summaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/core/sysimgblt.c
blob: a4d05b1b17d7da6dfdebcf6c7df3f538cbb982e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 *  Generic 1-bit or 8-bit source to 1-32 bit destination expansion
 *  for frame buffer located in system RAM with packed pixels of any depth.
 *
 *  Based almost entirely on cfbimgblt.c
 *
 *      Copyright (C)  April 2007 Antonino Daplas <adaplas@pol.net>
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <asm/types.h>

#define DEBUG

#ifdef DEBUG
#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args)
#else
#define DPRINTK(fmt, args...)
#endif

static const u32 cfb_tab8_be[] = {
    0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
    0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
    0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
    0xffff0000,0xffff00ff,0xffffff00,0xffffffff
};

static const u32 cfb_tab8_le[] = {
    0x00000000,0xff000000,0x00ff0000,0xffff0000,
    0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
    0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
    0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
};

static const u32 cfb_tab16_be[] = {
    0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
};

static const u32 cfb_tab16_le[] = {
    0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
};

static const u32 cfb_tab32[] = {
	0x00000000, 0xffffffff
};

static void color_imageblit(const struct fb_image *image, struct fb_info *p,
			    void *dst1, u32 start_index, u32 pitch_index)
{
	/* Draw the penguin */
	u32 *dst, *dst2;
	u32 color = 0, val, shift;
	int i, n, bpp = p->var.bits_per_pixel;
	u32 null_bits = 32 - bpp;
	u32 *palette = (u32 *) p->pseudo_palette;
	const u8 *src = image->data;

	dst2 = dst1;
	for (i = image->height; i--; ) {
		n = image->width;
		dst = dst1;
		shift = 0;
		val = 0;

		if (start_index) {
			u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
							 start_index));
			val = *dst & start_mask;
			shift = start_index;
		}
		while (n--) {
			if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
			    p->fix.visual == FB_VISUAL_DIRECTCOLOR )
				color = palette[*src];
			else
				color = *src;
			color <<= FB_LEFT_POS(p, bpp);
			val |= FB_SHIFT_HIGH(p, color, shift);
			if (shift >= null_bits) {
				*dst++ = val;

				val = (shift == null_bits) ? 0 :
					FB_SHIFT_LOW(p, color, 32 - shift);
			}
			shift += bpp;
			shift &= (32 - 1);
			src++;
		}
		if (shift) {
			u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);

			*dst &= end_mask;
			*dst |= val;
		}
		dst1 += p->fix.line_length;
		if (pitch_index) {
			dst2 += p->fix.line_length;
			dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));

			start_index += pitch_index;
			start_index &= 32 - 1;
		}
	}
}

static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
				  void *dst1, u32 fgcolor, u32 bgcolor,
				  u32 start_index, u32 pitch_index)
{
	u32 shift, color = 0, bpp = p->var.bits_per_pixel;
	u32 *dst, *dst2;
	u32 val, pitch = p->fix.line_length;
	u32 null_bits = 32 - bpp;
	u32 spitch = (image->width+7)/8;
	const u8 *src = image->data, *s;
	u32 i, j, l;

	dst2 = dst1;
	fgcolor <<= FB_LEFT_POS(p, bpp);
	bgcolor <<= FB_LEFT_POS(p, bpp);

	for (i = image->height; i--; ) {
		shift = val = 0;
		l = 8;
		j = image->width;
		dst = dst1;
		s = src;

		/* write leading bits */
		if (start_index) {
			u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
							 start_index));
			val = *dst & start_mask;
			shift = start_index;
		}

		while (j--) {
			l--;
			color = (*s & (1 << l)) ? fgcolor : bgcolor;
			val |= FB_SHIFT_HIGH(p, color, shift);

			/* Did the bitshift spill bits to the next long? */
			if (shift >= null_bits) {
				*dst++ = val;
				val = (shift == null_bits) ? 0 :
					FB_SHIFT_LOW(p, color, 32 - shift);
			}
			shift += bpp;
			shift &= (32 - 1);
			if (!l) { l = 8; s++; }
		}

		/* write trailing bits */
 		if (shift) {
			u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);

			*dst &= end_mask;
			*dst |= val;
		}

		dst1 += pitch;
		src += spitch;
		if (pitch_index) {
			dst2 += pitch;
			dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
			start_index += pitch_index;
			start_index &= 32 - 1;
		}

	}
}

/*
 * fast_imageblit - optimized monochrome color expansion
 *
 * Only if:  bits_per_pixel == 8, 16, or 32
 *           image->width is divisible by pixel/dword (ppw);
 *           fix->line_legth is divisible by 4;
 *           beginning and end of a scanline is dword aligned
 */
static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
				  void *dst1, u32 fgcolor, u32 bgcolor)
{
	u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
	u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
	u32 bit_mask, end_mask, eorx, shift;
	const char *s = image->data, *src;
	u32 *dst;
	const u32 *tab = NULL;
	int i, j, k;

	switch (bpp) {
	case 8:
		tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
		break;
	case 16:
		tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
		break;
	case 32:
	default:
		tab = cfb_tab32;
		break;
	}

	for (i = ppw-1; i--; ) {
		fgx <<= bpp;
		bgx <<= bpp;
		fgx |= fgcolor;
		bgx |= bgcolor;
	}

	bit_mask = (1 << ppw) - 1;
	eorx = fgx ^ bgx;
	k = image->width/ppw;

	for (i = image->height; i--; ) {
		dst = dst1;
		shift = 8;
		src = s;

		for (j = k; j--; ) {
			shift -= ppw;
			end_mask = tab[(*src >> shift) & bit_mask];
			*dst++ = (end_mask & eorx) ^ bgx;
			if (!shift) {
				shift = 8;
				src++;
			}
		}
		dst1 += p->fix.line_length;
		s += spitch;
	}
}

void sys_imageblit(struct fb_info *p, const struct fb_image *image)
{
	u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
	u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
	u32 width = image->width;
	u32 dx = image->dx, dy = image->dy;
	void *dst1;

	if (p->state != FBINFO_STATE_RUNNING)
		return;

	bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
	start_index = bitstart & (32 - 1);
	pitch_index = (p->fix.line_length & (bpl - 1)) * 8;

	bitstart /= 8;
	bitstart &= ~(bpl - 1);
	dst1 = (void __force *)p->screen_base + bitstart;

	if (p->fbops->fb_sync)
		p->fbops->fb_sync(p);

	if (image->depth == 1) {
		if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
		    p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
			fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
			bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
		} else {
			fgcolor = image->fg_color;
			bgcolor = image->bg_color;
		}

		if (32 % bpp == 0 && !start_index && !pitch_index &&
		    ((width & (32/bpp-1)) == 0) &&
		    bpp >= 8 && bpp <= 32)
			fast_imageblit(image, p, dst1, fgcolor, bgcolor);
		else
			slow_imageblit(image, p, dst1, fgcolor, bgcolor,
					start_index, pitch_index);
	} else
		color_imageblit(image, p, dst1, start_index, pitch_index);
}

EXPORT_SYMBOL(sys_imageblit);

MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
MODULE_LICENSE("GPL");