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))
84 #define LEFT_POS(bpp) (0)
85 #define SHIFT_HIGH(val, bits) ((val) << (bits))
86 #define SHIFT_LOW(val, bits) ((val) >> (bits))
89 static inline void color_imageblit(const struct fb_image *image,
90 struct fb_info *p, u8 __iomem *dst1,
94 /* Draw the penguin */
95 u32 __iomem *dst, *dst2;
96 u32 color = 0, val, shift;
97 int i, n, bpp = p->var.bits_per_pixel;
98 u32 null_bits = 32 - bpp;
99 u32 *palette = (u32 *) p->pseudo_palette;
100 const u8 *src = image->data;
102 dst2 = (u32 __iomem *) dst1;
103 for (i = image->height; i--; ) {
105 dst = (u32 __iomem *) dst1;
110 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
111 val = FB_READL(dst) & start_mask;
115 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
116 p->fix.visual == FB_VISUAL_DIRECTCOLOR )
117 color = palette[*src];
120 color <<= LEFT_POS(bpp);
121 val |= SHIFT_HIGH(color, shift);
122 if (shift >= null_bits) {
123 FB_WRITEL(val, dst++);
125 val = (shift == null_bits) ? 0 :
126 SHIFT_LOW(color, 32 - shift);
133 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
135 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
137 dst1 += p->fix.line_length;
139 dst2 += p->fix.line_length;
140 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
142 start_index += pitch_index;
143 start_index &= 32 - 1;
148 static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
149 u8 __iomem *dst1, u32 fgcolor,
154 u32 shift, color = 0, bpp = p->var.bits_per_pixel;
155 u32 __iomem *dst, *dst2;
156 u32 val, pitch = p->fix.line_length;
157 u32 null_bits = 32 - bpp;
158 u32 spitch = (image->width+7)/8;
159 const u8 *src = image->data, *s;
162 dst2 = (u32 __iomem *) dst1;
164 for (i = image->height; i--; ) {
168 dst = (u32 __iomem *) dst1;
171 /* write leading bits */
173 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
174 val = FB_READL(dst) & start_mask;
180 color = (*s & (1 << l)) ? fgcolor : bgcolor;
181 color <<= LEFT_POS(bpp);
182 val |= SHIFT_HIGH(color, shift);
184 /* Did the bitshift spill bits to the next long? */
185 if (shift >= null_bits) {
186 FB_WRITEL(val, dst++);
187 val = (shift == null_bits) ? 0 :
188 SHIFT_LOW(color,32 - shift);
192 if (!l) { l = 8; s++; };
195 /* write trailing bits */
197 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
199 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
206 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
207 start_index += pitch_index;
208 start_index &= 32 - 1;
215 * fast_imageblit - optimized monochrome color expansion
217 * Only if: bits_per_pixel == 8, 16, or 32
218 * image->width is divisible by pixel/dword (ppw);
219 * fix->line_legth is divisible by 4;
220 * beginning and end of a scanline is dword aligned
222 static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
223 u8 __iomem *dst1, u32 fgcolor,
226 u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
227 u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
228 u32 bit_mask, end_mask, eorx, shift;
229 const char *s = image->data, *src;
246 for (i = ppw-1; i--; ) {
253 bit_mask = (1 << ppw) - 1;
255 k = image->width/ppw;
257 for (i = image->height; i--; ) {
258 dst = (u32 __iomem *) dst1, shift = 8; src = s;
262 end_mask = tab[(*src >> shift) & bit_mask];
263 FB_WRITEL((end_mask & eorx)^bgx, dst++);
264 if (!shift) { shift = 8; src++; }
266 dst1 += p->fix.line_length;
271 void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
273 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
274 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
275 u32 width = image->width, height = image->height;
276 u32 dx = image->dx, dy = image->dy;
277 int x2, y2, vxres, vyres;
280 if (p->state != FBINFO_STATE_RUNNING)
283 vxres = p->var.xres_virtual;
284 vyres = p->var.yres_virtual;
286 * We could use hardware clipping but on many cards you get around
287 * hardware clipping by writing to framebuffer directly like we are
290 if (image->dx > vxres || image->dy > vyres)
293 x2 = image->dx + image->width;
294 y2 = image->dy + image->height;
295 dx = image->dx > 0 ? image->dx : 0;
296 dy = image->dy > 0 ? image->dy : 0;
297 x2 = x2 < vxres ? x2 : vxres;
298 y2 = y2 < vyres ? y2 : vyres;
302 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
303 start_index = bitstart & (32 - 1);
304 pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
307 bitstart &= ~(bpl - 1);
308 dst1 = p->screen_base + bitstart;
310 if (p->fbops->fb_sync)
311 p->fbops->fb_sync(p);
313 if (image->depth == 1) {
314 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
315 p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
316 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
317 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
319 fgcolor = image->fg_color;
320 bgcolor = image->bg_color;
323 if (32 % bpp == 0 && !start_index && !pitch_index &&
324 ((width & (32/bpp-1)) == 0) &&
325 bpp >= 8 && bpp <= 32)
326 fast_imageblit(image, p, dst1, fgcolor, bgcolor);
328 slow_imageblit(image, p, dst1, fgcolor, bgcolor,
329 start_index, pitch_index);
331 color_imageblit(image, p, dst1, start_index, pitch_index);
334 EXPORT_SYMBOL(cfb_imageblit);
336 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
337 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
338 MODULE_LICENSE("GPL");