blob: 627d9fe89b8268dafccbd7f93ae691e941ae91e3 [file] [log] [blame]
/*
* Copyright 2019 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/utils/SkShaperJSONWriter.h"
#include "include/core/SkFont.h"
#include "include/core/SkSpan.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/private/SkTo.h"
#include "src/utils/SkJSONWriter.h"
#include "src/utils/SkUTF.h"
#include <algorithm>
#include <cstddef>
#include <limits>
#include <string>
#include <type_traits>
SkShaperJSONWriter::SkShaperJSONWriter(SkJSONWriter* JSONWriter, const char* utf8, size_t size)
: fJSONWriter{JSONWriter}
, fUTF8{utf8, size} {}
void SkShaperJSONWriter::beginLine() { }
void SkShaperJSONWriter::runInfo(const SkShaper::RunHandler::RunInfo& info) { }
void SkShaperJSONWriter::commitRunInfo() { }
SkShaper::RunHandler::Buffer
SkShaperJSONWriter::runBuffer(const SkShaper::RunHandler::RunInfo& info) {
fGlyphs.resize(info.glyphCount);
fPositions.resize(info.glyphCount);
fClusters.resize(info.glyphCount);
return {fGlyphs.data(), fPositions.data(), nullptr, fClusters.data(), {0, 0}};
}
static bool is_one_to_one(const char utf8[], size_t utf8Begin, size_t utf8End,
std::vector<uint32_t>& clusters) {
size_t lastUtf8Index = utf8End;
auto checkCluster = [&](size_t clusterIndex) {
if (clusters[clusterIndex] >= lastUtf8Index) {
return false;
}
size_t utf8ClusterSize = lastUtf8Index - clusters[clusterIndex];
if (SkUTF::CountUTF8(&utf8[clusters[clusterIndex]], utf8ClusterSize) != 1) {
return false;
}
lastUtf8Index = clusters[clusterIndex];
return true;
};
if (clusters.front() <= clusters.back()) {
// left-to-right clusters
size_t clusterCursor = clusters.size();
while (clusterCursor > 0) {
if (!checkCluster(--clusterCursor)) { return false; }
}
} else {
// right-to-left clusters
size_t clusterCursor = 0;
while (clusterCursor < clusters.size()) {
if (!checkCluster(clusterCursor++)) { return false; }
}
}
return true;
}
void SkShaperJSONWriter::commitRunBuffer(const SkShaper::RunHandler::RunInfo& info) {
fJSONWriter->beginObject("run", true);
// Font name
SkString fontName;
info.fFont.getTypeface()->getFamilyName(&fontName);
fJSONWriter->appendString("font name", fontName);
// Font size
fJSONWriter->appendFloat("font size", info.fFont.getSize());
if (info.fBidiLevel > 0) {
std::string bidiType = info.fBidiLevel % 2 == 0 ? "left-to-right" : "right-to-left";
std::string bidiOutput = bidiType + " lvl " + std::to_string(info.fBidiLevel);
fJSONWriter->appendString("BiDi", bidiOutput);
}
if (is_one_to_one(fUTF8.c_str(), info.utf8Range.begin(), info.utf8Range.end(), fClusters)) {
std::string utf8{&fUTF8[info.utf8Range.begin()], info.utf8Range.size()};
fJSONWriter->appendString("UTF8", utf8);
fJSONWriter->beginArray("glyphs", false);
for (auto glyphID : fGlyphs) {
fJSONWriter->appendU32(glyphID);
}
fJSONWriter->endArray();
fJSONWriter->beginArray("clusters", false);
for (auto cluster : fClusters) {
fJSONWriter->appendU32(cluster);
}
fJSONWriter->endArray();
} else {
VisualizeClusters(fUTF8.c_str(),
info.utf8Range.begin(), info.utf8Range.end(),
SkSpan(fGlyphs),
SkSpan(fClusters),
[this](size_t codePointCount, SkSpan<const char> utf1to1,
SkSpan<const SkGlyphID> glyph1to1) {
this->displayMToN(codePointCount, utf1to1, glyph1to1);
});
}
if (info.glyphCount > 1) {
fJSONWriter->beginArray("horizontal positions", false);
for (auto position : fPositions) {
fJSONWriter->appendFloat(position.x());
}
fJSONWriter->endArray();
}
fJSONWriter->beginArray("advances", false);
for (size_t i = 1; i < info.glyphCount; i++) {
fJSONWriter->appendFloat(fPositions[i].fX - fPositions[i-1].fX);
}
SkPoint lastAdvance = info.fAdvance - (fPositions.back() - fPositions.front());
fJSONWriter->appendFloat(lastAdvance.fX);
fJSONWriter->endArray();
fJSONWriter->endObject();
}
void SkShaperJSONWriter::BreakupClusters(size_t utf8Begin, size_t utf8End,
SkSpan<const uint32_t> clusters,
const BreakupCluastersCallback& processMToN) {
if (clusters.front() <= clusters.back()) {
// Handle left-to-right text direction
size_t glyphStartIndex = 0;
for (size_t glyphEndIndex = 0; glyphEndIndex < clusters.size(); glyphEndIndex++) {
if (clusters[glyphStartIndex] == clusters[glyphEndIndex]) { continue; }
processMToN(glyphStartIndex, glyphEndIndex,
clusters[glyphStartIndex], clusters[glyphEndIndex]);
glyphStartIndex = glyphEndIndex;
}
processMToN(glyphStartIndex, clusters.size(), clusters[glyphStartIndex], utf8End);
} else {
// Handle right-to-left text direction.
SkASSERT(clusters.size() >= 2);
size_t glyphStartIndex = 0;
uint32_t utf8EndIndex = utf8End;
for (size_t glyphEndIndex = 0; glyphEndIndex < clusters.size(); glyphEndIndex++) {
if (clusters[glyphStartIndex] == clusters[glyphEndIndex]) { continue; }
processMToN(glyphStartIndex, glyphEndIndex,
clusters[glyphStartIndex], utf8EndIndex);
utf8EndIndex = clusters[glyphStartIndex];
glyphStartIndex = glyphEndIndex;
}
processMToN(glyphStartIndex, clusters.size(), utf8Begin, clusters[glyphStartIndex-1]);
}
}
void SkShaperJSONWriter::VisualizeClusters(const char* utf8, size_t utf8Begin, size_t utf8End,
SkSpan<const SkGlyphID> glyphIDs,
SkSpan<const uint32_t> clusters,
const VisualizeClustersCallback& processMToN) {
size_t glyphRangeStart, glyphRangeEnd;
uint32_t utf8RangeStart, utf8RangeEnd;
auto resetRanges = [&]() {
glyphRangeStart = std::numeric_limits<size_t>::max();
glyphRangeEnd = 0;
utf8RangeStart = std::numeric_limits<uint32_t>::max();
utf8RangeEnd = 0;
};
auto checkRangesAndProcess = [&]() {
if (glyphRangeStart < glyphRangeEnd) {
size_t glyphRangeCount = glyphRangeEnd - glyphRangeStart;
SkSpan<const char> utf8Span{&utf8[utf8RangeStart], utf8RangeEnd - utf8RangeStart};
SkSpan<const SkGlyphID> glyphSpan{&glyphIDs[glyphRangeStart], glyphRangeCount};
// Glyph count is the same as codepoint count for 1:1.
processMToN(glyphRangeCount, utf8Span, glyphSpan);
}
resetRanges();
};
auto gatherRuns = [&](size_t glyphStartIndex, size_t glyphEndIndex,
uint32_t utf8StartIndex, uint32_t utf8EndIndex) {
int possibleCount = SkUTF::CountUTF8(&utf8[utf8StartIndex], utf8EndIndex - utf8StartIndex);
if (possibleCount == -1) { return; }
size_t codePointCount = SkTo<size_t>(possibleCount);
if (codePointCount == 1 && glyphEndIndex - glyphStartIndex == 1) {
glyphRangeStart = std::min(glyphRangeStart, glyphStartIndex);
glyphRangeEnd = std::max(glyphRangeEnd, glyphEndIndex );
utf8RangeStart = std::min(utf8RangeStart, utf8StartIndex );
utf8RangeEnd = std::max(utf8RangeEnd, utf8EndIndex );
} else {
checkRangesAndProcess();
SkSpan<const char> utf8Span{&utf8[utf8StartIndex], utf8EndIndex - utf8StartIndex};
SkSpan<const SkGlyphID> glyphSpan{&glyphIDs[glyphStartIndex],
glyphEndIndex - glyphStartIndex};
processMToN(codePointCount, utf8Span, glyphSpan);
}
};
resetRanges();
BreakupClusters(utf8Begin, utf8End, clusters, gatherRuns);
checkRangesAndProcess();
}
void SkShaperJSONWriter::displayMToN(size_t codePointCount,
SkSpan<const char> utf8,
SkSpan<const SkGlyphID> glyphIDs) {
std::string nString = std::to_string(codePointCount);
std::string mString = std::to_string(glyphIDs.size());
std::string clusterName = "cluster " + nString + " to " + mString;
fJSONWriter->beginObject(clusterName.c_str(), true);
std::string utf8String{utf8.data(), utf8.size()};
fJSONWriter->appendString("UTF", utf8String);
fJSONWriter->beginArray("glyphsIDs", false);
for (auto glyphID : glyphIDs) {
fJSONWriter->appendU32(glyphID);
}
fJSONWriter->endArray();
fJSONWriter->endObject();
}