[HarfBuzz] harfbuzz: Branch 'master' - 2 commits
Behdad Esfahbod
behdad at kemper.freedesktop.org
Mon Dec 7 00:35:29 PST 2015
src/hb-directwrite.cc | 827 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/hb-directwrite.h | 34 ++
src/hb-shaper-list.hh | 3
3 files changed, 864 insertions(+)
New commits:
commit 8c37556f730d7e961394075cd863f624af4c53c4
Merge: 8e5f902 f35b3e9
Author: Behdad Esfahbod <behdad at behdad.org>
Date: Mon Dec 7 09:34:58 2015 +0100
Merge pull request #134 from ebraminio/dwrite
Add working but less prefect DirectWrite backend
commit f35b3e931ddacd075c5d0810e9b17de07b232ee2
Author: Ebrahim Byagowi <ebrahim at gnu.org>
Date: Fri Sep 11 09:48:12 2015 +0430
Add a prototype of DirectWrite as a shaping backend
diff --git a/src/hb-directwrite.cc b/src/hb-directwrite.cc
new file mode 100644
index 0000000..5df1b2a
--- /dev/null
+++ b/src/hb-directwrite.cc
@@ -0,0 +1,827 @@
+/*
+ * Copyright © 2015 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;
+ 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 = 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 = 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 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;
+};
+
+
+/*
+ * 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);
+
+ if (FAILED(hr)) {
+ //NS_WARNING("Analyzer failed to generate results.");
+ return false;
+ }
+
+ UINT32 maxGlyphs = 3 * length / 2 + 16;
+
+#define INITIAL_GLYPH_SIZE 400
+ UINT16* clusters = (UINT16*)malloc(INITIAL_GLYPH_SIZE * sizeof(UINT16));
+ UINT16* glyphs = (UINT16*)malloc(INITIAL_GLYPH_SIZE * sizeof(UINT16));
+ DWRITE_SHAPING_TEXT_PROPERTIES* textProperties = (DWRITE_SHAPING_TEXT_PROPERTIES*)
+ malloc(INITIAL_GLYPH_SIZE * sizeof(DWRITE_SHAPING_TEXT_PROPERTIES));
+ DWRITE_SHAPING_GLYPH_PROPERTIES* glyphProperties = (DWRITE_SHAPING_GLYPH_PROPERTIES*)
+ malloc(INITIAL_GLYPH_SIZE * sizeof(DWRITE_SHAPING_GLYPH_PROPERTIES));
+
+ UINT32 actualGlyphs;
+
+ bool backward = HB_DIRECTION_IS_BACKWARD(buffer->props.direction);
+
+ wchar_t lang[4];
+ mbstowcs(lang, hb_language_to_string(buffer->props.language), 4);
+ hr = analyzer->GetGlyphs(pchars, length,
+ fontFace, FALSE,
+ buffer->props.direction,
+ &runHead->mScript, (const wchar_t*)lang, NULL, NULL, NULL, 0,
+ maxGlyphs, clusters, textProperties,
+ glyphs, glyphProperties, &actualGlyphs);
+
+ if (hr == HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)) {
+ free(clusters);
+ free(glyphs);
+ free(textProperties);
+ free(glyphProperties);
+
+ clusters = (UINT16*)malloc(INITIAL_GLYPH_SIZE * sizeof(UINT16));
+ glyphs = (UINT16*)malloc(INITIAL_GLYPH_SIZE * sizeof(UINT16));
+ textProperties = (DWRITE_SHAPING_TEXT_PROPERTIES*)
+ malloc(INITIAL_GLYPH_SIZE * sizeof(DWRITE_SHAPING_TEXT_PROPERTIES));
+ glyphProperties = (DWRITE_SHAPING_GLYPH_PROPERTIES*)
+ malloc(INITIAL_GLYPH_SIZE * sizeof(DWRITE_SHAPING_GLYPH_PROPERTIES));
+
+ hr = analyzer->GetGlyphs(pchars, length,
+ fontFace, FALSE,
+ buffer->props.direction,
+ &runHead->mScript, (const wchar_t*)lang, NULL, NULL, NULL, 0,
+ maxGlyphs, clusters, textProperties,
+ glyphs, glyphProperties, &actualGlyphs);
+ }
+ if (FAILED(hr)) {
+ //NS_WARNING("Analyzer failed to get glyphs.");
+ return false;
+ }
+
+ FLOAT advances[400];
+ DWRITE_GLYPH_OFFSET offsets[400];
+
+
+ /* 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
+
+ hr = analyzer->GetGlyphPlacements(pchars,
+ clusters,
+ textProperties,
+ length,
+ glyphs,
+ glyphProperties,
+ actualGlyphs,
+ fontFace,
+ face->get_upem(),
+ FALSE,
+ FALSE,
+ &runHead->mScript,
+ NULL,
+ NULL,
+ NULL,
+ 0,
+ advances,
+ offsets);
+
+ if (FAILED(hr)) {
+ //NS_WARNING("Analyzer failed to get glyph placements.");
+ return false;
+ }
+
+ unsigned int glyphs_len = actualGlyphs;
+
+ /* 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.u32 = offsets[i].ascenderOffset;
+ info->var2.u32 = -offsets[i].advanceOffset;
+ }
+
+ free(clusters);
+ free(glyphs);
+ free(textProperties);
+ free(glyphProperties);
+
+ /* Set glyph positions */
+ buffer->clear_positions ();
+ for (unsigned int i = 0; i < glyphs_len; i++)
+ {
+ hb_glyph_info_t *info = &buffer->info[i];
+ hb_glyph_position_t *pos = &buffer->pos[i];
+
+ /* TODO vertical */
+ pos->x_advance = info->mask;
+ pos->x_offset = backward ? -info->var1.u32 : info->var1.u32;
+ pos->y_offset = info->var2.u32;
+ }
+
+ if (backward)
+ hb_buffer_reverse (buffer);
+
+ /* Wow, done! */
+ return true;
+}
\ No newline at end of file
diff --git a/src/hb-directwrite.h b/src/hb-directwrite.h
new file mode 100644
index 0000000..adf33df
--- /dev/null
+++ b/src/hb-directwrite.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2015 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.
+ */
+
+#ifndef HB_DIRECTWRITE_H
+#define HB_DIRECTWRITE_H
+
+#include "hb.h"
+
+HB_BEGIN_DECLS
+
+HB_END_DECLS
+
+#endif /* HB_UNISCRIBE_H */
diff --git a/src/hb-shaper-list.hh b/src/hb-shaper-list.hh
index 6c537d4..b0835d3 100644
--- a/src/hb-shaper-list.hh
+++ b/src/hb-shaper-list.hh
@@ -46,6 +46,9 @@ HB_SHAPER_IMPLEMENT (ot) /* <--- This is our main OpenType shaper. */
#ifdef HAVE_UNISCRIBE
HB_SHAPER_IMPLEMENT (uniscribe)
#endif
+#ifdef HAVE_DIRECTWRITE
+HB_SHAPER_IMPLEMENT (directwrite)
+#endif
#ifdef HAVE_CORETEXT
HB_SHAPER_IMPLEMENT (coretext)
#endif
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