| /* |
| * Generic BitBLT function for frame buffer with packed pixels of any depth. |
| * |
| * Copyright (C) June 1999 James Simmons |
| * |
| * 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. |
| * |
| * NOTES: |
| * |
| * This function copys a image from system memory to video memory. The |
| * image can be a bitmap where each 0 represents the background color and |
| * each 1 represents the foreground color. Great for font handling. It can |
| * also be a color image. This is determined by image_depth. The color image |
| * must be laid out exactly in the same format as the framebuffer. Yes I know |
| * their are cards with hardware that coverts images of various depths to the |
| * framebuffer depth. But not every card has this. All images must be rounded |
| * up to the nearest byte. For example a bitmap 12 bits wide must be two |
| * bytes width. |
| * |
| * FIXME |
| * The code for 24 bit is horrible. It copies byte by byte size instead of |
| * longs like the other sizes. Needs to be optimized. |
| * |
| * Tony: |
| * Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API. This speeds |
| * up the code significantly. |
| * |
| * Code for depths not multiples of BITS_PER_LONG is still kludgy, which is |
| * still processed a bit at a time. |
| * |
| * Also need to add code to deal with cards endians that are different than |
| * the native cpu endians. I also need to deal with MSB position in the word. |
| * |
| */ |
| #include <linux/config.h> |
| #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,__FUNCTION__,## args) |
| #else |
| #define DPRINTK(fmt, args...) |
| #endif |
| |
| static u32 cfb_tab8[] = { |
| #if defined(__BIG_ENDIAN) |
| 0x00000000,0x000000ff,0x0000ff00,0x0000ffff, |
| 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff, |
| 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff, |
| 0xffff0000,0xffff00ff,0xffffff00,0xffffffff |
| #elif defined(__LITTLE_ENDIAN) |
| 0x00000000,0xff000000,0x00ff0000,0xffff0000, |
| 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00, |
| 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff, |
| 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff |
| #else |
| #error FIXME: No endianness?? |
| #endif |
| }; |
| |
| static u32 cfb_tab16[] = { |
| #if defined(__BIG_ENDIAN) |
| 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff |
| #elif defined(__LITTLE_ENDIAN) |
| 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff |
| #else |
| #error FIXME: No endianness?? |
| #endif |
| }; |
| |
| static u32 cfb_tab32[] = { |
| 0x00000000, 0xffffffff |
| }; |
| |
| #if BITS_PER_LONG == 32 |
| #define FB_WRITEL fb_writel |
| #define FB_READL fb_readl |
| #else |
| #define FB_WRITEL fb_writeq |
| #define FB_READL fb_readq |
| #endif |
| |
| #if defined (__BIG_ENDIAN) |
| #define LEFT_POS(bpp) (BITS_PER_LONG - bpp) |
| #define NEXT_POS(pos, bpp) ((pos) -= (bpp)) |
| #define SHIFT_HIGH(val, bits) ((val) >> (bits)) |
| #define SHIFT_LOW(val, bits) ((val) << (bits)) |
| #else |
| #define LEFT_POS(bpp) (0) |
| #define NEXT_POS(pos, bpp) ((pos) += (bpp)) |
| #define SHIFT_HIGH(val, bits) ((val) << (bits)) |
| #define SHIFT_LOW(val, bits) ((val) >> (bits)) |
| #endif |
| |
| static inline void color_imageblit(struct fb_image *image, struct fb_info *p, u8 *dst1, |
| unsigned long start_index, unsigned long pitch_index) |
| { |
| /* Draw the penguin */ |
| unsigned long *dst, *dst2, color = 0, val, shift; |
| int i, n, bpp = p->var.bits_per_pixel; |
| unsigned long null_bits = BITS_PER_LONG - bpp; |
| u32 *palette = (u32 *) p->pseudo_palette; |
| u8 *src = image->data; |
| |
| dst2 = (unsigned long *) dst1; |
| for (i = image->height; i--; ) { |
| n = image->width; |
| dst = (unsigned long *) dst1; |
| shift = 0; |
| val = 0; |
| |
| if (start_index) { |
| unsigned long start_mask = ~(SHIFT_HIGH(~0UL, start_index)); |
| |
| val = FB_READL(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 <<= LEFT_POS(bpp); |
| val |= SHIFT_HIGH(color, shift); |
| if (shift >= null_bits) { |
| FB_WRITEL(val, dst++); |
| if (shift == null_bits) |
| val = 0; |
| else |
| val = SHIFT_LOW(color, BITS_PER_LONG - shift); |
| } |
| shift += bpp; |
| shift &= (BITS_PER_LONG - 1); |
| src++; |
| } |
| if (shift) { |
| unsigned long end_mask = SHIFT_HIGH(~0UL, shift); |
| |
| FB_WRITEL((FB_READL(dst) & end_mask) | val, dst); |
| } |
| dst1 += p->fix.line_length; |
| if (pitch_index) { |
| dst2 += p->fix.line_length; |
| dst1 = (char *) dst2; |
| (unsigned long) dst1 &= ~(sizeof(unsigned long) - 1); |
| |
| start_index += pitch_index; |
| start_index &= BITS_PER_LONG - 1; |
| } |
| } |
| } |
| |
| static inline void slow_imageblit(struct fb_image *image, struct fb_info *p, u8 *dst1, |
| unsigned long fgcolor, unsigned long bgcolor, |
| unsigned long start_index, unsigned long pitch_index) |
| { |
| unsigned long i, j, l = 8; |
| unsigned long shift, color, bpp = p->var.bits_per_pixel; |
| unsigned long *dst, *dst2, val, pitch = p->fix.line_length; |
| unsigned long null_bits = BITS_PER_LONG - bpp; |
| u8 *src = image->data; |
| |
| dst2 = (unsigned long *) dst1; |
| |
| for (i = image->height; i--; ) { |
| shift = 0; |
| val = 0; |
| j = image->width; |
| dst = (unsigned long *) dst1; |
| |
| /* write leading bits */ |
| if (start_index) { |
| unsigned long start_mask = ~(SHIFT_HIGH(~0UL, start_index)); |
| |
| val = FB_READL(dst) & start_mask; |
| shift = start_index; |
| } |
| while (j--) { |
| l--; |
| if (*src & (1 << l)) |
| color = fgcolor; |
| else |
| color = bgcolor; |
| color <<= LEFT_POS(bpp); |
| val |= SHIFT_HIGH(color, shift); |
| |
| /* Did the bitshift spill bits to the next long? */ |
| if (shift >= null_bits) { |
| FB_WRITEL(val, dst++); |
| if (shift == null_bits) |
| val = 0; |
| else |
| val = SHIFT_LOW(color, BITS_PER_LONG - shift); |
| } |
| shift += bpp; |
| shift &= (BITS_PER_LONG - 1); |
| if (!l) { l = 8; src++; }; |
| } |
| /* write trailing bits */ |
| if (shift) { |
| unsigned long end_mask = SHIFT_HIGH(~0UL, shift); |
| |
| FB_WRITEL((FB_READL(dst) & end_mask) | val, dst); |
| } |
| dst1 += pitch; |
| |
| if (pitch_index) { |
| dst2 += pitch; |
| dst1 = (char *) dst2; |
| (unsigned long) dst1 &= ~(sizeof(unsigned long) - 1); |
| |
| start_index += pitch_index; |
| start_index &= BITS_PER_LONG - 1; |
| } |
| |
| } |
| } |
| |
| static inline void fast_imageblit(struct fb_image *image, struct fb_info *p, u8 *dst1, |
| unsigned long fgcolor, unsigned long bgcolor) |
| { |
| int i, j, k, l = 8, n; |
| unsigned long bit_mask, end_mask, eorx; |
| unsigned long fgx = fgcolor, bgx = bgcolor, pad, bpp = p->var.bits_per_pixel; |
| unsigned long tmp = (1 << bpp) - 1; |
| unsigned long ppw = BITS_PER_LONG/bpp, ppos; |
| unsigned long *dst; |
| u32 *tab = NULL; |
| char *src = image->data; |
| |
| switch (ppw) { |
| case 4: |
| tab = cfb_tab8; |
| break; |
| case 2: |
| tab = cfb_tab16; |
| break; |
| case 1: |
| tab = cfb_tab32; |
| break; |
| } |
| |
| for (i = ppw-1; i--; ) { |
| fgx <<= bpp; |
| bgx <<= bpp; |
| fgx |= fgcolor; |
| bgx |= bgcolor; |
| } |
| |
| n = ((image->width + 7) / 8); |
| pad = (n * 8) - image->width; |
| n = image->width % ppw; |
| |
| bit_mask = (1 << ppw) - 1; |
| eorx = fgx ^ bgx; |
| |
| k = image->width/ppw; |
| |
| for (i = image->height; i--; ) { |
| dst = (unsigned long *) dst1; |
| |
| for (j = k; j--; ) { |
| l -= ppw; |
| end_mask = tab[(*src >> l) & bit_mask]; |
| FB_WRITEL((end_mask & eorx)^bgx, dst++); |
| if (!l) { l = 8; src++; } |
| } |
| if (n) { |
| end_mask = 0; |
| ppos = LEFT_POS(bpp); |
| for (j = n; j > 0; j--) { |
| l--; |
| if (*src & (1 << l)) |
| end_mask |= tmp << ppos; |
| NEXT_POS(ppos, bpp); |
| if (!l) { l = 8; src++; } |
| } |
| FB_WRITEL((end_mask & eorx)^bgx, dst++); |
| } |
| l -= pad; |
| dst1 += p->fix.line_length; |
| } |
| } |
| |
| void cfb_imageblit(struct fb_info *p, struct fb_image *image) |
| { |
| int x2, y2, vxres, vyres; |
| unsigned long fgcolor, bgcolor, start_index, bitstart, pitch_index = 0; |
| unsigned long bpl = sizeof(unsigned long), bpp = p->var.bits_per_pixel; |
| u8 *dst1; |
| |
| vxres = p->var.xres_virtual; |
| vyres = p->var.yres_virtual; |
| /* |
| * We could use hardware clipping but on many cards you get around hardware |
| * clipping by writing to framebuffer directly like we are doing here. |
| */ |
| if (image->dx > vxres || |
| image->dy > vyres) |
| return; |
| |
| x2 = image->dx + image->width; |
| y2 = image->dy + image->height; |
| image->dx = image->dx > 0 ? image->dx : 0; |
| image->dy = image->dy > 0 ? image->dy : 0; |
| x2 = x2 < vxres ? x2 : vxres; |
| y2 = y2 < vyres ? y2 : vyres; |
| image->width = x2 - image->dx; |
| image->height = y2 - image->dy; |
| |
| bitstart = (image->dy * p->fix.line_length * 8) + (image->dx * bpp); |
| start_index = bitstart & (BITS_PER_LONG - 1); |
| pitch_index = (p->fix.line_length & (bpl - 1)) * 8; |
| |
| bitstart /= 8; |
| bitstart &= ~(bpl - 1); |
| dst1 = p->screen_base + bitstart; |
| |
| 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 (BITS_PER_LONG % bpp == 0 && !start_index && !pitch_index && |
| bpp >= 8 && bpp <= 32 && (image->width & 7) == 0) |
| fast_imageblit(image, p, dst1, fgcolor, bgcolor); |
| else |
| slow_imageblit(image, p, dst1, fgcolor, bgcolor, start_index, pitch_index); |
| } |
| else if (image->depth == bpp) |
| color_imageblit(image, p, dst1, start_index, pitch_index); |
| } |
| |
| EXPORT_SYMBOL(cfb_imageblit); |
| |
| MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>"); |
| MODULE_DESCRIPTION("Generic software accelerated imaging drawing"); |
| MODULE_LICENSE("GPL"); |
| |