/* 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 * Owen Taylor * Keith Packard * Carl Worth */ #include #include "cairo-ft-private.h" #include #include #include #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); 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; CAIRO_MUTEX_DECLARE(_cairo_ft_unscaled_font_map_mutex); 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) 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); 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_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_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 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_ft_unscaled_font_map_unlock (); _cairo_unscaled_font_reference (&unscaled->base); return unscaled; } /* Otherwise create it and insert into hash table. */ unscaled = malloc (sizeof (cairo_ft_unscaled_font_t)); if (unscaled == NULL) 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) 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); } 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_fini (unscaled); _cairo_ft_unscaled_font_map_unlock (); } } 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) { CAIRO_MUTEX_UNLOCK (unscaled->mutex); 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 void _compute_transform (cairo_ft_font_transform_t *sf, cairo_matrix_t *scale) { cairo_matrix_t normalized = *scale; double tx, ty; /* 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. */ _cairo_matrix_compute_scale_factors (&normalized, &sf->x_scale, &sf->y_scale, /* XXX */ 1); 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], &tx, &ty); } else { sf->shape[0][0] = sf->shape[1][1] = 1.0; sf->shape[0][1] = sf->shape[1][0] = 0.0; } } /* Temporarily scales an unscaled font to the give scale. We catch * scaling to the same size, since changing a FT_Face is expensive. */ static void _cairo_ft_unscaled_font_set_scale (cairo_ft_unscaled_font_t *unscaled, cairo_matrix_t *scale) { 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; unscaled->have_scale = TRUE; unscaled->current_scale = *scale; _compute_transform (&sf, scale); 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); assert (error == 0); } 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); assert (error == 0); } } /* 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; 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 = malloc (stride * height); if (!data) return 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 = malloc (stride * height); if (!data) return 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 (1, stride_rgba * height); 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: return 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_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 CAIRO_STATUS_NO_MEMORY; } 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 (1, stride * bitmap.rows); if (bitmap.buffer == NULL) { return 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_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. */ 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); if (error) return 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. */ 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 origin_width, origin_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); origin_width = cairo_image_surface_get_width (&(*surface)->base); origin_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] = origin_width; y[1] = 0; x[2] = origin_width; y[2] = origin_height; x[3] = 0; y[3] = origin_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]); if (x[i] > x_max) x_max = ceil (x[i]); if (y[i] < y_min) y_min = floor (y[i]); 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 CAIRO_STATUS_NO_MEMORY; /* Initialize it to empty */ _cairo_surface_fill_rectangle (image, CAIRO_OPERATOR_CLEAR, CAIRO_COLOR_TRANSPARENT, 0, 0, width, height); /* 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); _cairo_surface_composite (CAIRO_OPERATOR_OVER, &pattern.base, NULL, image, 0, 0, 0, 0, 0, 0, width, height); _cairo_pattern_fini (&pattern.base); /* Now update the cache entry for the new bitmap, recomputing * the origin based on the final transform. */ origin_x = - origin_x; origin_y = - origin_y; 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; if (!bitmap) ft_options.load_flags |= FT_LOAD_NO_BITMAP; /* 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_FHINT_STYLE */ } 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; } static cairo_scaled_font_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_ft_scaled_font_t *scaled_font = NULL; FT_Face face; FT_Size_Metrics *metrics; cairo_font_extents_t fs_metrics; face = _cairo_ft_unscaled_font_lock_face (unscaled); if (!face) return NULL; scaled_font = malloc (sizeof(cairo_ft_scaled_font_t)); if (scaled_font == NULL) { _cairo_ft_unscaled_font_unlock_face (unscaled); return NULL; } _cairo_unscaled_font_reference (&unscaled->base); scaled_font->unscaled = unscaled; if (options->hint_metrics != CAIRO_HINT_METRICS_OFF) ft_options.extra_flags |= CAIRO_FT_OPTIONS_HINT_METRICS; _cairo_font_options_init_copy (&scaled_font->ft_options.base, options); _cairo_ft_options_merge (&scaled_font->ft_options, &ft_options); _cairo_scaled_font_init (&scaled_font->base, font_face, font_matrix, ctm, options, &cairo_ft_scaled_font_backend); _cairo_ft_unscaled_font_set_scale (unscaled, &scaled_font->base.scale); metrics = &face->size->metrics; /* * Get to unscaled metrics so that the upper level can get back to * user space */ if (scaled_font->base.options.hint_metrics != CAIRO_HINT_METRICS_OFF) { 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; } } _cairo_scaled_font_set_metrics (&scaled_font->base, &fs_metrics); _cairo_ft_unscaled_font_unlock_face (unscaled); return &scaled_font->base; } 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; cairo_scaled_font_t *new_font = NULL; FcResult result; int fcslant; int fcweight; cairo_matrix_t scale; cairo_ft_font_transform_t sf; cairo_ft_options_t ft_options; unsigned char *family = (unsigned char*) toy_face->family; pattern = FcPatternCreate (); if (!pattern) return CAIRO_STATUS_NO_MEMORY; 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; } 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 (!FcPatternAddString (pattern, FC_FAMILY, family)) goto FREE_PATTERN; if (!FcPatternAddInteger (pattern, FC_SLANT, fcslant)) goto FREE_PATTERN; if (!FcPatternAddInteger (pattern, FC_WEIGHT, fcweight)) goto FREE_PATTERN; cairo_matrix_multiply (&scale, font_matrix, ctm); _compute_transform (&sf, &scale); FcPatternAddInteger (pattern, FC_PIXEL_SIZE, sf.y_scale); FcConfigSubstitute (NULL, pattern, FcMatchPattern); cairo_ft_font_options_substitute (font_options, pattern); FcDefaultSubstitute (pattern); resolved = FcFontMatch (NULL, pattern, &result); if (!resolved) goto FREE_PATTERN; unscaled = _cairo_ft_unscaled_font_create_for_pattern (resolved); if (!unscaled) goto FREE_RESOLVED; _get_pattern_ft_options (resolved, &ft_options); new_font = _cairo_ft_scaled_font_create (unscaled, &toy_face->base, font_matrix, ctm, font_options, ft_options); _cairo_unscaled_font_destroy (&unscaled->base); FREE_RESOLVED: FcPatternDestroy (resolved); FREE_PATTERN: FcPatternDestroy (pattern); if (new_font) { *font = new_font; return CAIRO_STATUS_SUCCESS; } else { return CAIRO_STATUS_NO_MEMORY; } } 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); _cairo_path_fixed_close_path (path); _cairo_path_fixed_move_to (path, x, y); 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); _cairo_path_fixed_line_to (path, x, y); 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; _cairo_path_fixed_get_current_point (path, &x0, &y0); 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); _cairo_path_fixed_curve_to (path, x1, y1, x2, y2, x3, y3); 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); _cairo_path_fixed_curve_to (path, x0, y0, x1, y1, x2, y2); 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; path = _cairo_path_fixed_create (); if (!path) return CAIRO_STATUS_NO_MEMORY; glyph = face->glyph; /* Font glyphs have an inverted Y axis compared to cairo. */ FT_Outline_Transform (&glyph->outline, &invert_y); FT_Outline_Decompose (&glyph->outline, &outline_funcs, path); _cairo_path_fixed_close_path (path); *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 = CAIRO_STATUS_SUCCESS; face = _cairo_ft_unscaled_font_lock_face (unscaled); if (!face) return CAIRO_STATUS_NO_MEMORY; _cairo_ft_unscaled_font_set_scale (scaled_font->unscaled, &scaled_font->base.scale); /* 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); if (error) { status = 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) 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; /* * 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); if (error) { _cairo_ft_unscaled_font_unlock_face (unscaled); return CAIRO_STATUS_NO_MEMORY; } #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_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 void _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; 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); } 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 && 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; *scaled_font = _cairo_ft_scaled_font_create (font_face->unscaled, &font_face->base, font_matrix, ctm, options, ft_options); if (*scaled_font) return CAIRO_STATUS_SUCCESS; else return CAIRO_STATUS_NO_MEMORY; } 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; /* Looked for an existing matching font face */ for (font_face = unscaled->faces; font_face; 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)) return cairo_font_face_reference (&font_face->base); } /* No match found, create a new one */ font_face = malloc (sizeof (cairo_ft_font_face_t)); if (!font_face) 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 */ /** * 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) { FcValue v; if (options->antialias != CAIRO_ANTIALIAS_DEFAULT) { if (FcPatternGet (pattern, FC_ANTIALIAS, 0, &v) == FcResultNoMatch) { FcPatternAddBool (pattern, FC_ANTIALIAS, options->antialias != CAIRO_ANTIALIAS_NONE); if (options->antialias != CAIRO_ANTIALIAS_SUBPIXEL) { FcPatternDel (pattern, FC_RGBA); FcPatternAddInteger (pattern, FC_RGBA, FC_RGBA_NONE); } } } 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; } FcPatternAddInteger (pattern, FC_RGBA, rgba); } } if (options->hint_style != CAIRO_HINT_STYLE_DEFAULT) { if (FcPatternGet (pattern, FC_HINTING, 0, &v) == FcResultNoMatch) { FcPatternAddBool (pattern, FC_HINTING, options->hint_style != CAIRO_HINT_STYLE_NONE); } #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; } FcPatternAddInteger (pattern, FC_HINT_STYLE, hint_style); } #endif } } slim_hidden_def (cairo_ft_font_options_substitute); /** * 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 (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 { _cairo_error (CAIRO_STATUS_NO_MEMORY); 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 (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 { _cairo_error (CAIRO_STATUS_NO_MEMORY); 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; if (scaled_font->base.status) return NULL; face = _cairo_ft_unscaled_font_lock_face (scaled_font->unscaled); if (face == NULL) { _cairo_scaled_font_set_error (&scaled_font->base, CAIRO_STATUS_NO_MEMORY); return NULL; } _cairo_ft_unscaled_font_set_scale (scaled_font->unscaled, &scaled_font->base.scale); /* 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_UNLOCK (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 (); }