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Diffstat (limited to '')
| -rw-r--r-- | gfx/harfbuzz/src/hb-directwrite.cc | 884 |
1 files changed, 884 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-directwrite.cc b/gfx/harfbuzz/src/hb-directwrite.cc new file mode 100644 index 0000000000..42764a244b --- /dev/null +++ b/gfx/harfbuzz/src/hb-directwrite.cc @@ -0,0 +1,884 @@ +/* + * Copyright © 2015-2019 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. + */ + +#include "hb.hh" + +#ifdef HAVE_DIRECTWRITE + +#include "hb-shaper-impl.hh" + +#include <dwrite_1.h> + +#include "hb-directwrite.h" + +#include "hb-ms-feature-ranges.hh" + +/** + * SECTION:hb-directwrite + * @title: hb-directwrite + * @short_description: DirectWrite integration + * @include: hb-directwrite.h + * + * Functions for using HarfBuzz with DirectWrite fonts. + **/ + +/* Declare object creator for dynamic support of DWRITE */ +typedef HRESULT (WINAPI *t_DWriteCreateFactory)( + DWRITE_FACTORY_TYPE factoryType, + REFIID iid, + IUnknown **factory +); + + +/* + * 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_t fontFileReferenceKeySize, + OUT IDWriteFontFileStream** fontFileStream) + { + *fontFileStream = mFontFileStream; + return S_OK; + } + + virtual ~DWriteFontFileLoader() {} +}; + +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; } + + virtual ~DWriteFontFileStream() {} +}; + + +/* +* shaper face data +*/ + +struct hb_directwrite_face_data_t +{ + HMODULE dwrite_dll; + IDWriteFactory *dwriteFactory; + IDWriteFontFile *fontFile; + DWriteFontFileStream *fontFileStream; + DWriteFontFileLoader *fontFileLoader; + IDWriteFontFace *fontFace; + hb_blob_t *faceBlob; +}; + +hb_directwrite_face_data_t * +_hb_directwrite_shaper_face_data_create (hb_face_t *face) +{ + hb_directwrite_face_data_t *data = new hb_directwrite_face_data_t; + if (unlikely (!data)) + return nullptr; + +#define FAIL(...) \ + HB_STMT_START { \ + DEBUG_MSG (DIRECTWRITE, nullptr, __VA_ARGS__); \ + return nullptr; \ + } HB_STMT_END + + data->dwrite_dll = LoadLibrary (TEXT ("DWRITE")); + if (unlikely (!data->dwrite_dll)) + FAIL ("Cannot find DWrite.DLL"); + + t_DWriteCreateFactory p_DWriteCreateFactory; + +#if defined(__GNUC__) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wcast-function-type" +#endif + + p_DWriteCreateFactory = (t_DWriteCreateFactory) + GetProcAddress (data->dwrite_dll, "DWriteCreateFactory"); + +#if defined(__GNUC__) +#pragma GCC diagnostic pop +#endif + + if (unlikely (!p_DWriteCreateFactory)) + FAIL ("Cannot find DWriteCreateFactory()."); + + HRESULT hr; + + // TODO: factory and fontFileLoader should be cached separately + IDWriteFactory* dwriteFactory; + hr = p_DWriteCreateFactory (DWRITE_FACTORY_TYPE_SHARED, __uuidof (IDWriteFactory), + (IUnknown**) &dwriteFactory); + + if (unlikely (hr != S_OK)) + FAIL ("Failed to run DWriteCreateFactory()."); + + hb_blob_t *blob = hb_face_reference_blob (face); + DWriteFontFileStream *fontFileStream; + fontFileStream = new DWriteFontFileStream ((uint8_t *) hb_blob_get_data (blob, nullptr), + hb_blob_get_length (blob)); + + DWriteFontFileLoader *fontFileLoader = new DWriteFontFileLoader (fontFileStream); + dwriteFactory->RegisterFontFileLoader (fontFileLoader); + + IDWriteFontFile *fontFile; + uint64_t fontFileKey = 0; + hr = dwriteFactory->CreateCustomFontFileReference (&fontFileKey, sizeof (fontFileKey), + fontFileLoader, &fontFile); + + if (FAILED (hr)) + FAIL ("Failed to load font file from data!"); + + BOOL isSupported; + DWRITE_FONT_FILE_TYPE fileType; + DWRITE_FONT_FACE_TYPE faceType; + uint32_t numberOfFaces; + hr = fontFile->Analyze (&isSupported, &fileType, &faceType, &numberOfFaces); + if (FAILED (hr) || !isSupported) + FAIL ("Font file is not supported."); + +#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_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 (); + } + delete data->fontFileLoader; + delete data->fontFileStream; + hb_blob_destroy (data->faceBlob); + if (data->dwrite_dll) + FreeLibrary (data->dwrite_dll); + delete data; +} + + +/* + * shaper font data + */ + +struct hb_directwrite_font_data_t {}; + +hb_directwrite_font_data_t * +_hb_directwrite_shaper_font_data_create (hb_font_t *font) +{ + return (hb_directwrite_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; +} + +void +_hb_directwrite_shaper_font_data_destroy (hb_directwrite_font_data_t *data) +{ +} + + +// 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 + // text + DWRITE_SCRIPT_ANALYSIS mScript; + uint8_t mBidiLevel; + bool mIsSideways; + + 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) + : mTextLength (textLength), mText (text), mLocaleName (localeName), + mReadingDirection (readingDirection), mCurrentRun (nullptr) {} + ~TextAnalysis () + { + // delete runs, except mRunHead which is part of the TextAnalysis object + for (Run *run = mRunHead.nextRun; run;) + { + Run *origRun = run; + run = run->nextRun; + delete 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 = nullptr; + 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 = nullptr; + *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 though. + *textString = nullptr; + *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 = nullptr; + *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; + } + assert (0); // We should always be able to find the text position in one of our runs + } + + void SplitCurrentRun (uint32_t splitPosition) + { + if (!mCurrentRun) + { + assert (0); // 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 = new 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; +}; + +/* + * 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; + const hb_directwrite_face_data_t *face_data = face->data.directwrite; + 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; \ + do { \ + unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ + assert (_consumed <= scratch_size); \ + scratch += _consumed; \ + scratch_size -= _consumed; \ + } while (0) + +#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); + /* 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. */ + } + + DWRITE_READING_DIRECTION readingDirection; + 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 = chars_len; + + TextAnalysis analysis (textString, textLength, nullptr, readingDirection); + TextAnalysis::Run *runHead; + HRESULT hr; + hr = analysis.GenerateResults (analyzer, &runHead); + +#define FAIL(...) \ + HB_STMT_START { \ + DEBUG_MSG (DIRECTWRITE, nullptr, __VA_ARGS__); \ + return false; \ + } HB_STMT_END + + if (FAILED (hr)) + FAIL ("Analyzer failed to generate results."); + + 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) + mbstowcs ((wchar_t*) localeName, + hb_language_to_string (buffer->props.language), 20); + + /* + * Set up features. + */ + static_assert ((sizeof (DWRITE_TYPOGRAPHIC_FEATURES) == sizeof (hb_ms_features_t)), ""); + static_assert ((sizeof (DWRITE_FONT_FEATURE) == sizeof (hb_ms_feature_t)), ""); + hb_vector_t<hb_ms_features_t *> range_features; + hb_vector_t<uint32_t> range_char_counts; + if (num_features) + { + hb_vector_t<hb_ms_feature_t> feature_records; + hb_vector_t<hb_ms_range_record_t> range_records; + if (hb_ms_setup_features (features, num_features, feature_records, range_records)) + hb_ms_make_feature_ranges (feature_records, + range_records, + 0, + chars_len, + log_clusters, + range_features, + range_char_counts); + } + + uint16_t* clusterMap; + clusterMap = new uint16_t[textLength]; + DWRITE_SHAPING_TEXT_PROPERTIES* textProperties; + textProperties = new DWRITE_SHAPING_TEXT_PROPERTIES[textLength]; + +retry_getglyphs: + uint16_t* glyphIndices = new uint16_t[maxGlyphCount]; + DWRITE_SHAPING_GLYPH_PROPERTIES* glyphProperties; + glyphProperties = new DWRITE_SHAPING_GLYPH_PROPERTIES[maxGlyphCount]; + + hr = analyzer->GetGlyphs (textString, + chars_len, + fontFace, + false, + isRightToLeft, + &runHead->mScript, + localeName, + nullptr, + (const DWRITE_TYPOGRAPHIC_FEATURES**) range_features.arrayZ, + range_char_counts.arrayZ, + range_features.length, + maxGlyphCount, + clusterMap, + textProperties, + glyphIndices, + glyphProperties, + &glyphCount); + + if (unlikely (hr == HRESULT_FROM_WIN32 (ERROR_INSUFFICIENT_BUFFER))) + { + delete [] glyphIndices; + delete [] glyphProperties; + + maxGlyphCount *= 2; + + goto retry_getglyphs; + } + if (FAILED (hr)) + FAIL ("Analyzer failed to get glyphs."); + + float* glyphAdvances = new float[maxGlyphCount]; + DWRITE_GLYPH_OFFSET* glyphOffsets = new DWRITE_GLYPH_OFFSET[maxGlyphCount]; + + /* 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, + chars_len, + glyphIndices, + glyphProperties, + glyphCount, + fontFace, + fontEmSize, + false, + isRightToLeft, + &runHead->mScript, + localeName, + (const DWRITE_TYPOGRAPHIC_FEATURES**) range_features.arrayZ, + range_char_counts.arrayZ, + range_features.length, + glyphAdvances, + glyphOffsets); + + if (FAILED (hr)) + FAIL ("Analyzer failed to get glyph placements."); + + /* 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] = (uint32_t) -1; + for (unsigned int i = 0; i < buffer->len; i++) + { + uint32_t *p = + &vis_clusters[log_clusters[buffer->info[i].utf16_index ()]]; + *p = hb_min (*p, buffer->info[i].cluster); + } + for (unsigned int i = 1; i < glyphCount; i++) + if (vis_clusters[i] == (uint32_t) -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); + + buffer->clear_glyph_flags (); + buffer->unsafe_to_break (); + + delete [] clusterMap; + delete [] glyphIndices; + delete [] textProperties; + delete [] glyphProperties; + delete [] glyphAdvances; + delete [] glyphOffsets; + + /* Wow, done! */ + return true; +} + +struct _hb_directwrite_font_table_context { + IDWriteFontFace *face; + void *table_context; +}; + +static void +_hb_directwrite_table_data_release (void *data) +{ + _hb_directwrite_font_table_context *context = (_hb_directwrite_font_table_context *) data; + context->face->ReleaseFontTable (context->table_context); + hb_free (context); +} + +static hb_blob_t * +_hb_directwrite_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) +{ + IDWriteFontFace *dw_face = ((IDWriteFontFace *) user_data); + const void *data; + uint32_t length; + void *table_context; + BOOL exists; + if (!dw_face || FAILED (dw_face->TryGetFontTable (hb_uint32_swap (tag), &data, + &length, &table_context, &exists))) + return nullptr; + + if (!data || !exists || !length) + { + dw_face->ReleaseFontTable (table_context); + return nullptr; + } + + _hb_directwrite_font_table_context *context = (_hb_directwrite_font_table_context *) hb_malloc (sizeof (_hb_directwrite_font_table_context)); + context->face = dw_face; + context->table_context = table_context; + + return hb_blob_create ((const char *) data, length, HB_MEMORY_MODE_READONLY, + context, _hb_directwrite_table_data_release); +} + +static void +_hb_directwrite_font_release (void *data) +{ + if (data) + ((IDWriteFontFace *) data)->Release (); +} + +/** + * hb_directwrite_face_create: + * @font_face: a DirectWrite IDWriteFontFace object. + * + * Constructs a new face object from the specified DirectWrite IDWriteFontFace. + * + * Return value: #hb_face_t object corresponding to the given input + * + * Since: 2.4.0 + **/ +hb_face_t * +hb_directwrite_face_create (IDWriteFontFace *font_face) +{ + if (font_face) + font_face->AddRef (); + return hb_face_create_for_tables (_hb_directwrite_reference_table, font_face, + _hb_directwrite_font_release); +} + +/** +* hb_directwrite_face_get_font_face: +* @face: a #hb_face_t object +* +* Gets the DirectWrite IDWriteFontFace associated with @face. +* +* Return value: DirectWrite IDWriteFontFace object corresponding to the given input +* +* Since: 2.5.0 +**/ +IDWriteFontFace * +hb_directwrite_face_get_font_face (hb_face_t *face) +{ + return face->data.directwrite->fontFace; +} + + +#endif |