kmx git

Show log
Commit
Hash : d2a2b0c1
Author :
Date : 2017-10-07T15:26:55

Fixed bug 3857 - SDL_ConvertPixels misses YUV conversions Sylvain There are various YUV-RGB conversion coefficients, according to https://www.fourcc.org/fccyvrgb.php I choose the first (from Video Demystified, with integer multiplication), but the current SDL2 Dither functions use in fact the next one, which follows a specifications called CCIR 601. Here's a patch to use the second ones and with previous warning corrections. There are less multiplications involved because Chroma coefficient is 1. Also, doing float multiplication is as efficient with vectorization. In the end, the YUV decoding is faster: ~165 ms vs my previous 195 ms. Moreover, if SDL2 is compiled with -march=native, then YUV decoding time drops to ~130ms, while older ones remains around ~220 ms. For information, from jpeg-9 source code: jpeg-9/jccolor.c * YCbCr is defined per CCIR 601-1, except that Cb and Cr are * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. * The conversion equations to be implemented are therefore * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE jpeg-9/jdcolor.c * YCbCr is defined per CCIR 601-1, except that Cb and Cr are * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5. * The conversion equations to be implemented are therefore * * R = Y + 1.40200 * Cr * G = Y - 0.34414 * Cb - 0.71414 * Cr * B = Y + 1.77200 * Cb

Properties

Git HTTP	https://git.kmx.io/kc3-lang/SDL.git
Git SSH	git@git.kmx.io:kc3-lang/SDL.git
Public access ?	public
Description	Fork of https://github.com/libsdl-org/SDL
Users
Tags

kc3-lang/SDL/src/video

Commit

Files

Properties