79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
#include <mbgl/renderer/style_diff.hpp>
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#include <mbgl/style/layer_impl.hpp>
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#include <mbgl/util/immutable.hpp>
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#include <mbgl/util/variant.hpp>
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#include <mbgl/util/longest_common_subsequence.hpp>
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namespace mbgl {
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template <class T, class Eq>
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StyleDifference<T> diff(const Immutable<std::vector<T>>& a,
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const Immutable<std::vector<T>>& b,
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const Eq& eq) {
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StyleDifference<T> result;
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if (a == b) {
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return result;
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}
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std::vector<T> lcs;
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longest_common_subsequence(a->begin(), a->end(), b->begin(), b->end(), std::back_inserter(lcs), eq);
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auto aIt = a->begin();
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auto bIt = b->begin();
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auto lIt = lcs.begin();
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while (aIt != a->end() || bIt != b->end()) {
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if (aIt != a->end() && (lIt == lcs.end() || !eq(*lIt, *aIt))) {
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result.removed.emplace((*aIt)->id, *aIt);
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aIt++;
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} else if (bIt != b->end() && (lIt == lcs.end() || !eq(*lIt, *bIt))) {
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result.added.emplace((*bIt)->id, *bIt);
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bIt++;
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} else {
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if (aIt->get() != bIt->get()) {
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result.changed.emplace((*bIt)->id, StyleChange<T> { *aIt, *bIt });
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}
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aIt++;
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bIt++;
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lIt++;
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}
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}
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return result;
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}
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ImageDifference diffImages(const Immutable<std::vector<ImmutableImage>>& a,
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const Immutable<std::vector<ImmutableImage>>& b) {
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return diff(a, b, [] (const ImmutableImage& lhs, const ImmutableImage& rhs) {
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return lhs->id == rhs->id;
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});
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}
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SourceDifference diffSources(const Immutable<std::vector<ImmutableSource>>& a,
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const Immutable<std::vector<ImmutableSource>>& b) {
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return diff(a, b, [] (const ImmutableSource& lhs, const ImmutableSource& rhs) {
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return std::tie(lhs->id, lhs->type)
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== std::tie(rhs->id, rhs->type);
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});
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}
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LayerDifference diffLayers(const Immutable<std::vector<ImmutableLayer>>& a,
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const Immutable<std::vector<ImmutableLayer>>& b) {
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return diff(a, b, [] (const ImmutableLayer& lhs, const ImmutableLayer& rhs) {
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return (lhs->id == rhs->id) && (lhs->getTypeInfo() == rhs->getTypeInfo());
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});
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}
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bool hasLayoutDifference(const LayerDifference& layerDiff, const std::string& layerID) {
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if (layerDiff.added.count(layerID))
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return true;
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const auto it = layerDiff.changed.find(layerID);
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if (it == layerDiff.changed.end())
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return false;
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return it->second.before->hasLayoutDifference(*it->second.after);
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}
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} // namespace mbgl
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