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| -rw-r--r-- | media/libwebp/src/enc/vp8li_enc.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/media/libwebp/src/enc/vp8li_enc.h b/media/libwebp/src/enc/vp8li_enc.h new file mode 100644 index 0000000000..3d35e1612d --- /dev/null +++ b/media/libwebp/src/enc/vp8li_enc.h @@ -0,0 +1,126 @@ +// Copyright 2012 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Lossless encoder: internal header. +// +// Author: Vikas Arora (vikaas.arora@gmail.com) + +#ifndef WEBP_ENC_VP8LI_ENC_H_ +#define WEBP_ENC_VP8LI_ENC_H_ + +#ifdef HAVE_CONFIG_H +#include "src/webp/config.h" +#endif +// Either WEBP_NEAR_LOSSLESS is defined as 0 in config.h when compiling to +// disable near-lossless, or it is enabled by default. +#ifndef WEBP_NEAR_LOSSLESS +#define WEBP_NEAR_LOSSLESS 1 +#endif + +#include "src/enc/backward_references_enc.h" +#include "src/enc/histogram_enc.h" +#include "src/utils/bit_writer_utils.h" +#include "src/webp/encode.h" +#include "src/webp/format_constants.h" + +#ifdef __cplusplus +extern "C" { +#endif + +// maximum value of transform_bits_ in VP8LEncoder. +#define MAX_TRANSFORM_BITS 6 + +typedef enum { + kEncoderNone = 0, + kEncoderARGB, + kEncoderNearLossless, + kEncoderPalette +} VP8LEncoderARGBContent; + +typedef struct { + const WebPConfig* config_; // user configuration and parameters + const WebPPicture* pic_; // input picture. + + uint32_t* argb_; // Transformed argb image data. + VP8LEncoderARGBContent argb_content_; // Content type of the argb buffer. + uint32_t* argb_scratch_; // Scratch memory for argb rows + // (used for prediction). + uint32_t* transform_data_; // Scratch memory for transform data. + uint32_t* transform_mem_; // Currently allocated memory. + size_t transform_mem_size_; // Currently allocated memory size. + + int current_width_; // Corresponds to packed image width. + + // Encoding parameters derived from quality parameter. + int histo_bits_; + int transform_bits_; // <= MAX_TRANSFORM_BITS. + int cache_bits_; // If equal to 0, don't use color cache. + + // Encoding parameters derived from image characteristics. + int use_cross_color_; + int use_subtract_green_; + int use_predict_; + int use_palette_; + int palette_size_; + uint32_t palette_[MAX_PALETTE_SIZE]; + // Sorted version of palette_ for cache purposes. + uint32_t palette_sorted_[MAX_PALETTE_SIZE]; + + // Some 'scratch' (potentially large) objects. + struct VP8LBackwardRefs refs_[4]; // Backward Refs array for temporaries. + VP8LHashChain hash_chain_; // HashChain data for constructing + // backward references. +} VP8LEncoder; + +//------------------------------------------------------------------------------ +// internal functions. Not public. + +// Encodes the picture. +// Returns 0 if config or picture is NULL or picture doesn't have valid argb +// input. +int VP8LEncodeImage(const WebPConfig* const config, + const WebPPicture* const picture); + +// Encodes the main image stream using the supplied bit writer. +// If 'use_cache' is false, disables the use of color cache. +// Returns false in case of error (stored in picture->error_code). +int VP8LEncodeStream(const WebPConfig* const config, + const WebPPicture* const picture, VP8LBitWriter* const bw, + int use_cache); + +#if (WEBP_NEAR_LOSSLESS == 1) +// in near_lossless.c +// Near lossless preprocessing in RGB color-space. +int VP8ApplyNearLossless(const WebPPicture* const picture, int quality, + uint32_t* const argb_dst); +#endif + +//------------------------------------------------------------------------------ +// Image transforms in predictor.c. + +// pic and percent are for progress. +// Returns false in case of error (stored in pic->error_code). +int VP8LResidualImage(int width, int height, int bits, int low_effort, + uint32_t* const argb, uint32_t* const argb_scratch, + uint32_t* const image, int near_lossless, int exact, + int used_subtract_green, const WebPPicture* const pic, + int percent_range, int* const percent); + +int VP8LColorSpaceTransform(int width, int height, int bits, int quality, + uint32_t* const argb, uint32_t* image, + const WebPPicture* const pic, int percent_range, + int* const percent); + +//------------------------------------------------------------------------------ + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // WEBP_ENC_VP8LI_ENC_H_ |