render_text_win.cc revision 7d4cd473f85ac64c3747c96c277f9e506a0d2246
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/render_text_win.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <algorithm> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/i18n/break_iterator.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/i18n/rtl.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 127d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/strings/string_util.h" 13868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/utf_string_conversions.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/win/windows_version.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/base/text/utf16_indexing.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/canvas.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/font_fallback_win.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/font_smoothing_win.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/platform_font_win.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace gfx { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The maximum supported number of Uniscribe runs; a SCRIPT_ITEM is 8 bytes. 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(msw): Review memory use/failure? Max string length? Alternate approach? 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const int kGuessItems = 100; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const int kMaxItems = 10000; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The maximum supported number of Uniscribe glyphs; a glyph is 1 word. 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(msw): Review memory use/failure? Max string length? Alternate approach? 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const int kMaxGlyphs = 100000; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Callback to |EnumEnhMetaFile()| to intercept font creation. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int CALLBACK MetaFileEnumProc(HDC hdc, 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HANDLETABLE* table, 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CONST ENHMETARECORD* record, 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int table_entries, 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LPARAM log_font) { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (record->iType == EMR_EXTCREATEFONTINDIRECTW) { 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const EMREXTCREATEFONTINDIRECTW* create_font_record = 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const EMREXTCREATEFONTINDIRECTW*>(record); 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *reinterpret_cast<LOGFONT*>(log_font) = create_font_record->elfw.elfLogFont; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Finds a fallback font to use to render the specified |text| with respect to 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// an initial |font|. Returns the resulting font via out param |result|. Returns 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// |true| if a fallback font was found. 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Adapted from WebKit's |FontCache::GetFontDataForCharacters()|. 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(asvitkine): This should be moved to font_fallback_win.cc. 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ChooseFallbackFont(HDC hdc, 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Font& font, 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* text, 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int text_length, 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font* result) { 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use a meta file to intercept the fallback font chosen by Uniscribe. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HDC meta_file_dc = CreateEnhMetaFile(hdc, NULL, NULL, NULL); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!meta_file_dc) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(meta_file_dc, font.GetNativeFont()); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_STRING_ANALYSIS script_analysis; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hresult = 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptStringAnalyse(meta_file_dc, text, text_length, 0, -1, 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SSA_METAFILE | SSA_FALLBACK | SSA_GLYPHS | SSA_LINK, 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 0, NULL, NULL, NULL, NULL, NULL, &script_analysis); 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (SUCCEEDED(hresult)) { 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hresult = ScriptStringOut(script_analysis, 0, 0, 0, NULL, 0, 0, FALSE); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptStringFree(&script_analysis); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool found_fallback = false; 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HENHMETAFILE meta_file = CloseEnhMetaFile(meta_file_dc); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (SUCCEEDED(hresult)) { 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LOGFONT log_font; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) log_font.lfFaceName[0] = 0; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnumEnhMetaFile(0, meta_file, MetaFileEnumProc, &log_font, NULL); 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (log_font.lfFaceName[0]) { 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *result = Font(UTF16ToUTF8(log_font.lfFaceName), font.GetFontSize()); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) found_fallback = true; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeleteEnhMetaFile(meta_file); 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return found_fallback; 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Changes |font| to have the specified |font_size| (or |font_height| on Windows 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// XP) and |font_style| if it is not the case already. Only considers bold and 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// italic styles, since the underlined style has no effect on glyph shaping. 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void DeriveFontIfNecessary(int font_size, 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int font_height, 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int font_style, 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font* font) { 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int kStyleMask = (Font::BOLD | Font::ITALIC); 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int target_style = (font_style & kStyleMask); 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // On Windows XP, the font must be resized using |font_height| instead of 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |font_size| to match GDI behavior. 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (base::win::GetVersion() < base::win::VERSION_VISTA) { 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PlatformFontWin* platform_font = 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<PlatformFontWin*>(font->platform_font()); 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *font = platform_font->DeriveFontWithHeight(font_height, target_style); 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int current_style = (font->GetStyle() & kStyleMask); 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int current_size = font->GetFontSize(); 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (current_style != target_style || current_size != font_size) 1142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) *font = font->DeriveFont(font_size - current_size, target_style); 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Returns true if |c| is a Unicode BiDi control character. 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool IsUnicodeBidiControlCharacter(char16 c) { 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return c == base::i18n::kRightToLeftMark || 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightMark || 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightEmbeddingMark || 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kRightToLeftEmbeddingMark || 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kPopDirectionalFormatting || 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightOverride || 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kRightToLeftOverride; 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace internal { 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextRun::TextRun() 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : foreground(0), 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) font_style(0), 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) strike(false), 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) diagonal_strike(false), 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) underline(false), 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) width(0), 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) preceding_run_widths(0), 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyph_count(0), 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_cache(NULL) { 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_analysis, 0, sizeof(script_analysis)); 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&abc_widths, 0, sizeof(abc_widths)); 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextRun::~TextRun() { 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&script_cache); 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Returns the X coordinate of the leading or |trailing| edge of the glyph 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// starting at |index|, relative to the left of the text (not the view). 15290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)int GetGlyphXBoundary(const internal::TextRun* run, 15390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) size_t index, 15490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) bool trailing) { 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(index, run->range.start()); 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(index, run->range.end() + (trailing ? 0 : 1)); 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int x = 0; 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ScriptCPtoX( 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) index - run->range.start(), 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) trailing, 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.length(), 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.get(), 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_analysis, 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &x); 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return run->preceding_run_widths + x; 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace internal 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HDC RenderTextWin::cached_hdc_ = NULL; 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::map<std::string, Font> RenderTextWin::successful_substitute_fonts_; 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderTextWin::RenderTextWin() 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : RenderText(), 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) common_baseline_(0), 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_(false) { 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_control_, 0, sizeof(script_control_)); 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_state_, 0, sizeof(script_state_)); 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MoveCursorTo(EdgeSelectionModel(CURSOR_LEFT)); 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderTextWin::~RenderTextWin() { 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Size RenderTextWin::GetStringSize() { 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return string_size_; 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int RenderTextWin::GetBaseline() { 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return common_baseline_; 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::FindCursorPosition(const Point& point) { 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text().empty()) 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(); 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Find the run that contains the point and adjust the argument location. 20990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int x = ToTextPoint(point).x(); 21090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) size_t run_index = GetRunContainingXCoord(x); 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run_index == runs_.size()) 21290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return EdgeSelectionModel((x < 0) ? CURSOR_LEFT : CURSOR_RIGHT); 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[run_index]; 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int position = 0, trailing = 0; 21690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) HRESULT hr = ScriptXtoCP(x - run->preceding_run_widths, 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.length(), 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.get(), 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->script_analysis), 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &position, 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &trailing); 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(trailing, 0); 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position += run->range.start(); 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t cursor = LayoutIndexToTextIndex(position + trailing); 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(cursor, text().length()); 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(cursor, trailing ? CURSOR_BACKWARD : CURSOR_FORWARD); 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::vector<RenderText::FontSpan> RenderTextWin::GetFontSpansForTesting() { 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<RenderText::FontSpan> spans; 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) spans.push_back(RenderText::FontSpan(runs_[i]->font, 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ui::Range(LayoutIndexToTextIndex(runs_[i]->range.start()), 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutIndexToTextIndex(runs_[i]->range.end())))); 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return spans; 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::AdjacentCharSelectionModel( 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SelectionModel& selection, 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VisualCursorDirection direction) { 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run; 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t run_index = GetRunContainingCaret(selection); 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run_index >= runs_.size()) { 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is not in any run: we're at the visual and logical edge. 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectionModel edge = EdgeSelectionModel(direction); 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (edge.caret_pos() == selection.caret_pos()) 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return edge; 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int visual_index = (direction == CURSOR_RIGHT) ? 0 : runs_.size() - 1; 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[visual_to_logical_[visual_index]]; 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If the cursor is moving within the current run, just move it by one 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // grapheme in the appropriate direction. 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[run_index]; 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t caret = selection.caret_pos(); 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool forward_motion = 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis.fRTL == (direction == CURSOR_LEFT); 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (forward_motion) { 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (caret < LayoutIndexToTextIndex(run->range.end())) { 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) caret = IndexOfAdjacentGrapheme(caret, CURSOR_FORWARD); 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(caret, CURSOR_BACKWARD); 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (caret > LayoutIndexToTextIndex(run->range.start())) { 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) caret = IndexOfAdjacentGrapheme(caret, CURSOR_BACKWARD); 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(caret, CURSOR_FORWARD); 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is at the edge of a run; move to the visually adjacent run. 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int visual_index = logical_to_visual_[run_index]; 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_index += (direction == CURSOR_LEFT) ? -1 : 1; 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (visual_index < 0 || visual_index >= static_cast<int>(runs_.size())) 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EdgeSelectionModel(direction); 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[visual_to_logical_[visual_index]]; 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool forward_motion = run->script_analysis.fRTL == (direction == CURSOR_LEFT); 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return forward_motion ? FirstSelectionModelInsideRun(run) : 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LastSelectionModelInsideRun(run); 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(msw): Implement word breaking for Windows. 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::AdjacentWordSelectionModel( 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SelectionModel& selection, 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VisualCursorDirection direction) { 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (obscured()) 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EdgeSelectionModel(direction); 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD); 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool success = iter.Init(); 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(success); 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!success) 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return selection; 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t pos; 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (direction == CURSOR_RIGHT) { 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = std::min(selection.caret_pos() + 1, text().length()); 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (iter.Advance()) { 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = iter.pos(); 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (iter.IsWord() && pos > selection.caret_pos()) 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { // direction == CURSOR_LEFT 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Notes: We always iterate words from the beginning. 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is probably fast enough for our usage, but we may 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // want to modify WordIterator so that it can start from the 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // middle of string and advance backwards. 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = std::max<int>(selection.caret_pos() - 1, 0); 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (iter.Advance()) { 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (iter.IsWord()) { 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t begin = iter.pos() - iter.GetString().length(); 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (begin == selection.caret_pos()) { 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is at the beginning of a word. 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Move to previous word. 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (iter.pos() >= selection.caret_pos()) { 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is in the middle or at the end of a word. 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Move to the top of current word. 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = begin; 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = iter.pos() - iter.GetString().length(); 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(pos, CURSOR_FORWARD); 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::SetSelectionModel(const SelectionModel& model) { 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RenderText::SetSelectionModel(model); 3392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // TODO(xji|msw): The text selection color is applied in ItemizeLogicalText(). 3402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // So, the layout must be updated in order to draw the proper selection range. 3412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Colors should be applied in DrawVisualText(), as done by RenderTextLinux. 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ResetLayout(); 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 34590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)ui::Range RenderTextWin::GetGlyphBounds(size_t index) { 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_index = 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetRunContainingCaret(SelectionModel(index, CURSOR_FORWARD)); 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(run_index, runs_.size()); 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[run_index]; 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t layout_index = TextIndexToLayoutIndex(index); 35190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return ui::Range(GetGlyphXBoundary(run, layout_index, false), 35290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) GetGlyphXBoundary(run, layout_index, true)); 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::vector<Rect> RenderTextWin::GetSubstringBounds(const ui::Range& range) { 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(ui::Range(0, text().length()).Contains(range)); 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ui::Range layout_range(TextIndexToLayoutIndex(range.start()), 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TextIndexToLayoutIndex(range.end())); 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(ui::Range(0, GetLayoutText().length()).Contains(layout_range)); 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<Rect> bounds; 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (layout_range.is_empty()) 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return bounds; 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Add a Rect for each run/selection intersection. 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): The bounds should probably not always be leading the range ends. 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 36990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const internal::TextRun* run = runs_[visual_to_logical_[i]]; 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ui::Range intersection = run->range.Intersect(layout_range); 3715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (intersection.IsValid()) { 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!intersection.is_reversed()); 3735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ui::Range range_x(GetGlyphXBoundary(run, intersection.start(), false), 3745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetGlyphXBoundary(run, intersection.end(), false)); 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Rect rect(range_x.GetMin(), 0, range_x.length(), run->font.GetHeight()); 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rect.set_origin(ToViewPoint(rect.origin())); 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Union this with the last rect if they're adjacent. 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!bounds.empty() && rect.SharesEdgeWith(bounds.back())) { 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rect.Union(bounds.back()); 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bounds.pop_back(); 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bounds.push_back(rect); 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return bounds; 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::TextIndexToLayoutIndex(size_t index) const { 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!obscured()) 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return index; 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(index, text().length()); 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ptrdiff_t offset = ui::UTF16IndexToOffset(text(), 0, index); 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(offset, 0); 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(static_cast<size_t>(offset), GetLayoutText().length()); 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return static_cast<size_t>(offset); 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::LayoutIndexToTextIndex(size_t index) const { 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!obscured()) 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return index; 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(index, GetLayoutText().length()); 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t text_index = ui::UTF16OffsetToIndex(text(), 0, index); 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(text_index, text().length()); 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text_index; 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool RenderTextWin::IsCursorablePosition(size_t position) { 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (position == 0 || position == text().length()) 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4147d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Check if the index is at a valid code point (not mid-surrgate-pair) with 4157d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // distinct glyph bounds (not mid-multi-character-grapheme, eg. \x0915\x093f). 4167d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) return ui::IsValidCodePointIndex(text(), position) && 4177d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) GetGlyphBounds(position) != GetGlyphBounds(position - 1); 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::ResetLayout() { 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Layout is performed lazily as needed for drawing/metrics. 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_ = true; 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::EnsureLayout() { 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!needs_layout_) 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): Skip complex processing if ScriptIsComplex returns false. 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ItemizeLogicalText(); 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!runs_.empty()) 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutVisualText(); 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_ = false; 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::DrawVisualText(Canvas* canvas) { 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Skia will draw glyphs with respect to the baseline. 43990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Vector2d offset(GetTextOffset() + Vector2d(0, common_baseline_)); 4405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar x = SkIntToScalar(offset.x()); 4425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar y = SkIntToScalar(offset.y()); 4435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<SkPoint> pos; 4455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::SkiaTextRenderer renderer(canvas); 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ApplyFadeEffects(&renderer); 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ApplyTextShadows(&renderer); 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool smoothing_enabled; 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool cleartype_enabled; 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetCachedFontSmoothingSettings(&smoothing_enabled, &cleartype_enabled); 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Note that |cleartype_enabled| corresponds to Skia's |enable_lcd_text|. 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetFontSmoothingSettings( 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) smoothing_enabled, cleartype_enabled && !background_is_transparent()); 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Get the run specified by the visual-to-logical map. 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[visual_to_logical_[i]]; 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyph_count == 0) 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Based on WebCore::skiaDrawText. 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos.resize(run->glyph_count); 4665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar glyph_x = x; 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int glyph = 0; glyph < run->glyph_count; glyph++) { 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos[glyph].set(glyph_x + run->offsets[glyph].du, 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) y + run->offsets[glyph].dv); 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyph_x += SkIntToScalar(run->advance_widths[glyph]); 4715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetTextSize(run->font.GetFontSize()); 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetFontFamilyWithStyle(run->font.GetFontName(), run->font_style); 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetForegroundColor(run->foreground); 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.DrawPosText(&pos[0], run->glyphs.get(), run->glyph_count); 4772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) renderer.DrawDecorations(x, y, run->width, run->underline, run->strike, 4782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->diagonal_strike); 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) x = glyph_x; 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::ItemizeLogicalText() { 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) runs_.clear(); 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string_size_ = Size(0, GetFont().GetHeight()); 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) common_baseline_ = 0; 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Set Uniscribe's base text direction. 4905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_state_.uBidiLevel = 4915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (GetTextDirection() == base::i18n::RIGHT_TO_LEFT) ? 1 : 0; 4925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text().empty()) 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 4955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_OUTOFMEMORY; 4975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int script_items_count = 0; 4985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<SCRIPT_ITEM> script_items; 4992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const size_t text_length = GetLayoutText().length(); 5005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t n = kGuessItems; hr == E_OUTOFMEMORY && n < kMaxItems; n *= 2) { 5015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Derive the array of Uniscribe script items from the logical text. 5025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ScriptItemize always adds a terminal array item so that the length of the 5035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // last item can be derived from the terminal SCRIPT_ITEM::iCharPos. 5045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_items.resize(n); 5055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptItemize(GetLayoutText().c_str(), 5065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) text_length, 5075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) n - 1, 5085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &script_control_, 5095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &script_state_, 5105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &script_items[0], 5115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &script_items_count); 5125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 5145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (script_items_count <= 0) 5165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 5175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Temporarily apply composition underlines and selection colors. 5192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) ApplyCompositionAndSelectionStyles(); 5202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 5212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Build the list of runs from the script items and ranged colors/styles. 5222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // TODO(msw): Only break for bold/italic, not color etc. See TextRun comment. 5232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) internal::StyleIterator style(colors(), styles()); 5245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_ITEM* script_item = &script_items[0]; 5252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const size_t layout_text_length = GetLayoutText().length(); 5262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) for (size_t run_break = 0; run_break < layout_text_length;) { 5275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = new internal::TextRun(); 5285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.set_start(run_break); 5295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font = GetFont(); 5302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->font_style = (style.style(BOLD) ? Font::BOLD : 0) | 5312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (style.style(ITALIC) ? Font::ITALIC : 0); 5325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeriveFontIfNecessary(run->font.GetFontSize(), run->font.GetHeight(), 5335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font_style, &run->font); 5342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->foreground = style.color(); 5352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->strike = style.style(STRIKE); 5362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->diagonal_strike = style.style(DIAGONAL_STRIKE); 5372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->underline = style.style(UNDERLINE); 5385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis = script_item->a; 5395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Find the next break and advance the iterators as needed. 5412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const size_t script_item_break = (script_item + 1)->iCharPos; 5422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run_break = std::min(script_item_break, 5432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) TextIndexToLayoutIndex(style.GetRange().end())); 5442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) style.UpdatePosition(LayoutIndexToTextIndex(run_break)); 5452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (script_item_break == run_break) 5465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_item++; 5475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.set_end(run_break); 5485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) runs_.push_back(run); 5495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 5512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Undo the temporarily applied composition underlines and selection colors. 5522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) UndoCompositionAndSelectionStyles(); 5535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::LayoutVisualText() { 5565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!runs_.empty()); 5575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!cached_hdc_) 5595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cached_hdc_ = CreateCompatibleDC(NULL); 5605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_FAIL; 5625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string_size_.set_height(0); 5635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 5645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[i]; 5655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutTextRun(run); 5665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string_size_.set_height(std::max(string_size_.height(), 5685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font.GetHeight())); 5695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) common_baseline_ = std::max(common_baseline_, run->font.GetBaseline()); 5705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyph_count > 0) { 5725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.reset(new int[run->glyph_count]); 5735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->offsets.reset(new GOFFSET[run->glyph_count]); 5745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptPlace(cached_hdc_, 5755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_cache, 5765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs.get(), 5775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 5785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 5795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->script_analysis), 5805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 5815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->offsets.get(), 5825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->abc_widths)); 5835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 5845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Build the array of bidirectional embedding levels. 5882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) scoped_ptr<BYTE[]> levels(new BYTE[runs_.size()]); 5895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) 5905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) levels[i] = runs_[i]->script_analysis.s.uBidiLevel; 5915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Get the maps between visual and logical run indices. 5935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_to_logical_.reset(new int[runs_.size()]); 5945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) logical_to_visual_.reset(new int[runs_.size()]); 5955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptLayout(runs_.size(), 5965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) levels.get(), 5975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_to_logical_.get(), 5985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) logical_to_visual_.get()); 5995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 6005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Precalculate run width information. 6025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t preceding_run_widths = 0; 6035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 6045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[visual_to_logical_[i]]; 6055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->preceding_run_widths = preceding_run_widths; 6065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ABC& abc = run->abc_widths; 6075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->width = abc.abcA + abc.abcB + abc.abcC; 6085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) preceding_run_widths += run->width; 6095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string_size_.set_width(preceding_run_widths); 6115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::LayoutTextRun(internal::TextRun* run) { 6145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_length = run->range.length(); 6155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 6165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font original_font = run->font; 6175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LinkedFontsIterator fonts(original_font); 6185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool tried_cached_font = false; 6195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool tried_fallback = false; 6205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Keep track of the font that is able to display the greatest number of 6215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // characters for which ScriptShape() returned S_OK. This font will be used 6225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // in the case where no font is able to display the entire run. 6235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int best_partial_font_missing_char_count = INT_MAX; 6245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font best_partial_font = original_font; 6255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool using_best_partial_font = false; 6265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font current_font; 6275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.reset(new WORD[run_length]); 6295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (fonts.NextFont(¤t_font)) { 6305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ShapeTextRunWithFont(run, current_font); 6315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool glyphs_missing = false; 6335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (hr == USP_E_SCRIPT_NOT_IN_FONT) { 6345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyphs_missing = true; 6355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (hr == S_OK) { 6365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If |hr| is S_OK, there could still be missing glyphs in the output. 6375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // http://msdn.microsoft.com/en-us/library/windows/desktop/dd368564.aspx 6385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int missing_count = CountCharsWithMissingGlyphs(run); 6395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Track the font that produced the least missing glyphs. 6405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (missing_count < best_partial_font_missing_char_count) { 6415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) best_partial_font_missing_char_count = missing_count; 6425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) best_partial_font = run->font; 6435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyphs_missing = (missing_count != 0); 6455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 6465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << hr; 6475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use the font if it had glyphs for all characters. 6505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!glyphs_missing) { 6515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Save the successful fallback font that was chosen. 6525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (tried_fallback) 6535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) successful_substitute_fonts_[original_font.GetFontName()] = run->font; 6545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 6555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // First, try the cached font from previous runs, if any. 6585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!tried_cached_font) { 6595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tried_cached_font = true; 6605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::map<std::string, Font>::const_iterator it = 6625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) successful_substitute_fonts_.find(original_font.GetFontName()); 6635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (it != successful_substitute_fonts_.end()) { 6645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fonts.SetNextFont(it->second); 6655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 6665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If there are missing glyphs, first try finding a fallback font using a 6705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // meta file, if it hasn't yet been attempted for this run. 6715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw|asvitkine): Support RenderText's font_list()? 6725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!tried_fallback) { 6735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tried_fallback = true; 6745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font fallback_font; 6765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ChooseFallbackFont(cached_hdc_, run->font, run_text, run_length, 6775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &fallback_font)) { 6785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fonts.SetNextFont(fallback_font); 6795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 6805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If a font was able to partially display the run, use that now. 6855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (best_partial_font_missing_char_count < static_cast<int>(run_length)) { 6865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Re-shape the run only if |best_partial_font| differs from the last font. 6875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (best_partial_font.GetNativeFont() != run->font.GetNativeFont()) 6885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ShapeTextRunWithFont(run, best_partial_font); 6895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 6905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If no font was able to partially display the run, replace all glyphs 6935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // with |wgDefault| from the original font to ensure to they don't hold 6945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // garbage values. 6955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // First, clear the cache and select the original font on the HDC. 6965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&run->script_cache); 6975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font = original_font; 6985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(cached_hdc_, run->font.GetNativeFont()); 6995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Now, get the font's properties. 7015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_FONTPROPERTIES properties; 7025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&properties, 0, sizeof(properties)); 7035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) properties.cBytes = sizeof(properties); 7045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ScriptGetFontProperties(cached_hdc_, &run->script_cache, 7055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &properties); 7065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (hr == S_OK) { 7075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Finally, initialize |glyph_count|, |glyphs| and |visible_attributes| on 7085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the run (since they may not have been set yet). 7095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count = run_length; 7105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(run->visible_attributes.get(), 0, 7115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count * sizeof(SCRIPT_VISATTR)); 7125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int i = 0; i < run->glyph_count; ++i) { 7135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs[i] = IsWhitespace(run_text[i]) ? properties.wgBlank : 7145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) properties.wgDefault; 7155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): Don't use SCRIPT_UNDEFINED. Apparently Uniscribe can 7195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // crash on certain surrogate pairs with SCRIPT_UNDEFINED. 7205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // See https://bugzilla.mozilla.org/show_bug.cgi?id=341500 7215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // And http://maxradi.us/documents/uniscribe/ 7225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis.eScript = SCRIPT_UNDEFINED; 7235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HRESULT RenderTextWin::ShapeTextRunWithFont(internal::TextRun* run, 7265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Font& font) { 7275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the run's font only if necessary. If the two fonts wrap the same 7285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // PlatformFontWin object, their native fonts will have the same value. 7295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->font.GetNativeFont() != font.GetNativeFont()) { 7305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int font_size = run->font.GetFontSize(); 7315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int font_height = run->font.GetHeight(); 7325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font = font; 7335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeriveFontIfNecessary(font_size, font_height, run->font_style, &run->font); 7345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&run->script_cache); 7355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Select the font desired for glyph generation. 7385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(cached_hdc_, run->font.GetNativeFont()); 7395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_OUTOFMEMORY; 7415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_length = run->range.length(); 7425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 7435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Max glyph guess: http://msdn.microsoft.com/en-us/library/dd368564.aspx 7445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_glyphs = static_cast<size_t>(1.5 * run_length + 16); 7455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (hr == E_OUTOFMEMORY && max_glyphs < kMaxGlyphs) { 7465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count = 0; 7475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs.reset(new WORD[max_glyphs]); 7485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.reset(new SCRIPT_VISATTR[max_glyphs]); 7495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptShape(cached_hdc_, 7505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_cache, 7515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run_text, 7525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run_length, 7535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) max_glyphs, 7545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_analysis, 7555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs.get(), 7565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.get(), 7575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 7585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->glyph_count); 7595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) max_glyphs *= 2; 7605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return hr; 7625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int RenderTextWin::CountCharsWithMissingGlyphs(internal::TextRun* run) const { 7655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int chars_not_missing_glyphs = 0; 7665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_FONTPROPERTIES properties; 7675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&properties, 0, sizeof(properties)); 7685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) properties.cBytes = sizeof(properties); 7695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptGetFontProperties(cached_hdc_, &run->script_cache, &properties); 7705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 7725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t char_index = 0; char_index < run->range.length(); ++char_index) { 7735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int glyph_index = run->logical_clusters[char_index]; 7745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(glyph_index, 0); 7755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(glyph_index, run->glyph_count); 7765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyphs[glyph_index] == properties.wgDefault) 7785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 7795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Windows Vista sometimes returns glyphs equal to wgBlank (instead of 7815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // wgDefault), with fZeroWidth set. Treat such cases as having missing 7825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // glyphs if the corresponding character is not whitespace. 7835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // See: http://crbug.com/125629 7845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyphs[glyph_index] == properties.wgBlank && 7855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes[glyph_index].fZeroWidth && 7865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !IsWhitespace(run_text[char_index]) && 7875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !IsUnicodeBidiControlCharacter(run_text[char_index])) { 7885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 7895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++chars_not_missing_glyphs; 7925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(chars_not_missing_glyphs, static_cast<int>(run->range.length())); 7955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return run->range.length() - chars_not_missing_glyphs; 7965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::GetRunContainingCaret(const SelectionModel& caret) const { 7995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 8005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t layout_position = TextIndexToLayoutIndex(caret.caret_pos()); 8015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LogicalCursorDirection affinity = caret.caret_affinity(); 80290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) for (size_t run = 0; run < runs_.size(); ++run) 8035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (RangeContainsCaret(runs_[run]->range, layout_position, affinity)) 80490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return run; 80590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return runs_.size(); 8065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 80890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)size_t RenderTextWin::GetRunContainingXCoord(int x) const { 8095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 8105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Find the text run containing the argument point (assumed already offset). 81190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) for (size_t run = 0; run < runs_.size(); ++run) { 81290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if ((runs_[run]->preceding_run_widths <= x) && 81390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ((runs_[run]->preceding_run_widths + runs_[run]->width) > x)) 81490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return run; 81590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 81690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return runs_.size(); 8175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::FirstSelectionModelInsideRun( 8205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const internal::TextRun* run) { 8215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = LayoutIndexToTextIndex(run->range.start()); 8225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = IndexOfAdjacentGrapheme(position, CURSOR_FORWARD); 8235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(position, CURSOR_BACKWARD); 8245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::LastSelectionModelInsideRun( 8275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const internal::TextRun* run) { 8285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = LayoutIndexToTextIndex(run->range.end()); 8295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = IndexOfAdjacentGrapheme(position, CURSOR_BACKWARD); 8305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(position, CURSOR_FORWARD); 8315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderText* RenderText::CreateInstance() { 8345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return new RenderTextWin; 8355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace gfx 838