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Core/StringExt: Add IterateOnCodepoints to remove std::u32string allocations

This commit is contained in:
SirLynix 2023-08-24 08:42:25 +02:00
parent bd53245f42
commit ad738a2803
6 changed files with 187 additions and 164 deletions
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3
include/Nazara/Core/StringExt.hpp
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@ -10,6 +10,7 @@
#include <NazaraUtils/Prerequisites.hpp>
#include <Nazara/Core/Unicode.hpp>
#include <NazaraUtils/Algorithm.hpp>
#include <NazaraUtils/FunctionRef.hpp>
#include <string>
namespace Nz
@ -35,6 +36,8 @@ namespace Nz
inline bool IsNumber(std::string_view str);
NAZARA_CORE_API void IterateOnCodepoints(std::string_view str, FunctionRef<bool(const char32_t* characters, std::size_t characterCount)> callback);
NAZARA_CORE_API bool MatchPattern(std::string_view str, std::string_view pattern);
inline std::string NumberToString(long long number, UInt8 radix = 10);

2
include/Nazara/Utility/Font.hpp
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@ -73,7 +73,7 @@ namespace Nz
bool IsValid() const;
bool Precache(unsigned int characterSize, TextStyleFlags style, float outlineThickness, char32_t character) const;
bool Precache(unsigned int characterSize, TextStyleFlags style, float outlineThickness, const std::string& characterSet) const;
bool Precache(unsigned int characterSize, TextStyleFlags style, float outlineThickness, std::string_view characterSet) const;
void SetAtlas(std::shared_ptr<AbstractAtlas> atlas);
void SetGlyphBorder(unsigned int borderSize);

23
src/Nazara/Core/StringExt.cpp
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@ -259,6 +259,29 @@ namespace Nz
return {};
}
void IterateOnCodepoints(std::string_view str, FunctionRef<bool(const char32_t* characters, std::size_t characterCount)> callback)
{
std::array<char32_t, 32> buffer;
std::size_t charCount = 0;
utf8::unchecked::iterator<const char*> it(str.data());
utf8::unchecked::iterator<const char*> end(str.data() + str.size());
for (; it != end; ++it)
{
buffer[charCount++] = *it;
if (charCount == buffer.size())
{
if (!callback(&buffer[0], charCount))
return;
charCount = 0;
}
}
if (charCount != 0)
callback(&buffer[0], charCount);
}
bool MatchPattern(std::string_view str, std::string_view pattern)
{
if (str.empty() || pattern.empty())

20
src/Nazara/Utility/Font.cpp
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@ -256,20 +256,20 @@ namespace Nz
return PrecacheGlyph(m_glyphes[key], characterSize, style, outlineThickness, character).valid;
}
bool Font::Precache(unsigned int characterSize, TextStyleFlags style, float outlineThickness, const std::string& characterSet) const
bool Font::Precache(unsigned int characterSize, TextStyleFlags style, float outlineThickness, std::string_view characterSet) const
{
///TODO: Itération UTF-8 => UTF-32 sans allocation de buffer (Exposer utf8cpp ?)
std::u32string set = ToUtf32String(characterSet);
if (set.empty())
{
NazaraError("Invalid character set");
return false;
}
NazaraAssert(!characterSet.empty(), "empty character set");
UInt64 key = ComputeKey(characterSize, style, outlineThickness);
auto& glyphMap = m_glyphes[key];
for (char32_t character : set)
PrecacheGlyph(glyphMap, characterSize, style, outlineThickness, character);
IterateOnCodepoints(characterSet, [&](const char32_t* characters, std::size_t characterCount)
{
for (std::size_t i = 0; i < characterCount; ++i)
PrecacheGlyph(glyphMap, characterSize, style, outlineThickness, characters[i]);
return true;
});
return true;
}

18
src/Nazara/Utility/RichTextDrawer.cpp
View File

@ -381,14 +381,6 @@ namespace Nz
if (text.empty())
return;
///TODO: Allow iteration on Unicode characters without allocating any buffer
std::u32string characters = ToUtf32String(text);
if (characters.empty())
{
NazaraError("Invalid character set");
return;
}
char32_t previousCharacter = 0;
const Font::SizeInfo& sizeInfo = font.GetSizeInfo(characterSize);
@ -410,9 +402,12 @@ namespace Nz
m_lines.back().bounds.height += heightDifference;
}
m_glyphs.reserve(m_glyphs.size() + characters.size() * ((outlineThickness > 0.f) ? 2 : 1));
for (char32_t character : characters)
IterateOnCodepoints(text, [&](const char32_t* characters, std::size_t characterCount)
{
for (std::size_t i = 0; i < characterCount; ++i)
{
char32_t character = characters[i];
if (previousCharacter != 0)
m_drawPos.x += font.GetKerning(characterSize, previousCharacter, character);
@ -490,6 +485,9 @@ namespace Nz
m_glyphs.push_back(glyph);
}
return true; //< continue iteration
});
m_bounds.ExtendTo(m_lines.back().bounds);
m_glyphUpdated = true;

19
src/Nazara/Utility/SimpleTextDrawer.cpp
View File

@ -187,19 +187,15 @@ namespace Nz
if (text.empty())
return;
///TODO: Allow iteration on Unicode characters without allocating any buffer
std::u32string characters = ToUtf32String(text);
if (characters.empty())
{
NazaraError("Invalid character set");
return;
}
const Font::SizeInfo& sizeInfo = m_font->GetSizeInfo(m_characterSize);
m_glyphs.reserve(m_glyphs.size() + characters.size() * ((m_outlineThickness > 0.f) ? 2 : 1));
for (char32_t character : characters)
IterateOnCodepoints(text, [&](const char32_t* characters, std::size_t characterCount)
{
for (std::size_t i = 0; i < characterCount; ++i)
{
char32_t character = characters[i];
if (m_previousCharacter != 0)
m_drawPos.x += m_font->GetKerning(m_characterSize, m_previousCharacter, character);
@ -279,6 +275,9 @@ namespace Nz
m_glyphs.push_back(glyph);
}
return true; //< continue iteration
});
m_bounds.ExtendTo(m_lines.back().bounds);
m_colorUpdated = true;