/*
   (c) Copyright 2001-2008  The world wide DirectFB Open Source Community (directfb.org)
   (c) Copyright 2000-2004  Convergence (integrated media) GmbH

   All rights reserved.

   Written by Denis Oliver Kropp <dok@directfb.org>,
              Andreas Hundt <andi@fischlustig.de>,
              Sven Neumann <neo@directfb.org>,
              Ville Syrjälä <syrjala@sci.fi> and
              Claudio Ciccani <klan@users.sf.net>.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <config.h>
#include <stdarg.h>

#include <directfb.h>

#include <core/fonts.h>
#include <core/gfxcard.h>
#include <core/surface.h>
#include <core/surface_buffer.h>

#include <gfx/convert.h>

#include <media/idirectfbfont.h>

#include <direct/hash.h>

#include <direct/interface.h>
#include <direct/mem.h>
#include <direct/memcpy.h>
#include <direct/utf8.h>

#include "default_font.h"

#define DEFAULT_FONT_HEIGHT     24
#define DEFAULT_FONT_ASCENDER   16
#define DEFAULT_FONT_DESCENDER  -4


static DFBResult
Probe( IDirectFBFont_ProbeContext *ctx );

static DFBResult
Construct( IDirectFBFont      *thiz,
	   ... );

#include <direct/interface_implementation.h>

DIRECT_INTERFACE_IMPLEMENTATION( IDirectFBFont, Default )


static DFBResult
Probe( IDirectFBFont_ProbeContext *ctx )
{
     /* default font is created with a NULL filename */
     if (ctx->filename)
          return DFB_UNSUPPORTED;

     return DFB_OK;
}

static DFBResult
Construct( IDirectFBFont      *thiz,
	   ... )
{
     DFBResult         ret;
     CoreFont         *font;
     CoreSurface      *surface;
     CoreFontCacheRow *row;
     u8               *pixels;
     int               i;

     CoreDFB *core;
     char *filename;
     DFBFontDescription *desc;
     CoreSurfaceConfig  config;

     va_list tag;
     va_start(tag, thiz);
     core = va_arg(tag, CoreDFB *);
     filename = va_arg(tag, char *);
     desc = va_arg(tag, DFBFontDescription *);
     va_end( tag );

     D_DEBUG( "DirectFB/FontDefault: Construct default font");

     ret = dfb_font_create( core, &font );
     if (ret) {
          DIRECT_DEALLOCATE_INTERFACE( thiz );
          return ret;
     }

     D_ASSERT( font->pixel_format == DSPF_ARGB ||
               font->pixel_format == DSPF_AiRGB ||
               font->pixel_format == DSPF_ARGB4444 ||
               font->pixel_format == DSPF_ARGB2554 ||
               font->pixel_format == DSPF_ARGB1555 ||
               font->pixel_format == DSPF_A8 ||
               font->pixel_format == DSPF_A4 ||
               font->pixel_format == DSPF_A1 );

     font->height    = DEFAULT_FONT_HEIGHT;
     font->ascender  = DEFAULT_FONT_ASCENDER;
     font->descender = DEFAULT_FONT_DESCENDER;

     row = D_CALLOC( 1, sizeof(CoreFontCacheRow) );
     if (!row) {
          D_OOM();
          dfb_font_destroy( font );
          DIRECT_DEALLOCATE_INTERFACE( thiz );
          return DFB_NOSYSTEMMEMORY;
     }

     config.flags  = CSCONF_SIZE | CSCONF_FORMAT;
     config.size.w = font_desc.width;
     config.size.h = font_desc.height;
     config.format = font->pixel_format;

     ret = dfb_surface_create( core, &config, CSTF_FONT, 0, NULL, &surface );
     if (ret) {
          dfb_font_destroy( font );
          return ret;
     }

     font->num_rows  = 1;
     font->row_width = font_desc.width;
     font->rows      = D_MALLOC(sizeof (void *));
     font->rows[0]   = row;

     row->surface = surface;

     D_MAGIC_SET( row, CoreFontCacheRow );

     pixels = font_data;

     {
          CoreGlyphData *data;
          int use_unicode;
          int start = 0;
          int index = 0;
          int key;
          const char *glyphs =
          "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
          "abcdefghijklmnopqrstuvwxyz"
          "01234567890!\"$%&/()=?^<>" // FIXME: '0' is repeated!
          "|,;.:-_{[]}\\`+*~#'";

          if (desc && (desc->flags & DFDESC_ATTRIBUTES) &&
              (desc->attributes & DFFA_NOCHARMAP))
               use_unicode = 0;
          else
               use_unicode = 1;

          for (i = 0; i < font_desc.width; i++) {
               if (pixels[i] == 0xFF) {
                    if (use_unicode)
                         key = glyphs[index];
                    else
                         key = index;
                         
                    if (!direct_hash_lookup( font->glyph_hash, key )) { 
                         data = D_CALLOC( 1, sizeof(CoreGlyphData) );
                         data->surface = surface;
                         data->start   = start;
                         data->width   = i - start + 1;
                         data->height  = font_desc.height - 1;
                         data->left    = 0;
                         data->top     = 0;
                         data->advance = ((desc && (desc->flags &
                                                    DFDESC_FIXEDADVANCE)) ?
                                         desc->fixed_advance :
                                         data->width + 1);

                         D_DEBUG( "DirectFB/core/fonts: "
                                       "glyph '%c' at %d, width %d\n",
                                       glyphs[index], start, i-start );

                         D_MAGIC_SET( data, CoreGlyphData );

                         if (font->maxadvance < data->advance)
                              font->maxadvance = data->advance;
                              
                         direct_hash_insert( font->glyph_hash, key, data );
                    }

                    start = i + 1;
                    index++;
               }
               if (glyphs[index] == '\0')
                    break;
          }

          /*  space  */
          data = D_CALLOC( 1, sizeof(CoreGlyphData) );
          data->advance = 5;

          D_MAGIC_SET( data, CoreGlyphData );

          if (use_unicode)
               key = 32;
          else
               key = index;

          direct_hash_insert( font->glyph_hash, key, data );
     }

     {
          CoreSurfaceBufferLock lock;

          ret = dfb_surface_lock_buffer( surface, CSBR_BACK, CSAID_CPU, CSAF_WRITE, &lock );
          if (ret) {
               D_DERROR( ret, "IDirectFBFont_Default: Could not lock surface buffer!\n" );
          }
          else {
               for (i = 1; i < font_desc.height; i++) {
                    int    i, j, n;
                    u8  *dst8  = lock.addr;
                    u16 *dst16 = lock.addr;
                    u32 *dst32 = lock.addr;

                    pixels += font_desc.preallocated[0].pitch;
                    switch (surface->config.format) {
                         case DSPF_ARGB:
                              for (n=0; n<font_desc.width; n++)
                                   dst32[n] = (pixels[n] << 24) | 0xFFFFFF;
                              break;
                         case DSPF_AiRGB:
                              for (n=0; n<font_desc.width; n++)
                                   dst32[n] = ((pixels[n] ^ 0xFF) << 24) | 0xFFFFFF;
                              break;
                         case DSPF_ARGB4444:
                              for (n=0; n<font_desc.width; n++)
                                   dst16[n] = (pixels[n] << 8) | 0xFFF;
                              break;
                         case DSPF_ARGB2554:
                              for (n=0; n<font_desc.width; n++)
                                   dst16[n] = (pixels[n] << 8) | 0x3FFF;
                              break;
                         case DSPF_ARGB1555:
                              for (n=0; n<font_desc.width; n++)
                                   dst16[n] = (pixels[n] << 8) | 0x7FFF;
                              break;
                         case DSPF_A8:
                              direct_memcpy(lock.addr, pixels, font_desc.width);
                              break;
                         case DSPF_A4:
                              for (n=0, j=0; j < font_desc.width; n++, j+=2)
                                   dst8[n] = (pixels[j] & 0xF0) | (pixels[j+1] >> 4);
                              break;
                         case DSPF_A1:
                              for (i=0, j=0; i < font_desc.width; ++j) {
                                   register u8 p = 0;

                                   for (n=0; n<8 && i<font_desc.width; ++i, ++n)
                                        p |= (pixels[i] & 0x80) >> n;

                                   dst8[j] = p;
                              }
                              break;
                         default:
                              break;
                    }

                    lock.addr += lock.pitch;
               }

               dfb_surface_unlock_buffer( surface, &lock );
          }
     }

     return IDirectFBFont_Construct (thiz, font);
}
