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add lossless quick encoding functions to the public API

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New functions:
   WebPEncodeLosslessRGB()
   WebPEncodeLosslessBGR()
   WebPEncodeLosslessRGBA()
   WebPEncodeLosslessBGRA()

Change-Id: Id56da7569eee80c57de8f1f053fb87b217d33a4b
This commit is contained in:
Pascal Massimino
2012-07-17 11:56:24 -07:00
parent 4c1f5d6435
commit c2416c9b61
3 changed files with 54 additions and 5 deletions
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14
README
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@@ -263,6 +263,20 @@ size_t WebPEncodeBGRA(const uint8_t* bgra, int width, int height, int stride,
They will convert raw RGB samples to a WebP data. The only control supplied
is the quality factor.
There are some variants for using the lossless format:
size_t WebPEncodeLosslessRGB(const uint8_t* rgb, int width, int height,
int stride, uint8_t** output);
size_t WebPEncodeLosslessBGR(const uint8_t* bgr, int width, int height,
int stride, uint8_t** output);
size_t WebPEncodeLosslessRGBA(const uint8_t* rgba, int width, int height,
int stride, uint8_t** output);
size_t WebPEncodeLosslessBGRA(const uint8_t* bgra, int width, int height,
int stride, uint8_t** output);
Of course in this case, no quality factor is needed since the compression
occurs without loss of the input values, at the expense of larger output sizes.
Advanced encoding API:
----------------------