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Unified Diff: ui/gfx/render_text_win.cc

Issue 891013003: Delete RenderTextWin and RenderTextPango. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: update switch comment Created 5 years, 11 months ago
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Index: ui/gfx/render_text_win.cc
diff --git a/ui/gfx/render_text_win.cc b/ui/gfx/render_text_win.cc
deleted file mode 100644
index f1925993ef65aae09a78d79e07526d6c583af315..0000000000000000000000000000000000000000
--- a/ui/gfx/render_text_win.cc
+++ /dev/null
@@ -1,1261 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/gfx/render_text_win.h"
-
-#include <algorithm>
-
-#include "base/i18n/break_iterator.h"
-#include "base/i18n/char_iterator.h"
-#include "base/i18n/rtl.h"
-#include "base/logging.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/win/windows_version.h"
-#include "third_party/icu/source/common/unicode/uchar.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/font_fallback_win.h"
-#include "ui/gfx/font_render_params.h"
-#include "ui/gfx/geometry/size_conversions.h"
-#include "ui/gfx/platform_font_win.h"
-#include "ui/gfx/utf16_indexing.h"
-
-namespace gfx {
-
-namespace {
-
-// The maximum length of text supported for Uniscribe layout and display.
-// This empirically chosen value should prevent major performance degradations.
-// TODO(msw): Support longer text, partial layout/painting, etc.
-const size_t kMaxUniscribeTextLength = 10000;
-
-// The initial guess and maximum supported number of runs; arbitrary values.
-// TODO(msw): Support more runs, determine a better initial guess, etc.
-const int kGuessRuns = 100;
-const size_t kMaxRuns = 10000;
-
-// The maximum number of glyphs per run; ScriptShape fails on larger values.
-const size_t kMaxGlyphs = 65535;
-
-// Changes |font| to have the specified |font_size| (or |font_height| on Windows
-// XP) and |font_style| if it is not the case already. Only considers bold and
-// italic styles, since the underlined style has no effect on glyph shaping.
-void DeriveFontIfNecessary(int font_size,
- int font_height,
- int font_style,
- Font* font) {
- const int kStyleMask = (Font::BOLD | Font::ITALIC);
- const int target_style = (font_style & kStyleMask);
-
- // On Windows XP, the font must be resized using |font_height| instead of
- // |font_size| to match GDI behavior.
- if (base::win::GetVersion() < base::win::VERSION_VISTA) {
- PlatformFontWin* platform_font =
- static_cast<PlatformFontWin*>(font->platform_font());
- *font = platform_font->DeriveFontWithHeight(font_height, target_style);
- return;
- }
-
- const int current_style = (font->GetStyle() & kStyleMask);
- const int current_size = font->GetFontSize();
- if (current_style != target_style || current_size != font_size)
- *font = font->Derive(font_size - current_size, target_style);
-}
-
-// Returns true if |c| is a Unicode BiDi control character.
-bool IsUnicodeBidiControlCharacter(base::char16 c) {
- return c == base::i18n::kRightToLeftMark ||
- c == base::i18n::kLeftToRightMark ||
- c == base::i18n::kLeftToRightEmbeddingMark ||
- c == base::i18n::kRightToLeftEmbeddingMark ||
- c == base::i18n::kPopDirectionalFormatting ||
- c == base::i18n::kLeftToRightOverride ||
- c == base::i18n::kRightToLeftOverride;
-}
-
-// Returns the corresponding glyph range of the given character range.
-// |range| is in text-space (0 corresponds to |GetLayoutText()[0]|).
-// Returned value is in run-space (0 corresponds to the first glyph in the run).
-Range CharRangeToGlyphRange(const internal::TextRun& run,
- const Range& range) {
- DCHECK(run.range.Contains(range));
- DCHECK(!range.is_reversed());
- DCHECK(!range.is_empty());
- const Range run_range(range.start() - run.range.start(),
- range.end() - run.range.start());
- Range result;
- if (run.script_analysis.fRTL) {
- result = Range(run.logical_clusters[run_range.end() - 1],
- run_range.start() > 0 ? run.logical_clusters[run_range.start() - 1]
- : run.glyph_count);
- } else {
- result = Range(run.logical_clusters[run_range.start()],
- run_range.end() < run.range.length() ?
- run.logical_clusters[run_range.end()] : run.glyph_count);
- }
- DCHECK(!result.is_reversed());
- DCHECK(Range(0, run.glyph_count).Contains(result));
- return result;
-}
-
-// Starting from |start_char|, finds a suitable line break position at or before
-// |available_width| using word break info from |breaks|. If |empty_line| is
-// true, this function will not roll back to |start_char| and |*next_char| will
-// be greater than |start_char| (to avoid constructing empty lines). Returns
-// whether to skip the line before |*next_char|.
-// TODO(ckocagil): Do not break ligatures and diacritics.
-// TextRun::logical_clusters might help.
-// TODO(ckocagil): We might have to reshape after breaking at ligatures.
-// See whether resolving the TODO above resolves this too.
-// TODO(ckocagil): Do not reserve width for whitespace at the end of lines.
-bool BreakRunAtWidth(const wchar_t* text,
- const internal::TextRun& run,
- const BreakList<size_t>& breaks,
- size_t start_char,
- int available_width,
- bool empty_line,
- int* width,
- size_t* next_char) {
- DCHECK(run.range.Contains(Range(start_char, start_char + 1)));
- BreakList<size_t>::const_iterator word = breaks.GetBreak(start_char);
- BreakList<size_t>::const_iterator next_word = word + 1;
- // Width from |std::max(word->first, start_char)| to the current character.
- int word_width = 0;
- *width = 0;
-
- for (size_t i = start_char; i < run.range.end(); ++i) {
- if (U16_IS_SINGLE(text[i]) && text[i] == L'\n') {
- *next_char = i + 1;
- return true;
- }
-
- // |word| holds the word boundary at or before |i|, and |next_word| holds
- // the word boundary right after |i|. Advance both |word| and |next_word|
- // when |i| reaches |next_word|.
- if (next_word != breaks.breaks().end() && i >= next_word->first) {
- word = next_word++;
- word_width = 0;
- }
-
- Range glyph_range = CharRangeToGlyphRange(run, Range(i, i + 1));
- int char_width = 0;
- for (size_t j = glyph_range.start(); j < glyph_range.end(); ++j)
- char_width += run.advance_widths[j];
-
- *width += char_width;
- word_width += char_width;
-
- if (*width > available_width) {
- if (!empty_line || word_width < *width) {
- // Roll back one word.
- *width -= word_width;
- *next_char = std::max(word->first, start_char);
- } else if (char_width < *width) {
- // Roll back one character.
- *width -= char_width;
- *next_char = i;
- } else {
- // Continue from the next character.
- *next_char = i + 1;
- }
-
- return true;
- }
- }
-
- *next_char = run.range.end();
- return false;
-}
-
-// For segments in the same run, checks the continuity and order of |x_range|
-// and |char_range| fields.
-void CheckLineIntegrity(const std::vector<internal::Line>& lines,
- const ScopedVector<internal::TextRun>& runs) {
- size_t previous_segment_line = 0;
- const internal::LineSegment* previous_segment = NULL;
-
- for (size_t i = 0; i < lines.size(); ++i) {
- for (size_t j = 0; j < lines[i].segments.size(); ++j) {
- const internal::LineSegment* segment = &lines[i].segments[j];
- internal::TextRun* run = runs[segment->run];
-
- if (!previous_segment) {
- previous_segment = segment;
- } else if (runs[previous_segment->run] != run) {
- previous_segment = NULL;
- } else {
- DCHECK_EQ(previous_segment->char_range.end(),
- segment->char_range.start());
- if (!run->script_analysis.fRTL) {
- DCHECK_EQ(previous_segment->x_range.end(), segment->x_range.start());
- } else {
- DCHECK_EQ(segment->x_range.end(), previous_segment->x_range.start());
- }
-
- previous_segment = segment;
- previous_segment_line = i;
- }
- }
- }
-}
-
-// Returns true if characters of |block_code| may trigger font fallback.
-bool IsUnusualBlockCode(const UBlockCode block_code) {
- return block_code == UBLOCK_GEOMETRIC_SHAPES ||
- block_code == UBLOCK_MISCELLANEOUS_SYMBOLS;
-}
-
-// Returns the index of the first unusual character after a usual character or
-// vice versa. Unusual characters are defined by |IsUnusualBlockCode|.
-size_t FindUnusualCharacter(const base::string16& text,
- size_t run_start,
- size_t run_break) {
- const int32 run_length = static_cast<int32>(run_break - run_start);
- base::i18n::UTF16CharIterator iter(text.c_str() + run_start,
- run_length);
- const UBlockCode first_block_code = ublock_getCode(iter.get());
- const bool first_block_unusual = IsUnusualBlockCode(first_block_code);
- while (iter.Advance() && iter.array_pos() < run_length) {
- const UBlockCode current_block_code = ublock_getCode(iter.get());
- if (current_block_code != first_block_code &&
- (first_block_unusual || IsUnusualBlockCode(current_block_code))) {
- return run_start + iter.array_pos();
- }
- }
- return run_break;
-}
-
-} // namespace
-
-namespace internal {
-
-TextRun::TextRun()
- : font_style(0),
- strike(false),
- diagonal_strike(false),
- underline(false),
- width(0),
- preceding_run_widths(0),
- glyph_count(0),
- script_cache(NULL) {
- memset(&script_analysis, 0, sizeof(script_analysis));
- memset(&abc_widths, 0, sizeof(abc_widths));
-}
-
-TextRun::~TextRun() {
- ScriptFreeCache(&script_cache);
-}
-
-// Returns the X coordinate of the leading or |trailing| edge of the glyph
-// starting at |index|, relative to the left of the text (not the view).
-int GetGlyphXBoundary(const internal::TextRun* run,
- size_t index,
- bool trailing) {
- DCHECK_GE(index, run->range.start());
- DCHECK_LT(index, run->range.end() + (trailing ? 0 : 1));
- int x = 0;
- HRESULT hr = ScriptCPtoX(
- index - run->range.start(),
- trailing,
- run->range.length(),
- run->glyph_count,
- run->logical_clusters.get(),
- run->visible_attributes.get(),
- run->advance_widths.get(),
- &run->script_analysis,
- &x);
- DCHECK(SUCCEEDED(hr));
- return run->preceding_run_widths + x;
-}
-
-// Internal class to generate Line structures. If |multiline| is true, the text
-// is broken into lines at |words| boundaries such that each line is no longer
-// than |max_width|. If |multiline| is false, only outputs a single Line from
-// the given runs. |min_baseline| and |min_height| are the minimum baseline and
-// height for each line.
-// TODO(ckocagil): Expose the interface of this class in the header and test
-// this class directly.
-class LineBreaker {
- public:
- LineBreaker(int max_width,
- int min_baseline,
- int min_height,
- bool multiline,
- const wchar_t* text,
- const BreakList<size_t>* words,
- const ScopedVector<TextRun>& runs)
- : max_width_(max_width),
- min_baseline_(min_baseline),
- min_height_(min_height),
- multiline_(multiline),
- text_(text),
- words_(words),
- runs_(runs),
- text_x_(0),
- line_x_(0),
- line_ascent_(0),
- line_descent_(0) {
- AdvanceLine();
- }
-
- // Breaks the run at given |run_index| into Line structs.
- void AddRun(int run_index) {
- const TextRun* run = runs_[run_index];
- bool run_fits = !multiline_;
- if (multiline_ && line_x_ + run->width <= max_width_) {
- DCHECK(!run->range.is_empty());
- const wchar_t first_char = text_[run->range.start()];
- // Uniscribe always puts newline characters in their own runs.
- if (!U16_IS_SINGLE(first_char) || first_char != L'\n')
- run_fits = true;
- }
-
- if (!run_fits)
- BreakRun(run_index);
- else
- AddSegment(run_index, run->range, run->width);
- }
-
- // Finishes line breaking and outputs the results. Can be called at most once.
- void Finalize(std::vector<Line>* lines, Size* size) {
- DCHECK(!lines_.empty());
- // Add an empty line to finish the line size calculation and remove it.
- AdvanceLine();
- lines_.pop_back();
- *size = total_size_;
- lines->swap(lines_);
- }
-
- private:
- // A (line index, segment index) pair that specifies a segment in |lines_|.
- typedef std::pair<size_t, size_t> SegmentHandle;
-
- LineSegment* SegmentFromHandle(const SegmentHandle& handle) {
- return &lines_[handle.first].segments[handle.second];
- }
-
- // Breaks a run into segments that fit in the last line in |lines_| and adds
- // them. Adds a new Line to the back of |lines_| whenever a new segment can't
- // be added without the Line's width exceeding |max_width_|.
- void BreakRun(int run_index) {
- DCHECK(words_);
- const TextRun* const run = runs_[run_index];
- int width = 0;
- size_t next_char = run->range.start();
-
- // Break the run until it fits the current line.
- while (next_char < run->range.end()) {
- const size_t current_char = next_char;
- const bool skip_line = BreakRunAtWidth(text_, *run, *words_, current_char,
- max_width_ - line_x_, line_x_ == 0, &width, &next_char);
- AddSegment(run_index, Range(current_char, next_char), width);
- if (skip_line)
- AdvanceLine();
- }
- }
-
- // RTL runs are broken in logical order but displayed in visual order. To find
- // the text-space coordinate (where it would fall in a single-line text)
- // |x_range| of RTL segments, segment widths are applied in reverse order.
- // e.g. {[5, 10], [10, 40]} will become {[35, 40], [5, 35]}.
- void UpdateRTLSegmentRanges() {
- if (rtl_segments_.empty())
- return;
- int x = SegmentFromHandle(rtl_segments_[0])->x_range.start();
- for (size_t i = rtl_segments_.size(); i > 0; --i) {
- LineSegment* segment = SegmentFromHandle(rtl_segments_[i - 1]);
- const size_t segment_width = segment->x_range.length();
- segment->x_range = Range(x, x + segment_width);
- x += segment_width;
- }
- rtl_segments_.clear();
- }
-
- // Finishes the size calculations of the last Line in |lines_|. Adds a new
- // Line to the back of |lines_|.
- void AdvanceLine() {
- if (!lines_.empty()) {
- Line* line = &lines_.back();
- // TODO(ckocagil): Determine optimal multiline height behavior.
- if (line_ascent_ + line_descent_ == 0) {
- line_ascent_ = min_baseline_;
- line_descent_ = min_height_ - min_baseline_;
- }
- // Set the single-line mode Line's metrics to be at least
- // |RenderText::font_list()| to not break the current single-line code.
- line_ascent_ = std::max(line_ascent_, min_baseline_);
- line_descent_ = std::max(line_descent_, min_height_ - min_baseline_);
-
- line->baseline = line_ascent_;
- line->size.set_height(line_ascent_ + line_descent_);
- line->preceding_heights = total_size_.height();
- const Size line_size(ToCeiledSize(line->size));
- total_size_.set_height(total_size_.height() + line_size.height());
- total_size_.set_width(std::max(total_size_.width(), line_size.width()));
- }
- line_x_ = 0;
- line_ascent_ = 0;
- line_descent_ = 0;
- lines_.push_back(Line());
- }
-
- // Adds a new segment with the given properties to |lines_.back()|.
- void AddSegment(int run_index, Range char_range, int width) {
- if (char_range.is_empty()) {
- DCHECK_EQ(width, 0);
- return;
- }
- const TextRun* run = runs_[run_index];
- line_ascent_ = std::max(line_ascent_, run->font.GetBaseline());
- line_descent_ = std::max(line_descent_,
- run->font.GetHeight() - run->font.GetBaseline());
-
- LineSegment segment;
- segment.run = run_index;
- segment.char_range = char_range;
- segment.x_range = Range(text_x_, text_x_ + width);
-
- Line* line = &lines_.back();
- line->segments.push_back(segment);
- line->size.set_width(line->size.width() + segment.x_range.length());
- if (run->script_analysis.fRTL) {
- rtl_segments_.push_back(SegmentHandle(lines_.size() - 1,
- line->segments.size() - 1));
- // If this is the last segment of an RTL run, reprocess the text-space x
- // ranges of all segments from the run.
- if (char_range.end() == run->range.end())
- UpdateRTLSegmentRanges();
- }
- text_x_ += width;
- line_x_ += width;
- }
-
- const int max_width_;
- const int min_baseline_;
- const int min_height_;
- const bool multiline_;
- const wchar_t* text_;
- const BreakList<size_t>* const words_;
- const ScopedVector<TextRun>& runs_;
-
- // Stores the resulting lines.
- std::vector<Line> lines_;
-
- // Text space and line space x coordinates of the next segment to be added.
- int text_x_;
- int line_x_;
-
- // Size of the multiline text, not including the currently processed line.
- Size total_size_;
-
- // Ascent and descent values of the current line, |lines_.back()|.
- int line_ascent_;
- int line_descent_;
-
- // The current RTL run segments, to be applied by |UpdateRTLSegmentRanges()|.
- std::vector<SegmentHandle> rtl_segments_;
-
- DISALLOW_COPY_AND_ASSIGN(LineBreaker);
-};
-
-} // namespace internal
-
-// static
-HDC RenderTextWin::cached_hdc_ = NULL;
-
-// static
-std::map<std::string, Font> RenderTextWin::successful_substitute_fonts_;
-
-RenderTextWin::RenderTextWin() : RenderText(), needs_layout_(false) {
- set_truncate_length(kMaxUniscribeTextLength);
- memset(&script_control_, 0, sizeof(script_control_));
- memset(&script_state_, 0, sizeof(script_state_));
- MoveCursorTo(EdgeSelectionModel(CURSOR_LEFT));
-}
-
-RenderTextWin::~RenderTextWin() {}
-
-scoped_ptr<RenderText> RenderTextWin::CreateInstanceOfSameType() const {
- return scoped_ptr<RenderTextWin>(new RenderTextWin);
-}
-
-Size RenderTextWin::GetStringSize() {
- EnsureLayout();
- return multiline_string_size_;
-}
-
-SelectionModel RenderTextWin::FindCursorPosition(const Point& point) {
- if (text().empty())
- return SelectionModel();
-
- EnsureLayout();
- // Find the run that contains the point and adjust the argument location.
- int x = ToTextPoint(point).x();
- size_t run_index = GetRunContainingXCoord(x);
- if (run_index >= runs_.size())
- return EdgeSelectionModel((x < 0) ? CURSOR_LEFT : CURSOR_RIGHT);
- internal::TextRun* run = runs_[run_index];
-
- int position = 0, trailing = 0;
- HRESULT hr = ScriptXtoCP(x - run->preceding_run_widths,
- run->range.length(),
- run->glyph_count,
- run->logical_clusters.get(),
- run->visible_attributes.get(),
- run->advance_widths.get(),
- &(run->script_analysis),
- &position,
- &trailing);
- DCHECK(SUCCEEDED(hr));
- DCHECK_GE(trailing, 0);
- position += run->range.start();
- const size_t cursor = LayoutIndexToTextIndex(position + trailing);
- DCHECK_LE(cursor, text().length());
- return SelectionModel(cursor, trailing ? CURSOR_BACKWARD : CURSOR_FORWARD);
-}
-
-std::vector<RenderText::FontSpan> RenderTextWin::GetFontSpansForTesting() {
- EnsureLayout();
-
- std::vector<RenderText::FontSpan> spans;
- for (size_t i = 0; i < runs_.size(); ++i) {
- spans.push_back(RenderText::FontSpan(runs_[i]->font,
- Range(LayoutIndexToTextIndex(runs_[i]->range.start()),
- LayoutIndexToTextIndex(runs_[i]->range.end()))));
- }
-
- return spans;
-}
-
-int RenderTextWin::GetLayoutTextBaseline() {
- EnsureLayout();
- return lines()[0].baseline;
-}
-
-SelectionModel RenderTextWin::AdjacentCharSelectionModel(
- const SelectionModel& selection,
- VisualCursorDirection direction) {
- DCHECK(!needs_layout_);
- internal::TextRun* run;
- size_t run_index = GetRunContainingCaret(selection);
- if (run_index >= runs_.size()) {
- // The cursor is not in any run: we're at the visual and logical edge.
- SelectionModel edge = EdgeSelectionModel(direction);
- if (edge.caret_pos() == selection.caret_pos())
- return edge;
- int visual_index = (direction == CURSOR_RIGHT) ? 0 : runs_.size() - 1;
- run = runs_[visual_to_logical_[visual_index]];
- } else {
- // If the cursor is moving within the current run, just move it by one
- // grapheme in the appropriate direction.
- run = runs_[run_index];
- size_t caret = selection.caret_pos();
- bool forward_motion =
- run->script_analysis.fRTL == (direction == CURSOR_LEFT);
- if (forward_motion) {
- if (caret < LayoutIndexToTextIndex(run->range.end())) {
- caret = IndexOfAdjacentGrapheme(caret, CURSOR_FORWARD);
- return SelectionModel(caret, CURSOR_BACKWARD);
- }
- } else {
- if (caret > LayoutIndexToTextIndex(run->range.start())) {
- caret = IndexOfAdjacentGrapheme(caret, CURSOR_BACKWARD);
- return SelectionModel(caret, CURSOR_FORWARD);
- }
- }
- // The cursor is at the edge of a run; move to the visually adjacent run.
- int visual_index = logical_to_visual_[run_index];
- visual_index += (direction == CURSOR_LEFT) ? -1 : 1;
- if (visual_index < 0 || visual_index >= static_cast<int>(runs_.size()))
- return EdgeSelectionModel(direction);
- run = runs_[visual_to_logical_[visual_index]];
- }
- bool forward_motion = run->script_analysis.fRTL == (direction == CURSOR_LEFT);
- return forward_motion ? FirstSelectionModelInsideRun(run) :
- LastSelectionModelInsideRun(run);
-}
-
-// TODO(msw): Implement word breaking for Windows.
-SelectionModel RenderTextWin::AdjacentWordSelectionModel(
- const SelectionModel& selection,
- VisualCursorDirection direction) {
- if (obscured())
- return EdgeSelectionModel(direction);
-
- base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD);
- bool success = iter.Init();
- DCHECK(success);
- if (!success)
- return selection;
-
- size_t pos;
- if (direction == CURSOR_RIGHT) {
- pos = std::min(selection.caret_pos() + 1, text().length());
- while (iter.Advance()) {
- pos = iter.pos();
- if (iter.IsWord() && pos > selection.caret_pos())
- break;
- }
- } else { // direction == CURSOR_LEFT
- // Notes: We always iterate words from the beginning.
- // This is probably fast enough for our usage, but we may
- // want to modify WordIterator so that it can start from the
- // middle of string and advance backwards.
- pos = std::max<int>(selection.caret_pos() - 1, 0);
- while (iter.Advance()) {
- if (iter.IsWord()) {
- size_t begin = iter.pos() - iter.GetString().length();
- if (begin == selection.caret_pos()) {
- // The cursor is at the beginning of a word.
- // Move to previous word.
- break;
- } else if (iter.pos() >= selection.caret_pos()) {
- // The cursor is in the middle or at the end of a word.
- // Move to the top of current word.
- pos = begin;
- break;
- } else {
- pos = iter.pos() - iter.GetString().length();
- }
- }
- }
- }
- return SelectionModel(pos, CURSOR_FORWARD);
-}
-
-Range RenderTextWin::GetGlyphBounds(size_t index) {
- EnsureLayout();
- const size_t run_index =
- GetRunContainingCaret(SelectionModel(index, CURSOR_FORWARD));
- // Return edge bounds if the index is invalid or beyond the layout text size.
- if (run_index >= runs_.size())
- return Range(string_width_);
- internal::TextRun* run = runs_[run_index];
- const size_t layout_index = TextIndexToLayoutIndex(index);
- return Range(GetGlyphXBoundary(run, layout_index, false),
- GetGlyphXBoundary(run, layout_index, true));
-}
-
-std::vector<Rect> RenderTextWin::GetSubstringBounds(const Range& range) {
- DCHECK(!needs_layout_);
- DCHECK(Range(0, text().length()).Contains(range));
- Range layout_range(TextIndexToLayoutIndex(range.start()),
- TextIndexToLayoutIndex(range.end()));
- DCHECK(Range(0, GetLayoutText().length()).Contains(layout_range));
-
- std::vector<Rect> rects;
- if (layout_range.is_empty())
- return rects;
- std::vector<Range> bounds;
-
- // Add a Range for each run/selection intersection.
- // TODO(msw): The bounds should probably not always be leading the range ends.
- for (size_t i = 0; i < runs_.size(); ++i) {
- const internal::TextRun* run = runs_[visual_to_logical_[i]];
- Range intersection = run->range.Intersect(layout_range);
- if (intersection.IsValid()) {
- DCHECK(!intersection.is_reversed());
- Range range_x(GetGlyphXBoundary(run, intersection.start(), false),
- GetGlyphXBoundary(run, intersection.end(), false));
- if (range_x.is_empty())
- continue;
- range_x = Range(range_x.GetMin(), range_x.GetMax());
- // Union this with the last range if they're adjacent.
- DCHECK(bounds.empty() || bounds.back().GetMax() <= range_x.GetMin());
- if (!bounds.empty() && bounds.back().GetMax() == range_x.GetMin()) {
- range_x = Range(bounds.back().GetMin(), range_x.GetMax());
- bounds.pop_back();
- }
- bounds.push_back(range_x);
- }
- }
- for (size_t i = 0; i < bounds.size(); ++i) {
- std::vector<Rect> current_rects = TextBoundsToViewBounds(bounds[i]);
- rects.insert(rects.end(), current_rects.begin(), current_rects.end());
- }
- return rects;
-}
-
-size_t RenderTextWin::TextIndexToLayoutIndex(size_t index) const {
- DCHECK_LE(index, text().length());
- ptrdiff_t i = obscured() ? UTF16IndexToOffset(text(), 0, index) : index;
- CHECK_GE(i, 0);
- // Clamp layout indices to the length of the text actually used for layout.
- return std::min<size_t>(GetLayoutText().length(), i);
-}
-
-size_t RenderTextWin::LayoutIndexToTextIndex(size_t index) const {
- if (!obscured())
- return index;
-
- DCHECK_LE(index, GetLayoutText().length());
- const size_t text_index = UTF16OffsetToIndex(text(), 0, index);
- DCHECK_LE(text_index, text().length());
- return text_index;
-}
-
-bool RenderTextWin::IsValidCursorIndex(size_t index) {
- if (index == 0 || index == text().length())
- return true;
- if (!IsValidLogicalIndex(index))
- return false;
- EnsureLayout();
- // Disallow indices amid multi-character graphemes by checking glyph bounds.
- // These characters are not surrogate-pairs, but may yield a single glyph:
- // \x0915\x093f - (ki) - one of many Devanagari biconsonantal conjuncts.
- // \x0e08\x0e33 - (cho chan + sara am) - a Thai consonant and vowel pair.
- return GetGlyphBounds(index) != GetGlyphBounds(index - 1);
-}
-
-void RenderTextWin::ResetLayout() {
- // Layout is performed lazily as needed for drawing/metrics.
- needs_layout_ = true;
-}
-
-void RenderTextWin::EnsureLayout() {
- if (needs_layout_) {
- // TODO(msw): Skip complex processing if ScriptIsComplex returns false.
- ItemizeLogicalText();
- if (!runs_.empty())
- LayoutVisualText();
- needs_layout_ = false;
- std::vector<internal::Line> lines;
- set_lines(&lines);
- }
-
- // Compute lines if they're not valid. This is separate from the layout steps
- // above to avoid text layout and shaping when we resize |display_rect_|.
- if (lines().empty()) {
- DCHECK(!needs_layout_);
- std::vector<internal::Line> lines;
- internal::LineBreaker line_breaker(display_rect().width() - 1,
- font_list().GetBaseline(),
- font_list().GetHeight(), multiline(),
- GetLayoutText().c_str(),
- multiline() ? &GetLineBreaks() : NULL,
- runs_);
- for (size_t i = 0; i < runs_.size(); ++i)
- line_breaker.AddRun(visual_to_logical_[i]);
- line_breaker.Finalize(&lines, &multiline_string_size_);
- DCHECK(!lines.empty());
-#ifndef NDEBUG
- CheckLineIntegrity(lines, runs_);
-#endif
- set_lines(&lines);
- }
-}
-
-void RenderTextWin::DrawVisualText(Canvas* canvas) {
- DCHECK(!needs_layout_);
- DCHECK(!lines().empty());
-
- std::vector<SkPoint> pos;
-
- internal::SkiaTextRenderer renderer(canvas);
- ApplyFadeEffects(&renderer);
- ApplyTextShadows(&renderer);
-
- renderer.SetFontRenderParams(
- font_list().GetPrimaryFont().GetFontRenderParams(),
- background_is_transparent());
-
- ApplyCompositionAndSelectionStyles();
-
- for (size_t i = 0; i < lines().size(); ++i) {
- const internal::Line& line = lines()[i];
- const Vector2d line_offset = GetLineOffset(i);
-
- // Skip painting empty lines or lines outside the display rect area.
- if (!display_rect().Intersects(Rect(PointAtOffsetFromOrigin(line_offset),
- ToCeiledSize(line.size))))
- continue;
-
- const Vector2d text_offset = line_offset + Vector2d(0, line.baseline);
- int preceding_segment_widths = 0;
-
- for (size_t j = 0; j < line.segments.size(); ++j) {
- const internal::LineSegment* segment = &line.segments[j];
- const int segment_width = segment->x_range.length();
- const internal::TextRun* run = runs_[segment->run];
- DCHECK(!segment->char_range.is_empty());
- DCHECK(run->range.Contains(segment->char_range));
- Range glyph_range = CharRangeToGlyphRange(*run, segment->char_range);
- DCHECK(!glyph_range.is_empty());
- // Skip painting segments outside the display rect area.
- if (!multiline()) {
- const Rect segment_bounds(PointAtOffsetFromOrigin(line_offset) +
- Vector2d(preceding_segment_widths, 0),
- Size(segment_width, line.size.height()));
- if (!display_rect().Intersects(segment_bounds)) {
- preceding_segment_widths += segment_width;
- continue;
- }
- }
-
- // |pos| contains the positions of glyphs. An extra terminal |pos| entry
- // is added to simplify width calculations.
- int segment_x = preceding_segment_widths;
- pos.resize(glyph_range.length() + 1);
- for (size_t k = glyph_range.start(); k < glyph_range.end(); ++k) {
- pos[k - glyph_range.start()].set(
- SkIntToScalar(text_offset.x() + run->offsets[k].du + segment_x),
- SkIntToScalar(text_offset.y() - run->offsets[k].dv));
- segment_x += run->advance_widths[k];
- }
- pos.back().set(SkIntToScalar(text_offset.x() + segment_x),
- SkIntToScalar(text_offset.y()));
-
- renderer.SetTextSize(SkIntToScalar(run->font.GetFontSize()));
- renderer.SetFontFamilyWithStyle(run->font.GetFontName(), run->font_style);
-
- for (BreakList<SkColor>::const_iterator it =
- colors().GetBreak(segment->char_range.start());
- it != colors().breaks().end() &&
- it->first < segment->char_range.end();
- ++it) {
- const Range intersection =
- colors().GetRange(it).Intersect(segment->char_range);
- const Range colored_glyphs = CharRangeToGlyphRange(*run, intersection);
- // The range may be empty if a portion of a multi-character grapheme is
- // selected, yielding two colors for a single glyph. For now, this just
- // paints the glyph with a single style, but it should paint it twice,
- // clipped according to selection bounds. See http://crbug.com/366786
- if (colored_glyphs.is_empty())
- continue;
- DCHECK(glyph_range.Contains(colored_glyphs));
- const SkPoint& start_pos =
- pos[colored_glyphs.start() - glyph_range.start()];
- const SkPoint& end_pos =
- pos[colored_glyphs.end() - glyph_range.start()];
-
- renderer.SetForegroundColor(it->second);
- renderer.DrawPosText(&start_pos, &run->glyphs[colored_glyphs.start()],
- colored_glyphs.length());
- int start_x = SkScalarRoundToInt(start_pos.x());
- renderer.DrawDecorations(
- start_x, text_offset.y(), SkScalarRoundToInt(end_pos.x()) - start_x,
- run->underline, run->strike, run->diagonal_strike);
- }
-
- preceding_segment_widths += segment_width;
- }
-
- renderer.EndDiagonalStrike();
- }
-
- UndoCompositionAndSelectionStyles();
-}
-
-void RenderTextWin::ItemizeLogicalText() {
- runs_.clear();
- string_width_ = 0;
- multiline_string_size_ = Size();
-
- // Set Uniscribe's base text direction.
- script_state_.uBidiLevel =
- (GetTextDirection() == base::i18n::RIGHT_TO_LEFT) ? 1 : 0;
-
- const base::string16& layout_text = GetLayoutText();
- if (layout_text.empty())
- return;
-
- HRESULT hr = E_OUTOFMEMORY;
- int script_items_count = 0;
- std::vector<SCRIPT_ITEM> script_items;
- const size_t layout_text_length = layout_text.length();
- // Ensure that |kMaxRuns| is attempted and the loop terminates afterward.
- for (size_t runs = kGuessRuns; hr == E_OUTOFMEMORY && runs <= kMaxRuns;
- runs = std::max(runs + 1, std::min(runs * 2, kMaxRuns))) {
- // Derive the array of Uniscribe script items from the logical text.
- // ScriptItemize always adds a terminal array item so that the length of
- // the last item can be derived from the terminal SCRIPT_ITEM::iCharPos.
- script_items.resize(runs);
- hr = ScriptItemize(layout_text.c_str(), layout_text_length, runs - 1,
- &script_control_, &script_state_, &script_items[0],
- &script_items_count);
- }
- DCHECK(SUCCEEDED(hr));
- if (!SUCCEEDED(hr) || script_items_count <= 0)
- return;
-
- // Temporarily apply composition underlines and selection colors.
- ApplyCompositionAndSelectionStyles();
-
- // Build the list of runs from the script items and ranged styles. Use an
- // empty color BreakList to avoid breaking runs at color boundaries.
- BreakList<SkColor> empty_colors;
- empty_colors.SetMax(layout_text_length);
- internal::StyleIterator style(empty_colors, styles());
- SCRIPT_ITEM* script_item = &script_items[0];
- const size_t max_run_length = kMaxGlyphs / 2;
- for (size_t run_break = 0; run_break < layout_text_length;) {
- internal::TextRun* run = new internal::TextRun();
- run->range.set_start(run_break);
- run->font = font_list().GetPrimaryFont();
- run->font_style = (style.style(BOLD) ? Font::BOLD : 0) |
- (style.style(ITALIC) ? Font::ITALIC : 0);
- DeriveFontIfNecessary(run->font.GetFontSize(), run->font.GetHeight(),
- run->font_style, &run->font);
- run->strike = style.style(STRIKE);
- run->diagonal_strike = style.style(DIAGONAL_STRIKE);
- run->underline = style.style(UNDERLINE);
- run->script_analysis = script_item->a;
-
- // Find the next break and advance the iterators as needed.
- const size_t script_item_break = (script_item + 1)->iCharPos;
- run_break = std::min(script_item_break,
- TextIndexToLayoutIndex(style.GetRange().end()));
-
- // Clamp run lengths to avoid exceeding the maximum supported glyph count.
- if ((run_break - run->range.start()) > max_run_length) {
- run_break = run->range.start() + max_run_length;
- if (!IsValidCodePointIndex(layout_text, run_break))
- --run_break;
- }
-
- // Break runs adjacent to character substrings in certain code blocks.
- // This avoids using their fallback fonts for more characters than needed,
- // in cases like "\x25B6 Media Title", etc. http://crbug.com/278913
- if (run_break > run->range.start()) {
- run_break =
- FindUnusualCharacter(layout_text, run->range.start(), run_break);
- }
-
- DCHECK(IsValidCodePointIndex(layout_text, run_break));
-
- style.UpdatePosition(LayoutIndexToTextIndex(run_break));
- if (script_item_break == run_break)
- script_item++;
- run->range.set_end(run_break);
- runs_.push_back(run);
- }
-
- // Undo the temporarily applied composition underlines and selection colors.
- UndoCompositionAndSelectionStyles();
-}
-
-void RenderTextWin::LayoutVisualText() {
- DCHECK(!runs_.empty());
-
- if (!cached_hdc_)
- cached_hdc_ = CreateCompatibleDC(NULL);
-
- HRESULT hr = E_FAIL;
- // Ensure ascent and descent are not smaller than ones of the font list.
- // Keep them tall enough to draw often-used characters.
- // For example, if a text field contains a Japanese character, which is
- // smaller than Latin ones, and then later a Latin one is inserted, this
- // ensures that the text baseline does not shift.
- int ascent = font_list().GetBaseline();
- int descent = font_list().GetHeight() - font_list().GetBaseline();
- for (size_t i = 0; i < runs_.size(); ++i) {
- internal::TextRun* run = runs_[i];
- LayoutTextRun(run);
-
- ascent = std::max(ascent, run->font.GetBaseline());
- descent = std::max(descent,
- run->font.GetHeight() - run->font.GetBaseline());
-
- if (run->glyph_count > 0) {
- run->advance_widths.reset(new int[run->glyph_count]);
- run->offsets.reset(new GOFFSET[run->glyph_count]);
- hr = ScriptPlace(cached_hdc_,
- &run->script_cache,
- run->glyphs.get(),
- run->glyph_count,
- run->visible_attributes.get(),
- &(run->script_analysis),
- run->advance_widths.get(),
- run->offsets.get(),
- &(run->abc_widths));
- DCHECK(SUCCEEDED(hr));
- }
- }
-
- // Build the array of bidirectional embedding levels.
- scoped_ptr<BYTE[]> levels(new BYTE[runs_.size()]);
- for (size_t i = 0; i < runs_.size(); ++i)
- levels[i] = runs_[i]->script_analysis.s.uBidiLevel;
-
- // Get the maps between visual and logical run indices.
- visual_to_logical_.reset(new int[runs_.size()]);
- logical_to_visual_.reset(new int[runs_.size()]);
- hr = ScriptLayout(runs_.size(),
- levels.get(),
- visual_to_logical_.get(),
- logical_to_visual_.get());
- DCHECK(SUCCEEDED(hr));
-
- // Precalculate run width information.
- size_t preceding_run_widths = 0;
- for (size_t i = 0; i < runs_.size(); ++i) {
- internal::TextRun* run = runs_[visual_to_logical_[i]];
- run->preceding_run_widths = preceding_run_widths;
- const ABC& abc = run->abc_widths;
- run->width = abc.abcA + abc.abcB + abc.abcC;
- preceding_run_widths += run->width;
- }
- string_width_ = preceding_run_widths;
-}
-
-void RenderTextWin::LayoutTextRun(internal::TextRun* run) {
- const size_t run_length = run->range.length();
- const wchar_t* run_text = &(GetLayoutText()[run->range.start()]);
- Font original_font = run->font;
-
- run->logical_clusters.reset(new WORD[run_length]);
-
- // Try shaping with |original_font|.
- Font current_font = original_font;
- int missing_count = CountCharsWithMissingGlyphs(run,
- ShapeTextRunWithFont(run, current_font));
- if (missing_count == 0)
- return;
-
- // Keep track of the font that is able to display the greatest number of
- // characters for which ScriptShape() returned S_OK. This font will be used
- // in the case where no font is able to display the entire run.
- int best_partial_font_missing_char_count = missing_count;
- Font best_partial_font = current_font;
-
- // Try to shape with the cached font from previous runs, if any.
- std::map<std::string, Font>::const_iterator it =
- successful_substitute_fonts_.find(original_font.GetFontName());
- if (it != successful_substitute_fonts_.end()) {
- current_font = it->second;
- missing_count = CountCharsWithMissingGlyphs(run,
- ShapeTextRunWithFont(run, current_font));
- if (missing_count == 0)
- return;
- if (missing_count < best_partial_font_missing_char_count) {
- best_partial_font_missing_char_count = missing_count;
- best_partial_font = current_font;
- }
- }
-
- // Try finding a fallback font using a meta file.
- // TODO(msw|asvitkine): Support RenderText's font_list()?
- Font uniscribe_font;
- bool got_uniscribe_font = false;
- if (GetUniscribeFallbackFont(original_font, run_text, run_length,
- &uniscribe_font)) {
- got_uniscribe_font = true;
- current_font = uniscribe_font;
- missing_count = CountCharsWithMissingGlyphs(run,
- ShapeTextRunWithFont(run, current_font));
- if (missing_count == 0) {
- successful_substitute_fonts_[original_font.GetFontName()] = current_font;
- return;
- }
- if (missing_count < best_partial_font_missing_char_count) {
- best_partial_font_missing_char_count = missing_count;
- best_partial_font = current_font;
- }
- }
-
- // Try fonts in the fallback list except the first, which is |original_font|.
- std::vector<std::string> fonts =
- GetFallbackFontFamilies(original_font.GetFontName());
- for (size_t i = 1; i < fonts.size(); ++i) {
- current_font = Font(fonts[i], original_font.GetFontSize());
- missing_count = CountCharsWithMissingGlyphs(run,
- ShapeTextRunWithFont(run, current_font));
- if (missing_count == 0) {
- successful_substitute_fonts_[original_font.GetFontName()] = current_font;
- return;
- }
- if (missing_count < best_partial_font_missing_char_count) {
- best_partial_font_missing_char_count = missing_count;
- best_partial_font = current_font;
- }
- }
-
- // Try fonts in the fallback list of the Uniscribe font.
- if (got_uniscribe_font) {
- fonts = GetFallbackFontFamilies(uniscribe_font.GetFontName());
- for (size_t i = 1; i < fonts.size(); ++i) {
- current_font = Font(fonts[i], original_font.GetFontSize());
- missing_count = CountCharsWithMissingGlyphs(run,
- ShapeTextRunWithFont(run, current_font));
- if (missing_count == 0) {
- successful_substitute_fonts_[original_font.GetFontName()] =
- current_font;
- return;
- }
- if (missing_count < best_partial_font_missing_char_count) {
- best_partial_font_missing_char_count = missing_count;
- best_partial_font = current_font;
- }
- }
- }
-
- // If a font was able to partially display the run, use that now.
- if (best_partial_font_missing_char_count < static_cast<int>(run_length)) {
- // Re-shape the run only if |best_partial_font| differs from the last font.
- if (best_partial_font.GetNativeFont() != run->font.GetNativeFont())
- ShapeTextRunWithFont(run, best_partial_font);
- return;
- }
-
- // If no font was able to partially display the run, replace all glyphs
- // with |wgDefault| from the original font to ensure to they don't hold
- // garbage values.
- // First, clear the cache and select the original font on the HDC.
- ScriptFreeCache(&run->script_cache);
- run->font = original_font;
- SelectObject(cached_hdc_, run->font.GetNativeFont());
-
- // Now, get the font's properties.
- SCRIPT_FONTPROPERTIES properties;
- memset(&properties, 0, sizeof(properties));
- properties.cBytes = sizeof(properties);
- HRESULT hr = ScriptGetFontProperties(cached_hdc_, &run->script_cache,
- &properties);
-
- // The initial values for the "missing" glyph and the space glyph are taken
- // from the recommendations section of the OpenType spec:
- // https://www.microsoft.com/typography/otspec/recom.htm
- WORD missing_glyph = 0;
- WORD space_glyph = 3;
- if (hr == S_OK) {
- missing_glyph = properties.wgDefault;
- space_glyph = properties.wgBlank;
- }
-
- // Finally, initialize |glyph_count|, |glyphs|, |visible_attributes| and
- // |logical_clusters| on the run (since they may not have been set yet).
- run->glyph_count = run_length;
- memset(run->visible_attributes.get(), 0,
- run->glyph_count * sizeof(SCRIPT_VISATTR));
- for (int i = 0; i < run->glyph_count; ++i)
- run->glyphs[i] = IsWhitespace(run_text[i]) ? space_glyph : missing_glyph;
- for (size_t i = 0; i < run_length; ++i) {
- run->logical_clusters[i] =
- static_cast<WORD>(run->script_analysis.fRTL ? run_length - 1 - i : i);
- }
-
- // TODO(msw): Don't use SCRIPT_UNDEFINED. Apparently Uniscribe can
- // crash on certain surrogate pairs with SCRIPT_UNDEFINED.
- // See https://bugzilla.mozilla.org/show_bug.cgi?id=341500
- // And http://maxradi.us/documents/uniscribe/
- run->script_analysis.eScript = SCRIPT_UNDEFINED;
-}
-
-HRESULT RenderTextWin::ShapeTextRunWithFont(internal::TextRun* run,
- const Font& font) {
- // Update the run's font only if necessary. If the two fonts wrap the same
- // PlatformFontWin object, their native fonts will have the same value.
- if (run->font.GetNativeFont() != font.GetNativeFont()) {
- const int font_size = run->font.GetFontSize();
- const int font_height = run->font.GetHeight();
- run->font = font;
- DeriveFontIfNecessary(font_size, font_height, run->font_style, &run->font);
- ScriptFreeCache(&run->script_cache);
- }
-
- // Select the font desired for glyph generation.
- SelectObject(cached_hdc_, run->font.GetNativeFont());
-
- HRESULT hr = E_OUTOFMEMORY;
- const size_t run_length = run->range.length();
- const wchar_t* run_text = &(GetLayoutText()[run->range.start()]);
- // Guess the expected number of glyphs from the length of the run.
- // MSDN suggests this at http://msdn.microsoft.com/en-us/library/dd368564.aspx
- size_t max_glyphs = static_cast<size_t>(1.5 * run_length + 16);
- while (hr == E_OUTOFMEMORY && max_glyphs <= kMaxGlyphs) {
- run->glyph_count = 0;
- run->glyphs.reset(new WORD[max_glyphs]);
- run->visible_attributes.reset(new SCRIPT_VISATTR[max_glyphs]);
- hr = ScriptShape(cached_hdc_, &run->script_cache, run_text, run_length,
- max_glyphs, &run->script_analysis, run->glyphs.get(),
- run->logical_clusters.get(), run->visible_attributes.get(),
- &run->glyph_count);
- // Ensure that |kMaxGlyphs| is attempted and the loop terminates afterward.
- max_glyphs = std::max(max_glyphs + 1, std::min(max_glyphs * 2, kMaxGlyphs));
- }
- return hr;
-}
-
-int RenderTextWin::CountCharsWithMissingGlyphs(internal::TextRun* run,
- HRESULT shaping_result) const {
- if (shaping_result != S_OK) {
- DCHECK_EQ(shaping_result, USP_E_SCRIPT_NOT_IN_FONT);
- return INT_MAX;
- }
-
- // If |hr| is S_OK, there could still be missing glyphs in the output.
- // http://msdn.microsoft.com/en-us/library/windows/desktop/dd368564.aspx
- int chars_not_missing_glyphs = 0;
- SCRIPT_FONTPROPERTIES properties;
- memset(&properties, 0, sizeof(properties));
- properties.cBytes = sizeof(properties);
- ScriptGetFontProperties(cached_hdc_, &run->script_cache, &properties);
-
- const wchar_t* run_text = &(GetLayoutText()[run->range.start()]);
- for (size_t char_index = 0; char_index < run->range.length(); ++char_index) {
- const int glyph_index = run->logical_clusters[char_index];
- DCHECK_GE(glyph_index, 0);
- DCHECK_LT(glyph_index, run->glyph_count);
-
- if (run->glyphs[glyph_index] == properties.wgDefault)
- continue;
-
- // Windows Vista sometimes returns glyphs equal to wgBlank (instead of
- // wgDefault), with fZeroWidth set. Treat such cases as having missing
- // glyphs if the corresponding character is not whitespace.
- // See: http://crbug.com/125629
- if (run->glyphs[glyph_index] == properties.wgBlank &&
- run->visible_attributes[glyph_index].fZeroWidth &&
- !IsWhitespace(run_text[char_index]) &&
- !IsUnicodeBidiControlCharacter(run_text[char_index])) {
- continue;
- }
-
- ++chars_not_missing_glyphs;
- }
-
- DCHECK_LE(chars_not_missing_glyphs, static_cast<int>(run->range.length()));
- return run->range.length() - chars_not_missing_glyphs;
-}
-
-size_t RenderTextWin::GetRunContainingCaret(const SelectionModel& caret) const {
- DCHECK(!needs_layout_);
- size_t layout_position = TextIndexToLayoutIndex(caret.caret_pos());
- LogicalCursorDirection affinity = caret.caret_affinity();
- for (size_t run = 0; run < runs_.size(); ++run)
- if (RangeContainsCaret(runs_[run]->range, layout_position, affinity))
- return run;
- return runs_.size();
-}
-
-size_t RenderTextWin::GetRunContainingXCoord(int x) const {
- DCHECK(!needs_layout_);
- // Find the text run containing the argument point (assumed already offset).
- for (size_t run = 0; run < runs_.size(); ++run) {
- if ((runs_[run]->preceding_run_widths <= x) &&
- ((runs_[run]->preceding_run_widths + runs_[run]->width) > x))
- return run;
- }
- return runs_.size();
-}
-
-SelectionModel RenderTextWin::FirstSelectionModelInsideRun(
- const internal::TextRun* run) {
- size_t position = LayoutIndexToTextIndex(run->range.start());
- position = IndexOfAdjacentGrapheme(position, CURSOR_FORWARD);
- return SelectionModel(position, CURSOR_BACKWARD);
-}
-
-SelectionModel RenderTextWin::LastSelectionModelInsideRun(
- const internal::TextRun* run) {
- size_t position = LayoutIndexToTextIndex(run->range.end());
- position = IndexOfAdjacentGrapheme(position, CURSOR_BACKWARD);
- return SelectionModel(position, CURSOR_FORWARD);
-}
-
-RenderText* RenderText::CreateNativeInstance() {
- return new RenderTextWin;
-}
-
-} // namespace gfx
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