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#include <mbgl/text/glyph_pbf.hpp>
#include <mbgl/storage/file_source.hpp>
#include <mbgl/storage/resource.hpp>
#include <mbgl/storage/response.hpp>
#include <mbgl/text/font_stack.hpp>
#include <mbgl/text/glyph_store.hpp>
#include <mbgl/util/exception.hpp>
#include <mbgl/util/pbf.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/thread_context.hpp>
#include <mbgl/util/token.hpp>
#include <mbgl/util/url.hpp>
#include <sstream>
namespace {
void parseGlyphPBF(mbgl::FontStack& stack, const std::string& data) {
mbgl::pbf glyphs_pbf(reinterpret_cast<const uint8_t *>(data.data()), data.size());
while (glyphs_pbf.next()) {
if (glyphs_pbf.tag == 1) { // stacks
mbgl::pbf fontstack_pbf = glyphs_pbf.message();
while (fontstack_pbf.next()) {
if (fontstack_pbf.tag == 3) { // glyphs
mbgl::pbf glyph_pbf = fontstack_pbf.message();
mbgl::SDFGlyph glyph;
while (glyph_pbf.next()) {
if (glyph_pbf.tag == 1) { // id
glyph.id = glyph_pbf.varint();
} else if (glyph_pbf.tag == 2) { // bitmap
glyph.bitmap = glyph_pbf.string();
} else if (glyph_pbf.tag == 3) { // width
glyph.metrics.width = glyph_pbf.varint();
} else if (glyph_pbf.tag == 4) { // height
glyph.metrics.height = glyph_pbf.varint();
} else if (glyph_pbf.tag == 5) { // left
glyph.metrics.left = glyph_pbf.svarint();
} else if (glyph_pbf.tag == 6) { // top
glyph.metrics.top = glyph_pbf.svarint();
} else if (glyph_pbf.tag == 7) { // advance
glyph.metrics.advance = glyph_pbf.varint();
} else {
glyph_pbf.skip();
}
}
stack.insert(glyph.id, glyph);
} else {
fontstack_pbf.skip();
}
}
} else {
glyphs_pbf.skip();
}
}
}
} // namespace
namespace mbgl {
GlyphPBF::GlyphPBF(GlyphStore* store,
const std::string& fontStack,
const GlyphRange& glyphRange)
: parsed(false) {
// Load the glyph set URL
std::string url = util::replaceTokens(store->getURL(), [&](const std::string &name) -> std::string {
if (name == "fontstack") return util::percentEncode(fontStack);
if (name == "range") return util::toString(glyphRange.first) + "-" + util::toString(glyphRange.second);
return "";
});
auto requestCallback = [this, store, fontStack, url](Response res) {
if (res.stale) {
// Only handle fresh responses.
return;
}
req = nullptr;
if (res.error) {
std::stringstream message;
message << "Failed to load [" << url << "]: " << res.error->message;
emitGlyphPBFLoadingFailed(message.str());
} else {
data = res.data;
parse(store, fontStack, url);
}
};
FileSource* fs = util::ThreadContext::getFileSource();
req = fs->request({ Resource::Kind::Glyphs, url }, requestCallback);
}
GlyphPBF::~GlyphPBF() = default;
void GlyphPBF::parse(GlyphStore* store, const std::string& fontStack, const std::string& url) {
assert(data);
if (data->empty()) {
// If there is no data, this means we either haven't
// received any data.
return;
}
try {
parseGlyphPBF(**store->getFontStack(fontStack), *data);
} catch (const std::exception& ex) {
std::stringstream message;
message << "Failed to parse [" << url << "]: " << ex.what();
emitGlyphPBFLoadingFailed(message.str());
return;
}
parsed = true;
emitGlyphPBFLoaded();
}
void GlyphPBF::setObserver(Observer* observer_) {
observer = observer_;
}
void GlyphPBF::emitGlyphPBFLoaded() {
if (observer) {
observer->onGlyphPBFLoaded();
}
}
void GlyphPBF::emitGlyphPBFLoadingFailed(const std::string& message) {
if (!observer) {
return;
}
auto error = std::make_exception_ptr(util::GlyphRangeLoadingException(message));
observer->onGlyphPBFLoadingFailed(error);
}
} // namespace mbgl
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