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1 /* | 1 /* |
2 * Copyright (c) 2012 Google Inc. All rights reserved. | 2 * Copyright (c) 2012 Google Inc. All rights reserved. |
3 * Copyright (C) 2013 BlackBerry Limited. All rights reserved. | 3 * Copyright (C) 2013 BlackBerry Limited. All rights reserved. |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions are | 6 * modification, are permitted provided that the following conditions are |
7 * met: | 7 * met: |
8 * | 8 * |
9 * * Redistributions of source code must retain the above copyright | 9 * * Redistributions of source code must retain the above copyright |
10 * notice, this list of conditions and the following disclaimer. | 10 * notice, this list of conditions and the following disclaimer. |
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450 { | 450 { |
451 ASSERT_WITH_SECURITY_IMPLICATION(from >= 0); | 451 ASSERT_WITH_SECURITY_IMPLICATION(from >= 0); |
452 ASSERT_WITH_SECURITY_IMPLICATION(to <= m_run.length()); | 452 ASSERT_WITH_SECURITY_IMPLICATION(to <= m_run.length()); |
453 m_fromIndex = from; | 453 m_fromIndex = from; |
454 m_toIndex = to; | 454 m_toIndex = to; |
455 } | 455 } |
456 | 456 |
457 void HarfBuzzShaper::setFontFeatures() | 457 void HarfBuzzShaper::setFontFeatures() |
458 { | 458 { |
459 const FontDescription& description = m_font->fontDescription(); | 459 const FontDescription& description = m_font->fontDescription(); |
460 if (description.orientation() == Vertical) { | |
461 static hb_feature_t vert = { HarfBuzzFace::vertTag, 1, 0, static_cast<un
signed>(-1) }; | |
462 static hb_feature_t vrt2 = { HarfBuzzFace::vrt2Tag, 1, 0, static_cast<un
signed>(-1) }; | |
463 m_features.append(vert); | |
464 m_features.append(vrt2); | |
465 } | |
466 | 460 |
467 static hb_feature_t noKern = { HB_TAG('k', 'e', 'r', 'n'), 0, 0, static_cast
<unsigned>(-1) }; | 461 static hb_feature_t noKern = { HB_TAG('k', 'e', 'r', 'n'), 0, 0, static_cast
<unsigned>(-1) }; |
468 static hb_feature_t noVkrn = { HB_TAG('v', 'k', 'r', 'n'), 0, 0, static_cast
<unsigned>(-1) }; | 462 static hb_feature_t noVkrn = { HB_TAG('v', 'k', 'r', 'n'), 0, 0, static_cast
<unsigned>(-1) }; |
469 switch (description.kerning()) { | 463 switch (description.kerning()) { |
470 case FontDescription::NormalKerning: | 464 case FontDescription::NormalKerning: |
471 // kern/vkrn are enabled by default | 465 // kern/vkrn are enabled by default |
472 break; | 466 break; |
473 case FontDescription::NoneKerning: | 467 case FontDescription::NoneKerning: |
474 m_features.append(description.orientation() == Vertical ? noVkrn : noKer
n); | 468 m_features.append(description.orientation() == Vertical ? noVkrn : noKer
n); |
475 break; | 469 break; |
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778 // A port of hb_icu_script_to_script because harfbuzz on CrOS is built | 772 // A port of hb_icu_script_to_script because harfbuzz on CrOS is built |
779 // without hb-icu. See http://crbug.com/356929 | 773 // without hb-icu. See http://crbug.com/356929 |
780 static inline hb_script_t ICUScriptToHBScript(UScriptCode script) | 774 static inline hb_script_t ICUScriptToHBScript(UScriptCode script) |
781 { | 775 { |
782 if (UNLIKELY(script == USCRIPT_INVALID_CODE)) | 776 if (UNLIKELY(script == USCRIPT_INVALID_CODE)) |
783 return HB_SCRIPT_INVALID; | 777 return HB_SCRIPT_INVALID; |
784 | 778 |
785 return hb_script_from_string(uscript_getShortName(script), -1); | 779 return hb_script_from_string(uscript_getShortName(script), -1); |
786 } | 780 } |
787 | 781 |
788 static inline hb_direction_t TextDirectionToHBDirection(TextDirection dir) | 782 static inline hb_direction_t TextDirectionToHBDirection(TextDirection dir, FontO
rientation orientation, const SimpleFontData* fontData) |
789 { | 783 { |
790 return dir == RTL ? HB_DIRECTION_RTL : HB_DIRECTION_LTR; | 784 hb_direction_t harfBuzzDirection = orientation == Vertical && !fontData->isT
extOrientationFallback() ? HB_DIRECTION_TTB : HB_DIRECTION_LTR; |
| 785 return dir == RTL ? HB_DIRECTION_REVERSE(harfBuzzDirection) : harfBuzzDirect
ion; |
791 } | 786 } |
792 | 787 |
793 | 788 |
794 void HarfBuzzShaper::addHarfBuzzRun(unsigned startCharacter, | 789 void HarfBuzzShaper::addHarfBuzzRun(unsigned startCharacter, |
795 unsigned endCharacter, const SimpleFontData* fontData, | 790 unsigned endCharacter, const SimpleFontData* fontData, |
796 UScriptCode script) | 791 UScriptCode script) |
797 { | 792 { |
798 ASSERT(endCharacter > startCharacter); | 793 ASSERT(endCharacter > startCharacter); |
799 ASSERT(script != USCRIPT_INVALID_CODE); | 794 ASSERT(script != USCRIPT_INVALID_CODE); |
800 if (m_fallbackFonts) | 795 if (m_fallbackFonts) |
801 m_fallbackFonts->add(fontData); | 796 m_fallbackFonts->add(fontData); |
802 return m_harfBuzzRuns.append(HarfBuzzRun::create(fontData, | 797 return m_harfBuzzRuns.append(HarfBuzzRun::create(fontData, |
803 startCharacter, endCharacter - startCharacter, | 798 startCharacter, endCharacter - startCharacter, |
804 TextDirectionToHBDirection(m_run.direction()), | 799 TextDirectionToHBDirection(m_run.direction(), m_font->fontDescription().
orientation(), fontData), |
805 ICUScriptToHBScript(script))); | 800 ICUScriptToHBScript(script))); |
806 } | 801 } |
807 | 802 |
808 static const uint16_t* toUint16(const UChar* src) | 803 static const uint16_t* toUint16(const UChar* src) |
809 { | 804 { |
810 // FIXME: This relies on undefined behavior however it works on the | 805 // FIXME: This relies on undefined behavior however it works on the |
811 // current versions of all compilers we care about and avoids making | 806 // current versions of all compilers we care about and avoids making |
812 // a copy of the string. | 807 // a copy of the string. |
813 COMPILE_ASSERT(sizeof(UChar) == sizeof(uint16_t), UChar_is_the_same_size_as_
uint16_t); | 808 COMPILE_ASSERT(sizeof(UChar) == sizeof(uint16_t), UChar_is_the_same_size_as_
uint16_t); |
814 return reinterpret_cast<const uint16_t*>(src); | 809 return reinterpret_cast<const uint16_t*>(src); |
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901 uint16_t* glyphToCharacterIndexes = currentRun->glyphToCharacterIndexes(); | 896 uint16_t* glyphToCharacterIndexes = currentRun->glyphToCharacterIndexes(); |
902 float totalAdvance = 0; | 897 float totalAdvance = 0; |
903 FloatPoint glyphOrigin; | 898 FloatPoint glyphOrigin; |
904 | 899 |
905 // HarfBuzz returns the shaping result in visual order. We need not to flip
for RTL. | 900 // HarfBuzz returns the shaping result in visual order. We need not to flip
for RTL. |
906 for (size_t i = 0; i < numGlyphs; ++i) { | 901 for (size_t i = 0; i < numGlyphs; ++i) { |
907 bool runEnd = i + 1 == numGlyphs; | 902 bool runEnd = i + 1 == numGlyphs; |
908 uint16_t glyph = glyphInfos[i].codepoint; | 903 uint16_t glyph = glyphInfos[i].codepoint; |
909 float offsetX = harfBuzzPositionToFloat(glyphPositions[i].x_offset); | 904 float offsetX = harfBuzzPositionToFloat(glyphPositions[i].x_offset); |
910 float offsetY = -harfBuzzPositionToFloat(glyphPositions[i].y_offset); | 905 float offsetY = -harfBuzzPositionToFloat(glyphPositions[i].y_offset); |
911 float advance = harfBuzzPositionToFloat(glyphPositions[i].x_advance); | 906 // One out of x_advance and y_advance is zero, depending on |
| 907 // whether the buffer direction is horizontal or vertical. |
| 908 float advance = harfBuzzPositionToFloat(glyphPositions[i].x_advance + gl
yphPositions[i].y_advance); |
912 | 909 |
913 unsigned currentCharacterIndex = currentRun->startIndex() + glyphInfos[i
].cluster; | 910 unsigned currentCharacterIndex = currentRun->startIndex() + glyphInfos[i
].cluster; |
914 RELEASE_ASSERT(m_normalizedBufferLength > currentCharacterIndex); | 911 RELEASE_ASSERT(m_normalizedBufferLength > currentCharacterIndex); |
915 bool isClusterEnd = runEnd || glyphInfos[i].cluster != glyphInfos[i + 1]
.cluster; | 912 bool isClusterEnd = runEnd || glyphInfos[i].cluster != glyphInfos[i + 1]
.cluster; |
916 float spacing = 0; | 913 float spacing = 0; |
917 | 914 |
918 glyphToCharacterIndexes[i] = glyphInfos[i].cluster; | 915 glyphToCharacterIndexes[i] = glyphInfos[i].cluster; |
919 | 916 |
920 if (isClusterEnd && !Character::treatAsZeroWidthSpace(m_normalizedBuffer
[currentCharacterIndex])) | 917 if (isClusterEnd && !Character::treatAsZeroWidthSpace(m_normalizedBuffer
[currentCharacterIndex])) |
921 spacing += m_letterSpacing; | 918 spacing += m_letterSpacing; |
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1138 break; | 1135 break; |
1139 if (!m_run.rtl()) | 1136 if (!m_run.rtl()) |
1140 currentX += m_harfBuzzRuns[i]->width(); | 1137 currentX += m_harfBuzzRuns[i]->width(); |
1141 } | 1138 } |
1142 | 1139 |
1143 // The position in question might be just after the text. | 1140 // The position in question might be just after the text. |
1144 if (!foundFromX) | 1141 if (!foundFromX) |
1145 fromX = 0; | 1142 fromX = 0; |
1146 if (!foundToX) | 1143 if (!foundToX) |
1147 toX = m_run.rtl() ? 0 : m_totalWidth; | 1144 toX = m_run.rtl() ? 0 : m_totalWidth; |
| 1145 // None of our HarfBuzzRuns is part of the selection, |
| 1146 // possibly invalid from, to arguments. |
| 1147 if (!foundToX && !foundFromX) |
| 1148 fromX = toX = 0; |
1148 | 1149 |
1149 if (fromX < toX) | 1150 if (fromX < toX) |
1150 return FloatRect(point.x() + fromX, point.y(), toX - fromX, height); | 1151 return FloatRect(point.x() + fromX, point.y(), toX - fromX, height); |
1151 return FloatRect(point.x() + toX, point.y(), fromX - toX, height); | 1152 return FloatRect(point.x() + toX, point.y(), fromX - toX, height); |
1152 } | 1153 } |
1153 | 1154 |
1154 } // namespace blink | 1155 } // namespace blink |
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