/*
* 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_1.h>
#include "hb-directwrite.h"
#ifndef HB_DEBUG_DIRECTWRITE
#define HB_DEBUG_DIRECTWRITE (HB_DEBUG+0)
#endif
HB_SHAPER_DATA_ENSURE_DEFINE(directwrite, face)
HB_SHAPER_DATA_ENSURE_DEFINE(directwrite, font)
/*
* DirectWrite font stream helpers
*/
// This is a font loader which provides only one font (unlike its original design).
// For a better implementation which was also source of this
// and DWriteFontFileStream, have a look at to NativeFontResourceDWrite.cpp in Mozilla
class DWriteFontFileLoader : public IDWriteFontFileLoader
{
private:
IDWriteFontFileStream *mFontFileStream;
public:
DWriteFontFileLoader (IDWriteFontFileStream *fontFileStream) {
mFontFileStream = fontFileStream;
}
// IUnknown interface
IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) { return S_OK; }
IFACEMETHOD_(ULONG, AddRef)() { return 1; }
IFACEMETHOD_(ULONG, Release)() { return 1; }
// IDWriteFontFileLoader methods
virtual HRESULT STDMETHODCALLTYPE CreateStreamFromKey(void const* fontFileReferenceKey,
UINT32 fontFileReferenceKeySize,
OUT IDWriteFontFileStream** fontFileStream)
{
*fontFileStream = mFontFileStream;
return S_OK;
}
};
class DWriteFontFileStream : public IDWriteFontFileStream
{
private:
uint8_t *mData;
uint32_t mSize;
public:
DWriteFontFileStream(uint8_t *aData, uint32_t aSize)
{
mData = aData;
mSize = aSize;
}
// IUnknown interface
IFACEMETHOD(QueryInterface)(IID const& iid, OUT void** ppObject) { return S_OK; }
IFACEMETHOD_(ULONG, AddRef)() { return 1; }
IFACEMETHOD_(ULONG, Release)() { return 1; }
// IDWriteFontFileStream methods
virtual HRESULT STDMETHODCALLTYPE ReadFileFragment(void const** fragmentStart,
UINT64 fileOffset,
UINT64 fragmentSize,
OUT void** fragmentContext)
{
// We are required to do bounds checking.
if (fileOffset + fragmentSize > mSize) {
return E_FAIL;
}
// truncate the 64 bit fileOffset to size_t sized index into mData
size_t index = static_cast<size_t> (fileOffset);
// We should be alive for the duration of this.
*fragmentStart = &mData[index];
*fragmentContext = nullptr;
return S_OK;
}
virtual void STDMETHODCALLTYPE ReleaseFileFragment(void* fragmentContext) { }
virtual HRESULT STDMETHODCALLTYPE GetFileSize(OUT UINT64* fileSize)
{
*fileSize = mSize;
return S_OK;
}
virtual HRESULT STDMETHODCALLTYPE GetLastWriteTime(OUT UINT64* lastWriteTime)
{
return E_NOTIMPL;
}
};
/*
* shaper face data
*/
struct hb_directwrite_shaper_face_data_t {
IDWriteFactory *dwriteFactory;
IDWriteFontFile *fontFile;
IDWriteFontFileStream *fontFileStream;
IDWriteFontFileLoader *fontFileLoader;
IDWriteFontFace *fontFace;
hb_blob_t *faceBlob;
};
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 *) malloc (sizeof (hb_directwrite_shaper_face_data_t));
if (unlikely (!data))
return NULL;
// TODO: factory and fontFileLoader should be cached separately
IDWriteFactory* dwriteFactory;
DWriteCreateFactory (
DWRITE_FACTORY_TYPE_SHARED,
__uuidof (IDWriteFactory),
(IUnknown**) &dwriteFactory
);
HRESULT hr;
hb_blob_t *blob = hb_face_reference_blob (face);
IDWriteFontFileStream *fontFileStream = new DWriteFontFileStream (
(uint8_t*) hb_blob_get_data (blob, NULL), hb_blob_get_length (blob));
IDWriteFontFileLoader *fontFileLoader = new DWriteFontFileLoader (fontFileStream);
dwriteFactory->RegisterFontFileLoader (fontFileLoader);
IDWriteFontFile *fontFile;
uint64_t fontFileKey = 0;
hr = dwriteFactory->CreateCustomFontFileReference (&fontFileKey, sizeof (fontFileKey),
fontFileLoader, &fontFile);
#define FAIL(...) \
HB_STMT_START { \
DEBUG_MSG (DIRECTWRITE, NULL, __VA_ARGS__); \
return false; \
} HB_STMT_END;
if (FAILED (hr)) {
FAIL ("Failed to load font file from data!");
return false;
}
BOOL isSupported;
DWRITE_FONT_FILE_TYPE fileType;
DWRITE_FONT_FACE_TYPE faceType;
UINT32 numberOfFaces;
hr = fontFile->Analyze (&isSupported, &fileType, &faceType, &numberOfFaces);
if (FAILED (hr) || !isSupported) {
FAIL ("Font file is not supported.");
return false;
}
#undef FAIL
IDWriteFontFace *fontFace;
dwriteFactory->CreateFontFace (faceType, 1, &fontFile, 0,
DWRITE_FONT_SIMULATIONS_NONE, &fontFace);
data->dwriteFactory = dwriteFactory;
data->fontFile = fontFile;
data->fontFileStream = fontFileStream;
data->fontFileLoader = fontFileLoader;
data->fontFace = fontFace;
data->faceBlob = blob;
return data;
}
void
_hb_directwrite_shaper_face_data_destroy(hb_directwrite_shaper_face_data_t *data)
{
if (data->fontFace)
data->fontFace->Release ();
if (data->fontFile)
data->fontFile->Release ();
if (data->dwriteFactory) {
if (data->fontFileLoader)
data->dwriteFactory->UnregisterFontFileLoader (data->fontFileLoader);
data->dwriteFactory->Release ();
}
if (data->fontFileLoader)
delete data->fontFileLoader;
if (data->fontFileStream)
delete data->fontFileStream;
if (data->faceBlob)
hb_blob_destroy (data->faceBlob);
if (data)
free (data);
}
/*
* shaper font data
*/
struct hb_directwrite_shaper_font_data_t {
};
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 *) malloc (sizeof (hb_directwrite_shaper_font_data_t));
if (unlikely (!data))
return NULL;
return data;
}
void
_hb_directwrite_shaper_font_data_destroy (hb_directwrite_shaper_font_data_t *data)
{
free (data);
}
/*
* 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,
const int *coords HB_UNUSED,
unsigned int num_coords 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 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_t mTextStart; // starting text position of this run
uint32_t mTextLength; // number of contiguous code units covered
uint32_t mGlyphStart; // starting glyph in the glyphs array
uint32_t mGlyphCount; // number of glyphs associated with this run of
// text
DWRITE_SCRIPT_ANALYSIS mScript;
uint8_t mBidiLevel;
bool mIsSideways;
inline bool ContainsTextPosition(uint32_t aTextPosition) const
{
return aTextPosition >= mTextStart
&& aTextPosition < mTextStart + mTextLength;
}
Run *nextRun;
};
public:
TextAnalysis(const wchar_t* text,
uint32_t 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_t textPosition,
OUT wchar_t const** textString,
OUT uint32_t* 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_t textPosition,
OUT wchar_t const** textString,
OUT uint32_t* 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_t textPosition,
uint32_t* textLength,
wchar_t const** localeName)
{
return S_OK;
}
IFACEMETHODIMP
GetNumberSubstitution(uint32_t textPosition,
OUT uint32_t* textLength,
OUT IDWriteNumberSubstitution** numberSubstitution)
{
// We do not support number substitution.
*numberSubstitution = NULL;
*textLength = mTextLength - textPosition;
return S_OK;
}
// IDWriteTextAnalysisSink implementation
IFACEMETHODIMP
SetScriptAnalysis(uint32_t textPosition,
uint32_t 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_t textPosition,
uint32_t textLength,
const DWRITE_LINE_BREAKPOINT* lineBreakpoints) { return S_OK; }
IFACEMETHODIMP SetBidiLevel(uint32_t textPosition,
uint32_t textLength,
uint8_t explicitLevel,
uint8_t resolvedLevel) { return S_OK; }
IFACEMETHODIMP
SetNumberSubstitution(uint32_t textPosition,
uint32_t textLength,
IDWriteNumberSubstitution* numberSubstitution) { return S_OK; }
protected:
Run *FetchNextRun(IN OUT uint32_t* 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_t 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_t 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_t 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_t mTextLength;
const wchar_t* mText;
const wchar_t* 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
*/
static hb_bool_t
_hb_directwrite_shape_full(hb_shape_plan_t *shape_plan,
hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features,
float lineWidth)
{
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);
IDWriteFactory *dwriteFactory = face_data->dwriteFactory;
IDWriteFontFace *fontFace = face_data->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_t, textString, 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))
textString[chars_len++] = c;
else if (unlikely(c > 0x10FFFFu))
textString[chars_len++] = 0xFFFDu;
else {
textString[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
textString[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1u << 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. */
}
}
// 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_t textLength = buffer->len;
TextAnalysis analysis(textString, textLength, NULL, readingDirection);
TextAnalysis::Run *runHead;
HRESULT hr;
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_t maxGlyphCount = 3 * textLength / 2 + 16;
uint32_t glyphCount;
bool isRightToLeft = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
const wchar_t localeName[20] = {0};
if (buffer->props.language != NULL)
{
mbstowcs ((wchar_t*) localeName,
hb_language_to_string (buffer->props.language), 20);
}
DWRITE_TYPOGRAPHIC_FEATURES singleFeatures;
singleFeatures.featureCount = num_features;
if (num_features)
{
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;
}
singleFeatures.features = dwfeatureArray;
}
const DWRITE_TYPOGRAPHIC_FEATURES* dwFeatures =
(const DWRITE_TYPOGRAPHIC_FEATURES*) &singleFeatures;
const uint32_t featureRangeLengths[] = { textLength };
uint16_t* clusterMap = (uint16_t*) malloc (textLength * sizeof (uint16_t));
DWRITE_SHAPING_TEXT_PROPERTIES* textProperties = (DWRITE_SHAPING_TEXT_PROPERTIES*)
malloc (textLength * sizeof (DWRITE_SHAPING_TEXT_PROPERTIES));
retry_getglyphs:
uint16_t* glyphIndices = (uint16_t*) malloc (maxGlyphCount * sizeof (uint16_t));
DWRITE_SHAPING_GLYPH_PROPERTIES* glyphProperties = (DWRITE_SHAPING_GLYPH_PROPERTIES*)
malloc (maxGlyphCount * sizeof (DWRITE_SHAPING_GLYPH_PROPERTIES));
hr = analyzer->GetGlyphs (textString, textLength, fontFace, false,
isRightToLeft, &runHead->mScript, localeName, NULL, &dwFeatures,
featureRangeLengths, 1, maxGlyphCount, clusterMap, textProperties, glyphIndices,
glyphProperties, &glyphCount);
if (unlikely (hr == HRESULT_FROM_WIN32 (ERROR_INSUFFICIENT_BUFFER)))
{
free (glyphIndices);
free (glyphProperties);
maxGlyphCount *= 2;
goto retry_getglyphs;
}
if (FAILED (hr))
{
FAIL ("Analyzer failed to get glyphs.");
return false;
}
float* glyphAdvances = (float*) malloc (maxGlyphCount * sizeof (float));
DWRITE_GLYPH_OFFSET* glyphOffsets = (DWRITE_GLYPH_OFFSET*)
malloc(maxGlyphCount * 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) +
sizeof(DWRITE_SHAPING_GLYPH_PROPERTIES) +
sizeof(int) +
sizeof(DWRITE_GLYPH_OFFSET) +
sizeof(uint32_t));
ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size);
#undef ALLOCATE_ARRAY
int fontEmSize = font->face->get_upem();
if (fontEmSize < 0)
fontEmSize = -fontEmSize;
if (fontEmSize < 0)
fontEmSize = -fontEmSize;
double x_mult = (double) font->x_scale / fontEmSize;
double y_mult = (double) font->y_scale / fontEmSize;
hr = analyzer->GetGlyphPlacements (textString,
clusterMap, textProperties, textLength, glyphIndices,
glyphProperties, glyphCount, fontFace, fontEmSize,
false, isRightToLeft, &runHead->mScript, localeName,
&dwFeatures, featureRangeLengths, 1,
glyphAdvances, glyphOffsets);
if (FAILED (hr))
{
FAIL ("Analyzer failed to get glyph placements.");
return false;
}
IDWriteTextAnalyzer1* analyzer1;
analyzer->QueryInterface (&analyzer1);
if (analyzer1 && lineWidth)
{
DWRITE_JUSTIFICATION_OPPORTUNITY* justificationOpportunities =
(DWRITE_JUSTIFICATION_OPPORTUNITY*)
malloc (maxGlyphCount * sizeof (DWRITE_JUSTIFICATION_OPPORTUNITY));
hr = analyzer1->GetJustificationOpportunities (fontFace, fontEmSize,
runHead->mScript, textLength, glyphCount, textString, clusterMap,
glyphProperties, justificationOpportunities);
if (FAILED (hr))
{
FAIL ("Analyzer failed to get justification opportunities.");
return false;
}
float* justifiedGlyphAdvances =
(float*) malloc (maxGlyphCount * sizeof (float));
DWRITE_GLYPH_OFFSET* justifiedGlyphOffsets = (DWRITE_GLYPH_OFFSET*)
malloc (glyphCount * sizeof (DWRITE_GLYPH_OFFSET));
hr = analyzer1->JustifyGlyphAdvances (lineWidth, glyphCount, justificationOpportunities,
glyphAdvances, glyphOffsets, justifiedGlyphAdvances, justifiedGlyphOffsets);
if (FAILED (hr))
{
FAIL("Analyzer failed to get justified glyph advances.");
return false;
}
DWRITE_SCRIPT_PROPERTIES scriptProperties;
hr = analyzer1->GetScriptProperties (runHead->mScript, &scriptProperties);
if (FAILED (hr))
{
FAIL("Analyzer failed to get script properties.");
return false;
}
uint32_t justificationCharacter = scriptProperties.justificationCharacter;
// if a script justificationCharacter is not space, it can have GetJustifiedGlyphs
if (justificationCharacter != 32)
{
uint16_t* modifiedClusterMap = (uint16_t*) malloc (textLength * sizeof (uint16_t));
retry_getjustifiedglyphs:
uint16_t* modifiedGlyphIndices = (uint16_t*) malloc (maxGlyphCount * sizeof (uint16_t));
float* modifiedGlyphAdvances = (float*) malloc (maxGlyphCount * sizeof (float));
DWRITE_GLYPH_OFFSET* modifiedGlyphOffsets = (DWRITE_GLYPH_OFFSET*)
malloc (maxGlyphCount * sizeof (DWRITE_GLYPH_OFFSET));
uint32_t actualGlyphsCount;
hr = analyzer1->GetJustifiedGlyphs (fontFace, fontEmSize, runHead->mScript,
textLength, glyphCount, maxGlyphCount, clusterMap, glyphIndices,
glyphAdvances, justifiedGlyphAdvances, justifiedGlyphOffsets,
glyphProperties, &actualGlyphsCount, modifiedClusterMap, modifiedGlyphIndices,
modifiedGlyphAdvances, modifiedGlyphOffsets);
if (hr == HRESULT_FROM_WIN32 (ERROR_INSUFFICIENT_BUFFER))
{
maxGlyphCount = actualGlyphsCount;
free (modifiedGlyphIndices);
free (modifiedGlyphAdvances);
free (modifiedGlyphOffsets);
maxGlyphCount = actualGlyphsCount;
goto retry_getjustifiedglyphs;
}
if (FAILED (hr))
{
FAIL ("Analyzer failed to get justified glyphs.");
return false;
}
free (clusterMap);
free (glyphIndices);
free (glyphAdvances);
free (glyphOffsets);
glyphCount = actualGlyphsCount;
clusterMap = modifiedClusterMap;
glyphIndices = modifiedGlyphIndices;
glyphAdvances = modifiedGlyphAdvances;
glyphOffsets = modifiedGlyphOffsets;
free (justifiedGlyphAdvances);
free (justifiedGlyphOffsets);
}
else
{
free (glyphAdvances);
free (glyphOffsets);
glyphAdvances = justifiedGlyphAdvances;
glyphOffsets = justifiedGlyphOffsets;
}
free (justificationOpportunities);
}
/* 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 < glyphCount; 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 < glyphCount; i++)
if (vis_clusters[i] == -1)
vis_clusters[i] = vis_clusters[i - 1];
#undef utf16_index
if (unlikely (!buffer->ensure (glyphCount)))
FAIL ("Buffer in error");
#undef FAIL
/* Set glyph infos */
buffer->len = 0;
for (unsigned int i = 0; i < glyphCount; i++)
{
hb_glyph_info_t *info = &buffer->info[buffer->len++];
info->codepoint = glyphIndices[i];
info->cluster = vis_clusters[i];
/* The rest is crap. Let's store position info there for now. */
info->mask = glyphAdvances[i];
info->var1.i32 = glyphOffsets[i].advanceOffset;
info->var2.i32 = glyphOffsets[i].ascenderOffset;
}
/* Set glyph positions */
buffer->clear_positions ();
for (unsigned int i = 0; i < glyphCount; 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 * (isRightToLeft ? -info->var1.i32 : info->var1.i32);
pos->y_offset = y_mult * info->var2.i32;
}
if (isRightToLeft)
hb_buffer_reverse (buffer);
free (clusterMap);
free (glyphIndices);
free (textProperties);
free (glyphProperties);
free (glyphAdvances);
free (glyphOffsets);
if (num_features)
free (singleFeatures.features);
/* Wow, done! */
return true;
}
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)
{
return _hb_directwrite_shape_full(shape_plan, font, buffer,
features, num_features, 0);
}
/*
* Public [experimental] API
*/
hb_bool_t
hb_directwrite_shape_experimental_width(hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features,
float width)
{
static char *shapers = "directwrite";
hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face,
&buffer->props, features, num_features, &shapers);
hb_bool_t res = _hb_directwrite_shape_full (shape_plan, font, buffer,
features, num_features, width);
if (res)
buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
return res;
}