render_text_win.cc revision 58537e28ecd584eab876aee8be7156509866d23a
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" 1058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/i18n/char_iterator.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/i18n/rtl.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 137d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/strings/string_util.h" 14868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/utf_string_conversions.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/win/windows_version.h" 1658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "third_party/icu/source/common/unicode/uchar.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/base/text/utf16_indexing.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/canvas.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/font_fallback_win.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/font_smoothing_win.h" 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/gfx/platform_font_win.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace gfx { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 27eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// The maximum length of text supported for Uniscribe layout and display. 28eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// This empirically chosen value should prevent major performance degradations. 29eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// TODO(msw): Support longer text, partial layout/painting, etc. 30eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochconst size_t kMaxUniscribeTextLength = 10000; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 32eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// The initial guess and maximum supported number of runs; arbitrary values. 33eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// TODO(msw): Support more runs, determine a better initial guess, etc. 34eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochconst int kGuessRuns = 100; 35eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochconst size_t kMaxRuns = 10000; 36eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 37eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// The maximum number of glyphs per run; ScriptShape fails on larger values. 38eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochconst size_t kMaxGlyphs = 65535; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Callback to |EnumEnhMetaFile()| to intercept font creation. 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int CALLBACK MetaFileEnumProc(HDC hdc, 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HANDLETABLE* table, 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CONST ENHMETARECORD* record, 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int table_entries, 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LPARAM log_font) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (record->iType == EMR_EXTCREATEFONTINDIRECTW) { 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const EMREXTCREATEFONTINDIRECTW* create_font_record = 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const EMREXTCREATEFONTINDIRECTW*>(record); 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *reinterpret_cast<LOGFONT*>(log_font) = create_font_record->elfw.elfLogFont; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Finds a fallback font to use to render the specified |text| with respect to 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// an initial |font|. Returns the resulting font via out param |result|. Returns 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// |true| if a fallback font was found. 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Adapted from WebKit's |FontCache::GetFontDataForCharacters()|. 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(asvitkine): This should be moved to font_fallback_win.cc. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ChooseFallbackFont(HDC hdc, 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Font& font, 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* text, 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int text_length, 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font* result) { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use a meta file to intercept the fallback font chosen by Uniscribe. 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HDC meta_file_dc = CreateEnhMetaFile(hdc, NULL, NULL, NULL); 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!meta_file_dc) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(meta_file_dc, font.GetNativeFont()); 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_STRING_ANALYSIS script_analysis; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hresult = 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptStringAnalyse(meta_file_dc, text, text_length, 0, -1, 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SSA_METAFILE | SSA_FALLBACK | SSA_GLYPHS | SSA_LINK, 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 0, NULL, NULL, NULL, NULL, NULL, &script_analysis); 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (SUCCEEDED(hresult)) { 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hresult = ScriptStringOut(script_analysis, 0, 0, 0, NULL, 0, 0, FALSE); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptStringFree(&script_analysis); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool found_fallback = false; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HENHMETAFILE meta_file = CloseEnhMetaFile(meta_file_dc); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (SUCCEEDED(hresult)) { 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LOGFONT log_font; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) log_font.lfFaceName[0] = 0; 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnumEnhMetaFile(0, meta_file, MetaFileEnumProc, &log_font, NULL); 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (log_font.lfFaceName[0]) { 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *result = Font(UTF16ToUTF8(log_font.lfFaceName), font.GetFontSize()); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) found_fallback = true; 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeleteEnhMetaFile(meta_file); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return found_fallback; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Changes |font| to have the specified |font_size| (or |font_height| on Windows 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// XP) and |font_style| if it is not the case already. Only considers bold and 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// italic styles, since the underlined style has no effect on glyph shaping. 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void DeriveFontIfNecessary(int font_size, 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int font_height, 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int font_style, 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font* font) { 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int kStyleMask = (Font::BOLD | Font::ITALIC); 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int target_style = (font_style & kStyleMask); 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // On Windows XP, the font must be resized using |font_height| instead of 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |font_size| to match GDI behavior. 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (base::win::GetVersion() < base::win::VERSION_VISTA) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PlatformFontWin* platform_font = 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<PlatformFontWin*>(font->platform_font()); 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *font = platform_font->DeriveFontWithHeight(font_height, target_style); 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int current_style = (font->GetStyle() & kStyleMask); 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int current_size = font->GetFontSize(); 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (current_style != target_style || current_size != font_size) 1202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) *font = font->DeriveFont(font_size - current_size, target_style); 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Returns true if |c| is a Unicode BiDi control character. 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool IsUnicodeBidiControlCharacter(char16 c) { 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return c == base::i18n::kRightToLeftMark || 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightMark || 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightEmbeddingMark || 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kRightToLeftEmbeddingMark || 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kPopDirectionalFormatting || 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kLeftToRightOverride || 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) c == base::i18n::kRightToLeftOverride; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 134558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch// Returns the corresponding glyph range of the given character range. 135558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch// |range| is in text-space (0 corresponds to |GetLayoutText()[0]|). 136558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch// Returned value is in run-space (0 corresponds to the first glyph in the run). 13758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)gfx::Range CharRangeToGlyphRange(const internal::TextRun& run, 13858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const gfx::Range& range) { 139558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch DCHECK(run.range.Contains(range)); 140558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch DCHECK(!range.is_reversed()); 141558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch DCHECK(!range.is_empty()); 14258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const gfx::Range run_range = gfx::Range(range.start() - run.range.start(), 143558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch range.end() - run.range.start()); 14458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) gfx::Range result; 145558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch if (run.script_analysis.fRTL) { 14658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) result = gfx::Range(run.logical_clusters[run_range.end() - 1], 147558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run_range.start() > 0 ? run.logical_clusters[run_range.start() - 1] 148558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch : run.glyph_count); 149558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch } else { 15058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) result = gfx::Range(run.logical_clusters[run_range.start()], 151558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run_range.end() < run.range.length() ? 152558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run.logical_clusters[run_range.end()] : run.glyph_count); 153558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch } 154558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch DCHECK(!result.is_reversed()); 15558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK(gfx::Range(0, run.glyph_count).Contains(result)); 156558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch return result; 157558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch} 158558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace internal { 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextRun::TextRun() 164558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch : font_style(0), 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) strike(false), 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) diagonal_strike(false), 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) underline(false), 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) width(0), 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) preceding_run_widths(0), 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyph_count(0), 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_cache(NULL) { 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_analysis, 0, sizeof(script_analysis)); 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&abc_widths, 0, sizeof(abc_widths)); 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)TextRun::~TextRun() { 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&script_cache); 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Returns the X coordinate of the leading or |trailing| edge of the glyph 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// starting at |index|, relative to the left of the text (not the view). 18290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)int GetGlyphXBoundary(const internal::TextRun* run, 18390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) size_t index, 18490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) bool trailing) { 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(index, run->range.start()); 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(index, run->range.end() + (trailing ? 0 : 1)); 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int x = 0; 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ScriptCPtoX( 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) index - run->range.start(), 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) trailing, 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.length(), 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.get(), 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_analysis, 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &x); 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return run->preceding_run_widths + x; 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace internal 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HDC RenderTextWin::cached_hdc_ = NULL; 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::map<std::string, Font> RenderTextWin::successful_substitute_fonts_; 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderTextWin::RenderTextWin() 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : RenderText(), 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) common_baseline_(0), 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_(false) { 214eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch set_truncate_length(kMaxUniscribeTextLength); 215eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_control_, 0, sizeof(script_control_)); 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&script_state_, 0, sizeof(script_state_)); 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MoveCursorTo(EdgeSelectionModel(CURSOR_LEFT)); 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderTextWin::~RenderTextWin() { 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)Size RenderTextWin::GetStringSize() { 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return string_size_; 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int RenderTextWin::GetBaseline() { 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return common_baseline_; 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::FindCursorPosition(const Point& point) { 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (text().empty()) 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(); 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Find the run that contains the point and adjust the argument location. 24190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int x = ToTextPoint(point).x(); 24290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) size_t run_index = GetRunContainingXCoord(x); 243eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (run_index >= runs_.size()) 24490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return EdgeSelectionModel((x < 0) ? CURSOR_LEFT : CURSOR_RIGHT); 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[run_index]; 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int position = 0, trailing = 0; 24890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) HRESULT hr = ScriptXtoCP(x - run->preceding_run_widths, 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.length(), 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.get(), 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->script_analysis), 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &position, 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &trailing); 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(trailing, 0); 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position += run->range.start(); 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t cursor = LayoutIndexToTextIndex(position + trailing); 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(cursor, text().length()); 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(cursor, trailing ? CURSOR_BACKWARD : CURSOR_FORWARD); 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::vector<RenderText::FontSpan> RenderTextWin::GetFontSpansForTesting() { 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<RenderText::FontSpan> spans; 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) spans.push_back(RenderText::FontSpan(runs_[i]->font, 27158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) gfx::Range(LayoutIndexToTextIndex(runs_[i]->range.start()), 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutIndexToTextIndex(runs_[i]->range.end())))); 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return spans; 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::AdjacentCharSelectionModel( 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SelectionModel& selection, 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VisualCursorDirection direction) { 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run; 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t run_index = GetRunContainingCaret(selection); 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run_index >= runs_.size()) { 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is not in any run: we're at the visual and logical edge. 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectionModel edge = EdgeSelectionModel(direction); 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (edge.caret_pos() == selection.caret_pos()) 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return edge; 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int visual_index = (direction == CURSOR_RIGHT) ? 0 : runs_.size() - 1; 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[visual_to_logical_[visual_index]]; 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If the cursor is moving within the current run, just move it by one 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // grapheme in the appropriate direction. 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[run_index]; 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t caret = selection.caret_pos(); 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool forward_motion = 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis.fRTL == (direction == CURSOR_LEFT); 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (forward_motion) { 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (caret < LayoutIndexToTextIndex(run->range.end())) { 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) caret = IndexOfAdjacentGrapheme(caret, CURSOR_FORWARD); 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(caret, CURSOR_BACKWARD); 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (caret > LayoutIndexToTextIndex(run->range.start())) { 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) caret = IndexOfAdjacentGrapheme(caret, CURSOR_BACKWARD); 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(caret, CURSOR_FORWARD); 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is at the edge of a run; move to the visually adjacent run. 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int visual_index = logical_to_visual_[run_index]; 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_index += (direction == CURSOR_LEFT) ? -1 : 1; 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (visual_index < 0 || visual_index >= static_cast<int>(runs_.size())) 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EdgeSelectionModel(direction); 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run = runs_[visual_to_logical_[visual_index]]; 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool forward_motion = run->script_analysis.fRTL == (direction == CURSOR_LEFT); 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return forward_motion ? FirstSelectionModelInsideRun(run) : 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LastSelectionModelInsideRun(run); 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(msw): Implement word breaking for Windows. 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::AdjacentWordSelectionModel( 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SelectionModel& selection, 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VisualCursorDirection direction) { 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (obscured()) 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EdgeSelectionModel(direction); 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::i18n::BreakIterator iter(text(), base::i18n::BreakIterator::BREAK_WORD); 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool success = iter.Init(); 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(success); 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!success) 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return selection; 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t pos; 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (direction == CURSOR_RIGHT) { 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = std::min(selection.caret_pos() + 1, text().length()); 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (iter.Advance()) { 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = iter.pos(); 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (iter.IsWord() && pos > selection.caret_pos()) 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { // direction == CURSOR_LEFT 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Notes: We always iterate words from the beginning. 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is probably fast enough for our usage, but we may 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // want to modify WordIterator so that it can start from the 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // middle of string and advance backwards. 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = std::max<int>(selection.caret_pos() - 1, 0); 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (iter.Advance()) { 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (iter.IsWord()) { 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t begin = iter.pos() - iter.GetString().length(); 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (begin == selection.caret_pos()) { 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is at the beginning of a word. 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Move to previous word. 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (iter.pos() >= selection.caret_pos()) { 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The cursor is in the middle or at the end of a word. 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Move to the top of current word. 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = begin; 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos = iter.pos() - iter.GetString().length(); 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(pos, CURSOR_FORWARD); 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 36958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)gfx::Range RenderTextWin::GetGlyphBounds(size_t index) { 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_index = 3715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetRunContainingCaret(SelectionModel(index, CURSOR_FORWARD)); 372eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Return edge bounds if the index is invalid or beyond the layout text size. 373eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (run_index >= runs_.size()) 37458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return gfx::Range(string_size_.width()); 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[run_index]; 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t layout_index = TextIndexToLayoutIndex(index); 37758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return gfx::Range(GetGlyphXBoundary(run, layout_index, false), 37890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) GetGlyphXBoundary(run, layout_index, true)); 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 38158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)std::vector<Rect> RenderTextWin::GetSubstringBounds(const gfx::Range& range) { 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 38358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK(gfx::Range(0, text().length()).Contains(range)); 38458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) gfx::Range layout_range(TextIndexToLayoutIndex(range.start()), 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TextIndexToLayoutIndex(range.end())); 38658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK(gfx::Range(0, GetLayoutText().length()).Contains(layout_range)); 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<Rect> bounds; 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (layout_range.is_empty()) 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return bounds; 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Add a Rect for each run/selection intersection. 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): The bounds should probably not always be leading the range ends. 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 39590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const internal::TextRun* run = runs_[visual_to_logical_[i]]; 39658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) gfx::Range intersection = run->range.Intersect(layout_range); 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (intersection.IsValid()) { 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!intersection.is_reversed()); 39958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) gfx::Range range_x(GetGlyphXBoundary(run, intersection.start(), false), 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetGlyphXBoundary(run, intersection.end(), false)); 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Rect rect(range_x.GetMin(), 0, range_x.length(), run->font.GetHeight()); 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rect.set_origin(ToViewPoint(rect.origin())); 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Union this with the last rect if they're adjacent. 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!bounds.empty() && rect.SharesEdgeWith(bounds.back())) { 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) rect.Union(bounds.back()); 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bounds.pop_back(); 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bounds.push_back(rect); 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return bounds; 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::TextIndexToLayoutIndex(size_t index) const { 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(index, text().length()); 416eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch ptrdiff_t i = obscured() ? ui::UTF16IndexToOffset(text(), 0, index) : index; 417eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch CHECK_GE(i, 0); 418eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Clamp layout indices to the length of the text actually used for layout. 419eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch return std::min<size_t>(GetLayoutText().length(), i); 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::LayoutIndexToTextIndex(size_t index) const { 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!obscured()) 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return index; 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(index, GetLayoutText().length()); 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t text_index = ui::UTF16OffsetToIndex(text(), 0, index); 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(text_index, text().length()); 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return text_index; 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool RenderTextWin::IsCursorablePosition(size_t position) { 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (position == 0 || position == text().length()) 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnsureLayout(); 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 437558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // Check that the index is at a valid code point (not mid-surrgate-pair), 438558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // that it is not truncated from layout text (its glyph is shown on screen), 439558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // and that its glyph has distinct bounds (not mid-multi-character-grapheme). 440558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // An example of a multi-character-grapheme that is not a surrogate-pair is: 441558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // \x0915\x093f - (ki) - one of many Devanagari biconsonantal conjuncts. 4427d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) return ui::IsValidCodePointIndex(text(), position) && 443558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch position < LayoutIndexToTextIndex(GetLayoutText().length()) && 4447d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) GetGlyphBounds(position) != GetGlyphBounds(position - 1); 4455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::ResetLayout() { 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Layout is performed lazily as needed for drawing/metrics. 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_ = true; 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::EnsureLayout() { 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!needs_layout_) 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): Skip complex processing if ScriptIsComplex returns false. 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ItemizeLogicalText(); 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!runs_.empty()) 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutVisualText(); 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) needs_layout_ = false; 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::DrawVisualText(Canvas* canvas) { 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Skia will draw glyphs with respect to the baseline. 46690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Vector2d offset(GetTextOffset() + Vector2d(0, common_baseline_)); 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar x = SkIntToScalar(offset.x()); 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar y = SkIntToScalar(offset.y()); 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<SkPoint> pos; 4725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::SkiaTextRenderer renderer(canvas); 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ApplyFadeEffects(&renderer); 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ApplyTextShadows(&renderer); 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool smoothing_enabled; 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool cleartype_enabled; 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GetCachedFontSmoothingSettings(&smoothing_enabled, &cleartype_enabled); 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Note that |cleartype_enabled| corresponds to Skia's |enable_lcd_text|. 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetFontSmoothingSettings( 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) smoothing_enabled, cleartype_enabled && !background_is_transparent()); 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 484558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch ApplyCompositionAndSelectionStyles(); 485558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Get the run specified by the visual-to-logical map. 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[visual_to_logical_[i]]; 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 490a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch // Skip painting empty runs and runs outside the display rect area. 491a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch if ((run->glyph_count == 0) || (x >= display_rect().right()) || 492a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch (x + run->width <= display_rect().x())) { 493a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch x += run->width; 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 495a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch } 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 497558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // Based on WebCore::skiaDrawText. |pos| contains the positions of glyphs. 498558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // An extra terminal |pos| entry is added to simplify width calculations. 499558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch pos.resize(run->glyph_count + 1); 5005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SkScalar glyph_x = x; 5015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int glyph = 0; glyph < run->glyph_count; glyph++) { 5025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pos[glyph].set(glyph_x + run->offsets[glyph].du, 5035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) y + run->offsets[glyph].dv); 5045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyph_x += SkIntToScalar(run->advance_widths[glyph]); 5055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 506558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch pos.back().set(glyph_x, y); 5075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetTextSize(run->font.GetFontSize()); 5095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) renderer.SetFontFamilyWithStyle(run->font.GetFontName(), run->font_style); 510558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 511558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch for (BreakList<SkColor>::const_iterator it = 512558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch colors().GetBreak(run->range.start()); 513558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch it != colors().breaks().end() && it->first < run->range.end(); 514558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch ++it) { 51558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const gfx::Range glyph_range = CharRangeToGlyphRange(*run, 516558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch colors().GetRange(it).Intersect(run->range)); 517a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (glyph_range.is_empty()) 518a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) continue; 519558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch renderer.SetForegroundColor(it->second); 520558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch renderer.DrawPosText(&pos[glyph_range.start()], 521558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch &run->glyphs[glyph_range.start()], 522558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch glyph_range.length()); 523558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch const SkScalar width = pos[glyph_range.end()].x() - 524558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch pos[glyph_range.start()].x(); 525558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch renderer.DrawDecorations(pos[glyph_range.start()].x(), y, 526558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch SkScalarCeilToInt(width), run->underline, 527558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run->strike, run->diagonal_strike); 528558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch } 5295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 530a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch DCHECK_EQ(glyph_x - x, run->width); 5315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) x = glyph_x; 5325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 533558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 534558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch UndoCompositionAndSelectionStyles(); 5355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::ItemizeLogicalText() { 5385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) runs_.clear(); 539a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Make |string_size_|'s height and |common_baseline_| tall enough to draw 540a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // often-used characters which are rendered with fonts in the font list. 541bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch string_size_ = Size(0, font_list().GetHeight()); 542bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch common_baseline_ = font_list().GetBaseline(); 5435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Set Uniscribe's base text direction. 5455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_state_.uBidiLevel = 5465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (GetTextDirection() == base::i18n::RIGHT_TO_LEFT) ? 1 : 0; 5475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 54858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const base::string16& layout_text = GetLayoutText(); 54958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (layout_text.empty()) 5505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 5515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_OUTOFMEMORY; 5535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int script_items_count = 0; 5545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<SCRIPT_ITEM> script_items; 55558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const size_t layout_text_length = layout_text.length(); 556eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Ensure that |kMaxRuns| is attempted and the loop terminates afterward. 557eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch for (size_t runs = kGuessRuns; hr == E_OUTOFMEMORY && runs <= kMaxRuns; 558eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch runs = std::max(runs + 1, std::min(runs * 2, kMaxRuns))) { 5595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Derive the array of Uniscribe script items from the logical text. 560eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // ScriptItemize always adds a terminal array item so that the length of 561eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // the last item can be derived from the terminal SCRIPT_ITEM::iCharPos. 562eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch script_items.resize(runs); 56358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) hr = ScriptItemize(layout_text.c_str(), layout_text_length, runs - 1, 56458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) &script_control_, &script_state_, &script_items[0], 56558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) &script_items_count); 5665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 568eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (!SUCCEEDED(hr) || script_items_count <= 0) 5695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 5705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Temporarily apply composition underlines and selection colors. 5722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) ApplyCompositionAndSelectionStyles(); 5732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 574558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // Build the list of runs from the script items and ranged styles. Use an 575558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // empty color BreakList to avoid breaking runs at color boundaries. 576558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch BreakList<SkColor> empty_colors; 57758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) empty_colors.SetMax(layout_text_length); 578558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch internal::StyleIterator style(empty_colors, styles()); 5795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_ITEM* script_item = &script_items[0]; 580eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const size_t max_run_length = kMaxGlyphs / 2; 5812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) for (size_t run_break = 0; run_break < layout_text_length;) { 5825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = new internal::TextRun(); 5835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.set_start(run_break); 584a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) run->font = GetPrimaryFont(); 5852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->font_style = (style.style(BOLD) ? Font::BOLD : 0) | 5862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (style.style(ITALIC) ? Font::ITALIC : 0); 5875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeriveFontIfNecessary(run->font.GetFontSize(), run->font.GetHeight(), 5885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font_style, &run->font); 5892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->strike = style.style(STRIKE); 5902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->diagonal_strike = style.style(DIAGONAL_STRIKE); 5912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run->underline = style.style(UNDERLINE); 5925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis = script_item->a; 5935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Find the next break and advance the iterators as needed. 5952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const size_t script_item_break = (script_item + 1)->iCharPos; 5962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) run_break = std::min(script_item_break, 5972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) TextIndexToLayoutIndex(style.GetRange().end())); 59858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 599eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Clamp run lengths to avoid exceeding the maximum supported glyph count. 60058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if ((run_break - run->range.start()) > max_run_length) { 601eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch run_break = run->range.start() + max_run_length; 60258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!ui::IsValidCodePointIndex(layout_text, run_break)) 60358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) --run_break; 60458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 60558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 60658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Break runs between characters in different code blocks. This avoids using 60758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // fallback fonts for more characters than needed. http://crbug.com/278913 60858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (run_break > run->range.start()) { 60958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const size_t run_start = run->range.start(); 61058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const int32 run_length = static_cast<int32>(run_break - run_start); 61158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) base::i18n::UTF16CharIterator iter(layout_text.c_str() + run_start, 61258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) run_length); 61358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const UBlockCode first_block_code = ublock_getCode(iter.get()); 61458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) while (iter.Advance() && iter.array_pos() < run_length) { 61558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (ublock_getCode(iter.get()) != first_block_code) { 61658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) run_break = run_start + iter.array_pos(); 61758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) break; 61858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 61958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 62058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 62158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 62258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK(ui::IsValidCodePointIndex(layout_text, run_break)); 62358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 6242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) style.UpdatePosition(LayoutIndexToTextIndex(run_break)); 6252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (script_item_break == run_break) 6265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) script_item++; 6275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->range.set_end(run_break); 6285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) runs_.push_back(run); 6295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 6312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Undo the temporarily applied composition underlines and selection colors. 6322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) UndoCompositionAndSelectionStyles(); 6335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::LayoutVisualText() { 6365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!runs_.empty()); 6375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!cached_hdc_) 6395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cached_hdc_ = CreateCompatibleDC(NULL); 6405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_FAIL; 642a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Ensure ascent and descent are not smaller than ones of the font list. 643a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Keep them tall enough to draw often-used characters. 644a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // For example, if a text field contains a Japanese character, which is 645a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // smaller than Latin ones, and then later a Latin one is inserted, this 646a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // ensures that the text baseline does not shift. 647bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch int ascent = font_list().GetBaseline(); 648bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch int descent = font_list().GetHeight() - font_list().GetBaseline(); 6495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 6505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[i]; 6515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LayoutTextRun(run); 6525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 653bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch ascent = std::max(ascent, run->font.GetBaseline()); 654bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch descent = std::max(descent, 655bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch run->font.GetHeight() - run->font.GetBaseline()); 6565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyph_count > 0) { 6585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.reset(new int[run->glyph_count]); 6595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->offsets.reset(new GOFFSET[run->glyph_count]); 6605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptPlace(cached_hdc_, 6615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->script_cache, 6625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs.get(), 6635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count, 6645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.get(), 6655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->script_analysis), 6665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->advance_widths.get(), 6675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->offsets.get(), 6685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &(run->abc_widths)); 6695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 6705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 672bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch string_size_.set_height(ascent + descent); 673bbcdd45c55eb7c4641ab97aef9889b0fc828e7d3Ben Murdoch common_baseline_ = ascent; 6745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Build the array of bidirectional embedding levels. 6762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) scoped_ptr<BYTE[]> levels(new BYTE[runs_.size()]); 6775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) 6785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) levels[i] = runs_[i]->script_analysis.s.uBidiLevel; 6795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Get the maps between visual and logical run indices. 6815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_to_logical_.reset(new int[runs_.size()]); 6825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) logical_to_visual_.reset(new int[runs_.size()]); 6835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hr = ScriptLayout(runs_.size(), 6845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) levels.get(), 6855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) visual_to_logical_.get(), 6865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) logical_to_visual_.get()); 6875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(SUCCEEDED(hr)); 6885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Precalculate run width information. 6905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t preceding_run_widths = 0; 6915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < runs_.size(); ++i) { 6925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) internal::TextRun* run = runs_[visual_to_logical_[i]]; 6935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->preceding_run_widths = preceding_run_widths; 6945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ABC& abc = run->abc_widths; 6955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->width = abc.abcA + abc.abcB + abc.abcC; 6965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) preceding_run_widths += run->width; 6975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) string_size_.set_width(preceding_run_widths); 6995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void RenderTextWin::LayoutTextRun(internal::TextRun* run) { 7025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_length = run->range.length(); 7035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 7045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font original_font = run->font; 7055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LinkedFontsIterator fonts(original_font); 7065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool tried_cached_font = false; 7075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool tried_fallback = false; 7085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Keep track of the font that is able to display the greatest number of 7095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // characters for which ScriptShape() returned S_OK. This font will be used 7105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // in the case where no font is able to display the entire run. 7115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int best_partial_font_missing_char_count = INT_MAX; 7125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font best_partial_font = original_font; 7135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font current_font; 7145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->logical_clusters.reset(new WORD[run_length]); 7165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (fonts.NextFont(¤t_font)) { 7175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ShapeTextRunWithFont(run, current_font); 7185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool glyphs_missing = false; 7205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (hr == USP_E_SCRIPT_NOT_IN_FONT) { 7215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyphs_missing = true; 7225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (hr == S_OK) { 7235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If |hr| is S_OK, there could still be missing glyphs in the output. 7245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // http://msdn.microsoft.com/en-us/library/windows/desktop/dd368564.aspx 7255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int missing_count = CountCharsWithMissingGlyphs(run); 7265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Track the font that produced the least missing glyphs. 7275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (missing_count < best_partial_font_missing_char_count) { 7285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) best_partial_font_missing_char_count = missing_count; 7295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) best_partial_font = run->font; 7305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyphs_missing = (missing_count != 0); 7325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 7335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << hr; 7345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use the font if it had glyphs for all characters. 7375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!glyphs_missing) { 7385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Save the successful fallback font that was chosen. 7395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (tried_fallback) 7405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) successful_substitute_fonts_[original_font.GetFontName()] = run->font; 7415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 7425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // First, try the cached font from previous runs, if any. 7455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!tried_cached_font) { 7465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tried_cached_font = true; 7475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::map<std::string, Font>::const_iterator it = 7495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) successful_substitute_fonts_.find(original_font.GetFontName()); 7505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (it != successful_substitute_fonts_.end()) { 7515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fonts.SetNextFont(it->second); 7525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 7535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If there are missing glyphs, first try finding a fallback font using a 7575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // meta file, if it hasn't yet been attempted for this run. 7585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw|asvitkine): Support RenderText's font_list()? 7595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!tried_fallback) { 7605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) tried_fallback = true; 7615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Font fallback_font; 7635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ChooseFallbackFont(cached_hdc_, run->font, run_text, run_length, 7645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &fallback_font)) { 7655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fonts.SetNextFont(fallback_font); 7665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 7675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If a font was able to partially display the run, use that now. 7725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (best_partial_font_missing_char_count < static_cast<int>(run_length)) { 7735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Re-shape the run only if |best_partial_font| differs from the last font. 7745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (best_partial_font.GetNativeFont() != run->font.GetNativeFont()) 7755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ShapeTextRunWithFont(run, best_partial_font); 7765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 7775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If no font was able to partially display the run, replace all glyphs 7805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // with |wgDefault| from the original font to ensure to they don't hold 7815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // garbage values. 7825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // First, clear the cache and select the original font on the HDC. 7835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&run->script_cache); 7845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font = original_font; 7855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(cached_hdc_, run->font.GetNativeFont()); 7865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Now, get the font's properties. 7885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_FONTPROPERTIES properties; 7895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&properties, 0, sizeof(properties)); 7905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) properties.cBytes = sizeof(properties); 7915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = ScriptGetFontProperties(cached_hdc_, &run->script_cache, 7925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &properties); 793558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 794558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // The initial values for the "missing" glyph and the space glyph are taken 795558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // from the recommendations section of the OpenType spec: 796558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // https://www.microsoft.com/typography/otspec/recom.htm 797558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch WORD missing_glyph = 0; 798558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch WORD space_glyph = 3; 7995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (hr == S_OK) { 800558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch missing_glyph = properties.wgDefault; 801558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch space_glyph = properties.wgBlank; 802558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch } 803558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch 804558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // Finally, initialize |glyph_count|, |glyphs|, |visible_attributes| and 805558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch // |logical_clusters| on the run (since they may not have been set yet). 806558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run->glyph_count = run_length; 807558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch memset(run->visible_attributes.get(), 0, 808558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run->glyph_count * sizeof(SCRIPT_VISATTR)); 809558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch for (int i = 0; i < run->glyph_count; ++i) 810558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run->glyphs[i] = IsWhitespace(run_text[i]) ? space_glyph : missing_glyph; 811558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch for (size_t i = 0; i < run_length; ++i) { 812558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run->logical_clusters[i] = run->script_analysis.fRTL ? 813558790d6acca3451cf3a6b497803a5f07d0bec58Ben Murdoch run_length - 1 - i : i; 8145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(msw): Don't use SCRIPT_UNDEFINED. Apparently Uniscribe can 8175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // crash on certain surrogate pairs with SCRIPT_UNDEFINED. 8185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // See https://bugzilla.mozilla.org/show_bug.cgi?id=341500 8195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // And http://maxradi.us/documents/uniscribe/ 8205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->script_analysis.eScript = SCRIPT_UNDEFINED; 8215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)HRESULT RenderTextWin::ShapeTextRunWithFont(internal::TextRun* run, 8245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const Font& font) { 8255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update the run's font only if necessary. If the two fonts wrap the same 8265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // PlatformFontWin object, their native fonts will have the same value. 8275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->font.GetNativeFont() != font.GetNativeFont()) { 8285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int font_size = run->font.GetFontSize(); 8295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int font_height = run->font.GetHeight(); 8305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->font = font; 8315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DeriveFontIfNecessary(font_size, font_height, run->font_style, &run->font); 8325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptFreeCache(&run->script_cache); 8335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Select the font desired for glyph generation. 8365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SelectObject(cached_hdc_, run->font.GetNativeFont()); 8375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HRESULT hr = E_OUTOFMEMORY; 8395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t run_length = run->range.length(); 8405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 841eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Guess the expected number of glyphs from the length of the run. 842eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // MSDN suggests this at http://msdn.microsoft.com/en-us/library/dd368564.aspx 8435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_glyphs = static_cast<size_t>(1.5 * run_length + 16); 844eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch while (hr == E_OUTOFMEMORY && max_glyphs <= kMaxGlyphs) { 8455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyph_count = 0; 8465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->glyphs.reset(new WORD[max_glyphs]); 8475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes.reset(new SCRIPT_VISATTR[max_glyphs]); 848eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch hr = ScriptShape(cached_hdc_, &run->script_cache, run_text, run_length, 849eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch max_glyphs, &run->script_analysis, run->glyphs.get(), 850eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch run->logical_clusters.get(), run->visible_attributes.get(), 8515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &run->glyph_count); 852eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Ensure that |kMaxGlyphs| is attempted and the loop terminates afterward. 853eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch max_glyphs = std::max(max_glyphs + 1, std::min(max_glyphs * 2, kMaxGlyphs)); 8545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return hr; 8565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int RenderTextWin::CountCharsWithMissingGlyphs(internal::TextRun* run) const { 8595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int chars_not_missing_glyphs = 0; 8605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SCRIPT_FONTPROPERTIES properties; 8615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(&properties, 0, sizeof(properties)); 8625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) properties.cBytes = sizeof(properties); 8635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ScriptGetFontProperties(cached_hdc_, &run->script_cache, &properties); 8645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const wchar_t* run_text = &(GetLayoutText()[run->range.start()]); 8665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t char_index = 0; char_index < run->range.length(); ++char_index) { 8675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int glyph_index = run->logical_clusters[char_index]; 8685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(glyph_index, 0); 8695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LT(glyph_index, run->glyph_count); 8705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyphs[glyph_index] == properties.wgDefault) 8725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 8735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Windows Vista sometimes returns glyphs equal to wgBlank (instead of 8755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // wgDefault), with fZeroWidth set. Treat such cases as having missing 8765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // glyphs if the corresponding character is not whitespace. 8775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // See: http://crbug.com/125629 8785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (run->glyphs[glyph_index] == properties.wgBlank && 8795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) run->visible_attributes[glyph_index].fZeroWidth && 8805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !IsWhitespace(run_text[char_index]) && 8815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !IsUnicodeBidiControlCharacter(run_text[char_index])) { 8825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) continue; 8835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++chars_not_missing_glyphs; 8865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(chars_not_missing_glyphs, static_cast<int>(run->range.length())); 8895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return run->range.length() - chars_not_missing_glyphs; 8905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)size_t RenderTextWin::GetRunContainingCaret(const SelectionModel& caret) const { 8935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 8945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t layout_position = TextIndexToLayoutIndex(caret.caret_pos()); 8955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LogicalCursorDirection affinity = caret.caret_affinity(); 89690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) for (size_t run = 0; run < runs_.size(); ++run) 8975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (RangeContainsCaret(runs_[run]->range, layout_position, affinity)) 89890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return run; 89990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return runs_.size(); 9005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 90290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)size_t RenderTextWin::GetRunContainingXCoord(int x) const { 9035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!needs_layout_); 9045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Find the text run containing the argument point (assumed already offset). 90590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) for (size_t run = 0; run < runs_.size(); ++run) { 90690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if ((runs_[run]->preceding_run_widths <= x) && 90790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ((runs_[run]->preceding_run_widths + runs_[run]->width) > x)) 90890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return run; 90990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 91090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return runs_.size(); 9115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::FirstSelectionModelInsideRun( 9145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const internal::TextRun* run) { 9155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = LayoutIndexToTextIndex(run->range.start()); 9165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = IndexOfAdjacentGrapheme(position, CURSOR_FORWARD); 9175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(position, CURSOR_BACKWARD); 9185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SelectionModel RenderTextWin::LastSelectionModelInsideRun( 9215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const internal::TextRun* run) { 9225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t position = LayoutIndexToTextIndex(run->range.end()); 9235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) position = IndexOfAdjacentGrapheme(position, CURSOR_BACKWARD); 9245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SelectionModel(position, CURSOR_FORWARD); 9255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)RenderText* RenderText::CreateInstance() { 9285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return new RenderTextWin; 9295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 9305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace gfx 932