940c3f136d
If we want to make these external dependencies mix-and-match in Google3, we'll need to group together the encoders and decoders, everything that dependends on each external library. I was tempted to try to remove these generic encoder entrypoints and replace them with calls to the direct equivalents, but I'm not sure that's necessary. I think we can just register encoders like decoders. Change-Id: I41d2d1bb3ceb1daafa62c95d345eb6a70249be75 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213880 Commit-Queue: Mike Klein <mtklein@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
/*
|
|
* Copyright 2017 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkWebpEncoder_DEFINED
|
|
#define SkWebpEncoder_DEFINED
|
|
|
|
#include "include/encode/SkEncoder.h"
|
|
|
|
class SkWStream;
|
|
|
|
namespace SkWebpEncoder {
|
|
|
|
enum class Compression {
|
|
kLossy,
|
|
kLossless,
|
|
};
|
|
|
|
struct SK_API Options {
|
|
/**
|
|
* |fCompression| determines whether we will use webp lossy or lossless compression.
|
|
*
|
|
* |fQuality| must be in [0.0f, 100.0f].
|
|
* If |fCompression| is kLossy, |fQuality| corresponds to the visual quality of the
|
|
* encoding. Decreasing the quality will result in a smaller encoded image.
|
|
* If |fCompression| is kLossless, |fQuality| corresponds to the amount of effort
|
|
* put into the encoding. Lower values will compress faster into larger files,
|
|
* while larger values will compress slower into smaller files.
|
|
*
|
|
* This scheme is designed to match the libwebp API.
|
|
*/
|
|
Compression fCompression = Compression::kLossy;
|
|
float fQuality = 100.0f;
|
|
};
|
|
|
|
/**
|
|
* Encode the |src| pixels to the |dst| stream.
|
|
* |options| may be used to control the encoding behavior.
|
|
*
|
|
* Returns true on success. Returns false on an invalid or unsupported |src|.
|
|
*/
|
|
SK_API bool Encode(SkWStream* dst, const SkPixmap& src, const Options& options);
|
|
|
|
inline bool Encode(SkWStream* dst, const SkPixmap& src, int quality) {
|
|
SkWebpEncoder::Options opts;
|
|
if (quality == 100) {
|
|
// fQuality acts as a signal for how much time to invest encoding a smaller file.
|
|
// This value matches blink::ImageEncoder::ComputeWebpOptions and WebPConfigInit.
|
|
opts.fQuality = 75;
|
|
opts.fCompression = SkWebpEncoder::Compression::kLossless;
|
|
} else {
|
|
opts.fQuality = quality;
|
|
opts.fCompression = SkWebpEncoder::Compression::kLossy;
|
|
}
|
|
return SkWebpEncoder::Encode(dst, src, opts);
|
|
}
|
|
}
|
|
|
|
#endif
|