| // Copyright 2019 Google LLC. |
| #include "include/core/SkPaint.h" |
| #include "modules/skparagraph/include/ParagraphStyle.h" |
| #include "modules/skparagraph/src/ParagraphBuilderImpl.h" |
| #include "modules/skparagraph/src/ParagraphImpl.h" |
| #include "src/core/SkMakeUnique.h" |
| #include "src/core/SkSpan.h" |
| #include "unicode/unistr.h" |
| |
| namespace skia { |
| namespace textlayout { |
| |
| std::unique_ptr<ParagraphBuilder> ParagraphBuilder::make( |
| const ParagraphStyle& style, sk_sp<FontCollection> fontCollection) { |
| return skstd::make_unique<ParagraphBuilderImpl>(style, fontCollection); |
| } |
| |
| ParagraphBuilderImpl::ParagraphBuilderImpl( |
| const ParagraphStyle& style, sk_sp<FontCollection> fontCollection) |
| : ParagraphBuilder(style, fontCollection), fUtf8(), fFontCollection(std::move(fontCollection)) { |
| this->setParagraphStyle(style); |
| } |
| |
| ParagraphBuilderImpl::~ParagraphBuilderImpl() = default; |
| |
| void ParagraphBuilderImpl::setParagraphStyle(const ParagraphStyle& style) { |
| fParagraphStyle = style; |
| fTextStyles.push(fParagraphStyle.getTextStyle()); |
| fStyledBlocks.emplace_back(fUtf8.size(), fUtf8.size(), fParagraphStyle.getTextStyle()); |
| } |
| |
| void ParagraphBuilderImpl::pushStyle(const TextStyle& style) { |
| this->endRunIfNeeded(); |
| |
| fTextStyles.push(style); |
| if (!fStyledBlocks.empty() && fStyledBlocks.back().fRange.end == fUtf8.size() && |
| fStyledBlocks.back().fStyle == style) { |
| // Just continue with the same style |
| } else { |
| // Go with the new style |
| fStyledBlocks.emplace_back(fUtf8.size(), fUtf8.size(), fTextStyles.top()); |
| } |
| } |
| |
| void ParagraphBuilderImpl::pop() { |
| this->endRunIfNeeded(); |
| |
| if (fTextStyles.size() > 1) { |
| fTextStyles.pop(); |
| } else { |
| // In this case we use paragraph style and skip Pop operation |
| SkDEBUGF("SkParagraphBuilder.Pop() called too many times.\n"); |
| } |
| |
| auto top = fTextStyles.top(); |
| fStyledBlocks.emplace_back(fUtf8.size(), fUtf8.size(), top); |
| } |
| |
| TextStyle ParagraphBuilderImpl::peekStyle() { |
| this->endRunIfNeeded(); |
| |
| if (!fTextStyles.empty()) { |
| return fTextStyles.top(); |
| } else { |
| SkDebugf("SkParagraphBuilder._styles is empty.\n"); |
| return fParagraphStyle.getTextStyle(); |
| } |
| } |
| |
| void ParagraphBuilderImpl::addText(const std::u16string& text) { |
| icu::UnicodeString unicode; |
| unicode.setTo((UChar*)text.data()); |
| std::string str; |
| unicode.toUTF8String(str); |
| fUtf8.insert(fUtf8.size(), str.c_str()); |
| |
| UText utf16UText = UTEXT_INITIALIZER; |
| UErrorCode errorCode = U_ZERO_ERROR; |
| |
| auto iter = ubrk_open(UBRK_WORD, icu::Locale().getName(), nullptr, 0, &errorCode); |
| if (U_FAILURE(errorCode)) { |
| SkDEBUGF("Could not create line break iterator: %s", u_errorName(errorCode)); |
| return; |
| } |
| |
| utext_openUnicodeString(&utf16UText, &unicode, &errorCode); |
| if (U_FAILURE(errorCode)) { |
| SkDEBUGF("Could not create utf8UText: %s", u_errorName(errorCode)); |
| return; |
| } |
| |
| ubrk_setUText(iter, &utf16UText, &errorCode); |
| if (U_FAILURE(errorCode)) { |
| SkDEBUGF("Could not setText on break iterator: %s", u_errorName(errorCode)); |
| return; |
| } |
| } |
| |
| void ParagraphBuilderImpl::addText(const char* text) { |
| fUtf8.insert(fUtf8.size(), text); |
| } |
| |
| void ParagraphBuilderImpl::addText(const char* text, size_t len) { |
| fUtf8.insert(fUtf8.size(), text, len); |
| } |
| |
| void ParagraphBuilderImpl::addPlaceholder(const PlaceholderStyle& placeholderStyle) { |
| addPlaceholder(placeholderStyle, false); |
| } |
| |
| void ParagraphBuilderImpl::addPlaceholder(const PlaceholderStyle& placeholderStyle, bool lastOne) { |
| this->endRunIfNeeded(); |
| |
| BlockRange stylesBefore(fPlaceholders.empty() ? 0 : fPlaceholders.back().fBlocksBefore.end + 1, |
| fStyledBlocks.size()); |
| TextRange textBefore(fPlaceholders.empty() ? 0 : fPlaceholders.back().fRange.end, |
| fUtf8.size()); |
| auto start = fUtf8.size(); |
| auto topStyle = fTextStyles.top(); |
| if (!lastOne) { |
| pushStyle(TextStyle(topStyle, true)); |
| addText(std::u16string(1ull, 0xFFFC)); |
| pop(); |
| } |
| auto end = fUtf8.size(); |
| fPlaceholders.emplace_back(start, end, placeholderStyle, topStyle, stylesBefore, textBefore); |
| } |
| |
| void ParagraphBuilderImpl::endRunIfNeeded() { |
| if (fStyledBlocks.empty()) { |
| return; |
| } |
| |
| auto& last = fStyledBlocks.back(); |
| if (last.fRange.start == fUtf8.size()) { |
| fStyledBlocks.pop_back(); |
| } else { |
| last.fRange.end = fUtf8.size(); |
| } |
| } |
| |
| std::unique_ptr<Paragraph> ParagraphBuilderImpl::Build() { |
| if (!fUtf8.isEmpty()) { |
| this->endRunIfNeeded(); |
| } |
| |
| // Add one fake placeholder with the rest of the text |
| addPlaceholder(PlaceholderStyle(), true); |
| return skstd::make_unique<ParagraphImpl>( |
| fUtf8, fParagraphStyle, fStyledBlocks, fPlaceholders, fFontCollection); |
| } |
| |
| } // namespace textlayout |
| } // namespace skia |