Uses WebPToSDL() generic function defined in vwebp_sdl.[ch].
This function is not included in the libextras library, because it
would bring in an SDL dependency. Probably too heavy for now.
WebPToSDL() is separate, because it will be called used by the javascript
version of libwebp (through emscripten build rules)
Change-Id: Ic85b36f8ce4784f46023656278f6480be6802834
remove libimagedec from webp_quality, only the webp headers are
inspected. libwebpextras isn't needed by get_disto.
Change-Id: Ib85f97e2c4a9edd97392fd20ef294d1ccc76dda5
Roughly, if both the source and the reference areas are
darker too dark (R/G/B <= ~6), they are ignored.
One caveat: SSIM calculation won't work for U/V planes,
which are 128-centered and not related to luminance.
But WebPPlaneDistortion() enforces the conversion to RGB,
if needed.
Change-Id: I586c2579c475583b8c90c5baefd766b1d5aea591
* prevent 64bit overflow by controlling the 32b->64b conversions
and preventively descaling by 8bit before the final multiply
* adjust the threshold constants C1 and C2 to de-emphasis the dark
areas
* use a hat-like filter instead of box-filtering to avoid blockiness
during averaging
SSIM distortion calc is actually *faster* now in SSE2, because of the
unrolling during the function rewrite.
The C-version is quite slower because still un-optimized.
Change-Id: I96e2715827f79d26faae354cc28c7406c6800c90
using -ssim -o will trigger SSIM map calculation instead of add-diff map.
-gray converts the error map to intensity instead of having each channels' error separated.
Change-Id: I4bdb88880a252e5562aa4e0e3c2353ad93aef20e
This function returns a rough estimation of the quality factor used
for compressing the WebP bitstream.
Simple command line: 'webp_quality [-quiet] in.webp'
should print the estimated quality factor.
Change-Id: Ifba3e489461f5a587003ac9f08cc7556e9b24ac2
reserve src/ for the code of the main libraries: libwebp, libwebpdemux
and libwebpmux
+ demote this library to internal only; i.e., don't install the header +
lib with make install
Change-Id: I8c9844db8f494be0fa0a2549a5b75b5cebcf666d
