diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-0.9.32/src/hb-uniscribe.cc')
| -rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-0.9.32/src/hb-uniscribe.cc | 1019 |
1 files changed, 1019 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-0.9.32/src/hb-uniscribe.cc b/Build/source/libs/harfbuzz/harfbuzz-0.9.32/src/hb-uniscribe.cc new file mode 100644 index 00000000000..6bdf0f5c7fa --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-0.9.32/src/hb-uniscribe.cc @@ -0,0 +1,1019 @@ +/* + * Copyright © 2011,2012,2013 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#define _WIN32_WINNT 0x0600 +#define WIN32_LEAN_AND_MEAN + +#define HB_SHAPER uniscribe +#include "hb-shaper-impl-private.hh" + +#include <windows.h> +#include <usp10.h> +#include <rpc.h> + +#include "hb-uniscribe.h" + +#include "hb-open-file-private.hh" +#include "hb-ot-name-table.hh" +#include "hb-ot-tag.h" + + +#ifndef HB_DEBUG_UNISCRIBE +#define HB_DEBUG_UNISCRIBE (HB_DEBUG+0) +#endif + + +typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/( + const WCHAR *pwcInChars, + int cInChars, + int cMaxItems, + const SCRIPT_CONTROL *psControl, + const SCRIPT_STATE *psState, + SCRIPT_ITEM *pItems, + OPENTYPE_TAG *pScriptTags, + int *pcItems +); + +typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/( + HDC hdc, + SCRIPT_CACHE *psc, + SCRIPT_ANALYSIS *psa, + OPENTYPE_TAG tagScript, + OPENTYPE_TAG tagLangSys, + int *rcRangeChars, + TEXTRANGE_PROPERTIES **rpRangeProperties, + int cRanges, + const WCHAR *pwcChars, + int cChars, + int cMaxGlyphs, + WORD *pwLogClust, + SCRIPT_CHARPROP *pCharProps, + WORD *pwOutGlyphs, + SCRIPT_GLYPHPROP *pOutGlyphProps, + int *pcGlyphs +); + +typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/( + HDC hdc, + SCRIPT_CACHE *psc, + SCRIPT_ANALYSIS *psa, + OPENTYPE_TAG tagScript, + OPENTYPE_TAG tagLangSys, + int *rcRangeChars, + TEXTRANGE_PROPERTIES **rpRangeProperties, + int cRanges, + const WCHAR *pwcChars, + WORD *pwLogClust, + SCRIPT_CHARPROP *pCharProps, + int cChars, + const WORD *pwGlyphs, + const SCRIPT_GLYPHPROP *pGlyphProps, + int cGlyphs, + int *piAdvance, + GOFFSET *pGoffset, + ABC *pABC +); + + +/* Fallback implementations. */ + +static HRESULT WINAPI +hb_ScriptItemizeOpenType( + const WCHAR *pwcInChars, + int cInChars, + int cMaxItems, + const SCRIPT_CONTROL *psControl, + const SCRIPT_STATE *psState, + SCRIPT_ITEM *pItems, + OPENTYPE_TAG *pScriptTags, + int *pcItems +) +{ +{ + return ScriptItemize (pwcInChars, + cInChars, + cMaxItems, + psControl, + psState, + pItems, + pcItems); +} +} + +static HRESULT WINAPI +hb_ScriptShapeOpenType( + HDC hdc, + SCRIPT_CACHE *psc, + SCRIPT_ANALYSIS *psa, + OPENTYPE_TAG tagScript, + OPENTYPE_TAG tagLangSys, + int *rcRangeChars, + TEXTRANGE_PROPERTIES **rpRangeProperties, + int cRanges, + const WCHAR *pwcChars, + int cChars, + int cMaxGlyphs, + WORD *pwLogClust, + SCRIPT_CHARPROP *pCharProps, + WORD *pwOutGlyphs, + SCRIPT_GLYPHPROP *pOutGlyphProps, + int *pcGlyphs +) +{ + SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps; + return ScriptShape (hdc, + psc, + pwcChars, + cChars, + cMaxGlyphs, + psa, + pwOutGlyphs, + pwLogClust, + psva, + pcGlyphs); +} + +static HRESULT WINAPI +hb_ScriptPlaceOpenType( + HDC hdc, + SCRIPT_CACHE *psc, + SCRIPT_ANALYSIS *psa, + OPENTYPE_TAG tagScript, + OPENTYPE_TAG tagLangSys, + int *rcRangeChars, + TEXTRANGE_PROPERTIES **rpRangeProperties, + int cRanges, + const WCHAR *pwcChars, + WORD *pwLogClust, + SCRIPT_CHARPROP *pCharProps, + int cChars, + const WORD *pwGlyphs, + const SCRIPT_GLYPHPROP *pGlyphProps, + int cGlyphs, + int *piAdvance, + GOFFSET *pGoffset, + ABC *pABC +) +{ + SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps; + return ScriptPlace (hdc, + psc, + pwGlyphs, + cGlyphs, + psva, + psa, + piAdvance, + pGoffset, + pABC); +} + + +struct hb_uniscribe_shaper_funcs_t { + SIOT ScriptItemizeOpenType; + SSOT ScriptShapeOpenType; + SPOT ScriptPlaceOpenType; + + inline void init (void) + { + HMODULE hinstLib; + this->ScriptItemizeOpenType = NULL; + this->ScriptShapeOpenType = NULL; + this->ScriptPlaceOpenType = NULL; + + hinstLib = GetModuleHandle (TEXT ("usp10.dll")); + if (hinstLib) + { + this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType"); + this->ScriptShapeOpenType = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType"); + this->ScriptPlaceOpenType = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType"); + } + if (!this->ScriptItemizeOpenType || + !this->ScriptShapeOpenType || + !this->ScriptPlaceOpenType) + { + DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back."); + this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType; + this->ScriptShapeOpenType = hb_ScriptShapeOpenType; + this->ScriptPlaceOpenType = hb_ScriptPlaceOpenType; + } + } +}; +static hb_uniscribe_shaper_funcs_t *uniscribe_funcs; + +static inline void +free_uniscribe_funcs (void) +{ + free (uniscribe_funcs); +} + +static hb_uniscribe_shaper_funcs_t * +hb_uniscribe_shaper_get_funcs (void) +{ +retry: + hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs); + + if (unlikely (!funcs)) + { + funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t)); + if (unlikely (!funcs)) + return NULL; + + funcs->init (); + + if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) { + free (funcs); + goto retry; + } + +#ifdef HAVE_ATEXIT + atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */ +#endif + } + + return funcs; +} + + +struct active_feature_t { + OPENTYPE_FEATURE_RECORD rec; + unsigned int order; + + static int cmp (const active_feature_t *a, const active_feature_t *b) { + return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 : + a->order < b->order ? -1 : a->order > b->order ? 1 : + a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 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 feature_event_t *a, const feature_event_t *b) { + 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 { + TEXTRANGE_PROPERTIES props; + unsigned int index_first; /* == start */ + unsigned int index_last; /* == end - 1 */ +}; + +HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face) +HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font) + + +/* + * shaper face data + */ + +struct hb_uniscribe_shaper_face_data_t { + HANDLE fh; + hb_uniscribe_shaper_funcs_t *funcs; + wchar_t face_name[LF_FACESIZE]; +}; + +/* face_name should point to a wchar_t[LF_FACESIZE] object. */ +static void +_hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen) +{ + /* We'll create a private name for the font from a UUID using a simple, + * somewhat base64-like encoding scheme */ + const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-"; + UUID id; + UuidCreate ((UUID*) &id); + unsigned int name_str_len = 0; + face_name[name_str_len++] = 'F'; + face_name[name_str_len++] = '_'; + unsigned char *p = (unsigned char *) &id; + for (unsigned int i = 0; i < 16; i += 2) + { + /* Spread the 16 bits from two bytes of the UUID across three chars of face_name, + * using the bits in groups of 5,5,6 to select chars from enc. + * This will generate 24 characters; with the 'F_' prefix we already provided, + * the name will be 26 chars (plus the NUL terminator), so will always fit within + * face_name (LF_FACESIZE = 32). */ + face_name[name_str_len++] = enc[p[i] >> 3]; + face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f]; + face_name[name_str_len++] = enc[p[i + 1] & 0x3f]; + } + face_name[name_str_len] = 0; + if (plen) + *plen = name_str_len; +} + +/* Destroys blob. */ +static hb_blob_t * +_hb_rename_font (hb_blob_t *blob, wchar_t *new_name) +{ + /* Create a copy of the font data, with the 'name' table replaced by a + * table that names the font with our private F_* name created above. + * For simplicity, we just append a new 'name' table and update the + * sfnt directory; the original table is left in place, but unused. + * + * The new table will contain just 5 name IDs: family, style, unique, + * full, PS. All of them point to the same name data with our unique name. + */ + + blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob); + + unsigned int length, new_length, name_str_len; + const char *orig_sfnt_data = hb_blob_get_data (blob, &length); + + _hb_generate_unique_face_name (new_name, &name_str_len); + + static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 }; + + unsigned int name_table_length = OT::name::min_size + + ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size + + name_str_len * 2; /* for name data in UTF16BE form */ + unsigned int name_table_offset = (length + 3) & ~3; + + new_length = name_table_offset + ((name_table_length + 3) & ~3); + void *new_sfnt_data = calloc (1, new_length); + if (!new_sfnt_data) + { + hb_blob_destroy (blob); + return NULL; + } + + memcpy(new_sfnt_data, orig_sfnt_data, length); + + OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset); + name.format.set (0); + name.count.set (ARRAY_LENGTH (name_IDs)); + name.stringOffset.set (name.get_size ()); + for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++) + { + OT::NameRecord &record = name.nameRecord[i]; + record.platformID.set (3); + record.encodingID.set (1); + record.languageID.set (0x0409u); /* English */ + record.nameID.set (name_IDs[i]); + record.length.set (name_str_len * 2); + record.offset.set (0); + } + + /* Copy string data from new_name, converting wchar_t to UTF16BE. */ + unsigned char *p = &OT::StructAfter<unsigned char> (name); + for (unsigned int i = 0; i < name_str_len; i++) + { + *p++ = new_name[i] >> 8; + *p++ = new_name[i] & 0xff; + } + + /* Adjust name table entry to point to new name table */ + const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data); + unsigned int face_count = file.get_face_count (); + for (unsigned int face_index = 0; face_index < face_count; face_index++) + { + /* Note: doing multiple edits (ie. TTC) can be unsafe. There may be + * toe-stepping. But we don't really care. */ + const OT::OpenTypeFontFace &face = file.get_face (face_index); + unsigned int index; + if (face.find_table_index (HB_OT_TAG_name, &index)) + { + OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index)); + record.checkSum.set_for_data (&name, name_table_length); + record.offset.set (name_table_offset); + record.length.set (name_table_length); + } + else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */ + { + free (new_sfnt_data); + hb_blob_destroy (blob); + return NULL; + } + } + + /* The checkSumAdjustment field in the 'head' table is now wrong, + * but that doesn't actually seem to cause any problems so we don't + * bother. */ + + hb_blob_destroy (blob); + return hb_blob_create ((const char *) new_sfnt_data, new_length, + HB_MEMORY_MODE_WRITABLE, NULL, free); +} + +hb_uniscribe_shaper_face_data_t * +_hb_uniscribe_shaper_face_data_create (hb_face_t *face) +{ + hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t)); + if (unlikely (!data)) + return NULL; + + data->funcs = hb_uniscribe_shaper_get_funcs (); + if (unlikely (!data->funcs)) + { + free (data); + return NULL; + } + + hb_blob_t *blob = hb_face_reference_blob (face); + if (unlikely (!hb_blob_get_length (blob))) + DEBUG_MSG (UNISCRIBE, face, "Face has empty blob"); + + blob = _hb_rename_font (blob, data->face_name); + if (unlikely (!blob)) + { + free (data); + return NULL; + } + + DWORD num_fonts_installed; + data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL), + hb_blob_get_length (blob), + 0, &num_fonts_installed); + if (unlikely (!data->fh)) + { + DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed"); + free (data); + return NULL; + } + + return data; +} + +void +_hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data) +{ + RemoveFontMemResourceEx (data->fh); + free (data); +} + + +/* + * shaper font data + */ + +struct hb_uniscribe_shaper_font_data_t { + HDC hdc; + LOGFONTW log_font; + HFONT hfont; + SCRIPT_CACHE script_cache; +}; + +static bool +populate_log_font (LOGFONTW *lf, + hb_font_t *font) +{ + memset (lf, 0, sizeof (*lf)); + lf->lfHeight = -font->y_scale; + lf->lfCharSet = DEFAULT_CHARSET; + + hb_face_t *face = font->face; + hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + + memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName)); + + return true; +} + +hb_uniscribe_shaper_font_data_t * +_hb_uniscribe_shaper_font_data_create (hb_font_t *font) +{ + if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL; + + hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t)); + if (unlikely (!data)) + return NULL; + + data->hdc = GetDC (NULL); + + if (unlikely (!populate_log_font (&data->log_font, font))) { + DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed"); + _hb_uniscribe_shaper_font_data_destroy (data); + return NULL; + } + + data->hfont = CreateFontIndirectW (&data->log_font); + if (unlikely (!data->hfont)) { + DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed"); + _hb_uniscribe_shaper_font_data_destroy (data); + return NULL; + } + + if (!SelectObject (data->hdc, data->hfont)) { + DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed"); + _hb_uniscribe_shaper_font_data_destroy (data); + return NULL; + } + + return data; +} + +void +_hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data) +{ + if (data->hdc) + ReleaseDC (NULL, data->hdc); + if (data->hfont) + DeleteObject (data->hfont); + if (data->script_cache) + ScriptFreeCache (&data->script_cache); + free (data); +} + +LOGFONTW * +hb_uniscribe_font_get_logfontw (hb_font_t *font) +{ + if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; + hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + return &font_data->log_font; +} + +HFONT +hb_uniscribe_font_get_hfont (hb_font_t *font) +{ + if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL; + hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + return font_data->hfont; +} + + +/* + * shaper shape_plan data + */ + +struct hb_uniscribe_shaper_shape_plan_data_t {}; + +hb_uniscribe_shaper_shape_plan_data_t * +_hb_uniscribe_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) +{ + return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; +} + +void +_hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED) +{ +} + + +/* + * shaper + */ + + +hb_bool_t +_hb_uniscribe_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; + hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face); + hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font); + hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs; + + /* + * Set up features. + */ + hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records; + hb_auto_array_t<range_record_t> range_records; + 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++) + { + active_feature_t feature; + feature.rec.tagFeature = hb_uint32_swap (features[i].tag); + feature.rec.lParameter = features[i].value; + 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.tagFeature = 0; + feature.rec.lParameter = 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; + + unsigned int offset = feature_records.len; + + active_features.qsort (); + for (unsigned int j = 0; j < active_features.len; j++) + { + if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature) + { + OPENTYPE_FEATURE_RECORD *feature = feature_records.push (); + if (unlikely (!feature)) + goto fail_features; + *feature = active_features[j].rec; + } + else + { + /* Overrides value for existing feature. */ + feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter; + } + } + + /* Will convert to pointer after all is ready, since feature_records.array + * may move as we grow it. */ + range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset); + range->props.cotfRecords = feature_records.len - offset; + 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); + } + } + + if (!range_records.len) /* No active feature found. */ + goto fail_features; + + /* Fixup the pointers. */ + for (unsigned int i = 0; i < range_records.len; i++) + { + range_record_t *range = &range_records[i]; + range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords); + } + } + else + { + fail_features: + num_features = 0; + } + +#define FAIL(...) \ + HB_STMT_START { \ + DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \ + return false; \ + } HB_STMT_END; + + HRESULT hr; + +retry: + + unsigned int scratch_size; + hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); + +#define ALLOCATE_ARRAY(Type, name, len) \ + Type *name = (Type *) scratch; \ + { \ + unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ + assert (_consumed <= scratch_size); \ + scratch += _consumed; \ + scratch_size -= _consumed; \ + } + +#define utf16_index() var1.u32 + + ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2); + + unsigned int chars_len = 0; + for (unsigned int i = 0; i < buffer->len; i++) + { + hb_codepoint_t c = buffer->info[i].codepoint; + buffer->info[i].utf16_index() = chars_len; + 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) & ((1 << 10) - 1)); + } + } + + ALLOCATE_ARRAY (WORD, log_clusters, chars_len); + ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len); + + if (num_features) + { + /* Need log_clusters to assign features. */ + 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. */ + } + } + + /* The -2 in the following is to compensate for possible + * alignment needed after the WORD array. sizeof(WORD) == 2. */ + unsigned int glyphs_size = (scratch_size * sizeof (int) - 2) + / (sizeof (WORD) + + sizeof (SCRIPT_GLYPHPROP) + + sizeof (int) + + sizeof (GOFFSET) + + sizeof (uint32_t)); + + ALLOCATE_ARRAY (WORD, glyphs, glyphs_size); + ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size); + ALLOCATE_ARRAY (int, advances, glyphs_size); + ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size); + ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size); + + /* Note: + * We can't touch the contents of glyph_props. Our fallback + * implementations of Shape and Place functions use that buffer + * by casting it to a different type. It works because they + * both agree about it, but if we want to access it here we + * need address that issue first. + */ + +#undef ALLOCATE_ARRAY + +#define MAX_ITEMS 256 + + SCRIPT_ITEM items[MAX_ITEMS + 1]; + SCRIPT_CONTROL bidi_control = {0}; + SCRIPT_STATE bidi_state = {0}; + ULONG script_tags[MAX_ITEMS]; + int item_count; + + /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */ + //bidi_control.fMergeNeutralItems = true; + *(uint32_t*)&bidi_control |= 1<<24; + + bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; + bidi_state.fOverrideDirection = 1; + + hr = funcs->ScriptItemizeOpenType (pchars, + chars_len, + MAX_ITEMS, + &bidi_control, + &bidi_state, + items, + script_tags, + &item_count); + if (unlikely (FAILED (hr))) + FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr); + +#undef MAX_ITEMS + + OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language)); + hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties; + hb_auto_array_t<int> range_char_counts; + + unsigned int glyphs_offset = 0; + unsigned int glyphs_len; + bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); + for (unsigned int i = 0; i < item_count; i++) + { + unsigned int chars_offset = items[i].iCharPos; + unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset; + + if (num_features) + { + range_properties.shrink (0); + range_char_counts.shrink (0); + + range_record_t *last_range = &range_records[0]; + + for (unsigned int k = chars_offset; k < chars_offset + item_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_properties.len || + &range->props != range_properties[range_properties.len - 1]) + { + TEXTRANGE_PROPERTIES **props = range_properties.push (); + int *c = range_char_counts.push (); + if (unlikely (!props || !c)) + { + range_properties.shrink (0); + range_char_counts.shrink (0); + break; + } + *props = &range->props; + *c = 1; + } + else + { + range_char_counts[range_char_counts.len - 1]++; + } + + last_range = range; + } + } + + /* Asking for glyphs in logical order circumvents at least + * one bug in Uniscribe. */ + items[i].a.fLogicalOrder = true; + + retry_shape: + hr = funcs->ScriptShapeOpenType (font_data->hdc, + &font_data->script_cache, + &items[i].a, + script_tags[i], + language_tag, + range_char_counts.array, + range_properties.array, + range_properties.len, + pchars + chars_offset, + item_chars_len, + glyphs_size - glyphs_offset, + /* out */ + log_clusters + chars_offset, + char_props + chars_offset, + glyphs + glyphs_offset, + glyph_props + glyphs_offset, + (int *) &glyphs_len); + + if (unlikely (items[i].a.fNoGlyphIndex)) + FAIL ("ScriptShapeOpenType() set fNoGlyphIndex"); + if (unlikely (hr == E_OUTOFMEMORY)) + { + buffer->ensure (buffer->allocated * 2); + if (buffer->in_error) + FAIL ("Buffer resize failed"); + goto retry; + } + if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT)) + { + if (items[i].a.eScript == SCRIPT_UNDEFINED) + FAIL ("ScriptShapeOpenType() failed: Font doesn't support script"); + items[i].a.eScript = SCRIPT_UNDEFINED; + goto retry_shape; + } + if (unlikely (FAILED (hr))) + { + FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr); + } + + for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++) + log_clusters[j] += glyphs_offset; + + hr = funcs->ScriptPlaceOpenType (font_data->hdc, + &font_data->script_cache, + &items[i].a, + script_tags[i], + language_tag, + range_char_counts.array, + range_properties.array, + range_properties.len, + pchars + chars_offset, + log_clusters + chars_offset, + char_props + chars_offset, + item_chars_len, + glyphs + glyphs_offset, + glyph_props + glyphs_offset, + glyphs_len, + /* out */ + advances + glyphs_offset, + offsets + glyphs_offset, + NULL); + if (unlikely (FAILED (hr))) + FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr); + + if (DEBUG_ENABLED (UNISCRIBE)) + fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n", + i, + items[i].a.fRTL, + items[i].a.fLayoutRTL, + items[i].a.fLogicalOrder, + HB_UNTAG (hb_uint32_swap (script_tags[i]))); + + glyphs_offset += glyphs_len; + } + glyphs_len = glyphs_offset; + + /* Ok, we've got everything we need, now compose output buffer, + * very, *very*, carefully! */ + + /* Calculate visual-clusters. That's what we ship. */ + for (unsigned int i = 0; i < glyphs_len; i++) + vis_clusters[i] = -1; + for (unsigned int i = 0; i < buffer->len; i++) { + uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]]; + *p = MIN (*p, buffer->info[i].cluster); + } + for (unsigned int i = 1; i < glyphs_len; i++) + if (vis_clusters[i] == -1) + vis_clusters[i] = vis_clusters[i - 1]; + +#undef utf16_index + + buffer->ensure (glyphs_len); + if (buffer->in_error) + FAIL ("Buffer in error"); + +#undef FAIL + + /* Set glyph infos */ + buffer->len = 0; + for (unsigned int i = 0; i < glyphs_len; i++) + { + hb_glyph_info_t *info = &buffer->info[buffer->len++]; + + info->codepoint = glyphs[i]; + info->cluster = vis_clusters[i]; + + /* The rest is crap. Let's store position info there for now. */ + info->mask = advances[i]; + info->var1.u32 = offsets[i].du; + info->var2.u32 = offsets[i].dv; + } + + /* Set glyph positions */ + buffer->clear_positions (); + for (unsigned int i = 0; i < glyphs_len; i++) + { + hb_glyph_info_t *info = &buffer->info[i]; + hb_glyph_position_t *pos = &buffer->pos[i]; + + /* TODO vertical */ + pos->x_advance = info->mask; + pos->x_offset = backward ? -info->var1.u32 : info->var1.u32; + pos->y_offset = info->var2.u32; + } + + if (backward) + hb_buffer_reverse (buffer); + + /* Wow, done! */ + return true; +} + + |