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/module.h>
33 #include <linux/string.h>
35 #include <asm/types.h>
41 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args)
43 #define DPRINTK(fmt, args...)
46 static const u32 cfb_tab8_be
[] = {
47 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
48 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
49 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
50 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
53 static const u32 cfb_tab8_le
[] = {
54 0x00000000,0xff000000,0x00ff0000,0xffff0000,
55 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
56 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
57 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
60 static const u32 cfb_tab16_be
[] = {
61 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
64 static const u32 cfb_tab16_le
[] = {
65 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
68 static const u32 cfb_tab32
[] = {
69 0x00000000, 0xffffffff
72 #define FB_WRITEL fb_writel
73 #define FB_READL fb_readl
75 static inline void color_imageblit(const struct fb_image
*image
,
76 struct fb_info
*p
, u8 __iomem
*dst1
,
80 /* Draw the penguin */
81 u32 __iomem
*dst
, *dst2
;
82 u32 color
= 0, val
, shift
;
83 int i
, n
, bpp
= p
->var
.bits_per_pixel
;
84 u32 null_bits
= 32 - bpp
;
85 u32
*palette
= (u32
*) p
->pseudo_palette
;
86 const u8
*src
= image
->data
;
87 u32 bswapmask
= fb_compute_bswapmask(p
);
89 dst2
= (u32 __iomem
*) dst1
;
90 for (i
= image
->height
; i
--; ) {
92 dst
= (u32 __iomem
*) dst1
;
97 u32 start_mask
= ~fb_shifted_pixels_mask_u32(p
,
98 start_index
, bswapmask
);
99 val
= FB_READL(dst
) & start_mask
;
103 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
104 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
)
105 color
= palette
[*src
];
108 color
<<= FB_LEFT_POS(p
, bpp
);
109 val
|= FB_SHIFT_HIGH(p
, color
, shift
^ bswapmask
);
110 if (shift
>= null_bits
) {
111 FB_WRITEL(val
, dst
++);
113 val
= (shift
== null_bits
) ? 0 :
114 FB_SHIFT_LOW(p
, color
, 32 - shift
);
121 u32 end_mask
= fb_shifted_pixels_mask_u32(p
, shift
,
124 FB_WRITEL((FB_READL(dst
) & end_mask
) | val
, dst
);
126 dst1
+= p
->fix
.line_length
;
128 dst2
+= p
->fix
.line_length
;
129 dst1
= (u8 __iomem
*)((long __force
)dst2
& ~(sizeof(u32
) - 1));
131 start_index
+= pitch_index
;
132 start_index
&= 32 - 1;
137 static inline void slow_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
138 u8 __iomem
*dst1
, u32 fgcolor
,
143 u32 shift
, color
= 0, bpp
= p
->var
.bits_per_pixel
;
144 u32 __iomem
*dst
, *dst2
;
145 u32 val
, pitch
= p
->fix
.line_length
;
146 u32 null_bits
= 32 - bpp
;
147 u32 spitch
= (image
->width
+7)/8;
148 const u8
*src
= image
->data
, *s
;
150 u32 bswapmask
= fb_compute_bswapmask(p
);
152 dst2
= (u32 __iomem
*) dst1
;
153 fgcolor
<<= FB_LEFT_POS(p
, bpp
);
154 bgcolor
<<= FB_LEFT_POS(p
, bpp
);
156 for (i
= image
->height
; i
--; ) {
160 dst
= (u32 __iomem
*) dst1
;
163 /* write leading bits */
165 u32 start_mask
= ~fb_shifted_pixels_mask_u32(p
,
166 start_index
, bswapmask
);
167 val
= FB_READL(dst
) & start_mask
;
173 color
= (*s
& (1 << l
)) ? fgcolor
: bgcolor
;
174 val
|= FB_SHIFT_HIGH(p
, color
, shift
^ bswapmask
);
176 /* Did the bitshift spill bits to the next long? */
177 if (shift
>= null_bits
) {
178 FB_WRITEL(val
, dst
++);
179 val
= (shift
== null_bits
) ? 0 :
180 FB_SHIFT_LOW(p
, color
, 32 - shift
);
184 if (!l
) { l
= 8; s
++; };
187 /* write trailing bits */
189 u32 end_mask
= fb_shifted_pixels_mask_u32(p
, shift
,
192 FB_WRITEL((FB_READL(dst
) & end_mask
) | val
, dst
);
199 dst1
= (u8 __iomem
*)((long __force
)dst2
& ~(sizeof(u32
) - 1));
200 start_index
+= pitch_index
;
201 start_index
&= 32 - 1;
208 * fast_imageblit - optimized monochrome color expansion
210 * Only if: bits_per_pixel == 8, 16, or 32
211 * image->width is divisible by pixel/dword (ppw);
212 * fix->line_legth is divisible by 4;
213 * beginning and end of a scanline is dword aligned
215 static inline void fast_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
216 u8 __iomem
*dst1
, u32 fgcolor
,
219 u32 fgx
= fgcolor
, bgx
= bgcolor
, bpp
= p
->var
.bits_per_pixel
;
220 u32 ppw
= 32/bpp
, spitch
= (image
->width
+ 7)/8;
221 u32 bit_mask
, end_mask
, eorx
, shift
;
222 const char *s
= image
->data
, *src
;
224 const u32
*tab
= NULL
;
229 tab
= fb_be_math(p
) ? cfb_tab8_be
: cfb_tab8_le
;
232 tab
= fb_be_math(p
) ? cfb_tab16_be
: cfb_tab16_le
;
240 for (i
= ppw
-1; i
--; ) {
247 bit_mask
= (1 << ppw
) - 1;
249 k
= image
->width
/ppw
;
251 for (i
= image
->height
; i
--; ) {
252 dst
= (u32 __iomem
*) dst1
, shift
= 8; src
= s
;
256 end_mask
= tab
[(*src
>> shift
) & bit_mask
];
257 FB_WRITEL((end_mask
& eorx
)^bgx
, dst
++);
258 if (!shift
) { shift
= 8; src
++; }
260 dst1
+= p
->fix
.line_length
;
265 void cfb_imageblit(struct fb_info
*p
, const struct fb_image
*image
)
267 u32 fgcolor
, bgcolor
, start_index
, bitstart
, pitch_index
= 0;
268 u32 bpl
= sizeof(u32
), bpp
= p
->var
.bits_per_pixel
;
269 u32 width
= image
->width
;
270 u32 dx
= image
->dx
, dy
= image
->dy
;
273 if (p
->state
!= FBINFO_STATE_RUNNING
)
276 bitstart
= (dy
* p
->fix
.line_length
* 8) + (dx
* bpp
);
277 start_index
= bitstart
& (32 - 1);
278 pitch_index
= (p
->fix
.line_length
& (bpl
- 1)) * 8;
281 bitstart
&= ~(bpl
- 1);
282 dst1
= p
->screen_base
+ bitstart
;
284 if (p
->fbops
->fb_sync
)
285 p
->fbops
->fb_sync(p
);
287 if (image
->depth
== 1) {
288 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
289 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
) {
290 fgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->fg_color
];
291 bgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->bg_color
];
293 fgcolor
= image
->fg_color
;
294 bgcolor
= image
->bg_color
;
297 if (32 % bpp
== 0 && !start_index
&& !pitch_index
&&
298 ((width
& (32/bpp
-1)) == 0) &&
299 bpp
>= 8 && bpp
<= 32)
300 fast_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
);
302 slow_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
,
303 start_index
, pitch_index
);
305 color_imageblit(image
, p
, dst1
, start_index
, pitch_index
);
308 EXPORT_SYMBOL(cfb_imageblit
);
310 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
311 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
312 MODULE_LICENSE("GPL");
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