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harfbuzz/src/hb-uniscribe.cc

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/*
* 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 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
static inline uint16_t hb_uint16_swap (const uint16_t v)
{ return (v >> 8) | (v << 8); }
static inline uint32_t hb_uint32_swap (const uint32_t v)
{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
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 = nullptr;
this->ScriptShapeOpenType = nullptr;
this->ScriptPlaceOpenType = nullptr;
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, nullptr, "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 nullptr;
funcs->init ();
if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, nullptr, funcs)) {
free (funcs);
goto retry;
}
#ifdef HB_USE_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_DEFINE(uniscribe, face)
HB_SHAPER_DATA_ENSURE_DEFINE(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);
static_assert ((2 + 3 * (16/2) < LF_FACESIZE), "");
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 nullptr;
}
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 nullptr;
}
}
/* 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, nullptr, 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 nullptr;
data->funcs = hb_uniscribe_shaper_get_funcs ();
if (unlikely (!data->funcs))
{
free (data);
return nullptr;
}
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 nullptr;
}
DWORD num_fonts_installed;
data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, nullptr),
hb_blob_get_length (blob),
0, &num_fonts_installed);
if (unlikely (!data->fh))
{
DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed");
free (data);
return nullptr;
}
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;
double x_mult, y_mult; /* From LOGFONT space to HB space. */
};
static bool
populate_log_font (LOGFONTW *lf,
hb_font_t *font,
unsigned int font_size)
{
memset (lf, 0, sizeof (*lf));
lf->lfHeight = -font_size;
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 nullptr;
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 nullptr;
int font_size = font->face->get_upem (); /* Default... */
/* No idea if the following is even a good idea. */
if (font->y_ppem)
font_size = font->y_ppem;
if (font_size < 0)
font_size = -font_size;
data->x_mult = (double) font->x_scale / font_size;
data->y_mult = (double) font->y_scale / font_size;
data->hdc = GetDC (nullptr);
if (unlikely (!populate_log_font (&data->log_font, font, font_size))) {
DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed");
_hb_uniscribe_shaper_font_data_destroy (data);
return nullptr;
}
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 nullptr;
}
if (!SelectObject (data->hdc, data->hfont)) {
DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed");
_hb_uniscribe_shaper_font_data_destroy (data);
return nullptr;
}
return data;
}
void
_hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data)
{
if (data->hdc)
ReleaseDC (nullptr, 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 nullptr;
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 nullptr;
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,
const int *coords HB_UNUSED,
unsigned int num_coords 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, nullptr, __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) & ((1u << 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 |= 1u<<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 || hr == E_NOT_SUFFICIENT_BUFFER))
{
if (unlikely (!buffer->ensure (buffer->allocated * 2)))
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,
nullptr);
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
if (unlikely (!buffer->ensure (glyphs_len)))
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.i32 = offsets[i].du;
info->var2.i32 = offsets[i].dv;
}
/* Set glyph positions */
buffer->clear_positions ();
double x_mult = font_data->x_mult, y_mult = font_data->y_mult;
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 = x_mult * (int32_t) info->mask;
pos->x_offset = x_mult * (backward ? -info->var1.i32 : info->var1.i32);
pos->y_offset = y_mult * info->var2.i32;
info->mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
}
if (backward)
hb_buffer_reverse (buffer);
/* Wow, done! */
return true;
}
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