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cairo-truetype-subset.c
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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Red Hat, Inc.
*
* Contributor(s):
* Kristian Høgsberg <[email protected]>
* Adrian Johnson <[email protected]>
*/
/*
* Useful links:
* http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6.html
* http://www.microsoft.com/typography/specs/default.htm
*/
#define _BSD_SOURCE /* for snprintf(), strdup() */
#include "cairoint.h"
#include "cairo-array-private.h"
#include "cairo-error-private.h"
#if CAIRO_HAS_FONT_SUBSET
#include "cairo-scaled-font-subsets-private.h"
#include "cairo-truetype-subset-private.h"
typedef struct subset_glyph subset_glyph_t;
struct subset_glyph {
int parent_index;
unsigned long location;
};
typedef struct _cairo_truetype_font cairo_truetype_font_t;
typedef struct table table_t;
struct table {
unsigned long tag;
cairo_status_t (*write) (cairo_truetype_font_t *font, unsigned long tag);
int pos; /* position in the font directory */
};
struct _cairo_truetype_font {
cairo_scaled_font_subset_t *scaled_font_subset;
table_t truetype_tables[10];
int num_tables;
struct {
char *font_name;
char *ps_name;
unsigned int num_glyphs;
int *widths;
long x_min, y_min, x_max, y_max;
long ascent, descent;
int units_per_em;
} base;
subset_glyph_t *glyphs;
const cairo_scaled_font_backend_t *backend;
int num_glyphs_in_face;
int checksum_index;
cairo_array_t output;
cairo_array_t string_offsets;
unsigned long last_offset;
unsigned long last_boundary;
int *parent_to_subset;
cairo_status_t status;
cairo_bool_t is_pdf;
};
/*
* Test that the structs we define for TrueType tables have the
* correct size, ie. they are not padded.
*/
#define check(T, S) COMPILE_TIME_ASSERT (sizeof (T) == (S))
check (tt_head_t, 54);
check (tt_hhea_t, 36);
check (tt_maxp_t, 32);
check (tt_name_record_t, 12);
check (tt_name_t, 18);
check (tt_name_t, 18);
check (tt_composite_glyph_t, 16);
check (tt_glyph_data_t, 26);
#undef check
static cairo_status_t
cairo_truetype_font_use_glyph (cairo_truetype_font_t *font,
unsigned short glyph,
unsigned short *out);
#define SFNT_VERSION 0x00010000
#define SFNT_STRING_MAX_LENGTH 65535
static cairo_status_t
_cairo_truetype_font_set_error (cairo_truetype_font_t *font,
cairo_status_t status)
{
if (status == CAIRO_STATUS_SUCCESS ||
status == (int)CAIRO_INT_STATUS_UNSUPPORTED)
return status;
_cairo_status_set_error (&font->status, status);
return _cairo_error (status);
}
static cairo_status_t
_cairo_truetype_font_create (cairo_scaled_font_subset_t *scaled_font_subset,
cairo_bool_t is_pdf,
cairo_truetype_font_t **font_return)
{
cairo_status_t status;
cairo_truetype_font_t *font;
const cairo_scaled_font_backend_t *backend;
tt_head_t head;
tt_hhea_t hhea;
tt_maxp_t maxp;
unsigned long size;
backend = scaled_font_subset->scaled_font->backend;
if (!backend->load_truetype_table)
return CAIRO_INT_STATUS_UNSUPPORTED;
/* FIXME: We should either support subsetting vertical fonts, or fail on
* vertical. Currently font_options_t doesn't have vertical flag, but
* it should be added in the future. For now, the freetype backend
* returns UNSUPPORTED in load_truetype_table if the font is vertical.
*
* if (cairo_font_options_get_vertical_layout (scaled_font_subset->scaled_font))
* return CAIRO_INT_STATUS_UNSUPPORTED;
*/
/* We need to use a fallback font generated from the synthesized outlines. */
if (backend->is_synthetic && backend->is_synthetic (scaled_font_subset->scaled_font))
return CAIRO_INT_STATUS_UNSUPPORTED;
size = sizeof (tt_head_t);
status = backend->load_truetype_table (scaled_font_subset->scaled_font,
TT_TAG_head, 0,
(unsigned char *) &head,
&size);
if (unlikely (status))
return status;
size = sizeof (tt_maxp_t);
status = backend->load_truetype_table (scaled_font_subset->scaled_font,
TT_TAG_maxp, 0,
(unsigned char *) &maxp,
&size);
if (unlikely (status))
return status;
size = sizeof (tt_hhea_t);
status = backend->load_truetype_table (scaled_font_subset->scaled_font,
TT_TAG_hhea, 0,
(unsigned char *) &hhea,
&size);
if (unlikely (status))
return status;
font = malloc (sizeof (cairo_truetype_font_t));
if (unlikely (font == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
font->backend = backend;
font->num_glyphs_in_face = be16_to_cpu (maxp.num_glyphs);
font->scaled_font_subset = scaled_font_subset;
font->last_offset = 0;
font->last_boundary = 0;
_cairo_array_init (&font->output, sizeof (char));
status = _cairo_array_grow_by (&font->output, 4096);
if (unlikely (status))
goto fail1;
font->glyphs = calloc (font->num_glyphs_in_face + 1, sizeof (subset_glyph_t));
if (unlikely (font->glyphs == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail1;
}
font->parent_to_subset = calloc (font->num_glyphs_in_face, sizeof (int));
if (unlikely (font->parent_to_subset == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail2;
}
font->is_pdf = is_pdf;
font->base.num_glyphs = 0;
font->base.x_min = (int16_t) be16_to_cpu (head.x_min);
font->base.y_min = (int16_t) be16_to_cpu (head.y_min);
font->base.x_max = (int16_t) be16_to_cpu (head.x_max);
font->base.y_max = (int16_t) be16_to_cpu (head.y_max);
font->base.ascent = (int16_t) be16_to_cpu (hhea.ascender);
font->base.descent = (int16_t) be16_to_cpu (hhea.descender);
font->base.units_per_em = (int16_t) be16_to_cpu (head.units_per_em);
if (font->base.units_per_em == 0)
font->base.units_per_em = 2048;
font->base.ps_name = NULL;
font->base.font_name = NULL;
status = _cairo_truetype_read_font_name (scaled_font_subset->scaled_font,
&font->base.ps_name,
&font->base.font_name);
if (_cairo_status_is_error (status))
goto fail3;
/* If the PS name is not found, create a CairoFont-x-y name. */
if (font->base.ps_name == NULL) {
font->base.ps_name = malloc (30);
if (unlikely (font->base.ps_name == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail3;
}
snprintf(font->base.ps_name, 30, "CairoFont-%u-%u",
scaled_font_subset->font_id,
scaled_font_subset->subset_id);
}
font->base.widths = calloc (font->num_glyphs_in_face, sizeof (int));
if (unlikely (font->base.widths == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto fail4;
}
_cairo_array_init (&font->string_offsets, sizeof (unsigned long));
status = _cairo_array_grow_by (&font->string_offsets, 10);
if (unlikely (status))
goto fail5;
font->status = CAIRO_STATUS_SUCCESS;
*font_return = font;
return CAIRO_STATUS_SUCCESS;
fail5:
_cairo_array_fini (&font->string_offsets);
free (font->base.widths);
fail4:
free (font->base.ps_name);
fail3:
free (font->parent_to_subset);
free (font->base.font_name);
fail2:
free (font->glyphs);
fail1:
_cairo_array_fini (&font->output);
free (font);
return status;
}
static void
cairo_truetype_font_destroy (cairo_truetype_font_t *font)
{
_cairo_array_fini (&font->string_offsets);
free (font->base.widths);
free (font->base.ps_name);
free (font->base.font_name);
free (font->parent_to_subset);
free (font->glyphs);
_cairo_array_fini (&font->output);
free (font);
}
static cairo_status_t
cairo_truetype_font_allocate_write_buffer (cairo_truetype_font_t *font,
size_t length,
unsigned char **buffer)
{
cairo_status_t status;
if (font->status)
return font->status;
status = _cairo_array_allocate (&font->output, length, (void **) buffer);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
return CAIRO_STATUS_SUCCESS;
}
static void
cairo_truetype_font_write (cairo_truetype_font_t *font,
const void *data,
size_t length)
{
cairo_status_t status;
if (font->status)
return;
status = _cairo_array_append_multiple (&font->output, data, length);
if (unlikely (status))
status = _cairo_truetype_font_set_error (font, status);
}
static void
cairo_truetype_font_write_be16 (cairo_truetype_font_t *font,
uint16_t value)
{
uint16_t be16_value;
if (font->status)
return;
be16_value = cpu_to_be16 (value);
cairo_truetype_font_write (font, &be16_value, sizeof be16_value);
}
static void
cairo_truetype_font_write_be32 (cairo_truetype_font_t *font,
uint32_t value)
{
uint32_t be32_value;
if (font->status)
return;
be32_value = cpu_to_be32 (value);
cairo_truetype_font_write (font, &be32_value, sizeof be32_value);
}
static cairo_status_t
cairo_truetype_font_align_output (cairo_truetype_font_t *font,
unsigned long *aligned)
{
int length, pad;
unsigned char *padding;
length = _cairo_array_num_elements (&font->output);
*aligned = (length + 3) & ~3;
pad = *aligned - length;
if (pad) {
cairo_status_t status;
status = cairo_truetype_font_allocate_write_buffer (font, pad,
&padding);
if (unlikely (status))
return status;
memset (padding, 0, pad);
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_check_boundary (cairo_truetype_font_t *font,
unsigned long boundary)
{
cairo_status_t status;
if (font->status)
return font->status;
if (boundary - font->last_offset > SFNT_STRING_MAX_LENGTH)
{
status = _cairo_array_append (&font->string_offsets,
&font->last_boundary);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
font->last_offset = font->last_boundary;
}
font->last_boundary = boundary;
return CAIRO_STATUS_SUCCESS;
}
typedef struct _cmap_unicode_range {
unsigned int start;
unsigned int end;
} cmap_unicode_range_t;
static cmap_unicode_range_t winansi_unicode_ranges[] = {
{ 0x0020, 0x007f },
{ 0x00a0, 0x00ff },
{ 0x0152, 0x0153 },
{ 0x0160, 0x0161 },
{ 0x0178, 0x0178 },
{ 0x017d, 0x017e },
{ 0x0192, 0x0192 },
{ 0x02c6, 0x02c6 },
{ 0x02dc, 0x02dc },
{ 0x2013, 0x2026 },
{ 0x2030, 0x2030 },
{ 0x2039, 0x203a },
{ 0x20ac, 0x20ac },
{ 0x2122, 0x2122 },
};
static cairo_status_t
cairo_truetype_font_write_cmap_table (cairo_truetype_font_t *font,
unsigned long tag)
{
int i;
unsigned int j;
int range_offset;
int num_ranges;
int entry_selector;
int length;
num_ranges = ARRAY_LENGTH (winansi_unicode_ranges);
length = 16 + (num_ranges + 1)*8;
for (i = 0; i < num_ranges; i++)
length += (winansi_unicode_ranges[i].end - winansi_unicode_ranges[i].start + 1)*2;
entry_selector = 0;
while ((1 << entry_selector) <= (num_ranges + 1))
entry_selector++;
entry_selector--;
cairo_truetype_font_write_be16 (font, 0); /* Table version */
cairo_truetype_font_write_be16 (font, 1); /* Num tables */
cairo_truetype_font_write_be16 (font, 3); /* Platform */
cairo_truetype_font_write_be16 (font, 1); /* Encoding */
cairo_truetype_font_write_be32 (font, 12); /* Offset to start of table */
/* Output a format 4 encoding table for the winansi encoding */
cairo_truetype_font_write_be16 (font, 4); /* Format */
cairo_truetype_font_write_be16 (font, length); /* Length */
cairo_truetype_font_write_be16 (font, 0); /* Version */
cairo_truetype_font_write_be16 (font, num_ranges*2 + 2); /* 2*segcount */
cairo_truetype_font_write_be16 (font, (1 << (entry_selector + 1))); /* searchrange */
cairo_truetype_font_write_be16 (font, entry_selector); /* entry selector */
cairo_truetype_font_write_be16 (font, num_ranges*2 + 2 - (1 << (entry_selector + 1))); /* rangeshift */
for (i = 0; i < num_ranges; i++)
cairo_truetype_font_write_be16 (font, winansi_unicode_ranges[i].end); /* end count[] */
cairo_truetype_font_write_be16 (font, 0xffff); /* end count[] */
cairo_truetype_font_write_be16 (font, 0); /* reserved */
for (i = 0; i < num_ranges; i++)
cairo_truetype_font_write_be16 (font, winansi_unicode_ranges[i].start); /* startCode[] */
cairo_truetype_font_write_be16 (font, 0xffff); /* startCode[] */
for (i = 0; i < num_ranges; i++)
cairo_truetype_font_write_be16 (font, 0x0000); /* delta[] */
cairo_truetype_font_write_be16 (font, 1); /* delta[] */
range_offset = num_ranges*2 + 2;
for (i = 0; i < num_ranges; i++) {
cairo_truetype_font_write_be16 (font, range_offset); /* rangeOffset[] */
range_offset += (winansi_unicode_ranges[i].end - winansi_unicode_ranges[i].start + 1)*2 - 2;
}
cairo_truetype_font_write_be16 (font, 0); /* rangeOffset[] */
for (i = 0; i < num_ranges; i++) {
for (j = winansi_unicode_ranges[i].start; j < winansi_unicode_ranges[i].end + 1; j++) {
int ch = _cairo_unicode_to_winansi (j);
int glyph;
if (ch > 0)
glyph = font->scaled_font_subset->latin_to_subset_glyph_index[ch];
else
glyph = 0;
cairo_truetype_font_write_be16 (font, glyph);
}
}
return font->status;
}
static cairo_status_t
cairo_truetype_font_write_generic_table (cairo_truetype_font_t *font,
unsigned long tag)
{
cairo_status_t status;
unsigned char *buffer;
unsigned long size;
if (font->status)
return font->status;
size = 0;
status = font->backend->load_truetype_table(font->scaled_font_subset->scaled_font,
tag, 0, NULL, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
tag, 0, buffer, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_remap_composite_glyph (cairo_truetype_font_t *font,
unsigned char *buffer,
unsigned long size)
{
tt_glyph_data_t *glyph_data;
tt_composite_glyph_t *composite_glyph;
int num_args;
int has_more_components;
unsigned short flags;
unsigned short index;
cairo_status_t status;
unsigned char *end = buffer + size;
if (font->status)
return font->status;
glyph_data = (tt_glyph_data_t *) buffer;
if ((unsigned char *)(&glyph_data->data) >= end)
return CAIRO_INT_STATUS_UNSUPPORTED;
if ((int16_t)be16_to_cpu (glyph_data->num_contours) >= 0)
return CAIRO_STATUS_SUCCESS;
composite_glyph = &glyph_data->glyph;
do {
if ((unsigned char *)(&composite_glyph->args[1]) > end)
return CAIRO_INT_STATUS_UNSUPPORTED;
flags = be16_to_cpu (composite_glyph->flags);
has_more_components = flags & TT_MORE_COMPONENTS;
status = cairo_truetype_font_use_glyph (font, be16_to_cpu (composite_glyph->index), &index);
if (unlikely (status))
return status;
composite_glyph->index = cpu_to_be16 (index);
num_args = 1;
if (flags & TT_ARG_1_AND_2_ARE_WORDS)
num_args += 1;
if (flags & TT_WE_HAVE_A_SCALE)
num_args += 1;
else if (flags & TT_WE_HAVE_AN_X_AND_Y_SCALE)
num_args += 2;
else if (flags & TT_WE_HAVE_A_TWO_BY_TWO)
num_args += 4;
composite_glyph = (tt_composite_glyph_t *) &(composite_glyph->args[num_args]);
} while (has_more_components);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_write_glyf_table (cairo_truetype_font_t *font,
unsigned long tag)
{
unsigned long start_offset, index, size, next;
tt_head_t header;
unsigned long begin, end;
unsigned char *buffer;
unsigned int i;
union {
unsigned char *bytes;
uint16_t *short_offsets;
uint32_t *long_offsets;
} u;
cairo_status_t status;
if (font->status)
return font->status;
size = sizeof (tt_head_t);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_head, 0,
(unsigned char*) &header, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
if (be16_to_cpu (header.index_to_loc_format) == 0)
size = sizeof (int16_t) * (font->num_glyphs_in_face + 1);
else
size = sizeof (int32_t) * (font->num_glyphs_in_face + 1);
u.bytes = malloc (size);
if (unlikely (u.bytes == NULL))
return _cairo_truetype_font_set_error (font, CAIRO_STATUS_NO_MEMORY);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_loca, 0, u.bytes, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
start_offset = _cairo_array_num_elements (&font->output);
for (i = 0; i < font->base.num_glyphs; i++) {
index = font->glyphs[i].parent_index;
if (be16_to_cpu (header.index_to_loc_format) == 0) {
begin = be16_to_cpu (u.short_offsets[index]) * 2;
end = be16_to_cpu (u.short_offsets[index + 1]) * 2;
}
else {
begin = be32_to_cpu (u.long_offsets[index]);
end = be32_to_cpu (u.long_offsets[index + 1]);
}
/* quick sanity check... */
if (end < begin) {
status = CAIRO_INT_STATUS_UNSUPPORTED;
goto FAIL;
}
size = end - begin;
status = cairo_truetype_font_align_output (font, &next);
if (unlikely (status))
goto FAIL;
status = cairo_truetype_font_check_boundary (font, next);
if (unlikely (status))
goto FAIL;
font->glyphs[i].location = next - start_offset;
status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer);
if (unlikely (status))
goto FAIL;
if (size != 0) {
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_glyf, begin, buffer, &size);
if (unlikely (status))
goto FAIL;
status = cairo_truetype_font_remap_composite_glyph (font, buffer, size);
if (unlikely (status))
goto FAIL;
}
}
status = cairo_truetype_font_align_output (font, &next);
if (unlikely (status))
goto FAIL;
font->glyphs[i].location = next - start_offset;
status = font->status;
FAIL:
free (u.bytes);
return _cairo_truetype_font_set_error (font, status);
}
static cairo_status_t
cairo_truetype_font_write_head_table (cairo_truetype_font_t *font,
unsigned long tag)
{
unsigned char *buffer;
unsigned long size;
cairo_status_t status;
if (font->status)
return font->status;
size = 0;
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
tag, 0, NULL, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
font->checksum_index = _cairo_array_num_elements (&font->output) + 8;
status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
tag, 0, buffer, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
/* set checkSumAdjustment to 0 for table checksum calculation */
*(uint32_t *)(buffer + 8) = 0;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_write_hhea_table (cairo_truetype_font_t *font, unsigned long tag)
{
tt_hhea_t *hhea;
unsigned long size;
cairo_status_t status;
if (font->status)
return font->status;
size = sizeof (tt_hhea_t);
status = cairo_truetype_font_allocate_write_buffer (font, size, (unsigned char **) &hhea);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
tag, 0, (unsigned char *) hhea, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
hhea->num_hmetrics = cpu_to_be16 ((uint16_t)(font->base.num_glyphs));
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_write_hmtx_table (cairo_truetype_font_t *font,
unsigned long tag)
{
unsigned long size;
unsigned long long_entry_size;
unsigned long short_entry_size;
short *p;
unsigned int i;
tt_hhea_t hhea;
int num_hmetrics;
cairo_status_t status;
if (font->status)
return font->status;
size = sizeof (tt_hhea_t);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_hhea, 0,
(unsigned char*) &hhea, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
num_hmetrics = be16_to_cpu(hhea.num_hmetrics);
for (i = 0; i < font->base.num_glyphs; i++) {
long_entry_size = 2 * sizeof (int16_t);
short_entry_size = sizeof (int16_t);
status = cairo_truetype_font_allocate_write_buffer (font,
long_entry_size,
(unsigned char **) &p);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
if (font->glyphs[i].parent_index < num_hmetrics) {
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_hmtx,
font->glyphs[i].parent_index * long_entry_size,
(unsigned char *) p, &long_entry_size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
}
else
{
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_hmtx,
(num_hmetrics - 1) * long_entry_size,
(unsigned char *) p, &short_entry_size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_hmtx,
num_hmetrics * long_entry_size +
(font->glyphs[i].parent_index - num_hmetrics) * short_entry_size,
(unsigned char *) (p + 1), &short_entry_size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
}
font->base.widths[i] = be16_to_cpu (p[0]);
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_write_loca_table (cairo_truetype_font_t *font,
unsigned long tag)
{
unsigned int i;
tt_head_t header;
unsigned long size;
cairo_status_t status;
if (font->status)
return font->status;
size = sizeof(tt_head_t);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
TT_TAG_head, 0,
(unsigned char*) &header, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
if (be16_to_cpu (header.index_to_loc_format) == 0)
{
for (i = 0; i < font->base.num_glyphs + 1; i++)
cairo_truetype_font_write_be16 (font, font->glyphs[i].location / 2);
} else {
for (i = 0; i < font->base.num_glyphs + 1; i++)
cairo_truetype_font_write_be32 (font, font->glyphs[i].location);
}
return font->status;
}
static cairo_status_t
cairo_truetype_font_write_maxp_table (cairo_truetype_font_t *font,
unsigned long tag)
{
tt_maxp_t *maxp;
unsigned long size;
cairo_status_t status;
if (font->status)
return font->status;
size = sizeof (tt_maxp_t);
status = cairo_truetype_font_allocate_write_buffer (font, size, (unsigned char **) &maxp);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font,
tag, 0, (unsigned char *) maxp, &size);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
maxp->num_glyphs = cpu_to_be16 (font->base.num_glyphs);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
cairo_truetype_font_write_offset_table (cairo_truetype_font_t *font)
{
cairo_status_t status;
unsigned char *table_buffer;
size_t table_buffer_length;
unsigned short search_range, entry_selector, range_shift;
if (font->status)
return font->status;
search_range = 1;
entry_selector = 0;
while (search_range * 2 <= font->num_tables) {
search_range *= 2;
entry_selector++;
}
search_range *= 16;
range_shift = font->num_tables * 16 - search_range;
cairo_truetype_font_write_be32 (font, SFNT_VERSION);
cairo_truetype_font_write_be16 (font, font->num_tables);
cairo_truetype_font_write_be16 (font, search_range);
cairo_truetype_font_write_be16 (font, entry_selector);
cairo_truetype_font_write_be16 (font, range_shift);
/* Allocate space for the table directory. Each directory entry
* will be filled in by cairo_truetype_font_update_entry() after
* the table is written. */
table_buffer_length = font->num_tables * 16;
status = cairo_truetype_font_allocate_write_buffer (font, table_buffer_length,
&table_buffer);
if (unlikely (status))
return _cairo_truetype_font_set_error (font, status);
return CAIRO_STATUS_SUCCESS;
}
static uint32_t
cairo_truetype_font_calculate_checksum (cairo_truetype_font_t *font,
unsigned long start,
unsigned long end)
{
uint32_t *padded_end;
uint32_t *p;
uint32_t checksum;
char *data;
checksum = 0;
data = _cairo_array_index (&font->output, 0);
p = (uint32_t *) (data + start);
padded_end = (uint32_t *) (data + ((end + 3) & ~3));
while (p < padded_end)
checksum += be32_to_cpu(*p++);
return checksum;
}
static void
cairo_truetype_font_update_entry (cairo_truetype_font_t *font,
int index,
unsigned long tag,
unsigned long start,
unsigned long end)
{
uint32_t *entry;
entry = _cairo_array_index (&font->output, 12 + 16 * index);
entry[0] = cpu_to_be32 ((uint32_t)tag);
entry[1] = cpu_to_be32 (cairo_truetype_font_calculate_checksum (font, start, end));
entry[2] = cpu_to_be32 ((uint32_t)start);
entry[3] = cpu_to_be32 ((uint32_t)(end - start));
}
static cairo_status_t
cairo_truetype_font_generate (cairo_truetype_font_t *font,
const char **data,
unsigned long *length,
const unsigned long **string_offsets,
unsigned long *num_strings)
{
cairo_status_t status;
unsigned long start, end, next;
uint32_t checksum, *checksum_location;
int i;
if (font->status)
return font->status;
status = cairo_truetype_font_write_offset_table (font);
if (unlikely (status))
goto FAIL;
status = cairo_truetype_font_align_output (font, &start);
if (unlikely (status))
goto FAIL;
end = 0;
for (i = 0; i < font->num_tables; i++) {
status = font->truetype_tables[i].write (font, font->truetype_tables[i].tag);
if (unlikely (status))
goto FAIL;
end = _cairo_array_num_elements (&font->output);
status = cairo_truetype_font_align_output (font, &next);
if (unlikely (status))
goto FAIL;
cairo_truetype_font_update_entry (font, font->truetype_tables[i].pos,
font->truetype_tables[i].tag, start, end);
status = cairo_truetype_font_check_boundary (font, next);
if (unlikely (status))
goto FAIL;
start = next;
}
checksum =
0xb1b0afba - cairo_truetype_font_calculate_checksum (font, 0, end);
checksum_location = _cairo_array_index (&font->output, font->checksum_index);
*checksum_location = cpu_to_be32 (checksum);
*data = _cairo_array_index (&font->output, 0);
*length = _cairo_array_num_elements (&font->output);
*num_strings = _cairo_array_num_elements (&font->string_offsets);
if (*num_strings != 0)
*string_offsets = _cairo_array_index (&font->string_offsets, 0);
else
*string_offsets = NULL;
FAIL:
return _cairo_truetype_font_set_error (font, status);
}
static cairo_status_t
cairo_truetype_font_use_glyph (cairo_truetype_font_t *font,
unsigned short glyph,
unsigned short *out)
{
if (glyph >= font->num_glyphs_in_face)