researchv9/X11/src/X.V11R1/server/ddx/cfb/cfbmskbits.h - view

File: [Research Unix] / researchv9 / X11 / src / X.V11R1 / server / ddx / cfb / cfbmskbits.h
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:22:00 2018 UTC (8 years, 1 month ago) by root
Branches: belllabs, MAIN
CVS tags: researchv9-SUN3_old, researchv9-SUN3, HEAD

researchv9-SUN3(old)

/************************************************************ Copyright 1987 by Sun Microsystems, Inc. Mountain View, CA. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright no- tice appear in all copies and that both that copyright no- tice and this permission notice appear in supporting docu- mentation, and that the names of Sun or MIT not be used in advertising or publicity pertaining to distribution of the software without specific prior written permission. Sun and M.I.T. make no representations about the suitability of this software for any purpose. It is provided "as is" without any express or implied warranty. SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT- NESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SUN BE LI- ABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ********************************************************/ /* $Header: /var/lib/cvsd/repos/research/researchv9/X11/src/X.V11R1/server/ddx/cfb/cfbmskbits.h,v 1.1.1.1 2018/04/24 17:22:00 root Exp $ */ extern int cfbstarttab[]; extern int cfbendtab[]; extern int cfbstartpartial[]; extern int cfbendpartial[]; extern int cfbrmask[32]; extern int cfbmask[32]; /* * ========================================================================== * Converted from mfb to support memory-mapped color framebuffer by smarks@sun, * April-May 1987. * * The way I did the conversion was to consider each longword as an * array of four bytes instead of an array of 32 one-bit pixels. So * getbits() and putbits() retain much the same calling sequence, but * they move bytes around instead of bits. Of course, this entails the * removal of all of the one-bit-pixel dependencies from the other * files, but the major bit-hacking stuff should be covered here. * * I've created some new macros that make it easier to understand what's * going on in the pixel calculations, and that make it easier to change the * pixel size. * * name mfb cfb explanation * ---- --- --- ----------- * PPW 32 4 pixels per word * PLST 31 3 last pixel in a word (should be PPW-1) * PIM 0x1f 0x03 pixel index mask (index within a word) * PWSH 5 2 pixel-to-word shift * PSZ 1 8 pixel size (bits) * PMSK 0x01 0xFF single-pixel mask * * Note that even with these new macros, there are still many dependencies * in the code on the fact that there are 32 bits (not necessarily pixels) * in each word. These macros remove the dependency that 1 pixel == 1 bit. * * I have also added a new macro, PFILL, that takes one pixel and * replicates it throughout a word. This macro definition is dependent * upon pixel and word size; it doesn't use macros like PPW and so * forth. Examples: for monochrome, PFILL(1) => 0xffffffff, PFILL(0) => * 0x00000000. For 8-bit color, PFILL(0x5d) => 0x5d5d5d5d. This macro * is used primarily for replicating a plane mask into a word. * * Color framebuffers operations also support the notion of a plane * mask. This mask determines which planes of the framebuffer can be * altered; the others are left unchanged. I have added another * parameter to the putbits and putbitsrop macros that is the plane * mask. * ========================================================================== */ #define PPW 4 #define PLST 3 #define PIM 0x03 #define PWSH 2 #define PSZ 8 #define PMSK 0xFF /* the following notes use the following conventions: SCREEN LEFT SCREEN RIGHT in this file and maskbits.c, left and right refer to screen coordinates, NOT bit numbering in registers. cfbstarttab[n] pixels[0,n-1] = 0's pixels[n,PPW-1] = 1's cfbendtab[n] = pixels[0,n-1] = 1's pixels[n,PPW-1] = 0's cfbstartpartial[], cfbendpartial[] these are used as accelerators for doing putbits and masking out bits that are all contained between longword boudaries. the extra 256 bytes of data seems a small price to pay -- code is smaller, and narrow things (e.g. window borders) go faster. the names may seem misleading; they are derived not from which end of the word the bits are turned on, but at which end of a scanline the table tends to be used. look at the tables and macros to understand boundary conditions. (careful readers will note that starttab[n] = ~endtab[n] for n != 0) ----------------------------------------------------------------------- these two macros depend on the screen's bit ordering. in both of them x is a screen position. they are used to combine bits collected from multiple longwords into a single destination longword, and to unpack a single source longword into multiple destinations. SCRLEFT(dst, x) takes dst[x, PPW] and moves them to dst[0, PPW-x] the contents of the rest of dst are 0 ONLY IF dst is UNSIGNED. is cast as an unsigned. this is a right shift on the VAX, left shift on Sun and pc-rt. SCRRIGHT(dst, x) takes dst[0,x] and moves them to dst[PPW-x, PPW] the contents of the rest of dst are 0 ONLY IF dst is UNSIGNED. this is a left shift on the VAX, right shift on Sun and pc-rt. the remaining macros are cpu-independent; all bit order dependencies are built into the tables and the two macros above. maskbits(x, w, startmask, endmask, nlw) for a span of width w starting at position x, returns a mask for ragged pixels at start, mask for ragged pixels at end, and the number of whole longwords between the ends. maskpartialbits(x, w, mask) works like maskbits(), except all the pixels are in the same longword (i.e. (x&0xPIM + w) <= PPW) mask32bits(x, w, startmask, endmask, nlw) as maskbits, but does not calculate nlw. it is used by cfbGlyphBlt to put down glyphs <= PPW bits wide. getbits(psrc, x, w, dst) starting at position x in psrc (x < PPW), collect w pixels and put them in the screen left portion of dst. psrc is a longword pointer. this may span longword boundaries. it special-cases fetching all w bits from one longword. +--------+--------+ +--------+ | | m |n| | ==> | m |n| | +--------+--------+ +--------+ x x+w 0 w psrc psrc+1 dst m = PPW - x n = w - m implementation: get m pixels, move to screen-left of dst, zeroing rest of dst; get n pixels from next word, move screen-right by m, zeroing lower m pixels of word. OR the two things together. putbits(src, x, w, pdst, planemask) starting at position x in pdst, put down the screen-leftmost w bits of src. pdst is a longword pointer. this may span longword boundaries. it special-cases putting all w bits into the same longword. +--------+ +--------+--------+ | m |n| | ==> | | m |n| | +--------+ +--------+--------+ 0 w x x+w dst pdst pdst+1 m = PPW - x n = w - m implementation: get m pixels, shift screen-right by x, zero screen-leftmost x pixels; zero rightmost m bits of *pdst and OR in stuff from before the semicolon. shift src screen-left by m, zero bits n-32; zero leftmost n pixels of *(pdst+1) and OR in the stuff from before the semicolon. putbitsrop(src, x, w, pdst, planemask, ROP) like putbits but calls DoRop with the rasterop ROP (see cfb.h for DoRop) getleftbits(psrc, w, dst) get the leftmost w (w<=PPW) bits from *psrc and put them in dst. this is used by the cfbGlyphBlt code for glyphs <=PPW bits wide. */ #include <X.h> #include <Xmd.h> #include <servermd.h> #if (BITMAP_BIT_ORDER == MSBFirst) #define SCRLEFT(lw, n) ((lw) << ((n)*PSZ)) #define SCRRIGHT(lw, n) ((lw) >> ((n)*PSZ)) #else /* (BITMAP_BIT_ORDER == LSBFirst) */ #define SCRLEFT(lw, n) ((lw) >> ((n)*PSZ)) #define SCRRIGHT(lw, n) ((lw) << ((n)*PSZ)) #endif (BITMAP_BIT_ORDER == MSBFirst) /* * Note that the shift direction is independent of the byte ordering of the * machine. The following is portable code. */ #define PFILL(p) ( ((p)&PMSK) | \ ((p)&PMSK) << PSZ | \ ((p)&PMSK) << 2*PSZ | \ ((p)&PMSK) << 3*PSZ ) #define maskbits(x, w, startmask, endmask, nlw) \ startmask = cfbstarttab[(x)&PIM]; \ endmask = cfbendtab[((x)+(w)) & PIM]; \ if (startmask) \ nlw = (((w) - (PPW - ((x)&PIM))) >> PWSH); \ else \ nlw = (w) >> PWSH; #define maskpartialbits(x, w, mask) \ mask = cfbstartpartial[(x) & PIM] & cfbendpartial[((x) + (w)) & PIM]; #define mask32bits(x, w, startmask, endmask) \ startmask = cfbstarttab[(x)&PIM]; \ endmask = cfbendtab[((x)+(w)) & PIM]; #define getbits(psrc, x, w, dst) \ if ( ((x) + (w)) <= PPW) \ { \ dst = SCRLEFT(*(psrc), (x)); \ } \ else \ { \ int m; \ m = PPW-(x); \ dst = (SCRLEFT(*(psrc), (x)) & cfbendtab[m]) | \ (SCRRIGHT(*((psrc)+1), m) & cfbstarttab[m]); \ } #define putbits(src, x, w, pdst, planemask) \ if ( ((x)+(w)) <= PPW) \ { \ unsigned long tmpmask; \ maskpartialbits((x), (w), tmpmask); \ tmpmask &= PFILL(planemask); \ *(pdst) = (*(pdst) & ~tmpmask) | (SCRRIGHT(src, x) & tmpmask); \ } \ else \ { \ unsigned long m; \ unsigned long n; \ unsigned long pm = PFILL(planemask); \ m = PPW-(x); \ n = (w) - m; \ *(pdst) = (*(pdst) & (cfbendtab[x] | ~pm)) | \ (SCRRIGHT(src, x) & (cfbstarttab[x] & pm)); \ *((pdst)+1) = (*((pdst)+1) & (cfbstarttab[n] | ~pm)) | \ (SCRLEFT(src, m) & (cfbendtab[n] & pm)); \ } #define putbitsrop(src, x, w, pdst, planemask, rop) \ if ( ((x)+(w)) <= PPW) \ { \ unsigned long tmpmask; \ unsigned long t1, t2; \ maskpartialbits((x), (w), tmpmask); \ tmpmask &= PFILL(planemask); \ t1 = SCRRIGHT((src), (x)); \ t2 = DoRop(rop, t1, *(pdst)); \ *(pdst) = (*(pdst) & ~tmpmask) | (t2 & tmpmask); \ } \ else \ { \ unsigned long m; \ unsigned long n; \ unsigned long t1, t2; \ unsigned long pm = PFILL(planemask); \ m = PPW-(x); \ n = (w) - m; \ t1 = SCRRIGHT((src), (x)); \ t2 = DoRop(rop, t1, *(pdst)); \ *(pdst) = (*(pdst) & (cfbendtab[x] | ~pm)) | (t2 & (cfbstarttab[x] & pm));\ t1 = SCRLEFT((src), m); \ t2 = DoRop(rop, t1, *((pdst) + 1)); \ *((pdst)+1) = (*((pdst)+1) & (cfbstarttab[n] | ~pm)) | \ (t2 & (cfbendtab[n] & pm)); \ } #define getleftbits(psrc, w, dst) \ dst = *(psrc);

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