/*      $NetBSD: raster_text.c,v 1.10 2012/01/31 04:28:03 matt Exp $ */

/*-
* Copyright (c) 1991, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory and to the University
* of California at Berkeley by Jef Poskanzer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)raster_text.c       8.1 (Berkeley) 6/11/93
*/

/*
* Text routines for raster library.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: raster_text.c,v 1.10 2012/01/31 04:28:03 matt Exp $");

#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <dev/rcons/raster.h>
#ifdef COLORFONT_CACHE
#include <sys/malloc.h>
#define NEW(size) malloc(size, M_DEVBUF, M_NOWAIT)
#endif
#else
#include <string.h>
#include "raster.h"
#ifdef COLORFONT_CACHE
#include <malloc.h>
#define NEW(size) malloc(size)
#endif
#endif

/* Draws text.  Returns 0 on success, -1 on failure. */
int
raster_text(
   struct raster* r,
   int x,
   int y,
   int rop,
   struct raster_font* rf,
   unsigned char* text)
   {
   return raster_textn( r, x, y, rop, rf, text, strlen( text ) );
   }

/* Draws n characters of text.  Returns 0 on success, -1 on failure. */
int
raster_textn(
   struct raster* r,
   int x,
   int y,
   int rop,
   struct raster_font* rf,
   unsigned char* text,
   int n)
   {
   int clip;
   int x1, y1;
   struct raster_char* c;
   struct raster* charrast;
   int i;
   unsigned char ch;
   int thisx, thisy;
   int phase;

   /* Check whether we can avoid clipping. */
   clip = 0;
   if ( rf->flags & RASFONT_FIXEDWIDTH &&
        rf->flags & RASFONT_NOVERTICALMOVEMENT )
       {
       /* This font is well-behaved, we can compute the extent cheaply. */
       c = &(rf->chars['@']);
       charrast = c->r;
       if ( x + c->homex < 0 || y + c->homey < 0 ||
            x + c->homex + n * c->nextx > r->width ||
            y + c->homey + charrast->height > r->height )
           clip = 1;
       }
   else
       {
       /* Got to step through the string to compute the extent. */
       for ( i = 0, x1 = x, y1 = y;
             i < n;
             ++i, x1 += c->nextx, y1 += c->nexty )
           {
           c = &(rf->chars[text[i]]);
           charrast = c->r;
           if ( charrast != (struct raster*) 0 )
               {
               if ( x1 + c->homex < 0 || y1 + c->homey < 0 ||
                    x1 + c->homex + charrast->width > r->width ||
                    y1 + c->homey + charrast->height > r->height )
                   {
                   clip = 1;
                   break;
                   }
               }
           }
       }

   /* Now display the text. */
   for ( i = 0, x1 = x, y1 = y;
         i < n;
         ++i, x1 += c->nextx, y1 += c->nexty )
       {
       ch = text[i];
       c = &(rf->chars[ch]);
       charrast = c->r;
       if ( charrast != (struct raster*) 0 )
           {
           thisx = x1 + c->homex;
           thisy = y1 + c->homey;

           phase = 0;
#ifdef COLORFONT_CACHE
           if ( r->depth == 8 )
               {
               /* Initialize color font cache if necessary. */
               if ( rf->cache == (struct raster_fontcache*) -1 )
                   {
                   int c;

                   rf->cache = (struct raster_fontcache*)
                       NEW( sizeof(struct raster_fontcache) );
                   if ( rf->cache != (struct raster_fontcache*) 0 )
                       for ( c = 0; c < 256; ++c )
                           rf->cache->cr[c] = (struct raster*) 0;
                   }

               if ( rf->cache != (struct raster_fontcache*) 0 )
                   {
                   int color;
                   struct raster* cr;

                   color = RAS_GETCOLOR( rop );
                   cr = rf->cache->cr[ch];
                   /* Is this character cached yet? */
                   if ( cr != (struct raster*) 0 )
                       {
                       /* Yes, but is it the right color? */
                       if ( rf->cache->color[ch] == color )
                           {
                           /* Yes - switch rasters. */
                           charrast = cr;
                           }
                       else
                           {
                           /* No, re-draw it. */
                           if ( raster_op_noclip(
                                cr, 0, 0, charrast->width,
                                charrast->height, rop, charrast, 0, 0 ) == 0 )
                               {
                               rf->cache->color[ch] = color;
                               charrast = cr;
                               }
                           }
                       }
                   else
                       {
                       /* It's not cached, so cache it. */
                       cr = raster_alloc(
                           charrast->width, charrast->height, 8 );
                       if ( cr != (struct raster*) 0 )
                           if ( raster_op_noclip(
                                cr, 0, 0, charrast->width, charrast->height,
                                rop, charrast, 0, 0 ) == 0 )
                               {
                               rf->cache->color[ch] = color;
                               charrast = rf->cache->cr[ch] = cr;
                               }
                       }
                   }
               }
#endif /*COLORFONT_CACHE*/

           if ( clip )
               {
               if ( raster_op(
                        r, thisx, thisy, charrast->width, charrast->height,
                        rop, charrast, phase, 0 ) < 0 )
                   return -1;
               }
           else
               {
               if ( raster_op_noclip(
                        r, thisx, thisy, charrast->width, charrast->height,
                        rop, charrast, phase, 0 ) < 0 )
                   return -1;
               }
           }
       }

   return 0;
   }

#ifdef COLORFONT_CACHE
/* Allocates a raster.  Returns (struct raster*) 0 on failure. */
struct raster*
raster_alloc(
   int width,
   int height,
   int depth)
   {
   struct raster* r;
   int linelongs;

   if ( width <= 0 || height <= 0 || ( depth != 1 && depth != 8 ) )
       return (struct raster*) 0;
   linelongs = ( ( width * depth + 31 ) >> 5 );
   r = (struct raster*)
       NEW( sizeof(struct raster) + height * linelongs * sizeof(u_int32_t));
   if ( r == (struct raster*) 0 )
       return (struct raster*) 0;

   r->width = width;
   r->height = height;
   r->depth = depth;
   r->linelongs = linelongs;
   r->pixels = (u_int32_t*) (r + 1);
   r->data = (void *) 0;
   return r;
   }
#endif

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