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+/*
+ * Copyright © 2012,2013 Mozilla Foundation.
+ * Copyright © 2012,2013 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Mozilla Author(s): Jonathan Kew
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#define HB_SHAPER coretext
+
+#include "hb-private.hh"
+#include "hb-debug.hh"
+#include "hb-shaper-impl-private.hh"
+
+#include "hb-coretext.h"
+#include <math.h>
+
+#include <Foundation/Foundation.h>
+
+typedef bool (*qt_get_font_table_func_t) (void *user_data, unsigned int tag, unsigned char *buffer, unsigned int *length);
+
+struct FontEngineFaceData {
+ void *user_data;
+ qt_get_font_table_func_t get_font_table;
+};
+
+struct CoreTextFontEngineData {
+ CTFontRef ctFont;
+ CGFontRef cgFont;
+};
+
+
+/* https://developer.apple.com/documentation/coretext/1508745-ctfontcreatewithgraphicsfont */
+#define HB_CORETEXT_DEFAULT_FONT_SIZE 12.f
+
+static void
+release_table_data (void *user_data)
+{
+ CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);
+ CFRelease(cf_data);
+}
+
+static hb_blob_t *
+reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
+{
+ CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);
+ CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);
+ if (unlikely (!cf_data))
+ return nullptr;
+
+ const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));
+ const size_t length = CFDataGetLength (cf_data);
+ if (!data || !length)
+ return nullptr;
+
+ return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,
+ reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),
+ release_table_data);
+}
+
+static void
+_hb_cg_font_release (void *data)
+{
+ CGFontRelease ((CGFontRef) data);
+}
+
+
+HB_SHAPER_DATA_ENSURE_DEFINE(coretext, face)
+HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(coretext, font,
+ fabs (CTFontGetSize ((CTFontRef) data) - font->ptem) <= .5
+)
+
+static CTFontDescriptorRef
+get_last_resort_font_desc (void)
+{
+ // TODO Handle allocation failures?
+ CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0);
+ CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault,
+ (const void **) &last_resort,
+ 1,
+ &kCFTypeArrayCallBacks);
+ CFRelease (last_resort);
+ CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
+ (const void **) &kCTFontCascadeListAttribute,
+ (const void **) &cascade_list,
+ 1,
+ &kCFTypeDictionaryKeyCallBacks,
+ &kCFTypeDictionaryValueCallBacks);
+ CFRelease (cascade_list);
+
+ CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
+ CFRelease (attributes);
+ return font_desc;
+}
+
+static void
+release_data (void *info, const void *data, size_t size)
+{
+ assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
+ hb_blob_get_data ((hb_blob_t *) info, nullptr) == data);
+
+ hb_blob_destroy ((hb_blob_t *) info);
+}
+
+static CGFontRef
+create_cg_font (hb_face_t *face)
+{
+ CGFontRef cg_font = nullptr;
+ if (face->destroy == _hb_cg_font_release)
+ {
+ cg_font = CGFontRetain ((CGFontRef) face->user_data);
+ }
+ else
+ {
+#if 0
+ hb_blob_t *blob = hb_face_reference_blob (face);
+ unsigned int blob_length;
+ const char *blob_data = hb_blob_get_data (blob, &blob_length);
+ if (unlikely (!blob_length))
+ DEBUG_MSG (CORETEXT, face, "Face has empty blob");
+
+ CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
+ if (likely (provider))
+ {
+ cg_font = CGFontCreateWithDataProvider (provider);
+ if (unlikely (!cg_font))
+ DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
+ CGDataProviderRelease (provider);
+ }
+#else
+ FontEngineFaceData *fontEngineFaceData = (FontEngineFaceData *) face->user_data;
+ CoreTextFontEngineData *coreTextFontEngineData = (CoreTextFontEngineData *) fontEngineFaceData->user_data;
+ cg_font = CGFontRetain (coreTextFontEngineData->cgFont);
+#endif
+ }
+ return cg_font;
+}
+
+static CTFontRef
+create_ct_font (CGFontRef cg_font, CGFloat font_size)
+{
+ CTFontRef ct_font = nullptr;
+
+ /* CoreText does not enable trak table usage / tracking when creating a CTFont
+ * using CTFontCreateWithGraphicsFont. The only way of enabling tracking seems
+ * to be through the CTFontCreateUIFontForLanguage call. */
+ CFStringRef cg_postscript_name = CGFontCopyPostScriptName (cg_font);
+ if (CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSText")) ||
+ CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSDisplay")))
+ {
+ CTFontUIFontType font_type = kCTFontUIFontSystem;
+ if (CFStringHasSuffix (cg_postscript_name, CFSTR ("-Bold")))
+ font_type = kCTFontUIFontEmphasizedSystem;
+
+ ct_font = CTFontCreateUIFontForLanguage (font_type, font_size, nullptr);
+ CFStringRef ct_result_name = CTFontCopyPostScriptName(ct_font);
+ if (CFStringCompare (ct_result_name, cg_postscript_name, 0) != kCFCompareEqualTo)
+ {
+ CFRelease(ct_font);
+ ct_font = nullptr;
+ }
+ CFRelease (ct_result_name);
+ }
+ CFRelease (cg_postscript_name);
+
+ if (!ct_font)
+ ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, nullptr, nullptr);
+
+ if (unlikely (!ct_font)) {
+ DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
+ return nullptr;
+ }
+
+ /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter
+ * bug indicate that the cascade list reconfiguration occasionally causes
+ * crashes in CoreText on OS X 10.9, thus let's skip this step on older
+ * operating system versions. Except for the emoji font, where _not_
+ * reconfiguring the cascade list causes CoreText crashes. For details, see
+ * crbug.com/549610 */
+ // 0x00070000 stands for "kCTVersionNumber10_10", see CoreText.h
+ if (&CTGetCoreTextVersion != nullptr && CTGetCoreTextVersion() < 0x00070000) {
+ CFStringRef fontName = CTFontCopyPostScriptName (ct_font);
+ bool isEmojiFont = CFStringCompare (fontName, CFSTR("AppleColorEmoji"), 0) == kCFCompareEqualTo;
+ CFRelease (fontName);
+ if (!isEmojiFont)
+ return ct_font;
+ }
+
+ CFURLRef original_url = (CFURLRef)CTFontCopyAttribute(ct_font, kCTFontURLAttribute);
+
+ /* Create font copy with cascade list that has LastResort first; this speeds up CoreText
+ * font fallback which we don't need anyway. */
+ {
+ CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc ();
+ CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, last_resort_font_desc);
+ CFRelease (last_resort_font_desc);
+ if (new_ct_font)
+ {
+ /* The CTFontCreateCopyWithAttributes call fails to stay on the same font
+ * when reconfiguring the cascade list and may switch to a different font
+ * when there are fonts that go by the same name, since the descriptor is
+ * just name and size.
+ *
+ * Avoid reconfiguring the cascade lists if the new font is outside the
+ * system locations that we cannot access from the sandboxed renderer
+ * process in Blink. This can be detected by the new file URL location
+ * that the newly found font points to. */
+ CFURLRef new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute);
+ // Keep reconfigured font if URL cannot be retrieved (seems to be the case
+ // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606
+ if (!original_url || !new_url || CFEqual (original_url, new_url)) {
+ CFRelease (ct_font);
+ ct_font = new_ct_font;
+ } else {
+ CFRelease (new_ct_font);
+ DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
+ }
+ if (new_url)
+ CFRelease (new_url);
+ }
+ else
+ DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed");
+ }
+
+ if (original_url)
+ CFRelease (original_url);
+ return ct_font;
+}
+
+hb_coretext_shaper_face_data_t *
+_hb_coretext_shaper_face_data_create (hb_face_t *face)
+{
+ CGFontRef cg_font = create_cg_font (face);
+
+ if (unlikely (!cg_font))
+ {
+ DEBUG_MSG (CORETEXT, face, "CGFont creation failed..");
+ return nullptr;
+ }
+
+ return (hb_coretext_shaper_face_data_t *) cg_font;
+}
+
+void
+_hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data)
+{
+ CFRelease ((CGFontRef) data);
+}
+
+hb_face_t *
+hb_coretext_face_create (CGFontRef cg_font)
+{
+ return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), _hb_cg_font_release);
+}
+
+/*
+ * Since: 0.9.10
+ */
+CGFontRef
+hb_coretext_face_get_cg_font (hb_face_t *face)
+{
+ if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return nullptr;
+ return (CGFontRef) HB_SHAPER_DATA_GET (face);
+}
+
+
+hb_coretext_shaper_font_data_t *
+_hb_coretext_shaper_font_data_create (hb_font_t *font)
+{
+ hb_face_t *face = font->face;
+ if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return nullptr;
+ CGFontRef cg_font = (CGFontRef) HB_SHAPER_DATA_GET (face);
+
+ CGFloat font_size = font->ptem <= 0.f ? HB_CORETEXT_DEFAULT_FONT_SIZE : font->ptem;
+ CTFontRef ct_font = create_ct_font (cg_font, font_size);
+
+ if (unlikely (!ct_font))
+ {
+ DEBUG_MSG (CORETEXT, font, "CGFont creation failed..");
+ return nullptr;
+ }
+
+ return (hb_coretext_shaper_font_data_t *) ct_font;
+}
+
+void
+_hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data)
+{
+ CFRelease ((CTFontRef) data);
+}
+
+/*
+ * Since: 1.7.2
+ */
+hb_font_t *
+hb_coretext_font_create (CTFontRef ct_font)
+{
+ CGFontRef cg_font = CTFontCopyGraphicsFont (ct_font, 0);
+ hb_face_t *face = hb_coretext_face_create (cg_font);
+ CFRelease (cg_font);
+ hb_font_t *font = hb_font_create (face);
+ hb_face_destroy (face);
+
+ if (unlikely (hb_object_is_inert (font)))
+ return font;
+
+ hb_font_set_ptem (font, CTFontGetSize (ct_font));
+
+ /* Let there be dragons here... */
+ HB_SHAPER_DATA_GET (font) = (hb_coretext_shaper_font_data_t *) CFRetain (ct_font);
+
+ return font;
+}
+
+CTFontRef
+hb_coretext_font_get_ct_font (hb_font_t *font)
+{
+ if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return nullptr;
+ return (CTFontRef) HB_SHAPER_DATA_GET (font);
+}
+
+
+
+/*
+ * shaper shape_plan data
+ */
+
+struct hb_coretext_shaper_shape_plan_data_t {};
+
+hb_coretext_shaper_shape_plan_data_t *
+_hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
+ const hb_feature_t *user_features HB_UNUSED,
+ unsigned int num_user_features HB_UNUSED,
+ const int *coords HB_UNUSED,
+ unsigned int num_coords HB_UNUSED)
+{
+ return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
+}
+
+void
+_hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED)
+{
+}
+
+
+/*
+ * shaper
+ */
+
+struct feature_record_t {
+ unsigned int feature;
+ unsigned int setting;
+};
+
+struct active_feature_t {
+ feature_record_t rec;
+ unsigned int order;
+
+ static int cmp (const void *pa, const void *pb) {
+ const active_feature_t *a = (const active_feature_t *) pa;
+ const active_feature_t *b = (const active_feature_t *) pb;
+ return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :
+ a->order < b->order ? -1 : a->order > b->order ? 1 :
+ a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
+ 0;
+ }
+ bool operator== (const active_feature_t *f) {
+ return cmp (this, f) == 0;
+ }
+};
+
+struct feature_event_t {
+ unsigned int index;
+ bool start;
+ active_feature_t feature;
+
+ static int cmp (const void *pa, const void *pb) {
+ const feature_event_t *a = (const feature_event_t *) pa;
+ const feature_event_t *b = (const feature_event_t *) pb;
+ return a->index < b->index ? -1 : a->index > b->index ? 1 :
+ a->start < b->start ? -1 : a->start > b->start ? 1 :
+ active_feature_t::cmp (&a->feature, &b->feature);
+ }
+};
+
+struct range_record_t {
+ CTFontRef font;
+ unsigned int index_first; /* == start */
+ unsigned int index_last; /* == end - 1 */
+};
+
+
+/* The following enum members are added in OS X 10.8. */
+#define kAltHalfWidthTextSelector 6
+#define kAltProportionalTextSelector 5
+#define kAlternateHorizKanaOffSelector 1
+#define kAlternateHorizKanaOnSelector 0
+#define kAlternateKanaType 34
+#define kAlternateVertKanaOffSelector 3
+#define kAlternateVertKanaOnSelector 2
+#define kCaseSensitiveLayoutOffSelector 1
+#define kCaseSensitiveLayoutOnSelector 0
+#define kCaseSensitiveLayoutType 33
+#define kCaseSensitiveSpacingOffSelector 3
+#define kCaseSensitiveSpacingOnSelector 2
+#define kContextualAlternatesOffSelector 1
+#define kContextualAlternatesOnSelector 0
+#define kContextualAlternatesType 36
+#define kContextualLigaturesOffSelector 19
+#define kContextualLigaturesOnSelector 18
+#define kContextualSwashAlternatesOffSelector 5
+#define kContextualSwashAlternatesOnSelector 4
+#define kDefaultLowerCaseSelector 0
+#define kDefaultUpperCaseSelector 0
+#define kHistoricalLigaturesOffSelector 21
+#define kHistoricalLigaturesOnSelector 20
+#define kHojoCharactersSelector 12
+#define kJIS2004CharactersSelector 11
+#define kLowerCasePetiteCapsSelector 2
+#define kLowerCaseSmallCapsSelector 1
+#define kLowerCaseType 37
+#define kMathematicalGreekOffSelector 11
+#define kMathematicalGreekOnSelector 10
+#define kNLCCharactersSelector 13
+#define kQuarterWidthTextSelector 4
+#define kScientificInferiorsSelector 4
+#define kStylisticAltEightOffSelector 17
+#define kStylisticAltEightOnSelector 16
+#define kStylisticAltEighteenOffSelector 37
+#define kStylisticAltEighteenOnSelector 36
+#define kStylisticAltElevenOffSelector 23
+#define kStylisticAltElevenOnSelector 22
+#define kStylisticAltFifteenOffSelector 31
+#define kStylisticAltFifteenOnSelector 30
+#define kStylisticAltFiveOffSelector 11
+#define kStylisticAltFiveOnSelector 10
+#define kStylisticAltFourOffSelector 9
+#define kStylisticAltFourOnSelector 8
+#define kStylisticAltFourteenOffSelector 29
+#define kStylisticAltFourteenOnSelector 28
+#define kStylisticAltNineOffSelector 19
+#define kStylisticAltNineOnSelector 18
+#define kStylisticAltNineteenOffSelector 39
+#define kStylisticAltNineteenOnSelector 38
+#define kStylisticAltOneOffSelector 3
+#define kStylisticAltOneOnSelector 2
+#define kStylisticAltSevenOffSelector 15
+#define kStylisticAltSevenOnSelector 14
+#define kStylisticAltSeventeenOffSelector 35
+#define kStylisticAltSeventeenOnSelector 34
+#define kStylisticAltSixOffSelector 13
+#define kStylisticAltSixOnSelector 12
+#define kStylisticAltSixteenOffSelector 33
+#define kStylisticAltSixteenOnSelector 32
+#define kStylisticAltTenOffSelector 21
+#define kStylisticAltTenOnSelector 20
+#define kStylisticAltThirteenOffSelector 27
+#define kStylisticAltThirteenOnSelector 26
+#define kStylisticAltThreeOffSelector 7
+#define kStylisticAltThreeOnSelector 6
+#define kStylisticAltTwelveOffSelector 25
+#define kStylisticAltTwelveOnSelector 24
+#define kStylisticAltTwentyOffSelector 41
+#define kStylisticAltTwentyOnSelector 40
+#define kStylisticAltTwoOffSelector 5
+#define kStylisticAltTwoOnSelector 4
+#define kStylisticAlternativesType 35
+#define kSwashAlternatesOffSelector 3
+#define kSwashAlternatesOnSelector 2
+#define kThirdWidthTextSelector 3
+#define kTraditionalNamesCharactersSelector 14
+#define kUpperCasePetiteCapsSelector 2
+#define kUpperCaseSmallCapsSelector 1
+#define kUpperCaseType 38
+
+/* Table data courtesy of Apple. */
+static const struct feature_mapping_t {
+ FourCharCode otFeatureTag;
+ uint16_t aatFeatureType;
+ uint16_t selectorToEnable;
+ uint16_t selectorToDisable;
+} feature_mappings[] = {
+ { 'c2pc', kUpperCaseType, kUpperCasePetiteCapsSelector, kDefaultUpperCaseSelector },
+ { 'c2sc', kUpperCaseType, kUpperCaseSmallCapsSelector, kDefaultUpperCaseSelector },
+ { 'calt', kContextualAlternatesType, kContextualAlternatesOnSelector, kContextualAlternatesOffSelector },
+ { 'case', kCaseSensitiveLayoutType, kCaseSensitiveLayoutOnSelector, kCaseSensitiveLayoutOffSelector },
+ { 'clig', kLigaturesType, kContextualLigaturesOnSelector, kContextualLigaturesOffSelector },
+ { 'cpsp', kCaseSensitiveLayoutType, kCaseSensitiveSpacingOnSelector, kCaseSensitiveSpacingOffSelector },
+ { 'cswh', kContextualAlternatesType, kContextualSwashAlternatesOnSelector, kContextualSwashAlternatesOffSelector },
+ { 'dlig', kLigaturesType, kRareLigaturesOnSelector, kRareLigaturesOffSelector },
+ { 'expt', kCharacterShapeType, kExpertCharactersSelector, 16 },
+ { 'frac', kFractionsType, kDiagonalFractionsSelector, kNoFractionsSelector },
+ { 'fwid', kTextSpacingType, kMonospacedTextSelector, 7 },
+ { 'halt', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
+ { 'hist', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
+ { 'hkna', kAlternateKanaType, kAlternateHorizKanaOnSelector, kAlternateHorizKanaOffSelector, },
+ { 'hlig', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector },
+ { 'hngl', kTransliterationType, kHanjaToHangulSelector, kNoTransliterationSelector },
+ { 'hojo', kCharacterShapeType, kHojoCharactersSelector, 16 },
+ { 'hwid', kTextSpacingType, kHalfWidthTextSelector, 7 },
+ { 'ital', kItalicCJKRomanType, kCJKItalicRomanOnSelector, kCJKItalicRomanOffSelector },
+ { 'jp04', kCharacterShapeType, kJIS2004CharactersSelector, 16 },
+ { 'jp78', kCharacterShapeType, kJIS1978CharactersSelector, 16 },
+ { 'jp83', kCharacterShapeType, kJIS1983CharactersSelector, 16 },
+ { 'jp90', kCharacterShapeType, kJIS1990CharactersSelector, 16 },
+ { 'liga', kLigaturesType, kCommonLigaturesOnSelector, kCommonLigaturesOffSelector },
+ { 'lnum', kNumberCaseType, kUpperCaseNumbersSelector, 2 },
+ { 'mgrk', kMathematicalExtrasType, kMathematicalGreekOnSelector, kMathematicalGreekOffSelector },
+ { 'nlck', kCharacterShapeType, kNLCCharactersSelector, 16 },
+ { 'onum', kNumberCaseType, kLowerCaseNumbersSelector, 2 },
+ { 'ordn', kVerticalPositionType, kOrdinalsSelector, kNormalPositionSelector },
+ { 'palt', kTextSpacingType, kAltProportionalTextSelector, 7 },
+ { 'pcap', kLowerCaseType, kLowerCasePetiteCapsSelector, kDefaultLowerCaseSelector },
+ { 'pkna', kTextSpacingType, kProportionalTextSelector, 7 },
+ { 'pnum', kNumberSpacingType, kProportionalNumbersSelector, 4 },
+ { 'pwid', kTextSpacingType, kProportionalTextSelector, 7 },
+ { 'qwid', kTextSpacingType, kQuarterWidthTextSelector, 7 },
+ { 'ruby', kRubyKanaType, kRubyKanaOnSelector, kRubyKanaOffSelector },
+ { 'sinf', kVerticalPositionType, kScientificInferiorsSelector, kNormalPositionSelector },
+ { 'smcp', kLowerCaseType, kLowerCaseSmallCapsSelector, kDefaultLowerCaseSelector },
+ { 'smpl', kCharacterShapeType, kSimplifiedCharactersSelector, 16 },
+ { 'ss01', kStylisticAlternativesType, kStylisticAltOneOnSelector, kStylisticAltOneOffSelector },
+ { 'ss02', kStylisticAlternativesType, kStylisticAltTwoOnSelector, kStylisticAltTwoOffSelector },
+ { 'ss03', kStylisticAlternativesType, kStylisticAltThreeOnSelector, kStylisticAltThreeOffSelector },
+ { 'ss04', kStylisticAlternativesType, kStylisticAltFourOnSelector, kStylisticAltFourOffSelector },
+ { 'ss05', kStylisticAlternativesType, kStylisticAltFiveOnSelector, kStylisticAltFiveOffSelector },
+ { 'ss06', kStylisticAlternativesType, kStylisticAltSixOnSelector, kStylisticAltSixOffSelector },
+ { 'ss07', kStylisticAlternativesType, kStylisticAltSevenOnSelector, kStylisticAltSevenOffSelector },
+ { 'ss08', kStylisticAlternativesType, kStylisticAltEightOnSelector, kStylisticAltEightOffSelector },
+ { 'ss09', kStylisticAlternativesType, kStylisticAltNineOnSelector, kStylisticAltNineOffSelector },
+ { 'ss10', kStylisticAlternativesType, kStylisticAltTenOnSelector, kStylisticAltTenOffSelector },
+ { 'ss11', kStylisticAlternativesType, kStylisticAltElevenOnSelector, kStylisticAltElevenOffSelector },
+ { 'ss12', kStylisticAlternativesType, kStylisticAltTwelveOnSelector, kStylisticAltTwelveOffSelector },
+ { 'ss13', kStylisticAlternativesType, kStylisticAltThirteenOnSelector, kStylisticAltThirteenOffSelector },
+ { 'ss14', kStylisticAlternativesType, kStylisticAltFourteenOnSelector, kStylisticAltFourteenOffSelector },
+ { 'ss15', kStylisticAlternativesType, kStylisticAltFifteenOnSelector, kStylisticAltFifteenOffSelector },
+ { 'ss16', kStylisticAlternativesType, kStylisticAltSixteenOnSelector, kStylisticAltSixteenOffSelector },
+ { 'ss17', kStylisticAlternativesType, kStylisticAltSeventeenOnSelector, kStylisticAltSeventeenOffSelector },
+ { 'ss18', kStylisticAlternativesType, kStylisticAltEighteenOnSelector, kStylisticAltEighteenOffSelector },
+ { 'ss19', kStylisticAlternativesType, kStylisticAltNineteenOnSelector, kStylisticAltNineteenOffSelector },
+ { 'ss20', kStylisticAlternativesType, kStylisticAltTwentyOnSelector, kStylisticAltTwentyOffSelector },
+ { 'subs', kVerticalPositionType, kInferiorsSelector, kNormalPositionSelector },
+ { 'sups', kVerticalPositionType, kSuperiorsSelector, kNormalPositionSelector },
+ { 'swsh', kContextualAlternatesType, kSwashAlternatesOnSelector, kSwashAlternatesOffSelector },
+ { 'titl', kStyleOptionsType, kTitlingCapsSelector, kNoStyleOptionsSelector },
+ { 'tnam', kCharacterShapeType, kTraditionalNamesCharactersSelector, 16 },
+ { 'tnum', kNumberSpacingType, kMonospacedNumbersSelector, 4 },
+ { 'trad', kCharacterShapeType, kTraditionalCharactersSelector, 16 },
+ { 'twid', kTextSpacingType, kThirdWidthTextSelector, 7 },
+ { 'unic', kLetterCaseType, 14, 15 },
+ { 'valt', kTextSpacingType, kAltProportionalTextSelector, 7 },
+ { 'vert', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
+ { 'vhal', kTextSpacingType, kAltHalfWidthTextSelector, 7 },
+ { 'vkna', kAlternateKanaType, kAlternateVertKanaOnSelector, kAlternateVertKanaOffSelector },
+ { 'vpal', kTextSpacingType, kAltProportionalTextSelector, 7 },
+ { 'vrt2', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector },
+ { 'zero', kTypographicExtrasType, kSlashedZeroOnSelector, kSlashedZeroOffSelector },
+};
+
+static int
+_hb_feature_mapping_cmp (const void *key_, const void *entry_)
+{
+ unsigned int key = * (unsigned int *) key_;
+ const feature_mapping_t * entry = (const feature_mapping_t *) entry_;
+ return key < entry->otFeatureTag ? -1 :
+ key > entry->otFeatureTag ? 1 :
+ 0;
+}
+
+hb_bool_t
+_hb_coretext_shape (hb_shape_plan_t *shape_plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer,
+ const hb_feature_t *features,
+ unsigned int num_features)
+{
+ hb_face_t *face = font->face;
+ CGFontRef cg_font = (CGFontRef) HB_SHAPER_DATA_GET (face);
+ CTFontRef ct_font = (CTFontRef) HB_SHAPER_DATA_GET (font);
+
+ CGFloat ct_font_size = CTFontGetSize (ct_font);
+ CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size;
+ CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size;
+
+ /* Attach marks to their bases, to match the 'ot' shaper.
+ * Adapted from hb-ot-shape:hb_form_clusters().
+ * Note that this only makes us be closer to the 'ot' shaper,
+ * but by no means the same. For example, if there's
+ * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
+ * continue pointing to B2 even though B2 was merged into B1's
+ * cluster... */
+ if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
+ {
+ hb_unicode_funcs_t *unicode = buffer->unicode;
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ for (unsigned int i = 1; i < count; i++)
+ if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
+ buffer->merge_clusters (i - 1, i + 1);
+ }
+
+ hb_auto_array_t<feature_record_t> feature_records;
+ hb_auto_array_t<range_record_t> range_records;
+
+ /*
+ * Set up features.
+ * (copied + modified from code from hb-uniscribe.cc)
+ */
+ if (num_features)
+ {
+ /* Sort features by start/end events. */
+ hb_auto_array_t<feature_event_t> feature_events;
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag,
+ feature_mappings,
+ ARRAY_LENGTH (feature_mappings),
+ sizeof (feature_mappings[0]),
+ _hb_feature_mapping_cmp);
+ if (!mapping)
+ continue;
+
+ active_feature_t feature;
+ feature.rec.feature = mapping->aatFeatureType;
+ feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;
+ feature.order = i;
+
+ feature_event_t *event;
+
+ event = feature_events.push ();
+ if (unlikely (!event))
+ goto fail_features;
+ event->index = features[i].start;
+ event->start = true;
+ event->feature = feature;
+
+ event = feature_events.push ();
+ if (unlikely (!event))
+ goto fail_features;
+ event->index = features[i].end;
+ event->start = false;
+ event->feature = feature;
+ }
+ feature_events.qsort ();
+ /* Add a strategic final event. */
+ {
+ active_feature_t feature;
+ feature.rec.feature = HB_TAG_NONE;
+ feature.rec.setting = 0;
+ feature.order = num_features + 1;
+
+ feature_event_t *event = feature_events.push ();
+ if (unlikely (!event))
+ goto fail_features;
+ event->index = 0; /* This value does magic. */
+ event->start = false;
+ event->feature = feature;
+ }
+
+ /* Scan events and save features for each range. */
+ hb_auto_array_t<active_feature_t> active_features;
+ unsigned int last_index = 0;
+ for (unsigned int i = 0; i < feature_events.len; i++)
+ {
+ feature_event_t *event = &feature_events[i];
+
+ if (event->index != last_index)
+ {
+ /* Save a snapshot of active features and the range. */
+ range_record_t *range = range_records.push ();
+ if (unlikely (!range))
+ goto fail_features;
+
+ if (active_features.len)
+ {
+ CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
+
+ /* TODO sort and resolve conflicting features? */
+ /* active_features.qsort (); */
+ for (unsigned int j = 0; j < active_features.len; j++)
+ {
+ CFStringRef keys[] = {
+ kCTFontFeatureTypeIdentifierKey,
+ kCTFontFeatureSelectorIdentifierKey
+ };
+ CFNumberRef values[] = {
+ CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),
+ CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
+ };
+ static_assert ((ARRAY_LENGTH_CONST (keys) == ARRAY_LENGTH_CONST (values)), "");
+ CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,
+ (const void **) keys,
+ (const void **) values,
+ ARRAY_LENGTH (keys),
+ &kCFTypeDictionaryKeyCallBacks,
+ &kCFTypeDictionaryValueCallBacks);
+ for (unsigned int i = 0; i < ARRAY_LENGTH (values); i++)
+ CFRelease (values[i]);
+
+ CFArrayAppendValue (features_array, dict);
+ CFRelease (dict);
+
+ }
+
+ CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
+ (const void **) &kCTFontFeatureSettingsAttribute,
+ (const void **) &features_array,
+ 1,
+ &kCFTypeDictionaryKeyCallBacks,
+ &kCFTypeDictionaryValueCallBacks);
+ CFRelease (features_array);
+
+ CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
+ CFRelease (attributes);
+
+ range->font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, font_desc);
+ CFRelease (font_desc);
+ }
+ else
+ {
+ range->font = nullptr;
+ }
+
+ range->index_first = last_index;
+ range->index_last = event->index - 1;
+
+ last_index = event->index;
+ }
+
+ if (event->start) {
+ active_feature_t *feature = active_features.push ();
+ if (unlikely (!feature))
+ goto fail_features;
+ *feature = event->feature;
+ } else {
+ active_feature_t *feature = active_features.find (&event->feature);
+ if (feature)
+ active_features.remove (feature - active_features.array);
+ }
+ }
+ }
+ else
+ {
+ fail_features:
+ num_features = 0;
+ }
+
+ unsigned int scratch_size;
+ hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
+
+#define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
+ Type *name = (Type *) scratch; \
+ { \
+ unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
+ if (unlikely (_consumed > scratch_size)) \
+ { \
+ on_no_room; \
+ assert (0); \
+ } \
+ scratch += _consumed; \
+ scratch_size -= _consumed; \
+ }
+
+ ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/);
+ unsigned int chars_len = 0;
+ for (unsigned int i = 0; i < buffer->len; i++) {
+ hb_codepoint_t c = buffer->info[i].codepoint;
+ if (likely (c <= 0xFFFFu))
+ pchars[chars_len++] = c;
+ else if (unlikely (c > 0x10FFFFu))
+ pchars[chars_len++] = 0xFFFDu;
+ else {
+ pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
+ pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1u << 10) - 1));
+ }
+ }
+
+ ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/);
+ chars_len = 0;
+ for (unsigned int i = 0; i < buffer->len; i++)
+ {
+ hb_codepoint_t c = buffer->info[i].codepoint;
+ unsigned int cluster = buffer->info[i].cluster;
+ log_clusters[chars_len++] = cluster;
+ if (hb_in_range (c, 0x10000u, 0x10FFFFu))
+ log_clusters[chars_len++] = cluster; /* Surrogates. */
+ }
+
+#define FAIL(...) \
+ HB_STMT_START { \
+ DEBUG_MSG (CORETEXT, nullptr, __VA_ARGS__); \
+ ret = false; \
+ goto fail; \
+ } HB_STMT_END;
+
+ bool ret = true;
+ CFStringRef string_ref = nullptr;
+ CTLineRef line = nullptr;
+
+ if (0)
+ {
+resize_and_retry:
+ DEBUG_MSG (CORETEXT, buffer, "Buffer resize");
+ /* string_ref uses the scratch-buffer for backing store, and line references
+ * string_ref (via attr_string). We must release those before resizing buffer. */
+ assert (string_ref);
+ assert (line);
+ CFRelease (string_ref);
+ CFRelease (line);
+ string_ref = nullptr;
+ line = nullptr;
+
+ /* Get previous start-of-scratch-area, that we use later for readjusting
+ * our existing scratch arrays. */
+ unsigned int old_scratch_used;
+ hb_buffer_t::scratch_buffer_t *old_scratch;
+ old_scratch = buffer->get_scratch_buffer (&old_scratch_used);
+ old_scratch_used = scratch - old_scratch;
+
+ if (unlikely (!buffer->ensure (buffer->allocated * 2)))
+ FAIL ("Buffer resize failed");
+
+ /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the
+ * cleanest way to do without completely restructuring the rest of this shaper. */
+ scratch = buffer->get_scratch_buffer (&scratch_size);
+ pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));
+ log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));
+ scratch += old_scratch_used;
+ scratch_size -= old_scratch_used;
+ }
+ {
+ string_ref = CFStringCreateWithCharactersNoCopy (nullptr,
+ pchars, chars_len,
+ kCFAllocatorNull);
+ if (unlikely (!string_ref))
+ FAIL ("CFStringCreateWithCharactersNoCopy failed");
+
+ /* Create an attributed string, populate it, and create a line from it, then release attributed string. */
+ {
+ CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,
+ chars_len);
+ if (unlikely (!attr_string))
+ FAIL ("CFAttributedStringCreateMutable failed");
+ CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
+ if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
+ {
+ CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
+ kCTVerticalFormsAttributeName, kCFBooleanTrue);
+ }
+
+ if (buffer->props.language)
+ {
+/* What's the iOS equivalent of this check?
+ * The symbols was introduced in iOS 7.0.
+ * At any rate, our fallback is safe and works fine. */
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
+# define kCTLanguageAttributeName CFSTR ("NSLanguage")
+#endif
+ CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
+ hb_language_to_string (buffer->props.language),
+ kCFStringEncodingUTF8,
+ kCFAllocatorNull);
+ if (unlikely (!lang))
+ FAIL ("CFStringCreateWithCStringNoCopy failed");
+ CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
+ kCTLanguageAttributeName, lang);
+ CFRelease (lang);
+ }
+ CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
+ kCTFontAttributeName, ct_font);
+
+ if (num_features && range_records.len)
+ {
+ unsigned int start = 0;
+ range_record_t *last_range = &range_records[0];
+ for (unsigned int k = 0; k < chars_len; k++)
+ {
+ range_record_t *range = last_range;
+ while (log_clusters[k] < range->index_first)
+ range--;
+ while (log_clusters[k] > range->index_last)
+ range++;
+ if (range != last_range)
+ {
+ if (last_range->font)
+ CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),
+ kCTFontAttributeName, last_range->font);
+
+ start = k;
+ }
+
+ last_range = range;
+ }
+ if (start != chars_len && last_range->font)
+ CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),
+ kCTFontAttributeName, last_range->font);
+ }
+ /* Enable/disable kern if requested.
+ *
+ * Note: once kern is disabled, reenabling it doesn't currently seem to work in CoreText.
+ */
+ if (num_features)
+ {
+ unsigned int zeroint = 0;
+ CFNumberRef zero = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &zeroint);
+ for (unsigned int i = 0; i < num_features; i++)
+ {
+ const hb_feature_t &feature = features[i];
+ if (feature.tag == HB_TAG('k','e','r','n') &&
+ feature.start < chars_len && feature.start < feature.end)
+ {
+ CFRange feature_range = CFRangeMake (feature.start,
+ MIN (feature.end, chars_len) - feature.start);
+ if (feature.value)
+ CFAttributedStringRemoveAttribute (attr_string, feature_range, kCTKernAttributeName);
+ else
+ CFAttributedStringSetAttribute (attr_string, feature_range, kCTKernAttributeName, zero);
+ }
+ }
+ CFRelease (zero);
+ }
+
+ int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
+ CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);
+ CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,
+ (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,
+ (const void **) &level_number,
+ 1,
+ &kCFTypeDictionaryKeyCallBacks,
+ &kCFTypeDictionaryValueCallBacks);
+ CFRelease (level_number);
+ if (unlikely (!options))
+ FAIL ("CFDictionaryCreate failed");
+
+ CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
+ CFRelease (options);
+ CFRelease (attr_string);
+ if (unlikely (!typesetter))
+ FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");
+
+ line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));
+ CFRelease (typesetter);
+ if (unlikely (!line))
+ FAIL ("CTTypesetterCreateLine failed");
+ }
+
+ CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
+ unsigned int num_runs = CFArrayGetCount (glyph_runs);
+ DEBUG_MSG (CORETEXT, nullptr, "Num runs: %d", num_runs);
+
+ buffer->len = 0;
+ uint32_t status_and = ~0, status_or = 0;
+ double advances_so_far = 0;
+ /* For right-to-left runs, CoreText returns the glyphs positioned such that
+ * any trailing whitespace is to the left of (0,0). Adjust coordinate system
+ * to fix for that. Test with any RTL string with trailing spaces.
+ * https://code.google.com/p/chromium/issues/detail?id=469028
+ */
+ if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
+ {
+ advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
+ if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
+ advances_so_far = -advances_so_far;
+ }
+
+ const CFRange range_all = CFRangeMake (0, 0);
+
+ for (unsigned int i = 0; i < num_runs; i++)
+ {
+ CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
+ CTRunStatus run_status = CTRunGetStatus (run);
+ status_or |= run_status;
+ status_and &= run_status;
+ DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
+ double run_advance = CTRunGetTypographicBounds (run, range_all, nullptr, nullptr, nullptr);
+ if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
+ run_advance = -run_advance;
+ DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);
+
+ /* CoreText does automatic font fallback (AKA "cascading") for characters
+ * not supported by the requested font, and provides no way to turn it off,
+ * so we must detect if the returned run uses a font other than the requested
+ * one and fill in the buffer with .notdef glyphs instead of random glyph
+ * indices from a different font.
+ */
+ CFDictionaryRef attributes = CTRunGetAttributes (run);
+ CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));
+ if (!CFEqual (run_ct_font, ct_font))
+ {
+ /* The run doesn't use our main font instance. We have to figure out
+ * whether font fallback happened, or this is just CoreText giving us
+ * another CTFont using the same underlying CGFont. CoreText seems
+ * to do that in a variety of situations, one of which being vertical
+ * text, but also perhaps for caching reasons.
+ *
+ * First, see if it uses any of our subfonts created to set font features...
+ *
+ * Next, compare the CGFont to the one we used to create our fonts.
+ * Even this doesn't work all the time.
+ *
+ * Finally, we compare PS names, which I don't think are unique...
+ *
+ * Looks like if we really want to be sure here we have to modify the
+ * font to change the name table, similar to what we do in the uniscribe
+ * backend.
+ *
+ * However, even that wouldn't work if we were passed in the CGFont to
+ * construct a hb_face to begin with.
+ *
+ * See: http://github.com/harfbuzz/harfbuzz/pull/36
+ *
+ * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098
+ */
+ bool matched = false;
+ for (unsigned int i = 0; i < range_records.len; i++)
+ if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
+ {
+ matched = true;
+ break;
+ }
+ if (!matched)
+ {
+ CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0);
+ if (run_cg_font)
+ {
+ matched = CFEqual (run_cg_font, cg_font);
+ CFRelease (run_cg_font);
+ }
+ }
+ if (!matched)
+ {
+ CFStringRef font_ps_name = CTFontCopyName (ct_font, kCTFontPostScriptNameKey);
+ CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);
+ CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);
+ CFRelease (run_ps_name);
+ CFRelease (font_ps_name);
+ if (result == kCFCompareEqualTo)
+ matched = true;
+ }
+ if (!matched)
+ {
+ CFRange range = CTRunGetStringRange (run);
+ DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
+ range.location, range.location + range.length);
+ if (!buffer->ensure_inplace (buffer->len + range.length))
+ goto resize_and_retry;
+ hb_glyph_info_t *info = buffer->info + buffer->len;
+
+ hb_codepoint_t notdef = 0;
+ hb_direction_t dir = buffer->props.direction;
+ hb_position_t x_advance, y_advance, x_offset, y_offset;
+ hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);
+ hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);
+ hb_position_t advance = x_advance + y_advance;
+ x_offset = -x_offset;
+ y_offset = -y_offset;
+
+ unsigned int old_len = buffer->len;
+ for (CFIndex j = range.location; j < range.location + range.length; j++)
+ {
+ UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
+ if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)
+ {
+ ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
+ if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))
+ /* This is the second of a surrogate pair. Don't need .notdef
+ * for this one. */
+ continue;
+ }
+ if (buffer->unicode->is_default_ignorable (ch))
+ continue;
+
+ info->codepoint = notdef;
+ info->cluster = log_clusters[j];
+
+ info->mask = advance;
+ info->var1.i32 = x_offset;
+ info->var2.i32 = y_offset;
+
+ info++;
+ buffer->len++;
+ }
+ if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
+ buffer->reverse_range (old_len, buffer->len);
+ advances_so_far += run_advance;
+ continue;
+ }
+ }
+
+ unsigned int num_glyphs = CTRunGetGlyphCount (run);
+ if (num_glyphs == 0)
+ continue;
+
+ if (!buffer->ensure_inplace (buffer->len + num_glyphs))
+ goto resize_and_retry;
+
+ hb_glyph_info_t *run_info = buffer->info + buffer->len;
+
+ /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
+ * succeed, and so copying data to our own buffer will be rare. Reports
+ * have it that this changed in OS X 10.10 Yosemite, and nullptr is returned
+ * frequently. At any rate, we can test that codepath by setting USE_PTR
+ * to false. */
+
+#define USE_PTR true
+
+#define SCRATCH_SAVE() \
+ unsigned int scratch_size_saved = scratch_size; \
+ hb_buffer_t::scratch_buffer_t *scratch_saved = scratch
+
+#define SCRATCH_RESTORE() \
+ scratch_size = scratch_size_saved; \
+ scratch = scratch_saved;
+
+ { /* Setup glyphs */
+ SCRATCH_SAVE();
+ const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : nullptr;
+ if (!glyphs) {
+ ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
+ CTRunGetGlyphs (run, range_all, glyph_buf);
+ glyphs = glyph_buf;
+ }
+ const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : nullptr;
+ if (!string_indices) {
+ ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
+ CTRunGetStringIndices (run, range_all, index_buf);
+ string_indices = index_buf;
+ }
+ hb_glyph_info_t *info = run_info;
+ for (unsigned int j = 0; j < num_glyphs; j++)
+ {
+ info->codepoint = glyphs[j];
+ info->cluster = log_clusters[string_indices[j]];
+ info++;
+ }
+ SCRATCH_RESTORE();
+ }
+ {
+ /* Setup positions.
+ * Note that CoreText does not return advances for glyphs. As such,
+ * for all but last glyph, we use the delta position to next glyph as
+ * advance (in the advance direction only), and for last glyph we set
+ * whatever is needed to make the whole run's advance add up. */
+ SCRATCH_SAVE();
+ const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : nullptr;
+ if (!positions) {
+ ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
+ CTRunGetPositions (run, range_all, position_buf);
+ positions = position_buf;
+ }
+ hb_glyph_info_t *info = run_info;
+ if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
+ {
+ hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;
+ for (unsigned int j = 0; j < num_glyphs; j++)
+ {
+ double advance;
+ if (likely (j + 1 < num_glyphs))
+ advance = positions[j + 1].x - positions[j].x;
+ else /* last glyph */
+ advance = run_advance - (positions[j].x - positions[0].x);
+ info->mask = advance * x_mult;
+ info->var1.i32 = x_offset;
+ info->var2.i32 = positions[j].y * y_mult;
+ info++;
+ }
+ }
+ else
+ {
+ hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;
+ for (unsigned int j = 0; j < num_glyphs; j++)
+ {
+ double advance;
+ if (likely (j + 1 < num_glyphs))
+ advance = positions[j + 1].y - positions[j].y;
+ else /* last glyph */
+ advance = run_advance - (positions[j].y - positions[0].y);
+ info->mask = advance * y_mult;
+ info->var1.i32 = positions[j].x * x_mult;
+ info->var2.i32 = y_offset;
+ info++;
+ }
+ }
+ SCRATCH_RESTORE();
+ advances_so_far += run_advance;
+ }
+#undef SCRATCH_RESTORE
+#undef SCRATCH_SAVE
+#undef USE_PTR
+#undef ALLOCATE_ARRAY
+
+ buffer->len += num_glyphs;
+ }
+
+ /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,
+ * or if it does, it doesn't resepct it. So we get runs with wrong
+ * directions. As such, disable the assert... It wouldn't crash, but
+ * cursoring will be off...
+ *
+ * http://crbug.com/419769
+ */
+ if (0)
+ {
+ /* Make sure all runs had the expected direction. */
+ bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
+ assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
+ assert (bool (status_or & kCTRunStatusRightToLeft) == backward);
+ }
+
+ buffer->clear_positions ();
+
+ unsigned int count = buffer->len;
+ hb_glyph_info_t *info = buffer->info;
+ hb_glyph_position_t *pos = buffer->pos;
+ if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
+ for (unsigned int i = 0; i < count; i++)
+ {
+ pos->x_advance = info->mask;
+ pos->x_offset = info->var1.i32;
+ pos->y_offset = info->var2.i32;
+
+ info->mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
+
+ info++, pos++;
+ }
+ else
+ for (unsigned int i = 0; i < count; i++)
+ {
+ pos->y_advance = info->mask;
+ pos->x_offset = info->var1.i32;
+ pos->y_offset = info->var2.i32;
+
+ info->mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
+
+ info++, pos++;
+ }
+
+ /* Fix up clusters so that we never return out-of-order indices;
+ * if core text has reordered glyphs, we'll merge them to the
+ * beginning of the reordered cluster. CoreText is nice enough
+ * to tell us whenever it has produced nonmonotonic results...
+ * Note that we assume the input clusters were nonmonotonic to
+ * begin with.
+ *
+ * This does *not* mean we'll form the same clusters as Uniscribe
+ * or the native OT backend, only that the cluster indices will be
+ * monotonic in the output buffer. */
+ if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
+ {
+ hb_glyph_info_t *info = buffer->info;
+ if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
+ {
+ unsigned int cluster = info[count - 1].cluster;
+ for (unsigned int i = count - 1; i > 0; i--)
+ {
+ cluster = MIN (cluster, info[i - 1].cluster);
+ info[i - 1].cluster = cluster;
+ }
+ }
+ else
+ {
+ unsigned int cluster = info[0].cluster;
+ for (unsigned int i = 1; i < count; i++)
+ {
+ cluster = MIN (cluster, info[i].cluster);
+ info[i].cluster = cluster;
+ }
+ }
+ }
+ }
+
+ buffer->unsafe_to_break_all ();
+
+#undef FAIL
+
+fail:
+ if (string_ref)
+ CFRelease (string_ref);
+ if (line)
+ CFRelease (line);
+
+ for (unsigned int i = 0; i < range_records.len; i++)
+ if (range_records[i].font)
+ CFRelease (range_records[i].font);
+
+ return ret;
+}
+
+
+/*
+ * AAT shaper
+ */
+
+HB_SHAPER_DATA_ENSURE_DEFINE(coretext_aat, face)
+HB_SHAPER_DATA_ENSURE_DEFINE(coretext_aat, font)
+
+/*
+ * shaper face data
+ */
+
+struct hb_coretext_aat_shaper_face_data_t {};
+
+hb_coretext_aat_shaper_face_data_t *
+_hb_coretext_aat_shaper_face_data_create (hb_face_t *face)
+{
+ static const hb_tag_t tags[] = {HB_CORETEXT_TAG_MORX, HB_CORETEXT_TAG_MORT, HB_CORETEXT_TAG_KERX, HB_CORETEXT_TAG_TRAK};
+
+ // Disable macOS 11 / iOS 14 specific hotfix for Qt on older versions, since it caused a
+ // regression. (Note: This code should not been upstreamed and is only applicable to Qt 5.15.x).
+ NSInteger majorVersion = NSProcessInfo.processInfo.operatingSystemVersion.majorVersion;
+ NSInteger hotfixMinimumVersion;
+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+ hotfixMinimumVersion = 14;
+#else
+ hotfixMinimumVersion = 11;
+#endif
+
+ unsigned int arrayLength = ARRAY_LENGTH (tags);
+ if (majorVersion < hotfixMinimumVersion)
+ arrayLength--;
+
+ for (unsigned int i = 0; i < arrayLength; i++)
+ {
+ hb_blob_t *blob = face->reference_table (tags[i]);
+ if (hb_blob_get_length (blob))
+ {
+ hb_blob_destroy (blob);
+ return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : nullptr;
+ }
+ hb_blob_destroy (blob);
+ }
+
+ return nullptr;
+}
+
+void
+_hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED)
+{
+}
+
+
+/*
+ * shaper font data
+ */
+
+struct hb_coretext_aat_shaper_font_data_t {};
+
+hb_coretext_aat_shaper_font_data_t *
+_hb_coretext_aat_shaper_font_data_create (hb_font_t *font)
+{
+ return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : nullptr;
+}
+
+void
+_hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED)
+{
+}
+
+
+/*
+ * shaper shape_plan data
+ */
+
+struct hb_coretext_aat_shaper_shape_plan_data_t {};
+
+hb_coretext_aat_shaper_shape_plan_data_t *
+_hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED,
+ const hb_feature_t *user_features HB_UNUSED,
+ unsigned int num_user_features HB_UNUSED,
+ const int *coords HB_UNUSED,
+ unsigned int num_coords HB_UNUSED)
+{
+ return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
+}
+
+void
+_hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED)
+{
+}
+
+
+/*
+ * shaper
+ */
+
+hb_bool_t
+_hb_coretext_aat_shape (hb_shape_plan_t *shape_plan,
+ hb_font_t *font,
+ hb_buffer_t *buffer,
+ const hb_feature_t *features,
+ unsigned int num_features)
+{
+ return _hb_coretext_shape (shape_plan, font, buffer, features, num_features);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 19:52:30 +0000