Remove pixman from SNAPSHOT_0_5_2SNAPSHOT_0_5_2

1 files changed, 649 insertions, 0 deletions

diff --git a/src/cairo-font-subset.c b/src/cairo-font-subset.c
new file mode 100644
index 000000000..e3a2784cf
--- /dev/null
+++ b/src/cairo-font-subset.c
@@ -0,0 +1,649 @@
+/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <krh@redhat.com>
+ */
+
+#include "cairoint.h"
+#include "cairo-pdf.h"
+/* XXX: Eventually, we need to handle other font backends */
+#include "cairo-font-subset-private.h"
+#include "cairo-ft-private.h"
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_OUTLINE_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_TRUETYPE_TABLES_H
+
+typedef struct ft_subset_glyph ft_subset_glyph_t;
+struct ft_subset_glyph {
+    int parent_index;
+    unsigned long location;
+};
+
+struct cairo_font_subset_backend {
+    int			(*use_glyph)	(void *abstract_font,
+					 int glyph);
+    cairo_status_t	(*generate)	(void *abstract_font,
+					 const char **data,
+					 unsigned long *length);
+    void		(*destroy)	(void *abstract_font);
+};
+
+typedef struct cairo_pdf_ft_font cairo_pdf_ft_font_t;
+struct cairo_pdf_ft_font {
+    cairo_font_subset_t base;
+    ft_subset_glyph_t *glyphs;
+    FT_Face face;
+    int checksum_index;
+    cairo_array_t output;
+    int *parent_to_subset;
+    cairo_status_t status;
+};
+
+#define ARRAY_LENGTH(a) ( (sizeof (a)) / (sizeof ((a)[0])) )
+
+#define SFNT_VERSION			0x00010000
+
+#ifdef WORDS_BIGENDIAN
+
+#define cpu_to_be16(v) (v)
+#define be16_to_cpu(v) (v)
+#define cpu_to_be32(v) (v)
+#define be32_to_cpu(v) (v)
+
+#else
+
+static inline unsigned short
+cpu_to_be16(unsigned short v)
+{
+    return (v << 8) | (v >> 8);
+}
+
+static inline unsigned short
+be16_to_cpu(unsigned short v)
+{
+    return cpu_to_be16 (v);
+}
+
+static inline unsigned long
+cpu_to_be32(unsigned long v)
+{
+    return (cpu_to_be16 (v) << 16) | cpu_to_be16 (v >> 16);
+}
+
+static inline unsigned long
+be32_to_cpu(unsigned long v)
+{
+    return cpu_to_be32 (v);
+}
+
+#endif
+
+static cairo_font_subset_backend_t cairo_pdf_ft_font_backend;
+
+int
+_cairo_font_subset_use_glyph (cairo_font_subset_t *font, int glyph)
+{
+    return font->backend->use_glyph (font, glyph);
+}
+
+cairo_status_t
+_cairo_font_subset_generate (cairo_font_subset_t *font,
+			 const char **data, unsigned long *length)
+{
+    return font->backend->generate (font, data, length);
+}
+
+void
+_cairo_font_subset_destroy (cairo_font_subset_t *font)
+{
+    font->backend->destroy (font);
+}
+
+cairo_font_subset_t *
+_cairo_font_subset_create (cairo_unscaled_font_t *unscaled_font)
+{
+    FT_Face face;
+    cairo_pdf_ft_font_t *font;
+    unsigned long size;
+    int i, j;
+
+    /* XXX: Need to fix this to work with a general cairo_unscaled_font_t. */
+    if (! _cairo_unscaled_font_is_ft (unscaled_font))
+	return NULL;
+
+    face = _cairo_ft_unscaled_font_lock_face (unscaled_font);
+
+    /* We currently only support freetype truetype fonts. */
+    size = 0;
+    if (!FT_IS_SFNT (face) ||
+	FT_Load_Sfnt_Table (face, TTAG_glyf, 0, NULL, &size) != 0)
+	return NULL;
+
+    font = malloc (sizeof (cairo_pdf_ft_font_t));
+    if (font == NULL)
+	return NULL;
+
+    font->base.unscaled_font = unscaled_font;
+    _cairo_unscaled_font_reference (unscaled_font);
+    font->base.backend = &cairo_pdf_ft_font_backend;
+
+    _cairo_array_init (&font->output, sizeof (char));
+    if (_cairo_array_grow_by (&font->output, 4096) != CAIRO_STATUS_SUCCESS)
+	goto fail1;
+
+    font->glyphs = calloc (face->num_glyphs + 1, sizeof (ft_subset_glyph_t));
+    if (font->glyphs == NULL)
+	goto fail2;
+
+    font->parent_to_subset = calloc (face->num_glyphs, sizeof (int));
+    if (font->parent_to_subset == NULL)
+	goto fail3;
+
+    font->base.num_glyphs = 1;
+    font->base.x_min = face->bbox.xMin;
+    font->base.y_min = face->bbox.yMin;
+    font->base.x_max = face->bbox.xMax;
+    font->base.y_max = face->bbox.yMax;
+    font->base.ascent = face->ascender;
+    font->base.descent = face->descender;
+    font->base.base_font = strdup (face->family_name);
+    if (font->base.base_font == NULL)
+	goto fail4;
+
+    for (i = 0, j = 0; font->base.base_font[j]; j++) {
+	if (font->base.base_font[j] == ' ')
+	    continue;
+	font->base.base_font[i++] = font->base.base_font[j];
+    }
+    font->base.base_font[i] = '\0';
+
+    font->base.widths = calloc (face->num_glyphs, sizeof (int));
+    if (font->base.widths == NULL)
+	goto fail5;
+
+    _cairo_ft_unscaled_font_unlock_face (unscaled_font);
+
+    font->status = CAIRO_STATUS_SUCCESS;
+
+    return &font->base;
+
+ fail5:
+    free (font->base.base_font);
+ fail4:
+    free (font->parent_to_subset);
+ fail3:
+    free (font->glyphs);
+ fail2:
+    _cairo_array_fini (&font->output);
+ fail1:
+    free (font);
+    return NULL;
+}
+
+static void
+cairo_pdf_ft_font_destroy (void *abstract_font)
+{
+    cairo_pdf_ft_font_t *font = abstract_font;
+
+    _cairo_unscaled_font_destroy (font->base.unscaled_font);
+    free (font->base.base_font);
+    free (font->parent_to_subset);
+    free (font->glyphs);
+    _cairo_array_fini (&font->output);
+    free (font);
+}
+
+static void *
+cairo_pdf_ft_font_write (cairo_pdf_ft_font_t *font,
+			 const void *data, size_t length)
+{
+    void *p;
+
+    p = _cairo_array_append (&font->output, data, length);
+    if (p == NULL)
+	font->status = CAIRO_STATUS_NO_MEMORY;
+
+    return p;
+}
+
+static void
+cairo_pdf_ft_font_write_be16 (cairo_pdf_ft_font_t *font,
+			      unsigned short value)
+{
+    unsigned short be16_value;
+
+    be16_value = cpu_to_be16 (value);
+    cairo_pdf_ft_font_write (font, &be16_value, sizeof be16_value);
+}
+
+static void
+cairo_pdf_ft_font_write_be32 (cairo_pdf_ft_font_t *font, unsigned long value)
+{
+    unsigned long be32_value;
+
+    be32_value = cpu_to_be32 (value);
+    cairo_pdf_ft_font_write (font, &be32_value, sizeof be32_value);
+}
+
+static unsigned long
+cairo_pdf_ft_font_align_output (cairo_pdf_ft_font_t *font)
+{
+    int length, aligned;
+    static const char pad[4];
+
+    length = _cairo_array_num_elements (&font->output);
+    aligned = (length + 3) & ~3;
+    cairo_pdf_ft_font_write (font, pad, aligned - length);
+
+    return aligned;
+}
+
+static int
+cairo_pdf_ft_font_write_cmap_table (cairo_pdf_ft_font_t *font, unsigned long tag)
+{
+    int i;
+
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be16 (font, 1);
+
+    cairo_pdf_ft_font_write_be16 (font, 1);
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be32 (font, 12);
+
+    /* Output a format 6 encoding table. */
+
+    cairo_pdf_ft_font_write_be16 (font, 6);
+    cairo_pdf_ft_font_write_be16 (font, 10 + 2 * (font->base.num_glyphs - 1));
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be16 (font, 1); /* First glyph */
+    cairo_pdf_ft_font_write_be16 (font, font->base.num_glyphs - 1);
+    for (i = 1; i < font->base.num_glyphs; i++)
+	cairo_pdf_ft_font_write_be16 (font, i);
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_write_generic_table (cairo_pdf_ft_font_t *font,
+				       unsigned long tag)
+{
+    unsigned char *buffer;
+    unsigned long size;
+
+    size = 0;
+    FT_Load_Sfnt_Table (font->face, tag, 0, NULL, &size);
+    buffer = cairo_pdf_ft_font_write (font, NULL, size);
+    FT_Load_Sfnt_Table (font->face, tag, 0, buffer, &size);
+    
+    return 0;
+}
+
+static int
+cairo_pdf_ft_font_write_glyf_table (cairo_pdf_ft_font_t *font,
+				    unsigned long tag)
+{
+    unsigned long start_offset, index, size;
+    TT_Header *header;
+    unsigned long begin, end;
+    unsigned char *buffer;
+    int i;
+    union {
+	unsigned char *bytes;
+	unsigned short *short_offsets;
+	unsigned long *long_offsets;
+    } u;
+
+    header = FT_Get_Sfnt_Table (font->face, ft_sfnt_head);
+    if (header->Index_To_Loc_Format == 0)
+	size = sizeof (short) * (font->face->num_glyphs + 1);
+    else
+	size = sizeof (long) * (font->face->num_glyphs + 1);
+
+    u.bytes = malloc (size);
+    if (u.bytes == NULL) {
+	font->status = CAIRO_STATUS_NO_MEMORY;
+	return font->status;
+    }
+    FT_Load_Sfnt_Table (font->face, TTAG_loca, 0, u.bytes, &size);
+
+    start_offset = _cairo_array_num_elements (&font->output);
+    for (i = 0; i < font->base.num_glyphs; i++) {
+	index = font->glyphs[i].parent_index;
+	if (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]);
+	}
+
+	size = end - begin;
+
+	font->glyphs[i].location =
+	    cairo_pdf_ft_font_align_output (font) - start_offset;
+	buffer = cairo_pdf_ft_font_write (font, NULL, size);
+	if (buffer == NULL)
+	    break;
+	FT_Load_Sfnt_Table (font->face, TTAG_glyf, begin, buffer, &size);
+	/* FIXME: remap composite glyphs */
+    }
+
+    font->glyphs[i].location =
+	cairo_pdf_ft_font_align_output (font) - start_offset;
+
+    free (u.bytes);
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_write_head_table (cairo_pdf_ft_font_t *font,
+				    unsigned long tag)
+{
+    TT_Header *head;
+
+    head = FT_Get_Sfnt_Table (font->face, ft_sfnt_head);
+
+    cairo_pdf_ft_font_write_be32 (font, head->Table_Version);
+    cairo_pdf_ft_font_write_be32 (font, head->Font_Revision);
+
+    font->checksum_index = _cairo_array_num_elements (&font->output);
+    cairo_pdf_ft_font_write_be32 (font, 0);
+    cairo_pdf_ft_font_write_be32 (font, head->Magic_Number);
+
+    cairo_pdf_ft_font_write_be16 (font, head->Flags);
+    cairo_pdf_ft_font_write_be16 (font, head->Units_Per_EM);
+
+    cairo_pdf_ft_font_write_be32 (font, head->Created[0]);
+    cairo_pdf_ft_font_write_be32 (font, head->Created[1]);
+    cairo_pdf_ft_font_write_be32 (font, head->Modified[0]);
+    cairo_pdf_ft_font_write_be32 (font, head->Modified[1]);
+
+    cairo_pdf_ft_font_write_be16 (font, head->xMin);
+    cairo_pdf_ft_font_write_be16 (font, head->yMin);
+    cairo_pdf_ft_font_write_be16 (font, head->xMax);
+    cairo_pdf_ft_font_write_be16 (font, head->yMax);
+
+    cairo_pdf_ft_font_write_be16 (font, head->Mac_Style);
+    cairo_pdf_ft_font_write_be16 (font, head->Lowest_Rec_PPEM);
+
+    cairo_pdf_ft_font_write_be16 (font, head->Font_Direction);
+    cairo_pdf_ft_font_write_be16 (font, head->Index_To_Loc_Format);
+    cairo_pdf_ft_font_write_be16 (font, head->Glyph_Data_Format);
+
+    return font->status;
+}
+
+static int cairo_pdf_ft_font_write_hhea_table (cairo_pdf_ft_font_t *font, unsigned long tag)
+{
+    TT_HoriHeader *hhea;
+
+    hhea = FT_Get_Sfnt_Table (font->face, ft_sfnt_hhea);
+
+    cairo_pdf_ft_font_write_be32 (font, hhea->Version);
+    cairo_pdf_ft_font_write_be16 (font, hhea->Ascender);
+    cairo_pdf_ft_font_write_be16 (font, hhea->Descender);
+    cairo_pdf_ft_font_write_be16 (font, hhea->Line_Gap);
+
+    cairo_pdf_ft_font_write_be16 (font, hhea->advance_Width_Max);
+
+    cairo_pdf_ft_font_write_be16 (font, hhea->min_Left_Side_Bearing);
+    cairo_pdf_ft_font_write_be16 (font, hhea->min_Right_Side_Bearing);
+    cairo_pdf_ft_font_write_be16 (font, hhea->xMax_Extent);
+    cairo_pdf_ft_font_write_be16 (font, hhea->caret_Slope_Rise);
+    cairo_pdf_ft_font_write_be16 (font, hhea->caret_Slope_Run);
+    cairo_pdf_ft_font_write_be16 (font, hhea->caret_Offset);
+
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be16 (font, 0);
+    cairo_pdf_ft_font_write_be16 (font, 0);
+
+    cairo_pdf_ft_font_write_be16 (font, hhea->metric_Data_Format);
+    cairo_pdf_ft_font_write_be16 (font, font->base.num_glyphs);
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_write_hmtx_table (cairo_pdf_ft_font_t *font,
+				    unsigned long tag)
+{
+    unsigned long entry_size;
+    short *p;
+    int i;
+
+    for (i = 0; i < font->base.num_glyphs; i++) {
+	entry_size = 2 * sizeof (short);
+	p = cairo_pdf_ft_font_write (font, NULL, entry_size);
+	FT_Load_Sfnt_Table (font->face, TTAG_hmtx, 
+			    font->glyphs[i].parent_index * entry_size,
+			    (FT_Byte *) p, &entry_size);
+	font->base.widths[i] = be16_to_cpu (p[0]);
+    }
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_write_loca_table (cairo_pdf_ft_font_t *font,
+				    unsigned long tag)
+{
+    int i;
+    TT_Header *header;
+
+    header = FT_Get_Sfnt_Table (font->face, ft_sfnt_head);
+
+    if (header->Index_To_Loc_Format == 0) {
+	for (i = 0; i < font->base.num_glyphs + 1; i++)
+	    cairo_pdf_ft_font_write_be16 (font, font->glyphs[i].location / 2);
+    }
+    else {
+	for (i = 0; i < font->base.num_glyphs + 1; i++)
+	    cairo_pdf_ft_font_write_be32 (font, font->glyphs[i].location);
+    }
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_write_maxp_table (cairo_pdf_ft_font_t *font,
+				    unsigned long tag)
+{
+    TT_MaxProfile *maxp;
+
+    maxp = FT_Get_Sfnt_Table (font->face, ft_sfnt_maxp);
+    
+    cairo_pdf_ft_font_write_be32 (font, maxp->version);
+    cairo_pdf_ft_font_write_be16 (font, font->base.num_glyphs);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxPoints);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxContours);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxCompositePoints);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxCompositeContours);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxZones);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxTwilightPoints);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxStorage);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxFunctionDefs);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxInstructionDefs);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxStackElements);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxSizeOfInstructions);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxComponentElements);
+    cairo_pdf_ft_font_write_be16 (font, maxp->maxComponentDepth);
+
+    return font->status;
+}
+
+typedef struct table table_t;
+struct table {
+    unsigned long tag;
+    int (*write) (cairo_pdf_ft_font_t *font, unsigned long tag);
+};
+
+static const table_t truetype_tables[] = {
+    { TTAG_cmap, cairo_pdf_ft_font_write_cmap_table },
+    { TTAG_cvt,  cairo_pdf_ft_font_write_generic_table },
+    { TTAG_fpgm, cairo_pdf_ft_font_write_generic_table },
+    { TTAG_glyf, cairo_pdf_ft_font_write_glyf_table },
+    { TTAG_head, cairo_pdf_ft_font_write_head_table },
+    { TTAG_hhea, cairo_pdf_ft_font_write_hhea_table },
+    { TTAG_hmtx, cairo_pdf_ft_font_write_hmtx_table },
+    { TTAG_loca, cairo_pdf_ft_font_write_loca_table },
+    { TTAG_maxp, cairo_pdf_ft_font_write_maxp_table },
+    { TTAG_name, cairo_pdf_ft_font_write_generic_table },
+    { TTAG_prep, cairo_pdf_ft_font_write_generic_table },
+};
+
+static cairo_status_t
+cairo_pdf_ft_font_write_offset_table (cairo_pdf_ft_font_t *font)
+{
+    unsigned short search_range, entry_selector, range_shift;
+    int num_tables;
+
+    num_tables = ARRAY_LENGTH (truetype_tables);
+    search_range = 1;
+    entry_selector = 0;
+    while (search_range * 2 <= num_tables) {
+	search_range *= 2;
+	entry_selector++;
+    }
+    search_range *= 16;
+    range_shift = num_tables * 16 - search_range;
+
+    cairo_pdf_ft_font_write_be32 (font, SFNT_VERSION);
+    cairo_pdf_ft_font_write_be16 (font, num_tables);
+    cairo_pdf_ft_font_write_be16 (font, search_range);
+    cairo_pdf_ft_font_write_be16 (font, entry_selector);
+    cairo_pdf_ft_font_write_be16 (font, range_shift);
+
+    cairo_pdf_ft_font_write (font, NULL, ARRAY_LENGTH (truetype_tables) * 16);
+
+    return font->status;
+}    
+
+static unsigned long
+cairo_pdf_ft_font_calculate_checksum (cairo_pdf_ft_font_t *font,
+			   unsigned long start, unsigned long end)
+{
+    unsigned long *padded_end;
+    unsigned long *p;
+    unsigned long checksum;
+    char *data;
+
+    checksum = 0; 
+    data = _cairo_array_index (&font->output, 0);
+    p = (unsigned long *) (data + start);
+    padded_end = (unsigned long *) (data + ((end + 3) & ~3));
+    while (p < padded_end)
+	checksum += *p++;
+
+    return checksum;
+}
+
+static void
+cairo_pdf_ft_font_update_entry (cairo_pdf_ft_font_t *font, int index, unsigned long tag,
+			unsigned long start, unsigned long end)
+{
+    unsigned long *entry;
+
+    entry = _cairo_array_index (&font->output, 12 + 16 * index);
+    entry[0] = cpu_to_be32 (tag);
+    entry[1] = cpu_to_be32 (cairo_pdf_ft_font_calculate_checksum (font, start, end));
+    entry[2] = cpu_to_be32 (start);
+    entry[3] = cpu_to_be32 (end - start);
+}
+
+static cairo_status_t
+cairo_pdf_ft_font_generate (void *abstract_font,
+			    const char **data, unsigned long *length)
+{
+    cairo_pdf_ft_font_t *font = abstract_font;
+    unsigned long start, end, next, checksum, *checksum_location;
+    int i;
+
+    font->face = _cairo_ft_unscaled_font_lock_face (font->base.unscaled_font);
+
+    if (cairo_pdf_ft_font_write_offset_table (font))
+	goto fail;
+
+    start = cairo_pdf_ft_font_align_output (font);
+    end = start;
+
+    end = 0;
+    for (i = 0; i < ARRAY_LENGTH (truetype_tables); i++) {
+	if (truetype_tables[i].write (font, truetype_tables[i].tag))
+	    goto fail;
+
+	end = _cairo_array_num_elements (&font->output);
+	next = cairo_pdf_ft_font_align_output (font);
+	cairo_pdf_ft_font_update_entry (font, i, truetype_tables[i].tag,
+					start, end);
+	start = next;
+    }
+
+    checksum =
+	0xb1b0afba - cairo_pdf_ft_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);
+
+ fail:
+    _cairo_ft_unscaled_font_unlock_face (font->base.unscaled_font);      
+    font->face = NULL;
+
+    return font->status;
+}
+
+static int
+cairo_pdf_ft_font_use_glyph (void *abstract_font, int glyph)
+{
+    cairo_pdf_ft_font_t *font = abstract_font;
+
+    if (font->parent_to_subset[glyph] == 0) {
+	font->parent_to_subset[glyph] = font->base.num_glyphs;
+	font->glyphs[font->base.num_glyphs].parent_index = glyph;
+	font->base.num_glyphs++;
+    }
+
+    return font->parent_to_subset[glyph];
+}
+
+static cairo_font_subset_backend_t cairo_pdf_ft_font_backend = {
+    cairo_pdf_ft_font_use_glyph,
+    cairo_pdf_ft_font_generate,
+    cairo_pdf_ft_font_destroy
+};