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ImGuiTextBuffer: Avoid heap allocation when empty.

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omar
2018-10-10 17:02:14 +02:00
parent 1efafa1d29
commit d02b11dfbd
3 changed files with 18 additions and 12 deletions
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24
imgui.h
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@ -1366,25 +1366,27 @@ struct ImGuiTextFilter
int CountGrep;
};
// Helper: Text buffer for logging/accumulating text
// Helper: Growable text buffer for logging/accumulating text
// (this could be called 'ImGuiTextBuilder' / 'ImGuiStringBuilder')
struct ImGuiTextBuffer
{
ImVector<char> Buf;
static char EmptyString[1];
ImGuiTextBuffer() { Buf.push_back(0); }
inline char operator[](int i) { return Buf.Data[i]; }
const char* begin() const { return &Buf.front(); }
const char* end() const { return &Buf.back(); } // Buf is zero-terminated, so end() will point on the zero-terminator
int size() const { return Buf.Size - 1; }
bool empty() { return Buf.Size <= 1; }
void clear() { Buf.clear(); Buf.push_back(0); }
void reserve(int capacity) { Buf.reserve(capacity); }
const char* c_str() const { return Buf.Data; }
ImGuiTextBuffer() { }
inline char operator[](int i) { IM_ASSERT(Buf.Data != NULL); return Buf.Data[i]; }
const char* begin() const { return Buf.Data ? &Buf.front() : EmptyString; }
const char* end() const { return Buf.Data ? &Buf.back() : EmptyString; } // Buf is zero-terminated, so end() will point on the zero-terminator
int size() const { return Buf.Data ? Buf.Size - 1 : 0; }
bool empty() { return Buf.Size <= 1; }
void clear() { Buf.clear(); }
void reserve(int capacity) { Buf.reserve(capacity); }
const char* c_str() const { return Buf.Data ? Buf.Data : EmptyString; }
IMGUI_API void appendf(const char* fmt, ...) IM_FMTARGS(2);
IMGUI_API void appendfv(const char* fmt, va_list args) IM_FMTLIST(2);
};
// Helper: key->value storage
// Helper: Key->Value storage
// Typically you don't have to worry about this since a storage is held within each Window.
// We use it to e.g. store collapse state for a tree (Int 0/1)
// This is optimized for efficient lookup (dichotomy into a contiguous buffer) and rare insertion (typically tied to user interactions aka max once a frame)