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+// 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_