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// 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.
#ifndef UI_GFX_RENDER_TEXT_WIN_H_
#define UI_GFX_RENDER_TEXT_WIN_H_
#include <usp10.h>
#include <map>
#include <string>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "ui/gfx/render_text.h"
namespace gfx {
namespace internal {
struct TextRun {
TextRun();
~TextRun();
Range range;
Font font;
// A gfx::Font::FontStyle flag to specify bold and italic styles.
// Supersedes |font.GetFontStyle()|. Stored separately to avoid calling
// |font.DeriveFont()|, which is expensive on Windows.
int font_style;
bool strike;
bool diagonal_strike;
bool underline;
int width;
// The cumulative widths of preceding runs.
int preceding_run_widths;
SCRIPT_ANALYSIS script_analysis;
scoped_ptr<WORD[]> glyphs;
scoped_ptr<WORD[]> logical_clusters;
scoped_ptr<SCRIPT_VISATTR[]> visible_attributes;
int glyph_count;
scoped_ptr<int[]> advance_widths;
scoped_ptr<GOFFSET[]> offsets;
ABC abc_widths;
SCRIPT_CACHE script_cache;
private:
DISALLOW_COPY_AND_ASSIGN(TextRun);
};
} // namespace internal
// RenderTextWin is the Windows implementation of RenderText using Uniscribe.
class RenderTextWin : public RenderText {
public:
RenderTextWin();
virtual ~RenderTextWin();
// Overridden from RenderText:
virtual scoped_ptr<RenderText> CreateInstanceOfSameType() const override;
virtual Size GetStringSize() override;
virtual SelectionModel FindCursorPosition(const Point& point) override;
virtual std::vector<FontSpan> GetFontSpansForTesting() override;
protected:
// Overridden from RenderText:
virtual int GetLayoutTextBaseline() override;
virtual SelectionModel AdjacentCharSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
virtual SelectionModel AdjacentWordSelectionModel(
const SelectionModel& selection,
VisualCursorDirection direction) override;
virtual Range GetGlyphBounds(size_t index) override;
virtual std::vector<Rect> GetSubstringBounds(const Range& range) override;
virtual size_t TextIndexToLayoutIndex(size_t index) const override;
virtual size_t LayoutIndexToTextIndex(size_t index) const override;
virtual bool IsValidCursorIndex(size_t index) override;
virtual void ResetLayout() override;
virtual void EnsureLayout() override;
virtual void DrawVisualText(Canvas* canvas) override;
private:
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Win_BreakRunsByUnicodeBlocks);
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Win_LogicalClusters);
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_MinWidth);
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_NormalWidth);
FRIEND_TEST_ALL_PREFIXES(RenderTextTest, BreakRunsByUnicodeBlocks);
void ItemizeLogicalText();
void LayoutVisualText();
void LayoutTextRun(internal::TextRun* run);
// Helper function that calls |ScriptShape()| on the run, which has logic to
// handle E_OUTOFMEMORY return codes.
HRESULT ShapeTextRunWithFont(internal::TextRun* run, const Font& font);
// Returns the number of characters in |run| that have missing glyphs.
int CountCharsWithMissingGlyphs(internal::TextRun* run,
HRESULT shaping_result) const;
// Return the run index that contains the argument; or the length of the
// |runs_| vector if argument exceeds the text length or width.
size_t GetRunContainingCaret(const SelectionModel& caret) const;
size_t GetRunContainingXCoord(int x) const;
// Given a |run|, returns the SelectionModel that contains the logical first
// or last caret position inside (not at a boundary of) the run.
// The returned value represents a cursor/caret position without a selection.
SelectionModel FirstSelectionModelInsideRun(const internal::TextRun* run);
SelectionModel LastSelectionModelInsideRun(const internal::TextRun* run);
// Cached HDC for performing Uniscribe API calls.
static HDC cached_hdc_;
// Cached map from font name to the last successful substitute font used.
// TODO(asvitkine): Move the caching logic to font_fallback_win.cc.
static std::map<std::string, Font> successful_substitute_fonts_;
SCRIPT_CONTROL script_control_;
SCRIPT_STATE script_state_;
ScopedVector<internal::TextRun> runs_;
// Single line width of the layout text.
int string_width_;
// Wrapped multiline size of the layout text.
Size multiline_string_size_;
scoped_ptr<int[]> visual_to_logical_;
scoped_ptr<int[]> logical_to_visual_;
bool needs_layout_;
DISALLOW_COPY_AND_ASSIGN(RenderTextWin);
};
} // namespace gfx
#endif // UI_GFX_RENDER_TEXT_WIN_H_
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