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Faster cached font loading. FS#12333 

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30769 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Fred Bauer 2011-10-17 13:17:04 +00:00
parent afc42ff793
commit 8c9017211e
3 changed files with 39 additions and 5 deletions
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2
firmware/export/font.h
View File

@ -100,6 +100,8 @@ struct font {
/* file, buffer and cache management */
int fd; /* fd for the font file. >= 0 if cached */
int fd_width; /* fd for the font file. >= 0 if cached */
int fd_offset; /* fd for the font file. >= 0 if cached */
unsigned char *buffer_start; /* buffer to store the font in */
unsigned char *buffer_position; /* position in the buffer */
unsigned char *buffer_end; /* end of the buffer */

40
firmware/font.c
View File

@ -394,7 +394,22 @@ static bool internal_load_font(int font_id, const char *path, char *buf,
return false;
}
/* Cheat to get sector cache for different parts of font *
* file while preloading glyphs. Without this the disk head *
* thrashes between the width, offset, and bitmap data *
* in glyph_cache_load(). */
pf->fd_width = open(path, O_RDONLY|O_BINARY);
pf->fd_offset = open(path, O_RDONLY|O_BINARY);
glyph_cache_load(font_id);
if(pf->fd_width >= 0)
close(pf->fd_width);
pf->fd_width = -1;
if(pf->fd_offset >= 0)
close(pf->fd_offset);
pf->fd_offset = -1;
}
else
{
@ -402,6 +417,8 @@ static bool internal_load_font(int font_id, const char *path, char *buf,
pf->buffer_end = pf->buffer_position + size;
close(pf->fd);
pf->fd = -1;
pf->fd_width = -1;
pf->fd_offset = -1;
if (!font_load_header(pf))
{
@ -451,6 +468,8 @@ static int alloc_and_init(int font_idx, const char* name, size_t size)
pdata->refcount = 1;
pf->buffer_position = pf->buffer_start = buffer_from_handle(handle);
pf->buffer_size = size;
pf->fd_width = -1;
pf->fd_offset = -1;
return handle;
}
@ -639,14 +658,20 @@ load_cache_entry(struct font_cache_entry* p, void* callback_data)
int handle = pf_to_handle(pf);
unsigned short char_code = p->_char_code;
unsigned char tmp[2];
int fd;
if (handle > 0)
lock_font_handle(handle, true);
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);
/* 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
{
@ -658,11 +683,16 @@ load_cache_entry(struct font_cache_entry* p, void* callback_data)
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);
/* 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 (pf->fd, tmp, 2);
read (fd, tmp, 2);
bitmap_offset |= (tmp[0] << 16) | (tmp[1] << 24);
}
}

2
tools/convbdf.c
View File

@ -1401,6 +1401,8 @@ int gen_c_source(struct font* pf, char *path)
" %d, /* defaultchar */\n"
" %d, /* bits_size */\n"
" -1, /* font fd */\n"
" -1, /* font fd width */\n"
" -1, /* font fd offset */\n"
" 0, /* buffer start */\n"
" 0, /* ^ position */\n"
" 0, /* ^ end */\n"