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[script] Store fonts inside mmaped files.

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As an aide to tiny swapless systems write the rarely used bytes that
define type42 fonts into a deleted file and mmap them back into our
address space.
This commit is contained in:
Chris Wilson 2009-06-11 22:36:01 +01:00
parent 6167f27adf
commit 3aaea453b0
2 changed files with 78 additions and 16 deletions
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3
build/configure.ac.system
View file

@ -62,6 +62,9 @@ AC_CHECK_HEADERS([fcntl.h unistd.h signal.h sys/stat.h sys/socket.h sys/poll.h s
dnl check for CPU affinity support
AC_CHECK_HEADERS([sched.h], [AC_CHECK_FUNCS([sched_getaffinity])])
dnl check for mmap support
AC_CHECK_HEADERS([sys/mman.h], [AC_CHECK_FUNCS([mmap])])
dnl check for clock_gettime() support
save_LIBS="$LIBS"
LIBS="$LIBS $RT_LIBS"

91
util/cairo-script/cairo-script-operators.c
View file

@ -37,11 +37,16 @@
#include "cairo-script-private.h"
#include <stdio.h> /* snprintf */
#include <stdlib.h> /* mkstemp */
#include <string.h>
#include <math.h>
#include <limits.h> /* INT_MAX */
#include <assert.h>
#ifdef HAVE_MMAP
#include <sys/mman.h>
#endif
typedef struct _csi_proxy {
csi_t *ctx;
void *ptr;
@ -1541,13 +1546,53 @@ _ft_done_face (void *closure)
ctx->_faces = _csi_list_unlink (ctx->_faces, &data->blob.list);
if (--data->source->base.ref == 0)
csi_string_free (ctx, data->source);
if (data->source != NULL) {
if (--data->source->base.ref == 0)
csi_string_free (ctx, data->source);
} else {
#ifdef HAVE_MMAP
munmap (data->blob.bytes, data->blob.len);
#endif
}
_csi_slab_free (ctx, data, sizeof (*data));
cairo_script_interpreter_destroy (ctx);
}
#ifdef HAVE_MMAP
/* manual form of swapping for swapless systems like tiny */
static void *
_mmap_bytes (const uint8_t *bytes, size_t num_bytes)
{
char template[] = "/tmp/csi-font.XXXXXX";
size_t len;
void *ptr;
int fd;
fd = mkstemp (template);
if (fd == -1)
return MAP_FAILED;
unlink (template);
len = num_bytes;
while (len) {
int ret = write (fd, bytes, len);
if (ret < 0) {
close (fd);
return MAP_FAILED;
}
len -= ret;
bytes += ret;
}
ptr = mmap (NULL, num_bytes, PROT_READ, MAP_SHARED, fd, 0);
close (fd);
return ptr;
}
#endif
static csi_status_t
_ft_create_for_source (csi_t *ctx,
csi_string_t *source,
@ -1557,7 +1602,6 @@ _ft_create_for_source (csi_t *ctx,
csi_blob_t tmpl;
struct _ft_face_data *data;
csi_list_t *link;
FT_Face face;
FT_Error err;
cairo_font_face_t *font_face;
csi_status_t status;
@ -1581,27 +1625,42 @@ _ft_create_for_source (csi_t *ctx,
return _csi_error (CSI_STATUS_NO_MEMORY);
}
data = _csi_slab_alloc (ctx, sizeof (*data));
data->face = NULL;
ctx->_faces = _csi_list_prepend (ctx->_faces, &data->blob.list);
data->ctx = cairo_script_interpreter_reference (ctx);
data->blob.hash = tmpl.hash;
data->blob.len = tmpl.len;
#ifdef HAVE_MMAP
data->blob.bytes = _mmap_bytes (tmpl.bytes, tmpl.len);
if (data->blob.bytes != MAP_FAILED) {
data->source = NULL;
if (--source->base.ref == 0)
csi_string_free (ctx, source);
} else {
data->blob.bytes = tmpl.bytes;
data->source = source;
}
#else
data->blob.bytes = tmpl.bytes;
data->source = source;
#endif
err = FT_New_Memory_Face (_ft_lib,
(uint8_t *) source->string,
source->len, index,
&face);
data->blob.bytes,
data->blob.len,
index,
&data->face);
if (_csi_unlikely (err != FT_Err_Ok)) {
_ft_done_face (data);
if (err == FT_Err_Out_Of_Memory)
return _csi_error (CSI_STATUS_NO_MEMORY);
return _csi_error (CSI_STATUS_INVALID_SCRIPT);
}
data = _csi_slab_alloc (ctx, sizeof (*data));
ctx->_faces = _csi_list_prepend (ctx->_faces, &data->blob.list);
data->ctx = cairo_script_interpreter_reference (ctx);
data->blob.hash = tmpl.hash;
data->blob.bytes = tmpl.bytes;
data->blob.len = tmpl.len;
data->face = face;
data->source = source;
font_face = cairo_ft_font_face_create_for_ft_face (face, load_flags);
font_face = cairo_ft_font_face_create_for_ft_face (data->face, load_flags);
status = cairo_font_face_set_user_data (font_face,
&_csi_blob_key,
data, _ft_done_face);