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/*
(c) Copyright 2001-2009 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.
*/
#ifndef __FONTS_H__
#define __FONTS_H__
#include <pthread.h>
#include <fusion/lock.h>
#include <directfb.h>
#include <core/coretypes.h>
#include <core/state.h>
/*
* glyph struct
*/
struct _CoreGlyphData {
DirectLink link;
unsigned int index;
unsigned int layer;
unsigned int row;
CoreSurface *surface; /* contains bitmap of glyph */
int start; /* x offset of glyph in surface */
int width; /* width of the glyphs bitmap */
int height; /* height of the glyphs bitmap */
int left; /* x offset of the glyph */
int top; /* y offset of the glyph */
int xadvance; /* placement of next glyph */
int yadvance;
bool inserted;
bool failed;
int magic;
};
typedef struct {
DFBResult (* GetCharacterIndex) ( CoreFont *thiz,
unsigned int character,
unsigned int *ret_index );
DFBResult (* DecodeText) ( CoreFont *thiz,
const void *text,
int length,
unsigned int *ret_indices,
int *ret_num );
} CoreFontEncodingFuncs;
typedef struct {
DirectLink link;
DFBTextEncodingID encoding;
char *name;
const CoreFontEncodingFuncs *funcs;
int magic;
} CoreFontEncoding;
typedef struct {
unsigned int stamp;
CoreSurface *surface;
int next_x;
DirectLink *glyphs;
int magic;
} CoreFontCacheRow;
#define DFB_FONT_MAX_LAYERS 2
/*
* font struct
*/
struct _CoreFont {
CoreDFB *core;
DFBFontDescription description; /* original description used to create the font */
char *url;
DFBSurfaceBlittingFlags blittingflags;
DFBSurfacePixelFormat pixel_format;
DFBSurfaceCapabilities surface_caps;
int row_width;
int max_rows;
DFBFontAttributes attributes;
CoreFontCacheRow **rows; /* contain bitmaps of loaded glyphs */
int num_rows;
int active_row;
unsigned int row_stamp;
struct {
DirectHash *glyph_hash; /* infos about loaded glyphs */
CoreGlyphData *glyph_data[128];
} layers[DFB_FONT_MAX_LAYERS];
int height; /* font height */
int ascender; /* a positive value, the distance
from the baseline to the top */
int descender; /* a negative value, the distance
from the baseline to the bottom */
int maxadvance; /* width of largest character */
float up_unit_x; /* unit vector pointing 'up' in for */
float up_unit_y; /* this font's rotation */
pthread_mutex_t lock; /* lock during access to the font */
const CoreFontEncodingFuncs *utf8; /* for default encoding, DTEID_UTF8 */
CoreFontEncoding **encodings; /* for other encodings */
DFBTextEncodingID last_encoding; /* dynamic allocation impl. helper */
void *impl_data; /* a pointer used by the impl. */
DFBResult (* GetGlyphData) ( CoreFont *thiz,
unsigned int index,
CoreGlyphData *data );
DFBResult (* RenderGlyph) ( CoreFont *thiz,
unsigned int index,
CoreGlyphData *data );
DFBResult (* GetKerning) ( CoreFont *thiz,
unsigned int prev,
unsigned int current,
int *ret_x,
int *ret_y );
int magic;
};
/*
* allocates and initializes a new font structure
*/
DFBResult dfb_font_create( CoreDFB *core,
const DFBFontDescription *description,
const char *url,
CoreFont **ret_font );
/*
* destroy all data in the CoreFont struct
*/
void dfb_font_destroy( CoreFont *font );
/*
* lock the font before accessing it
*/
static inline void
dfb_font_lock( CoreFont *font )
{
D_MAGIC_ASSERT( font, CoreFont );
pthread_mutex_lock( &font->lock );
}
/*
* unlock the font after access
*/
static inline void
dfb_font_unlock( CoreFont *font )
{
D_MAGIC_ASSERT( font, CoreFont );
pthread_mutex_unlock( &font->lock );
}
/*
* loads glyph data from font
*/
DFBResult dfb_font_get_glyph_data( CoreFont *font,
unsigned int index,
unsigned int layer,
CoreGlyphData **glyph_data );
/*
* Called by font module to register encoding implementations.
*
* The encoding can be DTEID_UTF8 or DTEID_OTHER, where in the
* latter case the actual id will be allocated dynamically.
*
* In the case of DTEID_UTF8 it's allowed to only provide
* GetCharacterIndex() and let the core do the DecodeText(),
* but that would cause a GetCharacterIndex() call per decoded
* unicode character. So implementing both is advisable.
*
* If nothing is registered for DTEID_UTF8 at all, the core will
* pass the raw unicode characters to GetGlyphInfo(), RenderGlyph() etc.
* That's the old behaviour, fully compatible with old modules. It's
* also a good choice if you want to avoid the character translation,
* having an efficient font module which is based natively on unicode
* characters.
*
* For registering an encoding as DTEID_OTHER both GetCharacterIndex()
* and DecodeText() must be provided.
*/
DFBResult dfb_font_register_encoding( CoreFont *font,
const char *name,
const CoreFontEncodingFuncs *funcs,
DFBTextEncodingID encoding );
DFBResult dfb_font_decode_text( CoreFont *font,
DFBTextEncodingID encoding,
const void *text,
int length,
unsigned int *ret_indices,
int *ret_num );
DFBResult dfb_font_decode_character( CoreFont *font,
DFBTextEncodingID encoding,
u32 character,
unsigned int *ret_index );
#endif
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