2 * Generic BitBLT function for frame buffer with packed pixels of any depth.
4 * Copyright (C) June 1999 James Simmons
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
12 * This function copys a image from system memory to video memory. The
13 * image can be a bitmap where each 0 represents the background color and
14 * each 1 represents the foreground color. Great for font handling. It can
15 * also be a color image. This is determined by image_depth. The color image
16 * must be laid out exactly in the same format as the framebuffer. Yes I know
17 * their are cards with hardware that coverts images of various depths to the
18 * framebuffer depth. But not every card has this. All images must be rounded
19 * up to the nearest byte. For example a bitmap 12 bits wide must be two
23 * Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API. This speeds
24 * up the code significantly.
26 * Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
27 * still processed a bit at a time.
29 * Also need to add code to deal with cards endians that are different than
30 * the native cpu endians. I also need to deal with MSB position in the word.
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/string.h>
36 #include <asm/types.h>
41 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
43 #define DPRINTK(fmt, args...)
46 static u32 cfb_tab8
[] = {
47 #if defined(__BIG_ENDIAN)
48 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
49 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
50 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
51 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
52 #elif defined(__LITTLE_ENDIAN)
53 0x00000000,0xff000000,0x00ff0000,0xffff0000,
54 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
55 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
56 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
58 #error FIXME: No endianness??
62 static u32 cfb_tab16
[] = {
63 #if defined(__BIG_ENDIAN)
64 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
65 #elif defined(__LITTLE_ENDIAN)
66 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
68 #error FIXME: No endianness??
72 static u32 cfb_tab32
[] = {
73 0x00000000, 0xffffffff
76 #define FB_WRITEL fb_writel
77 #define FB_READL fb_readl
79 #if defined (__BIG_ENDIAN)
80 #define LEFT_POS(bpp) (32 - bpp)
81 #define SHIFT_HIGH(val, bits) ((val) >> (bits))
82 #define SHIFT_LOW(val, bits) ((val) << (bits))
83 #define BIT_NR(b) (7 - (b))
85 #define LEFT_POS(bpp) (0)
86 #define SHIFT_HIGH(val, bits) ((val) << (bits))
87 #define SHIFT_LOW(val, bits) ((val) >> (bits))
91 static inline void color_imageblit(const struct fb_image
*image
,
92 struct fb_info
*p
, u8 __iomem
*dst1
,
96 /* Draw the penguin */
97 u32 __iomem
*dst
, *dst2
;
98 u32 color
= 0, val
, shift
;
99 int i
, n
, bpp
= p
->var
.bits_per_pixel
;
100 u32 null_bits
= 32 - bpp
;
101 u32
*palette
= (u32
*) p
->pseudo_palette
;
102 const u8
*src
= image
->data
;
104 dst2
= (u32 __iomem
*) dst1
;
105 for (i
= image
->height
; i
--; ) {
107 dst
= (u32 __iomem
*) dst1
;
112 u32 start_mask
= ~(SHIFT_HIGH(~(u32
)0, start_index
));
113 val
= FB_READL(dst
) & start_mask
;
117 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
118 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
)
119 color
= palette
[*src
];
122 color
<<= LEFT_POS(bpp
);
123 val
|= SHIFT_HIGH(color
, shift
);
124 if (shift
>= null_bits
) {
125 FB_WRITEL(val
, dst
++);
127 val
= (shift
== null_bits
) ? 0 :
128 SHIFT_LOW(color
, 32 - shift
);
135 u32 end_mask
= SHIFT_HIGH(~(u32
)0, shift
);
137 FB_WRITEL((FB_READL(dst
) & end_mask
) | val
, dst
);
139 dst1
+= p
->fix
.line_length
;
141 dst2
+= p
->fix
.line_length
;
142 dst1
= (u8 __iomem
*)((long __force
)dst2
& ~(sizeof(u32
) - 1));
144 start_index
+= pitch_index
;
145 start_index
&= 32 - 1;
150 static inline void slow_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
151 u8 __iomem
*dst1
, u32 fgcolor
,
156 u32 shift
, color
= 0, bpp
= p
->var
.bits_per_pixel
;
157 u32 __iomem
*dst
, *dst2
;
158 u32 val
, pitch
= p
->fix
.line_length
;
159 u32 null_bits
= 32 - bpp
;
160 u32 spitch
= (image
->width
+7)/8;
161 const u8
*src
= image
->data
, *s
;
164 dst2
= (u32 __iomem
*) dst1
;
166 for (i
= image
->height
; i
--; ) {
170 dst
= (u32 __iomem
*) dst1
;
173 /* write leading bits */
175 u32 start_mask
= ~(SHIFT_HIGH(~(u32
)0, start_index
));
176 val
= FB_READL(dst
) & start_mask
;
182 color
= (*s
& 1 << (BIT_NR(l
))) ? fgcolor
: bgcolor
;
183 color
<<= LEFT_POS(bpp
);
184 val
|= SHIFT_HIGH(color
, shift
);
186 /* Did the bitshift spill bits to the next long? */
187 if (shift
>= null_bits
) {
188 FB_WRITEL(val
, dst
++);
189 val
= (shift
== null_bits
) ? 0 :
190 SHIFT_LOW(color
,32 - shift
);
194 if (!l
) { l
= 8; s
++; };
197 /* write trailing bits */
199 u32 end_mask
= SHIFT_HIGH(~(u32
)0, shift
);
201 FB_WRITEL((FB_READL(dst
) & end_mask
) | val
, dst
);
208 dst1
= (u8 __iomem
*)((long __force
)dst2
& ~(sizeof(u32
) - 1));
209 start_index
+= pitch_index
;
210 start_index
&= 32 - 1;
217 * fast_imageblit - optimized monochrome color expansion
219 * Only if: bits_per_pixel == 8, 16, or 32
220 * image->width is divisible by pixel/dword (ppw);
221 * fix->line_legth is divisible by 4;
222 * beginning and end of a scanline is dword aligned
224 static inline void fast_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
225 u8 __iomem
*dst1
, u32 fgcolor
,
228 u32 fgx
= fgcolor
, bgx
= bgcolor
, bpp
= p
->var
.bits_per_pixel
;
229 u32 ppw
= 32/bpp
, spitch
= (image
->width
+ 7)/8;
230 u32 bit_mask
, end_mask
, eorx
, shift
;
231 const char *s
= image
->data
, *src
;
248 for (i
= ppw
-1; i
--; ) {
255 bit_mask
= (1 << ppw
) - 1;
257 k
= image
->width
/ppw
;
259 for (i
= image
->height
; i
--; ) {
260 dst
= (u32 __iomem
*) dst1
, shift
= 8; src
= s
;
264 end_mask
= tab
[(*src
>> shift
) & bit_mask
];
265 FB_WRITEL((end_mask
& eorx
)^bgx
, dst
++);
266 if (!shift
) { shift
= 8; src
++; }
268 dst1
+= p
->fix
.line_length
;
273 void cfb_imageblit(struct fb_info
*p
, const struct fb_image
*image
)
275 u32 fgcolor
, bgcolor
, start_index
, bitstart
, pitch_index
= 0;
276 u32 bpl
= sizeof(u32
), bpp
= p
->var
.bits_per_pixel
;
277 u32 width
= image
->width
;
278 u32 dx
= image
->dx
, dy
= image
->dy
;
281 if (p
->state
!= FBINFO_STATE_RUNNING
)
284 bitstart
= (dy
* p
->fix
.line_length
* 8) + (dx
* bpp
);
285 start_index
= bitstart
& (32 - 1);
286 pitch_index
= (p
->fix
.line_length
& (bpl
- 1)) * 8;
289 bitstart
&= ~(bpl
- 1);
290 dst1
= p
->screen_base
+ bitstart
;
292 if (p
->fbops
->fb_sync
)
293 p
->fbops
->fb_sync(p
);
295 if (image
->depth
== 1) {
296 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
297 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
) {
298 fgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->fg_color
];
299 bgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->bg_color
];
301 fgcolor
= image
->fg_color
;
302 bgcolor
= image
->bg_color
;
305 if (32 % bpp
== 0 && !start_index
&& !pitch_index
&&
306 ((width
& (32/bpp
-1)) == 0) &&
307 bpp
>= 8 && bpp
<= 32)
308 fast_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
);
310 slow_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
,
311 start_index
, pitch_index
);
313 color_imageblit(image
, p
, dst1
, start_index
, pitch_index
);
316 EXPORT_SYMBOL(cfb_imageblit
);
318 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
319 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
320 MODULE_LICENSE("GPL");