blob: 4222e0691621c37ca9a576518de1f7d67a9fa559 [file] [log] [blame]
/*
* Copyright © 2015-2016 Ebrahim Byagowi
*
* 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.
*/
#define HB_SHAPER directwrite
#include "hb-shaper-impl-private.hh"
#include <dwrite.h>
#include "hb-directwrite.h"
#include "hb-open-file-private.hh"
#include "hb-ot-name-table.hh"
#include "hb-ot-tag.h"
#ifndef HB_DEBUG_DIRECTWRITE
#define HB_DEBUG_DIRECTWRITE (HB_DEBUG+0)
#endif
HB_SHAPER_DATA_ENSURE_DECLARE(directwrite, face)
HB_SHAPER_DATA_ENSURE_DECLARE(directwrite, font)
/*
* shaper face data
*/
struct hb_directwrite_shaper_face_data_t {
HANDLE fh;
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);
ASSERT_STATIC (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 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_directwrite_shaper_face_data_t *
_hb_directwrite_shaper_face_data_create(hb_face_t *face)
{
hb_directwrite_shaper_face_data_t *data = (hb_directwrite_shaper_face_data_t *)calloc(1, sizeof (hb_directwrite_shaper_face_data_t));
if (unlikely (!data))
return NULL;
hb_blob_t *blob = hb_face_reference_blob (face);
if (unlikely (!hb_blob_get_length (blob)))
DEBUG_MSG(DIRECTWRITE, 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 (DIRECTWRITE, face, "Face AddFontMemResourceEx() failed");
free (data);
return NULL;
}
return data;
}
void
_hb_directwrite_shaper_face_data_destroy(hb_directwrite_shaper_face_data_t *data)
{
RemoveFontMemResourceEx(data->fh);
free(data);
}
/*
* shaper font data
*/
struct hb_directwrite_shaper_font_data_t {
HDC hdc;
LOGFONTW log_font;
HFONT hfont;
};
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_directwrite_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName));
return true;
}
hb_directwrite_shaper_font_data_t *
_hb_directwrite_shaper_font_data_create (hb_font_t *font)
{
if (unlikely (!hb_directwrite_shaper_face_data_ensure (font->face))) return NULL;
hb_directwrite_shaper_font_data_t *data = (hb_directwrite_shaper_font_data_t *) calloc (1, sizeof (hb_directwrite_shaper_font_data_t));
if (unlikely (!data))
return NULL;
data->hdc = GetDC (NULL);
if (unlikely (!populate_log_font (&data->log_font, font))) {
DEBUG_MSG (DIRECTWRITE, font, "Font populate_log_font() failed");
_hb_directwrite_shaper_font_data_destroy (data);
return NULL;
}
data->hfont = CreateFontIndirectW (&data->log_font);
if (unlikely (!data->hfont)) {
DEBUG_MSG (DIRECTWRITE, font, "Font CreateFontIndirectW() failed");
_hb_directwrite_shaper_font_data_destroy (data);
return NULL;
}
if (!SelectObject (data->hdc, data->hfont)) {
DEBUG_MSG (DIRECTWRITE, font, "Font SelectObject() failed");
_hb_directwrite_shaper_font_data_destroy (data);
return NULL;
}
return data;
}
void
_hb_directwrite_shaper_font_data_destroy (hb_directwrite_shaper_font_data_t *data)
{
if (data->hdc)
ReleaseDC (NULL, data->hdc);
if (data->hfont)
DeleteObject (data->hfont);
free (data);
}
LOGFONTW *
hb_directwrite_font_get_logfontw (hb_font_t *font)
{
if (unlikely (!hb_directwrite_shaper_font_data_ensure (font))) return NULL;
hb_directwrite_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
return &font_data->log_font;
}
HFONT
hb_directwrite_font_get_hfont (hb_font_t *font)
{
if (unlikely (!hb_directwrite_shaper_font_data_ensure (font))) return NULL;
hb_directwrite_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
return font_data->hfont;
}
/*
* shaper shape_plan data
*/
struct hb_directwrite_shaper_shape_plan_data_t {};
hb_directwrite_shaper_shape_plan_data_t *
_hb_directwrite_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_directwrite_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_directwrite_shaper_shape_plan_data_destroy (hb_directwrite_shaper_shape_plan_data_t *data HB_UNUSED)
{
}
// Most of here TextAnalysis is originally written by Bas Schouten for Mozilla project
// but now is relicensed to MIT for HarfBuzz use
class TextAnalysis
: public IDWriteTextAnalysisSource, public IDWriteTextAnalysisSink
{
public:
IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) { return S_OK; }
IFACEMETHOD_(ULONG, AddRef)() { return 1; }
IFACEMETHOD_(ULONG, Release)() { return 1; }
// A single contiguous run of characters containing the same analysis
// results.
struct Run
{
UINT32 mTextStart; // starting text position of this run
UINT32 mTextLength; // number of contiguous code units covered
UINT32 mGlyphStart; // starting glyph in the glyphs array
UINT32 mGlyphCount; // number of glyphs associated with this run of
// text
DWRITE_SCRIPT_ANALYSIS mScript;
UINT8 mBidiLevel;
bool mIsSideways;
inline bool ContainsTextPosition(UINT32 aTextPosition) const
{
return aTextPosition >= mTextStart
&& aTextPosition < mTextStart + mTextLength;
}
Run *nextRun;
};
public:
TextAnalysis(const wchar_t* text,
UINT32 textLength,
const wchar_t* localeName,
DWRITE_READING_DIRECTION readingDirection)
: mText(text)
, mTextLength(textLength)
, mLocaleName(localeName)
, mReadingDirection(readingDirection)
, mCurrentRun(NULL) { };
~TextAnalysis() {
// delete runs, except mRunHead which is part of the TextAnalysis object
for (Run *run = mRunHead.nextRun; run;) {
Run *origRun = run;
run = run->nextRun;
free (origRun);
}
}
STDMETHODIMP GenerateResults(IDWriteTextAnalyzer* textAnalyzer,
Run **runHead) {
// Analyzes the text using the script analyzer and returns
// the result as a series of runs.
HRESULT hr = S_OK;
// Initially start out with one result that covers the entire range.
// This result will be subdivided by the analysis processes.
mRunHead.mTextStart = 0;
mRunHead.mTextLength = mTextLength;
mRunHead.mBidiLevel =
(mReadingDirection == DWRITE_READING_DIRECTION_RIGHT_TO_LEFT);
mRunHead.nextRun = NULL;
mCurrentRun = &mRunHead;
// Call each of the analyzers in sequence, recording their results.
if (SUCCEEDED(hr = textAnalyzer->AnalyzeScript(this,
0,
mTextLength,
this))) {
*runHead = &mRunHead;
}
return hr;
}
// IDWriteTextAnalysisSource implementation
IFACEMETHODIMP GetTextAtPosition(UINT32 textPosition,
OUT WCHAR const** textString,
OUT UINT32* textLength)
{
if (textPosition >= mTextLength) {
// No text at this position, valid query though.
*textString = NULL;
*textLength = 0;
}
else {
*textString = mText + textPosition;
*textLength = mTextLength - textPosition;
}
return S_OK;
}
IFACEMETHODIMP GetTextBeforePosition(UINT32 textPosition,
OUT WCHAR const** textString,
OUT UINT32* textLength)
{
if (textPosition == 0 || textPosition > mTextLength) {
// Either there is no text before here (== 0), or this
// is an invalid position. The query is considered valid thouh.
*textString = NULL;
*textLength = 0;
}
else {
*textString = mText;
*textLength = textPosition;
}
return S_OK;
}
IFACEMETHODIMP_(DWRITE_READING_DIRECTION)
GetParagraphReadingDirection() { return mReadingDirection; }
IFACEMETHODIMP GetLocaleName(UINT32 textPosition,
UINT32* textLength,
WCHAR const** localeName) {
return S_OK;
}
IFACEMETHODIMP
GetNumberSubstitution(UINT32 textPosition,
OUT UINT32* textLength,
OUT IDWriteNumberSubstitution** numberSubstitution)
{
// We do not support number substitution.
*numberSubstitution = NULL;
*textLength = mTextLength - textPosition;
return S_OK;
}
// IDWriteTextAnalysisSink implementation
IFACEMETHODIMP
SetScriptAnalysis(UINT32 textPosition,
UINT32 textLength,
DWRITE_SCRIPT_ANALYSIS const* scriptAnalysis)
{
SetCurrentRun(textPosition);
SplitCurrentRun(textPosition);
while (textLength > 0) {
Run *run = FetchNextRun(&textLength);
run->mScript = *scriptAnalysis;
}
return S_OK;
}
IFACEMETHODIMP
SetLineBreakpoints(UINT32 textPosition,
UINT32 textLength,
const DWRITE_LINE_BREAKPOINT* lineBreakpoints) { return S_OK; }
IFACEMETHODIMP SetBidiLevel(UINT32 textPosition,
UINT32 textLength,
UINT8 explicitLevel,
UINT8 resolvedLevel) { return S_OK; }
IFACEMETHODIMP
SetNumberSubstitution(UINT32 textPosition,
UINT32 textLength,
IDWriteNumberSubstitution* numberSubstitution) { return S_OK; }
protected:
Run *FetchNextRun(IN OUT UINT32* textLength)
{
// Used by the sink setters, this returns a reference to the next run.
// Position and length are adjusted to now point after the current run
// being returned.
Run *origRun = mCurrentRun;
// Split the tail if needed (the length remaining is less than the
// current run's size).
if (*textLength < mCurrentRun->mTextLength) {
SplitCurrentRun(mCurrentRun->mTextStart + *textLength);
}
else {
// Just advance the current run.
mCurrentRun = mCurrentRun->nextRun;
}
*textLength -= origRun->mTextLength;
// Return a reference to the run that was just current.
return origRun;
}
void SetCurrentRun(UINT32 textPosition)
{
// Move the current run to the given position.
// Since the analyzers generally return results in a forward manner,
// this will usually just return early. If not, find the
// corresponding run for the text position.
if (mCurrentRun && mCurrentRun->ContainsTextPosition(textPosition)) {
return;
}
for (Run *run = &mRunHead; run; run = run->nextRun) {
if (run->ContainsTextPosition(textPosition)) {
mCurrentRun = run;
return;
}
}
//NS_NOTREACHED("We should always be able to find the text position in one \
// of our runs");
}
void SplitCurrentRun(UINT32 splitPosition)
{
if (!mCurrentRun) {
//NS_ASSERTION(false, "SplitCurrentRun called without current run.");
// Shouldn't be calling this when no current run is set!
return;
}
// Split the current run.
if (splitPosition <= mCurrentRun->mTextStart) {
// No need to split, already the start of a run
// or before it. Usually the first.
return;
}
Run *newRun = (Run*) malloc (sizeof (Run));
*newRun = *mCurrentRun;
// Insert the new run in our linked list.
newRun->nextRun = mCurrentRun->nextRun;
mCurrentRun->nextRun = newRun;
// Adjust runs' text positions and lengths.
UINT32 splitPoint = splitPosition - mCurrentRun->mTextStart;
newRun->mTextStart += splitPoint;
newRun->mTextLength -= splitPoint;
mCurrentRun->mTextLength = splitPoint;
mCurrentRun = newRun;
}
protected:
// Input
// (weak references are fine here, since this class is a transient
// stack-based helper that doesn't need to copy data)
UINT32 mTextLength;
const WCHAR* mText;
const WCHAR* mLocaleName;
DWRITE_READING_DIRECTION mReadingDirection;
// Current processing state.
Run *mCurrentRun;
// Output is a list of runs starting here
Run mRunHead;
};
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); }
/*
* shaper
*/
hb_bool_t
_hb_directwrite_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_directwrite_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
hb_directwrite_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
// factory probably should be cached
IDWriteFactory* dwriteFactory;
DWriteCreateFactory(
DWRITE_FACTORY_TYPE_SHARED,
__uuidof(IDWriteFactory),
reinterpret_cast<IUnknown**>(&dwriteFactory)
);
IDWriteGdiInterop *gdiInterop;
dwriteFactory->GetGdiInterop (&gdiInterop);
IDWriteFontFace* fontFace;
gdiInterop->CreateFontFaceFromHdc (font_data->hdc, &fontFace);
IDWriteTextAnalyzer* analyzer;
dwriteFactory->CreateTextAnalyzer (&analyzer);
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);
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. */
}
}
HRESULT hr;
// TODO: Handle TEST_DISABLE_OPTIONAL_LIGATURES
DWRITE_READING_DIRECTION readingDirection = buffer->props.direction ?
DWRITE_READING_DIRECTION_RIGHT_TO_LEFT :
DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
/*
* There's an internal 16-bit limit on some things inside the analyzer,
* but we never attempt to shape a word longer than 64K characters
* in a single gfxShapedWord, so we cannot exceed that limit.
*/
UINT32 length = buffer->len;
TextAnalysis analysis(pchars, length, NULL, readingDirection);
TextAnalysis::Run *runHead;
hr = analysis.GenerateResults(analyzer, &runHead);
#define FAIL(...) \
HB_STMT_START { \
DEBUG_MSG (DIRECTWRITE, NULL, __VA_ARGS__); \
return false; \
} HB_STMT_END;
if (FAILED (hr)) {
FAIL ("Analyzer failed to generate results.");
return false;
}
UINT32 maxGlyphs = 3 * length / 2 + 16;
UINT32 actualGlyphs;
bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
const wchar_t lang[20] = {0};
if (buffer->props.language != NULL) {
mbstowcs ((wchar_t*) lang, hb_language_to_string (buffer->props.language), 20);
}
retry_getglyphs:
UINT16* clusters = (UINT16*) malloc (maxGlyphs * sizeof (UINT16));
UINT16* glyphs = (UINT16*) malloc (maxGlyphs * sizeof (UINT16));
DWRITE_SHAPING_TEXT_PROPERTIES* textProperties = (DWRITE_SHAPING_TEXT_PROPERTIES*)
malloc (maxGlyphs * sizeof (DWRITE_SHAPING_TEXT_PROPERTIES));
DWRITE_SHAPING_GLYPH_PROPERTIES* glyphProperties = (DWRITE_SHAPING_GLYPH_PROPERTIES*)
malloc (maxGlyphs * sizeof (DWRITE_SHAPING_GLYPH_PROPERTIES));
DWRITE_TYPOGRAPHIC_FEATURES dwfeatures;
dwfeatures.featureCount = num_features;
if (num_features != 0)
{
DWRITE_FONT_FEATURE* dwfeatureArray = (DWRITE_FONT_FEATURE*)
malloc (sizeof (DWRITE_FONT_FEATURE) * num_features);
for (unsigned int i = 0; i < num_features; ++i)
{
dwfeatureArray[i].nameTag = (DWRITE_FONT_FEATURE_TAG)
hb_uint32_swap (features[i].tag);
dwfeatureArray[i].parameter = features[i].value;
}
dwfeatures.features = dwfeatureArray;
}
const DWRITE_TYPOGRAPHIC_FEATURES* dwfeaturesArray =
(const DWRITE_TYPOGRAPHIC_FEATURES*) &dwfeatures;
const UINT32 featuresLength[] = {length};
hr = analyzer->GetGlyphs (pchars, length,
fontFace, FALSE,
backward,
&runHead->mScript, lang, NULL, &dwfeaturesArray, featuresLength, 1,
maxGlyphs, clusters, textProperties,
glyphs, glyphProperties, &actualGlyphs);
if (unlikely (hr == HRESULT_FROM_WIN32 (ERROR_INSUFFICIENT_BUFFER))) {
free (clusters);
free (glyphs);
free (textProperties);
free (glyphProperties);
maxGlyphs *= 2;
goto retry_getglyphs;
}
if (FAILED (hr)) {
FAIL ("Analyzer failed to get glyphs.");
return false;
}
FLOAT* advances = (FLOAT*) malloc (actualGlyphs * sizeof (FLOAT));
DWRITE_GLYPH_OFFSET* offsets = (DWRITE_GLYPH_OFFSET*)
malloc(actualGlyphs * sizeof (DWRITE_GLYPH_OFFSET));
/* 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) +
4 + // sizeof (SCRIPT_GLYPHPROP) +
sizeof (int) +
8 + // sizeof (GOFFSET) +
sizeof (uint32_t));
ALLOCATE_ARRAY(uint32_t, vis_clusters, glyphs_size);
#undef ALLOCATE_ARRAY
int fontSize = font->face->get_upem();
if (fontSize < 0)
fontSize = -fontSize;
if (fontSize < 0)
fontSize = -fontSize;
double x_mult = (double) font->x_scale / fontSize;
double y_mult = (double) font->y_scale / fontSize;
hr = analyzer->GetGlyphPlacements (pchars,
clusters,
textProperties,
length,
glyphs,
glyphProperties,
actualGlyphs,
fontFace,
fontSize,
FALSE,
backward,
&runHead->mScript,
lang,
&dwfeaturesArray,
featuresLength,
1,
advances,
offsets);
if (FAILED (hr)) {
FAIL ("Analyzer failed to get glyph placements.");
return false;
}
/* 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 < actualGlyphs; 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 < actualGlyphs; i++)
if (vis_clusters[i] == -1)
vis_clusters[i] = vis_clusters[i - 1];
#undef utf16_index
if (unlikely (!buffer->ensure (actualGlyphs)))
FAIL ("Buffer in error");
#undef FAIL
/* Set glyph infos */
buffer->len = 0;
for (unsigned int i = 0; i < actualGlyphs; 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].advanceOffset;
info->var2.i32 = offsets[i].ascenderOffset;
}
/* Set glyph positions */
buffer->clear_positions ();
for (unsigned int i = 0; i < actualGlyphs; 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;
}
if (backward)
hb_buffer_reverse (buffer);
free (clusters);
free (glyphs);
free (textProperties);
free (glyphProperties);
free (advances);
free (offsets);
free (dwfeatures.features);
/* Wow, done! */
return true;
}