2 * Generic 1-bit or 8-bit source to 1-32 bit destination expansion
3 * for frame buffer located in system RAM with packed pixels of any depth.
5 * Based almost entirely on cfbimgblt.c
7 * Copyright (C) April 2007 Antonino Daplas <adaplas@pol.net>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file COPYING in the main directory of this archive for
13 #include <linux/module.h>
14 #include <linux/string.h>
16 #include <asm/types.h>
21 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args)
23 #define DPRINTK(fmt, args...)
26 static const u32 cfb_tab8_be
[] = {
27 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
28 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
29 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
30 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
33 static const u32 cfb_tab8_le
[] = {
34 0x00000000,0xff000000,0x00ff0000,0xffff0000,
35 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
36 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
37 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
40 static const u32 cfb_tab16_be
[] = {
41 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
44 static const u32 cfb_tab16_le
[] = {
45 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
48 static const u32 cfb_tab32
[] = {
49 0x00000000, 0xffffffff
52 static void color_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
53 void *dst1
, u32 start_index
, u32 pitch_index
)
55 /* Draw the penguin */
57 u32 color
= 0, val
, shift
;
58 int i
, n
, bpp
= p
->var
.bits_per_pixel
;
59 u32 null_bits
= 32 - bpp
;
60 u32
*palette
= (u32
*) p
->pseudo_palette
;
61 const u8
*src
= image
->data
;
64 for (i
= image
->height
; i
--; ) {
71 u32 start_mask
= ~(FB_SHIFT_HIGH(p
, ~(u32
)0,
73 val
= *dst
& start_mask
;
77 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
78 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
)
79 color
= palette
[*src
];
82 color
<<= FB_LEFT_POS(p
, bpp
);
83 val
|= FB_SHIFT_HIGH(p
, color
, shift
);
84 if (shift
>= null_bits
) {
87 val
= (shift
== null_bits
) ? 0 :
88 FB_SHIFT_LOW(p
, color
, 32 - shift
);
95 u32 end_mask
= FB_SHIFT_HIGH(p
, ~(u32
)0, shift
);
100 dst1
+= p
->fix
.line_length
;
102 dst2
+= p
->fix
.line_length
;
103 dst1
= (u8
*)((long)dst2
& ~(sizeof(u32
) - 1));
105 start_index
+= pitch_index
;
106 start_index
&= 32 - 1;
111 static void slow_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
112 void *dst1
, u32 fgcolor
, u32 bgcolor
,
113 u32 start_index
, u32 pitch_index
)
115 u32 shift
, color
= 0, bpp
= p
->var
.bits_per_pixel
;
117 u32 val
, pitch
= p
->fix
.line_length
;
118 u32 null_bits
= 32 - bpp
;
119 u32 spitch
= (image
->width
+7)/8;
120 const u8
*src
= image
->data
, *s
;
124 fgcolor
<<= FB_LEFT_POS(p
, bpp
);
125 bgcolor
<<= FB_LEFT_POS(p
, bpp
);
127 for (i
= image
->height
; i
--; ) {
134 /* write leading bits */
136 u32 start_mask
= ~(FB_SHIFT_HIGH(p
, ~(u32
)0,
138 val
= *dst
& start_mask
;
144 color
= (*s
& (1 << l
)) ? fgcolor
: bgcolor
;
145 val
|= FB_SHIFT_HIGH(p
, color
, shift
);
147 /* Did the bitshift spill bits to the next long? */
148 if (shift
>= null_bits
) {
150 val
= (shift
== null_bits
) ? 0 :
151 FB_SHIFT_LOW(p
, color
, 32 - shift
);
155 if (!l
) { l
= 8; s
++; }
158 /* write trailing bits */
160 u32 end_mask
= FB_SHIFT_HIGH(p
, ~(u32
)0, shift
);
170 dst1
= (u8
*)((long)dst2
& ~(sizeof(u32
) - 1));
171 start_index
+= pitch_index
;
172 start_index
&= 32 - 1;
179 * fast_imageblit - optimized monochrome color expansion
181 * Only if: bits_per_pixel == 8, 16, or 32
182 * image->width is divisible by pixel/dword (ppw);
183 * fix->line_legth is divisible by 4;
184 * beginning and end of a scanline is dword aligned
186 static void fast_imageblit(const struct fb_image
*image
, struct fb_info
*p
,
187 void *dst1
, u32 fgcolor
, u32 bgcolor
)
189 u32 fgx
= fgcolor
, bgx
= bgcolor
, bpp
= p
->var
.bits_per_pixel
;
190 u32 ppw
= 32/bpp
, spitch
= (image
->width
+ 7)/8;
191 u32 bit_mask
, end_mask
, eorx
, shift
;
192 const char *s
= image
->data
, *src
;
194 const u32
*tab
= NULL
;
199 tab
= fb_be_math(p
) ? cfb_tab8_be
: cfb_tab8_le
;
202 tab
= fb_be_math(p
) ? cfb_tab16_be
: cfb_tab16_le
;
210 for (i
= ppw
-1; i
--; ) {
217 bit_mask
= (1 << ppw
) - 1;
219 k
= image
->width
/ppw
;
221 for (i
= image
->height
; i
--; ) {
228 end_mask
= tab
[(*src
>> shift
) & bit_mask
];
229 *dst
++ = (end_mask
& eorx
) ^ bgx
;
235 dst1
+= p
->fix
.line_length
;
240 void sys_imageblit(struct fb_info
*p
, const struct fb_image
*image
)
242 u32 fgcolor
, bgcolor
, start_index
, bitstart
, pitch_index
= 0;
243 u32 bpl
= sizeof(u32
), bpp
= p
->var
.bits_per_pixel
;
244 u32 width
= image
->width
;
245 u32 dx
= image
->dx
, dy
= image
->dy
;
248 if (p
->state
!= FBINFO_STATE_RUNNING
)
251 bitstart
= (dy
* p
->fix
.line_length
* 8) + (dx
* bpp
);
252 start_index
= bitstart
& (32 - 1);
253 pitch_index
= (p
->fix
.line_length
& (bpl
- 1)) * 8;
256 bitstart
&= ~(bpl
- 1);
257 dst1
= (void __force
*)p
->screen_base
+ bitstart
;
259 if (p
->fbops
->fb_sync
)
260 p
->fbops
->fb_sync(p
);
262 if (image
->depth
== 1) {
263 if (p
->fix
.visual
== FB_VISUAL_TRUECOLOR
||
264 p
->fix
.visual
== FB_VISUAL_DIRECTCOLOR
) {
265 fgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->fg_color
];
266 bgcolor
= ((u32
*)(p
->pseudo_palette
))[image
->bg_color
];
268 fgcolor
= image
->fg_color
;
269 bgcolor
= image
->bg_color
;
272 if (32 % bpp
== 0 && !start_index
&& !pitch_index
&&
273 ((width
& (32/bpp
-1)) == 0) &&
274 bpp
>= 8 && bpp
<= 32)
275 fast_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
);
277 slow_imageblit(image
, p
, dst1
, fgcolor
, bgcolor
,
278 start_index
, pitch_index
);
280 color_imageblit(image
, p
, dst1
, start_index
, pitch_index
);
283 EXPORT_SYMBOL(sys_imageblit
);
285 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
286 MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
287 MODULE_LICENSE("GPL");