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321 lines
8.3 KiB
321 lines
8.3 KiB
/*
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* Generic BitBLT function for frame buffer with packed pixels of any depth.
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*
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* Copyright (C) June 1999 James Simmons
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* NOTES:
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*
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* This function copys a image from system memory to video memory. The
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* image can be a bitmap where each 0 represents the background color and
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* each 1 represents the foreground color. Great for font handling. It can
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* also be a color image. This is determined by image_depth. The color image
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* must be laid out exactly in the same format as the framebuffer. Yes I know
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* their are cards with hardware that coverts images of various depths to the
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* framebuffer depth. But not every card has this. All images must be rounded
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* up to the nearest byte. For example a bitmap 12 bits wide must be two
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* bytes width.
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*
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* Tony:
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* Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API. This speeds
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* up the code significantly.
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*
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* Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
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* still processed a bit at a time.
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*
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* Also need to add code to deal with cards endians that are different than
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* the native cpu endians. I also need to deal with MSB position in the word.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <asm/types.h>
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#define DEBUG
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#ifdef DEBUG
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#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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static u32 cfb_tab8[] = {
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#if defined(__BIG_ENDIAN)
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0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
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0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
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0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
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0xffff0000,0xffff00ff,0xffffff00,0xffffffff
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#elif defined(__LITTLE_ENDIAN)
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0x00000000,0xff000000,0x00ff0000,0xffff0000,
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0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
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0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
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0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
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#else
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#error FIXME: No endianness??
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#endif
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};
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static u32 cfb_tab16[] = {
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#if defined(__BIG_ENDIAN)
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0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
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#elif defined(__LITTLE_ENDIAN)
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0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
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#else
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#error FIXME: No endianness??
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#endif
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};
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static u32 cfb_tab32[] = {
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0x00000000, 0xffffffff
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};
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#define FB_WRITEL fb_writel
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#define FB_READL fb_readl
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#if defined (__BIG_ENDIAN)
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#define LEFT_POS(bpp) (32 - bpp)
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#define SHIFT_HIGH(val, bits) ((val) >> (bits))
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#define SHIFT_LOW(val, bits) ((val) << (bits))
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#define BIT_NR(b) (7 - (b))
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#else
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#define LEFT_POS(bpp) (0)
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#define SHIFT_HIGH(val, bits) ((val) << (bits))
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#define SHIFT_LOW(val, bits) ((val) >> (bits))
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#define BIT_NR(b) (b)
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#endif
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static inline void color_imageblit(const struct fb_image *image,
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struct fb_info *p, u8 __iomem *dst1,
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u32 start_index,
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u32 pitch_index)
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{
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/* Draw the penguin */
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u32 __iomem *dst, *dst2;
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u32 color = 0, val, shift;
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int i, n, bpp = p->var.bits_per_pixel;
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u32 null_bits = 32 - bpp;
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u32 *palette = (u32 *) p->pseudo_palette;
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const u8 *src = image->data;
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dst2 = (u32 __iomem *) dst1;
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for (i = image->height; i--; ) {
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n = image->width;
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dst = (u32 __iomem *) dst1;
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shift = 0;
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val = 0;
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if (start_index) {
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u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
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val = FB_READL(dst) & start_mask;
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shift = start_index;
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}
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while (n--) {
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if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
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p->fix.visual == FB_VISUAL_DIRECTCOLOR )
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color = palette[*src];
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else
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color = *src;
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color <<= LEFT_POS(bpp);
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val |= SHIFT_HIGH(color, shift);
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if (shift >= null_bits) {
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FB_WRITEL(val, dst++);
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val = (shift == null_bits) ? 0 :
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SHIFT_LOW(color, 32 - shift);
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}
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shift += bpp;
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shift &= (32 - 1);
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src++;
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}
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if (shift) {
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u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
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FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
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}
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dst1 += p->fix.line_length;
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if (pitch_index) {
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dst2 += p->fix.line_length;
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dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
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start_index += pitch_index;
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start_index &= 32 - 1;
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}
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}
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}
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static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
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u8 __iomem *dst1, u32 fgcolor,
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u32 bgcolor,
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u32 start_index,
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u32 pitch_index)
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{
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u32 shift, color = 0, bpp = p->var.bits_per_pixel;
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u32 __iomem *dst, *dst2;
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u32 val, pitch = p->fix.line_length;
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u32 null_bits = 32 - bpp;
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u32 spitch = (image->width+7)/8;
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const u8 *src = image->data, *s;
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u32 i, j, l;
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dst2 = (u32 __iomem *) dst1;
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for (i = image->height; i--; ) {
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shift = val = 0;
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l = 8;
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j = image->width;
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dst = (u32 __iomem *) dst1;
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s = src;
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/* write leading bits */
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if (start_index) {
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u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
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val = FB_READL(dst) & start_mask;
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shift = start_index;
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}
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while (j--) {
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l--;
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color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor;
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color <<= LEFT_POS(bpp);
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val |= SHIFT_HIGH(color, shift);
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/* Did the bitshift spill bits to the next long? */
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if (shift >= null_bits) {
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FB_WRITEL(val, dst++);
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val = (shift == null_bits) ? 0 :
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SHIFT_LOW(color,32 - shift);
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}
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shift += bpp;
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shift &= (32 - 1);
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if (!l) { l = 8; s++; };
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}
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/* write trailing bits */
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if (shift) {
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u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
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FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
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}
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dst1 += pitch;
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src += spitch;
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if (pitch_index) {
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dst2 += pitch;
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dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
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start_index += pitch_index;
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start_index &= 32 - 1;
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}
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}
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}
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/*
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* fast_imageblit - optimized monochrome color expansion
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*
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* Only if: bits_per_pixel == 8, 16, or 32
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* image->width is divisible by pixel/dword (ppw);
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* fix->line_legth is divisible by 4;
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* beginning and end of a scanline is dword aligned
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*/
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static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
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u8 __iomem *dst1, u32 fgcolor,
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u32 bgcolor)
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{
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u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
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u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
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u32 bit_mask, end_mask, eorx, shift;
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const char *s = image->data, *src;
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u32 __iomem *dst;
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u32 *tab = NULL;
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int i, j, k;
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switch (bpp) {
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case 8:
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tab = cfb_tab8;
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break;
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case 16:
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tab = cfb_tab16;
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break;
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case 32:
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tab = cfb_tab32;
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break;
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}
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for (i = ppw-1; i--; ) {
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fgx <<= bpp;
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bgx <<= bpp;
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fgx |= fgcolor;
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bgx |= bgcolor;
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}
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bit_mask = (1 << ppw) - 1;
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eorx = fgx ^ bgx;
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k = image->width/ppw;
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for (i = image->height; i--; ) {
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dst = (u32 __iomem *) dst1, shift = 8; src = s;
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for (j = k; j--; ) {
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shift -= ppw;
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end_mask = tab[(*src >> shift) & bit_mask];
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FB_WRITEL((end_mask & eorx)^bgx, dst++);
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if (!shift) { shift = 8; src++; }
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}
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dst1 += p->fix.line_length;
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s += spitch;
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}
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}
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void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
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{
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u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
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u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
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u32 width = image->width;
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u32 dx = image->dx, dy = image->dy;
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u8 __iomem *dst1;
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if (p->state != FBINFO_STATE_RUNNING)
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return;
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bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
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start_index = bitstart & (32 - 1);
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pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
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bitstart /= 8;
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bitstart &= ~(bpl - 1);
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dst1 = p->screen_base + bitstart;
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if (p->fbops->fb_sync)
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p->fbops->fb_sync(p);
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if (image->depth == 1) {
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if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
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p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
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fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
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bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
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} else {
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fgcolor = image->fg_color;
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bgcolor = image->bg_color;
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}
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if (32 % bpp == 0 && !start_index && !pitch_index &&
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((width & (32/bpp-1)) == 0) &&
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bpp >= 8 && bpp <= 32)
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fast_imageblit(image, p, dst1, fgcolor, bgcolor);
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else
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slow_imageblit(image, p, dst1, fgcolor, bgcolor,
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start_index, pitch_index);
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} else
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color_imageblit(image, p, dst1, start_index, pitch_index);
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}
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EXPORT_SYMBOL(cfb_imageblit);
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MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
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MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
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MODULE_LICENSE("GPL");
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