1 /* 2 * Copyright 2017 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkWebpEncoder_DEFINED 9 #define SkWebpEncoder_DEFINED 10 11 #include "SkEncoder.h" 12 13 class SkWStream; 14 15 namespace SkWebpEncoder { 16 17 enum class Compression { 18 kLossy, 19 kLossless, 20 }; 21 22 struct SK_API Options { 23 /** 24 * |fCompression| determines whether we will use webp lossy or lossless compression. 25 * 26 * |fQuality| must be in [0.0f, 100.0f]. 27 * If |fCompression| is kLossy, |fQuality| corresponds to the visual quality of the 28 * encoding. Decreasing the quality will result in a smaller encoded image. 29 * If |fCompression| is kLossless, |fQuality| corresponds to the amount of effort 30 * put into the encoding. Lower values will compress faster into larger files, 31 * while larger values will compress slower into smaller files. 32 * 33 * This scheme is designed to match the libwebp API. 34 */ 35 Compression fCompression = Compression::kLossy; 36 float fQuality = 100.0f; 37 38 /** 39 * If the input is premultiplied, this controls the unpremultiplication behavior. 40 * The encoder can convert to linear before unpremultiplying or ignore the transfer 41 * function and unpremultiply the input as is. 42 */ 43 SkTransferFunctionBehavior fUnpremulBehavior = SkTransferFunctionBehavior::kRespect; 44 }; 45 46 /** 47 * Encode the |src| pixels to the |dst| stream. 48 * |options| may be used to control the encoding behavior. 49 * 50 * Returns true on success. Returns false on an invalid or unsupported |src|. 51 */ 52 SK_API bool Encode(SkWStream* dst, const SkPixmap& src, const Options& options); 53 }; 54 55 #endif 56
