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Eliminated memory allocations in Keyboard events

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This commit is contained in:
Stefanos A 2013-12-09 23:44:51 +01:00
parent 537a2f7b89
commit 128d96994b
1 changed files with 45 additions and 25 deletions
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70
Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs
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@ -59,6 +59,16 @@ namespace OpenTK.Platform.SDL2
Icon icon;
string window_title;
// Used in KeyPress event to decode SDL UTF8 text strings
// to .Net UTF16 strings
char[] DecodeTextBuffer = new char[32];
// Argument for KeyPress event (allocated once to avoid runtime allocations)
readonly KeyPressEventArgs keypress_args = new KeyPressEventArgs('\0');
// Argument for KeyDown and KeyUp events (allocated once to avoid runtime allocations)
readonly KeyboardKeyEventArgs key_args = new KeyboardKeyEventArgs();
readonly IInputDriver input_driver = new Sdl2InputDriver();
readonly EventFilter EventFilterDelegate_GCUnsafe = FilterEvents;
@ -226,39 +236,49 @@ namespace OpenTK.Platform.SDL2
{
bool key_pressed = ev.Key.State == State.Pressed;
var key = ev.Key.Keysym;
var args = new KeyboardKeyEventArgs()
{
Key = TranslateKey(key.Scancode),
ScanCode = (uint)key.Scancode
};
window.key_args.Key = TranslateKey(key.Scancode);
window.key_args.ScanCode = (uint)key.Scancode;
if (key_pressed)
window.KeyDown(window, args);
{
window.KeyDown(window, window.key_args);
}
else
window.KeyUp(window, args);
{
window.KeyUp(window, window.key_args);
}
//window.keyboard.SetKey(TranslateKey(key.scancode), (uint)key.scancode, key_pressed);
}
static unsafe void ProcessTextInputEvent(Sdl2NativeWindow window, TextInputEvent ev)
{
var keyPress = window.KeyPress;
if (keyPress != null)
// Calculate the length of the typed text string
int length;
for (length = 0; length < TextInputEvent.TextSize && ev.Text[length] != '\0'; length++)
;
// Make sure we have enough space to decode this string
int decoded_length = Encoding.UTF8.GetCharCount(ev.Text, length);
if (window.DecodeTextBuffer.Length < decoded_length)
{
var length = 0;
byte* pText = ev.Text;
while (*pText != 0)
{
length++;
pText++;
}
using (var stream = new System.IO.UnmanagedMemoryStream(ev.Text, length))
using (var reader = new System.IO.StreamReader(stream, Encoding.UTF8))
{
var text = reader.ReadToEnd();
foreach (var c in text)
{
keyPress(window, new KeyPressEventArgs(c));
}
}
Array.Resize(
ref window.DecodeTextBuffer,
2 * Math.Max(decoded_length, window.DecodeTextBuffer.Length));
}
// Decode the string from UTF8 to .Net UTF16
fixed (char* pBuffer = window.DecodeTextBuffer)
{
decoded_length = System.Text.Encoding.UTF8.GetChars(
ev.Text,
length,
pBuffer,
window.DecodeTextBuffer.Length);
}
for (int i = 0; i < decoded_length; i++)
{
window.keypress_args.KeyChar = window.DecodeTextBuffer[i];
window.KeyPress(window, window.keypress_args);
}
}