| /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ |
| /* |
| * Copyright © 2005 Keith Packard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it either under the terms of the GNU Lesser General Public |
| * License version 2.1 as published by the Free Software Foundation |
| * (the "LGPL") or, at your option, under the terms of the Mozilla |
| * Public License Version 1.1 (the "MPL"). If you do not alter this |
| * notice, a recipient may use your version of this file under either |
| * the MPL or the LGPL. |
| * |
| * You should have received a copy of the LGPL along with this library |
| * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
| * You should have received a copy of the MPL along with this library |
| * in the file COPYING-MPL-1.1 |
| * |
| * The contents of this file are subject to the Mozilla Public License |
| * Version 1.1 (the "License"); you may not use this file except in |
| * compliance with the License. You may obtain a copy of the License at |
| * http://www.mozilla.org/MPL/ |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
| * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
| * the specific language governing rights and limitations. |
| * |
| * The Original Code is the cairo graphics library. |
| * |
| * The Initial Developer of the Original Code is Keith Packard |
| * |
| * Contributor(s): |
| * Keith Packard <keithp@keithp.com> |
| * Carl D. Worth <cworth@cworth.org> |
| * Graydon Hoare <graydon@redhat.com> |
| * Owen Taylor <otaylor@redhat.com> |
| * Behdad Esfahbod <behdad@behdad.org> |
| * Chris Wilson <chris@chris-wilson.co.uk> |
| */ |
| |
| #include "cairoint.h" |
| #include "cairo-error-private.h" |
| #include "cairo-scaled-font-private.h" |
| |
| #if _XOPEN_SOURCE >= 600 || defined (_ISOC99_SOURCE) |
| #define ISFINITE(x) isfinite (x) |
| #else |
| #define ISFINITE(x) ((x) * (x) >= 0.) /* check for NaNs */ |
| #endif |
| |
| /** |
| * SECTION:cairo-scaled-font |
| * @Title: cairo_scaled_font_t |
| * @Short_Description: Font face at particular size and options |
| * @See_Also: #cairo_font_face_t, #cairo_matrix_t, #cairo_font_options_t |
| * |
| * #cairo_scaled_font_t represents a realization of a font face at a particular |
| * size and transformation and a certain set of font options. |
| */ |
| |
| /* Global Glyph Cache |
| * |
| * We maintain a global pool of glyphs split between all active fonts. This |
| * allows a heavily used individual font to cache more glyphs than we could |
| * manage if we used per-font glyph caches, but at the same time maintains |
| * fairness across all fonts and provides a cap on the maximum number of |
| * global glyphs. |
| * |
| * The glyphs are allocated in pages, which are capped in the global pool. |
| * Using pages means we can reduce the frequency at which we have to probe the |
| * global pool and ameliorates the memory allocation pressure. |
| */ |
| |
| /* XXX: This number is arbitrary---we've never done any measurement of this. */ |
| #define MAX_GLYPH_PAGES_CACHED 512 |
| static cairo_cache_t cairo_scaled_glyph_page_cache; |
| |
| #define CAIRO_SCALED_GLYPH_PAGE_SIZE 32 |
| struct _cairo_scaled_glyph_page { |
| cairo_cache_entry_t cache_entry; |
| |
| cairo_list_t link; |
| |
| unsigned int num_glyphs; |
| cairo_scaled_glyph_t glyphs[CAIRO_SCALED_GLYPH_PAGE_SIZE]; |
| }; |
| |
| /* |
| * Notes: |
| * |
| * To store rasterizations of glyphs, we use an image surface and the |
| * device offset to represent the glyph origin. |
| * |
| * A device_transform converts from device space (a conceptual space) to |
| * surface space. For simple cases of translation only, it's called a |
| * device_offset and is public API (cairo_surface_[gs]et_device_offset()). |
| * A possibly better name for those functions could have been |
| * cairo_surface_[gs]et_origin(). So, that's what they do: they set where |
| * the device-space origin (0,0) is in the surface. If the origin is inside |
| * the surface, device_offset values are positive. It may look like this: |
| * |
| * Device space: |
| * (-x,-y) <-- negative numbers |
| * +----------------+ |
| * | . | |
| * | . | |
| * |......(0,0) <---|-- device-space origin |
| * | | |
| * | | |
| * +----------------+ |
| * (width-x,height-y) |
| * |
| * Surface space: |
| * (0,0) <-- surface-space origin |
| * +---------------+ |
| * | . | |
| * | . | |
| * |......(x,y) <--|-- device_offset |
| * | | |
| * | | |
| * +---------------+ |
| * (width,height) |
| * |
| * In other words: device_offset is the coordinates of the device-space |
| * origin relative to the top-left of the surface. |
| * |
| * We use device offsets in a couple of places: |
| * |
| * - Public API: To let toolkits like Gtk+ give user a surface that |
| * only represents part of the final destination (say, the expose |
| * area), but has the same device space as the destination. In these |
| * cases device_offset is typically negative. Example: |
| * |
| * application window |
| * +---------------+ |
| * | . | |
| * | (x,y). | |
| * |......+---+ | |
| * | | | <--|-- expose area |
| * | +---+ | |
| * +---------------+ |
| * |
| * In this case, the user of cairo API can set the device_space on |
| * the expose area to (-x,-y) to move the device space origin to that |
| * of the application window, such that drawing in the expose area |
| * surface and painting it in the application window has the same |
| * effect as drawing in the application window directly. Gtk+ has |
| * been using this feature. |
| * |
| * - Glyph surfaces: In most font rendering systems, glyph surfaces |
| * have an origin at (0,0) and a bounding box that is typically |
| * represented as (x_bearing,y_bearing,width,height). Depending on |
| * which way y progresses in the system, y_bearing may typically be |
| * negative (for systems similar to cairo, with origin at top left), |
| * or be positive (in systems like PDF with origin at bottom left). |
| * No matter which is the case, it is important to note that |
| * (x_bearing,y_bearing) is the coordinates of top-left of the glyph |
| * relative to the glyph origin. That is, for example: |
| * |
| * Scaled-glyph space: |
| * |
| * (x_bearing,y_bearing) <-- negative numbers |
| * +----------------+ |
| * | . | |
| * | . | |
| * |......(0,0) <---|-- glyph origin |
| * | | |
| * | | |
| * +----------------+ |
| * (width+x_bearing,height+y_bearing) |
| * |
| * Note the similarity of the origin to the device space. That is |
| * exactly how we use the device_offset to represent scaled glyphs: |
| * to use the device-space origin as the glyph origin. |
| * |
| * Now compare the scaled-glyph space to device-space and surface-space |
| * and convince yourself that: |
| * |
| * (x_bearing,y_bearing) = (-x,-y) = - device_offset |
| * |
| * That's right. If you are not convinced yet, contrast the definition |
| * of the two: |
| * |
| * "(x_bearing,y_bearing) is the coordinates of top-left of the |
| * glyph relative to the glyph origin." |
| * |
| * "In other words: device_offset is the coordinates of the |
| * device-space origin relative to the top-left of the surface." |
| * |
| * and note that glyph origin = device-space origin. |
| */ |
| |
| static void |
| _cairo_scaled_font_fini_internal (cairo_scaled_font_t *scaled_font); |
| |
| static void |
| _cairo_scaled_glyph_fini (cairo_scaled_font_t *scaled_font, |
| cairo_scaled_glyph_t *scaled_glyph) |
| { |
| const cairo_surface_backend_t *surface_backend = scaled_font->surface_backend; |
| |
| if (surface_backend != NULL && surface_backend->scaled_glyph_fini != NULL) |
| surface_backend->scaled_glyph_fini (scaled_glyph, scaled_font); |
| |
| if (scaled_glyph->surface != NULL) |
| cairo_surface_destroy (&scaled_glyph->surface->base); |
| |
| if (scaled_glyph->path != NULL) |
| _cairo_path_fixed_destroy (scaled_glyph->path); |
| |
| if (scaled_glyph->recording_surface != NULL) { |
| cairo_surface_finish (scaled_glyph->recording_surface); |
| cairo_surface_destroy (scaled_glyph->recording_surface); |
| } |
| } |
| |
| #define ZOMBIE 0 |
| static const cairo_scaled_font_t _cairo_scaled_font_nil = { |
| { ZOMBIE }, /* hash_entry */ |
| CAIRO_STATUS_NO_MEMORY, /* status */ |
| CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ |
| { 0, 0, 0, NULL }, /* user_data */ |
| NULL, /* original_font_face */ |
| NULL, /* font_face */ |
| { 1., 0., 0., 1., 0, 0}, /* font_matrix */ |
| { 1., 0., 0., 1., 0, 0}, /* ctm */ |
| { CAIRO_ANTIALIAS_DEFAULT, /* options */ |
| CAIRO_SUBPIXEL_ORDER_DEFAULT, |
| CAIRO_HINT_STYLE_DEFAULT, |
| CAIRO_HINT_METRICS_DEFAULT} , |
| FALSE, /* placeholder */ |
| FALSE, /* holdover */ |
| TRUE, /* finished */ |
| { 1., 0., 0., 1., 0, 0}, /* scale */ |
| { 1., 0., 0., 1., 0, 0}, /* scale_inverse */ |
| 1., /* max_scale */ |
| { 0., 0., 0., 0., 0. }, /* extents */ |
| { 0., 0., 0., 0., 0. }, /* fs_extents */ |
| CAIRO_MUTEX_NIL_INITIALIZER,/* mutex */ |
| NULL, /* glyphs */ |
| { NULL, NULL }, /* pages */ |
| FALSE, /* cache_frozen */ |
| FALSE, /* global_cache_frozen */ |
| NULL, /* surface_backend */ |
| NULL, /* surface_private */ |
| NULL /* backend */ |
| }; |
| |
| /** |
| * _cairo_scaled_font_set_error: |
| * @scaled_font: a scaled_font |
| * @status: a status value indicating an error |
| * |
| * Atomically sets scaled_font->status to @status and calls _cairo_error; |
| * Does nothing if status is %CAIRO_STATUS_SUCCESS. |
| * |
| * All assignments of an error status to scaled_font->status should happen |
| * through _cairo_scaled_font_set_error(). Note that due to the nature of |
| * the atomic operation, it is not safe to call this function on the nil |
| * objects. |
| * |
| * The purpose of this function is to allow the user to set a |
| * breakpoint in _cairo_error() to generate a stack trace for when the |
| * user causes cairo to detect an error. |
| * |
| * Return value: the error status. |
| **/ |
| cairo_status_t |
| _cairo_scaled_font_set_error (cairo_scaled_font_t *scaled_font, |
| cairo_status_t status) |
| { |
| if (status == CAIRO_STATUS_SUCCESS) |
| return status; |
| |
| /* Don't overwrite an existing error. This preserves the first |
| * error, which is the most significant. */ |
| _cairo_status_set_error (&scaled_font->status, status); |
| |
| return _cairo_error (status); |
| } |
| |
| /** |
| * cairo_scaled_font_get_type: |
| * @scaled_font: a #cairo_scaled_font_t |
| * |
| * This function returns the type of the backend used to create |
| * a scaled font. See #cairo_font_type_t for available types. |
| * However, this function never returns %CAIRO_FONT_TYPE_TOY. |
| * |
| * Return value: The type of @scaled_font. |
| * |
| * Since: 1.2 |
| **/ |
| cairo_font_type_t |
| cairo_scaled_font_get_type (cairo_scaled_font_t *scaled_font) |
| { |
| if (CAIRO_REFERENCE_COUNT_IS_INVALID (&scaled_font->ref_count)) |
| return CAIRO_FONT_TYPE_TOY; |
| |
| return scaled_font->backend->type; |
| } |
| |
| /** |
| * cairo_scaled_font_status: |
| * @scaled_font: a #cairo_scaled_font_t |
| * |
| * Checks whether an error has previously occurred for this |
| * scaled_font. |
| * |
| * Return value: %CAIRO_STATUS_SUCCESS or another error such as |
| * %CAIRO_STATUS_NO_MEMORY. |
| **/ |
| cairo_status_t |
| cairo_scaled_font_status (cairo_scaled_font_t *scaled_font) |
| { |
| return scaled_font->status; |
| } |
| slim_hidden_def (cairo_scaled_font_status); |
| |
| /* Here we keep a unique mapping from |
| * font_face/matrix/ctm/font_options => #cairo_scaled_font_t. |
| * |
| * Here are the things that we want to map: |
| * |
| * a) All otherwise referenced #cairo_scaled_font_t's |
| * b) Some number of not otherwise referenced #cairo_scaled_font_t's |
| * |
| * The implementation uses a hash table which covers (a) |
| * completely. Then, for (b) we have an array of otherwise |
| * unreferenced fonts (holdovers) which are expired in |
| * least-recently-used order. |
| * |
| * The cairo_scaled_font_create() code gets to treat this like a regular |
| * hash table. All of the magic for the little holdover cache is in |
| * cairo_scaled_font_reference() and cairo_scaled_font_destroy(). |
| */ |
| |
| /* This defines the size of the holdover array ... that is, the number |
| * of scaled fonts we keep around even when not otherwise referenced |
| */ |
| #define CAIRO_SCALED_FONT_MAX_HOLDOVERS 256 |
| |
| typedef struct _cairo_scaled_font_map { |
| cairo_scaled_font_t *mru_scaled_font; |
| cairo_hash_table_t *hash_table; |
| cairo_scaled_font_t *holdovers[CAIRO_SCALED_FONT_MAX_HOLDOVERS]; |
| int num_holdovers; |
| } cairo_scaled_font_map_t; |
| |
| static cairo_scaled_font_map_t *cairo_scaled_font_map; |
| |
| static int |
| _cairo_scaled_font_keys_equal (const void *abstract_key_a, const void *abstract_key_b); |
| |
| static cairo_scaled_font_map_t * |
| _cairo_scaled_font_map_lock (void) |
| { |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| |
| if (cairo_scaled_font_map == NULL) { |
| cairo_scaled_font_map = malloc (sizeof (cairo_scaled_font_map_t)); |
| if (unlikely (cairo_scaled_font_map == NULL)) |
| goto CLEANUP_MUTEX_LOCK; |
| |
| cairo_scaled_font_map->mru_scaled_font = NULL; |
| cairo_scaled_font_map->hash_table = |
| _cairo_hash_table_create (_cairo_scaled_font_keys_equal); |
| |
| if (unlikely (cairo_scaled_font_map->hash_table == NULL)) |
| goto CLEANUP_SCALED_FONT_MAP; |
| |
| cairo_scaled_font_map->num_holdovers = 0; |
| } |
| |
| return cairo_scaled_font_map; |
| |
| CLEANUP_SCALED_FONT_MAP: |
| free (cairo_scaled_font_map); |
| cairo_scaled_font_map = NULL; |
| CLEANUP_MUTEX_LOCK: |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); |
| return NULL; |
| } |
| |
| static void |
| _cairo_scaled_font_map_unlock (void) |
| { |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| } |
| |
| void |
| _cairo_scaled_font_map_destroy (void) |
| { |
| cairo_scaled_font_map_t *font_map; |
| cairo_scaled_font_t *scaled_font; |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| |
| font_map = cairo_scaled_font_map; |
| if (unlikely (font_map == NULL)) { |
| goto CLEANUP_MUTEX_LOCK; |
| } |
| |
| scaled_font = font_map->mru_scaled_font; |
| if (scaled_font != NULL) { |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| cairo_scaled_font_destroy (scaled_font); |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| } |
| |
| /* remove scaled_fonts starting from the end so that font_map->holdovers |
| * is always in a consistent state when we release the mutex. */ |
| while (font_map->num_holdovers) { |
| scaled_font = font_map->holdovers[font_map->num_holdovers-1]; |
| assert (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&scaled_font->ref_count)); |
| _cairo_hash_table_remove (font_map->hash_table, |
| &scaled_font->hash_entry); |
| |
| font_map->num_holdovers--; |
| |
| /* This releases the font_map lock to avoid the possibility of a |
| * recursive deadlock when the scaled font destroy closure gets |
| * called |
| */ |
| _cairo_scaled_font_fini (scaled_font); |
| |
| free (scaled_font); |
| } |
| |
| _cairo_hash_table_destroy (font_map->hash_table); |
| |
| free (cairo_scaled_font_map); |
| cairo_scaled_font_map = NULL; |
| |
| CLEANUP_MUTEX_LOCK: |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| } |
| static void |
| _cairo_scaled_glyph_page_destroy (void *closure) |
| { |
| cairo_scaled_glyph_page_t *page = closure; |
| cairo_scaled_font_t *scaled_font; |
| unsigned int n; |
| |
| scaled_font = (cairo_scaled_font_t *) page->cache_entry.hash; |
| for (n = 0; n < page->num_glyphs; n++) { |
| _cairo_hash_table_remove (scaled_font->glyphs, |
| &page->glyphs[n].hash_entry); |
| _cairo_scaled_glyph_fini (scaled_font, &page->glyphs[n]); |
| } |
| |
| cairo_list_del (&page->link); |
| |
| free (page); |
| } |
| |
| /* If a scaled font wants to unlock the font map while still being |
| * created (needed for user-fonts), we need to take extra care not |
| * ending up with multiple identical scaled fonts being created. |
| * |
| * What we do is, we create a fake identical scaled font, and mark |
| * it as placeholder, lock its mutex, and insert that in the fontmap |
| * hash table. This makes other code trying to create an identical |
| * scaled font to just wait and retry. |
| * |
| * The reason we have to create a fake scaled font instead of just using |
| * scaled_font is for lifecycle management: we need to (or rather, |
| * other code needs to) reference the scaled_font in the hash table. |
| * We can't do that on the input scaled_font as it may be freed by |
| * font backend upon error. |
| */ |
| |
| cairo_status_t |
| _cairo_scaled_font_register_placeholder_and_unlock_font_map (cairo_scaled_font_t *scaled_font) |
| { |
| cairo_status_t status; |
| cairo_scaled_font_t *placeholder_scaled_font; |
| |
| assert (CAIRO_MUTEX_IS_LOCKED (_cairo_scaled_font_map_mutex)); |
| |
| status = scaled_font->status; |
| if (unlikely (status)) |
| return status; |
| |
| placeholder_scaled_font = malloc (sizeof (cairo_scaled_font_t)); |
| if (unlikely (placeholder_scaled_font == NULL)) |
| return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| |
| /* full initialization is wasteful, but who cares... */ |
| status = _cairo_scaled_font_init (placeholder_scaled_font, |
| scaled_font->font_face, |
| &scaled_font->font_matrix, |
| &scaled_font->ctm, |
| &scaled_font->options, |
| NULL); |
| if (unlikely (status)) |
| goto FREE_PLACEHOLDER; |
| |
| placeholder_scaled_font->placeholder = TRUE; |
| |
| status = _cairo_hash_table_insert (cairo_scaled_font_map->hash_table, |
| &placeholder_scaled_font->hash_entry); |
| if (unlikely (status)) |
| goto FINI_PLACEHOLDER; |
| |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| CAIRO_MUTEX_LOCK (placeholder_scaled_font->mutex); |
| |
| return CAIRO_STATUS_SUCCESS; |
| |
| FINI_PLACEHOLDER: |
| _cairo_scaled_font_fini_internal (placeholder_scaled_font); |
| FREE_PLACEHOLDER: |
| free (placeholder_scaled_font); |
| |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| } |
| |
| void |
| _cairo_scaled_font_unregister_placeholder_and_lock_font_map (cairo_scaled_font_t *scaled_font) |
| { |
| cairo_scaled_font_t *placeholder_scaled_font; |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| |
| placeholder_scaled_font = |
| _cairo_hash_table_lookup (cairo_scaled_font_map->hash_table, |
| &scaled_font->hash_entry); |
| assert (placeholder_scaled_font != NULL); |
| assert (placeholder_scaled_font->placeholder); |
| assert (CAIRO_MUTEX_IS_LOCKED (placeholder_scaled_font->mutex)); |
| |
| _cairo_hash_table_remove (cairo_scaled_font_map->hash_table, |
| &placeholder_scaled_font->hash_entry); |
| |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| |
| CAIRO_MUTEX_UNLOCK (placeholder_scaled_font->mutex); |
| cairo_scaled_font_destroy (placeholder_scaled_font); |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| } |
| |
| static void |
| _cairo_scaled_font_placeholder_wait_for_creation_to_finish (cairo_scaled_font_t *placeholder_scaled_font) |
| { |
| /* reference the place holder so it doesn't go away */ |
| cairo_scaled_font_reference (placeholder_scaled_font); |
| |
| /* now unlock the fontmap mutex so creation has a chance to finish */ |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| |
| /* wait on placeholder mutex until we are awaken */ |
| CAIRO_MUTEX_LOCK (placeholder_scaled_font->mutex); |
| |
| /* ok, creation done. just clean up and back out */ |
| CAIRO_MUTEX_UNLOCK (placeholder_scaled_font->mutex); |
| cairo_scaled_font_destroy (placeholder_scaled_font); |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| } |
| |
| /* Fowler / Noll / Vo (FNV) Hash (http://www.isthe.com/chongo/tech/comp/fnv/) |
| * |
| * Not necessarily better than a lot of other hashes, but should be OK, and |
| * well tested with binary data. |
| */ |
| |
| #define FNV_32_PRIME ((uint32_t)0x01000193) |
| #define FNV1_32_INIT ((uint32_t)0x811c9dc5) |
| |
| static uint32_t |
| _hash_matrix_fnv (const cairo_matrix_t *matrix, |
| uint32_t hval) |
| { |
| const uint8_t *buffer = (const uint8_t *) matrix; |
| int len = sizeof (cairo_matrix_t); |
| do { |
| hval *= FNV_32_PRIME; |
| hval ^= *buffer++; |
| } while (--len); |
| |
| return hval; |
| } |
| |
| static uint32_t |
| _hash_mix_bits (uint32_t hash) |
| { |
| hash += hash << 12; |
| hash ^= hash >> 7; |
| hash += hash << 3; |
| hash ^= hash >> 17; |
| hash += hash << 5; |
| return hash; |
| } |
| |
| static void |
| _cairo_scaled_font_init_key (cairo_scaled_font_t *scaled_font, |
| cairo_font_face_t *font_face, |
| const cairo_matrix_t *font_matrix, |
| const cairo_matrix_t *ctm, |
| const cairo_font_options_t *options) |
| { |
| uint32_t hash = FNV1_32_INIT; |
| |
| scaled_font->status = CAIRO_STATUS_SUCCESS; |
| scaled_font->placeholder = FALSE; |
| scaled_font->font_face = font_face; |
| scaled_font->font_matrix = *font_matrix; |
| scaled_font->ctm = *ctm; |
| /* ignore translation values in the ctm */ |
| scaled_font->ctm.x0 = 0.; |
| scaled_font->ctm.y0 = 0.; |
| _cairo_font_options_init_copy (&scaled_font->options, options); |
| |
| /* We do a bytewise hash on the font matrices */ |
| hash = _hash_matrix_fnv (&scaled_font->font_matrix, hash); |
| hash = _hash_matrix_fnv (&scaled_font->ctm, hash); |
| hash = _hash_mix_bits (hash); |
| |
| hash ^= (unsigned long) scaled_font->font_face; |
| hash ^= cairo_font_options_hash (&scaled_font->options); |
| |
| /* final mixing of bits */ |
| hash = _hash_mix_bits (hash); |
| |
| assert (hash != ZOMBIE); |
| scaled_font->hash_entry.hash = hash; |
| } |
| |
| static cairo_bool_t |
| _cairo_scaled_font_keys_equal (const void *abstract_key_a, |
| const void *abstract_key_b) |
| { |
| const cairo_scaled_font_t *key_a = abstract_key_a; |
| const cairo_scaled_font_t *key_b = abstract_key_b; |
| |
| if (key_a->hash_entry.hash != key_b->hash_entry.hash) |
| return FALSE; |
| |
| return key_a->font_face == key_b->font_face && |
| memcmp ((unsigned char *)(&key_a->font_matrix.xx), |
| (unsigned char *)(&key_b->font_matrix.xx), |
| sizeof(cairo_matrix_t)) == 0 && |
| memcmp ((unsigned char *)(&key_a->ctm.xx), |
| (unsigned char *)(&key_b->ctm.xx), |
| sizeof(cairo_matrix_t)) == 0 && |
| cairo_font_options_equal (&key_a->options, &key_b->options); |
| } |
| |
| static cairo_bool_t |
| _cairo_scaled_font_matches (const cairo_scaled_font_t *scaled_font, |
| const cairo_font_face_t *font_face, |
| const cairo_matrix_t *font_matrix, |
| const cairo_matrix_t *ctm, |
| const cairo_font_options_t *options) |
| { |
| return scaled_font->original_font_face == font_face && |
| memcmp ((unsigned char *)(&scaled_font->font_matrix.xx), |
| (unsigned char *)(&font_matrix->xx), |
| sizeof(cairo_matrix_t)) == 0 && |
| memcmp ((unsigned char *)(&scaled_font->ctm.xx), |
| (unsigned char *)(&ctm->xx), |
| sizeof(cairo_matrix_t)) == 0 && |
| cairo_font_options_equal (&scaled_font->options, options); |
| } |
| |
| static cairo_bool_t |
| _cairo_scaled_glyphs_equal (const void *abstract_a, const void *abstract_b) |
| { |
| const cairo_scaled_glyph_t *a = abstract_a; |
| const cairo_scaled_glyph_t *b = abstract_b; |
| |
| return a->hash_entry.hash == b->hash_entry.hash; |
| } |
| |
| /* |
| * Basic #cairo_scaled_font_t object management |
| */ |
| |
| cairo_status_t |
| _cairo_scaled_font_init (cairo_scaled_font_t *scaled_font, |
| cairo_font_face_t *font_face, |
| const cairo_matrix_t *font_matrix, |
| const cairo_matrix_t *ctm, |
| const cairo_font_options_t *options, |
| const cairo_scaled_font_backend_t *backend) |
| { |
| cairo_status_t status; |
| |
| status = cairo_font_options_status ((cairo_font_options_t *) options); |
| if (unlikely (status)) |
| return status; |
| |
| _cairo_scaled_font_init_key (scaled_font, font_face, |
| font_matrix, ctm, options); |
| |
| cairo_matrix_multiply (&scaled_font->scale, |
| &scaled_font->font_matrix, |
| &scaled_font->ctm); |
| |
| scaled_font->max_scale = MAX (fabs (scaled_font->scale.xx) + fabs (scaled_font->scale.xy), |
| fabs (scaled_font->scale.yx) + fabs (scaled_font->scale.yy)); |
| scaled_font->scale_inverse = scaled_font->scale; |
| status = cairo_matrix_invert (&scaled_font->scale_inverse); |
| if (unlikely (status)) { |
| /* If the font scale matrix is rank 0, just using an all-zero inverse matrix |
| * makes everything work correctly. This make font size 0 work without |
| * producing an error. |
| * |
| * FIXME: If the scale is rank 1, we still go into error mode. But then |
| * again, that's what we do everywhere in cairo. |
| * |
| * Also, the check for == 0. below may be too harsh... |
| */ |
| if (_cairo_matrix_is_scale_0 (&scaled_font->scale)) { |
| cairo_matrix_init (&scaled_font->scale_inverse, |
| 0, 0, 0, 0, |
| -scaled_font->scale.x0, |
| -scaled_font->scale.y0); |
| } else |
| return status; |
| } |
| |
| scaled_font->glyphs = _cairo_hash_table_create (_cairo_scaled_glyphs_equal); |
| if (unlikely (scaled_font->glyphs == NULL)) |
| return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| |
| cairo_list_init (&scaled_font->glyph_pages); |
| scaled_font->cache_frozen = FALSE; |
| scaled_font->global_cache_frozen = FALSE; |
| |
| scaled_font->holdover = FALSE; |
| scaled_font->finished = FALSE; |
| |
| CAIRO_REFERENCE_COUNT_INIT (&scaled_font->ref_count, 1); |
| |
| _cairo_user_data_array_init (&scaled_font->user_data); |
| |
| cairo_font_face_reference (font_face); |
| scaled_font->original_font_face = NULL; |
| |
| CAIRO_MUTEX_INIT (scaled_font->mutex); |
| |
| scaled_font->surface_backend = NULL; |
| scaled_font->surface_private = NULL; |
| |
| scaled_font->backend = backend; |
| cairo_list_init (&scaled_font->link); |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| void |
| _cairo_scaled_font_freeze_cache (cairo_scaled_font_t *scaled_font) |
| { |
| /* ensure we do not modify an error object */ |
| assert (scaled_font->status == CAIRO_STATUS_SUCCESS); |
| |
| CAIRO_MUTEX_LOCK (scaled_font->mutex); |
| scaled_font->cache_frozen = TRUE; |
| } |
| |
| void |
| _cairo_scaled_font_thaw_cache (cairo_scaled_font_t *scaled_font) |
| { |
| scaled_font->cache_frozen = FALSE; |
| |
| if (scaled_font->global_cache_frozen) { |
| CAIRO_MUTEX_LOCK (_cairo_scaled_glyph_page_cache_mutex); |
| _cairo_cache_thaw (&cairo_scaled_glyph_page_cache); |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_glyph_page_cache_mutex); |
| |
| scaled_font->global_cache_frozen = FALSE; |
| } |
| |
| CAIRO_MUTEX_UNLOCK (scaled_font->mutex); |
| } |
| |
| void |
| _cairo_scaled_font_reset_cache (cairo_scaled_font_t *scaled_font) |
| { |
| assert (! scaled_font->cache_frozen); |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_glyph_page_cache_mutex); |
| while (! cairo_list_is_empty (&scaled_font->glyph_pages)) { |
| _cairo_cache_remove (&cairo_scaled_glyph_page_cache, |
| &cairo_list_first_entry (&scaled_font->glyph_pages, |
| cairo_scaled_glyph_page_t, |
| link)->cache_entry); |
| } |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_glyph_page_cache_mutex); |
| } |
| |
| cairo_status_t |
| _cairo_scaled_font_set_metrics (cairo_scaled_font_t *scaled_font, |
| cairo_font_extents_t *fs_metrics) |
| { |
| cairo_status_t status; |
| double font_scale_x, font_scale_y; |
| |
| scaled_font->fs_extents = *fs_metrics; |
| |
| status = _cairo_matrix_compute_basis_scale_factors (&scaled_font->font_matrix, |
| &font_scale_x, &font_scale_y, |
| 1); |
| if (unlikely (status)) |
| return status; |
| |
| /* |
| * The font responded in unscaled units, scale by the font |
| * matrix scale factors to get to user space |
| */ |
| |
| scaled_font->extents.ascent = fs_metrics->ascent * font_scale_y; |
| scaled_font->extents.descent = fs_metrics->descent * font_scale_y; |
| scaled_font->extents.height = fs_metrics->height * font_scale_y; |
| scaled_font->extents.max_x_advance = fs_metrics->max_x_advance * font_scale_x; |
| scaled_font->extents.max_y_advance = fs_metrics->max_y_advance * font_scale_y; |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| static void |
| _cairo_scaled_font_fini_internal (cairo_scaled_font_t *scaled_font) |
| { |
| scaled_font->finished = TRUE; |
| |
| _cairo_scaled_font_reset_cache (scaled_font); |
| _cairo_hash_table_destroy (scaled_font->glyphs); |
| |
| cairo_font_face_destroy (scaled_font->font_face); |
| cairo_font_face_destroy (scaled_font->original_font_face); |
| |
| CAIRO_MUTEX_FINI (scaled_font->mutex); |
| |
| if (scaled_font->surface_backend != NULL && |
| scaled_font->surface_backend->scaled_font_fini != NULL) |
| scaled_font->surface_backend->scaled_font_fini (scaled_font); |
| |
| if (scaled_font->backend != NULL && scaled_font->backend->fini != NULL) |
| scaled_font->backend->fini (scaled_font); |
| |
| _cairo_user_data_array_fini (&scaled_font->user_data); |
| } |
| |
| /* XXX: allow multiple backends to share the font */ |
| void |
| _cairo_scaled_font_revoke_ownership (cairo_scaled_font_t *scaled_font) |
| { |
| if (scaled_font->surface_backend == NULL) |
| return; |
| |
| _cairo_scaled_font_reset_cache (scaled_font); |
| |
| if (scaled_font->surface_backend->scaled_font_fini != NULL) |
| scaled_font->surface_backend->scaled_font_fini (scaled_font); |
| |
| scaled_font->surface_backend = NULL; |
| scaled_font->surface_private = NULL; |
| } |
| |
| void |
| _cairo_scaled_font_fini (cairo_scaled_font_t *scaled_font) |
| { |
| /* Release the lock to avoid the possibility of a recursive |
| * deadlock when the scaled font destroy closure gets called. */ |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_map_mutex); |
| _cairo_scaled_font_fini_internal (scaled_font); |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_map_mutex); |
| } |
| |
| /** |
| * cairo_scaled_font_create: |
| * @font_face: a #cairo_font_face_t |
| * @font_matrix: font space to user space transformation matrix for the |
| * font. In the simplest case of a N point font, this matrix is |
| * just a scale by N, but it can also be used to shear the font |
| * or stretch it unequally along the two axes. See |
| * cairo_set_font_matrix(). |
| * @ctm: user to device transformation matrix with which the font will |
| * be used. |
| * @options: options to use when getting metrics for the font and |
| * rendering with it. |
| * |
| * Creates a #cairo_scaled_font_t object from a font face and matrices that |
| * describe the size of the font and the environment in which it will |
| * be used. |
| * |
| * Return value: a newly created #cairo_scaled_font_t. Destroy with |
| * cairo_scaled_font_destroy() |
| **/ |
| cairo_scaled_font_t * |
| cairo_scaled_font_create (cairo_font_face_t *font_face, |
| const cairo_matrix_t *font_matrix, |
| const cairo_matrix_t *ctm, |
| const cairo_font_options_t *options) |
| { |
| cairo_status_t status; |
| cairo_scaled_font_map_t *font_map; |
| cairo_font_face_t *original_font_face = font_face; |
| cairo_scaled_font_t key, *old = NULL, *scaled_font = NULL, *dead = NULL; |
| double det; |
| |
| status = font_face->status; |
| if (unlikely (status)) |
| return _cairo_scaled_font_create_in_error (status); |
| |
| det = _cairo_matrix_compute_determinant (font_matrix); |
| if (! ISFINITE (det)) |
| return _cairo_scaled_font_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_MATRIX)); |
| |
| det = _cairo_matrix_compute_determinant (ctm); |
| if (! ISFINITE (det)) |
| return _cairo_scaled_font_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_MATRIX)); |
| |
| status = cairo_font_options_status ((cairo_font_options_t *) options); |
| if (unlikely (status)) |
| return _cairo_scaled_font_create_in_error (status); |
| |
| /* Note that degenerate ctm or font_matrix *are* allowed. |
| * We want to support a font size of 0. */ |
| |
| font_map = _cairo_scaled_font_map_lock (); |
| if (unlikely (font_map == NULL)) |
| return _cairo_scaled_font_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); |
| |
| scaled_font = font_map->mru_scaled_font; |
| if (scaled_font != NULL && |
| _cairo_scaled_font_matches (scaled_font, |
| font_face, font_matrix, ctm, options)) |
| { |
| assert (scaled_font->hash_entry.hash != ZOMBIE); |
| assert (! scaled_font->placeholder); |
| |
| if (likely (scaled_font->status == CAIRO_STATUS_SUCCESS)) { |
| /* We increment the reference count manually here, (rather |
| * than calling into cairo_scaled_font_reference), since we |
| * must modify the reference count while our lock is still |
| * held. */ |
| _cairo_reference_count_inc (&scaled_font->ref_count); |
| _cairo_scaled_font_map_unlock (); |
| return scaled_font; |
| } |
| |
| /* the font has been put into an error status - abandon the cache */ |
| _cairo_hash_table_remove (font_map->hash_table, |
| &scaled_font->hash_entry); |
| scaled_font->hash_entry.hash = ZOMBIE; |
| dead = scaled_font; |
| font_map->mru_scaled_font = NULL; |
| |
| if (font_face->backend->get_implementation != NULL) { |
| font_face = font_face->backend->get_implementation (font_face, |
| font_matrix, |
| ctm, |
| options); |
| if (unlikely (font_face->status)) { |
| _cairo_scaled_font_map_unlock (); |
| cairo_scaled_font_destroy (scaled_font); |
| return _cairo_scaled_font_create_in_error (font_face->status); |
| } |
| } |
| |
| _cairo_scaled_font_init_key (&key, font_face, |
| font_matrix, ctm, options); |
| } |
| else |
| { |
| if (font_face->backend->get_implementation != NULL) { |
| font_face = font_face->backend->get_implementation (font_face, |
| font_matrix, |
| ctm, |
| options); |
| if (unlikely (font_face->status)) { |
| _cairo_scaled_font_map_unlock (); |
| return _cairo_scaled_font_create_in_error (font_face->status); |
| } |
| } |
| |
| _cairo_scaled_font_init_key (&key, font_face, |
| font_matrix, ctm, options); |
| |
| while ((scaled_font = _cairo_hash_table_lookup (font_map->hash_table, |
| &key.hash_entry))) |
| { |
| if (! scaled_font->placeholder) |
| break; |
| |
| /* If the scaled font is being created (happens for user-font), |
| * just wait until it's done, then retry */ |
| _cairo_scaled_font_placeholder_wait_for_creation_to_finish (scaled_font); |
| } |
| |
| /* Return existing scaled_font if it exists in the hash table. */ |
| if (scaled_font != NULL) { |
| /* If the original reference count is 0, then this font must have |
| * been found in font_map->holdovers, (which means this caching is |
| * actually working). So now we remove it from the holdovers |
| * array, unless we caught the font in the middle of destruction. |
| */ |
| if (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&scaled_font->ref_count)) { |
| if (scaled_font->holdover) { |
| int i; |
| |
| for (i = 0; i < font_map->num_holdovers; i++) { |
| if (font_map->holdovers[i] == scaled_font) { |
| font_map->num_holdovers--; |
| memmove (&font_map->holdovers[i], |
| &font_map->holdovers[i+1], |
| (font_map->num_holdovers - i) * sizeof (cairo_scaled_font_t*)); |
| break; |
| } |
| } |
| |
| scaled_font->holdover = FALSE; |
| } |
| |
| /* reset any error status */ |
| scaled_font->status = CAIRO_STATUS_SUCCESS; |
| } |
| |
| if (likely (scaled_font->status == CAIRO_STATUS_SUCCESS)) { |
| /* We increment the reference count manually here, (rather |
| * than calling into cairo_scaled_font_reference), since we |
| * must modify the reference count while our lock is still |
| * held. */ |
| |
| old = font_map->mru_scaled_font; |
| font_map->mru_scaled_font = scaled_font; |
| /* increment reference count for the mru cache */ |
| _cairo_reference_count_inc (&scaled_font->ref_count); |
| /* and increment for the returned reference */ |
| _cairo_reference_count_inc (&scaled_font->ref_count); |
| _cairo_scaled_font_map_unlock (); |
| |
| cairo_scaled_font_destroy (old); |
| if (font_face != original_font_face) |
| cairo_font_face_destroy (font_face); |
| |
| return scaled_font; |
| } |
| |
| /* the font has been put into an error status - abandon the cache */ |
| _cairo_hash_table_remove (font_map->hash_table, |
| &scaled_font->hash_entry); |
| scaled_font->hash_entry.hash = ZOMBIE; |
| } |
| } |
| |
| /* Otherwise create it and insert it into the hash table. */ |
| status = font_face->backend->scaled_font_create (font_face, font_matrix, |
| ctm, options, &scaled_font); |
| /* Did we leave the backend in an error state? */ |
| if (unlikely (status)) { |
| _cairo_scaled_font_map_unlock (); |
| if (font_face != original_font_face) |
| cairo_font_face_destroy (font_face); |
| |
| if (dead != NULL) |
| cairo_scaled_font_destroy (dead); |
| |
| status = _cairo_font_face_set_error (font_face, status); |
| return _cairo_scaled_font_create_in_error (status); |
| } |
| /* Or did we encounter an error whilst constructing the scaled font? */ |
| if (unlikely (scaled_font->status)) { |
| _cairo_scaled_font_map_unlock (); |
| if (font_face != original_font_face) |
| cairo_font_face_destroy (font_face); |
| |
| if (dead != NULL) |
| cairo_scaled_font_destroy (dead); |
| |
| return scaled_font; |
| } |
| |
| /* Our caching above is defeated if the backend switches fonts on us - |
| * e.g. old incarnations of toy-font-face and lazily resolved |
| * ft-font-faces |
| */ |
| assert (scaled_font->font_face == font_face); |
| |
| scaled_font->original_font_face = |
| cairo_font_face_reference (original_font_face); |
| |
| status = _cairo_hash_table_insert (font_map->hash_table, |
| &scaled_font->hash_entry); |
| if (likely (status == CAIRO_STATUS_SUCCESS)) { |
| old = font_map->mru_scaled_font; |
| font_map->mru_scaled_font = scaled_font; |
| _cairo_reference_count_inc (&scaled_font->ref_count); |
| } |
| |
| _cairo_scaled_font_map_unlock (); |
| |
| cairo_scaled_font_destroy (old); |
| if (font_face != original_font_face) |
| cairo_font_face_destroy (font_face); |
| |
| if (dead != NULL) |
| cairo_scaled_font_destroy (dead); |
| |
| if (unlikely (status)) { |
| /* We can't call _cairo_scaled_font_destroy here since it expects |
| * that the font has already been successfully inserted into the |
| * hash table. */ |
| _cairo_scaled_font_fini_internal (scaled_font); |
| free (scaled_font); |
| return _cairo_scaled_font_create_in_error (status); |
| } |
| |
| return scaled_font; |
| } |
| slim_hidden_def (cairo_scaled_font_create); |
| |
| static cairo_scaled_font_t *_cairo_scaled_font_nil_objects[CAIRO_STATUS_LAST_STATUS + 1]; |
| |
| /* XXX This should disappear in favour of a common pool of error objects. */ |
| cairo_scaled_font_t * |
| _cairo_scaled_font_create_in_error (cairo_status_t status) |
| { |
| cairo_scaled_font_t *scaled_font; |
| |
| assert (status != CAIRO_STATUS_SUCCESS); |
| |
| if (status == CAIRO_STATUS_NO_MEMORY) |
| return (cairo_scaled_font_t *) &_cairo_scaled_font_nil; |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_error_mutex); |
| scaled_font = _cairo_scaled_font_nil_objects[status]; |
| if (unlikely (scaled_font == NULL)) { |
| scaled_font = malloc (sizeof (cairo_scaled_font_t)); |
| if (unlikely (scaled_font == NULL)) { |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_error_mutex); |
| _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); |
| return (cairo_scaled_font_t *) &_cairo_scaled_font_nil; |
| } |
| |
| *scaled_font = _cairo_scaled_font_nil; |
| scaled_font->status = status; |
| _cairo_scaled_font_nil_objects[status] = scaled_font; |
| } |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_error_mutex); |
| |
| return scaled_font; |
| } |
| |
| void |
| _cairo_scaled_font_reset_static_data (void) |
| { |
| int status; |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_font_error_mutex); |
| for (status = CAIRO_STATUS_SUCCESS; |
| status <= CAIRO_STATUS_LAST_STATUS; |
| status++) |
| { |
| if (_cairo_scaled_font_nil_objects[status] != NULL) { |
| free (_cairo_scaled_font_nil_objects[status]); |
| _cairo_scaled_font_nil_objects[status] = NULL; |
| } |
| } |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_font_error_mutex); |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_glyph_page_cache_mutex); |
| if (cairo_scaled_glyph_page_cache.hash_table != NULL) { |
| _cairo_cache_fini (&cairo_scaled_glyph_page_cache); |
| cairo_scaled_glyph_page_cache.hash_table = NULL; |
| } |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_glyph_page_cache_mutex); |
| } |
| |
| /** |
| * cairo_scaled_font_reference: |
| * @scaled_font: a #cairo_scaled_font_t, (may be %NULL in which case |
| * this function does nothing) |
| * |
| * Increases the reference count on @scaled_font by one. This prevents |
| * @scaled_font from being destroyed until a matching call to |
| * cairo_scaled_font_destroy() is made. |
| * |
| * The number of references to a #cairo_scaled_font_t can be get using |
| * cairo_scaled_font_get_reference_count(). |
| * |
| * Returns: the referenced #cairo_scaled_font_t |
| **/ |
| cairo_scaled_font_t * |
| cairo_scaled_font_reference (cairo_scaled_font_t *scaled_font) |
| { |
| if (scaled_font == NULL || |
| CAIRO_REFERENCE_COUNT_IS_INVALID (&scaled_font->ref_count)) |
| return scaled_font; |
| |
| assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&scaled_font->ref_count)); |
| |
| _cairo_reference_count_inc (&scaled_font->ref_count); |
| |
| return scaled_font; |
| } |
| slim_hidden_def (cairo_scaled_font_reference); |
| |
| /** |
| * cairo_scaled_font_destroy: |
| * @scaled_font: a #cairo_scaled_font_t |
| * |
| * Decreases the reference count on @font by one. If the result |
| * is zero, then @font and all associated resources are freed. |
| * See cairo_scaled_font_reference(). |
| **/ |
| void |
| cairo_scaled_font_destroy (cairo_scaled_font_t *scaled_font) |
| { |
| cairo_scaled_font_t *lru = NULL; |
| cairo_scaled_font_map_t *font_map; |
| |
| assert (CAIRO_MUTEX_IS_UNLOCKED (_cairo_scaled_font_map_mutex)); |
| |
| if (scaled_font == NULL || |
| CAIRO_REFERENCE_COUNT_IS_INVALID (&scaled_font->ref_count)) |
| return; |
| |
| assert (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&scaled_font->ref_count)); |
| |
| if (! _cairo_reference_count_dec_and_test (&scaled_font->ref_count)) |
| return; |
| |
| font_map = _cairo_scaled_font_map_lock (); |
| assert (font_map != NULL); |
| |
| /* Another thread may have resurrected the font whilst we waited */ |
| if (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&scaled_font->ref_count)) { |
| if (! scaled_font->placeholder && |
| scaled_font->hash_entry.hash != ZOMBIE) |
| { |
| /* Another thread may have already inserted us into the holdovers */ |
| if (scaled_font->holdover) |
| goto unlock; |
| |
| /* Rather than immediately destroying this object, we put it into |
| * the font_map->holdovers array in case it will get used again |
| * soon (and is why we must hold the lock over the atomic op on |
| * the reference count). To make room for it, we do actually |
| * destroy the least-recently-used holdover. |
| */ |
| |
| if (font_map->num_holdovers == CAIRO_SCALED_FONT_MAX_HOLDOVERS) { |
| lru = font_map->holdovers[0]; |
| assert (! CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&lru->ref_count)); |
| |
| _cairo_hash_table_remove (font_map->hash_table, |
| &lru->hash_entry); |
| |
| font_map->num_holdovers--; |
| memmove (&font_map->holdovers[0], |
| &font_map->holdovers[1], |
| font_map->num_holdovers * sizeof (cairo_scaled_font_t*)); |
| } |
| |
| font_map->holdovers[font_map->num_holdovers++] = scaled_font; |
| scaled_font->holdover = TRUE; |
| } else |
| lru = scaled_font; |
| } |
| |
| unlock: |
| _cairo_scaled_font_map_unlock (); |
| |
| /* If we pulled an item from the holdovers array, (while the font |
| * map lock was held, of course), then there is no way that anyone |
| * else could have acquired a reference to it. So we can now |
| * safely call fini on it without any lock held. This is desirable |
| * as we never want to call into any backend function with a lock |
| * held. */ |
| if (lru != NULL) { |
| _cairo_scaled_font_fini_internal (lru); |
| free (lru); |
| } |
| } |
| slim_hidden_def (cairo_scaled_font_destroy); |
| |
| /** |
| * cairo_scaled_font_get_reference_count: |
| * @scaled_font: a #cairo_scaled_font_t |
| * |
| * Returns the current reference count of @scaled_font. |
| * |
| * Return value: the current reference count of @scaled_font. If the |
| * object is a nil object, 0 will be returned. |
| * |
| * Since: 1.4 |
| **/ |
| unsigned int |
| cairo_scaled_font_get_reference_count (cairo_scaled_font_t *scaled_font) |
| { |
| if (scaled_font == NULL || |
| CAIRO_REFERENCE_COUNT_IS_INVALID (&scaled_font->ref_count)) |
| return 0; |
| |
| return CAIRO_REFERENCE_COUNT_GET_VALUE (&scaled_font->ref_count); |
| } |
| |
| /** |
| * cairo_scaled_font_get_user_data: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @key: the address of the #cairo_user_data_key_t the user data was |
| * attached to |
| * |
| * Return user data previously attached to @scaled_font using the |
| * specified key. If no user data has been attached with the given |
| * key this function returns %NULL. |
| * |
| * Return value: the user data previously attached or %NULL. |
| * |
| * Since: 1.4 |
| **/ |
| void * |
| cairo_scaled_font_get_user_data (cairo_scaled_font_t *scaled_font, |
| const cairo_user_data_key_t *key) |
| { |
| return _cairo_user_data_array_get_data (&scaled_font->user_data, |
| key); |
| } |
| slim_hidden_def (cairo_scaled_font_get_user_data); |
| |
| /** |
| * cairo_scaled_font_set_user_data: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @key: the address of a #cairo_user_data_key_t to attach the user data to |
| * @user_data: the user data to attach to the #cairo_scaled_font_t |
| * @destroy: a #cairo_destroy_func_t which will be called when the |
| * #cairo_t is destroyed or when new user data is attached using the |
| * same key. |
| * |
| * Attach user data to @scaled_font. To remove user data from a surface, |
| * call this function with the key that was used to set it and %NULL |
| * for @data. |
| * |
| * Return value: %CAIRO_STATUS_SUCCESS or %CAIRO_STATUS_NO_MEMORY if a |
| * slot could not be allocated for the user data. |
| * |
| * Since: 1.4 |
| **/ |
| cairo_status_t |
| cairo_scaled_font_set_user_data (cairo_scaled_font_t *scaled_font, |
| const cairo_user_data_key_t *key, |
| void *user_data, |
| cairo_destroy_func_t destroy) |
| { |
| if (CAIRO_REFERENCE_COUNT_IS_INVALID (&scaled_font->ref_count)) |
| return scaled_font->status; |
| |
| return _cairo_user_data_array_set_data (&scaled_font->user_data, |
| key, user_data, destroy); |
| } |
| slim_hidden_def (cairo_scaled_font_set_user_data); |
| |
| /* Public font API follows. */ |
| |
| /** |
| * cairo_scaled_font_extents: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @extents: a #cairo_font_extents_t which to store the retrieved extents. |
| * |
| * Gets the metrics for a #cairo_scaled_font_t. |
| **/ |
| void |
| cairo_scaled_font_extents (cairo_scaled_font_t *scaled_font, |
| cairo_font_extents_t *extents) |
| { |
| if (scaled_font->status) { |
| extents->ascent = 0.0; |
| extents->descent = 0.0; |
| extents->height = 0.0; |
| extents->max_x_advance = 0.0; |
| extents->max_y_advance = 0.0; |
| return; |
| } |
| |
| *extents = scaled_font->extents; |
| } |
| slim_hidden_def (cairo_scaled_font_extents); |
| |
| /** |
| * cairo_scaled_font_text_extents: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @utf8: a NUL-terminated string of text, encoded in UTF-8 |
| * @extents: a #cairo_text_extents_t which to store the retrieved extents. |
| * |
| * Gets the extents for a string of text. The extents describe a |
| * user-space rectangle that encloses the "inked" portion of the text |
| * drawn at the origin (0,0) (as it would be drawn by cairo_show_text() |
| * if the cairo graphics state were set to the same font_face, |
| * font_matrix, ctm, and font_options as @scaled_font). Additionally, |
| * the x_advance and y_advance values indicate the amount by which the |
| * current point would be advanced by cairo_show_text(). |
| * |
| * Note that whitespace characters do not directly contribute to the |
| * size of the rectangle (extents.width and extents.height). They do |
| * contribute indirectly by changing the position of non-whitespace |
| * characters. In particular, trailing whitespace characters are |
| * likely to not affect the size of the rectangle, though they will |
| * affect the x_advance and y_advance values. |
| * |
| * Since: 1.2 |
| **/ |
| void |
| cairo_scaled_font_text_extents (cairo_scaled_font_t *scaled_font, |
| const char *utf8, |
| cairo_text_extents_t *extents) |
| { |
| cairo_status_t status; |
| cairo_glyph_t *glyphs = NULL; |
| int num_glyphs; |
| |
| if (scaled_font->status) |
| goto ZERO_EXTENTS; |
| |
| if (utf8 == NULL) |
| goto ZERO_EXTENTS; |
| |
| status = cairo_scaled_font_text_to_glyphs (scaled_font, 0., 0., |
| utf8, -1, |
| &glyphs, &num_glyphs, |
| NULL, NULL, |
| NULL); |
| if (unlikely (status)) { |
| status = _cairo_scaled_font_set_error (scaled_font, status); |
| goto ZERO_EXTENTS; |
| } |
| |
| cairo_scaled_font_glyph_extents (scaled_font, glyphs, num_glyphs, extents); |
| free (glyphs); |
| |
| return; |
| |
| ZERO_EXTENTS: |
| extents->x_bearing = 0.0; |
| extents->y_bearing = 0.0; |
| extents->width = 0.0; |
| extents->height = 0.0; |
| extents->x_advance = 0.0; |
| extents->y_advance = 0.0; |
| } |
| |
| /** |
| * cairo_scaled_font_glyph_extents: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @glyphs: an array of glyph IDs with X and Y offsets. |
| * @num_glyphs: the number of glyphs in the @glyphs array |
| * @extents: a #cairo_text_extents_t which to store the retrieved extents. |
| * |
| * Gets the extents for an array of glyphs. The extents describe a |
| * user-space rectangle that encloses the "inked" portion of the |
| * glyphs, (as they would be drawn by cairo_show_glyphs() if the cairo |
| * graphics state were set to the same font_face, font_matrix, ctm, |
| * and font_options as @scaled_font). Additionally, the x_advance and |
| * y_advance values indicate the amount by which the current point |
| * would be advanced by cairo_show_glyphs(). |
| * |
| * Note that whitespace glyphs do not contribute to the size of the |
| * rectangle (extents.width and extents.height). |
| **/ |
| void |
| cairo_scaled_font_glyph_extents (cairo_scaled_font_t *scaled_font, |
| const cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_text_extents_t *extents) |
| { |
| cairo_status_t status; |
| int i; |
| double min_x = 0.0, min_y = 0.0, max_x = 0.0, max_y = 0.0; |
| cairo_bool_t visible = FALSE; |
| cairo_scaled_glyph_t *scaled_glyph = NULL; |
| |
| extents->x_bearing = 0.0; |
| extents->y_bearing = 0.0; |
| extents->width = 0.0; |
| extents->height = 0.0; |
| extents->x_advance = 0.0; |
| extents->y_advance = 0.0; |
| |
| if (unlikely (scaled_font->status)) |
| goto ZERO_EXTENTS; |
| |
| if (num_glyphs == 0) |
| goto ZERO_EXTENTS; |
| |
| if (unlikely (num_glyphs < 0)) { |
| _cairo_error_throw (CAIRO_STATUS_NEGATIVE_COUNT); |
| /* XXX Can't propagate error */ |
| goto ZERO_EXTENTS; |
| } |
| |
| if (unlikely (glyphs == NULL)) { |
| _cairo_error_throw (CAIRO_STATUS_NULL_POINTER); |
| /* XXX Can't propagate error */ |
| goto ZERO_EXTENTS; |
| } |
| |
| _cairo_scaled_font_freeze_cache (scaled_font); |
| |
| for (i = 0; i < num_glyphs; i++) { |
| double left, top, right, bottom; |
| |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| glyphs[i].index, |
| CAIRO_SCALED_GLYPH_INFO_METRICS, |
| &scaled_glyph); |
| if (unlikely (status)) { |
| status = _cairo_scaled_font_set_error (scaled_font, status); |
| goto UNLOCK; |
| } |
| |
| /* "Ink" extents should skip "invisible" glyphs */ |
| if (scaled_glyph->metrics.width == 0 || scaled_glyph->metrics.height == 0) |
| continue; |
| |
| left = scaled_glyph->metrics.x_bearing + glyphs[i].x; |
| right = left + scaled_glyph->metrics.width; |
| top = scaled_glyph->metrics.y_bearing + glyphs[i].y; |
| bottom = top + scaled_glyph->metrics.height; |
| |
| if (!visible) { |
| visible = TRUE; |
| min_x = left; |
| max_x = right; |
| min_y = top; |
| max_y = bottom; |
| } else { |
| if (left < min_x) min_x = left; |
| if (right > max_x) max_x = right; |
| if (top < min_y) min_y = top; |
| if (bottom > max_y) max_y = bottom; |
| } |
| } |
| |
| if (visible) { |
| extents->x_bearing = min_x - glyphs[0].x; |
| extents->y_bearing = min_y - glyphs[0].y; |
| extents->width = max_x - min_x; |
| extents->height = max_y - min_y; |
| } else { |
| extents->x_bearing = 0.0; |
| extents->y_bearing = 0.0; |
| extents->width = 0.0; |
| extents->height = 0.0; |
| } |
| |
| if (num_glyphs) { |
| double x0, y0, x1, y1; |
| |
| x0 = glyphs[0].x; |
| y0 = glyphs[0].y; |
| |
| /* scaled_glyph contains the glyph for num_glyphs - 1 already. */ |
| x1 = glyphs[num_glyphs - 1].x + scaled_glyph->metrics.x_advance; |
| y1 = glyphs[num_glyphs - 1].y + scaled_glyph->metrics.y_advance; |
| |
| extents->x_advance = x1 - x0; |
| extents->y_advance = y1 - y0; |
| } else { |
| extents->x_advance = 0.0; |
| extents->y_advance = 0.0; |
| } |
| |
| UNLOCK: |
| _cairo_scaled_font_thaw_cache (scaled_font); |
| return; |
| |
| ZERO_EXTENTS: |
| extents->x_bearing = 0.0; |
| extents->y_bearing = 0.0; |
| extents->width = 0.0; |
| extents->height = 0.0; |
| extents->x_advance = 0.0; |
| extents->y_advance = 0.0; |
| } |
| slim_hidden_def (cairo_scaled_font_glyph_extents); |
| |
| #define GLYPH_LUT_SIZE 64 |
| static cairo_status_t |
| cairo_scaled_font_text_to_glyphs_internal_cached (cairo_scaled_font_t *scaled_font, |
| double x, |
| double y, |
| const char *utf8, |
| cairo_glyph_t *glyphs, |
| cairo_text_cluster_t **clusters, |
| int num_chars) |
| { |
| struct glyph_lut_elt { |
| unsigned long index; |
| double x_advance; |
| double y_advance; |
| } glyph_lut[GLYPH_LUT_SIZE]; |
| uint32_t glyph_lut_unicode[GLYPH_LUT_SIZE]; |
| cairo_status_t status; |
| const char *p; |
| int i; |
| |
| for (i = 0; i < GLYPH_LUT_SIZE; i++) |
| glyph_lut_unicode[i] = ~0U; |
| |
| p = utf8; |
| for (i = 0; i < num_chars; i++) { |
| int idx, num_bytes; |
| uint32_t unicode; |
| cairo_scaled_glyph_t *scaled_glyph; |
| struct glyph_lut_elt *glyph_slot; |
| |
| num_bytes = _cairo_utf8_get_char_validated (p, &unicode); |
| p += num_bytes; |
| |
| glyphs[i].x = x; |
| glyphs[i].y = y; |
| |
| idx = unicode % ARRAY_LENGTH (glyph_lut); |
| glyph_slot = &glyph_lut[idx]; |
| if (glyph_lut_unicode[idx] == unicode) { |
| glyphs[i].index = glyph_slot->index; |
| x += glyph_slot->x_advance; |
| y += glyph_slot->y_advance; |
| } else { |
| unsigned long g; |
| |
| g = scaled_font->backend->ucs4_to_index (scaled_font, unicode); |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| g, |
| CAIRO_SCALED_GLYPH_INFO_METRICS, |
| &scaled_glyph); |
| if (unlikely (status)) |
| return status; |
| |
| x += scaled_glyph->metrics.x_advance; |
| y += scaled_glyph->metrics.y_advance; |
| |
| glyph_lut_unicode[idx] = unicode; |
| glyph_slot->index = g; |
| glyph_slot->x_advance = scaled_glyph->metrics.x_advance; |
| glyph_slot->y_advance = scaled_glyph->metrics.y_advance; |
| |
| glyphs[i].index = g; |
| } |
| |
| if (clusters) { |
| (*clusters)[i].num_bytes = num_bytes; |
| (*clusters)[i].num_glyphs = 1; |
| } |
| } |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| static cairo_status_t |
| cairo_scaled_font_text_to_glyphs_internal_uncached (cairo_scaled_font_t *scaled_font, |
| double x, |
| double y, |
| const char *utf8, |
| cairo_glyph_t *glyphs, |
| cairo_text_cluster_t **clusters, |
| int num_chars) |
| { |
| const char *p; |
| int i; |
| |
| p = utf8; |
| for (i = 0; i < num_chars; i++) { |
| unsigned long g; |
| int num_bytes; |
| uint32_t unicode; |
| cairo_scaled_glyph_t *scaled_glyph; |
| cairo_status_t status; |
| |
| num_bytes = _cairo_utf8_get_char_validated (p, &unicode); |
| p += num_bytes; |
| |
| glyphs[i].x = x; |
| glyphs[i].y = y; |
| |
| g = scaled_font->backend->ucs4_to_index (scaled_font, unicode); |
| |
| /* |
| * No advance needed for a single character string. So, let's speed up |
| * one-character strings by skipping glyph lookup. |
| */ |
| if (num_chars > 1) { |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| g, |
| CAIRO_SCALED_GLYPH_INFO_METRICS, |
| &scaled_glyph); |
| if (unlikely (status)) |
| return status; |
| |
| x += scaled_glyph->metrics.x_advance; |
| y += scaled_glyph->metrics.y_advance; |
| } |
| |
| glyphs[i].index = g; |
| |
| if (clusters) { |
| (*clusters)[i].num_bytes = num_bytes; |
| (*clusters)[i].num_glyphs = 1; |
| } |
| } |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| /** |
| * cairo_scaled_font_text_to_glyphs: |
| * @x: X position to place first glyph |
| * @y: Y position to place first glyph |
| * @scaled_font: a #cairo_scaled_font_t |
| * @utf8: a string of text encoded in UTF-8 |
| * @utf8_len: length of @utf8 in bytes, or -1 if it is NUL-terminated |
| * @glyphs: pointer to array of glyphs to fill |
| * @num_glyphs: pointer to number of glyphs |
| * @clusters: pointer to array of cluster mapping information to fill, or %NULL |
| * @num_clusters: pointer to number of clusters, or %NULL |
| * @cluster_flags: pointer to location to store cluster flags corresponding to the |
| * output @clusters, or %NULL |
| * |
| * Converts UTF-8 text to an array of glyphs, optionally with cluster |
| * mapping, that can be used to render later using @scaled_font. |
| * |
| * If @glyphs initially points to a non-%NULL value, that array is used |
| * as a glyph buffer, and @num_glyphs should point to the number of glyph |
| * entries available there. If the provided glyph array is too short for |
| * the conversion, a new glyph array is allocated using cairo_glyph_allocate() |
| * and placed in @glyphs. Upon return, @num_glyphs always contains the |
| * number of generated glyphs. If the value @glyphs points to has changed |
| * after the call, the user is responsible for freeing the allocated glyph |
| * array using cairo_glyph_free(). This may happen even if the provided |
| * array was large enough. |
| * |
| * If @clusters is not %NULL, @num_clusters and @cluster_flags should not be %NULL, |
| * and cluster mapping will be computed. |
| * The semantics of how cluster array allocation works is similar to the glyph |
| * array. That is, |
| * if @clusters initially points to a non-%NULL value, that array is used |
| * as a cluster buffer, and @num_clusters should point to the number of cluster |
| * entries available there. If the provided cluster array is too short for |
| * the conversion, a new cluster array is allocated using cairo_text_cluster_allocate() |
| * and placed in @clusters. Upon return, @num_clusters always contains the |
| * number of generated clusters. If the value @clusters points at has changed |
| * after the call, the user is responsible for freeing the allocated cluster |
| * array using cairo_text_cluster_free(). This may happen even if the provided |
| * array was large enough. |
| * |
| * In the simplest case, @glyphs and @clusters can point to %NULL initially |
| * and a suitable array will be allocated. In code: |
| * <informalexample><programlisting> |
| * cairo_status_t status; |
| * |
| * cairo_glyph_t *glyphs = NULL; |
| * int num_glyphs; |
| * cairo_text_cluster_t *clusters = NULL; |
| * int num_clusters; |
| * cairo_text_cluster_flags_t cluster_flags; |
| * |
| * status = cairo_scaled_font_text_to_glyphs (scaled_font, |
| * x, y, |
| * utf8, utf8_len, |
| * &glyphs, &num_glyphs, |
| * &clusters, &num_clusters, &cluster_flags); |
| * |
| * if (status == CAIRO_STATUS_SUCCESS) { |
| * cairo_show_text_glyphs (cr, |
| * utf8, utf8_len, |
| * glyphs, num_glyphs, |
| * clusters, num_clusters, cluster_flags); |
| * |
| * cairo_glyph_free (glyphs); |
| * cairo_text_cluster_free (clusters); |
| * } |
| * </programlisting></informalexample> |
| * |
| * If no cluster mapping is needed: |
| * <informalexample><programlisting> |
| * cairo_status_t status; |
| * |
| * cairo_glyph_t *glyphs = NULL; |
| * int num_glyphs; |
| * |
| * status = cairo_scaled_font_text_to_glyphs (scaled_font, |
| * x, y, |
| * utf8, utf8_len, |
| * &glyphs, &num_glyphs, |
| * NULL, NULL, |
| * NULL); |
| * |
| * if (status == CAIRO_STATUS_SUCCESS) { |
| * cairo_show_glyphs (cr, glyphs, num_glyphs); |
| * cairo_glyph_free (glyphs); |
| * } |
| * </programlisting></informalexample> |
| * |
| * If stack-based glyph and cluster arrays are to be used for small |
| * arrays: |
| * <informalexample><programlisting> |
| * cairo_status_t status; |
| * |
| * cairo_glyph_t stack_glyphs[40]; |
| * cairo_glyph_t *glyphs = stack_glyphs; |
| * int num_glyphs = sizeof (stack_glyphs) / sizeof (stack_glyphs[0]); |
| * cairo_text_cluster_t stack_clusters[40]; |
| * cairo_text_cluster_t *clusters = stack_clusters; |
| * int num_clusters = sizeof (stack_clusters) / sizeof (stack_clusters[0]); |
| * cairo_text_cluster_flags_t cluster_flags; |
| * |
| * status = cairo_scaled_font_text_to_glyphs (scaled_font, |
| * x, y, |
| * utf8, utf8_len, |
| * &glyphs, &num_glyphs, |
| * &clusters, &num_clusters, &cluster_flags); |
| * |
| * if (status == CAIRO_STATUS_SUCCESS) { |
| * cairo_show_text_glyphs (cr, |
| * utf8, utf8_len, |
| * glyphs, num_glyphs, |
| * clusters, num_clusters, cluster_flags); |
| * |
| * if (glyphs != stack_glyphs) |
| * cairo_glyph_free (glyphs); |
| * if (clusters != stack_clusters) |
| * cairo_text_cluster_free (clusters); |
| * } |
| * </programlisting></informalexample> |
| * |
| * For details of how @clusters, @num_clusters, and @cluster_flags map input |
| * UTF-8 text to the output glyphs see cairo_show_text_glyphs(). |
| * |
| * The output values can be readily passed to cairo_show_text_glyphs() |
| * cairo_show_glyphs(), or related functions, assuming that the exact |
| * same @scaled_font is used for the operation. |
| * |
| * Return value: %CAIRO_STATUS_SUCCESS upon success, or an error status |
| * if the input values are wrong or if conversion failed. If the input |
| * values are correct but the conversion failed, the error status is also |
| * set on @scaled_font. |
| * |
| * Since: 1.8 |
| **/ |
| #define CACHING_THRESHOLD 16 |
| cairo_status_t |
| cairo_scaled_font_text_to_glyphs (cairo_scaled_font_t *scaled_font, |
| double x, |
| double y, |
| const char *utf8, |
| int utf8_len, |
| cairo_glyph_t **glyphs, |
| int *num_glyphs, |
| cairo_text_cluster_t **clusters, |
| int *num_clusters, |
| cairo_text_cluster_flags_t *cluster_flags) |
| { |
| int num_chars = 0; |
| cairo_status_t status; |
| cairo_glyph_t *orig_glyphs; |
| cairo_text_cluster_t *orig_clusters; |
| |
| status = scaled_font->status; |
| if (unlikely (status)) |
| return status; |
| |
| /* A slew of sanity checks */ |
| |
| /* glyphs and num_glyphs can't be NULL */ |
| if (glyphs == NULL || |
| num_glyphs == NULL) { |
| status = _cairo_error (CAIRO_STATUS_NULL_POINTER); |
| goto BAIL; |
| } |
| |
| /* Special case for NULL and -1 */ |
| if (utf8 == NULL && utf8_len == -1) |
| utf8_len = 0; |
| |
| /* No NULLs for non-NULLs! */ |
| if ((utf8_len && utf8 == NULL) || |
| (clusters && num_clusters == NULL) || |
| (clusters && cluster_flags == NULL)) { |
| status = _cairo_error (CAIRO_STATUS_NULL_POINTER); |
| goto BAIL; |
| } |
| |
| /* A -1 for utf8_len means NUL-terminated */ |
| if (utf8_len == -1) |
| utf8_len = strlen (utf8); |
| |
| /* A NULL *glyphs means no prealloced glyphs array */ |
| if (glyphs && *glyphs == NULL) |
| *num_glyphs = 0; |
| |
| /* A NULL *clusters means no prealloced clusters array */ |
| if (clusters && *clusters == NULL) |
| *num_clusters = 0; |
| |
| if (!clusters && num_clusters) { |
| num_clusters = NULL; |
| } |
| |
| if (cluster_flags) { |
| *cluster_flags = FALSE; |
| } |
| |
| if (!clusters && cluster_flags) { |
| cluster_flags = NULL; |
| } |
| |
| /* Apart from that, no negatives */ |
| if (utf8_len < 0 || |
| *num_glyphs < 0 || |
| (num_clusters && *num_clusters < 0)) { |
| status = _cairo_error (CAIRO_STATUS_NEGATIVE_COUNT); |
| goto BAIL; |
| } |
| |
| if (utf8_len == 0) { |
| status = CAIRO_STATUS_SUCCESS; |
| goto BAIL; |
| } |
| |
| /* validate input so backend does not have to */ |
| status = _cairo_utf8_to_ucs4 (utf8, utf8_len, NULL, &num_chars); |
| if (unlikely (status)) |
| goto BAIL; |
| |
| _cairo_scaled_font_freeze_cache (scaled_font); |
| |
| orig_glyphs = *glyphs; |
| orig_clusters = clusters ? *clusters : NULL; |
| |
| if (scaled_font->backend->text_to_glyphs) { |
| status = scaled_font->backend->text_to_glyphs (scaled_font, x, y, |
| utf8, utf8_len, |
| glyphs, num_glyphs, |
| clusters, num_clusters, |
| cluster_flags); |
| if (status != CAIRO_INT_STATUS_UNSUPPORTED) { |
| if (status == CAIRO_STATUS_SUCCESS) { |
| /* The checks here are crude; we only should do them in |
| * user-font backend, but they don't hurt here. This stuff |
| * can be hard to get right. */ |
| |
| if (*num_glyphs < 0) { |
| status = _cairo_error (CAIRO_STATUS_NEGATIVE_COUNT); |
| goto DONE; |
| } |
| if (num_glyphs && *glyphs == NULL) { |
| status = _cairo_error (CAIRO_STATUS_NULL_POINTER); |
| goto DONE; |
| } |
| |
| if (clusters) { |
| if (*num_clusters < 0) { |
| status = _cairo_error (CAIRO_STATUS_NEGATIVE_COUNT); |
| goto DONE; |
| } |
| if (num_clusters && *clusters == NULL) { |
| status = _cairo_error (CAIRO_STATUS_NULL_POINTER); |
| goto DONE; |
| } |
| |
| /* Don't trust the backend, validate clusters! */ |
| status = |
| _cairo_validate_text_clusters (utf8, utf8_len, |
| *glyphs, *num_glyphs, |
| *clusters, *num_clusters, |
| *cluster_flags); |
| } |
| } |
| |
| goto DONE; |
| } |
| } |
| |
| if (*num_glyphs < num_chars) { |
| *glyphs = cairo_glyph_allocate (num_chars); |
| if (unlikely (*glyphs == NULL)) { |
| status = _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| goto DONE; |
| } |
| } |
| *num_glyphs = num_chars; |
| |
| if (clusters) { |
| if (*num_clusters < num_chars) { |
| *clusters = cairo_text_cluster_allocate (num_chars); |
| if (unlikely (*clusters == NULL)) { |
| status = _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| goto DONE; |
| } |
| } |
| *num_clusters = num_chars; |
| } |
| |
| if (num_chars > CACHING_THRESHOLD) |
| status = cairo_scaled_font_text_to_glyphs_internal_cached (scaled_font, |
| x, y, |
| utf8, |
| *glyphs, |
| clusters, |
| num_chars); |
| else |
| status = cairo_scaled_font_text_to_glyphs_internal_uncached (scaled_font, |
| x, y, |
| utf8, |
| *glyphs, |
| clusters, |
| num_chars); |
| |
| DONE: /* error that should be logged on scaled_font happened */ |
| _cairo_scaled_font_thaw_cache (scaled_font); |
| |
| if (unlikely (status)) { |
| *num_glyphs = 0; |
| if (*glyphs != orig_glyphs) { |
| cairo_glyph_free (*glyphs); |
| *glyphs = orig_glyphs; |
| } |
| |
| if (clusters) { |
| *num_clusters = 0; |
| if (*clusters != orig_clusters) { |
| cairo_text_cluster_free (*clusters); |
| *clusters = orig_clusters; |
| } |
| } |
| } |
| |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| |
| BAIL: /* error with input arguments */ |
| |
| if (num_glyphs) |
| *num_glyphs = 0; |
| |
| if (num_clusters) |
| *num_clusters = 0; |
| |
| return status; |
| } |
| slim_hidden_def (cairo_scaled_font_text_to_glyphs); |
| |
| static inline cairo_bool_t |
| _range_contains_glyph (const cairo_box_t *extents, |
| cairo_fixed_t left, |
| cairo_fixed_t top, |
| cairo_fixed_t right, |
| cairo_fixed_t bottom) |
| { |
| return right > extents->p1.x && |
| left < extents->p2.x && |
| bottom > extents->p1.y && |
| top < extents->p2.y; |
| } |
| |
| /* |
| * Compute a device-space bounding box for the glyphs. |
| */ |
| cairo_status_t |
| _cairo_scaled_font_glyph_device_extents (cairo_scaled_font_t *scaled_font, |
| const cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_rectangle_int_t *extents, |
| cairo_bool_t *overlap_out) |
| { |
| cairo_status_t status = CAIRO_STATUS_SUCCESS; |
| cairo_box_t box = { { INT_MAX, INT_MAX }, { INT_MIN, INT_MIN }}; |
| cairo_scaled_glyph_t *glyph_cache[64]; |
| cairo_bool_t overlap = overlap_out ? FALSE : TRUE; |
| cairo_round_glyph_positions_t round_glyph_positions = _cairo_font_options_get_round_glyph_positions (&scaled_font->options); |
| int i; |
| |
| if (unlikely (scaled_font->status)) |
| return scaled_font->status; |
| |
| _cairo_scaled_font_freeze_cache (scaled_font); |
| |
| memset (glyph_cache, 0, sizeof (glyph_cache)); |
| |
| for (i = 0; i < num_glyphs; i++) { |
| cairo_scaled_glyph_t *scaled_glyph; |
| cairo_fixed_t x, y, x1, y1, x2, y2; |
| int cache_index = glyphs[i].index % ARRAY_LENGTH (glyph_cache); |
| |
| scaled_glyph = glyph_cache[cache_index]; |
| if (scaled_glyph == NULL || |
| _cairo_scaled_glyph_index (scaled_glyph) != glyphs[i].index) |
| { |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| glyphs[i].index, |
| CAIRO_SCALED_GLYPH_INFO_METRICS, |
| &scaled_glyph); |
| if (unlikely (status)) |
| break; |
| |
| glyph_cache[cache_index] = scaled_glyph; |
| } |
| |
| if (round_glyph_positions == CAIRO_ROUND_GLYPH_POS_ON) |
| x = _cairo_fixed_from_double (_cairo_lround (glyphs[i].x)); |
| else |
| x = _cairo_fixed_from_double (glyphs[i].x); |
| x1 = x + scaled_glyph->bbox.p1.x; |
| x2 = x + scaled_glyph->bbox.p2.x; |
| |
| if (round_glyph_positions == CAIRO_ROUND_GLYPH_POS_ON) |
| y = _cairo_fixed_from_double (_cairo_lround (glyphs[i].y)); |
| else |
| y = _cairo_fixed_from_double (glyphs[i].y); |
| y1 = y + scaled_glyph->bbox.p1.y; |
| y2 = y + scaled_glyph->bbox.p2.y; |
| |
| if (overlap == FALSE) |
| overlap = _range_contains_glyph (&box, x1, y1, x2, y2); |
| |
| if (x1 < box.p1.x) box.p1.x = x1; |
| if (x2 > box.p2.x) box.p2.x = x2; |
| if (y1 < box.p1.y) box.p1.y = y1; |
| if (y2 > box.p2.y) box.p2.y = y2; |
| } |
| |
| _cairo_scaled_font_thaw_cache (scaled_font); |
| if (unlikely (status)) |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| |
| if (box.p1.x < box.p2.x) { |
| _cairo_box_round_to_rectangle (&box, extents); |
| } else { |
| extents->x = extents->y = 0; |
| extents->width = extents->height = 0; |
| } |
| |
| if (overlap_out != NULL) |
| *overlap_out = overlap; |
| |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| void |
| _cairo_scaled_font_glyph_approximate_extents (cairo_scaled_font_t *scaled_font, |
| const cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_rectangle_int_t *extents) |
| { |
| double x0 = HUGE_VAL, x1 = -HUGE_VAL; |
| double y0 = HUGE_VAL, y1 = -HUGE_VAL; |
| int i; |
| |
| for (i = 0; i < num_glyphs; i++) { |
| double g; |
| |
| g = glyphs[i].x; |
| if (g < x0) x0 = g; |
| if (g > x1) x1 = g; |
| |
| g = glyphs[i].y; |
| if (g < y0) y0 = g; |
| if (g > y1) y1 = g; |
| } |
| |
| if (x0 <= x1 && y0 <= y1) { |
| extents->x = floor (x0 - scaled_font->extents.max_x_advance); |
| extents->width = ceil (x1 + scaled_font->extents.max_x_advance); |
| extents->width -= extents->x; |
| |
| extents->y = floor (y0 - scaled_font->extents.ascent); |
| extents->height = ceil (y1 + scaled_font->extents.descent); |
| extents->height -= extents->y; |
| } else { |
| extents->x = extents->y = 0; |
| extents->width = extents->height = 0; |
| } |
| } |
| |
| cairo_status_t |
| _cairo_scaled_font_show_glyphs (cairo_scaled_font_t *scaled_font, |
| cairo_operator_t op, |
| const cairo_pattern_t *pattern, |
| cairo_surface_t *surface, |
| int source_x, |
| int source_y, |
| int dest_x, |
| int dest_y, |
| unsigned int width, |
| unsigned int height, |
| cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_region_t *clip_region) |
| { |
| cairo_status_t status; |
| cairo_surface_t *mask = NULL; |
| cairo_format_t mask_format = CAIRO_FORMAT_A1; /* shut gcc up */ |
| cairo_surface_pattern_t mask_pattern; |
| int i; |
| |
| /* These operators aren't interpreted the same way by the backends; |
| * they are implemented in terms of other operators in cairo-gstate.c |
| */ |
| assert (op != CAIRO_OPERATOR_SOURCE && op != CAIRO_OPERATOR_CLEAR); |
| |
| if (scaled_font->status) |
| return scaled_font->status; |
| |
| if (!num_glyphs) |
| return CAIRO_STATUS_SUCCESS; |
| |
| if (scaled_font->backend->show_glyphs != NULL) { |
| int remaining_glyphs = num_glyphs; |
| status = scaled_font->backend->show_glyphs (scaled_font, |
| op, pattern, |
| surface, |
| source_x, source_y, |
| dest_x, dest_y, |
| width, height, |
| glyphs, num_glyphs, |
| clip_region, |
| &remaining_glyphs); |
| glyphs += num_glyphs - remaining_glyphs; |
| num_glyphs = remaining_glyphs; |
| if (remaining_glyphs == 0) |
| status = CAIRO_STATUS_SUCCESS; |
| if (status != CAIRO_INT_STATUS_UNSUPPORTED) |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| } |
| |
| /* Font display routine either does not exist or failed. */ |
| |
| _cairo_scaled_font_freeze_cache (scaled_font); |
| |
| for (i = 0; i < num_glyphs; i++) { |
| int x, y; |
| cairo_image_surface_t *glyph_surface; |
| cairo_scaled_glyph_t *scaled_glyph; |
| |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| glyphs[i].index, |
| CAIRO_SCALED_GLYPH_INFO_SURFACE, |
| &scaled_glyph); |
| |
| if (unlikely (status)) |
| goto CLEANUP_MASK; |
| |
| glyph_surface = scaled_glyph->surface; |
| |
| /* To start, create the mask using the format from the first |
| * glyph. Later we'll deal with different formats. */ |
| if (mask == NULL) { |
| mask_format = glyph_surface->format; |
| mask = cairo_image_surface_create (mask_format, width, height); |
| status = mask->status; |
| if (unlikely (status)) |
| goto CLEANUP_MASK; |
| } |
| |
| /* If we have glyphs of different formats, we "upgrade" the mask |
| * to the wider of the formats. */ |
| if (glyph_surface->format != mask_format && |
| _cairo_format_bits_per_pixel (mask_format) < |
| _cairo_format_bits_per_pixel (glyph_surface->format) ) |
| { |
| cairo_surface_t *new_mask; |
| |
| switch (glyph_surface->format) { |
| case CAIRO_FORMAT_ARGB32: |
| case CAIRO_FORMAT_A8: |
| case CAIRO_FORMAT_A1: |
| mask_format = glyph_surface->format; |
| break; |
| case CAIRO_FORMAT_RGB16_565: |
| case CAIRO_FORMAT_RGB24: |
| case CAIRO_FORMAT_INVALID: |
| default: |
| ASSERT_NOT_REACHED; |
| mask_format = CAIRO_FORMAT_ARGB32; |
| break; |
| } |
| |
| new_mask = cairo_image_surface_create (mask_format, width, height); |
| status = new_mask->status; |
| if (unlikely (status)) { |
| cairo_surface_destroy (new_mask); |
| goto CLEANUP_MASK; |
| } |
| |
| _cairo_pattern_init_for_surface (&mask_pattern, mask); |
| /* Note that we only upgrade masks, i.e. A1 -> A8 -> ARGB32, so there is |
| * never any component alpha here. |
| */ |
| status = _cairo_surface_composite (CAIRO_OPERATOR_ADD, |
| &_cairo_pattern_white.base, |
| &mask_pattern.base, |
| new_mask, |
| 0, 0, |
| 0, 0, |
| 0, 0, |
| width, height, |
| NULL); |
| |
| _cairo_pattern_fini (&mask_pattern.base); |
| |
| if (unlikely (status)) { |
| cairo_surface_destroy (new_mask); |
| goto CLEANUP_MASK; |
| } |
| |
| cairo_surface_destroy (mask); |
| mask = new_mask; |
| } |
| |
| if (glyph_surface->width && glyph_surface->height) { |
| cairo_surface_pattern_t glyph_pattern; |
| |
| /* round glyph locations to the nearest pixel */ |
| /* XXX: FRAGILE: We're ignoring device_transform scaling here. A bug? */ |
| x = _cairo_lround (glyphs[i].x - |
| glyph_surface->base.device_transform.x0); |
| y = _cairo_lround (glyphs[i].y - |
| glyph_surface->base.device_transform.y0); |
| |
| _cairo_pattern_init_for_surface (&glyph_pattern, |
| &glyph_surface->base); |
| if (mask_format == CAIRO_FORMAT_ARGB32) |
| glyph_pattern.base.has_component_alpha = TRUE; |
| |
| status = _cairo_surface_composite (CAIRO_OPERATOR_ADD, |
| &_cairo_pattern_white.base, |
| &glyph_pattern.base, |
| mask, |
| 0, 0, |
| 0, 0, |
| x - dest_x, y - dest_y, |
| glyph_surface->width, |
| glyph_surface->height, |
| NULL); |
| |
| _cairo_pattern_fini (&glyph_pattern.base); |
| |
| if (unlikely (status)) |
| goto CLEANUP_MASK; |
| } |
| } |
| |
| _cairo_pattern_init_for_surface (&mask_pattern, mask); |
| if (mask_format == CAIRO_FORMAT_ARGB32) |
| mask_pattern.base.has_component_alpha = TRUE; |
| |
| status = _cairo_surface_composite (op, pattern, &mask_pattern.base, |
| surface, |
| source_x, source_y, |
| 0, 0, |
| dest_x, dest_y, |
| width, height, |
| clip_region); |
| |
| _cairo_pattern_fini (&mask_pattern.base); |
| |
| CLEANUP_MASK: |
| _cairo_scaled_font_thaw_cache (scaled_font); |
| |
| if (mask != NULL) |
| cairo_surface_destroy (mask); |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| } |
| |
| /* Add a single-device-unit rectangle to a path. */ |
| static cairo_status_t |
| _add_unit_rectangle_to_path (cairo_path_fixed_t *path, |
| cairo_fixed_t x, |
| cairo_fixed_t y) |
| { |
| cairo_status_t status; |
| |
| status = _cairo_path_fixed_move_to (path, x, y); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_rel_line_to (path, |
| _cairo_fixed_from_int (1), |
| _cairo_fixed_from_int (0)); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_rel_line_to (path, |
| _cairo_fixed_from_int (0), |
| _cairo_fixed_from_int (1)); |
| if (unlikely (status)) |
| return status; |
| |
| status = _cairo_path_fixed_rel_line_to (path, |
| _cairo_fixed_from_int (-1), |
| _cairo_fixed_from_int (0)); |
| if (unlikely (status)) |
| return status; |
| |
| return _cairo_path_fixed_close_path (path); |
| } |
| |
| /** |
| * _trace_mask_to_path: |
| * @bitmap: An alpha mask (either %CAIRO_FORMAT_A1 or %CAIRO_FORMAT_A8) |
| * @path: An initialized path to hold the result |
| * |
| * Given a mask surface, (an alpha image), fill out the provided path |
| * so that when filled it would result in something that approximates |
| * the mask. |
| * |
| * Note: The current tracing code here is extremely primitive. It |
| * operates only on an A1 surface, (converting an A8 surface to A1 if |
| * necessary), and performs the tracing by drawing a little square |
| * around each pixel that is on in the mask. We do not pretend that |
| * this is a high-quality result. But we are leaving it up to someone |
| * who cares enough about getting a better result to implement |
| * something more sophisticated. |
| **/ |
| static cairo_status_t |
| _trace_mask_to_path (cairo_image_surface_t *mask, |
| cairo_path_fixed_t *path, |
| double tx, double ty) |
| { |
| const uint8_t *row; |
| int rows, cols, bytes_per_row; |
| int x, y, bit; |
| double xoff, yoff; |
| cairo_fixed_t x0, y0; |
| cairo_fixed_t px, py; |
| cairo_status_t status; |
| |
| mask = _cairo_image_surface_coerce_to_format (mask, CAIRO_FORMAT_A1); |
| status = mask->base.status; |
| if (unlikely (status)) |
| return status; |
| |
| cairo_surface_get_device_offset (&mask->base, &xoff, &yoff); |
| x0 = _cairo_fixed_from_double (tx - xoff); |
| y0 = _cairo_fixed_from_double (ty - yoff); |
| |
| bytes_per_row = (mask->width + 7) / 8; |
| row = mask->data; |
| for (y = 0, rows = mask->height; rows--; row += mask->stride, y++) { |
| const uint8_t *byte_ptr = row; |
| x = 0; |
| py = _cairo_fixed_from_int (y); |
| for (cols = bytes_per_row; cols--; ) { |
| uint8_t byte = *byte_ptr++; |
| if (byte == 0) { |
| x += 8; |
| continue; |
| } |
| |
| byte = CAIRO_BITSWAP8_IF_LITTLE_ENDIAN (byte); |
| for (bit = 1 << 7; bit && x < mask->width; bit >>= 1, x++) { |
| if (byte & bit) { |
| px = _cairo_fixed_from_int (x); |
| status = _add_unit_rectangle_to_path (path, |
| px + x0, |
| py + y0); |
| if (unlikely (status)) |
| goto BAIL; |
| } |
| } |
| } |
| } |
| |
| BAIL: |
| cairo_surface_destroy (&mask->base); |
| |
| return status; |
| } |
| |
| cairo_status_t |
| _cairo_scaled_font_glyph_path (cairo_scaled_font_t *scaled_font, |
| const cairo_glyph_t *glyphs, |
| int num_glyphs, |
| cairo_path_fixed_t *path) |
| { |
| cairo_status_t status; |
| int i; |
| |
| status = scaled_font->status; |
| if (unlikely (status)) |
| return status; |
| |
| _cairo_scaled_font_freeze_cache (scaled_font); |
| for (i = 0; i < num_glyphs; i++) { |
| cairo_scaled_glyph_t *scaled_glyph; |
| |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| glyphs[i].index, |
| CAIRO_SCALED_GLYPH_INFO_PATH, |
| &scaled_glyph); |
| if (status == CAIRO_STATUS_SUCCESS) { |
| status = _cairo_path_fixed_append (path, |
| scaled_glyph->path, |
| _cairo_fixed_from_double (glyphs[i].x), |
| _cairo_fixed_from_double (glyphs[i].y)); |
| |
| } else if (status == CAIRO_INT_STATUS_UNSUPPORTED) { |
| /* If the font is incapable of providing a path, then we'll |
| * have to trace our own from a surface. |
| */ |
| status = _cairo_scaled_glyph_lookup (scaled_font, |
| glyphs[i].index, |
| CAIRO_SCALED_GLYPH_INFO_SURFACE, |
| &scaled_glyph); |
| if (unlikely (status)) |
| goto BAIL; |
| |
| status = _trace_mask_to_path (scaled_glyph->surface, path, |
| glyphs[i].x, glyphs[i].y); |
| } |
| |
| if (unlikely (status)) |
| goto BAIL; |
| } |
| BAIL: |
| _cairo_scaled_font_thaw_cache (scaled_font); |
| |
| return _cairo_scaled_font_set_error (scaled_font, status); |
| } |
| |
| /** |
| * _cairo_scaled_glyph_set_metrics: |
| * @scaled_glyph: a #cairo_scaled_glyph_t |
| * @scaled_font: a #cairo_scaled_font_t |
| * @fs_metrics: a #cairo_text_extents_t in font space |
| * |
| * _cairo_scaled_glyph_set_metrics() stores user space metrics |
| * for the specified glyph given font space metrics. It is |
| * called by the font backend when initializing a glyph with |
| * %CAIRO_SCALED_GLYPH_INFO_METRICS. |
| **/ |
| void |
| _cairo_scaled_glyph_set_metrics (cairo_scaled_glyph_t *scaled_glyph, |
| cairo_scaled_font_t *scaled_font, |
| cairo_text_extents_t *fs_metrics) |
| { |
| cairo_bool_t first = TRUE; |
| double hm, wm; |
| double min_user_x = 0.0, max_user_x = 0.0, min_user_y = 0.0, max_user_y = 0.0; |
| double min_device_x = 0.0, max_device_x = 0.0, min_device_y = 0.0, max_device_y = 0.0; |
| double device_x_advance, device_y_advance; |
| |
| scaled_glyph->fs_metrics = *fs_metrics; |
| |
| for (hm = 0.0; hm <= 1.0; hm += 1.0) |
| for (wm = 0.0; wm <= 1.0; wm += 1.0) { |
| double x, y; |
| |
| /* Transform this corner to user space */ |
| x = fs_metrics->x_bearing + fs_metrics->width * wm; |
| y = fs_metrics->y_bearing + fs_metrics->height * hm; |
| cairo_matrix_transform_point (&scaled_font->font_matrix, |
| &x, &y); |
| if (first) { |
| min_user_x = max_user_x = x; |
| min_user_y = max_user_y = y; |
| } else { |
| if (x < min_user_x) min_user_x = x; |
| if (x > max_user_x) max_user_x = x; |
| if (y < min_user_y) min_user_y = y; |
| if (y > max_user_y) max_user_y = y; |
| } |
| |
| /* Transform this corner to device space from glyph origin */ |
| x = fs_metrics->x_bearing + fs_metrics->width * wm; |
| y = fs_metrics->y_bearing + fs_metrics->height * hm; |
| cairo_matrix_transform_distance (&scaled_font->scale, |
| &x, &y); |
| |
| if (first) { |
| min_device_x = max_device_x = x; |
| min_device_y = max_device_y = y; |
| } else { |
| if (x < min_device_x) min_device_x = x; |
| if (x > max_device_x) max_device_x = x; |
| if (y < min_device_y) min_device_y = y; |
| if (y > max_device_y) max_device_y = y; |
| } |
| first = FALSE; |
| } |
| scaled_glyph->metrics.x_bearing = min_user_x; |
| scaled_glyph->metrics.y_bearing = min_user_y; |
| scaled_glyph->metrics.width = max_user_x - min_user_x; |
| scaled_glyph->metrics.height = max_user_y - min_user_y; |
| |
| scaled_glyph->metrics.x_advance = fs_metrics->x_advance; |
| scaled_glyph->metrics.y_advance = fs_metrics->y_advance; |
| cairo_matrix_transform_distance (&scaled_font->font_matrix, |
| &scaled_glyph->metrics.x_advance, |
| &scaled_glyph->metrics.y_advance); |
| |
| device_x_advance = fs_metrics->x_advance; |
| device_y_advance = fs_metrics->y_advance; |
| cairo_matrix_transform_distance (&scaled_font->scale, |
| &device_x_advance, |
| &device_y_advance); |
| |
| scaled_glyph->bbox.p1.x = _cairo_fixed_from_double (min_device_x); |
| scaled_glyph->bbox.p1.y = _cairo_fixed_from_double (min_device_y); |
| scaled_glyph->bbox.p2.x = _cairo_fixed_from_double (max_device_x); |
| scaled_glyph->bbox.p2.y = _cairo_fixed_from_double (max_device_y); |
| |
| scaled_glyph->x_advance = _cairo_lround (device_x_advance); |
| scaled_glyph->y_advance = _cairo_lround (device_y_advance); |
| |
| scaled_glyph->has_info |= CAIRO_SCALED_GLYPH_INFO_METRICS; |
| } |
| |
| void |
| _cairo_scaled_glyph_set_surface (cairo_scaled_glyph_t *scaled_glyph, |
| cairo_scaled_font_t *scaled_font, |
| cairo_image_surface_t *surface) |
| { |
| if (scaled_glyph->surface != NULL) |
| cairo_surface_destroy (&scaled_glyph->surface->base); |
| |
| /* sanity check the backend glyph contents */ |
| _cairo_debug_check_image_surface_is_defined (&surface->base); |
| scaled_glyph->surface = surface; |
| |
| if (surface != NULL) |
| scaled_glyph->has_info |= CAIRO_SCALED_GLYPH_INFO_SURFACE; |
| else |
| scaled_glyph->has_info &= ~CAIRO_SCALED_GLYPH_INFO_SURFACE; |
| } |
| |
| void |
| _cairo_scaled_glyph_set_path (cairo_scaled_glyph_t *scaled_glyph, |
| cairo_scaled_font_t *scaled_font, |
| cairo_path_fixed_t *path) |
| { |
| if (scaled_glyph->path != NULL) |
| _cairo_path_fixed_destroy (scaled_glyph->path); |
| |
| scaled_glyph->path = path; |
| |
| if (path != NULL) |
| scaled_glyph->has_info |= CAIRO_SCALED_GLYPH_INFO_PATH; |
| else |
| scaled_glyph->has_info &= ~CAIRO_SCALED_GLYPH_INFO_PATH; |
| } |
| |
| void |
| _cairo_scaled_glyph_set_recording_surface (cairo_scaled_glyph_t *scaled_glyph, |
| cairo_scaled_font_t *scaled_font, |
| cairo_surface_t *recording_surface) |
| { |
| if (scaled_glyph->recording_surface != NULL) { |
| cairo_surface_finish (scaled_glyph->recording_surface); |
| cairo_surface_destroy (scaled_glyph->recording_surface); |
| } |
| |
| scaled_glyph->recording_surface = recording_surface; |
| |
| if (recording_surface != NULL) |
| scaled_glyph->has_info |= CAIRO_SCALED_GLYPH_INFO_RECORDING_SURFACE; |
| else |
| scaled_glyph->has_info &= ~CAIRO_SCALED_GLYPH_INFO_RECORDING_SURFACE; |
| } |
| |
| static cairo_bool_t |
| _cairo_scaled_glyph_page_can_remove (const void *closure) |
| { |
| const cairo_scaled_glyph_page_t *page = closure; |
| const cairo_scaled_font_t *scaled_font; |
| |
| scaled_font = (cairo_scaled_font_t *) page->cache_entry.hash; |
| return scaled_font->cache_frozen == 0; |
| } |
| |
| static cairo_status_t |
| _cairo_scaled_font_allocate_glyph (cairo_scaled_font_t *scaled_font, |
| cairo_scaled_glyph_t **scaled_glyph) |
| { |
| cairo_scaled_glyph_page_t *page; |
| cairo_status_t status; |
| |
| /* only the first page in the list may contain available slots */ |
| if (! cairo_list_is_empty (&scaled_font->glyph_pages)) { |
| page = cairo_list_last_entry (&scaled_font->glyph_pages, |
| cairo_scaled_glyph_page_t, |
| link); |
| if (page->num_glyphs < CAIRO_SCALED_GLYPH_PAGE_SIZE) { |
| *scaled_glyph = &page->glyphs[page->num_glyphs++]; |
| return CAIRO_STATUS_SUCCESS; |
| } |
| } |
| |
| page = malloc (sizeof (cairo_scaled_glyph_page_t)); |
| if (unlikely (page == NULL)) |
| return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| |
| page->cache_entry.hash = (unsigned long) scaled_font; |
| page->cache_entry.size = 1; /* XXX occupancy weighting? */ |
| page->num_glyphs = 0; |
| |
| CAIRO_MUTEX_LOCK (_cairo_scaled_glyph_page_cache_mutex); |
| if (scaled_font->global_cache_frozen == FALSE) { |
| if (unlikely (cairo_scaled_glyph_page_cache.hash_table == NULL)) { |
| status = _cairo_cache_init (&cairo_scaled_glyph_page_cache, |
| NULL, |
| _cairo_scaled_glyph_page_can_remove, |
| _cairo_scaled_glyph_page_destroy, |
| MAX_GLYPH_PAGES_CACHED); |
| if (unlikely (status)) { |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_glyph_page_cache_mutex); |
| free (page); |
| return status; |
| } |
| } |
| |
| _cairo_cache_freeze (&cairo_scaled_glyph_page_cache); |
| scaled_font->global_cache_frozen = TRUE; |
| } |
| |
| status = _cairo_cache_insert (&cairo_scaled_glyph_page_cache, |
| &page->cache_entry); |
| CAIRO_MUTEX_UNLOCK (_cairo_scaled_glyph_page_cache_mutex); |
| if (unlikely (status)) { |
| free (page); |
| return status; |
| } |
| |
| cairo_list_add_tail (&page->link, &scaled_font->glyph_pages); |
| |
| *scaled_glyph = &page->glyphs[page->num_glyphs++]; |
| return CAIRO_STATUS_SUCCESS; |
| } |
| |
| static void |
| _cairo_scaled_font_free_last_glyph (cairo_scaled_font_t *scaled_font, |
| cairo_scaled_glyph_t *scaled_glyph) |
| { |
| cairo_scaled_glyph_page_t *page; |
| |
| assert (! cairo_list_is_empty (&scaled_font->glyph_pages)); |
| page = cairo_list_last_entry (&scaled_font->glyph_pages, |
| cairo_scaled_glyph_page_t, |
| link); |
| assert (scaled_glyph == &page->glyphs[page->num_glyphs-1]); |
| |
| _cairo_scaled_glyph_fini (scaled_font, scaled_glyph); |
| |
| if (--page->num_glyphs == 0) { |
| _cairo_cache_remove (&cairo_scaled_glyph_page_cache, |
| &page->cache_entry); |
| } |
| } |
| |
| /** |
| * _cairo_scaled_glyph_lookup: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @index: the glyph to create |
| * @info: a #cairo_scaled_glyph_info_t marking which portions of |
| * the glyph should be filled in. |
| * @scaled_glyph_ret: a #cairo_scaled_glyph_t where the glyph |
| * is returned. |
| * |
| * If the desired info is not available, (for example, when trying to |
| * get INFO_PATH with a bitmapped font), this function will return |
| * %CAIRO_INT_STATUS_UNSUPPORTED. |
| * |
| * Note: This function must be called with the scaled font frozen, and it must |
| * remain frozen for as long as the @scaled_glyph_ret is alive. (If the scaled |
| * font was not frozen, then there is no guarantee that the glyph would not be |
| * evicted before you tried to access it.) See |
| * _cairo_scaled_font_freeze_cache() and _cairo_scaled_font_thaw_cache(). |
| * |
| * Returns: a glyph with the requested portions filled in. Glyph |
| * lookup is cached and glyph will be automatically freed along |
| * with the scaled_font so no explicit free is required. |
| * @info can be one or more of: |
| * %CAIRO_SCALED_GLYPH_INFO_METRICS - glyph metrics and bounding box |
| * %CAIRO_SCALED_GLYPH_INFO_SURFACE - surface holding glyph image |
| * %CAIRO_SCALED_GLYPH_INFO_PATH - path holding glyph outline in device space |
| **/ |
| cairo_int_status_t |
| _cairo_scaled_glyph_lookup (cairo_scaled_font_t *scaled_font, |
| unsigned long index, |
| cairo_scaled_glyph_info_t info, |
| cairo_scaled_glyph_t **scaled_glyph_ret) |
| { |
| cairo_status_t status = CAIRO_STATUS_SUCCESS; |
| cairo_scaled_glyph_t *scaled_glyph; |
| cairo_scaled_glyph_info_t need_info; |
| |
| *scaled_glyph_ret = NULL; |
| |
| if (unlikely (scaled_font->status)) |
| return scaled_font->status; |
| |
| assert (CAIRO_MUTEX_IS_LOCKED(scaled_font->mutex)); |
| |
| if (CAIRO_INJECT_FAULT ()) |
| return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| |
| /* |
| * Check cache for glyph |
| */ |
| scaled_glyph = _cairo_hash_table_lookup (scaled_font->glyphs, |
| (cairo_hash_entry_t *) &index); |
| if (scaled_glyph == NULL) { |
| status = _cairo_scaled_font_allocate_glyph (scaled_font, &scaled_glyph); |
| if (unlikely (status)) |
| goto err; |
| |
| memset (scaled_glyph, 0, sizeof (cairo_scaled_glyph_t)); |
| _cairo_scaled_glyph_set_index (scaled_glyph, index); |
| |
| /* ask backend to initialize metrics and shape fields */ |
| status = |
| scaled_font->backend->scaled_glyph_init (scaled_font, |
| scaled_glyph, |
| info | CAIRO_SCALED_GLYPH_INFO_METRICS); |
| if (unlikely (status)) { |
| _cairo_scaled_font_free_last_glyph (scaled_font, scaled_glyph); |
| goto err; |
| } |
| |
| status = _cairo_hash_table_insert (scaled_font->glyphs, |
| &scaled_glyph->hash_entry); |
| if (unlikely (status)) { |
| _cairo_scaled_font_free_last_glyph (scaled_font, scaled_glyph); |
| goto err; |
| } |
| } |
| |
| /* |
| * Check and see if the glyph, as provided, |
| * already has the requested data and amend it if not |
| */ |
| need_info = info & ~scaled_glyph->has_info; |
| if (need_info) { |
| status = scaled_font->backend->scaled_glyph_init (scaled_font, |
| scaled_glyph, |
| need_info); |
| if (unlikely (status)) |
| goto err; |
| |
| /* Don't trust the scaled_glyph_init() return value, the font |
| * backend may not even know about some of the info. For example, |
| * no backend other than the user-fonts knows about recording-surface |
| * glyph info. */ |
| if (info & ~scaled_glyph->has_info) |
| return CAIRO_INT_STATUS_UNSUPPORTED; |
| } |
| |
| *scaled_glyph_ret = scaled_glyph; |
| return CAIRO_STATUS_SUCCESS; |
| |
| err: |
| /* It's not an error for the backend to not support the info we want. */ |
| if (status != CAIRO_INT_STATUS_UNSUPPORTED) |
| status = _cairo_scaled_font_set_error (scaled_font, status); |
| return status; |
| } |
| |
| double |
| _cairo_scaled_font_get_max_scale (cairo_scaled_font_t *scaled_font) |
| { |
| return scaled_font->max_scale; |
| } |
| |
| |
| /** |
| * cairo_scaled_font_get_font_face: |
| * @scaled_font: a #cairo_scaled_font_t |
| * |
| * Gets the font face that this scaled font uses. This might be the |
| * font face passed to cairo_scaled_font_create(), but this does not |
| * hold true for all possible cases. |
| * |
| * Return value: The #cairo_font_face_t with which @scaled_font was |
| * created. |
| * |
| * Since: 1.2 |
| **/ |
| cairo_font_face_t * |
| cairo_scaled_font_get_font_face (cairo_scaled_font_t *scaled_font) |
| { |
| if (scaled_font->status) |
| return (cairo_font_face_t*) &_cairo_font_face_nil; |
| |
| if (scaled_font->original_font_face != NULL) |
| return scaled_font->original_font_face; |
| |
| return scaled_font->font_face; |
| } |
| slim_hidden_def (cairo_scaled_font_get_font_face); |
| |
| /** |
| * cairo_scaled_font_get_font_matrix: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @font_matrix: return value for the matrix |
| * |
| * Stores the font matrix with which @scaled_font was created into |
| * @matrix. |
| * |
| * Since: 1.2 |
| **/ |
| void |
| cairo_scaled_font_get_font_matrix (cairo_scaled_font_t *scaled_font, |
| cairo_matrix_t *font_matrix) |
| { |
| if (scaled_font->status) { |
| cairo_matrix_init_identity (font_matrix); |
| return; |
| } |
| |
| *font_matrix = scaled_font->font_matrix; |
| } |
| slim_hidden_def (cairo_scaled_font_get_font_matrix); |
| |
| /** |
| * cairo_scaled_font_get_ctm: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @ctm: return value for the CTM |
| * |
| * Stores the CTM with which @scaled_font was created into @ctm. |
| * Note that the translation offsets (x0, y0) of the CTM are ignored |
| * by cairo_scaled_font_create(). So, the matrix this |
| * function returns always has 0,0 as x0,y0. |
| * |
| * Since: 1.2 |
| **/ |
| void |
| cairo_scaled_font_get_ctm (cairo_scaled_font_t *scaled_font, |
| cairo_matrix_t *ctm) |
| { |
| if (scaled_font->status) { |
| cairo_matrix_init_identity (ctm); |
| return; |
| } |
| |
| *ctm = scaled_font->ctm; |
| } |
| slim_hidden_def (cairo_scaled_font_get_ctm); |
| |
| /** |
| * cairo_scaled_font_get_scale_matrix: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @scale_matrix: return value for the matrix |
| * |
| * Stores the scale matrix of @scaled_font into @matrix. |
| * The scale matrix is product of the font matrix and the ctm |
| * associated with the scaled font, and hence is the matrix mapping from |
| * font space to device space. |
| * |
| * Since: 1.8 |
| **/ |
| void |
| cairo_scaled_font_get_scale_matrix (cairo_scaled_font_t *scaled_font, |
| cairo_matrix_t *scale_matrix) |
| { |
| if (scaled_font->status) { |
| cairo_matrix_init_identity (scale_matrix); |
| return; |
| } |
| |
| *scale_matrix = scaled_font->scale; |
| } |
| |
| /** |
| * cairo_scaled_font_get_font_options: |
| * @scaled_font: a #cairo_scaled_font_t |
| * @options: return value for the font options |
| * |
| * Stores the font options with which @scaled_font was created into |
| * @options. |
| * |
| * Since: 1.2 |
| **/ |
| void |
| cairo_scaled_font_get_font_options (cairo_scaled_font_t *scaled_font, |
| cairo_font_options_t *options) |
| { |
| if (cairo_font_options_status (options)) |
| return; |
| |
| if (scaled_font->status) { |
| _cairo_font_options_init_default (options); |
| return; |
| } |
| |
| _cairo_font_options_init_copy (options, &scaled_font->options); |
| } |
| slim_hidden_def (cairo_scaled_font_get_font_options); |