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https://github.com/NekoX-Dev/NekoX.git
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583 lines
23 KiB
C
583 lines
23 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// WebP encoder: internal header.
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#ifndef WEBP_ENC_VP8ENCI_H_
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#define WEBP_ENC_VP8ENCI_H_
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#include <string.h> // for memcpy()
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#include "../webp/encode.h"
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#include "../dsp/dsp.h"
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#include "../utils/bit_writer.h"
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#include "../utils/thread.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Various defines and enums
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// version numbers
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#define ENC_MAJ_VERSION 0
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#define ENC_MIN_VERSION 4
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#define ENC_REV_VERSION 2
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// intra prediction modes
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enum { B_DC_PRED = 0, // 4x4 modes
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B_TM_PRED = 1,
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B_VE_PRED = 2,
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B_HE_PRED = 3,
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B_RD_PRED = 4,
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B_VR_PRED = 5,
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B_LD_PRED = 6,
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B_VL_PRED = 7,
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B_HD_PRED = 8,
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B_HU_PRED = 9,
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NUM_BMODES = B_HU_PRED + 1 - B_DC_PRED, // = 10
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// Luma16 or UV modes
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DC_PRED = B_DC_PRED, V_PRED = B_VE_PRED,
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H_PRED = B_HE_PRED, TM_PRED = B_TM_PRED,
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NUM_PRED_MODES = 4
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};
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enum { NUM_MB_SEGMENTS = 4,
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MAX_NUM_PARTITIONS = 8,
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NUM_TYPES = 4, // 0: i16-AC, 1: i16-DC, 2:chroma-AC, 3:i4-AC
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NUM_BANDS = 8,
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NUM_CTX = 3,
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NUM_PROBAS = 11,
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MAX_LF_LEVELS = 64, // Maximum loop filter level
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MAX_VARIABLE_LEVEL = 67, // last (inclusive) level with variable cost
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MAX_LEVEL = 2047 // max level (note: max codable is 2047 + 67)
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};
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typedef enum { // Rate-distortion optimization levels
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RD_OPT_NONE = 0, // no rd-opt
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RD_OPT_BASIC = 1, // basic scoring (no trellis)
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RD_OPT_TRELLIS = 2, // perform trellis-quant on the final decision only
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RD_OPT_TRELLIS_ALL = 3 // trellis-quant for every scoring (much slower)
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} VP8RDLevel;
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// YUV-cache parameters. Cache is 16-pixels wide.
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// The original or reconstructed samples can be accessed using VP8Scan[]
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// The predicted blocks can be accessed using offsets to yuv_p_ and
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// the arrays VP8*ModeOffsets[];
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// +----+ YUV Samples area. See VP8Scan[] for accessing the blocks.
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// Y_OFF |YYYY| <- original samples ('yuv_in_')
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// |YYYY|
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// |YYYY|
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// |YYYY|
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// U_OFF |UUVV| V_OFF (=U_OFF + 8)
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// |UUVV|
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// +----+
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// Y_OFF |YYYY| <- compressed/decoded samples ('yuv_out_')
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// |YYYY| There are two buffers like this ('yuv_out_'/'yuv_out2_')
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// |YYYY|
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// |YYYY|
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// U_OFF |UUVV| V_OFF
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// |UUVV|
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// x2 (for yuv_out2_)
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// +----+ Prediction area ('yuv_p_', size = PRED_SIZE)
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// I16DC16 |YYYY| Intra16 predictions (16x16 block each)
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// |YYYY|
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// |YYYY|
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// |YYYY|
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// I16TM16 |YYYY|
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// |YYYY|
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// |YYYY|
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// |YYYY|
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// I16VE16 |YYYY|
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// |YYYY|
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// |YYYY|
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// |YYYY|
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// I16HE16 |YYYY|
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// |YYYY|
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// |YYYY|
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// |YYYY|
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// +----+ Chroma U/V predictions (16x8 block each)
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// C8DC8 |UUVV|
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// |UUVV|
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// C8TM8 |UUVV|
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// |UUVV|
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// C8VE8 |UUVV|
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// |UUVV|
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// C8HE8 |UUVV|
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// |UUVV|
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// +----+ Intra 4x4 predictions (4x4 block each)
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// |YYYY| I4DC4 I4TM4 I4VE4 I4HE4
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// |YYYY| I4RD4 I4VR4 I4LD4 I4VL4
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// |YY..| I4HD4 I4HU4 I4TMP
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// +----+
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#define BPS 16 // this is the common stride
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#define Y_SIZE (BPS * 16)
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#define UV_SIZE (BPS * 8)
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#define YUV_SIZE (Y_SIZE + UV_SIZE)
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#define PRED_SIZE (6 * 16 * BPS + 12 * BPS)
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#define Y_OFF (0)
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#define U_OFF (Y_SIZE)
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#define V_OFF (U_OFF + 8)
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#define ALIGN_CST 15
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#define DO_ALIGN(PTR) ((uintptr_t)((PTR) + ALIGN_CST) & ~ALIGN_CST)
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extern const int VP8Scan[16]; // in quant.c
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extern const int VP8UVModeOffsets[4]; // in analyze.c
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extern const int VP8I16ModeOffsets[4];
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extern const int VP8I4ModeOffsets[NUM_BMODES];
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// Layout of prediction blocks
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// intra 16x16
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#define I16DC16 (0 * 16 * BPS)
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#define I16TM16 (1 * 16 * BPS)
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#define I16VE16 (2 * 16 * BPS)
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#define I16HE16 (3 * 16 * BPS)
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// chroma 8x8, two U/V blocks side by side (hence: 16x8 each)
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#define C8DC8 (4 * 16 * BPS)
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#define C8TM8 (4 * 16 * BPS + 8 * BPS)
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#define C8VE8 (5 * 16 * BPS)
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#define C8HE8 (5 * 16 * BPS + 8 * BPS)
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// intra 4x4
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#define I4DC4 (6 * 16 * BPS + 0)
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#define I4TM4 (6 * 16 * BPS + 4)
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#define I4VE4 (6 * 16 * BPS + 8)
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#define I4HE4 (6 * 16 * BPS + 12)
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#define I4RD4 (6 * 16 * BPS + 4 * BPS + 0)
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#define I4VR4 (6 * 16 * BPS + 4 * BPS + 4)
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#define I4LD4 (6 * 16 * BPS + 4 * BPS + 8)
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#define I4VL4 (6 * 16 * BPS + 4 * BPS + 12)
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#define I4HD4 (6 * 16 * BPS + 8 * BPS + 0)
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#define I4HU4 (6 * 16 * BPS + 8 * BPS + 4)
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#define I4TMP (6 * 16 * BPS + 8 * BPS + 8)
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typedef int64_t score_t; // type used for scores, rate, distortion
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// Note that MAX_COST is not the maximum allowed by sizeof(score_t),
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// in order to allow overflowing computations.
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#define MAX_COST ((score_t)0x7fffffffffffffLL)
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#define QFIX 17
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#define BIAS(b) ((b) << (QFIX - 8))
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// Fun fact: this is the _only_ line where we're actually being lossy and
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// discarding bits.
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static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) {
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return (int)((n * iQ + B) >> QFIX);
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}
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// size of histogram used by CollectHistogram.
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#define MAX_COEFF_THRESH 31
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typedef struct VP8Histogram VP8Histogram;
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struct VP8Histogram {
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// TODO(skal): we only need to store the max_value and last_non_zero actually.
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int distribution[MAX_COEFF_THRESH + 1];
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};
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// Uncomment the following to remove token-buffer code:
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// #define DISABLE_TOKEN_BUFFER
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//------------------------------------------------------------------------------
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// Headers
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typedef uint32_t proba_t; // 16b + 16b
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typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS];
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typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS];
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typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1];
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typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats
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typedef struct VP8Encoder VP8Encoder;
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// segment features
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typedef struct {
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int num_segments_; // Actual number of segments. 1 segment only = unused.
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int update_map_; // whether to update the segment map or not.
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// must be 0 if there's only 1 segment.
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int size_; // bit-cost for transmitting the segment map
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} VP8SegmentHeader;
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// Struct collecting all frame-persistent probabilities.
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typedef struct {
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uint8_t segments_[3]; // probabilities for segment tree
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uint8_t skip_proba_; // final probability of being skipped.
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ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 1056 bytes
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StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes
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CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 13056 bytes
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int dirty_; // if true, need to call VP8CalculateLevelCosts()
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int use_skip_proba_; // Note: we always use skip_proba for now.
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int nb_skip_; // number of skipped blocks
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} VP8Proba;
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// Filter parameters. Not actually used in the code (we don't perform
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// the in-loop filtering), but filled from user's config
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typedef struct {
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int simple_; // filtering type: 0=complex, 1=simple
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int level_; // base filter level [0..63]
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int sharpness_; // [0..7]
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int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16
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} VP8FilterHeader;
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//------------------------------------------------------------------------------
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// Informations about the macroblocks.
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typedef struct {
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// block type
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unsigned int type_:2; // 0=i4x4, 1=i16x16
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unsigned int uv_mode_:2;
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unsigned int skip_:1;
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unsigned int segment_:2;
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uint8_t alpha_; // quantization-susceptibility
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} VP8MBInfo;
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typedef struct VP8Matrix {
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uint16_t q_[16]; // quantizer steps
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uint16_t iq_[16]; // reciprocals, fixed point.
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uint32_t bias_[16]; // rounding bias
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uint32_t zthresh_[16]; // value below which a coefficient is zeroed
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uint16_t sharpen_[16]; // frequency boosters for slight sharpening
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} VP8Matrix;
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typedef struct {
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VP8Matrix y1_, y2_, uv_; // quantization matrices
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int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral.
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// Lower values indicate a lower risk of blurriness.
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int beta_; // filter-susceptibility, range [0,255].
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int quant_; // final segment quantizer.
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int fstrength_; // final in-loop filtering strength
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int max_edge_; // max edge delta (for filtering strength)
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int min_disto_; // minimum distortion required to trigger filtering record
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// reactivities
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int lambda_i16_, lambda_i4_, lambda_uv_;
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int lambda_mode_, lambda_trellis_, tlambda_;
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int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_;
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} VP8SegmentInfo;
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// Handy transient struct to accumulate score and info during RD-optimization
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// and mode evaluation.
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typedef struct {
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score_t D, SD; // Distortion, spectral distortion
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score_t H, R, score; // header bits, rate, score.
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int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma.
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int16_t y_ac_levels[16][16];
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int16_t uv_levels[4 + 4][16];
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int mode_i16; // mode number for intra16 prediction
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uint8_t modes_i4[16]; // mode numbers for intra4 predictions
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int mode_uv; // mode number of chroma prediction
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uint32_t nz; // non-zero blocks
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} VP8ModeScore;
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// Iterator structure to iterate through macroblocks, pointing to the
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// right neighbouring data (samples, predictions, contexts, ...)
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typedef struct {
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int x_, y_; // current macroblock
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int y_stride_, uv_stride_; // respective strides
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uint8_t* yuv_in_; // input samples
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uint8_t* yuv_out_; // output samples
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uint8_t* yuv_out2_; // secondary buffer swapped with yuv_out_.
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uint8_t* yuv_p_; // scratch buffer for prediction
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VP8Encoder* enc_; // back-pointer
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VP8MBInfo* mb_; // current macroblock
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VP8BitWriter* bw_; // current bit-writer
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uint8_t* preds_; // intra mode predictors (4x4 blocks)
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uint32_t* nz_; // non-zero pattern
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uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4
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uint8_t* i4_top_; // pointer to the current top boundary sample
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int i4_; // current intra4x4 mode being tested
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int top_nz_[9]; // top-non-zero context.
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int left_nz_[9]; // left-non-zero. left_nz[8] is independent.
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uint64_t bit_count_[4][3]; // bit counters for coded levels.
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uint64_t luma_bits_; // macroblock bit-cost for luma
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uint64_t uv_bits_; // macroblock bit-cost for chroma
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LFStats* lf_stats_; // filter stats (borrowed from enc_)
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int do_trellis_; // if true, perform extra level optimisation
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int count_down_; // number of mb still to be processed
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int count_down0_; // starting counter value (for progress)
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int percent0_; // saved initial progress percent
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uint8_t* y_left_; // left luma samples (addressable from index -1 to 15).
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uint8_t* u_left_; // left u samples (addressable from index -1 to 7)
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uint8_t* v_left_; // left v samples (addressable from index -1 to 7)
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uint8_t* y_top_; // top luma samples at position 'x_'
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uint8_t* uv_top_; // top u/v samples at position 'x_', packed as 16 bytes
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// memory for storing y/u/v_left_ and yuv_in_/out_*
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uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + ALIGN_CST]; // memory for *_left_
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uint8_t yuv_mem_[3 * YUV_SIZE + PRED_SIZE + ALIGN_CST]; // memory for yuv_*
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} VP8EncIterator;
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// in iterator.c
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// must be called first
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void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it);
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// restart a scan
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void VP8IteratorReset(VP8EncIterator* const it);
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// reset iterator position to row 'y'
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void VP8IteratorSetRow(VP8EncIterator* const it, int y);
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// set count down (=number of iterations to go)
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void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down);
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// return true if iteration is finished
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int VP8IteratorIsDone(const VP8EncIterator* const it);
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// Import uncompressed samples from source.
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// If tmp_32 is not NULL, import boundary samples too.
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// tmp_32 is a 32-bytes scratch buffer that must be aligned in memory.
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void VP8IteratorImport(VP8EncIterator* const it, uint8_t* tmp_32);
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// export decimated samples
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void VP8IteratorExport(const VP8EncIterator* const it);
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// go to next macroblock. Returns false if not finished.
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int VP8IteratorNext(VP8EncIterator* const it);
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// save the yuv_out_ boundary values to top_/left_ arrays for next iterations.
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void VP8IteratorSaveBoundary(VP8EncIterator* const it);
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// Report progression based on macroblock rows. Return 0 for user-abort request.
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int VP8IteratorProgress(const VP8EncIterator* const it,
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int final_delta_percent);
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// Intra4x4 iterations
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void VP8IteratorStartI4(VP8EncIterator* const it);
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// returns true if not done.
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int VP8IteratorRotateI4(VP8EncIterator* const it,
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const uint8_t* const yuv_out);
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// Non-zero context setup/teardown
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void VP8IteratorNzToBytes(VP8EncIterator* const it);
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void VP8IteratorBytesToNz(VP8EncIterator* const it);
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// Helper functions to set mode properties
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void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode);
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void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes);
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void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode);
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void VP8SetSkip(const VP8EncIterator* const it, int skip);
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void VP8SetSegment(const VP8EncIterator* const it, int segment);
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//------------------------------------------------------------------------------
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// Paginated token buffer
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typedef struct VP8Tokens VP8Tokens; // struct details in token.c
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typedef struct {
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#if !defined(DISABLE_TOKEN_BUFFER)
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VP8Tokens* pages_; // first page
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VP8Tokens** last_page_; // last page
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uint16_t* tokens_; // set to (*last_page_)->tokens_
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int left_; // how many free tokens left before the page is full
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int page_size_; // number of tokens per page
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#endif
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int error_; // true in case of malloc error
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} VP8TBuffer;
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// initialize an empty buffer
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void VP8TBufferInit(VP8TBuffer* const b, int page_size);
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void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory
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#if !defined(DISABLE_TOKEN_BUFFER)
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// Finalizes bitstream when probabilities are known.
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// Deletes the allocated token memory if final_pass is true.
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int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw,
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const uint8_t* const probas, int final_pass);
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// record the coding of coefficients without knowing the probabilities yet
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int VP8RecordCoeffTokens(int ctx, int coeff_type, int first, int last,
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const int16_t* const coeffs,
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VP8TBuffer* const tokens);
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// Estimate the final coded size given a set of 'probas'.
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size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas);
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// unused for now
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void VP8TokenToStats(const VP8TBuffer* const b, proba_t* const stats);
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#endif // !DISABLE_TOKEN_BUFFER
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//------------------------------------------------------------------------------
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// VP8Encoder
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struct VP8Encoder {
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const WebPConfig* config_; // user configuration and parameters
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WebPPicture* pic_; // input / output picture
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// headers
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VP8FilterHeader filter_hdr_; // filtering information
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VP8SegmentHeader segment_hdr_; // segment information
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int profile_; // VP8's profile, deduced from Config.
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// dimension, in macroblock units.
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int mb_w_, mb_h_;
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int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1)
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// number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS)
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int num_parts_;
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// per-partition boolean decoders.
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VP8BitWriter bw_; // part0
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VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions
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VP8TBuffer tokens_; // token buffer
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int percent_; // for progress
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// transparency blob
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int has_alpha_;
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uint8_t* alpha_data_; // non-NULL if transparency is present
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uint32_t alpha_data_size_;
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WebPWorker alpha_worker_;
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// quantization info (one set of DC/AC dequant factor per segment)
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VP8SegmentInfo dqm_[NUM_MB_SEGMENTS];
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int base_quant_; // nominal quantizer value. Only used
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// for relative coding of segments' quant.
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int alpha_; // global susceptibility (<=> complexity)
|
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int uv_alpha_; // U/V quantization susceptibility
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|
// global offset of quantizers, shared by all segments
|
|
int dq_y1_dc_;
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|
int dq_y2_dc_, dq_y2_ac_;
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|
int dq_uv_dc_, dq_uv_ac_;
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|
|
|
// probabilities and statistics
|
|
VP8Proba proba_;
|
|
uint64_t sse_[4]; // sum of Y/U/V/A squared errors for all macroblocks
|
|
uint64_t sse_count_; // pixel count for the sse_[] stats
|
|
int coded_size_;
|
|
int residual_bytes_[3][4];
|
|
int block_count_[3];
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|
|
|
// quality/speed settings
|
|
int method_; // 0=fastest, 6=best/slowest.
|
|
VP8RDLevel rd_opt_level_; // Deduced from method_.
|
|
int max_i4_header_bits_; // partition #0 safeness factor
|
|
int thread_level_; // derived from config->thread_level
|
|
int do_search_; // derived from config->target_XXX
|
|
int use_tokens_; // if true, use token buffer
|
|
|
|
// Memory
|
|
VP8MBInfo* mb_info_; // contextual macroblock infos (mb_w_ + 1)
|
|
uint8_t* preds_; // predictions modes: (4*mb_w+1) * (4*mb_h+1)
|
|
uint32_t* nz_; // non-zero bit context: mb_w+1
|
|
uint8_t* y_top_; // top luma samples.
|
|
uint8_t* uv_top_; // top u/v samples.
|
|
// U and V are packed into 16 bytes (8 U + 8 V)
|
|
LFStats* lf_stats_; // autofilter stats (if NULL, autofilter is off)
|
|
};
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|
|
|
//------------------------------------------------------------------------------
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|
// internal functions. Not public.
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|
|
|
// in tree.c
|
|
extern const uint8_t VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
|
|
extern const uint8_t
|
|
VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS];
|
|
// Reset the token probabilities to their initial (default) values
|
|
void VP8DefaultProbas(VP8Encoder* const enc);
|
|
// Write the token probabilities
|
|
void VP8WriteProbas(VP8BitWriter* const bw, const VP8Proba* const probas);
|
|
// Writes the partition #0 modes (that is: all intra modes)
|
|
void VP8CodeIntraModes(VP8Encoder* const enc);
|
|
|
|
// in syntax.c
|
|
// Generates the final bitstream by coding the partition0 and headers,
|
|
// and appending an assembly of all the pre-coded token partitions.
|
|
// Return true if everything is ok.
|
|
int VP8EncWrite(VP8Encoder* const enc);
|
|
// Release memory allocated for bit-writing in VP8EncLoop & seq.
|
|
void VP8EncFreeBitWriters(VP8Encoder* const enc);
|
|
|
|
// in frame.c
|
|
extern const uint8_t VP8EncBands[16 + 1];
|
|
extern const uint8_t VP8Cat3[];
|
|
extern const uint8_t VP8Cat4[];
|
|
extern const uint8_t VP8Cat5[];
|
|
extern const uint8_t VP8Cat6[];
|
|
|
|
// Form all the four Intra16x16 predictions in the yuv_p_ cache
|
|
void VP8MakeLuma16Preds(const VP8EncIterator* const it);
|
|
// Form all the four Chroma8x8 predictions in the yuv_p_ cache
|
|
void VP8MakeChroma8Preds(const VP8EncIterator* const it);
|
|
// Form all the ten Intra4x4 predictions in the yuv_p_ cache
|
|
// for the 4x4 block it->i4_
|
|
void VP8MakeIntra4Preds(const VP8EncIterator* const it);
|
|
// Rate calculation
|
|
int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd);
|
|
int VP8GetCostLuma4(VP8EncIterator* const it, const int16_t levels[16]);
|
|
int VP8GetCostUV(VP8EncIterator* const it, const VP8ModeScore* const rd);
|
|
// Main coding calls
|
|
int VP8EncLoop(VP8Encoder* const enc);
|
|
int VP8EncTokenLoop(VP8Encoder* const enc);
|
|
|
|
// in webpenc.c
|
|
// Assign an error code to a picture. Return false for convenience.
|
|
int WebPEncodingSetError(const WebPPicture* const pic, WebPEncodingError error);
|
|
int WebPReportProgress(const WebPPicture* const pic,
|
|
int percent, int* const percent_store);
|
|
|
|
// in analysis.c
|
|
// Main analysis loop. Decides the segmentations and complexity.
|
|
// Assigns a first guess for Intra16 and uvmode_ prediction modes.
|
|
int VP8EncAnalyze(VP8Encoder* const enc);
|
|
|
|
// in quant.c
|
|
// Sets up segment's quantization values, base_quant_ and filter strengths.
|
|
void VP8SetSegmentParams(VP8Encoder* const enc, float quality);
|
|
// Pick best modes and fills the levels. Returns true if skipped.
|
|
int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd,
|
|
VP8RDLevel rd_opt);
|
|
|
|
// in alpha.c
|
|
void VP8EncInitAlpha(VP8Encoder* const enc); // initialize alpha compression
|
|
int VP8EncStartAlpha(VP8Encoder* const enc); // start alpha coding process
|
|
int VP8EncFinishAlpha(VP8Encoder* const enc); // finalize compressed data
|
|
int VP8EncDeleteAlpha(VP8Encoder* const enc); // delete compressed data
|
|
|
|
// in filter.c
|
|
|
|
// SSIM utils
|
|
typedef struct {
|
|
double w, xm, ym, xxm, xym, yym;
|
|
} DistoStats;
|
|
void VP8SSIMAddStats(const DistoStats* const src, DistoStats* const dst);
|
|
void VP8SSIMAccumulatePlane(const uint8_t* src1, int stride1,
|
|
const uint8_t* src2, int stride2,
|
|
int W, int H, DistoStats* const stats);
|
|
double VP8SSIMGet(const DistoStats* const stats);
|
|
double VP8SSIMGetSquaredError(const DistoStats* const stats);
|
|
|
|
// autofilter
|
|
void VP8InitFilter(VP8EncIterator* const it);
|
|
void VP8StoreFilterStats(VP8EncIterator* const it);
|
|
void VP8AdjustFilterStrength(VP8EncIterator* const it);
|
|
|
|
// returns the approximate filtering strength needed to smooth a edge
|
|
// step of 'delta', given a sharpness parameter 'sharpness'.
|
|
int VP8FilterStrengthFromDelta(int sharpness, int delta);
|
|
|
|
// misc utils for picture_*.c:
|
|
|
|
// Remove reference to the ARGB/YUVA buffer (doesn't free anything).
|
|
void WebPPictureResetBuffers(WebPPicture* const picture);
|
|
|
|
// Allocates ARGB buffer of given dimension (previous one is always free'd).
|
|
// Preserves the YUV(A) buffer. Returns false in case of error (invalid param,
|
|
// out-of-memory).
|
|
int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height);
|
|
|
|
// Allocates YUVA buffer of given dimension (previous one is always free'd).
|
|
// Uses picture->csp to determine whether an alpha buffer is needed.
|
|
// Preserves the ARGB buffer.
|
|
// Returns false in case of error (invalid param, out-of-memory).
|
|
int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height);
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
#if WEBP_ENCODER_ABI_VERSION <= 0x0203
|
|
void WebPMemoryWriterClear(WebPMemoryWriter* writer);
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif /* WEBP_ENC_VP8ENCI_H_ */
|