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Codechange: Improve LineCache queries (#9417)

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Adds the support to query the linecache without copying the string.
This uses a custom transparent comparator in conjunction with
a query type using a std::string_view.
This commit is contained in:
Frédéric Simonis 2021-08-16 11:18:47 +02:00 committed by GitHub
parent 2e6a77a78a
commit ac4a7d02c7
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 26 additions and 7 deletions
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6
src/gfx_layout.cpp
View File

@ -888,6 +888,12 @@ Layouter::LineCacheItem &Layouter::GetCachedParagraphLayout(const char *str, siz
linecache = new LineCache();
}
if (auto match = linecache->find(LineCacheQuery{state, std::string_view{str, len}});
match != linecache->end()) {
return match->second;
}
/* Create missing entry */
LineCacheKey key;
key.state_before = state;
key.str.assign(str, len);

27
src/gfx_layout.h
View File

@ -17,6 +17,8 @@
#include <map>
#include <string>
#include <stack>
#include <string_view>
#include <type_traits>
#include <vector>
#ifdef WITH_ICU_LX
@ -155,14 +157,25 @@ class Layouter : public std::vector<std::unique_ptr<const ParagraphLayouter::Lin
struct LineCacheKey {
FontState state_before; ///< Font state at the beginning of the line.
std::string str; ///< Source string of the line (including colour and font size codes).
};
/** Comparison operator for std::map */
bool operator<(const LineCacheKey &other) const
struct LineCacheQuery {
FontState state_before; ///< Font state at the beginning of the line.
std::string_view str; ///< Source string of the line (including colour and font size codes).
};
/** Comparator for std::map */
struct LineCacheCompare {
using is_transparent = void; ///< Enable map queries with various key types
/** Comparison operator for LineCacheKey and LineCacheQuery */
template<typename Key1, typename Key2>
bool operator()(const Key1 &lhs, const Key2 &rhs) const
{
if (this->state_before.fontsize != other.state_before.fontsize) return this->state_before.fontsize < other.state_before.fontsize;
if (this->state_before.cur_colour != other.state_before.cur_colour) return this->state_before.cur_colour < other.state_before.cur_colour;
if (this->state_before.colour_stack != other.state_before.colour_stack) return this->state_before.colour_stack < other.state_before.colour_stack;
return this->str < other.str;
if (lhs.state_before.fontsize != rhs.state_before.fontsize) return lhs.state_before.fontsize < rhs.state_before.fontsize;
if (lhs.state_before.cur_colour != rhs.state_before.cur_colour) return lhs.state_before.cur_colour < rhs.state_before.cur_colour;
if (lhs.state_before.colour_stack != rhs.state_before.colour_stack) return lhs.state_before.colour_stack < rhs.state_before.colour_stack;
return lhs.str < rhs.str;
}
};
public:
@ -179,7 +192,7 @@ public:
~LineCacheItem() { delete layout; free(buffer); }
};
private:
typedef std::map<LineCacheKey, LineCacheItem> LineCache;
typedef std::map<LineCacheKey, LineCacheItem, LineCacheCompare> LineCache;
static LineCache *linecache;
static LineCacheItem &GetCachedParagraphLayout(const char *str, size_t len, const FontState &state);