idiottiger

;;;中文与英文字体设置
;; Setting English Font
(set-face-attribute
'default nil :font "Monaco 14")
;; Chinese Font
(dolist (charset '(kana han symbol cjk-misc bopomofo))
(set-fontset-font (frame-parameter nil 'font)
charset
(font-spec :family "WenQuanYi Micro Hei Mono" :size 16)))

idiottiger

import re
import codecs
import tempfile

METHOD_PATTERN = re.compile('\s*[^/]+\s*(public|private|protected)\s+[^class]\s*[a-zA-Z][a-zA-Z0-9_]*\s+[a-zA-Z][a-zA-Z0-9_]*\s*\(')
JS_METHOD_PATTERN = re.compile('\s*[^/]+\s*public\s+[^class]\s*[a-zA-Z][a-zA-Z0-9_]*\s+[a-zA-Z][a-zA-Z0-9_]*\s*\(')
JS_INTERFACE_PATTERN = re.compile('\s*@JavascriptInterface')
JS_ANNOTATION = '\t@JavascriptInterface\n'
JS_ANNOTATION_CLASS_NAME = 'android.webkit.JavascriptInterface'
JS_ANNOTATION_IMP = 'import android.webkit.JavascriptInterface;\n'

idiottiger

In software engineering, the Initialization on Demand Holder (design pattern) idiom is a lazy-loaded singleton.
In all versions of Java, the idiom enables a safe, highly concurrent lazy initialization with good performance.

public class Something {
    private Something() {}
 
    private static class LazyHolder {
        private static final Something INSTANCE = new Something();
    }
 

idiottiger

Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
访问一级缓存
Branch mispredict                             5   ns
分支误预测
L2 cache reference                            7   ns             14x L1 cache
访问二级缓存
Mutex lock/unlock                            25   ns
互斥锁 加锁/解锁

idiottiger

Android Utility Function Library
================================


If you need a feature that is native to Linux but not present on other
platforms, construct a platform-dependent implementation that shares
the Linux interface.  That way the actual device runs as "light" as
possible.

If that isn't feasible, create a system-independent interface and hide

idiottiger

git 常用命令：
---------------------------------------

1. tag：
-------------------------
git tag 列出所有tag
git tag -a [tag-name] -m [tag-description] 创建 tag
git show [tag-name] 显示该 tag 的信息
git push origin [local-tag-name] 推送本地 tag 到远程
git push origin --tags 推送本地所有 tag 到远程

idiottiger

;;1.3 Define a procedure that takes three numbers as arguments and returns the sum of the squares of the two larger numbers.
(define (sq x)(* x x))
(define (f2 x y)(if (< x y) x y))
(define (f3 x y z)(f2 (f2 x y) (f2 y z)))
(define (sum_3 x y z)(- (+ (sq x) (sq y) (sq z)) (sq(f3 x y z))))

;;1.4 implemenets:
;;   (define (a-plus-abs-b a b)
;;   ((if (> b 0) + -) a b))

idiottiger

Create a file named /tmp/android.rules with the following contents (hex vendor numbers were taken from the vendor list page):


SUBSYSTEM=="usb", ATTRS{idVendor}=="0bb4", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0e79", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0502", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0b05", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="413c", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0489", MODE="0666", GROUP="plugdev"
SUBSYSTEM=="usb", ATTRS{idVendor}=="091e", MODE="0666", GROUP="plugdev"

idiottiger

// test the gist file show in the blogspot

#include <stdio.h>

int main(){
    println("hello world");
    exit(0);
}

idiottiger

open cv android 学习：
------------------------------------------------------------------
1.基本数据结构： java name -> c/c++ name
  Point Point3 -> CvPoint, CvPoint2D32f, CvPoint3D32f
  Size -> CvSize, CvSize2D32f
  Rect -> CvRect
  Scalar -> CvScalar  数据容器，最多可保存4个double值
  TermCriteria -> CvTermCriteria ??
  Mat -> CvMat 单通道或者多通道矩阵
  Imgproc 图像处理函数类