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rockbox/firmware/font.c
Thomas Martitz 9edd6d4ee9 Anti-Aliased Fonts support. 
This enables Rockbox to render anti-aliased fonts using an alpha blending method.
The input font bitmaps are 4bit, i.e. 4x larger, but the metadata size stays the same.

A tool, convttf, for converting ttf fonts directly to the Rockbox fnt format is provided.
It has a useful help output, but the parameter that works best is -c1 or -c2 (2 for larger font sizes).

Flyspray: FS#8961
Author: Initial work by Jonas Hurrelmann, further work by Fred Bauer, Andrew Mahone, Teruaki Kawashima and myself.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29523 a1c6a512-1295-4272-9138-f99709370657
2011-03-05 18:36:51 +00:00

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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 "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
#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
/* compiled-in font */
extern struct font sysfont;
#ifndef BOOTLOADER
/* structure filled in by font_load */
static struct font font_ui;
/* static buffer allocation structures */
static unsigned char main_buf[MAX_FONT_SIZE] CACHEALIGN_ATTR;
#ifdef HAVE_REMOTE_LCD
#define REMOTE_FONT_SIZE 10000
static struct font remote_font_ui;
static unsigned char remote_buf[REMOTE_FONT_SIZE] CACHEALIGN_ATTR;
#endif
/* system font table, in order of FONT_xxx definition */
static struct font* sysfonts[MAXFONTS] = { &sysfont, &font_ui, NULL};
/* Font cache structures */
static void cache_create(struct font* pf);
static void glyph_cache_load(struct font* pf);
/* End Font cache structures */
void font_init(void)
{
int i = SYSTEMFONTCOUNT;
while (i<MAXFONTS)
sysfonts[i++] = NULL;
font_reset(NULL);
#ifdef HAVE_REMOTE_LCD
font_reset(&remote_font_ui);
#endif
}
/* 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 )
{
return pf->depth ?
(pf->height * width + 1) / 2:
width * ((pf->height + 7) / 8);
}
void font_reset(struct font *pf)
{
unsigned char* buffer = NULL;
size_t buf_size = 0;
if (pf == NULL)
pf = &font_ui;
else
{
buffer = pf->buffer_start;
buf_size = pf->buffer_size;
}
memset(pf, 0, sizeof(struct font));
pf->fd = -1;
if (buffer)
{
pf->buffer_start = buffer;
pf->buffer_size = buf_size;
}
}
static struct font* font_load_header(struct font *pf)
{
/* Check we have enough data */
if (!HAVEBYTES(28))
return NULL;
/* read magic and version #*/
if (memcmp(pf->buffer_position, VERSION, 4) != 0)
return NULL;
pf->buffer_position += 4;
/* font info*/
pf->maxwidth = readshort(pf);
pf->height = readshort(pf);
pf->ascent = readshort(pf);
pf->depth = readshort(pf);
pf->firstchar = readlong(pf);
pf->defaultchar = readlong(pf);
pf->size = readlong(pf);
/* get variable font data sizes*/
/* # words of bitmap_t*/
pf->bits_size = readlong(pf);
return pf;
}
/* Load memory font */
static struct font* font_load_in_memory(struct font* pf)
{
int32_t i, noffset, nwidth;
if (!HAVEBYTES(4))
return NULL;
/* # longs of offset*/
noffset = readlong(pf);
/* # bytes of width*/
nwidth = readlong(pf);
/* variable font data*/
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)
{
uint32_t noffset, nwidth;
unsigned char* oldfileptr = pf->buffer_position;
if (!HAVEBYTES(2 * sizeof(int32_t)))
return NULL;
/* # longs of offset*/
noffset = readlong(pf);
/* # bytes of width*/
nwidth = readlong(pf);
/* 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;
pf->buffer_position = oldfileptr;
/* Create the cache */
cache_create(pf);
return pf;
}
static bool internal_load_font(struct font* pf, const char *path,
char *buf, size_t buf_size)
{
int size;
/* save loaded glyphs */
glyph_cache_save(pf);
/* Close font file handle */
if (pf->fd >= 0)
close(pf->fd);
font_reset(pf);
/* open and read entire font file*/
pf->fd = open(path, O_RDONLY|O_BINARY);
if (pf->fd < 0) {
DEBUGF("Can't open font: %s\n", path);
return false;
}
/* Check file size */
size = filesize(pf->fd);
pf->buffer_start = buf;
pf->buffer_size = buf_size;
pf->buffer_position = buf;
if (size > pf->buffer_size)
{
read(pf->fd, pf->buffer_position, FONT_HEADER_SIZE);
pf->buffer_end = pf->buffer_position + FONT_HEADER_SIZE;
if (!font_load_header(pf))
{
DEBUGF("Failed font header load");
close(pf->fd);
pf->fd = -1;
return false;
}
if (!font_load_cached(pf))
{
DEBUGF("Failed font cache load");
close(pf->fd);
pf->fd = -1;
return false;
}
glyph_cache_load(pf);
}
else
{
read(pf->fd, pf->buffer_position, pf->buffer_size);
pf->buffer_end = pf->buffer_position + size;
close(pf->fd);
pf->fd = -1;
if (!font_load_header(pf))
{
DEBUGF("Failed font header load");
return false;
}
if (!font_load_in_memory(pf))
{
DEBUGF("Failed mem load");
return false;
}
}
return true;
}
#ifdef HAVE_REMOTE_LCD
/* Load a font into the special remote ui font slot */
int font_load_remoteui(const char* path)
{
struct font* pf = &remote_font_ui;
if (!path)
{
if (sysfonts[FONT_UI_REMOTE] && sysfonts[FONT_UI_REMOTE] != sysfonts[FONT_UI])
font_unload(FONT_UI_REMOTE);
sysfonts[FONT_UI_REMOTE] = NULL;
return FONT_UI;
}
if (!internal_load_font(pf, path, remote_buf, REMOTE_FONT_SIZE))
{
sysfonts[FONT_UI_REMOTE] = NULL;
return -1;
}
sysfonts[FONT_UI_REMOTE] = pf;
return FONT_UI_REMOTE;
}
#endif
/* read and load font into incore font structure,
* returns the font number on success, -1 on failure */
int font_load(struct font* pf, const char *path)
{
int font_id = -1;
char *buffer;
size_t buffer_size;
if (pf == NULL)
{
pf = &font_ui;
font_id = FONT_UI;
}
else
{
for (font_id = SYSTEMFONTCOUNT; font_id < MAXFONTS; font_id++)
{
if (sysfonts[font_id] == NULL)
break;
}
if (font_id == MAXFONTS)
return -1; /* too many fonts */
}
if (font_id == FONT_UI)
{
/* currently, font loading replaces earlier font allocation*/
buffer = (unsigned char *)(((intptr_t)main_buf + 3) & ~3);
/* make sure above doesn't exceed */
buffer_size = MAX_FONT_SIZE-3;
}
else
{
buffer = pf->buffer_start;
buffer_size = pf->buffer_size;
}
if (!internal_load_font(pf, path, buffer, buffer_size))
return -1;
sysfonts[font_id] = pf;
return font_id; /* success!*/
}
void font_unload(int font_id)
{
struct font* pf = sysfonts[font_id];
if (font_id >= SYSTEMFONTCOUNT && pf)
{
if (pf->fd >= 0)
close(pf->fd);
sysfonts[font_id] = NULL;
}
}
/*
* 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;
while (1) {
pf = sysfonts[font];
if (pf && pf->height)
return pf;
if (--font < 0)
panicf("No font!");
}
}
/*
* 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];
if (pf->file_width_offset)
{
int width_offset = pf->file_width_offset + char_code;
lseek(pf->fd, width_offset, SEEK_SET);
read(pf->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));
lseek(pf->fd, offset, SEEK_SET);
read (pf->fd, tmp, 2);
bitmap_offset = tmp[0] | (tmp[1] << 8);
if (pf->long_offset) {
read (pf->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);
}
/*
* 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 int cache_fd;
static void glyph_file_write(void* data)
{
struct font_cache_entry* p = data;
struct font* pf = &font_ui;
unsigned short ch;
unsigned char tmp[2];
if ( p->_char_code == 0xffff )
return;
ch = p->_char_code + pf->firstchar;
if ( cache_fd >= 0) {
tmp[0] = ch >> 8;
tmp[1] = ch & 0xff;
if (write(cache_fd, tmp, 2) != 2) {
close(cache_fd);
cache_fd = -1;
}
}
return;
}
/* save the char codes of the loaded glyphs to a file */
void glyph_cache_save(struct font* pf)
{
if (!pf)
pf = &font_ui;
if (pf->fd >= 0 && pf == &font_ui)
{
cache_fd = open(GLYPH_CACHE_FILE, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (cache_fd < 0)
return;
lru_traverse(&pf->cache._lru, glyph_file_write);
if (cache_fd >= 0)
{
close(cache_fd);
cache_fd = -1;
}
}
return;
}
int font_glyphs_to_bufsize(const char *path, int glyphs)
{
struct font f;
int bufsize;
char buf[FONT_HEADER_SIZE];
f.buffer_start = buf;
f.buffer_size = sizeof(buf);
f.buffer_position = buf;
f.fd = open(path, O_RDONLY|O_BINARY);
if(f.fd < 0)
return 0;
read(f.fd, f.buffer_position, FONT_HEADER_SIZE);
f.buffer_end = f.buffer_position + FONT_HEADER_SIZE;
if( !font_load_header(&f) )
{
close(f.fd);
return 0;
}
close(f.fd);
bufsize = LRU_SLOT_OVERHEAD + sizeof(struct font_cache_entry) +
sizeof( unsigned short);
bufsize += glyph_bytes(&f, f.maxwidth);
bufsize *= glyphs;
if ( bufsize < FONT_HEADER_SIZE )
bufsize = FONT_HEADER_SIZE;
return bufsize;
}
static int ushortcmp(const void *a, const void *b)
{
return ((int)(*(unsigned short*)a - *(unsigned short*)b));
}
static void glyph_cache_load(struct font* pf)
{
#define MAX_SORT 256
if (pf->fd >= 0) {
int fd;
int i, size;
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;
fd = open(GLYPH_CACHE_FILE, O_RDONLY|O_BINARY);
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 */
i = 0;
font_get_bits(pf, glyphs[i]);
for ( i = 1; i < size ; i++) {
if ( glyphs[i] != glyphs[i-1] )
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)
{
}
/*
* 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;
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;
return width;
}
/* -----------------------------------------------------------------
* vim: et sw=4 ts=8 sts=4 tw=78
*/
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