generic support for caching glyphs in video memory
for speeding up anti-aliased fonts on slow CPUs
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macallan
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e297db4b59
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# $NetBSD: files.wscons,v 1.45 2011/06/29 03:09:37 macallan Exp $
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# $NetBSD: files.wscons,v 1.46 2012/02/16 17:29:21 macallan Exp $
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#
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# "Workstation Console" glue; attaches frame buffer to emulator & keyboard,
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@ -77,3 +77,7 @@ defflag opt_tpcalib.h TPCALIBDEBUG
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file dev/wscons/wsdisplay_vcons.c vcons
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file dev/wscons/wsdisplay_vcons_util.c vcons
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defflag opt_vcons.h VCONS_DRAW_INTR VCONS_INTR_DEBUG
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# generic support code for caching rendered glyphs in video memory
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define glyphcache
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file dev/wscons/wsdisplay_glyphcache.c glyphcache
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/* $NetBSD: wsdisplay_glyphcache.c,v 1.1 2012/02/16 17:29:21 macallan Exp $ */
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/*
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* Copyright (c) 2012 Michael Lorenz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* a simple glyph cache in offscreen memory
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* For now it only caches glyphs with the default attribute ( assuming they're
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* the most commonly used glyphs ) but the API should at least not prevent
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* more sophisticated caching algorithms
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*/
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#include <sys/atomic.h>
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#include <sys/errno.h>
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#include <dev/wscons/wsdisplay_glyphcachevar.h>
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/* first line, lines, width, attr */
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int
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glyphcache_init(glyphcache *gc, int first, int lines, int width,
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int cellwidth, int cellheight, long attr)
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{
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int cache_lines;
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gc->gc_cellwidth = cellwidth;
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gc->gc_cellheight = cellheight;
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gc->gc_firstline = first;
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gc->gc_cellsperline = width / cellwidth;
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cache_lines = lines / cellheight;
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gc->gc_numcells = cache_lines * gc->gc_cellsperline;
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if (gc->gc_numcells > 256)
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gc->gc_numcells = 256;
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gc->gc_attr = attr;
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glyphcache_wipe(gc);
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return 0;
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}
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void
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glyphcache_wipe(glyphcache *gc)
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{
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int i;
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gc->gc_usedcells = 0;
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for (i = 0; i < 256; i++)
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gc->gc_map[i] = -1;
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}
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/*
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* add a glyph drawn at (x,y) to the cache as (c)
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* call this only if glyphcache_try() returned GC_ADD
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* caller or gc_bitblt must make sure the glyph is actually completely drawn
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*/
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int
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glyphcache_add(glyphcache *gc, int c, int x, int y)
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{
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int cell;
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int cx, cy;
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if (gc->gc_map[c] != -1)
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return EINVAL;
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if (gc->gc_usedcells >= gc->gc_numcells)
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return ENOMEM;
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cell = atomic_add_int_nv(&gc->gc_usedcells, 1) - 1;
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gc->gc_map[c] = cell;
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cy = gc->gc_firstline +
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(cell / gc->gc_cellsperline) * gc->gc_cellheight;
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cx = (cell % gc->gc_cellsperline) * gc->gc_cellwidth;
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gc->gc_bitblt(gc->gc_blitcookie, x, y, cx, cy,
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gc->gc_cellwidth, gc->gc_cellheight, gc->gc_rop);
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return 0;
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}
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/*
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* check if (c) is in the cache, if so draw it at (x,y)
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* return:
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* - GC_OK when the glyph was found
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* - GC_ADD when the glyph wasn't found but can be added
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* - GC_NOPE when the glyph can't be cached
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*/
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int
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glyphcache_try(glyphcache *gc, int c, int x, int y, long attr)
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{
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int cell, cx, cy;
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if ((c < 0) || (c > 255) || (attr != gc->gc_attr))
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return GC_NOPE;
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if (gc->gc_usedcells >= gc->gc_numcells)
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return GC_NOPE;
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cell = gc->gc_map[c];
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if (cell == -1)
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return GC_ADD;
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cy = gc->gc_firstline +
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(cell / gc->gc_cellsperline) * gc->gc_cellheight;
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cx = (cell % gc->gc_cellsperline) * gc->gc_cellwidth;
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gc->gc_bitblt(gc->gc_blitcookie, cx, cy, x, y,
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gc->gc_cellwidth, gc->gc_cellheight, gc->gc_rop);
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return GC_OK;
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}
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@ -0,0 +1,65 @@
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/* $NetBSD: wsdisplay_glyphcachevar.h,v 1.1 2012/02/16 17:29:21 macallan Exp $ */
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/*
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* Copyright (c) 2012 Michael Lorenz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* a simple glyph cache in offscreen memory */
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#ifndef WSDISPLAY_GLYPHCACHEVAR_H
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#define WSDISPLAY_GLYPHCACHEVAR_H
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typedef struct _glyphcache {
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/* mapping char codes to cache cells */
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volatile unsigned int gc_usedcells;
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int gc_numcells;
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int gc_map[256];
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/* geometry */
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int gc_cellwidth;
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int gc_cellheight;
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int gc_cellsperline;
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int gc_firstline; /* first line in vram to use for glyphs */
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long gc_attr;
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/*
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* method to copy glyphs within vram,
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* to be initialized before calling glyphcache_init()
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*/
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void (*gc_bitblt)(void *, int, int, int, int, int, int, int);
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void *gc_blitcookie;
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int gc_rop;
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} glyphcache;
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/* first line, lines, width, cellwidth, cellheight, attr */
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int glyphcache_init(glyphcache *, int, int, int, int, int, long);
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/* clear out the cache, for example when returning from X */
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void glyphcache_wipe(glyphcache *);
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/* add a glyph to the cache */
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int glyphcache_add(glyphcache *, int, int, int); /* char code, x, y */
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/* try to draw a glyph from the cache */
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int glyphcache_try(glyphcache *, int, int, int, long); /* char code, x, y, attr */
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#define GC_OK 0 /* glyph was in cache and has been drawn */
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#define GC_ADD 1 /* glyph is not in cache but can be added */
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#define GC_NOPE 2 /* glyph is not in cache and can't be added */
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#endif /* WSDISPLAY_GLYPHCACHEVAR_H */
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