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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/glyph_store_observer.hpp>
#include <mbgl/text/glyph_set.hpp>
#include <mbgl/util/exception.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/token.hpp>
#include <mbgl/util/url.hpp>
#include <protozero/pbf_reader.hpp>
namespace {
void parseGlyphPBF(mbgl::GlyphSet& glyphSet, const std::string& data) {
protozero::pbf_reader glyphs_pbf(data);
while (glyphs_pbf.next(1)) {
auto fontstack_pbf = glyphs_pbf.get_message();
while (fontstack_pbf.next(3)) {
auto glyph_pbf = fontstack_pbf.get_message();
mbgl::SDFGlyph glyph;
while (glyph_pbf.next()) {
switch (glyph_pbf.tag()) {
case 1: // id
glyph.id = glyph_pbf.get_uint32();
break;
case 2: // bitmap
glyph.bitmap = glyph_pbf.get_string();
break;
case 3: // width
glyph.metrics.width = glyph_pbf.get_uint32();
break;
case 4: // height
glyph.metrics.height = glyph_pbf.get_uint32();
break;
case 5: // left
glyph.metrics.left = glyph_pbf.get_sint32();
break;
case 6: // top
glyph.metrics.top = glyph_pbf.get_sint32();
break;
case 7: // advance
glyph.metrics.advance = glyph_pbf.get_uint32();
break;
default:
glyph_pbf.skip();
break;
}
}
glyphSet.insert(glyph.id, std::move(glyph));
}
}
}
} // namespace
namespace mbgl {
GlyphPBF::GlyphPBF(GlyphStore* store,
const FontStack& fontStack,
const GlyphRange& glyphRange,
GlyphStoreObserver* observer_,
FileSource& fileSource)
: parsed(false),
observer(observer_) {
req = fileSource.request(Resource::glyphs(store->getURL(), fontStack, glyphRange), [this, store, fontStack, glyphRange](Response res) {
if (res.error) {
observer->onGlyphsError(fontStack, glyphRange, std::make_exception_ptr(std::runtime_error(res.error->message)));
} else if (res.notModified) {
return;
} else if (res.noContent) {
parsed = true;
observer->onGlyphsLoaded(fontStack, glyphRange);
} else {
try {
parseGlyphPBF(**store->getGlyphSet(fontStack), *res.data);
} catch (...) {
observer->onGlyphsError(fontStack, glyphRange, std::current_exception());
return;
}
parsed = true;
observer->onGlyphsLoaded(fontStack, glyphRange);
}
});
}
GlyphPBF::~GlyphPBF() = default;
} // namespace mbgl
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