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ParagraphBuilderImpl.cpp
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ParagraphBuilderImpl.cpp
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// Copyright 2019 Google LLC.
#include "include/core/SkTypes.h"
#include "modules/skparagraph/include/FontCollection.h"
#include "modules/skparagraph/include/Paragraph.h"
#include "modules/skparagraph/include/ParagraphBuilder.h"
#include "modules/skparagraph/include/ParagraphStyle.h"
#include "modules/skparagraph/include/TextStyle.h"
#include "modules/skparagraph/src/ParagraphBuilderImpl.h"
#include "modules/skparagraph/src/ParagraphImpl.h"
#include <algorithm>
#include <utility>
#include "src/core/SkStringUtils.h"
namespace skia {
namespace textlayout {
std::unique_ptr<ParagraphBuilder> ParagraphBuilder::make(
const ParagraphStyle& style, sk_sp<FontCollection> fontCollection) {
return ParagraphBuilderImpl::make(style, fontCollection);
}
std::unique_ptr<ParagraphBuilder> ParagraphBuilderImpl::make(
const ParagraphStyle& style, sk_sp<FontCollection> fontCollection) {
return std::make_unique<ParagraphBuilderImpl>(style, fontCollection);
}
std::unique_ptr<ParagraphBuilder> ParagraphBuilderImpl::make(
const ParagraphStyle& style, sk_sp<FontCollection> fontCollection, std::unique_ptr<SkUnicode> unicode) {
if (nullptr == unicode) {
return nullptr;
}
return std::make_unique<ParagraphBuilderImpl>(style, fontCollection, std::move(unicode));
}
ParagraphBuilderImpl::ParagraphBuilderImpl(
const ParagraphStyle& style, sk_sp<FontCollection> fontCollection, std::unique_ptr<SkUnicode> unicode)
: ParagraphBuilder(style, fontCollection)
, fUtf8()
, fFontCollection(std::move(fontCollection))
, fParagraphStyle(style)
, fUnicode(std::move(unicode))
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
, fTextIsFinalized(false)
, fUsingClientInfo(false)
#endif
{
startStyledBlock();
}
ParagraphBuilderImpl::ParagraphBuilderImpl(
const ParagraphStyle& style, sk_sp<FontCollection> fontCollection)
: ParagraphBuilderImpl(style, fontCollection, SkUnicode::Make())
{ }
ParagraphBuilderImpl::~ParagraphBuilderImpl() = default;
void ParagraphBuilderImpl::pushStyle(const TextStyle& style) {
fTextStyles.push_back(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
startStyledBlock();
}
}
void ParagraphBuilderImpl::pop() {
if (!fTextStyles.empty()) {
fTextStyles.pop_back();
} else {
// In this case we use paragraph style and skip Pop operation
SkDEBUGF("SkParagraphBuilder.Pop() called too many times.\n");
}
this->startStyledBlock();
}
const TextStyle& ParagraphBuilderImpl::internalPeekStyle() {
if (fTextStyles.empty()) {
return fParagraphStyle.getTextStyle();
} else {
return fTextStyles.back();
}
}
TextStyle ParagraphBuilderImpl::peekStyle() {
return this->internalPeekStyle();
}
void ParagraphBuilderImpl::addText(const std::u16string& text) {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(!fTextIsFinalized);
#endif
auto utf8 = SkUnicode::convertUtf16ToUtf8(text);
fUtf8.append(utf8);
}
void ParagraphBuilderImpl::addText(const char* text) {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(!fTextIsFinalized);
#endif
fUtf8.append(text);
}
void ParagraphBuilderImpl::addText(const char* text, size_t len) {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(!fTextIsFinalized);
#endif
fUtf8.append(text, len);
}
void ParagraphBuilderImpl::addPlaceholder(const PlaceholderStyle& placeholderStyle) {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(!fTextIsFinalized);
#endif
addPlaceholder(placeholderStyle, false);
}
void ParagraphBuilderImpl::addPlaceholder(const PlaceholderStyle& placeholderStyle, bool lastOne) {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(!fTextIsFinalized);
#endif
if (!fUtf8.isEmpty() && !lastOne) {
// We keep the very last text style
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 = internalPeekStyle();
if (!lastOne) {
pushStyle(topStyle.cloneForPlaceholder());
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();
}
}
void ParagraphBuilderImpl::startStyledBlock() {
endRunIfNeeded();
fStyledBlocks.emplace_back(fUtf8.size(), fUtf8.size(), internalPeekStyle());
}
void ParagraphBuilderImpl::finalize() {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
if (fTextIsFinalized) {
return;
}
#endif
if (!fUtf8.isEmpty()) {
this->endRunIfNeeded();
}
// Add one fake placeholder with the rest of the text
this->addPlaceholder(PlaceholderStyle(), true);
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
fTextIsFinalized = true;
#endif
}
std::unique_ptr<Paragraph> ParagraphBuilderImpl::Build() {
this->finalize();
this->addPlaceholder(PlaceholderStyle(), true);
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
SkASSERT(fUsingClientInfo);
fUTF8IndexForUTF16Index.clear();
fUTF16IndexForUTF8Index.clear();
// This is the place where SkUnicode is paired with SkParagraph
fUnicode = SkUnicode::MakeClientBasedUnicode(this->getText(),
std::move(fWordsUtf16),
std::move(fGraphemeBreaksUtf8),
std::move(fLineBreaksUtf8));
#endif
SkASSERT(fUnicode);
return std::make_unique<ParagraphImpl>(
fUtf8, fParagraphStyle, fStyledBlocks, fPlaceholders, fFontCollection, fUnicode);
}
SkSpan<char> ParagraphBuilderImpl::getText() {
this->finalize();
return SkSpan<char>(fUtf8.isEmpty() ? nullptr : fUtf8.data(), fUtf8.size());
}
const ParagraphStyle& ParagraphBuilderImpl::getParagraphStyle() const {
return fParagraphStyle;
}
void ParagraphBuilderImpl::ensureUTF16Mapping() {
fillUTF16MappingOnce([&] {
SkUnicode::extractUtfConversionMapping(
this->getText(),
[&](size_t index) { fUTF8IndexForUTF16Index.emplace_back(index); },
[&](size_t index) { fUTF16IndexForUTF8Index.emplace_back(index); });
});
}
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
void ParagraphBuilderImpl::setWordsUtf8(std::vector<SkUnicode::Position> wordsUtf8) {
ensureUTF16Mapping();
std::vector<SkUnicode::Position> wordsUtf16;
for (SkUnicode::Position indexUtf8: wordsUtf8) {
wordsUtf16.emplace_back(fUTF16IndexForUTF8Index[indexUtf8]);
}
setWordsUtf16(wordsUtf16);
}
void ParagraphBuilderImpl::setWordsUtf16(std::vector<SkUnicode::Position> wordsUtf16) {
fUsingClientInfo = true;
fWordsUtf16 = std::move(wordsUtf16);
}
void ParagraphBuilderImpl::setGraphemeBreaksUtf8(std::vector<SkUnicode::Position> graphemeBreaksUtf8) {
fUsingClientInfo = true;
fGraphemeBreaksUtf8 = std::move(graphemeBreaksUtf8);
}
void ParagraphBuilderImpl::setGraphemeBreaksUtf16(std::vector<SkUnicode::Position> graphemeBreaksUtf16) {
ensureUTF16Mapping();
std::vector<SkUnicode::Position> graphemeBreaksUtf8;
for (SkUnicode::Position indexUtf16: graphemeBreaksUtf16) {
graphemeBreaksUtf8.emplace_back(fUTF8IndexForUTF16Index[indexUtf16]);
}
setGraphemeBreaksUtf8(graphemeBreaksUtf8);
}
void ParagraphBuilderImpl::setLineBreaksUtf8(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf8) {
fUsingClientInfo = true;
fLineBreaksUtf8 = std::move(lineBreaksUtf8);
}
void ParagraphBuilderImpl::setLineBreaksUtf16(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf16) {
ensureUTF16Mapping();
std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf8;
for (SkUnicode::LineBreakBefore lineBreakUtf16: lineBreaksUtf16) {
lineBreaksUtf8.emplace_back(SkUnicode::LineBreakBefore(
fUTF8IndexForUTF16Index[lineBreakUtf16.pos], lineBreakUtf16.breakType));
}
setLineBreaksUtf8(lineBreaksUtf8);
}
#else
void ParagraphBuilderImpl::setWordsUtf8(std::vector<SkUnicode::Position> wordsUtf8) {
SkASSERT(false);
}
void ParagraphBuilderImpl::setWordsUtf16(std::vector<SkUnicode::Position> wordsUtf16) {
SkASSERT(false);
}
void ParagraphBuilderImpl::setGraphemeBreaksUtf8(std::vector<SkUnicode::Position> graphemesUtf8) {
SkASSERT(false);
}
void ParagraphBuilderImpl::setGraphemeBreaksUtf16(std::vector<SkUnicode::Position> graphemesUtf16) {
SkASSERT(false);
}
void ParagraphBuilderImpl::setLineBreaksUtf8(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf8) {
SkASSERT(false);
}
void ParagraphBuilderImpl::setLineBreaksUtf16(std::vector<SkUnicode::LineBreakBefore> lineBreaksUtf16) {
SkASSERT(false);
}
#endif
void ParagraphBuilderImpl::Reset() {
fTextStyles.clear();
fUtf8.reset();
fStyledBlocks.clear();
fPlaceholders.clear();
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
fUTF8IndexForUTF16Index.clear();
fUTF16IndexForUTF8Index.clear();
fWordsUtf16.clear();
fGraphemeBreaksUtf8.clear();
fLineBreaksUtf8.clear();
fTextIsFinalized = false;
#endif
startStyledBlock();
}
bool ParagraphBuilderImpl::RequiresClientICU() {
#if defined(SK_UNICODE_CLIENT_IMPLEMENTATION)
return true;
#else
return false;
#endif
}
} // namespace textlayout
} // namespace skia