6d907faa7d
This allows some backends to efficiently retrieve a copy of the data. Inspired by https://skia-review.googlesource.com/c/skia/+/229136 Change-Id: I9b0345333e30376a50a5dc7c9e993b847e2791c4 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229384 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com> Auto-Submit: Mike Reed <reed@google.com>
1378 lines
51 KiB
C++
1378 lines
51 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/core/SkFont.h"
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#include "include/core/SkFontArguments.h"
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#include "include/core/SkFontMetrics.h"
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#include "include/core/SkFontMgr.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkStream.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/private/SkBitmaskEnum.h"
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#include "include/private/SkMalloc.h"
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#include "include/private/SkTArray.h"
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#include "include/private/SkTFitsIn.h"
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#include "include/private/SkTemplates.h"
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#include "include/private/SkTo.h"
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#include "modules/skshaper/include/SkShaper.h"
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#include "src/core/SkMakeUnique.h"
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#include "src/core/SkTDPQueue.h"
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#include "src/utils/SkUTF.h"
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#include <hb.h>
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#include <hb-icu.h>
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#include <hb-ot.h>
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#include <unicode/ubidi.h>
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#include <unicode/ubrk.h>
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#include <unicode/umachine.h>
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#include <unicode/urename.h>
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#include <unicode/uscript.h>
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#include <unicode/ustring.h>
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#include <unicode/utext.h>
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#include <unicode/utypes.h>
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#include <cstring>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#if defined(SK_USING_THIRD_PARTY_ICU)
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#include "SkLoadICU.h"
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#endif
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namespace skstd {
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template <> struct is_bitmask_enum<hb_buffer_flags_t> : std::true_type {};
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}
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namespace {
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template <class T, void(*P)(T*)> using resource = std::unique_ptr<T, SkFunctionWrapper<void, T, P>>;
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using HBBlob = resource<hb_blob_t , hb_blob_destroy >;
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using HBFace = resource<hb_face_t , hb_face_destroy >;
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using HBFont = resource<hb_font_t , hb_font_destroy >;
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using HBBuffer = resource<hb_buffer_t , hb_buffer_destroy>;
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using ICUBiDi = resource<UBiDi , ubidi_close >;
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using ICUBrk = resource<UBreakIterator, ubrk_close >;
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HBBlob stream_to_blob(std::unique_ptr<SkStreamAsset> asset) {
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size_t size = asset->getLength();
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HBBlob blob;
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if (const void* base = asset->getMemoryBase()) {
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blob.reset(hb_blob_create((char*)base, SkToUInt(size),
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HB_MEMORY_MODE_READONLY, asset.release(),
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[](void* p) { delete (SkStreamAsset*)p; }));
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} else {
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// SkDebugf("Extra SkStreamAsset copy\n");
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void* ptr = size ? sk_malloc_throw(size) : nullptr;
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asset->read(ptr, size);
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blob.reset(hb_blob_create((char*)ptr, SkToUInt(size),
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HB_MEMORY_MODE_READONLY, ptr, sk_free));
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}
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SkASSERT(blob);
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hb_blob_make_immutable(blob.get());
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return blob;
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}
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hb_position_t skhb_position(SkScalar value) {
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// Treat HarfBuzz hb_position_t as 16.16 fixed-point.
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constexpr int kHbPosition1 = 1 << 16;
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return SkScalarRoundToInt(value * kHbPosition1);
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}
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hb_bool_t skhb_glyph(hb_font_t* hb_font,
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void* font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t variation_selector,
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hb_codepoint_t* glyph,
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void* user_data) {
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SkFont& font = *reinterpret_cast<SkFont*>(font_data);
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*glyph = font.unicharToGlyph(unicode);
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return *glyph != 0;
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}
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hb_bool_t skhb_nominal_glyph(hb_font_t* hb_font,
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void* font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t* glyph,
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void* user_data) {
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return skhb_glyph(hb_font, font_data, unicode, 0, glyph, user_data);
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}
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unsigned skhb_nominal_glyphs(hb_font_t *hb_font, void *font_data,
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unsigned int count,
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const hb_codepoint_t *unicodes,
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unsigned int unicode_stride,
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hb_codepoint_t *glyphs,
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unsigned int glyph_stride,
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void *user_data) {
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SkFont& font = *reinterpret_cast<SkFont*>(font_data);
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// Batch call textToGlyphs since entry cost is not cheap.
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// Copy requred because textToGlyphs is dense and hb is strided.
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SkAutoSTMalloc<256, SkUnichar> unicode(count);
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for (unsigned i = 0; i < count; i++) {
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unicode[i] = *unicodes;
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unicodes = SkTAddOffset<const hb_codepoint_t>(unicodes, unicode_stride);
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}
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SkAutoSTMalloc<256, SkGlyphID> glyph(count);
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font.textToGlyphs(unicode.get(), count * sizeof(SkUnichar), SkTextEncoding::kUTF32,
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glyph.get(), count);
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// Copy the results back to the sparse array.
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for (unsigned i = 0; i < count; i++) {
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*glyphs = glyph[i];
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glyphs = SkTAddOffset<hb_codepoint_t>(glyphs, glyph_stride);
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}
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// TODO: supposed to return index of first 0?
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return count;
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}
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hb_position_t skhb_glyph_h_advance(hb_font_t* hb_font,
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void* font_data,
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hb_codepoint_t codepoint,
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void* user_data) {
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SkFont& font = *reinterpret_cast<SkFont*>(font_data);
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SkScalar advance;
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SkGlyphID glyph = SkTo<SkGlyphID>(codepoint);
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font.getWidths(&glyph, 1, &advance);
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if (!font.isSubpixel()) {
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advance = SkScalarRoundToInt(advance);
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}
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return skhb_position(advance);
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}
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void skhb_glyph_h_advances(hb_font_t* hb_font,
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void* font_data,
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unsigned count,
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const hb_codepoint_t* glyphs,
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unsigned int glyph_stride,
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hb_position_t* advances,
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unsigned int advance_stride,
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void* user_data) {
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SkFont& font = *reinterpret_cast<SkFont*>(font_data);
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// Batch call getWidths since entry cost is not cheap.
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// Copy requred because getWidths is dense and hb is strided.
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SkAutoSTMalloc<256, SkGlyphID> glyph(count);
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for (unsigned i = 0; i < count; i++) {
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glyph[i] = *glyphs;
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glyphs = SkTAddOffset<const hb_codepoint_t>(glyphs, glyph_stride);
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}
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SkAutoSTMalloc<256, SkScalar> advance(count);
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font.getWidths(glyph.get(), count, advance.get());
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if (!font.isSubpixel()) {
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for (unsigned i = 0; i < count; i++) {
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advance[i] = SkScalarRoundToInt(advance[i]);
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}
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}
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// Copy the results back to the sparse array.
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for (unsigned i = 0; i < count; i++) {
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*advances = skhb_position(advance[i]);
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advances = SkTAddOffset<hb_position_t>(advances, advance_stride);
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}
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}
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// HarfBuzz callback to retrieve glyph extents, mainly used by HarfBuzz for
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// fallback mark positioning, i.e. the situation when the font does not have
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// mark anchors or other mark positioning rules, but instead HarfBuzz is
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// supposed to heuristically place combining marks around base glyphs. HarfBuzz
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// does this by measuring "ink boxes" of glyphs, and placing them according to
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// Unicode mark classes. Above, below, centered or left or right, etc.
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hb_bool_t skhb_glyph_extents(hb_font_t* hb_font,
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void* font_data,
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hb_codepoint_t codepoint,
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hb_glyph_extents_t* extents,
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void* user_data) {
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SkFont& font = *reinterpret_cast<SkFont*>(font_data);
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SkASSERT(codepoint < 0xFFFFu);
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SkASSERT(extents);
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SkRect sk_bounds;
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SkGlyphID glyph = codepoint;
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font.getWidths(&glyph, 1, nullptr, &sk_bounds);
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if (!font.isSubpixel()) {
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sk_bounds.set(sk_bounds.roundOut());
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}
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// Skia is y-down but HarfBuzz is y-up.
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extents->x_bearing = skhb_position(sk_bounds.fLeft);
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extents->y_bearing = skhb_position(-sk_bounds.fTop);
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extents->width = skhb_position(sk_bounds.width());
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extents->height = skhb_position(-sk_bounds.height());
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return true;
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}
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#define SK_HB_VERSION_CHECK(x, y, z) \
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(HB_VERSION_MAJOR > (x)) || \
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(HB_VERSION_MAJOR == (x) && HB_VERSION_MINOR > (y)) || \
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(HB_VERSION_MAJOR == (x) && HB_VERSION_MINOR == (y) && HB_VERSION_MICRO >= (z))
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hb_font_funcs_t* skhb_get_font_funcs() {
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static hb_font_funcs_t* const funcs = []{
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// HarfBuzz will use the default (parent) implementation if they aren't set.
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hb_font_funcs_t* const funcs = hb_font_funcs_create();
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hb_font_funcs_set_variation_glyph_func(funcs, skhb_glyph, nullptr, nullptr);
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hb_font_funcs_set_nominal_glyph_func(funcs, skhb_nominal_glyph, nullptr, nullptr);
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#if SK_HB_VERSION_CHECK(2, 0, 0)
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hb_font_funcs_set_nominal_glyphs_func(funcs, skhb_nominal_glyphs, nullptr, nullptr);
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#else
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sk_ignore_unused_variable(skhb_nominal_glyphs);
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#endif
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hb_font_funcs_set_glyph_h_advance_func(funcs, skhb_glyph_h_advance, nullptr, nullptr);
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#if SK_HB_VERSION_CHECK(1, 8, 6)
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hb_font_funcs_set_glyph_h_advances_func(funcs, skhb_glyph_h_advances, nullptr, nullptr);
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#else
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sk_ignore_unused_variable(skhb_glyph_h_advances);
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#endif
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hb_font_funcs_set_glyph_extents_func(funcs, skhb_glyph_extents, nullptr, nullptr);
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hb_font_funcs_make_immutable(funcs);
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return funcs;
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}();
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SkASSERT(funcs);
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return funcs;
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}
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hb_blob_t* skhb_get_table(hb_face_t* face, hb_tag_t tag, void* user_data) {
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SkTypeface& typeface = *reinterpret_cast<SkTypeface*>(user_data);
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auto data = typeface.copyTableData(tag);
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if (!data) {
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return nullptr;
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}
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SkData* rawData = data.release();
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return hb_blob_create(reinterpret_cast<char*>(rawData->writable_data()), rawData->size(),
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HB_MEMORY_MODE_WRITABLE, rawData, [](void* ctx) {
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((SkData*)ctx)->unref();
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});
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}
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HBFont create_hb_font(const SkFont& font) {
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SkASSERT(font.getTypeface());
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int index;
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std::unique_ptr<SkStreamAsset> typefaceAsset = font.getTypeface()->openStream(&index);
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HBFace face;
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if (!typefaceAsset) {
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face.reset(hb_face_create_for_tables(
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skhb_get_table,
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reinterpret_cast<void *>(font.refTypeface().release()),
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[](void* user_data){ SkSafeUnref(reinterpret_cast<SkTypeface*>(user_data)); }));
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} else {
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HBBlob blob(stream_to_blob(std::move(typefaceAsset)));
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face.reset(hb_face_create(blob.get(), (unsigned)index));
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}
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SkASSERT(face);
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if (!face) {
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return nullptr;
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}
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hb_face_set_index(face.get(), (unsigned)index);
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hb_face_set_upem(face.get(), font.getTypeface()->getUnitsPerEm());
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HBFont otFont(hb_font_create(face.get()));
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SkASSERT(otFont);
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if (!otFont) {
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return nullptr;
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}
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hb_ot_font_set_funcs(otFont.get());
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int axis_count = font.getTypeface()->getVariationDesignPosition(nullptr, 0);
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if (axis_count > 0) {
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SkAutoSTMalloc<4, SkFontArguments::VariationPosition::Coordinate> axis_values(axis_count);
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if (font.getTypeface()->getVariationDesignPosition(axis_values, axis_count) == axis_count) {
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hb_font_set_variations(otFont.get(),
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reinterpret_cast<hb_variation_t*>(axis_values.get()),
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axis_count);
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}
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}
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// Creating a sub font means that non-available functions
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// are found from the parent.
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HBFont skFont(hb_font_create_sub_font(otFont.get()));
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hb_font_set_funcs(skFont.get(), skhb_get_font_funcs(),
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reinterpret_cast<void *>(new SkFont(font)),
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[](void* user_data){ delete reinterpret_cast<SkFont*>(user_data); });
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int scale = skhb_position(font.getSize());
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hb_font_set_scale(skFont.get(), scale, scale);
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return skFont;
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}
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/** Replaces invalid utf-8 sequences with REPLACEMENT CHARACTER U+FFFD. */
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static inline SkUnichar utf8_next(const char** ptr, const char* end) {
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SkUnichar val = SkUTF::NextUTF8(ptr, end);
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return val < 0 ? 0xFFFD : val;
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}
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class IcuBiDiRunIterator final : public SkShaper::BiDiRunIterator {
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public:
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IcuBiDiRunIterator(const char* utf8, const char* end, ICUBiDi bidi)
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: fBidi(std::move(bidi))
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, fEndOfCurrentRun(utf8)
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, fBegin(utf8)
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, fEnd(end)
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, fUTF16LogicalPosition(0)
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, fLevel(UBIDI_DEFAULT_LTR)
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{}
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void consume() override {
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SkASSERT(fUTF16LogicalPosition < ubidi_getLength(fBidi.get()));
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int32_t endPosition = ubidi_getLength(fBidi.get());
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fLevel = ubidi_getLevelAt(fBidi.get(), fUTF16LogicalPosition);
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SkUnichar u = utf8_next(&fEndOfCurrentRun, fEnd);
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fUTF16LogicalPosition += SkUTF::ToUTF16(u);
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UBiDiLevel level;
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while (fUTF16LogicalPosition < endPosition) {
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level = ubidi_getLevelAt(fBidi.get(), fUTF16LogicalPosition);
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if (level != fLevel) {
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break;
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}
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u = utf8_next(&fEndOfCurrentRun, fEnd);
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fUTF16LogicalPosition += SkUTF::ToUTF16(u);
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}
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}
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size_t endOfCurrentRun() const override {
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return fEndOfCurrentRun - fBegin;
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}
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bool atEnd() const override {
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return fUTF16LogicalPosition == ubidi_getLength(fBidi.get());
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}
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UBiDiLevel currentLevel() const override {
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return fLevel;
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}
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private:
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ICUBiDi fBidi;
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char const * fEndOfCurrentRun;
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char const * const fBegin;
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char const * const fEnd;
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int32_t fUTF16LogicalPosition;
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UBiDiLevel fLevel;
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};
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class HbIcuScriptRunIterator final : public SkShaper::ScriptRunIterator {
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public:
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HbIcuScriptRunIterator(const char* utf8, size_t utf8Bytes)
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: fCurrent(utf8), fBegin(utf8), fEnd(fCurrent + utf8Bytes)
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, fCurrentScript(HB_SCRIPT_UNKNOWN)
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{}
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static hb_script_t hb_script_from_icu(SkUnichar u) {
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UErrorCode status = U_ZERO_ERROR;
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UScriptCode scriptCode = uscript_getScript(u, &status);
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if (U_FAILURE (status)) {
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return HB_SCRIPT_UNKNOWN;
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}
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return hb_icu_script_to_script(scriptCode);
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}
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void consume() override {
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SkASSERT(fCurrent < fEnd);
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SkUnichar u = utf8_next(&fCurrent, fEnd);
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fCurrentScript = hb_script_from_icu(u);
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while (fCurrent < fEnd) {
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const char* prev = fCurrent;
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u = utf8_next(&fCurrent, fEnd);
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const hb_script_t script = hb_script_from_icu(u);
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if (script != fCurrentScript) {
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if (fCurrentScript == HB_SCRIPT_INHERITED || fCurrentScript == HB_SCRIPT_COMMON) {
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fCurrentScript = script;
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} else if (script == HB_SCRIPT_INHERITED || script == HB_SCRIPT_COMMON) {
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continue;
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} else {
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fCurrent = prev;
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break;
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}
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}
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}
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if (fCurrentScript == HB_SCRIPT_INHERITED) {
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fCurrentScript = HB_SCRIPT_COMMON;
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}
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}
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size_t endOfCurrentRun() const override {
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return fCurrent - fBegin;
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}
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bool atEnd() const override {
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return fCurrent == fEnd;
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}
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SkFourByteTag currentScript() const override {
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return SkSetFourByteTag(HB_UNTAG(fCurrentScript));
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}
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private:
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char const * fCurrent;
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char const * const fBegin;
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char const * const fEnd;
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hb_script_t fCurrentScript;
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};
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class RunIteratorQueue {
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public:
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void insert(SkShaper::RunIterator* runIterator) {
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fRunIterators.insert(runIterator);
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}
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bool advanceRuns() {
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const SkShaper::RunIterator* leastRun = fRunIterators.peek();
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if (leastRun->atEnd()) {
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SkASSERT(this->allRunsAreAtEnd());
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return false;
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}
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const size_t leastEnd = leastRun->endOfCurrentRun();
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SkShaper::RunIterator* currentRun = nullptr;
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SkDEBUGCODE(size_t previousEndOfCurrentRun);
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while ((currentRun = fRunIterators.peek())->endOfCurrentRun() <= leastEnd) {
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fRunIterators.pop();
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SkDEBUGCODE(previousEndOfCurrentRun = currentRun->endOfCurrentRun());
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currentRun->consume();
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SkASSERT(previousEndOfCurrentRun < currentRun->endOfCurrentRun());
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fRunIterators.insert(currentRun);
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}
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return true;
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|
}
|
|
|
|
size_t endOfCurrentRun() const {
|
|
return fRunIterators.peek()->endOfCurrentRun();
|
|
}
|
|
|
|
private:
|
|
bool allRunsAreAtEnd() const {
|
|
for (int i = 0; i < fRunIterators.count(); ++i) {
|
|
if (!fRunIterators.at(i)->atEnd()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool CompareRunIterator(SkShaper::RunIterator* const& a, SkShaper::RunIterator* const& b) {
|
|
return a->endOfCurrentRun() < b->endOfCurrentRun();
|
|
}
|
|
SkTDPQueue<SkShaper::RunIterator*, CompareRunIterator> fRunIterators;
|
|
};
|
|
|
|
struct ShapedGlyph {
|
|
SkGlyphID fID;
|
|
uint32_t fCluster;
|
|
SkPoint fOffset;
|
|
SkVector fAdvance;
|
|
bool fMayLineBreakBefore;
|
|
bool fMustLineBreakBefore;
|
|
bool fHasVisual;
|
|
bool fGraphemeBreakBefore;
|
|
bool fUnsafeToBreak;
|
|
};
|
|
struct ShapedRun {
|
|
ShapedRun(SkShaper::RunHandler::Range utf8Range, const SkFont& font, UBiDiLevel level,
|
|
std::unique_ptr<ShapedGlyph[]> glyphs, size_t numGlyphs, SkVector advance = {0, 0})
|
|
: fUtf8Range(utf8Range), fFont(font), fLevel(level)
|
|
, fGlyphs(std::move(glyphs)), fNumGlyphs(numGlyphs), fAdvance(advance)
|
|
{}
|
|
|
|
SkShaper::RunHandler::Range fUtf8Range;
|
|
SkFont fFont;
|
|
UBiDiLevel fLevel;
|
|
std::unique_ptr<ShapedGlyph[]> fGlyphs;
|
|
size_t fNumGlyphs;
|
|
SkVector fAdvance;
|
|
};
|
|
struct ShapedLine {
|
|
SkTArray<ShapedRun> runs;
|
|
SkVector fAdvance = { 0, 0 };
|
|
};
|
|
|
|
constexpr bool is_LTR(UBiDiLevel level) {
|
|
return (level & 1) == 0;
|
|
}
|
|
|
|
void append(SkShaper::RunHandler* handler, const SkShaper::RunHandler::RunInfo& runInfo,
|
|
const ShapedRun& run, size_t startGlyphIndex, size_t endGlyphIndex) {
|
|
SkASSERT(startGlyphIndex <= endGlyphIndex);
|
|
const size_t glyphLen = endGlyphIndex - startGlyphIndex;
|
|
|
|
const auto buffer = handler->runBuffer(runInfo);
|
|
SkASSERT(buffer.glyphs);
|
|
SkASSERT(buffer.positions);
|
|
|
|
SkVector advance = {0,0};
|
|
for (size_t i = 0; i < glyphLen; i++) {
|
|
// Glyphs are in logical order, but output ltr since PDF readers seem to expect that.
|
|
const ShapedGlyph& glyph = run.fGlyphs[is_LTR(run.fLevel) ? startGlyphIndex + i
|
|
: endGlyphIndex - 1 - i];
|
|
buffer.glyphs[i] = glyph.fID;
|
|
if (buffer.offsets) {
|
|
buffer.positions[i] = advance + buffer.point;
|
|
buffer.offsets[i] = glyph.fOffset; //TODO: invert glyph.fOffset.fY?
|
|
} else {
|
|
buffer.positions[i] = advance + buffer.point + glyph.fOffset; //TODO: invert glyph.fOffset.fY?
|
|
}
|
|
if (buffer.clusters) {
|
|
buffer.clusters[i] = glyph.fCluster;
|
|
}
|
|
advance += glyph.fAdvance;
|
|
}
|
|
handler->commitRunBuffer(runInfo);
|
|
}
|
|
|
|
void emit(const ShapedLine& line, SkShaper::RunHandler* handler) {
|
|
// Reorder the runs and glyphs per line and write them out.
|
|
handler->beginLine();
|
|
|
|
int numRuns = line.runs.size();
|
|
SkAutoSTMalloc<4, UBiDiLevel> runLevels(numRuns);
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
runLevels[i] = line.runs[i].fLevel;
|
|
}
|
|
SkAutoSTMalloc<4, int32_t> logicalFromVisual(numRuns);
|
|
ubidi_reorderVisual(runLevels, numRuns, logicalFromVisual);
|
|
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
int logicalIndex = logicalFromVisual[i];
|
|
|
|
const auto& run = line.runs[logicalIndex];
|
|
const SkShaper::RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
handler->runInfo(info);
|
|
}
|
|
handler->commitRunInfo();
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
int logicalIndex = logicalFromVisual[i];
|
|
|
|
const auto& run = line.runs[logicalIndex];
|
|
const SkShaper::RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
append(handler, info, run, 0, run.fNumGlyphs);
|
|
}
|
|
|
|
handler->commitLine();
|
|
}
|
|
|
|
struct ShapedRunGlyphIterator {
|
|
ShapedRunGlyphIterator(const SkTArray<ShapedRun>& origRuns)
|
|
: fRuns(&origRuns), fRunIndex(0), fGlyphIndex(0)
|
|
{ }
|
|
|
|
ShapedRunGlyphIterator(const ShapedRunGlyphIterator& that) = default;
|
|
ShapedRunGlyphIterator& operator=(const ShapedRunGlyphIterator& that) = default;
|
|
bool operator==(const ShapedRunGlyphIterator& that) const {
|
|
return fRuns == that.fRuns &&
|
|
fRunIndex == that.fRunIndex &&
|
|
fGlyphIndex == that.fGlyphIndex;
|
|
}
|
|
bool operator!=(const ShapedRunGlyphIterator& that) const {
|
|
return fRuns != that.fRuns ||
|
|
fRunIndex != that.fRunIndex ||
|
|
fGlyphIndex != that.fGlyphIndex;
|
|
}
|
|
|
|
ShapedGlyph* next() {
|
|
const SkTArray<ShapedRun>& runs = *fRuns;
|
|
SkASSERT(fRunIndex < runs.count());
|
|
SkASSERT(fGlyphIndex < runs[fRunIndex].fNumGlyphs);
|
|
|
|
++fGlyphIndex;
|
|
if (fGlyphIndex == runs[fRunIndex].fNumGlyphs) {
|
|
fGlyphIndex = 0;
|
|
++fRunIndex;
|
|
if (fRunIndex >= runs.count()) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
return &runs[fRunIndex].fGlyphs[fGlyphIndex];
|
|
}
|
|
|
|
ShapedGlyph* current() {
|
|
const SkTArray<ShapedRun>& runs = *fRuns;
|
|
if (fRunIndex >= runs.count()) {
|
|
return nullptr;
|
|
}
|
|
return &runs[fRunIndex].fGlyphs[fGlyphIndex];
|
|
}
|
|
|
|
const SkTArray<ShapedRun>* fRuns;
|
|
int fRunIndex;
|
|
size_t fGlyphIndex;
|
|
};
|
|
|
|
class ShaperHarfBuzz : public SkShaper {
|
|
public:
|
|
ShaperHarfBuzz(HBBuffer, ICUBrk line, ICUBrk grapheme);
|
|
protected:
|
|
ICUBrk fLineBreakIterator;
|
|
ICUBrk fGraphemeBreakIterator;
|
|
|
|
ShapedRun shape(const char* utf8, size_t utf8Bytes,
|
|
const char* utf8Start,
|
|
const char* utf8End,
|
|
const BiDiRunIterator&,
|
|
const LanguageRunIterator&,
|
|
const ScriptRunIterator&,
|
|
const FontRunIterator&) const;
|
|
private:
|
|
HBBuffer fBuffer;
|
|
|
|
void shape(const char* utf8, size_t utf8Bytes,
|
|
const SkFont&,
|
|
bool leftToRight,
|
|
SkScalar width,
|
|
RunHandler*) const override;
|
|
|
|
void shape(const char* utf8Text, size_t textBytes,
|
|
FontRunIterator&,
|
|
BiDiRunIterator&,
|
|
ScriptRunIterator&,
|
|
LanguageRunIterator&,
|
|
SkScalar width,
|
|
RunHandler*) const override;
|
|
|
|
virtual void wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator&,
|
|
const LanguageRunIterator&,
|
|
const ScriptRunIterator&,
|
|
const FontRunIterator&,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler*) const = 0;
|
|
};
|
|
|
|
class ShaperDrivenWrapper : public ShaperHarfBuzz {
|
|
public:
|
|
using ShaperHarfBuzz::ShaperHarfBuzz;
|
|
private:
|
|
void wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator&,
|
|
const LanguageRunIterator&,
|
|
const ScriptRunIterator&,
|
|
const FontRunIterator&,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler*) const override;
|
|
};
|
|
|
|
class ShapeThenWrap : public ShaperHarfBuzz {
|
|
public:
|
|
using ShaperHarfBuzz::ShaperHarfBuzz;
|
|
private:
|
|
void wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator&,
|
|
const LanguageRunIterator&,
|
|
const ScriptRunIterator&,
|
|
const FontRunIterator&,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler*) const override;
|
|
};
|
|
|
|
class ShapeDontWrapOrReorder : public ShaperHarfBuzz {
|
|
public:
|
|
using ShaperHarfBuzz::ShaperHarfBuzz;
|
|
private:
|
|
void wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator&,
|
|
const LanguageRunIterator&,
|
|
const ScriptRunIterator&,
|
|
const FontRunIterator&,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler*) const override;
|
|
};
|
|
|
|
static std::unique_ptr<SkShaper> MakeHarfBuzz(bool correct) {
|
|
#if defined(SK_USING_THIRD_PARTY_ICU)
|
|
if (!SkLoadICU()) {
|
|
SkDEBUGF("SkLoadICU() failed!\n");
|
|
return nullptr;
|
|
}
|
|
#endif
|
|
HBBuffer buffer(hb_buffer_create());
|
|
if (!buffer) {
|
|
SkDEBUGF("Could not create hb_buffer");
|
|
return nullptr;
|
|
}
|
|
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
ICUBrk lineBreakIterator(ubrk_open(UBRK_LINE, "th", nullptr, 0, &status));
|
|
if (!lineBreakIterator || U_FAILURE(status)) {
|
|
SkDEBUGF("Could not create line break iterator: %s", u_errorName(status));
|
|
return nullptr;
|
|
}
|
|
|
|
ICUBrk graphemeBreakIterator(ubrk_open(UBRK_CHARACTER, "th", nullptr, 0, &status));
|
|
if (!graphemeBreakIterator || U_FAILURE(status)) {
|
|
SkDEBUGF("Could not create grapheme break iterator: %s", u_errorName(status));
|
|
return nullptr;
|
|
}
|
|
|
|
if (correct) {
|
|
return skstd::make_unique<ShaperDrivenWrapper>(
|
|
std::move(buffer), std::move(lineBreakIterator), std::move(graphemeBreakIterator));
|
|
} else {
|
|
return skstd::make_unique<ShapeThenWrap>(
|
|
std::move(buffer), std::move(lineBreakIterator), std::move(graphemeBreakIterator));
|
|
}
|
|
}
|
|
|
|
ShaperHarfBuzz::ShaperHarfBuzz(HBBuffer buffer, ICUBrk line, ICUBrk grapheme)
|
|
: fLineBreakIterator(std::move(line))
|
|
, fGraphemeBreakIterator(std::move(grapheme))
|
|
, fBuffer(std::move(buffer))
|
|
{}
|
|
|
|
void ShaperHarfBuzz::shape(const char* utf8, size_t utf8Bytes,
|
|
const SkFont& srcFont,
|
|
bool leftToRight,
|
|
SkScalar width,
|
|
RunHandler* handler) const
|
|
{
|
|
SkASSERT(handler);
|
|
sk_sp<SkFontMgr> fontMgr = SkFontMgr::RefDefault();
|
|
UBiDiLevel defaultLevel = leftToRight ? UBIDI_DEFAULT_LTR : UBIDI_DEFAULT_RTL;
|
|
|
|
std::unique_ptr<BiDiRunIterator> bidi(MakeIcuBiDiRunIterator(utf8, utf8Bytes, defaultLevel));
|
|
if (!bidi) {
|
|
return;
|
|
}
|
|
|
|
std::unique_ptr<LanguageRunIterator> language(MakeStdLanguageRunIterator(utf8, utf8Bytes));
|
|
if (!language) {
|
|
return;
|
|
}
|
|
|
|
std::unique_ptr<ScriptRunIterator> script(MakeHbIcuScriptRunIterator(utf8, utf8Bytes));
|
|
if (!script) {
|
|
return;
|
|
}
|
|
|
|
std::unique_ptr<FontRunIterator> font(MakeFontMgrRunIterator(utf8, utf8Bytes,
|
|
srcFont, std::move(fontMgr)));
|
|
if (!font) {
|
|
return;
|
|
}
|
|
|
|
this->shape(utf8, utf8Bytes, *font, *bidi, *script, *language, width, handler);
|
|
}
|
|
|
|
void ShaperHarfBuzz::shape(const char* utf8, size_t utf8Bytes,
|
|
FontRunIterator& font,
|
|
BiDiRunIterator& bidi,
|
|
ScriptRunIterator& script,
|
|
LanguageRunIterator& language,
|
|
SkScalar width,
|
|
RunHandler* handler) const
|
|
{
|
|
RunIteratorQueue runSegmenter;
|
|
runSegmenter.insert(&font);
|
|
runSegmenter.insert(&bidi);
|
|
runSegmenter.insert(&script);
|
|
runSegmenter.insert(&language);
|
|
|
|
this->wrap(utf8, utf8Bytes, bidi, language, script, font, runSegmenter, width, handler);
|
|
}
|
|
|
|
void ShaperDrivenWrapper::wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator& bidi,
|
|
const LanguageRunIterator& language,
|
|
const ScriptRunIterator& script,
|
|
const FontRunIterator& font,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler* handler) const
|
|
{
|
|
ShapedLine line;
|
|
|
|
const char* utf8Start = nullptr;
|
|
const char* utf8End = utf8;
|
|
while (runSegmenter.advanceRuns()) { // For each item
|
|
utf8Start = utf8End;
|
|
utf8End = utf8 + runSegmenter.endOfCurrentRun();
|
|
|
|
ShapedRun model(RunHandler::Range(), SkFont(), 0, nullptr, 0);
|
|
bool modelNeedsRegenerated = true;
|
|
int modelGlyphOffset = 0;
|
|
|
|
struct TextProps {
|
|
int glyphLen = 0;
|
|
SkVector advance = {0, 0};
|
|
};
|
|
// map from character position to [safe to break, glyph position, advance]
|
|
std::unique_ptr<TextProps[]> modelText;
|
|
int modelTextOffset = 0;
|
|
SkVector modelAdvanceOffset = {0, 0};
|
|
|
|
while (utf8Start < utf8End) { // While there are still code points left in this item
|
|
size_t utf8runLength = utf8End - utf8Start;
|
|
if (modelNeedsRegenerated) {
|
|
model = shape(utf8, utf8Bytes,
|
|
utf8Start, utf8End,
|
|
bidi, language, script, font);
|
|
modelGlyphOffset = 0;
|
|
|
|
SkVector advance = {0, 0};
|
|
modelText.reset(new TextProps[utf8runLength + 1]());
|
|
size_t modelStartCluster = utf8Start - utf8;
|
|
for (size_t i = 0; i < model.fNumGlyphs; ++i) {
|
|
SkASSERT(modelStartCluster <= model.fGlyphs[i].fCluster);
|
|
SkASSERT( model.fGlyphs[i].fCluster < (size_t)(utf8End - utf8));
|
|
if (!model.fGlyphs[i].fUnsafeToBreak) {
|
|
modelText[model.fGlyphs[i].fCluster - modelStartCluster].glyphLen = i;
|
|
modelText[model.fGlyphs[i].fCluster - modelStartCluster].advance = advance;
|
|
}
|
|
advance += model.fGlyphs[i].fAdvance;
|
|
}
|
|
// Assume it is always safe to break after the end of an item
|
|
modelText[utf8runLength].glyphLen = model.fNumGlyphs;
|
|
modelText[utf8runLength].advance = model.fAdvance;
|
|
modelTextOffset = 0;
|
|
modelAdvanceOffset = {0, 0};
|
|
modelNeedsRegenerated = false;
|
|
}
|
|
|
|
// TODO: break iterator per item, but just reset position if needed?
|
|
// Maybe break iterator with model?
|
|
UBreakIterator& breakIterator = *fLineBreakIterator;
|
|
{
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UText utf8UText = UTEXT_INITIALIZER;
|
|
utext_openUTF8(&utf8UText, utf8Start, utf8runLength, &status);
|
|
std::unique_ptr<UText, SkFunctionWrapper<UText*, UText, utext_close>> autoClose(&utf8UText);
|
|
if (U_FAILURE(status)) {
|
|
SkDebugf("Could not create utf8UText: %s", u_errorName(status));
|
|
return;
|
|
}
|
|
ubrk_setUText(&breakIterator, &utf8UText, &status);
|
|
if (U_FAILURE(status)) {
|
|
SkDebugf("Could not setText on break iterator: %s", u_errorName(status));
|
|
return;
|
|
}
|
|
}
|
|
|
|
ShapedRun best(RunHandler::Range(), SkFont(), 0, nullptr, 0,
|
|
{ SK_ScalarNegativeInfinity, SK_ScalarNegativeInfinity });
|
|
bool bestIsInvalid = true;
|
|
bool bestUsesModelForGlyphs = false;
|
|
SkScalar widthLeft = width - line.fAdvance.fX;
|
|
|
|
for (int32_t breakIteratorCurrent = ubrk_next(&breakIterator);
|
|
breakIteratorCurrent != UBRK_DONE;
|
|
breakIteratorCurrent = ubrk_next(&breakIterator))
|
|
{
|
|
// TODO: if past a safe to break, future safe to break will be at least as long
|
|
|
|
// TODO: adjust breakIteratorCurrent by ignorable whitespace
|
|
bool candidateUsesModelForGlyphs = false;
|
|
ShapedRun candidate = [&](const TextProps& props){
|
|
if (props.glyphLen) {
|
|
candidateUsesModelForGlyphs = true;
|
|
return ShapedRun(RunHandler::Range(utf8Start - utf8, breakIteratorCurrent),
|
|
font.currentFont(), bidi.currentLevel(),
|
|
std::unique_ptr<ShapedGlyph[]>(),
|
|
props.glyphLen - modelGlyphOffset,
|
|
props.advance - modelAdvanceOffset);
|
|
} else {
|
|
return shape(utf8, utf8Bytes,
|
|
utf8Start, utf8Start + breakIteratorCurrent,
|
|
bidi, language, script, font);
|
|
}
|
|
}(modelText[breakIteratorCurrent + modelTextOffset]);
|
|
auto score = [widthLeft](const ShapedRun& run) -> SkScalar {
|
|
if (run.fAdvance.fX < widthLeft) {
|
|
return run.fUtf8Range.size();
|
|
} else {
|
|
return widthLeft - run.fAdvance.fX;
|
|
}
|
|
};
|
|
if (bestIsInvalid || score(best) < score(candidate)) {
|
|
best = std::move(candidate);
|
|
bestIsInvalid = false;
|
|
bestUsesModelForGlyphs = candidateUsesModelForGlyphs;
|
|
}
|
|
}
|
|
|
|
// If nothing fit (best score is negative) and the line is not empty
|
|
if (width < line.fAdvance.fX + best.fAdvance.fX && !line.runs.empty()) {
|
|
emit(line, handler);
|
|
line.runs.reset();
|
|
line.fAdvance = {0, 0};
|
|
} else {
|
|
if (bestUsesModelForGlyphs) {
|
|
best.fGlyphs.reset(new ShapedGlyph[best.fNumGlyphs]);
|
|
memcpy(best.fGlyphs.get(), model.fGlyphs.get() + modelGlyphOffset,
|
|
best.fNumGlyphs * sizeof(ShapedGlyph));
|
|
modelGlyphOffset += best.fNumGlyphs;
|
|
modelTextOffset += best.fUtf8Range.size();
|
|
modelAdvanceOffset += best.fAdvance;
|
|
} else {
|
|
modelNeedsRegenerated = true;
|
|
}
|
|
utf8Start += best.fUtf8Range.size();
|
|
line.fAdvance += best.fAdvance;
|
|
line.runs.emplace_back(std::move(best));
|
|
|
|
// If item broken, emit line (prevent remainder from accidentally fitting)
|
|
if (utf8Start != utf8End) {
|
|
emit(line, handler);
|
|
line.runs.reset();
|
|
line.fAdvance = {0, 0};
|
|
}
|
|
}
|
|
}
|
|
}
|
|
emit(line, handler);
|
|
}
|
|
|
|
void ShapeThenWrap::wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator& bidi,
|
|
const LanguageRunIterator& language,
|
|
const ScriptRunIterator& script,
|
|
const FontRunIterator& font,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler* handler) const
|
|
{
|
|
SkTArray<ShapedRun> runs;
|
|
{
|
|
UBreakIterator& lineBreakIterator = *fLineBreakIterator;
|
|
UBreakIterator& graphemeBreakIterator = *fGraphemeBreakIterator;
|
|
{
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UText utf8UText = UTEXT_INITIALIZER;
|
|
utext_openUTF8(&utf8UText, utf8, utf8Bytes, &status);
|
|
std::unique_ptr<UText, SkFunctionWrapper<UText*, UText, utext_close>> autoClose(&utf8UText);
|
|
if (U_FAILURE(status)) {
|
|
SkDebugf("Could not create utf8UText: %s", u_errorName(status));
|
|
return;
|
|
}
|
|
|
|
ubrk_setUText(&lineBreakIterator, &utf8UText, &status);
|
|
if (U_FAILURE(status)) {
|
|
SkDebugf("Could not setText on line break iterator: %s", u_errorName(status));
|
|
return;
|
|
}
|
|
ubrk_setUText(&graphemeBreakIterator, &utf8UText, &status);
|
|
if (U_FAILURE(status)) {
|
|
SkDebugf("Could not setText on grapheme break iterator: %s", u_errorName(status));
|
|
return;
|
|
}
|
|
}
|
|
|
|
const char* utf8Start = nullptr;
|
|
const char* utf8End = utf8;
|
|
while (runSegmenter.advanceRuns()) {
|
|
utf8Start = utf8End;
|
|
utf8End = utf8 + runSegmenter.endOfCurrentRun();
|
|
|
|
runs.emplace_back(shape(utf8, utf8Bytes,
|
|
utf8Start, utf8End,
|
|
bidi, language, script, font));
|
|
ShapedRun& run = runs.back();
|
|
|
|
uint32_t previousCluster = 0xFFFFFFFF;
|
|
for (size_t i = 0; i < run.fNumGlyphs; ++i) {
|
|
ShapedGlyph& glyph = run.fGlyphs[i];
|
|
int32_t glyphCluster = glyph.fCluster;
|
|
|
|
int32_t lineBreakIteratorCurrent = ubrk_current(&lineBreakIterator);
|
|
while (lineBreakIteratorCurrent != UBRK_DONE &&
|
|
lineBreakIteratorCurrent < glyphCluster)
|
|
{
|
|
lineBreakIteratorCurrent = ubrk_next(&lineBreakIterator);
|
|
}
|
|
glyph.fMayLineBreakBefore = glyph.fCluster != previousCluster &&
|
|
lineBreakIteratorCurrent == glyphCluster;
|
|
|
|
int32_t graphemeBreakIteratorCurrent = ubrk_current(&graphemeBreakIterator);
|
|
while (graphemeBreakIteratorCurrent != UBRK_DONE &&
|
|
graphemeBreakIteratorCurrent < glyphCluster)
|
|
{
|
|
graphemeBreakIteratorCurrent = ubrk_next(&graphemeBreakIterator);
|
|
}
|
|
glyph.fGraphemeBreakBefore = glyph.fCluster != previousCluster &&
|
|
graphemeBreakIteratorCurrent == glyphCluster;
|
|
|
|
previousCluster = glyph.fCluster;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Iterate over the glyphs in logical order to find potential line lengths.
|
|
{
|
|
/** The position of the beginning of the line. */
|
|
ShapedRunGlyphIterator beginning(runs);
|
|
|
|
/** The position of the candidate line break. */
|
|
ShapedRunGlyphIterator candidateLineBreak(runs);
|
|
SkScalar candidateLineBreakWidth = 0;
|
|
|
|
/** The position of the candidate grapheme break. */
|
|
ShapedRunGlyphIterator candidateGraphemeBreak(runs);
|
|
SkScalar candidateGraphemeBreakWidth = 0;
|
|
|
|
/** The position of the current location. */
|
|
ShapedRunGlyphIterator current(runs);
|
|
SkScalar currentWidth = 0;
|
|
while (ShapedGlyph* glyph = current.current()) {
|
|
// 'Break' at graphemes until a line boundary, then only at line boundaries.
|
|
// Only break at graphemes if no line boundary is valid.
|
|
if (current != beginning) {
|
|
if (glyph->fGraphemeBreakBefore || glyph->fMayLineBreakBefore) {
|
|
// TODO: preserve line breaks <= grapheme breaks
|
|
// and prevent line breaks inside graphemes
|
|
candidateGraphemeBreak = current;
|
|
candidateGraphemeBreakWidth = currentWidth;
|
|
if (glyph->fMayLineBreakBefore) {
|
|
candidateLineBreak = current;
|
|
candidateLineBreakWidth = currentWidth;
|
|
}
|
|
}
|
|
}
|
|
|
|
SkScalar glyphWidth = glyph->fAdvance.fX;
|
|
// Break when overwidth, the glyph has a visual representation, and some space is used.
|
|
if (width < currentWidth + glyphWidth && glyph->fHasVisual && candidateGraphemeBreakWidth > 0){
|
|
if (candidateLineBreak != beginning) {
|
|
beginning = candidateLineBreak;
|
|
currentWidth -= candidateLineBreakWidth;
|
|
candidateGraphemeBreakWidth -= candidateLineBreakWidth;
|
|
candidateLineBreakWidth = 0;
|
|
} else if (candidateGraphemeBreak != beginning) {
|
|
beginning = candidateGraphemeBreak;
|
|
candidateLineBreak = beginning;
|
|
currentWidth -= candidateGraphemeBreakWidth;
|
|
candidateGraphemeBreakWidth = 0;
|
|
candidateLineBreakWidth = 0;
|
|
} else {
|
|
SK_ABORT("");
|
|
}
|
|
|
|
if (width < currentWidth) {
|
|
if (width < candidateGraphemeBreakWidth) {
|
|
candidateGraphemeBreak = candidateLineBreak;
|
|
candidateGraphemeBreakWidth = candidateLineBreakWidth;
|
|
}
|
|
current = candidateGraphemeBreak;
|
|
currentWidth = candidateGraphemeBreakWidth;
|
|
}
|
|
|
|
glyph = beginning.current();
|
|
if (glyph) {
|
|
glyph->fMustLineBreakBefore = true;
|
|
}
|
|
|
|
} else {
|
|
current.next();
|
|
currentWidth += glyphWidth;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Reorder the runs and glyphs per line and write them out.
|
|
{
|
|
ShapedRunGlyphIterator previousBreak(runs);
|
|
ShapedRunGlyphIterator glyphIterator(runs);
|
|
int previousRunIndex = -1;
|
|
while (glyphIterator.current()) {
|
|
int runIndex = glyphIterator.fRunIndex;
|
|
size_t glyphIndex = glyphIterator.fGlyphIndex;
|
|
ShapedGlyph* nextGlyph = glyphIterator.next();
|
|
|
|
if (previousRunIndex != runIndex) {
|
|
SkFontMetrics metrics;
|
|
runs[runIndex].fFont.getMetrics(&metrics);
|
|
previousRunIndex = runIndex;
|
|
}
|
|
|
|
// Nothing can be written until the baseline is known.
|
|
if (!(nextGlyph == nullptr || nextGlyph->fMustLineBreakBefore)) {
|
|
continue;
|
|
}
|
|
|
|
int numRuns = runIndex - previousBreak.fRunIndex + 1;
|
|
SkAutoSTMalloc<4, UBiDiLevel> runLevels(numRuns);
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
runLevels[i] = runs[previousBreak.fRunIndex + i].fLevel;
|
|
}
|
|
SkAutoSTMalloc<4, int32_t> logicalFromVisual(numRuns);
|
|
ubidi_reorderVisual(runLevels, numRuns, logicalFromVisual);
|
|
|
|
// step through the runs in reverse visual order and the glyphs in reverse logical order
|
|
// until a visible glyph is found and force them to the end of the visual line.
|
|
|
|
handler->beginLine();
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
int logicalIndex = previousBreak.fRunIndex + logicalFromVisual[i];
|
|
const auto& run = runs[logicalIndex];
|
|
const RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
handler->runInfo(info);
|
|
}
|
|
handler->commitRunInfo();
|
|
for (int i = 0; i < numRuns; ++i) {
|
|
int logicalIndex = previousBreak.fRunIndex + logicalFromVisual[i];
|
|
const auto& run = runs[logicalIndex];
|
|
const RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
|
|
size_t startGlyphIndex = (logicalIndex == previousBreak.fRunIndex)
|
|
? previousBreak.fGlyphIndex
|
|
: 0;
|
|
size_t endGlyphIndex = (logicalIndex == runIndex)
|
|
? glyphIndex + 1
|
|
: run.fNumGlyphs;
|
|
|
|
append(handler, info, run, startGlyphIndex, endGlyphIndex);
|
|
}
|
|
|
|
handler->commitLine();
|
|
|
|
previousRunIndex = -1;
|
|
previousBreak = glyphIterator;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ShapeDontWrapOrReorder::wrap(char const * const utf8, size_t utf8Bytes,
|
|
const BiDiRunIterator& bidi,
|
|
const LanguageRunIterator& language,
|
|
const ScriptRunIterator& script,
|
|
const FontRunIterator& font,
|
|
RunIteratorQueue& runSegmenter,
|
|
SkScalar width,
|
|
RunHandler* handler) const
|
|
{
|
|
sk_ignore_unused_variable(width);
|
|
SkTArray<ShapedRun> runs;
|
|
|
|
const char* utf8Start = nullptr;
|
|
const char* utf8End = utf8;
|
|
while (runSegmenter.advanceRuns()) {
|
|
utf8Start = utf8End;
|
|
utf8End = utf8 + runSegmenter.endOfCurrentRun();
|
|
|
|
runs.emplace_back(shape(utf8, utf8Bytes,
|
|
utf8Start, utf8End,
|
|
bidi, language, script, font));
|
|
}
|
|
|
|
handler->beginLine();
|
|
for (const auto& run : runs) {
|
|
const RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
handler->runInfo(info);
|
|
}
|
|
handler->commitRunInfo();
|
|
for (const auto& run : runs) {
|
|
const RunHandler::RunInfo info = {
|
|
run.fFont,
|
|
run.fLevel,
|
|
run.fAdvance,
|
|
run.fNumGlyphs,
|
|
run.fUtf8Range
|
|
};
|
|
append(handler, info, run, 0, run.fNumGlyphs);
|
|
}
|
|
handler->commitLine();
|
|
}
|
|
|
|
ShapedRun ShaperHarfBuzz::shape(char const * const utf8,
|
|
size_t const utf8Bytes,
|
|
char const * const utf8Start,
|
|
char const * const utf8End,
|
|
const BiDiRunIterator& bidi,
|
|
const LanguageRunIterator& language,
|
|
const ScriptRunIterator& script,
|
|
const FontRunIterator& font) const
|
|
{
|
|
size_t utf8runLength = utf8End - utf8Start;
|
|
ShapedRun run(RunHandler::Range(utf8Start - utf8, utf8runLength),
|
|
font.currentFont(), bidi.currentLevel(), nullptr, 0);
|
|
|
|
hb_buffer_t* buffer = fBuffer.get();
|
|
SkAutoTCallVProc<hb_buffer_t, hb_buffer_clear_contents> autoClearBuffer(buffer);
|
|
hb_buffer_set_content_type(buffer, HB_BUFFER_CONTENT_TYPE_UNICODE);
|
|
hb_buffer_set_cluster_level(buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
|
|
|
|
// See 763e5466c0a03a7c27020e1e2598e488612529a7 for documentation.
|
|
hb_buffer_set_flags(buffer, HB_BUFFER_FLAG_BOT | HB_BUFFER_FLAG_EOT);
|
|
|
|
// Add precontext.
|
|
hb_buffer_add_utf8(buffer, utf8, utf8Start - utf8, utf8Start - utf8, 0);
|
|
|
|
// Populate the hb_buffer directly with utf8 cluster indexes.
|
|
const char* utf8Current = utf8Start;
|
|
while (utf8Current < utf8End) {
|
|
unsigned int cluster = utf8Current - utf8;
|
|
hb_codepoint_t u = utf8_next(&utf8Current, utf8End);
|
|
hb_buffer_add(buffer, u, cluster);
|
|
}
|
|
|
|
// Add postcontext.
|
|
hb_buffer_add_utf8(buffer, utf8Current, utf8 + utf8Bytes - utf8Current, 0, 0);
|
|
|
|
hb_direction_t direction = is_LTR(bidi.currentLevel()) ? HB_DIRECTION_LTR:HB_DIRECTION_RTL;
|
|
hb_buffer_set_direction(buffer, direction);
|
|
hb_buffer_set_script(buffer, hb_script_from_iso15924_tag((hb_tag_t)script.currentScript()));
|
|
hb_buffer_set_language(buffer, hb_language_from_string(language.currentLanguage(), -1));
|
|
hb_buffer_guess_segment_properties(buffer);
|
|
// TODO: features
|
|
|
|
// TODO: how to cache hbface (typeface) / hbfont (font)
|
|
HBFont hbFont(create_hb_font(font.currentFont()));
|
|
if (!hbFont) {
|
|
return run;
|
|
}
|
|
hb_shape(hbFont.get(), buffer, nullptr, 0);
|
|
unsigned len = hb_buffer_get_length(buffer);
|
|
if (len == 0) {
|
|
return run;
|
|
}
|
|
|
|
if (direction == HB_DIRECTION_RTL) {
|
|
// Put the clusters back in logical order.
|
|
// Note that the advances remain ltr.
|
|
hb_buffer_reverse(buffer);
|
|
}
|
|
hb_glyph_info_t* info = hb_buffer_get_glyph_infos(buffer, nullptr);
|
|
hb_glyph_position_t* pos = hb_buffer_get_glyph_positions(buffer, nullptr);
|
|
|
|
run = ShapedRun(RunHandler::Range(utf8Start - utf8, utf8runLength),
|
|
font.currentFont(), bidi.currentLevel(),
|
|
std::unique_ptr<ShapedGlyph[]>(new ShapedGlyph[len]), len);
|
|
int scaleX, scaleY;
|
|
hb_font_get_scale(hbFont.get(), &scaleX, &scaleY);
|
|
double textSizeY = run.fFont.getSize() / scaleY;
|
|
double textSizeX = run.fFont.getSize() / scaleX * run.fFont.getScaleX();
|
|
SkVector runAdvance = { 0, 0 };
|
|
for (unsigned i = 0; i < len; i++) {
|
|
ShapedGlyph& glyph = run.fGlyphs[i];
|
|
glyph.fID = info[i].codepoint;
|
|
glyph.fCluster = info[i].cluster;
|
|
glyph.fOffset.fX = pos[i].x_offset * textSizeX;
|
|
glyph.fOffset.fY = pos[i].y_offset * textSizeY;
|
|
glyph.fAdvance.fX = pos[i].x_advance * textSizeX;
|
|
glyph.fAdvance.fY = pos[i].y_advance * textSizeY;
|
|
|
|
SkRect bounds;
|
|
SkScalar advance;
|
|
SkPaint p;
|
|
run.fFont.getWidthsBounds(&glyph.fID, 1, &advance, &bounds, &p);
|
|
glyph.fHasVisual = !bounds.isEmpty(); //!font->currentTypeface()->glyphBoundsAreZero(glyph.fID);
|
|
#if SK_HB_VERSION_CHECK(1, 5, 0)
|
|
glyph.fUnsafeToBreak = info[i].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
|
|
#else
|
|
glyph.fUnsafeToBreak = false;
|
|
#endif
|
|
glyph.fMustLineBreakBefore = false;
|
|
|
|
runAdvance += glyph.fAdvance;
|
|
}
|
|
run.fAdvance = runAdvance;
|
|
|
|
return run;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
std::unique_ptr<SkShaper::BiDiRunIterator>
|
|
SkShaper::MakeIcuBiDiRunIterator(const char* utf8, size_t utf8Bytes, uint8_t bidiLevel) {
|
|
// ubidi only accepts utf16 (though internally it basically works on utf32 chars).
|
|
// We want an ubidi_setPara(UBiDi*, UText*, UBiDiLevel, UBiDiLevel*, UErrorCode*);
|
|
if (!SkTFitsIn<int32_t>(utf8Bytes)) {
|
|
SkDEBUGF("Bidi error: text too long");
|
|
return nullptr;
|
|
}
|
|
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
|
|
// Getting the length like this seems to always set U_BUFFER_OVERFLOW_ERROR
|
|
int32_t utf16Units;
|
|
u_strFromUTF8(nullptr, 0, &utf16Units, utf8, utf8Bytes, &status);
|
|
status = U_ZERO_ERROR;
|
|
std::unique_ptr<UChar[]> utf16(new UChar[utf16Units]);
|
|
u_strFromUTF8(utf16.get(), utf16Units, nullptr, utf8, utf8Bytes, &status);
|
|
if (U_FAILURE(status)) {
|
|
SkDEBUGF("Invalid utf8 input: %s", u_errorName(status));
|
|
return nullptr;
|
|
}
|
|
|
|
ICUBiDi bidi(ubidi_openSized(utf16Units, 0, &status));
|
|
if (U_FAILURE(status)) {
|
|
SkDEBUGF("Bidi error: %s", u_errorName(status));
|
|
return nullptr;
|
|
}
|
|
SkASSERT(bidi);
|
|
|
|
// The required lifetime of utf16 isn't well documented.
|
|
// It appears it isn't used after ubidi_setPara except through ubidi_getText.
|
|
ubidi_setPara(bidi.get(), utf16.get(), utf16Units, bidiLevel, nullptr, &status);
|
|
if (U_FAILURE(status)) {
|
|
SkDEBUGF("Bidi error: %s", u_errorName(status));
|
|
return nullptr;
|
|
}
|
|
|
|
return skstd::make_unique<IcuBiDiRunIterator>(utf8, utf8 + utf8Bytes, std::move(bidi));
|
|
}
|
|
|
|
std::unique_ptr<SkShaper::ScriptRunIterator>
|
|
SkShaper::MakeHbIcuScriptRunIterator(const char* utf8, size_t utf8Bytes) {
|
|
return skstd::make_unique<HbIcuScriptRunIterator>(utf8, utf8Bytes);
|
|
}
|
|
|
|
std::unique_ptr<SkShaper> SkShaper::MakeShaperDrivenWrapper() {
|
|
return MakeHarfBuzz(true);
|
|
}
|
|
std::unique_ptr<SkShaper> SkShaper::MakeShapeThenWrap() {
|
|
return MakeHarfBuzz(false);
|
|
}
|
|
std::unique_ptr<SkShaper> SkShaper::MakeShapeDontWrapOrReorder() {
|
|
#if defined(SK_USING_THIRD_PARTY_ICU)
|
|
if (!SkLoadICU()) {
|
|
SkDEBUGF("SkLoadICU() failed!\n");
|
|
return nullptr;
|
|
}
|
|
#endif
|
|
HBBuffer buffer(hb_buffer_create());
|
|
if (!buffer) {
|
|
SkDEBUGF("Could not create hb_buffer");
|
|
return nullptr;
|
|
}
|
|
|
|
return skstd::make_unique<ShapeDontWrapOrReorder>(std::move(buffer), nullptr, nullptr);
|
|
}
|