94f011895c
Provide Image::copy, which handles copying rectangles from a source to a destination, with thorough bounds checking. Also fixes an indexing error in SpriteAtlas, where the top row of pixels in a wrapped image was copied from the wrong source row.
135 lines
4.9 KiB
C++
135 lines
4.9 KiB
C++
#include <mbgl/text/glyph_pbf.hpp>
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#include <mbgl/text/glyph_atlas.hpp>
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#include <mbgl/text/glyph_atlas_observer.hpp>
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#include <mbgl/text/glyph_set.hpp>
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#include <mbgl/storage/file_source.hpp>
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#include <mbgl/storage/resource.hpp>
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#include <mbgl/storage/response.hpp>
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#include <mbgl/util/exception.hpp>
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#include <mbgl/util/string.hpp>
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#include <mbgl/util/token.hpp>
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#include <mbgl/util/url.hpp>
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#include <protozero/pbf_reader.hpp>
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namespace mbgl {
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namespace {
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void parseGlyphPBF(GlyphSet& glyphSet, const GlyphRange& glyphRange, const std::string& data) {
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protozero::pbf_reader glyphs_pbf(data);
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while (glyphs_pbf.next(1)) {
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auto fontstack_pbf = glyphs_pbf.get_message();
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while (fontstack_pbf.next(3)) {
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auto glyph_pbf = fontstack_pbf.get_message();
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SDFGlyph glyph;
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protozero::data_view glyphData;
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bool hasID = false, hasWidth = false, hasHeight = false, hasLeft = false,
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hasTop = false, hasAdvance = false;
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while (glyph_pbf.next()) {
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switch (glyph_pbf.tag()) {
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case 1: // id
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glyph.id = glyph_pbf.get_uint32();
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hasID = true;
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break;
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case 2: // bitmap
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glyphData = glyph_pbf.get_view();
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break;
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case 3: // width
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glyph.metrics.width = glyph_pbf.get_uint32();
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hasWidth = true;
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break;
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case 4: // height
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glyph.metrics.height = glyph_pbf.get_uint32();
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hasHeight = true;
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break;
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case 5: // left
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glyph.metrics.left = glyph_pbf.get_sint32();
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hasLeft = true;
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break;
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case 6: // top
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glyph.metrics.top = glyph_pbf.get_sint32();
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hasTop = true;
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break;
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case 7: // advance
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glyph.metrics.advance = glyph_pbf.get_uint32();
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hasAdvance = true;
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break;
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default:
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glyph_pbf.skip();
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break;
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}
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}
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// Only treat this glyph as a correct glyph if it has all required fields. It also
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// needs to satisfy a few metrics conditions that ensure that the glyph isn't bogus.
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// All other glyphs are malformed. We're also discarding all glyphs that are outside
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// the expected glyph range.
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if (!hasID || !hasWidth || !hasHeight || !hasLeft || !hasTop || !hasAdvance ||
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glyph.metrics.width >= 256 || glyph.metrics.height >= 256 ||
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glyph.metrics.left < -128 || glyph.metrics.left >= 128 ||
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glyph.metrics.top < -128 || glyph.metrics.top >= 128 ||
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glyph.metrics.advance >= 256 ||
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glyph.id < glyphRange.first || glyph.id > glyphRange.second) {
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continue;
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}
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// If the area of width/height is non-zero, we need to adjust the expected size
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// with the implicit border size, otherwise we expect there to be no bitmap at all.
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if (glyph.metrics.width && glyph.metrics.height) {
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const Size size {
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glyph.metrics.width + 2 * SDFGlyph::borderSize,
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glyph.metrics.height + 2 * SDFGlyph::borderSize
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};
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if (size.area() != glyphData.size()) {
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continue;
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}
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glyph.bitmap = AlphaImage(size, reinterpret_cast<const uint8_t*>(glyphData.data()), glyphData.size());
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}
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glyphSet.insert(glyph.id, std::move(glyph));
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}
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}
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}
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} // namespace
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GlyphPBF::GlyphPBF(GlyphAtlas* atlas,
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const FontStack& fontStack,
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const GlyphRange& glyphRange,
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GlyphAtlasObserver* observer_,
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FileSource& fileSource)
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: parsed(false),
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observer(observer_) {
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req = fileSource.request(Resource::glyphs(atlas->getURL(), fontStack, glyphRange), [this, atlas, fontStack, glyphRange](Response res) {
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if (res.error) {
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observer->onGlyphsError(fontStack, glyphRange, std::make_exception_ptr(std::runtime_error(res.error->message)));
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} else if (res.notModified) {
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return;
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} else if (res.noContent) {
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parsed = true;
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observer->onGlyphsLoaded(fontStack, glyphRange);
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} else {
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try {
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parseGlyphPBF(**atlas->getGlyphSet(fontStack), glyphRange, *res.data);
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} catch (...) {
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observer->onGlyphsError(fontStack, glyphRange, std::current_exception());
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return;
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}
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parsed = true;
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observer->onGlyphsLoaded(fontStack, glyphRange);
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}
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});
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}
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GlyphPBF::~GlyphPBF() = default;
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} // namespace mbgl
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