if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
+ /*
+ * Reversed order of pixel layout in bytes
+ * works only for 1, 2 and 4 bpp
+ */
+ bswapmask = 7 - bpp + 1;
+ }
+ return bswapmask;
+}
+
+#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
+
+static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
+ u32 bswapmask)
+{
+ return val;
+}
+
+#define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
+#define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
+#define fb_compute_bswapmask(...) 0
+
+#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
+
+#define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
+#define _cpu_to_le_long(x) __cpu_to_le_long(x)
+#define __cpu_to_le_long(x) cpu_to_le##x
+
+#define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
+#define _le_long_to_cpu(x) __le_long_to_cpu(x)
+#define __le_long_to_cpu(x) le##x##_to_cpu
+
+static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
+{
+ return (word << shift) | (word >> (x - shift));
+}
+
+#endif /* FB_DRAW_H */