taylorza

Filling an array or slice with a repeated pattern

Looking for an efficient pure GO approach to copy repeating patterns into a slice, for a toy project, I ran a few tests and discovered a neat approach to significantly improve performance. For the toy project, I am using this to fill a background buffer with a specific RGB color pattern, so improving this performance significantly improved my acheivable framerate.

All the test were run with a buffer of 73437 bytes, allocated as follows

var bigSlice = make([]byte, 73437, 73437)

Fill the slice with the value 65 by looping through each element and setting the value

NaniteFactory

import (
	"syscall"
	"unsafe"
)

// MessageBox of Win32 API.
func MessageBox(hwnd uintptr, caption, title string, flags uint) int {
	ret, _, _ := syscall.NewLazyDLL("user32.dll").NewProc("MessageBoxW").Call(
		uintptr(hwnd),
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(caption))),

stefangordon

var styles = StyleSheet.create({
  backgroundVideo: {
    width:400,
    height:322
  }
})

return (
      <View>       
       <WebView

chomi3

/*
Copyright 2015 Michal Pawlowski

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

meoyawn

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class EmptyRecyclerView extends RecyclerView {
  @Nullable View emptyView;

gabrielemariotti

        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
        
        //Title and subtitle
        toolbar.setTitle("MY toolbar");
        toolbar.setSubtitle("Subtitle");

        //Menu
        toolbar.inflateMenu(R.menu.toolbar_menu);

        toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {

methodin

/*
Original code found at:
https://code.google.com/p/android-stocker/source/browse/trunk/src/com/twofuse/stocker/Rotate3dAnimation.java?r=2

Use (in set):
Rotate3dAnimation skew = new Rotate3dAnimation(20, 0, 0, 0, 0, 0);
set.addAnimation(skew);

animation = new TranslateAnimation(0, 0, 0, 0, Animation.RELATIVE_TO_SELF, 0.5f, 0, 0);
set.addAnimation(animation);

jcxplorer

function uuid() {
  var uuid = "", i, random;
  for (i = 0; i < 32; i++) {
    random = Math.random() * 16 | 0;

    if (i == 8 || i == 12 || i == 16 || i == 20) {
      uuid += "-"
    }
    uuid += (i == 12 ? 4 : (i == 16 ? (random & 3 | 8) : random)).toString(16);
  }