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, eorx, shift;
192 const char *s = image->data, *src;
201 tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
205 tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
216 for (i = ppw-1; i--; ) {
223 bit_mask = (1 << ppw) - 1;
225 k = image->width/ppw;
227 for (i = 0; i < tablen; ++i)
228 colortab[i] = (tab[i] & eorx) ^ bgx;
230 for (i = image->height; i--; ) {
236 * Manually unroll the per-line copying loop for better
237 * performance. This works until we processed the last
238 * completely filled source byte (inclusive).
242 for (j = k; j >= 2; j -= 2, ++src) {
243 *dst++ = colortab[(*src >> 4) & bit_mask];
244 *dst++ = colortab[(*src >> 0) & bit_mask];
248 for (j = k; j >= 4; j -= 4, ++src) {
249 *dst++ = colortab[(*src >> 6) & bit_mask];
250 *dst++ = colortab[(*src >> 4) & bit_mask];
251 *dst++ = colortab[(*src >> 2) & bit_mask];
252 *dst++ = colortab[(*src >> 0) & bit_mask];
256 for (j = k; j >= 8; j -= 8, ++src) {
257 *dst++ = colortab[(*src >> 7) & bit_mask];
258 *dst++ = colortab[(*src >> 6) & bit_mask];
259 *dst++ = colortab[(*src >> 5) & bit_mask];
260 *dst++ = colortab[(*src >> 4) & bit_mask];
261 *dst++ = colortab[(*src >> 3) & bit_mask];
262 *dst++ = colortab[(*src >> 2) & bit_mask];
263 *dst++ = colortab[(*src >> 1) & bit_mask];
264 *dst++ = colortab[(*src >> 0) & bit_mask];
270 * For image widths that are not a multiple of 8, there
271 * are trailing pixels left on the current line. Print
276 *dst++ = colortab[(*src >> shift) & bit_mask];
283 dst1 += p->fix.line_length;
288 void sys_imageblit(struct fb_info *p, const struct fb_image *image)
290 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
291 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
292 u32 width = image->width;
293 u32 dx = image->dx, dy = image->dy;
296 if (p->state != FBINFO_STATE_RUNNING)
299 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
300 start_index = bitstart & (32 - 1);
301 pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
304 bitstart &= ~(bpl - 1);
305 dst1 = (void __force *)p->screen_base + bitstart;
307 if (p->fbops->fb_sync)
308 p->fbops->fb_sync(p);
310 if (image->depth == 1) {
311 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
312 p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
313 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
314 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
316 fgcolor = image->fg_color;
317 bgcolor = image->bg_color;
320 if (32 % bpp == 0 && !start_index && !pitch_index &&
321 ((width & (32/bpp-1)) == 0) &&
322 bpp >= 8 && bpp <= 32)
323 fast_imageblit(image, p, dst1, fgcolor, bgcolor);
325 slow_imageblit(image, p, dst1, fgcolor, bgcolor,
326 start_index, pitch_index);
328 color_imageblit(image, p, dst1, start_index, pitch_index);
331 EXPORT_SYMBOL(sys_imageblit);
333 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
334 MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
335 MODULE_LICENSE("GPL");