fdo-mirrors/cairo
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/cairo/cairo.git synced 2026-05-04 16:28:09 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions
cairo/src/cairo-ft-font.c
Carl Worth e2bb36fe08 wAdd proper error propagation to _cairo_matrix_compute_scale_factors 
Before there was just an assert statement here that the
determinant of the matrix was not infinite. That was bogus
since a user-provided can end up here. So instead, do the
correct error propagation of any CAIRO_STATUS_INVALID_MATRIX
error as necessary.

This eliminates the current failure of the invalid-matrix
test case.
2008-01-29 09:01:00 -08:00

2684 lines
76 KiB
C
Raw Blame History

/* cairo - a vector graphics library with display and print output
*
* Copyright © 2000 Keith Packard
* Copyright © 2005 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):
* Graydon Hoare <graydon@redhat.com>
* Owen Taylor <otaylor@redhat.com>
* Keith Packard <keithp@keithp.com>
* Carl Worth <cworth@cworth.org>
*/
#include "cairoint.h"
#include "cairo-ft-private.h"
#include <float.h>
#include <fontconfig/fontconfig.h>
#include <fontconfig/fcfreetype.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_IMAGE_H
#include FT_TRUETYPE_TABLES_H
#if HAVE_FT_GLYPHSLOT_EMBOLDEN
#include FT_SYNTHESIS_H
#endif
#define DOUBLE_TO_26_6(d) ((FT_F26Dot6)((d) * 64.0))
#define DOUBLE_FROM_26_6(t) ((double)(t) / 64.0)
#define DOUBLE_TO_16_16(d) ((FT_Fixed)((d) * 65536.0))
#define DOUBLE_FROM_16_16(t) ((double)(t) / 65536.0)
/* This is the max number of FT_face objects we keep open at once
*/
#define MAX_OPEN_FACES 10
/*
* The simple 2x2 matrix is converted into separate scale and shape
* factors so that hinting works right
*/
typedef struct _cairo_ft_font_transform {
double x_scale, y_scale;
double shape[2][2];
} cairo_ft_font_transform_t;
/*
* We create an object that corresponds to a single font on the disk;
* (identified by a filename/id pair) these are shared between all
* fonts using that file. For cairo_ft_font_face_create_for_ft_face(), we
* just create a one-off version with a permanent face value.
*/
typedef struct _cairo_ft_font_face cairo_ft_font_face_t;
struct _cairo_ft_unscaled_font {
cairo_unscaled_font_t base;
cairo_bool_t from_face; /* from cairo_ft_font_face_create_for_ft_face()? */
FT_Face face; /* provided or cached face */
/* only set if from_face is false */
char *filename;
int id;
/* We temporarily scale the unscaled font as needed */
cairo_bool_t have_scale;
cairo_matrix_t current_scale;
double x_scale; /* Extracted X scale factor */
double y_scale; /* Extracted Y scale factor */
cairo_bool_t have_shape; /* true if the current scale has a non-scale component*/
cairo_matrix_t current_shape;
FT_Matrix Current_Shape;
cairo_mutex_t mutex;
int lock_count;
cairo_ft_font_face_t *faces; /* Linked list of faces for this font */
};
static int
_cairo_ft_unscaled_font_keys_equal (const void *key_a,
const void *key_b);
static void
_cairo_ft_unscaled_font_fini (cairo_ft_unscaled_font_t *unscaled);
static cairo_status_t
_cairo_ft_font_options_substitute (const cairo_font_options_t *options,
FcPattern *pattern);
typedef enum _cairo_ft_extra_flags {
CAIRO_FT_OPTIONS_HINT_METRICS = (1 << 0),
CAIRO_FT_OPTIONS_EMBOLDEN = (1 << 1)
} cairo_ft_extra_flags_t;
typedef struct _cairo_ft_options {
cairo_font_options_t base;
int load_flags; /* flags for FT_Load_Glyph */
cairo_ft_extra_flags_t extra_flags; /* other flags that affect results */
} cairo_ft_options_t;
struct _cairo_ft_font_face {
cairo_font_face_t base;
cairo_ft_unscaled_font_t *unscaled;
cairo_ft_options_t ft_options;
cairo_ft_font_face_t *next;
};
static const cairo_unscaled_font_backend_t cairo_ft_unscaled_font_backend;
/*
* We maintain a hash table to map file/id => #cairo_ft_unscaled_font_t.
* The hash table itself isn't limited in size. However, we limit the
* number of FT_Face objects we keep around; when we've exceeded that
* limit and need to create a new FT_Face, we dump the FT_Face from a
* random #cairo_ft_unscaled_font_t which has an unlocked FT_Face, (if
* there are any).
*/
typedef struct _cairo_ft_unscaled_font_map {
cairo_hash_table_t *hash_table;
FT_Library ft_library;
int num_open_faces;
} cairo_ft_unscaled_font_map_t;
static cairo_ft_unscaled_font_map_t *cairo_ft_unscaled_font_map = NULL;
static void
_font_map_release_face_lock_held (cairo_ft_unscaled_font_map_t *font_map,
cairo_ft_unscaled_font_t *unscaled)
{
if (unscaled->face) {
FT_Done_Face (unscaled->face);
unscaled->face = NULL;
unscaled->have_scale = FALSE;
font_map->num_open_faces--;
}
}
static void
_cairo_ft_unscaled_font_map_create (void)
{
cairo_ft_unscaled_font_map_t *font_map;
/* This function is only intended to be called from
* _cairo_ft_unscaled_font_map_lock. So we'll crash if we can
* detect some other call path. */
assert (cairo_ft_unscaled_font_map == NULL);
font_map = malloc (sizeof (cairo_ft_unscaled_font_map_t));
if (font_map == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
goto FAIL;
}
font_map->hash_table =
_cairo_hash_table_create (_cairo_ft_unscaled_font_keys_equal);
if (font_map->hash_table == NULL)
goto FAIL;
if (FT_Init_FreeType (&font_map->ft_library))
goto FAIL;
font_map->num_open_faces = 0;
cairo_ft_unscaled_font_map = font_map;
return;
FAIL:
if (font_map) {
if (font_map->hash_table)
_cairo_hash_table_destroy (font_map->hash_table);
free (font_map);
}
cairo_ft_unscaled_font_map = NULL;
}
static void
_cairo_ft_unscaled_font_map_destroy (void)
{
cairo_ft_unscaled_font_t *unscaled;
cairo_ft_unscaled_font_map_t *font_map;
CAIRO_MUTEX_LOCK (_cairo_ft_unscaled_font_map_mutex);
if (cairo_ft_unscaled_font_map) {
font_map = cairo_ft_unscaled_font_map;
/* This is rather inefficient, but destroying the hash table
* is something we only do during debugging, (during
* cairo_debug_reset_static_data), when efficiency is not
* relevant. */
while (1) {
unscaled = _cairo_hash_table_random_entry (font_map->hash_table,
NULL);
if (unscaled == NULL)
break;
_cairo_hash_table_remove (font_map->hash_table,
&unscaled->base.hash_entry);
_font_map_release_face_lock_held (font_map, unscaled);
_cairo_ft_unscaled_font_fini (unscaled);
free (unscaled);
}
assert (font_map->num_open_faces == 0);
FT_Done_FreeType (font_map->ft_library);
_cairo_hash_table_destroy (font_map->hash_table);
free (font_map);
cairo_ft_unscaled_font_map = NULL;
}
CAIRO_MUTEX_UNLOCK (_cairo_ft_unscaled_font_map_mutex);
}
static cairo_ft_unscaled_font_map_t *
_cairo_ft_unscaled_font_map_lock (void)
{
CAIRO_MUTEX_LOCK (_cairo_ft_unscaled_font_map_mutex);
if (cairo_ft_unscaled_font_map == NULL)
{
_cairo_ft_unscaled_font_map_create ();
if (cairo_ft_unscaled_font_map == NULL) {
CAIRO_MUTEX_UNLOCK (_cairo_ft_unscaled_font_map_mutex);
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
}
return cairo_ft_unscaled_font_map;
}
static void
_cairo_ft_unscaled_font_map_unlock (void)
{
CAIRO_MUTEX_UNLOCK (_cairo_ft_unscaled_font_map_mutex);
}
static void
_cairo_ft_unscaled_font_init_key (cairo_ft_unscaled_font_t *key,
char *filename,
int id)
{
unsigned long hash;
key->filename = filename;
key->id = id;
/* 1607 is just an arbitrary prime. */
hash = _cairo_hash_string (filename);
hash += ((unsigned long) id) * 1607;
key->base.hash_entry.hash = hash;
}
/**
* _cairo_ft_unscaled_font_init:
*
* Initialize a #cairo_ft_unscaled_font_t.
*
* There are two basic flavors of #cairo_ft_unscaled_font_t, one
* created from an FT_Face and the other created from a filename/id
* pair. These two flavors are identified as from_face and !from_face.
*
* To initialize a from_face font, pass filename==%NULL, id=0 and the
* desired face.
*
* To initialize a !from_face font, pass the filename/id as desired
* and face==%NULL.
*
* Note that the code handles these two flavors in very distinct
* ways. For example there is a hash_table mapping
* filename/id->#cairo_unscaled_font_t in the !from_face case, but no
* parallel in the from_face case, (where the calling code would have
* to do its own mapping to ensure similar sharing).
**/
static cairo_status_t
_cairo_ft_unscaled_font_init (cairo_ft_unscaled_font_t *unscaled,
const char *filename,
int id,
FT_Face face)
{
_cairo_unscaled_font_init (&unscaled->base,
&cairo_ft_unscaled_font_backend);
if (face) {
unscaled->from_face = TRUE;
unscaled->face = face;
unscaled->filename = NULL;
unscaled->id = 0;
} else {
char *filename_copy;
unscaled->from_face = FALSE;
unscaled->face = NULL;
filename_copy = strdup (filename);
if (filename_copy == NULL)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
_cairo_ft_unscaled_font_init_key (unscaled, filename_copy, id);
}
unscaled->have_scale = FALSE;
CAIRO_MUTEX_INIT (unscaled->mutex);
unscaled->lock_count = 0;
unscaled->faces = NULL;
return CAIRO_STATUS_SUCCESS;
}
cairo_bool_t
_cairo_unscaled_font_is_ft (cairo_unscaled_font_t *unscaled_font)
{
return unscaled_font->backend == &cairo_ft_unscaled_font_backend;
}
/**
* _cairo_ft_unscaled_font_fini:
*
* Free all data associated with a #cairo_ft_unscaled_font_t.
*
* CAUTION: The unscaled->face field must be %NULL before calling this
* function. This is because the #cairo_ft_unscaled_font_t_map keeps a
* count of these faces (font_map->num_open_faces) so it maintains the
* unscaled->face field while it has its lock held. See
* _font_map_release_face_lock_held().
**/
static void
_cairo_ft_unscaled_font_fini (cairo_ft_unscaled_font_t *unscaled)
{
assert (unscaled->face == NULL);
if (unscaled->filename) {
free (unscaled->filename);
unscaled->filename = NULL;
}
CAIRO_MUTEX_FINI (unscaled->mutex);
}
static int
_cairo_ft_unscaled_font_keys_equal (const void *key_a,
const void *key_b)
{
const cairo_ft_unscaled_font_t *unscaled_a = key_a;
const cairo_ft_unscaled_font_t *unscaled_b = key_b;
return (strcmp (unscaled_a->filename, unscaled_b->filename) == 0 &&
unscaled_a->id == unscaled_b->id);
}
/* Finds or creates a #cairo_ft_unscaled_font_t for the filename/id from
* pattern. Returns a new reference to the unscaled font.
*/
static cairo_ft_unscaled_font_t *
_cairo_ft_unscaled_font_create_for_pattern (FcPattern *pattern)
{
cairo_ft_unscaled_font_t key, *unscaled;
cairo_ft_unscaled_font_map_t *font_map;
cairo_status_t status;
FcChar8 *fc_filename;
char *filename;
int id;
if (FcPatternGetString (pattern, FC_FILE, 0, &fc_filename) != FcResultMatch)
goto UNWIND;
filename = (char *) fc_filename;
if (FcPatternGetInteger (pattern, FC_INDEX, 0, &id) != FcResultMatch)
goto UNWIND;
font_map = _cairo_ft_unscaled_font_map_lock ();
if (font_map == NULL)
goto UNWIND;
_cairo_ft_unscaled_font_init_key (&key, filename, id);
/* Return existing unscaled font if it exists in the hash table. */
if (_cairo_hash_table_lookup (font_map->hash_table, &key.base.hash_entry,
(cairo_hash_entry_t **) &unscaled))
{
_cairo_unscaled_font_reference (&unscaled->base);
_cairo_ft_unscaled_font_map_unlock ();
return unscaled;
}
/* Otherwise create it and insert into hash table. */
unscaled = malloc (sizeof (cairo_ft_unscaled_font_t));
if (unscaled == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
goto UNWIND_FONT_MAP_LOCK;
}
status = _cairo_ft_unscaled_font_init (unscaled, filename, id, NULL);
if (status)
goto UNWIND_UNSCALED_MALLOC;
status = _cairo_hash_table_insert (font_map->hash_table,
&unscaled->base.hash_entry);
if (status)
goto UNWIND_UNSCALED_FONT_INIT;
_cairo_ft_unscaled_font_map_unlock ();
return unscaled;
UNWIND_UNSCALED_FONT_INIT:
_cairo_ft_unscaled_font_fini (unscaled);
UNWIND_UNSCALED_MALLOC:
free (unscaled);
UNWIND_FONT_MAP_LOCK:
_cairo_ft_unscaled_font_map_unlock ();
UNWIND:
return NULL;
}
static cairo_ft_unscaled_font_t *
_cairo_ft_unscaled_font_create_from_face (FT_Face face)
{
cairo_status_t status;
cairo_ft_unscaled_font_t *unscaled;
unscaled = malloc (sizeof (cairo_ft_unscaled_font_t));
if (unscaled == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
status = _cairo_ft_unscaled_font_init (unscaled, NULL, 0, face);
if (status) {
free (unscaled);
return NULL;
}
return unscaled;
}
static void
_cairo_ft_unscaled_font_destroy (void *abstract_font)
{
cairo_ft_unscaled_font_t *unscaled = abstract_font;
if (unscaled == NULL)
return;
if (unscaled->from_face) {
/* See comments in _ft_font_face_destroy about the "zombie" state
* for a _ft_font_face.
*/
if (unscaled->faces && !unscaled->faces->unscaled)
cairo_font_face_destroy (&unscaled->faces->base);
unscaled->face = NULL;
} else {
cairo_ft_unscaled_font_map_t *font_map;
font_map = _cairo_ft_unscaled_font_map_lock ();
/* All created objects must have been mapped in the font map. */
assert (font_map != NULL);
_cairo_hash_table_remove (font_map->hash_table,
&unscaled->base.hash_entry);
_font_map_release_face_lock_held (font_map, unscaled);
_cairo_ft_unscaled_font_map_unlock ();
}
_cairo_ft_unscaled_font_fini (unscaled);
}
static cairo_bool_t
_has_unlocked_face (void *entry)
{
cairo_ft_unscaled_font_t *unscaled = entry;
return (unscaled->lock_count == 0 && unscaled->face);
}
/* Ensures that an unscaled font has a face object. If we exceed
* MAX_OPEN_FACES, try to close some.
*
* This differs from _cairo_ft_scaled_font_lock_face in that it doesn't
* set the scale on the face, but just returns it at the last scale.
*/
FT_Face
_cairo_ft_unscaled_font_lock_face (cairo_ft_unscaled_font_t *unscaled)
{
cairo_ft_unscaled_font_map_t *font_map;
FT_Face face = NULL;
CAIRO_MUTEX_LOCK (unscaled->mutex);
unscaled->lock_count++;
if (unscaled->face)
return unscaled->face;
/* If this unscaled font was created from an FT_Face then we just
* returned it above. */
assert (!unscaled->from_face);
font_map = _cairo_ft_unscaled_font_map_lock ();
{
assert (font_map != NULL);
while (font_map->num_open_faces >= MAX_OPEN_FACES)
{
cairo_ft_unscaled_font_t *entry;
entry = _cairo_hash_table_random_entry (font_map->hash_table,
_has_unlocked_face);
if (entry == NULL)
break;
_font_map_release_face_lock_held (font_map, entry);
}
}
_cairo_ft_unscaled_font_map_unlock ();
if (FT_New_Face (font_map->ft_library,
unscaled->filename,
unscaled->id,
&face) != FT_Err_Ok)
{
unscaled->lock_count--;
CAIRO_MUTEX_UNLOCK (unscaled->mutex);
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
unscaled->face = face;
font_map->num_open_faces++;
return face;
}
slim_hidden_def (cairo_ft_scaled_font_lock_face);
/* Unlock unscaled font locked with _cairo_ft_unscaled_font_lock_face
*/
void
_cairo_ft_unscaled_font_unlock_face (cairo_ft_unscaled_font_t *unscaled)
{
assert (unscaled->lock_count > 0);
unscaled->lock_count--;
CAIRO_MUTEX_UNLOCK (unscaled->mutex);
}
slim_hidden_def (cairo_ft_scaled_font_unlock_face);
static cairo_status_t
_compute_transform (cairo_ft_font_transform_t *sf,
cairo_matrix_t *scale)
{
cairo_status_t status;
cairo_matrix_t normalized = *scale;
/* The font matrix has x and y "scale" components which we extract and
* use as character scale values. These influence the way freetype
* chooses hints, as well as selecting different bitmaps in
* hand-rendered fonts. We also copy the normalized matrix to
* freetype's transformation.
*/
status = _cairo_matrix_compute_scale_factors (&normalized,
&sf->x_scale, &sf->y_scale,
/* XXX */ 1);
if (status)
return status;
if (sf->x_scale != 0 && sf->y_scale != 0) {
cairo_matrix_scale (&normalized, 1.0 / sf->x_scale, 1.0 / sf->y_scale);
_cairo_matrix_get_affine (&normalized,
&sf->shape[0][0], &sf->shape[0][1],
&sf->shape[1][0], &sf->shape[1][1],
NULL, NULL);
} else {
sf->shape[0][0] = sf->shape[1][1] = 1.0;
sf->shape[0][1] = sf->shape[1][0] = 0.0;
}
return CAIRO_STATUS_SUCCESS;
}
/* Temporarily scales an unscaled font to the give scale. We catch
* scaling to the same size, since changing a FT_Face is expensive.
*/
static cairo_status_t
_cairo_ft_unscaled_font_set_scale (cairo_ft_unscaled_font_t *unscaled,
cairo_matrix_t *scale)
{
cairo_status_t status;
cairo_ft_font_transform_t sf;
FT_Matrix mat;
FT_Error error;
assert (unscaled->face != NULL);
if (unscaled->have_scale &&
scale->xx == unscaled->current_scale.xx &&
scale->yx == unscaled->current_scale.yx &&
scale->xy == unscaled->current_scale.xy &&
scale->yy == unscaled->current_scale.yy)
return CAIRO_STATUS_SUCCESS;
unscaled->have_scale = TRUE;
unscaled->current_scale = *scale;
status = _compute_transform (&sf, scale);
if (status)
return status;
unscaled->x_scale = sf.x_scale;
unscaled->y_scale = sf.y_scale;
mat.xx = DOUBLE_TO_16_16(sf.shape[0][0]);
mat.yx = - DOUBLE_TO_16_16(sf.shape[0][1]);
mat.xy = - DOUBLE_TO_16_16(sf.shape[1][0]);
mat.yy = DOUBLE_TO_16_16(sf.shape[1][1]);
unscaled->have_shape = (mat.xx != 0x10000 ||
mat.yx != 0x00000 ||
mat.xy != 0x00000 ||
mat.yy != 0x10000);
unscaled->Current_Shape = mat;
cairo_matrix_init (&unscaled->current_shape,
sf.shape[0][0], sf.shape[0][1],
sf.shape[1][0], sf.shape[1][1],
0.0, 0.0);
FT_Set_Transform(unscaled->face, &mat, NULL);
if ((unscaled->face->face_flags & FT_FACE_FLAG_SCALABLE) != 0) {
error = FT_Set_Char_Size (unscaled->face,
sf.x_scale * 64.0,
sf.y_scale * 64.0,
0, 0);
if (error)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
} else {
double min_distance = DBL_MAX;
int i;
int best_i = 0;
for (i = 0; i < unscaled->face->num_fixed_sizes; i++) {
#if HAVE_FT_BITMAP_SIZE_Y_PPEM
double size = unscaled->face->available_sizes[i].y_ppem / 64.;
#else
double size = unscaled->face->available_sizes[i].height;
#endif
double distance = fabs (size - sf.y_scale);
if (distance <= min_distance) {
min_distance = distance;
best_i = i;
}
}
#if HAVE_FT_BITMAP_SIZE_Y_PPEM
error = FT_Set_Char_Size (unscaled->face,
unscaled->face->available_sizes[best_i].x_ppem,
unscaled->face->available_sizes[best_i].y_ppem,
0, 0);
if (error)
#endif
error = FT_Set_Pixel_Sizes (unscaled->face,
unscaled->face->available_sizes[best_i].width,
unscaled->face->available_sizes[best_i].height);
if (error)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
return CAIRO_STATUS_SUCCESS;
}
/* Empirically-derived subpixel filtering values thanks to Keith
* Packard and libXft. */
static const int filters[3][3] = {
/* red */
#if 0
{ 65538*4/7,65538*2/7,65538*1/7 },
/* green */
{ 65536*1/4, 65536*2/4, 65537*1/4 },
/* blue */
{ 65538*1/7,65538*2/7,65538*4/7 },
#endif
{ 65538*9/13,65538*3/13,65538*1/13 },
/* green */
{ 65538*1/6, 65538*4/6, 65538*1/6 },
/* blue */
{ 65538*1/13,65538*3/13,65538*9/13 },
};
/* Fills in val->image with an image surface created from @bitmap
*/
static cairo_status_t
_get_bitmap_surface (FT_Bitmap *bitmap,
cairo_bool_t own_buffer,
cairo_font_options_t *font_options,
cairo_image_surface_t **surface)
{
int width, height, stride;
unsigned char *data;
int format = CAIRO_FORMAT_A8;
cairo_bool_t subpixel = FALSE;
width = bitmap->width;
height = bitmap->rows;
if (width == 0 || height == 0) {
*surface = (cairo_image_surface_t *)
cairo_image_surface_create_for_data (NULL, format, 0, 0, 0);
return (*surface)->base.status;
}
switch (bitmap->pixel_mode) {
case FT_PIXEL_MODE_MONO:
stride = (((width + 31) & ~31) >> 3);
if (own_buffer) {
data = bitmap->buffer;
assert (stride == bitmap->pitch);
} else {
data = _cairo_malloc_ab (height, stride);
if (!data)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (stride == bitmap->pitch) {
memcpy (data, bitmap->buffer, stride * height);
} else {
int i;
unsigned char *source, *dest;
source = bitmap->buffer;
dest = data;
for (i = height; i; i--) {
memcpy (dest, source, bitmap->pitch);
memset (dest + bitmap->pitch, '\0', stride - bitmap->pitch);
source += bitmap->pitch;
dest += stride;
}
}
}
#ifndef WORDS_BIGENDIAN
{
unsigned char *d = data;
int count = stride * height;
while (count--) {
*d = CAIRO_BITSWAP8 (*d);
d++;
}
}
#endif
format = CAIRO_FORMAT_A1;
break;
case FT_PIXEL_MODE_LCD:
case FT_PIXEL_MODE_LCD_V:
case FT_PIXEL_MODE_GRAY:
switch (font_options->antialias) {
case CAIRO_ANTIALIAS_DEFAULT:
case CAIRO_ANTIALIAS_GRAY:
case CAIRO_ANTIALIAS_NONE:
default:
stride = bitmap->pitch;
if (own_buffer) {
data = bitmap->buffer;
} else {
data = _cairo_malloc_ab (height, stride);
if (!data)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
memcpy (data, bitmap->buffer, stride * height);
}
format = CAIRO_FORMAT_A8;
break;
case CAIRO_ANTIALIAS_SUBPIXEL: {
int x, y;
unsigned char *in_line, *out_line, *in;
unsigned int *out;
unsigned int red, green, blue;
int rf, gf, bf;
int s;
int o, os;
unsigned char *data_rgba;
unsigned int width_rgba, stride_rgba;
int vmul = 1;
int hmul = 1;
switch (font_options->subpixel_order) {
case CAIRO_SUBPIXEL_ORDER_DEFAULT:
case CAIRO_SUBPIXEL_ORDER_RGB:
case CAIRO_SUBPIXEL_ORDER_BGR:
default:
width /= 3;
hmul = 3;
break;
case CAIRO_SUBPIXEL_ORDER_VRGB:
case CAIRO_SUBPIXEL_ORDER_VBGR:
vmul = 3;
height /= 3;
break;
}
/*
* Filter the glyph to soften the color fringes
*/
width_rgba = width;
stride = bitmap->pitch;
stride_rgba = (width_rgba * 4 + 3) & ~3;
data_rgba = calloc (stride_rgba, height);
if (data_rgba == NULL) {
if (own_buffer)
free (bitmap->buffer);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
os = 1;
switch (font_options->subpixel_order) {
case CAIRO_SUBPIXEL_ORDER_VRGB:
os = stride;
case CAIRO_SUBPIXEL_ORDER_DEFAULT:
case CAIRO_SUBPIXEL_ORDER_RGB:
default:
rf = 0;
gf = 1;
bf = 2;
break;
case CAIRO_SUBPIXEL_ORDER_VBGR:
os = stride;
case CAIRO_SUBPIXEL_ORDER_BGR:
bf = 0;
gf = 1;
rf = 2;
break;
}
in_line = bitmap->buffer;
out_line = data_rgba;
for (y = 0; y < height; y++)
{
in = in_line;
out = (unsigned int *) out_line;
in_line += stride * vmul;
out_line += stride_rgba;
for (x = 0; x < width * hmul; x += hmul)
{
red = green = blue = 0;
o = 0;
for (s = 0; s < 3; s++)
{
red += filters[rf][s]*in[x+o];
green += filters[gf][s]*in[x+o];
blue += filters[bf][s]*in[x+o];
o += os;
}
red = red / 65536;
green = green / 65536;
blue = blue / 65536;
*out++ = (green << 24) | (red << 16) | (green << 8) | blue;
}
}
/* Images here are stored in native format. The
* backend must convert to its own format as needed
*/
if (own_buffer)
free (bitmap->buffer);
data = data_rgba;
stride = stride_rgba;
format = CAIRO_FORMAT_ARGB32;
subpixel = TRUE;
break;
}
}
break;
case FT_PIXEL_MODE_GRAY2:
case FT_PIXEL_MODE_GRAY4:
/* These could be triggered by very rare types of TrueType fonts */
default:
if (own_buffer)
free (bitmap->buffer);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
*surface = (cairo_image_surface_t *)
cairo_image_surface_create_for_data (data,
format,
width, height, stride);
if ((*surface)->base.status) {
free (data);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
if (subpixel)
pixman_image_set_component_alpha ((*surface)->pixman_image, TRUE);
_cairo_image_surface_assume_ownership_of_data ((*surface));
return CAIRO_STATUS_SUCCESS;
}
/* Converts an outline FT_GlyphSlot into an image
*
* This could go through _render_glyph_bitmap as well, letting
* FreeType convert the outline to a bitmap, but doing it ourselves
* has two minor advantages: first, we save a copy of the bitmap
* buffer: we can directly use the buffer that FreeType renders
* into.
*
* Second, it may help when we add support for subpixel
* rendering: the Xft code does it this way. (Keith thinks that
* it may also be possible to get the subpixel rendering with
* FT_Render_Glyph: something worth looking into in more detail
* when we add subpixel support. If so, we may want to eliminate
* this version of the code path entirely.
*/
static cairo_status_t
_render_glyph_outline (FT_Face face,
cairo_font_options_t *font_options,
cairo_image_surface_t **surface)
{
FT_GlyphSlot glyphslot = face->glyph;
FT_Outline *outline = &glyphslot->outline;
FT_Bitmap bitmap;
FT_BBox cbox;
FT_Matrix matrix;
int hmul = 1;
int vmul = 1;
unsigned int width, height, stride;
cairo_bool_t subpixel = FALSE;
cairo_status_t status;
FT_Outline_Get_CBox (outline, &cbox);
cbox.xMin &= -64;
cbox.yMin &= -64;
cbox.xMax = (cbox.xMax + 63) & -64;
cbox.yMax = (cbox.yMax + 63) & -64;
width = (unsigned int) ((cbox.xMax - cbox.xMin) >> 6);
height = (unsigned int) ((cbox.yMax - cbox.yMin) >> 6);
stride = (width * hmul + 3) & ~3;
if (width * height == 0) {
cairo_format_t format;
/* Looks like fb handles zero-sized images just fine */
switch (font_options->antialias) {
case CAIRO_ANTIALIAS_NONE:
format = CAIRO_FORMAT_A1;
break;
case CAIRO_ANTIALIAS_SUBPIXEL:
format= CAIRO_FORMAT_ARGB32;
break;
case CAIRO_ANTIALIAS_DEFAULT:
case CAIRO_ANTIALIAS_GRAY:
default:
format = CAIRO_FORMAT_A8;
break;
}
(*surface) = (cairo_image_surface_t *)
cairo_image_surface_create_for_data (NULL, format, 0, 0, 0);
if ((*surface)->base.status)
return (*surface)->base.status;
} else {
matrix.xx = matrix.yy = 0x10000L;
matrix.xy = matrix.yx = 0;
switch (font_options->antialias) {
case CAIRO_ANTIALIAS_NONE:
bitmap.pixel_mode = FT_PIXEL_MODE_MONO;
bitmap.num_grays = 1;
stride = ((width + 31) & -32) >> 3;
break;
case CAIRO_ANTIALIAS_DEFAULT:
case CAIRO_ANTIALIAS_GRAY:
bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
bitmap.num_grays = 256;
stride = (width + 3) & -4;
break;
case CAIRO_ANTIALIAS_SUBPIXEL:
switch (font_options->subpixel_order) {
case CAIRO_SUBPIXEL_ORDER_RGB:
case CAIRO_SUBPIXEL_ORDER_BGR:
case CAIRO_SUBPIXEL_ORDER_DEFAULT:
default:
matrix.xx *= 3;
hmul = 3;
subpixel = TRUE;
break;
case CAIRO_SUBPIXEL_ORDER_VRGB:
case CAIRO_SUBPIXEL_ORDER_VBGR:
matrix.yy *= 3;
vmul = 3;
subpixel = TRUE;
break;
}
FT_Outline_Transform (outline, &matrix);
bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
bitmap.num_grays = 256;
stride = (width * hmul + 3) & -4;
}
bitmap.pitch = stride;
bitmap.width = width * hmul;
bitmap.rows = height * vmul;
bitmap.buffer = calloc (stride, bitmap.rows);
if (bitmap.buffer == NULL) {
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
FT_Outline_Translate (outline, -cbox.xMin*hmul, -cbox.yMin*vmul);
if (FT_Outline_Get_Bitmap (glyphslot->library, outline, &bitmap) != 0) {
free (bitmap.buffer);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
status = _get_bitmap_surface (&bitmap, TRUE, font_options, surface);
if (status)
return status;
}
/*
* Note: the font's coordinate system is upside down from ours, so the
* Y coordinate of the control box needs to be negated. Moreover, device
* offsets are position of glyph origin relative to top left while xMin
* and yMax are offsets of top left relative to origin. Another negation.
*/
cairo_surface_set_device_offset (&(*surface)->base,
floor (-(double) cbox.xMin / 64.0),
floor (+(double) cbox.yMax / 64.0));
return CAIRO_STATUS_SUCCESS;
}
/* Converts a bitmap (or other) FT_GlyphSlot into an image */
static cairo_status_t
_render_glyph_bitmap (FT_Face face,
cairo_font_options_t *font_options,
cairo_image_surface_t **surface)
{
FT_GlyphSlot glyphslot = face->glyph;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
FT_Error error;
/* According to the FreeType docs, glyphslot->format could be
* something other than FT_GLYPH_FORMAT_OUTLINE or
* FT_GLYPH_FORMAT_BITMAP. Calling FT_Render_Glyph gives FreeType
* the opportunity to convert such to
* bitmap. FT_GLYPH_FORMAT_COMPOSITE will not be encountered since
* we avoid the FT_LOAD_NO_RECURSE flag.
*/
error = FT_Render_Glyph (glyphslot, FT_RENDER_MODE_NORMAL);
/* XXX ignoring all other errors for now. They are not fatal, typically
* just a glyph-not-found. */
if (error == FT_Err_Out_Of_Memory)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
status = _get_bitmap_surface (&glyphslot->bitmap, FALSE, font_options, surface);
if (status)
return status;
/*
* Note: the font's coordinate system is upside down from ours, so the
* Y coordinate of the control box needs to be negated. Moreover, device
* offsets are position of glyph origin relative to top left while
* bitmap_left and bitmap_top are offsets of top left relative to origin.
* Another negation.
*/
cairo_surface_set_device_offset (&(*surface)->base,
-glyphslot->bitmap_left,
+glyphslot->bitmap_top);
return status;
}
static cairo_status_t
_transform_glyph_bitmap (cairo_matrix_t * shape,
cairo_image_surface_t ** surface)
{
cairo_matrix_t original_to_transformed;
cairo_matrix_t transformed_to_original;
cairo_image_surface_t *old_image;
cairo_surface_t *image;
double x[4], y[4];
double origin_x, origin_y;
int orig_width, orig_height;
int i;
int x_min, y_min, x_max, y_max;
int width, height;
cairo_status_t status;
cairo_surface_pattern_t pattern;
/* We want to compute a transform that takes the origin
* (device_x_offset, device_y_offset) to 0,0, then applies
* the "shape" portion of the font transform
*/
original_to_transformed = *shape;
cairo_surface_get_device_offset (&(*surface)->base, &origin_x, &origin_y);
orig_width = cairo_image_surface_get_width (&(*surface)->base);
orig_height = cairo_image_surface_get_height (&(*surface)->base);
cairo_matrix_translate (&original_to_transformed,
-origin_x, -origin_y);
/* Find the bounding box of the original bitmap under that
* transform
*/
x[0] = 0; y[0] = 0;
x[1] = orig_width; y[1] = 0;
x[2] = orig_width; y[2] = orig_height;
x[3] = 0; y[3] = orig_height;
for (i = 0; i < 4; i++)
cairo_matrix_transform_point (&original_to_transformed,
&x[i], &y[i]);
x_min = floor (x[0]); y_min = floor (y[0]);
x_max = ceil (x[0]); y_max = ceil (y[0]);
for (i = 1; i < 4; i++) {
if (x[i] < x_min)
x_min = floor (x[i]);
else if (x[i] > x_max)
x_max = ceil (x[i]);
if (y[i] < y_min)
y_min = floor (y[i]);
else if (y[i] > y_max)
y_max = ceil (y[i]);
}
/* Adjust the transform so that the bounding box starts at 0,0 ...
* this gives our final transform from original bitmap to transformed
* bitmap.
*/
original_to_transformed.x0 -= x_min;
original_to_transformed.y0 -= y_min;
/* Create the transformed bitmap
*/
width = x_max - x_min;
height = y_max - y_min;
transformed_to_original = original_to_transformed;
status = cairo_matrix_invert (&transformed_to_original);
if (status)
return status;
/* We need to pad out the width to 32-bit intervals for cairo-xlib-surface.c */
width = (width + 3) & ~3;
image = cairo_image_surface_create (CAIRO_FORMAT_A8, width, height);
if (image->status)
return image->status;
/* Initialize it to empty
*/
status = _cairo_surface_fill_rectangle (image, CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
0, 0,
width, height);
if (status) {
cairo_surface_destroy (image);
return status;
}
/* Draw the original bitmap transformed into the new bitmap
*/
_cairo_pattern_init_for_surface (&pattern, &(*surface)->base);
cairo_pattern_set_matrix (&pattern.base, &transformed_to_original);
status = _cairo_surface_composite (CAIRO_OPERATOR_OVER,
&pattern.base, NULL, image,
0, 0, 0, 0, 0, 0,
width,
height);
_cairo_pattern_fini (&pattern.base);
if (status) {
cairo_surface_destroy (image);
return status;
}
/* Now update the cache entry for the new bitmap, recomputing
* the origin based on the final transform.
*/
cairo_matrix_transform_point (&original_to_transformed,
&origin_x, &origin_y);
old_image = (*surface);
(*surface) = (cairo_image_surface_t *)image;
cairo_surface_destroy (&old_image->base);
cairo_surface_set_device_offset (&(*surface)->base,
_cairo_lround (origin_x),
_cairo_lround (origin_y));
return status;
}
static const cairo_unscaled_font_backend_t cairo_ft_unscaled_font_backend = {
_cairo_ft_unscaled_font_destroy,
#if 0
_cairo_ft_unscaled_font_create_glyph
#endif
};
/* #cairo_ft_scaled_font_t */
typedef struct _cairo_ft_scaled_font {
cairo_scaled_font_t base;
cairo_ft_unscaled_font_t *unscaled;
cairo_ft_options_t ft_options;
} cairo_ft_scaled_font_t;
const cairo_scaled_font_backend_t cairo_ft_scaled_font_backend;
/* The load flags passed to FT_Load_Glyph control aspects like hinting and
* antialiasing. Here we compute them from the fields of a FcPattern.
*/
static void
_get_pattern_ft_options (FcPattern *pattern, cairo_ft_options_t *ret)
{
FcBool antialias, vertical_layout, hinting, autohint, bitmap, embolden;
cairo_ft_options_t ft_options;
int rgba;
#ifdef FC_HINT_STYLE
int hintstyle;
#endif
_cairo_font_options_init_default (&ft_options.base);
ft_options.load_flags = FT_LOAD_DEFAULT;
ft_options.extra_flags = 0;
#ifndef FC_EMBEDDED_BITMAP
#define FC_EMBEDDED_BITMAP "embeddedbitmap"
#endif
/* Check whether to force use of embedded bitmaps */
if (FcPatternGetBool (pattern,
FC_EMBEDDED_BITMAP, 0, &bitmap) != FcResultMatch)
bitmap = FcFalse;
/* disable antialiasing if requested */
if (FcPatternGetBool (pattern,
FC_ANTIALIAS, 0, &antialias) != FcResultMatch)
antialias = FcTrue;
if (antialias) {
cairo_subpixel_order_t subpixel_order;
/* disable hinting if requested */
if (FcPatternGetBool (pattern,
FC_HINTING, 0, &hinting) != FcResultMatch)
hinting = FcTrue;
if (FcPatternGetInteger (pattern,
FC_RGBA, 0, &rgba) != FcResultMatch)
rgba = FC_RGBA_UNKNOWN;
switch (rgba) {
case FC_RGBA_RGB:
subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB;
break;
case FC_RGBA_BGR:
subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR;
break;
case FC_RGBA_VRGB:
subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB;
break;
case FC_RGBA_VBGR:
subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR;
break;
case FC_RGBA_UNKNOWN:
case FC_RGBA_NONE:
default:
subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT;
break;
}
if (subpixel_order != CAIRO_SUBPIXEL_ORDER_DEFAULT) {
ft_options.base.subpixel_order = subpixel_order;
ft_options.base.antialias = CAIRO_ANTIALIAS_SUBPIXEL;
}
#ifdef FC_HINT_STYLE
if (FcPatternGetInteger (pattern,
FC_HINT_STYLE, 0, &hintstyle) != FcResultMatch)
hintstyle = FC_HINT_FULL;
if (!hinting)
hintstyle = FC_HINT_NONE;
switch (hintstyle) {
case FC_HINT_NONE:
ft_options.base.hint_style = CAIRO_HINT_STYLE_NONE;
break;
case FC_HINT_SLIGHT:
ft_options.base.hint_style = CAIRO_HINT_STYLE_SLIGHT;
break;
case FC_HINT_MEDIUM:
default:
ft_options.base.hint_style = CAIRO_HINT_STYLE_MEDIUM;
break;
case FC_HINT_FULL:
ft_options.base.hint_style = CAIRO_HINT_STYLE_FULL;
break;
}
#else /* !FC_HINT_STYLE */
if (!hinting) {
ft_options.base.hint_style = CAIRO_HINT_STYLE_NONE;
}
#endif /* FC_HINT_STYLE */
/* Force embedded bitmaps off if no hinting requested */
if (ft_options.base.hint_style == CAIRO_HINT_STYLE_NONE)
bitmap = FcFalse;
if (!bitmap)
ft_options.load_flags |= FT_LOAD_NO_BITMAP;
} else {
ft_options.base.antialias = CAIRO_ANTIALIAS_NONE;
}
/* force autohinting if requested */
if (FcPatternGetBool (pattern,
FC_AUTOHINT, 0, &autohint) != FcResultMatch)
autohint = FcFalse;
if (autohint)
ft_options.load_flags |= FT_LOAD_FORCE_AUTOHINT;
if (FcPatternGetBool (pattern,
FC_VERTICAL_LAYOUT, 0, &vertical_layout) != FcResultMatch)
vertical_layout = FcFalse;
if (vertical_layout)
ft_options.load_flags |= FT_LOAD_VERTICAL_LAYOUT;
#ifndef FC_EMBOLDEN
#define FC_EMBOLDEN "embolden"
#endif
if (FcPatternGetBool (pattern,
FC_EMBOLDEN, 0, &embolden) != FcResultMatch)
embolden = FcFalse;
if (embolden)
ft_options.extra_flags |= CAIRO_FT_OPTIONS_EMBOLDEN;
*ret = ft_options;
}
static void
_cairo_ft_options_merge (cairo_ft_options_t *options,
cairo_ft_options_t *other)
{
int load_flags = other->load_flags;
int load_target = FT_LOAD_TARGET_NORMAL;
/* clear load target mode */
load_flags &= ~(FT_LOAD_TARGET_(FT_LOAD_TARGET_MODE(other->load_flags)));
if (load_flags & FT_LOAD_NO_HINTING)
other->base.hint_style = CAIRO_HINT_STYLE_NONE;
if (other->base.antialias == CAIRO_ANTIALIAS_NONE ||
options->base.antialias == CAIRO_ANTIALIAS_NONE) {
options->base.antialias = CAIRO_ANTIALIAS_NONE;
options->base.subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT;
}
if (other->base.antialias == CAIRO_ANTIALIAS_SUBPIXEL &&
(options->base.antialias == CAIRO_ANTIALIAS_DEFAULT ||
options->base.antialias == CAIRO_ANTIALIAS_GRAY)) {
options->base.antialias = CAIRO_ANTIALIAS_SUBPIXEL;
options->base.subpixel_order = other->base.subpixel_order;
}
if (options->base.hint_style == CAIRO_HINT_STYLE_DEFAULT)
options->base.hint_style = other->base.hint_style;
if (other->base.hint_style == CAIRO_HINT_STYLE_NONE)
options->base.hint_style = CAIRO_HINT_STYLE_NONE;
if (options->base.antialias == CAIRO_ANTIALIAS_NONE) {
if (options->base.hint_style == CAIRO_HINT_STYLE_NONE)
load_flags |= FT_LOAD_NO_HINTING;
else
load_target = FT_LOAD_TARGET_MONO;
load_flags |= FT_LOAD_MONOCHROME;
} else {
switch (options->base.hint_style) {
case CAIRO_HINT_STYLE_NONE:
load_flags |= FT_LOAD_NO_HINTING;
break;
case CAIRO_HINT_STYLE_SLIGHT:
load_target = FT_LOAD_TARGET_LIGHT;
break;
case CAIRO_HINT_STYLE_MEDIUM:
break;
case CAIRO_HINT_STYLE_FULL:
case CAIRO_HINT_STYLE_DEFAULT:
if (options->base.antialias == CAIRO_ANTIALIAS_SUBPIXEL) {
switch (options->base.subpixel_order) {
case CAIRO_SUBPIXEL_ORDER_DEFAULT:
case CAIRO_SUBPIXEL_ORDER_RGB:
case CAIRO_SUBPIXEL_ORDER_BGR:
load_target |= FT_LOAD_TARGET_LCD;
break;
case CAIRO_SUBPIXEL_ORDER_VRGB:
case CAIRO_SUBPIXEL_ORDER_VBGR:
load_target |= FT_LOAD_TARGET_LCD_V;
break;
}
}
break;
}
}
options->load_flags = load_flags | load_target;
options->extra_flags = other->extra_flags;
if (options->base.hint_metrics != CAIRO_HINT_METRICS_OFF)
options->extra_flags |= CAIRO_FT_OPTIONS_HINT_METRICS;
}
static cairo_status_t
_cairo_ft_scaled_font_create (cairo_ft_unscaled_font_t *unscaled,
cairo_font_face_t *font_face,
const cairo_matrix_t *font_matrix,
const cairo_matrix_t *ctm,
const cairo_font_options_t *options,
cairo_ft_options_t ft_options,
cairo_scaled_font_t **font_out)
{
cairo_ft_scaled_font_t *scaled_font;
FT_Face face;
FT_Size_Metrics *metrics;
cairo_font_extents_t fs_metrics;
cairo_status_t status;
face = _cairo_ft_unscaled_font_lock_face (unscaled);
if (!face)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
scaled_font = malloc (sizeof(cairo_ft_scaled_font_t));
if (scaled_font == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FAIL;
}
_cairo_unscaled_font_reference (&unscaled->base);
scaled_font->unscaled = unscaled;
_cairo_font_options_init_copy (&scaled_font->ft_options.base, options);
_cairo_ft_options_merge (&scaled_font->ft_options, &ft_options);
status = _cairo_scaled_font_init (&scaled_font->base,
font_face,
font_matrix, ctm, options,
&cairo_ft_scaled_font_backend);
if (status) {
_cairo_unscaled_font_destroy (&unscaled->base);
free (scaled_font);
goto FAIL;
}
status = _cairo_ft_unscaled_font_set_scale (unscaled,
&scaled_font->base.scale);
if (status) {
_cairo_unscaled_font_destroy (&unscaled->base);
free (scaled_font);
goto FAIL;
}
metrics = &face->size->metrics;
/*
* Get to unscaled metrics so that the upper level can get back to
* user space
*
* Also use this path for bitmap-only fonts. The other branch uses
* face members that are only relevant for scalable fonts. This is
* detected by simply checking for units_per_EM==0.
*/
if (scaled_font->base.options.hint_metrics != CAIRO_HINT_METRICS_OFF ||
face->units_per_EM == 0) {
double x_factor, y_factor;
if (unscaled->x_scale == 0)
x_factor = 0;
else
x_factor = 1 / unscaled->x_scale;
if (unscaled->y_scale == 0)
y_factor = 0;
else
y_factor = 1 / unscaled->y_scale;
fs_metrics.ascent = DOUBLE_FROM_26_6(metrics->ascender) * y_factor;
fs_metrics.descent = DOUBLE_FROM_26_6(- metrics->descender) * y_factor;
fs_metrics.height = DOUBLE_FROM_26_6(metrics->height) * y_factor;
if (!_cairo_ft_scaled_font_is_vertical (&scaled_font->base)) {
fs_metrics.max_x_advance = DOUBLE_FROM_26_6(metrics->max_advance) * x_factor;
fs_metrics.max_y_advance = 0;
} else {
fs_metrics.max_x_advance = 0;
fs_metrics.max_y_advance = DOUBLE_FROM_26_6(metrics->max_advance) * y_factor;
}
} else {
double scale = face->units_per_EM;
fs_metrics.ascent = face->ascender / scale;
fs_metrics.descent = - face->descender / scale;
fs_metrics.height = face->height / scale;
if (!_cairo_ft_scaled_font_is_vertical (&scaled_font->base)) {
fs_metrics.max_x_advance = face->max_advance_width / scale;
fs_metrics.max_y_advance = 0;
} else {
fs_metrics.max_x_advance = 0;
fs_metrics.max_y_advance = face->max_advance_height / scale;
}
}
status = _cairo_scaled_font_set_metrics (&scaled_font->base, &fs_metrics);
*font_out = &scaled_font->base;
FAIL:
_cairo_ft_unscaled_font_unlock_face (unscaled);
return status;
}
cairo_bool_t
_cairo_scaled_font_is_ft (cairo_scaled_font_t *scaled_font)
{
return scaled_font->backend == &cairo_ft_scaled_font_backend;
}
static cairo_status_t
_cairo_ft_scaled_font_create_toy (cairo_toy_font_face_t *toy_face,
const cairo_matrix_t *font_matrix,
const cairo_matrix_t *ctm,
const cairo_font_options_t *font_options,
cairo_scaled_font_t **font)
{
FcPattern *pattern, *resolved;
cairo_ft_unscaled_font_t *unscaled;
FcResult result;
int fcslant;
int fcweight;
cairo_matrix_t scale;
cairo_status_t status;
cairo_ft_font_transform_t sf;
cairo_ft_options_t ft_options;
pattern = FcPatternCreate ();
if (!pattern)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (!FcPatternAddString (pattern,
FC_FAMILY, (unsigned char *) toy_face->family))
{
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
switch (toy_face->slant)
{
case CAIRO_FONT_SLANT_ITALIC:
fcslant = FC_SLANT_ITALIC;
break;
case CAIRO_FONT_SLANT_OBLIQUE:
fcslant = FC_SLANT_OBLIQUE;
break;
case CAIRO_FONT_SLANT_NORMAL:
default:
fcslant = FC_SLANT_ROMAN;
break;
}
if (!FcPatternAddInteger (pattern, FC_SLANT, fcslant)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
switch (toy_face->weight)
{
case CAIRO_FONT_WEIGHT_BOLD:
fcweight = FC_WEIGHT_BOLD;
break;
case CAIRO_FONT_WEIGHT_NORMAL:
default:
fcweight = FC_WEIGHT_MEDIUM;
break;
}
if (!FcPatternAddInteger (pattern, FC_WEIGHT, fcweight)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
cairo_matrix_multiply (&scale, font_matrix, ctm);
_compute_transform (&sf, &scale);
if (! FcPatternAddDouble (pattern, FC_PIXEL_SIZE, sf.y_scale)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
if (! FcConfigSubstitute (NULL, pattern, FcMatchPattern)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
if (font_options != NULL) {
status = _cairo_ft_font_options_substitute (font_options, pattern);
if (status)
goto FREE_PATTERN;
}
FcDefaultSubstitute (pattern);
resolved = FcFontMatch (NULL, pattern, &result);
if (!resolved) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_PATTERN;
}
unscaled = _cairo_ft_unscaled_font_create_for_pattern (resolved);
if (!unscaled) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FREE_RESOLVED;
}
_get_pattern_ft_options (resolved, &ft_options);
status = _cairo_ft_scaled_font_create (unscaled,
&toy_face->base,
font_matrix, ctm,
font_options, ft_options,
font);
_cairo_unscaled_font_destroy (&unscaled->base);
FREE_RESOLVED:
FcPatternDestroy (resolved);
FREE_PATTERN:
FcPatternDestroy (pattern);
return status;
}
static void
_cairo_ft_scaled_font_fini (void *abstract_font)
{
cairo_ft_scaled_font_t *scaled_font = abstract_font;
if (scaled_font == NULL)
return;
_cairo_unscaled_font_destroy (&scaled_font->unscaled->base);
}
static int
_move_to (FT_Vector *to, void *closure)
{
cairo_path_fixed_t *path = closure;
cairo_fixed_t x, y;
x = _cairo_fixed_from_26_6 (to->x);
y = _cairo_fixed_from_26_6 (to->y);
if (_cairo_path_fixed_close_path (path) != CAIRO_STATUS_SUCCESS)
return 1;
if (_cairo_path_fixed_move_to (path, x, y) != CAIRO_STATUS_SUCCESS)
return 1;
return 0;
}
static int
_line_to (FT_Vector *to, void *closure)
{
cairo_path_fixed_t *path = closure;
cairo_fixed_t x, y;
x = _cairo_fixed_from_26_6 (to->x);
y = _cairo_fixed_from_26_6 (to->y);
if (_cairo_path_fixed_line_to (path, x, y) != CAIRO_STATUS_SUCCESS)
return 1;
return 0;
}
static int
_conic_to (FT_Vector *control, FT_Vector *to, void *closure)
{
cairo_path_fixed_t *path = closure;
cairo_fixed_t x0, y0;
cairo_fixed_t x1, y1;
cairo_fixed_t x2, y2;
cairo_fixed_t x3, y3;
cairo_point_t conic;
if (! _cairo_path_fixed_get_current_point (path, &x0, &y0))
return 1;
conic.x = _cairo_fixed_from_26_6 (control->x);
conic.y = _cairo_fixed_from_26_6 (control->y);
x3 = _cairo_fixed_from_26_6 (to->x);
y3 = _cairo_fixed_from_26_6 (to->y);
x1 = x0 + 2.0/3.0 * (conic.x - x0);
y1 = y0 + 2.0/3.0 * (conic.y - y0);
x2 = x3 + 2.0/3.0 * (conic.x - x3);
y2 = y3 + 2.0/3.0 * (conic.y - y3);
if (_cairo_path_fixed_curve_to (path,
x1, y1,
x2, y2,
x3, y3) != CAIRO_STATUS_SUCCESS)
return 1;
return 0;
}
static int
_cubic_to (FT_Vector *control1, FT_Vector *control2,
FT_Vector *to, void *closure)
{
cairo_path_fixed_t *path = closure;
cairo_fixed_t x0, y0;
cairo_fixed_t x1, y1;
cairo_fixed_t x2, y2;
x0 = _cairo_fixed_from_26_6 (control1->x);
y0 = _cairo_fixed_from_26_6 (control1->y);
x1 = _cairo_fixed_from_26_6 (control2->x);
y1 = _cairo_fixed_from_26_6 (control2->y);
x2 = _cairo_fixed_from_26_6 (to->x);
y2 = _cairo_fixed_from_26_6 (to->y);
if (_cairo_path_fixed_curve_to (path,
x0, y0,
x1, y1,
x2, y2) != CAIRO_STATUS_SUCCESS)
return 1;
return 0;
}
static cairo_status_t
_decompose_glyph_outline (FT_Face face,
cairo_font_options_t *options,
cairo_path_fixed_t **pathp)
{
static const FT_Outline_Funcs outline_funcs = {
(FT_Outline_MoveToFunc)_move_to,
(FT_Outline_LineToFunc)_line_to,
(FT_Outline_ConicToFunc)_conic_to,
(FT_Outline_CubicToFunc)_cubic_to,
0, /* shift */
0, /* delta */
};
static const FT_Matrix invert_y = {
DOUBLE_TO_16_16 (1.0), 0,
0, DOUBLE_TO_16_16 (-1.0),
};
FT_GlyphSlot glyph;
cairo_path_fixed_t *path;
cairo_status_t status;
path = _cairo_path_fixed_create ();
if (!path)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
glyph = face->glyph;
/* Font glyphs have an inverted Y axis compared to cairo. */
FT_Outline_Transform (&glyph->outline, &invert_y);
if (FT_Outline_Decompose (&glyph->outline, &outline_funcs, path)) {
_cairo_path_fixed_destroy (path);
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
status = _cairo_path_fixed_close_path (path);
if (status) {
_cairo_path_fixed_destroy (path);
return status;
}
*pathp = path;
return CAIRO_STATUS_SUCCESS;
}
/*
* Translate glyph to match its metrics.
*/
static void
_cairo_ft_scaled_glyph_vertical_layout_bearing_fix (void *abstract_font,
FT_GlyphSlot glyph)
{
cairo_ft_scaled_font_t *scaled_font = abstract_font;
FT_Vector vector;
vector.x = glyph->metrics.vertBearingX - glyph->metrics.horiBearingX;
vector.y = -glyph->metrics.vertBearingY - glyph->metrics.horiBearingY;
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
FT_Vector_Transform (&vector, &scaled_font->unscaled->Current_Shape);
FT_Outline_Translate(&glyph->outline, vector.x, vector.y);
} else if (glyph->format == FT_GLYPH_FORMAT_BITMAP) {
glyph->bitmap_left += vector.x / 64;
glyph->bitmap_top += vector.y / 64;
}
}
static cairo_int_status_t
_cairo_ft_scaled_glyph_init (void *abstract_font,
cairo_scaled_glyph_t *scaled_glyph,
cairo_scaled_glyph_info_t info)
{
cairo_text_extents_t fs_metrics;
cairo_ft_scaled_font_t *scaled_font = abstract_font;
cairo_ft_unscaled_font_t *unscaled = scaled_font->unscaled;
FT_GlyphSlot glyph;
FT_Face face;
FT_Error error;
int load_flags = scaled_font->ft_options.load_flags;
FT_Glyph_Metrics *metrics;
double x_factor, y_factor;
cairo_bool_t vertical_layout = FALSE;
cairo_status_t status;
face = _cairo_ft_unscaled_font_lock_face (unscaled);
if (!face)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
status = _cairo_ft_unscaled_font_set_scale (scaled_font->unscaled,
&scaled_font->base.scale);
if (status)
goto FAIL;
/* Ignore global advance unconditionally */
load_flags |= FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
if ((info & CAIRO_SCALED_GLYPH_INFO_PATH) != 0 &&
(info & CAIRO_SCALED_GLYPH_INFO_SURFACE) == 0)
load_flags |= FT_LOAD_NO_BITMAP;
/*
* Don't pass FT_LOAD_VERTICAL_LAYOUT to FT_Load_Glyph here as
* suggested by freetype people.
*/
if (load_flags & FT_LOAD_VERTICAL_LAYOUT) {
load_flags &= ~FT_LOAD_VERTICAL_LAYOUT;
vertical_layout = TRUE;
}
error = FT_Load_Glyph (scaled_font->unscaled->face,
_cairo_scaled_glyph_index(scaled_glyph),
load_flags);
/* XXX ignoring all other errors for now. They are not fatal, typically
* just a glyph-not-found. */
if (error == FT_Err_Out_Of_Memory) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FAIL;
}
glyph = face->glyph;
#if HAVE_FT_GLYPHSLOT_EMBOLDEN
/*
* embolden glyphs if requested
*/
if (scaled_font->ft_options.extra_flags & CAIRO_FT_OPTIONS_EMBOLDEN)
FT_GlyphSlot_Embolden (glyph);
#endif
if (vertical_layout)
_cairo_ft_scaled_glyph_vertical_layout_bearing_fix (scaled_font, glyph);
if (info & CAIRO_SCALED_GLYPH_INFO_METRICS) {
cairo_bool_t hint_metrics = scaled_font->base.options.hint_metrics != CAIRO_HINT_METRICS_OFF;
/*
* Compute font-space metrics
*/
metrics = &glyph->metrics;
if (unscaled->x_scale == 0)
x_factor = 0;
else
x_factor = 1 / unscaled->x_scale;
if (unscaled->y_scale == 0)
y_factor = 0;
else
y_factor = 1 / unscaled->y_scale;
/*
* Note: Y coordinates of the horizontal bearing need to be negated.
*
* Scale metrics back to glyph space from the scaled glyph space returned
* by FreeType
*
* If we want hinted metrics but aren't asking for hinted glyphs from
* FreeType, then we need to do the metric hinting ourselves.
*/
if (hint_metrics && (load_flags & FT_LOAD_NO_HINTING))
{
FT_Pos x1, x2;
FT_Pos y1, y2;
FT_Pos advance;
if (!vertical_layout) {
x1 = (metrics->horiBearingX) & -64;
x2 = (metrics->horiBearingX + metrics->width + 63) & -64;
y1 = (-metrics->horiBearingY) & -64;
y2 = (-metrics->horiBearingY + metrics->height + 63) & -64;
advance = ((metrics->horiAdvance + 32) & -64);
fs_metrics.x_bearing = DOUBLE_FROM_26_6 (x1) * x_factor;
fs_metrics.y_bearing = DOUBLE_FROM_26_6 (y1) * y_factor;
fs_metrics.width = DOUBLE_FROM_26_6 (x2 - x1) * x_factor;
fs_metrics.height = DOUBLE_FROM_26_6 (y2 - y1) * y_factor;
fs_metrics.x_advance = DOUBLE_FROM_26_6 (advance) * x_factor;
fs_metrics.y_advance = 0;
} else {
x1 = (metrics->vertBearingX) & -64;
x2 = (metrics->vertBearingX + metrics->width + 63) & -64;
y1 = (metrics->vertBearingY) & -64;
y2 = (metrics->vertBearingY + metrics->height + 63) & -64;
advance = ((metrics->vertAdvance + 32) & -64);
fs_metrics.x_bearing = DOUBLE_FROM_26_6 (x1) * x_factor;
fs_metrics.y_bearing = DOUBLE_FROM_26_6 (y1) * y_factor;
fs_metrics.width = DOUBLE_FROM_26_6 (x2 - x1) * x_factor;
fs_metrics.height = DOUBLE_FROM_26_6 (y2 - y1) * y_factor;
fs_metrics.x_advance = 0;
fs_metrics.y_advance = DOUBLE_FROM_26_6 (advance) * y_factor;
}
} else {
fs_metrics.width = DOUBLE_FROM_26_6 (metrics->width) * x_factor;
fs_metrics.height = DOUBLE_FROM_26_6 (metrics->height) * y_factor;
if (!vertical_layout) {
fs_metrics.x_bearing = DOUBLE_FROM_26_6 (metrics->horiBearingX) * x_factor;
fs_metrics.y_bearing = DOUBLE_FROM_26_6 (-metrics->horiBearingY) * y_factor;
if (hint_metrics || glyph->format != FT_GLYPH_FORMAT_OUTLINE)
fs_metrics.x_advance = DOUBLE_FROM_26_6 (metrics->horiAdvance) * x_factor;
else
fs_metrics.x_advance = DOUBLE_FROM_16_16 (glyph->linearHoriAdvance) * x_factor;
fs_metrics.y_advance = 0 * y_factor;
} else {
fs_metrics.x_bearing = DOUBLE_FROM_26_6 (metrics->vertBearingX) * x_factor;
fs_metrics.y_bearing = DOUBLE_FROM_26_6 (metrics->vertBearingY) * y_factor;
fs_metrics.x_advance = 0 * x_factor;
if (hint_metrics || glyph->format != FT_GLYPH_FORMAT_OUTLINE)
fs_metrics.y_advance = DOUBLE_FROM_26_6 (metrics->vertAdvance) * y_factor;
else
fs_metrics.y_advance = DOUBLE_FROM_26_6 (glyph->linearVertAdvance) * y_factor;
}
}
_cairo_scaled_glyph_set_metrics (scaled_glyph,
&scaled_font->base,
&fs_metrics);
}
if ((info & CAIRO_SCALED_GLYPH_INFO_SURFACE) != 0) {
cairo_image_surface_t *surface;
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
status = _render_glyph_outline (face, &scaled_font->ft_options.base,
&surface);
} else {
status = _render_glyph_bitmap (face, &scaled_font->ft_options.base,
&surface);
if (status == CAIRO_STATUS_SUCCESS && unscaled->have_shape) {
status = _transform_glyph_bitmap (&unscaled->current_shape,
&surface);
if (status)
cairo_surface_destroy (&surface->base);
}
}
if (status)
goto FAIL;
_cairo_scaled_glyph_set_surface (scaled_glyph,
&scaled_font->base,
surface);
}
if (info & CAIRO_SCALED_GLYPH_INFO_PATH) {
cairo_path_fixed_t *path = NULL; /* hide compiler warning */
/*
* A kludge -- the above code will trash the outline,
* so reload it. This will probably never occur though
*/
if ((info & CAIRO_SCALED_GLYPH_INFO_SURFACE) != 0) {
error = FT_Load_Glyph (face,
_cairo_scaled_glyph_index(scaled_glyph),
load_flags | FT_LOAD_NO_BITMAP);
/* XXX ignoring all other errors for now. They are not fatal, typically
* just a glyph-not-found. */
if (error == FT_Err_Out_Of_Memory) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto FAIL;
}
#if HAVE_FT_GLYPHSLOT_EMBOLDEN
/*
* embolden glyphs if requested
*/
if (scaled_font->ft_options.extra_flags & CAIRO_FT_OPTIONS_EMBOLDEN)
FT_GlyphSlot_Embolden (glyph);
#endif
if (vertical_layout)
_cairo_ft_scaled_glyph_vertical_layout_bearing_fix (scaled_font, glyph);
}
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE)
status = _decompose_glyph_outline (face, &scaled_font->ft_options.base,
&path);
else
status = CAIRO_INT_STATUS_UNSUPPORTED;
if (status)
goto FAIL;
_cairo_scaled_glyph_set_path (scaled_glyph,
&scaled_font->base,
path);
}
FAIL:
_cairo_ft_unscaled_font_unlock_face (unscaled);
return status;
}
static unsigned long
_cairo_ft_ucs4_to_index (void *abstract_font,
uint32_t ucs4)
{
cairo_ft_scaled_font_t *scaled_font = abstract_font;
cairo_ft_unscaled_font_t *unscaled = scaled_font->unscaled;
FT_Face face;
FT_UInt index;
face = _cairo_ft_unscaled_font_lock_face (unscaled);
if (!face)
return 0;
index = FT_Get_Char_Index (face, ucs4);
_cairo_ft_unscaled_font_unlock_face (unscaled);
return index;
}
static cairo_int_status_t
_cairo_ft_load_truetype_table (void *abstract_font,
unsigned long tag,
long offset,
unsigned char *buffer,
unsigned long *length)
{
cairo_ft_scaled_font_t *scaled_font = abstract_font;
cairo_ft_unscaled_font_t *unscaled = scaled_font->unscaled;
FT_Face face;
cairo_status_t status = CAIRO_INT_STATUS_UNSUPPORTED;
if (_cairo_ft_scaled_font_is_vertical (&scaled_font->base))
return CAIRO_INT_STATUS_UNSUPPORTED;
#if HAVE_FT_LOAD_SFNT_TABLE
face = _cairo_ft_unscaled_font_lock_face (unscaled);
if (!face)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (FT_IS_SFNT (face) &&
FT_Load_Sfnt_Table (face, tag, offset, buffer, length) == 0)
status = CAIRO_STATUS_SUCCESS;
_cairo_ft_unscaled_font_unlock_face (unscaled);
#endif
return status;
}
static cairo_int_status_t
_cairo_ft_map_glyphs_to_unicode (void *abstract_font,
cairo_scaled_font_subset_t *font_subset)
{
cairo_ft_scaled_font_t *scaled_font = abstract_font;
cairo_ft_unscaled_font_t *unscaled = scaled_font->unscaled;
FT_Face face;
FT_UInt glyph;
unsigned long charcode;
unsigned int i;
int count;
face = _cairo_ft_unscaled_font_lock_face (unscaled);
if (!face)
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
count = font_subset->num_glyphs;
charcode = FT_Get_First_Char( face, &glyph);
while (glyph != 0 && count > 0)
{
for (i = 0; i < font_subset->num_glyphs; i++) {
if (font_subset->glyphs[i] == glyph) {
font_subset->to_unicode[i] = charcode;
count--;
break;
}
}
charcode = FT_Get_Next_Char (face, charcode, &glyph);
}
_cairo_ft_unscaled_font_unlock_face (unscaled);
return CAIRO_STATUS_SUCCESS;
}
const cairo_scaled_font_backend_t cairo_ft_scaled_font_backend = {
CAIRO_FONT_TYPE_FT,
_cairo_ft_scaled_font_create_toy,
_cairo_ft_scaled_font_fini,
_cairo_ft_scaled_glyph_init,
NULL, /* text_to_glyphs */
_cairo_ft_ucs4_to_index,
NULL, /* show_glyphs */
_cairo_ft_load_truetype_table,
_cairo_ft_map_glyphs_to_unicode,
};
/* #cairo_ft_font_face_t */
static void
_cairo_ft_font_face_destroy (void *abstract_face)
{
cairo_ft_font_face_t *font_face = abstract_face;
cairo_ft_font_face_t *tmp_face = NULL;
cairo_ft_font_face_t *last_face = NULL;
if (font_face == NULL)
return;
/* When destroying the face created by cairo_ft_font_face_create_for_ft_face,
* we have a special "zombie" state for the face when the unscaled font
* is still alive but there are no public references to the font face.
*
* We go from:
*
* font_face ------> unscaled
* <-....weak....../
*
* To:
*
* font_face <------- unscaled
*/
if (font_face->unscaled &&
font_face->unscaled->from_face &&
CAIRO_REFERENCE_COUNT_GET_VALUE (&font_face->unscaled->base.ref_count) > 1)
{
cairo_font_face_reference (&font_face->base);
_cairo_unscaled_font_destroy (&font_face->unscaled->base);
font_face->unscaled = NULL;
return;
}
if (font_face->unscaled) {
/* Remove face from linked list */
for (tmp_face = font_face->unscaled->faces;
tmp_face;
tmp_face = tmp_face->next)
{
if (tmp_face == font_face) {
if (last_face)
last_face->next = tmp_face->next;
else
font_face->unscaled->faces = tmp_face->next;
}
last_face = tmp_face;
}
_cairo_unscaled_font_destroy (&font_face->unscaled->base);
font_face->unscaled = NULL;
}
}
static cairo_status_t
_cairo_ft_font_face_scaled_font_create (void *abstract_face,
const cairo_matrix_t *font_matrix,
const cairo_matrix_t *ctm,
const cairo_font_options_t *options,
cairo_scaled_font_t **scaled_font)
{
cairo_ft_font_face_t *font_face = abstract_face;
cairo_ft_options_t ft_options;
/* The handling of font options is different depending on how the
* font face was created. When the user creates a font face with
* cairo_ft_font_face_create_for_ft_face(), then the load flags
* passed in augment the load flags for the options. But for
* cairo_ft_font_face_create_for_pattern(), the load flags are
* derived from a pattern where the user has called
* cairo_ft_font_options_substitute(), so *just* use those load
* flags and ignore the options.
*/
ft_options = font_face->ft_options;
return _cairo_ft_scaled_font_create (font_face->unscaled,
&font_face->base,
font_matrix, ctm,
options, ft_options,
scaled_font);
}
static const cairo_font_face_backend_t _cairo_ft_font_face_backend = {
CAIRO_FONT_TYPE_FT,
_cairo_ft_font_face_destroy,
_cairo_ft_font_face_scaled_font_create
};
static cairo_font_face_t *
_cairo_ft_font_face_create (cairo_ft_unscaled_font_t *unscaled,
cairo_ft_options_t *ft_options)
{
cairo_ft_font_face_t *font_face, **prev_font_face;
/* Looked for an existing matching font face */
for (font_face = unscaled->faces, prev_font_face = &unscaled->faces;
font_face;
prev_font_face = &font_face->next, font_face = font_face->next)
{
if (font_face->ft_options.load_flags == ft_options->load_flags &&
font_face->ft_options.extra_flags == ft_options->extra_flags &&
cairo_font_options_equal (&font_face->ft_options.base, &ft_options->base))
{
if (! font_face->base.status)
return cairo_font_face_reference (&font_face->base);
/* The font_face has been left in an error state, abandon it. */
*prev_font_face = font_face->next;
break;
}
}
/* No match found, create a new one */
font_face = malloc (sizeof (cairo_ft_font_face_t));
if (!font_face) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return NULL;
}
font_face->unscaled = unscaled;
_cairo_unscaled_font_reference (&unscaled->base);
font_face->ft_options = *ft_options;
font_face->next = unscaled->faces;
unscaled->faces = font_face;
_cairo_font_face_init (&font_face->base, &_cairo_ft_font_face_backend);
return &font_face->base;
}
/* implement the platform-specific interface */
static cairo_status_t
_cairo_ft_font_options_substitute (const cairo_font_options_t *options,
FcPattern *pattern)
{
FcValue v;
if (options->antialias != CAIRO_ANTIALIAS_DEFAULT)
{
if (FcPatternGet (pattern, FC_ANTIALIAS, 0, &v) == FcResultNoMatch)
{
if (! FcPatternAddBool (pattern,
FC_ANTIALIAS,
options->antialias != CAIRO_ANTIALIAS_NONE))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
if (options->antialias != CAIRO_ANTIALIAS_SUBPIXEL) {
FcPatternDel (pattern, FC_RGBA);
if (! FcPatternAddInteger (pattern, FC_RGBA, FC_RGBA_NONE))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
}
}
if (options->antialias != CAIRO_ANTIALIAS_DEFAULT)
{
if (FcPatternGet (pattern, FC_RGBA, 0, &v) == FcResultNoMatch)
{
int rgba;
if (options->antialias == CAIRO_ANTIALIAS_SUBPIXEL) {
switch (options->subpixel_order) {
case CAIRO_SUBPIXEL_ORDER_DEFAULT:
case CAIRO_SUBPIXEL_ORDER_RGB:
default:
rgba = FC_RGBA_RGB;
break;
case CAIRO_SUBPIXEL_ORDER_BGR:
rgba = FC_RGBA_BGR;
break;
case CAIRO_SUBPIXEL_ORDER_VRGB:
rgba = FC_RGBA_VRGB;
break;
case CAIRO_SUBPIXEL_ORDER_VBGR:
rgba = FC_RGBA_VBGR;
break;
}
} else {
rgba = FC_RGBA_NONE;
}
if (! FcPatternAddInteger (pattern, FC_RGBA, rgba))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
}
if (options->hint_style != CAIRO_HINT_STYLE_DEFAULT)
{
if (FcPatternGet (pattern, FC_HINTING, 0, &v) == FcResultNoMatch)
{
if (! FcPatternAddBool (pattern,
FC_HINTING,
options->hint_style != CAIRO_HINT_STYLE_NONE))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
#ifdef FC_HINT_STYLE
if (FcPatternGet (pattern, FC_HINT_STYLE, 0, &v) == FcResultNoMatch)
{
int hint_style;
switch (options->hint_style) {
case CAIRO_HINT_STYLE_NONE:
hint_style = FC_HINT_NONE;
break;
case CAIRO_HINT_STYLE_SLIGHT:
hint_style = FC_HINT_SLIGHT;
break;
case CAIRO_HINT_STYLE_MEDIUM:
hint_style = FC_HINT_MEDIUM;
break;
case CAIRO_HINT_STYLE_FULL:
case CAIRO_HINT_STYLE_DEFAULT:
default:
hint_style = FC_HINT_FULL;
break;
}
if (! FcPatternAddInteger (pattern, FC_HINT_STYLE, hint_style))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
}
#endif
}
return CAIRO_STATUS_SUCCESS;
}
/**
* cairo_ft_font_options_substitute:
* @options: a #cairo_font_options_t object
* @pattern: an existing #FcPattern
*
* Add options to a #FcPattern based on a #cairo_font_options_t font
* options object. Options that are already in the pattern, are not overridden,
* so you should call this function after calling FcConfigSubstitute() (the
* user's settings should override options based on the surface type), but
* before calling FcDefaultSubstitute().
**/
void
cairo_ft_font_options_substitute (const cairo_font_options_t *options,
FcPattern *pattern)
{
if (cairo_font_options_status ((cairo_font_options_t *) options))
return;
_cairo_ft_font_options_substitute (options, pattern);
}
/**
* cairo_ft_font_face_create_for_pattern:
* @pattern: A fully resolved fontconfig
* pattern. A pattern can be resolved, by, among other things, calling
* FcConfigSubstitute(), FcDefaultSubstitute(), then
* FcFontMatch(). Cairo will call FcPatternReference() on this
* pattern, so you should not further modify the pattern, but you can
* release your reference to the pattern with FcPatternDestroy() if
* you no longer need to access it.
*
* Creates a new font face for the FreeType font backend based on a
* fontconfig pattern. This font can then be used with
* cairo_set_font_face() or cairo_scaled_font_create(). The
* #cairo_scaled_font_t returned from cairo_scaled_font_create() is
* also for the FreeType backend and can be used with functions such
* as cairo_ft_font_lock_face().
*
* Font rendering options are represented both here and when you
* call cairo_scaled_font_create(). Font options that have a representation
* in a #FcPattern must be passed in here; to modify #FcPattern
* appropriately to reflect the options in a #cairo_font_options_t, call
* cairo_ft_font_options_substitute().
*
* Return value: a newly created #cairo_font_face_t. Free with
* cairo_font_face_destroy() when you are done using it.
**/
cairo_font_face_t *
cairo_ft_font_face_create_for_pattern (FcPattern *pattern)
{
cairo_ft_unscaled_font_t *unscaled;
cairo_font_face_t *font_face;
cairo_ft_options_t ft_options;
unscaled = _cairo_ft_unscaled_font_create_for_pattern (pattern);
if (unscaled == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return (cairo_font_face_t *)&_cairo_font_face_nil;
}
_get_pattern_ft_options (pattern, &ft_options);
font_face = _cairo_ft_font_face_create (unscaled, &ft_options);
_cairo_unscaled_font_destroy (&unscaled->base);
if (font_face)
return font_face;
else
return (cairo_font_face_t *)&_cairo_font_face_nil;
}
/**
* cairo_ft_font_face_create_for_ft_face:
* @face: A FreeType face object, already opened. This must
* be kept around until the face's ref_count drops to
* zero and it is freed. Since the face may be referenced
* internally to Cairo, the best way to determine when it
* is safe to free the face is to pass a
* #cairo_destroy_func_t to cairo_font_face_set_user_data()
* @load_flags: flags to pass to FT_Load_Glyph when loading
* glyphs from the font. These flags are OR'ed together with
* the flags derived from the #cairo_font_options_t passed
* to cairo_scaled_font_create(), so only a few values such
* as %FT_LOAD_VERTICAL_LAYOUT, and %FT_LOAD_FORCE_AUTOHINT
* are useful. You should not pass any of the flags affecting
* the load target, such as %FT_LOAD_TARGET_LIGHT.
*
* Creates a new font face for the FreeType font backend from a
* pre-opened FreeType face. This font can then be used with
* cairo_set_font_face() or cairo_scaled_font_create(). The
* #cairo_scaled_font_t returned from cairo_scaled_font_create() is
* also for the FreeType backend and can be used with functions such
* as cairo_ft_font_lock_face().
*
* Return value: a newly created #cairo_font_face_t. Free with
* cairo_font_face_destroy() when you are done using it.
**/
cairo_font_face_t *
cairo_ft_font_face_create_for_ft_face (FT_Face face,
int load_flags)
{
cairo_ft_unscaled_font_t *unscaled;
cairo_font_face_t *font_face;
cairo_ft_options_t ft_options;
unscaled = _cairo_ft_unscaled_font_create_from_face (face);
if (unscaled == NULL) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return (cairo_font_face_t *)&_cairo_font_face_nil;
}
ft_options.load_flags = load_flags;
ft_options.extra_flags = 0;
_cairo_font_options_init_default (&ft_options.base);
font_face = _cairo_ft_font_face_create (unscaled, &ft_options);
_cairo_unscaled_font_destroy (&unscaled->base);
if (font_face)
return font_face;
else
return (cairo_font_face_t *)&_cairo_font_face_nil;
}
/**
* cairo_ft_scaled_font_lock_face:
* @scaled_font: A #cairo_scaled_font_t from the FreeType font backend. Such an
* object can be created by calling cairo_scaled_font_create() on a
* FreeType backend font face (see cairo_ft_font_face_create_for_pattern(),
* cairo_ft_font_face_create_for_face()).
*
* cairo_ft_font_lock_face() gets the #FT_Face object from a FreeType
* backend font and scales it appropriately for the font. You must
* release the face with cairo_ft_font_unlock_face()
* when you are done using it. Since the #FT_Face object can be
* shared between multiple #cairo_scaled_font_t objects, you must not
* lock any other font objects until you unlock this one. A count is
* kept of the number of times cairo_ft_font_lock_face() is
* called. cairo_ft_font_unlock_face() must be called the same number
* of times.
*
* You must be careful when using this function in a library or in a
* threaded application, because freetype's design makes it unsafe to
* call freetype functions simultaneously from multiple threads, (even
* if using distinct FT_Face objects). Because of this, application
* code that acquires an FT_Face object with this call must add it's
* own locking to protect any use of that object, (and which also must
* protect any other calls into cairo as almost any cairo function
* might result in a call into the freetype library).
*
* Return value: The #FT_Face object for @font, scaled appropriately,
* or %NULL if @scaled_font is in an error state (see
* cairo_scaled_font_status()) or there is insufficient memory.
**/
FT_Face
cairo_ft_scaled_font_lock_face (cairo_scaled_font_t *abstract_font)
{
cairo_ft_scaled_font_t *scaled_font = (cairo_ft_scaled_font_t *) abstract_font;
FT_Face face;
cairo_status_t status;
if (scaled_font->base.status)
return NULL;
face = _cairo_ft_unscaled_font_lock_face (scaled_font->unscaled);
if (face == NULL) {
status = _cairo_scaled_font_set_error (&scaled_font->base, CAIRO_STATUS_NO_MEMORY);
return NULL;
}
status = _cairo_ft_unscaled_font_set_scale (scaled_font->unscaled,
&scaled_font->base.scale);
if (status) {
_cairo_ft_unscaled_font_unlock_face (scaled_font->unscaled);
status = _cairo_scaled_font_set_error (&scaled_font->base, status);
return NULL;
}
/* Note: We deliberately release the unscaled font's mutex here,
* so that we are not holding a lock across two separate calls to
* cairo function, (which would give the application some
* opportunity for creating deadlock. This is obviously unsafe,
* but as documented, the user must add manual locking when using
* this function. */
CAIRO_MUTEX_UNLOCK (scaled_font->unscaled->mutex);
return face;
}
/**
* cairo_ft_scaled_font_unlock_face:
* @scaled_font: A #cairo_scaled_font_t from the FreeType font backend. Such an
* object can be created by calling cairo_scaled_font_create() on a
* FreeType backend font face (see cairo_ft_font_face_create_for_pattern(),
* cairo_ft_font_face_create_for_ft_face()).
*
* Releases a face obtained with cairo_ft_scaled_font_lock_face().
**/
void
cairo_ft_scaled_font_unlock_face (cairo_scaled_font_t *abstract_font)
{
cairo_ft_scaled_font_t *scaled_font = (cairo_ft_scaled_font_t *) abstract_font;
if (scaled_font->base.status)
return;
/* Note: We released the unscaled font's mutex at the end of
* cairo_ft_scaled_font_lock_face, so we have to acquire it again
* as _cairo_ft_unscaled_font_unlock_face expects it to be held
* when we call into it. */
CAIRO_MUTEX_LOCK (scaled_font->unscaled->mutex);
_cairo_ft_unscaled_font_unlock_face (scaled_font->unscaled);
}
/* We expose our unscaled font implementation internally for the the
* PDF backend, which needs to keep track of the the different
* fonts-on-disk used by a document, so it can embed them.
*/
cairo_unscaled_font_t *
_cairo_ft_scaled_font_get_unscaled_font (cairo_scaled_font_t *abstract_font)
{
cairo_ft_scaled_font_t *scaled_font = (cairo_ft_scaled_font_t *) abstract_font;
return &scaled_font->unscaled->base;
}
cairo_bool_t
_cairo_ft_scaled_font_is_vertical (cairo_scaled_font_t *scaled_font)
{
cairo_ft_scaled_font_t *ft_scaled_font;
if (!_cairo_scaled_font_is_ft (scaled_font))
return FALSE;
ft_scaled_font = (cairo_ft_scaled_font_t *) scaled_font;
if (ft_scaled_font->ft_options.load_flags & FT_LOAD_VERTICAL_LAYOUT)
return TRUE;
return FALSE;
}
void
_cairo_ft_font_reset_static_data (void)
{
_cairo_ft_unscaled_font_map_destroy ();
}
Reference in a new issue View git blame Copy permalink