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rockbox/firmware/font.c
Bertrik Sikken cb972abc48 Another round of making local functions static 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31384 a1c6a512-1295-4272-9138-f99709370657
2011-12-20 20:35:28 +00:00

990 lines
26 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2002 by Greg Haerr <greg@censoft.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/*
* Rockbox startup font initialization
* This file specifies which fonts get compiled-in and
* loaded at startup, as well as their mapping into
* the FONT_SYSFIXED, FONT_UI and FONT_MP3 ids.
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "inttypes.h"
#include "lcd.h"
#include "system.h"
#include "font.h"
#include "file.h"
#include "core_alloc.h"
#include "debug.h"
#include "panic.h"
#include "rbunicode.h"
#include "diacritic.h"
#include "rbpaths.h"
#define MAX_FONTSIZE_FOR_16_BIT_OFFSETS 0xFFDB
/* max static loadable font buffer size */
#ifndef MAX_FONT_SIZE
#if LCD_HEIGHT > 64
#if MEMORYSIZE > 2
#define MAX_FONT_SIZE 60000
#else
#define MAX_FONT_SIZE 10000
#endif
#else
#define MAX_FONT_SIZE 4000
#endif
#endif
#define GLYPHS_TO_CACHE 256
#if MEMORYSIZE < 4
#define FONT_HARD_LIMIT
#endif
#ifndef FONT_HEADER_SIZE
#define FONT_HEADER_SIZE 36
#endif
#ifndef BOOTLOADER
/* Font cache includes */
#include "font_cache.h"
#include "lru.h"
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* Define this to try loading /.rockbox/.glyphcache *
* when a font specific file fails. This requires the *
* user to copy and rename a font glyph cache file */
//#define TRY_DEFAULT_GLYPHCACHE
/* compiled-in font */
extern struct font sysfont;
#ifndef BOOTLOADER
struct buflib_alloc_data {
struct font font;
int handle_locks; /* is the buflib handle currently locked? */
int refcount; /* how many times has this font been loaded? */
unsigned char buffer[];
};
static int buflib_allocations[MAXFONTS];
static int cache_fd;
static struct font* cache_pf;
static void glyph_cache_save(int font_id);
static int buflibmove_callback(int handle, void* current, void* new)
{
(void)handle;
struct buflib_alloc_data *alloc = (struct buflib_alloc_data*)current;
ptrdiff_t diff = new - current;
if (alloc->handle_locks > 0)
return BUFLIB_CB_CANNOT_MOVE;
#define UPDATE(x) if (x) { x = PTR_ADD(x, diff); }
UPDATE(alloc->font.bits);
UPDATE(alloc->font.offset);
UPDATE(alloc->font.width);
UPDATE(alloc->font.buffer_start);
UPDATE(alloc->font.buffer_end);
UPDATE(alloc->font.buffer_position);
UPDATE(alloc->font.cache._index);
UPDATE(alloc->font.cache._lru._base);
return BUFLIB_CB_OK;
}
static void lock_font_handle(int handle, bool lock)
{
if ( handle < 0 )
return;
struct buflib_alloc_data *alloc = core_get_data(handle);
if ( lock )
alloc->handle_locks++;
else
alloc->handle_locks--;
}
void font_lock(int font_id, bool lock)
{
if( font_id < 0 || font_id >= MAXFONTS )
return;
if( buflib_allocations[font_id] >= 0 )
lock_font_handle(buflib_allocations[font_id], lock);
}
static struct buflib_callbacks buflibops = {buflibmove_callback, NULL };
static inline struct font *pf_from_handle(int handle)
{
struct buflib_alloc_data *alloc = core_get_data(handle);
struct font *pf = &alloc->font;
return pf;
}
static inline unsigned char *buffer_from_handle(int handle)
{
struct buflib_alloc_data *alloc = core_get_data(handle);
unsigned char* buffer = alloc->buffer;
return buffer;
}
/* Font cache structures */
static void cache_create(struct font* pf);
static void glyph_cache_load(const char *font_path, struct font *pf);
/* End Font cache structures */
void font_init(void)
{
int i = 0;
cache_fd = -1;
while (i<MAXFONTS)
buflib_allocations[i++] = -1;
}
/* Check if we have x bytes left in the file buffer */
#define HAVEBYTES(x) (pf->buffer_position + (x) <= pf->buffer_end)
/* Helper functions to read big-endian unaligned short or long from
the file buffer. Bounds-checking must be done in the calling
function.
*/
static short readshort(struct font *pf)
{
unsigned short s;
s = *pf->buffer_position++ & 0xff;
s |= (*pf->buffer_position++ << 8);
return s;
}
static int32_t readlong(struct font *pf)
{
uint32_t l;
l = *pf->buffer_position++ & 0xff;
l |= *pf->buffer_position++ << 8;
l |= ((uint32_t)(*pf->buffer_position++)) << 16;
l |= ((uint32_t)(*pf->buffer_position++)) << 24;
return l;
}
static int glyph_bytes( struct font *pf, int width )
{
int ret;
if (pf->depth)
ret = ( pf->height * width + 1 ) / 2;
else
ret = width * ((pf->height + 7) / 8);
return (ret + 1) & ~1;
}
/* Load memory font */
static struct font* font_load_in_memory(struct font* pf,
int32_t nwidth,
int32_t noffset )
{
int i;
/* variable font data*/
pf->buffer_position = pf->buffer_start + 36;
pf->bits = (unsigned char *)pf->buffer_position;
pf->buffer_position += pf->bits_size*sizeof(unsigned char);
if (pf->bits_size < MAX_FONTSIZE_FOR_16_BIT_OFFSETS)
{
/* pad to 16-bit boundary */
pf->buffer_position = (unsigned char *)(((intptr_t)pf->buffer_position + 1) & ~1);
}
else
{
/* pad to 32-bit boundary*/
pf->buffer_position = (unsigned char *)(((intptr_t)pf->buffer_position + 3) & ~3);
}
if (noffset)
{
if (pf->bits_size < MAX_FONTSIZE_FOR_16_BIT_OFFSETS)
{
pf->long_offset = 0;
pf->offset = (uint16_t*)pf->buffer_position;
/* Check we have sufficient buffer */
if (!HAVEBYTES(noffset * sizeof(uint16_t)))
return NULL;
for (i=0; i<noffset; ++i)
{
((uint16_t*)(pf->offset))[i] = (uint16_t)readshort(pf);
}
}
else
{
pf->long_offset = 1;
pf->offset = (uint16_t*)pf->buffer_position;
/* Check we have sufficient buffer */
if (!HAVEBYTES(noffset * sizeof(int32_t)))
return NULL;
for (i=0; i<noffset; ++i)
{
((uint32_t*)(pf->offset))[i] = (uint32_t)readlong(pf);
}
}
}
else
pf->offset = NULL;
if (nwidth) {
pf->width = (unsigned char *)pf->buffer_position;
pf->buffer_position += nwidth*sizeof(unsigned char);
}
else
pf->width = NULL;
if (pf->buffer_position > pf->buffer_end)
return NULL;
return pf; /* success!*/
}
/* Load cached font */
static struct font* font_load_cached(struct font* pf,
int32_t nwidth,
int32_t noffset)
{
/* We are now at the bitmap data, this is fixed at 36.. */
pf->bits = NULL;
/* Calculate offset to offset data */
pf->buffer_position += pf->bits_size * sizeof(unsigned char);
if (pf->bits_size < MAX_FONTSIZE_FOR_16_BIT_OFFSETS)
{
pf->long_offset = 0;
/* pad to 16-bit boundary */
pf->buffer_position = (unsigned char *)(((intptr_t)pf->buffer_position + 1) & ~1);
}
else
{
pf->long_offset = 1;
/* pad to 32-bit boundary*/
pf->buffer_position = (unsigned char *)(((intptr_t)pf->buffer_position + 3) & ~3);
}
if (noffset)
pf->file_offset_offset = (uint32_t)(pf->buffer_position - pf->buffer_start);
else
pf->file_offset_offset = 0;
/* Calculate offset to widths data */
if (pf->bits_size < MAX_FONTSIZE_FOR_16_BIT_OFFSETS)
pf->buffer_position += noffset * sizeof(uint16_t);
else
pf->buffer_position += noffset * sizeof(uint32_t);
if (nwidth)
pf->file_width_offset = (uint32_t)(pf->buffer_position - pf->buffer_start);
else
pf->file_width_offset = 0;
/* Create the cache */
cache_create(pf);
return pf;
}
static int find_font_index(const char* path)
{
int index = 0, handle;
while (index < MAXFONTS)
{
handle = buflib_allocations[index];
if (handle > 0 && !strcmp(core_get_name(handle), path))
return index;
index++;
}
return FONT_SYSFIXED;
}
const char* font_filename(int font_id)
{
if ( font_id < 0 || font_id >= MAXFONTS )
return NULL;
int handle = buflib_allocations[font_id];
if (handle > 0)
return core_get_name(handle);
return NULL;
}
static size_t font_glyphs_to_bufsize(struct font *pf, int glyphs)
{
size_t bufsize;
/* LRU bytes per glyph */
bufsize = LRU_SLOT_OVERHEAD + sizeof(struct font_cache_entry) +
sizeof( unsigned short);
/* Image bytes per glyph */
bufsize += glyph_bytes(pf, pf->maxwidth);
bufsize *= glyphs;
return bufsize;
}
static struct font* font_load_header(int fd, struct font *pheader,
struct font *pf,
uint32_t *nwidth, uint32_t *noffset)
{
/* Load the header. Readshort() and readlong() *
* update buffer_position address as they read */
pheader->buffer_start = pheader->buffer_position = (char *)pheader;
pheader->buffer_size = FONT_HEADER_SIZE;
pheader->buffer_end = pheader->buffer_start + pheader->buffer_size;
if (read(fd, pheader, FONT_HEADER_SIZE) != FONT_HEADER_SIZE)
return NULL;
/* read magic and version #*/
if (memcmp(pheader->buffer_position, VERSION, 4) != 0)
return NULL;
pheader->buffer_position += 4;
/* font info*/
pf->maxwidth = readshort(pheader);
pf->height = readshort(pheader);
pf->ascent = readshort(pheader);
pf->depth = readshort(pheader);
pf->firstchar = readlong(pheader);
pf->defaultchar = readlong(pheader);
pf->size = readlong(pheader);
/* get variable font data sizes*/
/* # words of bitmap_t*/
pf->bits_size = readlong(pheader);
*noffset = readlong(pheader);
*nwidth = readlong(pheader);
return pf;
}
/* load a font with room for glyphs, limited to bufsize if not zero */
int font_load_ex( const char *path, size_t buf_size, int glyphs )
{
//printf("\nfont_load_ex(%s, %d, %d)\n", path, buf_size, glyphs);
int fd = open(path, O_RDONLY|O_BINARY);
if ( fd < 0 )
return -1;
/* load font struct f with file header */
int file_size = filesize( fd );
struct font header;
struct font *pheader = &header;
struct font f;
uint32_t nwidth, noffset;
if ( !font_load_header( fd, pheader, &f, &nwidth, &noffset )
#if LCD_DEPTH < 16
|| f.depth
#endif
)
{
close(fd);
return -1;
}
/* examine f and calc buffer size */
bool cached = false;
size_t bufsize = buf_size;
size_t glyph_buf_size = font_glyphs_to_bufsize( &f, glyphs );
if ( bufsize && glyphs && bufsize > glyph_buf_size)
bufsize = glyph_buf_size;
else
{
if ( glyphs )
bufsize = glyph_buf_size;
else
bufsize = MAX_FONT_SIZE;
}
#ifdef FONT_HARD_LIMIT
if ( bufsize > MAX_FONT_SIZE )
bufsize = MAX_FONT_SIZE;
#endif
if ( bufsize < (size_t) file_size )
cached = true;
else
bufsize = file_size;
/* check already loaded */
int font_id = find_font_index(path);
if (font_id > FONT_SYSFIXED)
{
/* already loaded, no need to reload */
struct buflib_alloc_data *pd = core_get_data(buflib_allocations[font_id]);
if (pd->font.buffer_size < bufsize)
{
int old_refcount, old_id;
size_t old_bufsize = pd->font.buffer_size;
bool failed = false;
/* reload the font:
* 1) save of refcont and id
* 2) force unload (set refcount to 1 to make sure it get unloaded)
* 3) reload with the larger buffer
* 4) restore the id and refcount
*/
old_id = font_id;
old_refcount = pd->refcount;
pd->refcount = 1;
font_unload(font_id);
font_id = font_load_ex(path, bufsize, glyphs);
if (font_id < 0)
{
failed = true;
font_id = font_load_ex(path, old_bufsize, 0);
/* we couldn't even get the old size, this shouldn't happen */
if ( font_id < 0 )
return -1;
}
if (old_id != font_id)
{
buflib_allocations[old_id] = buflib_allocations[font_id];
buflib_allocations[font_id] = -1;
font_id = old_id;
}
pd = core_get_data(buflib_allocations[font_id]);
pd->refcount = old_refcount;
if(failed)
/* return error because we didn't satisfy the new buffer size */
return -1;
}
pd->refcount++;
//printf("reusing handle %d for %s (count: %d)\n", font_id, path, pd->refcount);
close(fd);
return font_id;
}
int open_slot = -1;
for (font_id = FONT_FIRSTUSERFONT; font_id < MAXFONTS; font_id++)
{
if (buflib_allocations[ font_id ] < 0)
{
open_slot = font_id;
break;
}
}
if ( open_slot == -1 )
return -1;
font_id = open_slot;
/* allocate mem */
int handle = core_alloc_ex( path,
bufsize + sizeof( struct buflib_alloc_data ),
&buflibops );
if ( handle < 0 )
{
return -1;
}
struct buflib_alloc_data *pdata;
pdata = core_get_data(handle);
pdata->handle_locks = 1;
pdata->refcount = 1;
/* load and init */
struct font *pf = pf_from_handle( handle );
memcpy(pf, &f, sizeof( struct font) );
pf->fd = fd;
pf->fd_width = pf->fd_offset = -1;
pf->handle = handle;
pf->buffer_start = buffer_from_handle( pf->handle );
pf->buffer_position = pf->buffer_start + FONT_HEADER_SIZE;
pf->buffer_size = bufsize;
pf->buffer_end = pf->buffer_start + bufsize;
if ( cached )
{
if ( ! font_load_cached( pf, nwidth, noffset ) )
{
core_free( handle );
return -1;
}
/* trick to get a small cache for each file section *
* during glyph_cache_load() */
pf->fd_width = open( path, O_RDONLY|O_BINARY );
pf->fd_offset = open( path, O_RDONLY|O_BINARY );
glyph_cache_load( path, pf );
/* cached font: pf->fd stays open until the font is unloaded */
close( pf->fd_width );
pf->fd_width = -1;
close( pf->fd_offset );
pf->fd_offset = -1;
}
else
{
lseek( fd, 0, SEEK_SET);
read(fd, pf->buffer_start, pf->buffer_size);
close( fd );
pf->fd = -1;
if ( ! font_load_in_memory( pf, nwidth, noffset ) )
{
core_free( handle );
return -1;
}
}
buflib_allocations[font_id] = handle;
//printf("%s -> [%d] -> %d\n", path, font_id, *handle);
lock_font_handle( handle, false );
return font_id; /* success!*/
}
int font_load(const char *path)
{
return font_load_ex(path, MAX_FONT_SIZE, GLYPHS_TO_CACHE);
}
void font_unload(int font_id)
{
if ( font_id < 0 || font_id >= MAXFONTS )
return;
int handle = buflib_allocations[font_id];
if ( handle < 0 )
return;
struct buflib_alloc_data *pdata = core_get_data(handle);
struct font* pf = &pdata->font;
pdata->refcount--;
if (pdata->refcount < 1)
{
//printf("freeing id: %d %s\n", font_id, core_get_name(*handle));
if (pf && pf->fd >= 0)
{
glyph_cache_save(font_id);
close(pf->fd);
}
if (handle > 0)
core_free(handle);
buflib_allocations[font_id] = -1;
}
}
void font_unload_all(void)
{
int i;
for (i=0; i<MAXFONTS; i++)
{
if (buflib_allocations[i] > 0)
{
struct buflib_alloc_data *alloc = core_get_data(buflib_allocations[i]);
alloc->refcount = 1; /* force unload */
font_unload(i);
}
}
}
/*
* Return a pointer to an incore font structure.
* If the requested font isn't loaded/compiled-in,
* decrement the font number and try again.
*/
struct font* font_get(int font)
{
struct font* pf;
if (font == FONT_UI)
font = MAXFONTS-1;
if (font <= FONT_SYSFIXED)
return &sysfont;
while (1) {
if (buflib_allocations[font] > 0)
{
struct buflib_alloc_data *alloc = core_get_data(buflib_allocations[font]);
pf = &alloc->font;
if (pf && pf->height)
return pf;
}
if (--font < 0)
return &sysfont;
}
}
/*
* Reads an entry into cache entry
*/
static void
load_cache_entry(struct font_cache_entry* p, void* callback_data)
{
struct font* pf = callback_data;
unsigned short char_code = p->_char_code;
unsigned char tmp[2];
int fd;
lock_font_handle(pf->handle, true);
if (pf->file_width_offset)
{
int width_offset = pf->file_width_offset + char_code;
/* load via different fd to get this file section cached */
if(pf->fd_width >=0 )
fd = pf->fd_width;
else
fd = pf->fd;
lseek(fd, width_offset, SEEK_SET);
read(fd, &(p->width), 1);
}
else
{
p->width = pf->maxwidth;
}
int32_t bitmap_offset = 0;
if (pf->file_offset_offset)
{
int32_t offset = pf->file_offset_offset + char_code * (pf->long_offset ? sizeof(int32_t) : sizeof(int16_t));
/* load via different fd to get this file section cached */
if(pf->fd_offset >=0 )
fd = pf->fd_offset;
else
fd = pf->fd;
lseek(fd, offset, SEEK_SET);
read (fd, tmp, 2);
bitmap_offset = tmp[0] | (tmp[1] << 8);
if (pf->long_offset) {
read (fd, tmp, 2);
bitmap_offset |= (tmp[0] << 16) | (tmp[1] << 24);
}
}
else
{
bitmap_offset = char_code * glyph_bytes(pf, p->width);
}
int32_t file_offset = FONT_HEADER_SIZE + bitmap_offset;
lseek(pf->fd, file_offset, SEEK_SET);
int src_bytes = glyph_bytes(pf, p->width);
read(pf->fd, p->bitmap, src_bytes);
lock_font_handle(pf->handle, false);
}
/*
* Converts cbuf into a font cache
*/
static void cache_create(struct font* pf)
{
/* maximum size of rotated bitmap */
int bitmap_size = glyph_bytes( pf, pf->maxwidth);
/* Initialise cache */
font_cache_create(&pf->cache, pf->buffer_start, pf->buffer_size, bitmap_size);
}
/*
* Returns width of character
*/
int font_get_width(struct font* pf, unsigned short char_code)
{
/* check input range*/
if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
char_code = pf->defaultchar;
char_code -= pf->firstchar;
return (pf->fd >= 0 && pf != &sysfont)?
font_cache_get(&pf->cache,char_code,load_cache_entry,pf)->width:
pf->width? pf->width[char_code]: pf->maxwidth;
}
const unsigned char* font_get_bits(struct font* pf, unsigned short char_code)
{
const unsigned char* bits;
/* check input range*/
if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
char_code = pf->defaultchar;
char_code -= pf->firstchar;
if (pf->fd >= 0 && pf != &sysfont)
{
bits =
(unsigned char*)font_cache_get(&pf->cache,char_code,load_cache_entry, pf)->bitmap;
}
else
{
bits = pf->bits;
if (pf->offset)
{
if (pf->bits_size < MAX_FONTSIZE_FOR_16_BIT_OFFSETS)
bits += ((uint16_t*)(pf->offset))[char_code];
else
bits += ((uint32_t*)(pf->offset))[char_code];
}
else
bits += char_code * glyph_bytes(pf, pf->maxwidth);
}
return bits;
}
static void font_path_to_glyph_path( const char *font_path, char *glyph_path)
{
/* take full file name, cut extension, and add .glyphcache */
strlcpy(glyph_path, font_path, MAX_PATH);
glyph_path[strlen(glyph_path)-4] = '\0';
strcat(glyph_path, ".gc");
}
/* call with NULL to flush */
static void glyph_file_write(void* data)
{
struct font_cache_entry* p = data;
struct font* pf = cache_pf;
unsigned short ch;
static int buffer_pos = 0;
#define WRITE_BUFFER 256
static unsigned char buffer[WRITE_BUFFER];
/* flush buffer & reset */
if ( data == NULL || buffer_pos >= WRITE_BUFFER)
{
write(cache_fd, buffer, buffer_pos);
buffer_pos = 0;
if ( data == NULL )
return;
}
if ( p->_char_code == 0xffff )
return;
ch = p->_char_code + pf->firstchar;
buffer[buffer_pos] = ch >> 8;
buffer[buffer_pos+1] = ch & 0xff;
buffer_pos += 2;
return;
}
/* save the char codes of the loaded glyphs to a file */
static void glyph_cache_save(int font_id)
{
int fd;
if( font_id < 0 )
return;
int handle = buflib_allocations[font_id];
if ( handle < 0 )
return;
struct font *pf = pf_from_handle(handle);
if(pf && pf->fd >= 0)
{
char filename[MAX_PATH];
font_path_to_glyph_path(font_filename(font_id), filename);
fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (fd < 0)
return;
cache_pf = pf;
cache_fd = fd;
lru_traverse(&cache_pf->cache._lru, glyph_file_write);
glyph_file_write(NULL);
if (cache_fd >= 0)
{
close(cache_fd);
cache_fd = -1;
}
}
return;
}
static int ushortcmp(const void *a, const void *b)
{
return ((int)(*(unsigned short*)a - *(unsigned short*)b));
}
static void glyph_cache_load(const char *font_path, struct font *pf)
{
#define MAX_SORT 256
if (pf->fd >= 0) {
int i, size, fd;
unsigned char tmp[2];
unsigned short ch;
unsigned short glyphs[MAX_SORT];
unsigned short glyphs_lru_order[MAX_SORT];
int glyph_file_skip=0, glyph_file_size=0;
int sort_size = pf->cache._capacity;
if ( sort_size > MAX_SORT )
sort_size = MAX_SORT;
char filename[MAX_PATH];
font_path_to_glyph_path(font_path, filename);
fd = open(filename, O_RDONLY|O_BINARY);
#ifdef TRY_DEFAULT_GLYPHCACHE
/* if font specific file fails, try default */
if (fd < 0)
fd = open(GLYPH_CACHE_FILE, O_RDONLY|O_BINARY);
#endif
if (fd >= 0) {
/* only read what fits */
glyph_file_size = filesize( fd );
if ( glyph_file_size > 2*pf->cache._capacity ) {
glyph_file_skip = glyph_file_size - 2*pf->cache._capacity;
lseek( fd, glyph_file_skip, SEEK_SET );
}
while(1) {
for ( size = 0;
read( fd, tmp, 2 ) == 2 && size < sort_size;
size++ )
{
glyphs[size] = (tmp[0] << 8) | tmp[1];
glyphs_lru_order[size] = glyphs[size];
}
/* sort glyphs array to make sector cache happy */
qsort((void *)glyphs, size, sizeof(unsigned short),
ushortcmp );
/* load font bitmaps */
for( i = 0; i < size ; i++ )
font_get_bits(pf, glyphs[i]);
/* redo to fix lru order */
for ( i = 0; i < size ; i++)
font_get_bits(pf, glyphs_lru_order[i]);
if ( size < sort_size )
break;
}
close(fd);
} else {
/* load latin1 chars into cache */
for ( ch = 32 ; ch < 256 && ch < pf->cache._capacity + 32; ch++ )
font_get_bits(pf, ch);
}
}
return;
}
#else /* BOOTLOADER */
void font_init(void)
{
}
void font_lock(int font_id, bool lock)
{
(void)font_id;
(void)lock;
}
/*
* Bootloader only supports the built-in sysfont.
*/
struct font* font_get(int font)
{
(void)font;
return &sysfont;
}
/*
* Returns width of character
*/
int font_get_width(struct font* pf, unsigned short char_code)
{
/* check input range*/
if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
char_code = pf->defaultchar;
char_code -= pf->firstchar;
return pf->width? pf->width[char_code]: pf->maxwidth;
}
const unsigned char* font_get_bits(struct font* pf, unsigned short char_code)
{
const unsigned char* bits;
/* check input range*/
if (char_code < pf->firstchar || char_code >= pf->firstchar+pf->size)
char_code = pf->defaultchar;
char_code -= pf->firstchar;
/* assume small font with uint16_t offsets*/
bits = pf->bits + (pf->offset?
((uint16_t*)(pf->offset))[char_code]:
(((pf->height + 7) / 8) * pf->maxwidth * char_code));
return bits;
}
#endif /* BOOTLOADER */
/*
* Returns the stringsize of a given string.
*/
int font_getstringsize(const unsigned char *str, int *w, int *h, int fontnumber)
{
struct font* pf = font_get(fontnumber);
unsigned short ch;
int width = 0;
font_lock( fontnumber, true );
for (str = utf8decode(str, &ch); ch != 0 ; str = utf8decode(str, &ch))
{
if (is_diacritic(ch, NULL))
continue;
/* get proportional width and glyph bits*/
width += font_get_width(pf,ch);
}
if ( w )
*w = width;
if ( h )
*h = pf->height;
font_lock( fontnumber, false );
return width;
}
/* -----------------------------------------------------------------
* vim: et sw=4 ts=8 sts=4 tw=78
*/
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