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add a decoding option to flip image vertically

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New API options: WebPDecoderOptions.flip and 'dwebp -flip ...'

it uses negative stride trick.

Also changed the decoder code to support user-supplied
buffers with negative stride, independently of the
WebPDecoderOptions.flip value.

Change-Id: I4dc0d06f0c87e51a3f3428be4fee2d6b5ad76053
This commit is contained in:
skal
2014-01-16 15:48:43 +01:00
parent 00c3c4e114
commit 5da185522b
8 changed files with 99 additions and 37 deletions
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15
README
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@ -262,19 +262,20 @@ Use following options to convert into alternate image formats:
-yuv ......... save the raw YUV samples in flat layout
Other options are:
-version .... print version number and exit.
-nofancy ..... don't use the fancy YUV420 upscaler.
-nofilter .... disable in-loop filtering.
-nodither .... disable dithering.
-version .... print version number and exit
-nofancy ..... don't use the fancy YUV420 upscaler
-nofilter .... disable in-loop filtering
-nodither .... disable dithering
-dither <d> .. dithering strength (in 0..100)
-mt .......... use multi-threading
-crop <x> <y> <w> <h> ... crop output with the given rectangle
-scale <w> <h> .......... scale the output (*after* any cropping)
-alpha ....... only save the alpha plane.
-flip ........ flip the output vertically
-alpha ....... only save the alpha plane
-incremental . use incremental decoding (useful for tests)
-h ....... this help message.
-h ....... this help message
-v ....... verbose (e.g. print encoding/decoding times)
-noasm ....... disable all assembly optimizations.
-noasm ....... disable all assembly optimizations
Visualization tool:
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