Flash 的時代終將過去︰

Adobe Flash Player

Adobe Flash Player（在Internet Explorer和Firefox被稱為Shockwave Flash）^[2]是一種廣泛使用的、專有的多媒體程式播放器。它最初由Macromedia編寫，在Macromedia被Adobe收購後由Adobe繼續開發。

Flash Player使用的SWF檔案可由Adobe Animate、Adobe Flex或者其他軟體或第三方工具建立。Adobe Animate簡稱Flash，同時表示創作程式和播放器。它同時使用點陣圖和向量圖形，利用ActionScript手 稿語言進行編程，支援雙向影片流和音訊流。嚴格來說，Adobe Flash是創作環境而Flash Player是執行Flash檔案的虛擬機器。但是，通常二者均可稱為Flash，即Flash同時有三種含義：創作環境，播放器和程式檔案。Flash Player支援內嵌的手稿語言ActionScript（AS）。ActionScript是一種基於ECMAScript的手稿語言，可用於編寫Adobe Flash動畫和應用程式。由於ActionScript和JavaScript都是基於ECMAScript語法的，理論上它們互相可以很流暢地從一種語言翻譯到另一種。Adobe Flash Player最初設計目的為播放二維向量動量，但至此之後成為適合開發創造豐富型網際網路應用程式、串流視訊音訊的工具。Flash Player使用向量圖形的技術來最小化檔案的大小以及創造節省網路頻寬和下載時間的檔案。因此Flash成為嵌入網頁中的小遊戲、動畫、廣告、以及圖形使用者介面常用的格式。

因Flash的諸多限制和資訊安全問題，合作夥伴包括Apple、Facebook、Google、微軟及Mozilla等合作下棄用 Flash 預載，以及HTML5的興起，Flash Player的使用逐年下滑。 Adobe於2017年7月25日宣布於2020年12月30日停止更新和發行Flash Player。^[3]

 

進入 HTML5 之紀元也︰

HTML5test

HTML5test is a web application for evaluating a web browser‘s accuracy in implementing the web standards HTML5 and Web SQL Database (developed by the World Wide Web Consortium), as well as the WebGL standard (developed by the Mozilla Foundation and the Khronos Group).^[2]

The test suite was developed by Dutch web programmer Niels Leenheer, and published in March 2010.^[3] To test a web browser, the user must visit the home page of the website html5test.com.^[4] The application returns an integer score out of a possible 555 points. The point total has changed multiple times through the evolution of the software; Leenheer introduced the present scoring system as part of a major redesign of the test introduced in November 2013.^[5]

HTML5test evaluates the browser’s support for Web storage, the W3C Geolocation API, HTML5-specific HTML elements (including the canvas element), and other features.^[6][7] It does not evaluate a browser’s conformance to other web standards, such as Cascading Style Sheets, ECMAScript, Scalable Vector Graphics, or the Document Object Model. Conformance testing for those standards is within the purview of Acid3, an automated test published by Ian Hickson in 2008.^[8] Similarly, Acid3 does not evaluate a browser’s HTML5 conformance. The test scope of HTML5test and the test scope of Acid3 are mutually exclusive.

 

目前 樹莓派上使用的 Chrome Dev 60.0.3112.89 版本瀏覽器，得分還頗高的哩︰

 

預設為不開啟 flash ︰

pi@raspberrypi:~  ls libpepflashplayer.so -l
-rw-r--r-- 1 root root 20458984 10月 21 05:36 libpepflashplayer.so
pi@raspberrypi:/usr/lib/chromium-browser $

 

眼下論壇所講

 

chrome:plugins 查詢設定方法，恐發生如下之錯誤訊息︰

 

據谷歌

 

 

 

 

……

【怎麼會發生回歸錯誤？】

當一個軟體『變大』『變複雜』的時候，即使好好的『測試』，也難保沒有『錯誤』。以致針對『已知的』臭蟲必須『除錯』。只是除錯這一件事遠比想像的『困難』，常常『改好了這個』卻又『發生了那個』。又有時『修正新錯誤』反而使得『原先沒問題』的倒是『產生了狀況』，這種情形就叫做『回 歸錯誤』Regression Fail！！玩新版 B+ 如果遇到這事，不要覺的奇怪！！

─── 《媒體中心──行事》

 

回顧三年前樹莓派革故 B 鼎新 B+ 之時，也曾遭遇回歸性錯誤！不知今日論壇上何事劍拔弩張？

……

Re: Mesa driver much slower on Stretch than on Jessie

jamesh

Tue Sep 05, 2017 2:33 pm

 

當此鼎革革鼎之際，莫若面對問題︰

Re: Mesa driver much slower on Stretch than on Jessie

mikerr

Tue Oct 03, 2017 1:53 pm

glxgears -info
123 frames in 5.0 seconds = 24.481 FPS

edit /etc/apt/sources.list to add this at the end:

deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi

now revert to the jessie version:

sudo apt-get update
sudo apt-get install libgl1-mesa-dri=10.3.2-1+deb8u1
sudo apt-mark hold libgl1-mesa-dri

this DOUBLES the framerate of glxgears from 24 fps to 53 fps on my pi2 (and corrects the colours too)

glxgears -info
269 frames in 5.0 seconds = 53.790 FPS

[edit]
if you want to return to the most recent (slow) version for any reason, do this:

sudo apt-mark unhold libgl1-mesa-dri
sudo apt-get upgrade

 

嘗試釐清原由︰

pi@raspberrypi:~  

 

或許可見曙光︰

 

 

 

知道方向︰

pi@raspberrypi:~  

 

踏出關鍵一步耶☆

Developers

Dispatch Table

OpenGL ES has an additional indirection when dispatching functions

Mesa: glFoo() –> _mesa_Foo()
OpenGL ES: glFoo() –> _es_Foo() –> _mesa_Foo()

The indirection serves several purposes

• When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.
• When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.
• When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.

Other than the last case, OpenGL ES uses APIspec.xml to generate functions to check and/or converts the arguments.

 

 

您在所有發行版中所有硬體架構下所有區域里，指定關鍵字 libgl1-mesa-dri 在套件名稱中搜尋的結果。 找到 5 個匹配的套件。

完整匹配

套件 libgl1-mesa-dri

• wheezy (oldoldstable) (libs): free implementation of the OpenGL API — DRI modules
  8.0.5-4+deb7u2: amd64 armel armhf i386 ia64 kfreebsd-amd64 kfreebsd-i386 mips mipsel powerpc s390 s390x sparc
• jessie (oldstable) (libs): free implementation of the OpenGL API — DRI modules
  10.3.2-1+deb8u1: amd64 arm64 armel armhf i386 mips mipsel powerpc ppc64el s390x
• jessie-backports (libs): free implementation of the OpenGL API — DRI modules
  13.0.6-1~bpo8+1: amd64 arm64 armel armhf i386 mips mipsel powerpc ppc64el s390x
• stretch (stable) (libs): free implementation of the OpenGL API — DRI modules
  13.0.6-1+b2: amd64 arm64 armel armhf i386 mips mips64el mipsel ppc64el s390x
• buster (testing) (libs): free implementation of the OpenGL API — DRI modules
  17.2.3-1: amd64 arm64 armel armhf i386 mips mips64el mipsel ppc64el s390x
• sid (unstable) (libs): free implementation of the OpenGL API — DRI modules
  17.2.4-1: alpha amd64 arm64 armel armhf hppa i386 m68k mips mips64el mipsel powerpc powerpcspe ppc64 ppc64el s390x sparc64 x32
  13.0.6-1: hurd-i386
  12.0.4-2: kfreebsd-amd64 kfreebsd-i386
  11.2.2-1 [debports]: sh4
• experimental (rc-buggy) (libs): free implementation of the OpenGL API — DRI modules
  17.3.0~rc2-1: amd64 arm64 armel armhf hppa i386 m68k mips powerpc ppc64 ppc64el s390x sparc64

 

 

 

 

 

 

 

 

新舊交接時期終究事多，樹莓派論壇有人談起︰

Mesa driver much slower on Stretch than on Jessie

RichardRussell

Sat Aug 26, 2017 4:32 pm

 

驗之，真的也︰

 

 

 

pi@raspberrypi:~ 

 

GitHub 上有人建議︰

OpenGL performance reduced on Raspbian Stretch #79

XECDesign commented on Sep 4

After a bit of testing, it does look like this is an issue which affects software OpenGL rendering in general, not just glxgears. However, the change of behaviour comes from upstream Debian packages and software opengl rendering is not something we’ve ever touched or claimed to support. I would recommend enabling vc4 fkms in raspi-config for proper OpenGL support.

 

證之，果然矣︰

 

 

 

pi@raspberrypi:~ 

 

然而目前樹莓派 G1 GL

 

還很挑 HDMI 顯示器才開機哩！故置疑焉？

 

 

 

 

 

 

 

 

 

幸而一會兒 pip3 安裝回復了正常？【※ 果真網路因素耶？？】得以安裝 ColorPy 驗證測試︰

pi@raspberrypi:~  xprop -display :0.0 -len 14 -root _ICC_PROFILE
_ICC_PROFILE:  no such atom on any window.
pi@raspberrypi:~  apt-cache search xiccd
xiccd - X color management daemon
pi@raspberrypi:~ $

 

且玩玩 xcalib 哩◎

XCALIB(1) xcalib XCALIB(1)

NAME
xcalib – Tiny monitor calibration loader for Xorg.

SYNOPSIS
xcalib [-options] ICCPROFILE

DESCRIPTION
xcalib loads ‘vcgt’-tag of ICC profiles to the X-server using the XVid‐
Mode Extension in order to calibrate your display.

OPTIONS
-d, -display <host:dpy>

-s, -screen <screen-#>

-c, -clear

-n, -noaction

-v, -verbose

 

 

 

 

 

 

 

 

因 9VA-pi 選單

 

之灰階對比令人疑惑︰

想要理解什麼是『灰色』其實並不容易！？

Grey

Grey (British English) or gray (American English;^{[citation needed]} see spelling differences) is an intermediate color between black and white. It is a neutral or achromatic color, meaning literally that it is a color “without color.”^[2] This means that there are equal components of red, green, and blue. The variations in intensity of these colors uniformly produce different shades of grey. It is the color of a cloud-covered sky, of ash and of lead.^[3]

The first recorded use of grey as a color name in the English language was in AD 700.^[4] Grey is the dominant spelling in European and Commonwealth English, although gray remained in common usage in the UK until the second half of the 20th century.^[5] Gray has been the preferred American spelling since approximately 1825,^[6] although grey is an accepted variant.^[7][8]

In Europe and the United States, surveys show that grey is the color most commonly associated with neutrality, conformity, boredom, uncertainty, old age, indifference, and modesty. Only one percent of respondents chose it as their favorite color.^[9]

 

因為『純灰』指稱沒有『色相』 HUE 之『顏色』也◎

─ 摘自《GoPiGo 小汽車︰格點圖像算術《色彩空間》灰階‧乙》

 

知其恐非以 sRGB 為預設︰

edidparser edid.dat

Enabling fuzzy format match…
Parsing edid.dat…
HDMI:EDID version 1.3, 1 extensions, screen size 70×39 cm
HDMI:EDID features – videodef 0x80 standby suspend active off; colour encoding:RGB444|YCbCr422; sRGB is not default colourspace; preferred format is native; does not support GTF

 

故想安裝

Mark Kness 先生寫作『顏色派』

ColorPy

Physical color calculations in Python.

More documentation is currently at http://markkness.net/colorpy/ColorPy.html.

A taste of the plots that ColorPy can create: RGB values for the pure spectral lines.

Version 0.1.1. Changes from 0.1.0: Various things I did on my local machine. A better shark fin plot, for example. Now on GitHub!

Version 0.1.0. I had this hosted at http://markkness.net (and still do) but GitHub is a better place for it now.

這時仍喜派生二 Python2 。簡單準備環境後︰

sudo pip install scipy
sudo pip3 install scipy

sudo pip install numpy
sudo pip3 install numpy

sudo apt-get install python-matplotlib python3-matplotlib
sudo apt-get install python-zmq python3-zmq

sudo apt-get install ipython ipython3

─── 摘自《GoPiGo 小汽車︰格點圖像算術《彩色世界》【顏色ABC】二》

 

驗證與查核後，看如何在 Raspbian Stretch 裡產合宜的

ICC profile

In color management, an ICC profile is a set of data that characterizes a color input or output device, or a color space, according to standards promulgated by the International Color Consortium (ICC). Profiles describe the color attributes of a particular device or viewing requirement by defining a mapping between the device source or target color space and a profile connection space (PCS). This PCS is either CIELAB (L*a*b*) or CIEXYZ. Mappings may be specified using tables, to which interpolation is applied, or through a series of parameters for transformations.

Every device that captures or displays color can be profiled. Some manufacturers provide profiles for their products, and there are several products that allow an end-user to generate his or her own color profiles, typically through the use of a tristimulus colorimeter or preferably a spectrophotometer.

The ICC defines the format precisely but does not define algorithms or processing details. This means there is room for variation between different applications and systems that work with ICC profiles. Since late 2010, the current version of the specification is 4.3.^[1]

ICC has also published a preliminary specification for iccMAX, a next-generation color management architecture with significantly expanded functionality and a choice of colorimetric, spectral or material connection space. Details are at http://www.color.org/iccmax/

 

呦？莫非萬聖奔騰之夜剛過，所以遭遇

pip fails with “TypeError: unsupported operand type(s) for -=: ‘Retry’ and ‘int'” #4779

• Pip version: python-pip (9.0.1-2+rpt1)
• Python version: 2.7
• Operating system: Linux

Description:

pip is trying to install rsa<=3.5.0,>=3.1.2 (from awscli), and randomly fails with this error:
TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'. By random, I mean it works about 80% of the time, fails about 20%, and I don’t why it fails.

I don’t speak python, so I think it’s pip that’s failing, and not something in the rsa module as it’s being installed.

 

事件耶？？谷歌後發現當時半信半疑的舊聞

Python PIP Install throws TypeError: unsupported operand type(s) for -=: ‘Retry’ and ‘int’

TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'

 

。且先用備份系統確認，竟然 OK 哩！！不得已一時岔路乎？？