2014/10/15 下午 10:16:05

iphone Programming Glossary: yield

http://stackoverflow.com/questions/12168072/fragment-shader-average-luminosity

hardware texture interpolation to average the four sets of four pixels then I just had to average those four pixels to yield a 16X reduction in pixels in a single step. I converted the image to luminance at the very first stage using a dot product.. quick iteration over the remaining few to arrive at the final luminosity value. For a 640x480 video frame this process yields a luminosity value in ~6 ms on an iPhone 4 and I think I can squeeze out a 1 2 ms reduction in that processing time with..

How to decrypt an encrypted Apple iTunes iPhone backup?

http://stackoverflow.com/questions/1498342/how-to-decrypt-an-encrypted-apple-itunes-iphone-backup

blob i 0 while i 8 len blob tag blob i i 4 length struct.unpack L blob i 4 i 8 0 data blob i 8 i 8 length yield tag data i 8 length def unpack64bit s return struct.unpack Q s 0 def pack64bit s return struct.pack Q s def AESUnwrap kek..

How to add a contact to the iPhone's Address Book from a Web Page?

http://stackoverflow.com/questions/1773876/how-to-add-a-contact-to-the-iphones-address-book-from-a-web-page

in Windows which whilst possible did not download correctly when linked from a webpage and certainly didn't yield the result I was after. So I decided to try using Apple software as after all we are trying to download onto an iPhone...

iPhone: how to get safari to recognize a vcard?

http://stackoverflow.com/questions/1892373/iphone-how-to-get-safari-to-recognize-a-vcard

Types in objective-c on iPhone

http://stackoverflow.com/questions/2107544/types-in-objective-c-on-iphone

NSLog @ ULLONG_MAX llu ULLONG_MAX unsigned long long int When run on an iPhone 3GS iPod Touch and older iPhones should yield the same result you get Primitive sizes The size of a char is 1. The size of short is 2. The size of int is 4. The size..

Making images appear… How?

http://stackoverflow.com/questions/2970293/making-images-appear-how

Boost.Thread threads not starting on the iPhone/iPad in release builds

http://stackoverflow.com/questions/4201262/boost-thread-threads-not-starting-on-the-iphone-ipad-in-release-builds

builds . Looking in the debugger the main thread sits in boost thread start_thread actually inside boost detail yield within boost detail spin_lock lock . The CPU isn't at 100 so it doesn't appear that the spin lock is starving the creation..

Leak - GeneralBlock-3584

http://stackoverflow.com/questions/478242/leak-generalblock-3584

. iphone cocoa touch memory leaks instruments share improve this question Leak detection tools can often yield false positives especially in underlying system libraries. I am familiar with these leaked GeneralBlocks and they didn't..

How to run and debug unit tests for an iPhone application

http://stackoverflow.com/questions/4989668/how-to-run-and-debug-unit-tests-for-an-iphone-application

by Sean Miceli on the Grokking Cocoa blog provides all the information to do this. Following it however did not yield immediate success and needed some tweaking. I will go over the main steps presented in Sean's tutorial providing some for..

How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation?

http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener

the colors and other values from that texture. This combination along with proper mipmapping for the texture seems to yield a ~10 performance boost. More importantly I now do a pass before rendering both my depth texture and the final raytraced.. some of the hardware optimizations within the PowerVR GPUs. In my benchmarks rendering the test model I used above yields times of 18 35 ms per frame as compared to the 35 68 ms I was getting previously a near doubling in rendering speed. Applying.. previously a near doubling in rendering speed. Applying this same opaque geometry pre rendering to the raytracing pass yields a doubling in overall rendering performance. Oddly when I tried to refine this further by using inset and circumscribed..

How to combine video clips with different orientation using AVFoundation

http://stackoverflow.com/questions/6575128/how-to-combine-video-clips-with-different-orientation-using-avfoundation

of the original before the video transforms. I have no clue why this happens...a different combination of videos will yield the expected result but sometimes its off. if you find out how to fix this PLEASE LET ME KNOW. share improve this answer..

NSDateFormatter dateFromString gives the wrong date

http://stackoverflow.com/questions/8186833/nsdateformatter-datefromstring-gives-the-wrong-date

year whereas YYYY specifies the year of Week of Year used in the ISO year week calendar. In most cases yyyy and YYYY yield the same number however they may be different. Typically you should use the calendar year. And to be correct you also have..