88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
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* Copyright 2017 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkWebpEncoder_DEFINED
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#define SkWebpEncoder_DEFINED
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkSpan.h" // IWYU pragma: keep
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#include "include/encode/SkEncoder.h"
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#include "include/private/base/SkAPI.h"
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class SkPixmap;
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class SkWStream;
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class SkData;
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class GrDirectContext;
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class SkImage;
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struct skcms_ICCProfile;
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namespace SkWebpEncoder {
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enum class Compression {
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kLossy,
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kLossless,
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};
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struct SK_API Options {
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/**
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* |fCompression| determines whether we will use webp lossy or lossless compression.
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*
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* |fQuality| must be in [0.0f, 100.0f].
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* If |fCompression| is kLossy, |fQuality| corresponds to the visual quality of the
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* encoding. Decreasing the quality will result in a smaller encoded image.
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* If |fCompression| is kLossless, |fQuality| corresponds to the amount of effort
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* put into the encoding. Lower values will compress faster into larger files,
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* while larger values will compress slower into smaller files.
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*
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* This scheme is designed to match the libwebp API.
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*/
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Compression fCompression = Compression::kLossy;
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float fQuality = 100.0f;
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};
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/**
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* Encode the |src| pixels to the |dst| stream.
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* |options| may be used to control the encoding behavior.
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*
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* Returns true on success. Returns false on an invalid or unsupported |src|.
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*/
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SK_API bool Encode(SkWStream* dst, const SkPixmap& src, const Options& options);
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/**
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* Returns the encoded data for the pixmap, or nullptr on failure.
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*/
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SK_API sk_sp<SkData> Encode(const SkPixmap& src, const Options& options);
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/**
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* Encode the provided image and return the resulting bytes. If the image was created as
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* a texture-backed image on a GPU context, that |ctx| must be provided so the pixels
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* can be read before being encoded. For raster-backed images, |ctx| can be nullptr.
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* |options| may be used to control the encoding behavior.
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*
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* Returns nullptr if the pixels could not be read or encoding otherwise fails.
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*/
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SK_API sk_sp<SkData> Encode(GrDirectContext* ctx, const SkImage* img, const Options& options);
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/**
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* Encode the |src| frames to the |dst| stream.
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* |options| may be used to control the encoding behavior.
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*
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* The size of the first frame will be used as the canvas size. If any other frame does
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* not match the canvas size, this is an error.
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*
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* Returns true on success. Returns false on an invalid or unsupported |src|.
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*
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* Note: libwebp API also supports set background color, loop limit and customize
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* lossy/lossless for each frame. These could be added later as needed.
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*/
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SK_API bool EncodeAnimated(SkWStream* dst,
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SkSpan<const SkEncoder::Frame> src,
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const Options& options);
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} // namespace SkWebpEncoder
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#endif
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