| // Copyright 2011 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. |
| // ----------------------------------------------------------------------------- |
| // |
| // WebP encoder: internal header. |
| // |
| // Author: Skal (pascal.massimino@gmail.com) |
| |
| #ifndef WEBP_ENC_VP8I_ENC_H_ |
| #define WEBP_ENC_VP8I_ENC_H_ |
| |
| #include <string.h> // for memcpy() |
| #include "src/dec/common_dec.h" |
| #include "src/dsp/dsp.h" |
| #include "src/utils/bit_writer_utils.h" |
| #include "src/utils/thread_utils.h" |
| #include "src/utils/utils.h" |
| #include "src/webp/encode.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // Various defines and enums |
| |
| // version numbers |
| #define ENC_MAJ_VERSION 1 |
| #define ENC_MIN_VERSION 2 |
| #define ENC_REV_VERSION 2 |
| |
| enum { MAX_LF_LEVELS = 64, // Maximum loop filter level |
| MAX_VARIABLE_LEVEL = 67, // last (inclusive) level with variable cost |
| MAX_LEVEL = 2047 // max level (note: max codable is 2047 + 67) |
| }; |
| |
| typedef enum { // Rate-distortion optimization levels |
| RD_OPT_NONE = 0, // no rd-opt |
| RD_OPT_BASIC = 1, // basic scoring (no trellis) |
| RD_OPT_TRELLIS = 2, // perform trellis-quant on the final decision only |
| RD_OPT_TRELLIS_ALL = 3 // trellis-quant for every scoring (much slower) |
| } VP8RDLevel; |
| |
| // YUV-cache parameters. Cache is 32-bytes wide (= one cacheline). |
| // The original or reconstructed samples can be accessed using VP8Scan[]. |
| // The predicted blocks can be accessed using offsets to yuv_p_ and |
| // the arrays VP8*ModeOffsets[]. |
| // * YUV Samples area (yuv_in_/yuv_out_/yuv_out2_) |
| // (see VP8Scan[] for accessing the blocks, along with |
| // Y_OFF_ENC/U_OFF_ENC/V_OFF_ENC): |
| // +----+----+ |
| // Y_OFF_ENC |YYYY|UUVV| |
| // U_OFF_ENC |YYYY|UUVV| |
| // V_OFF_ENC |YYYY|....| <- 25% wasted U/V area |
| // |YYYY|....| |
| // +----+----+ |
| // * Prediction area ('yuv_p_', size = PRED_SIZE_ENC) |
| // Intra16 predictions (16x16 block each, two per row): |
| // |I16DC16|I16TM16| |
| // |I16VE16|I16HE16| |
| // Chroma U/V predictions (16x8 block each, two per row): |
| // |C8DC8|C8TM8| |
| // |C8VE8|C8HE8| |
| // Intra 4x4 predictions (4x4 block each) |
| // |I4DC4 I4TM4 I4VE4 I4HE4|I4RD4 I4VR4 I4LD4 I4VL4| |
| // |I4HD4 I4HU4 I4TMP .....|.......................| <- ~31% wasted |
| #define YUV_SIZE_ENC (BPS * 16) |
| #define PRED_SIZE_ENC (32 * BPS + 16 * BPS + 8 * BPS) // I16+Chroma+I4 preds |
| #define Y_OFF_ENC (0) |
| #define U_OFF_ENC (16) |
| #define V_OFF_ENC (16 + 8) |
| |
| extern const uint16_t VP8Scan[16]; |
| extern const uint16_t VP8UVModeOffsets[4]; |
| extern const uint16_t VP8I16ModeOffsets[4]; |
| extern const uint16_t VP8I4ModeOffsets[NUM_BMODES]; |
| |
| // Layout of prediction blocks |
| // intra 16x16 |
| #define I16DC16 (0 * 16 * BPS) |
| #define I16TM16 (I16DC16 + 16) |
| #define I16VE16 (1 * 16 * BPS) |
| #define I16HE16 (I16VE16 + 16) |
| // chroma 8x8, two U/V blocks side by side (hence: 16x8 each) |
| #define C8DC8 (2 * 16 * BPS) |
| #define C8TM8 (C8DC8 + 1 * 16) |
| #define C8VE8 (2 * 16 * BPS + 8 * BPS) |
| #define C8HE8 (C8VE8 + 1 * 16) |
| // intra 4x4 |
| #define I4DC4 (3 * 16 * BPS + 0) |
| #define I4TM4 (I4DC4 + 4) |
| #define I4VE4 (I4DC4 + 8) |
| #define I4HE4 (I4DC4 + 12) |
| #define I4RD4 (I4DC4 + 16) |
| #define I4VR4 (I4DC4 + 20) |
| #define I4LD4 (I4DC4 + 24) |
| #define I4VL4 (I4DC4 + 28) |
| #define I4HD4 (3 * 16 * BPS + 4 * BPS) |
| #define I4HU4 (I4HD4 + 4) |
| #define I4TMP (I4HD4 + 8) |
| |
| typedef int64_t score_t; // type used for scores, rate, distortion |
| // Note that MAX_COST is not the maximum allowed by sizeof(score_t), |
| // in order to allow overflowing computations. |
| #define MAX_COST ((score_t)0x7fffffffffffffLL) |
| |
| #define QFIX 17 |
| #define BIAS(b) ((b) << (QFIX - 8)) |
| // Fun fact: this is the _only_ line where we're actually being lossy and |
| // discarding bits. |
| static WEBP_INLINE int QUANTDIV(uint32_t n, uint32_t iQ, uint32_t B) { |
| return (int)((n * iQ + B) >> QFIX); |
| } |
| |
| // Uncomment the following to remove token-buffer code: |
| // #define DISABLE_TOKEN_BUFFER |
| |
| // quality below which error-diffusion is enabled |
| #define ERROR_DIFFUSION_QUALITY 98 |
| |
| //------------------------------------------------------------------------------ |
| // Headers |
| |
| typedef uint32_t proba_t; // 16b + 16b |
| typedef uint8_t ProbaArray[NUM_CTX][NUM_PROBAS]; |
| typedef proba_t StatsArray[NUM_CTX][NUM_PROBAS]; |
| typedef uint16_t CostArray[NUM_CTX][MAX_VARIABLE_LEVEL + 1]; |
| typedef const uint16_t* (*CostArrayPtr)[NUM_CTX]; // for easy casting |
| typedef const uint16_t* CostArrayMap[16][NUM_CTX]; |
| typedef double LFStats[NUM_MB_SEGMENTS][MAX_LF_LEVELS]; // filter stats |
| |
| typedef struct VP8Encoder VP8Encoder; |
| |
| // segment features |
| typedef struct { |
| int num_segments_; // Actual number of segments. 1 segment only = unused. |
| int update_map_; // whether to update the segment map or not. |
| // must be 0 if there's only 1 segment. |
| int size_; // bit-cost for transmitting the segment map |
| } VP8EncSegmentHeader; |
| |
| // Struct collecting all frame-persistent probabilities. |
| typedef struct { |
| uint8_t segments_[3]; // probabilities for segment tree |
| uint8_t skip_proba_; // final probability of being skipped. |
| ProbaArray coeffs_[NUM_TYPES][NUM_BANDS]; // 1056 bytes |
| StatsArray stats_[NUM_TYPES][NUM_BANDS]; // 4224 bytes |
| CostArray level_cost_[NUM_TYPES][NUM_BANDS]; // 13056 bytes |
| CostArrayMap remapped_costs_[NUM_TYPES]; // 1536 bytes |
| int dirty_; // if true, need to call VP8CalculateLevelCosts() |
| int use_skip_proba_; // Note: we always use skip_proba for now. |
| int nb_skip_; // number of skipped blocks |
| } VP8EncProba; |
| |
| // Filter parameters. Not actually used in the code (we don't perform |
| // the in-loop filtering), but filled from user's config |
| typedef struct { |
| int simple_; // filtering type: 0=complex, 1=simple |
| int level_; // base filter level [0..63] |
| int sharpness_; // [0..7] |
| int i4x4_lf_delta_; // delta filter level for i4x4 relative to i16x16 |
| } VP8EncFilterHeader; |
| |
| //------------------------------------------------------------------------------ |
| // Informations about the macroblocks. |
| |
| typedef struct { |
| // block type |
| unsigned int type_:2; // 0=i4x4, 1=i16x16 |
| unsigned int uv_mode_:2; |
| unsigned int skip_:1; |
| unsigned int segment_:2; |
| uint8_t alpha_; // quantization-susceptibility |
| } VP8MBInfo; |
| |
| typedef struct VP8Matrix { |
| uint16_t q_[16]; // quantizer steps |
| uint16_t iq_[16]; // reciprocals, fixed point. |
| uint32_t bias_[16]; // rounding bias |
| uint32_t zthresh_[16]; // value below which a coefficient is zeroed |
| uint16_t sharpen_[16]; // frequency boosters for slight sharpening |
| } VP8Matrix; |
| |
| typedef struct { |
| VP8Matrix y1_, y2_, uv_; // quantization matrices |
| int alpha_; // quant-susceptibility, range [-127,127]. Zero is neutral. |
| // Lower values indicate a lower risk of blurriness. |
| int beta_; // filter-susceptibility, range [0,255]. |
| int quant_; // final segment quantizer. |
| int fstrength_; // final in-loop filtering strength |
| int max_edge_; // max edge delta (for filtering strength) |
| int min_disto_; // minimum distortion required to trigger filtering record |
| // reactivities |
| int lambda_i16_, lambda_i4_, lambda_uv_; |
| int lambda_mode_, lambda_trellis_, tlambda_; |
| int lambda_trellis_i16_, lambda_trellis_i4_, lambda_trellis_uv_; |
| |
| // lambda values for distortion-based evaluation |
| score_t i4_penalty_; // penalty for using Intra4 |
| } VP8SegmentInfo; |
| |
| typedef int8_t DError[2 /* u/v */][2 /* top or left */]; |
| |
| // Handy transient struct to accumulate score and info during RD-optimization |
| // and mode evaluation. |
| typedef struct { |
| score_t D, SD; // Distortion, spectral distortion |
| score_t H, R, score; // header bits, rate, score. |
| int16_t y_dc_levels[16]; // Quantized levels for luma-DC, luma-AC, chroma. |
| int16_t y_ac_levels[16][16]; |
| int16_t uv_levels[4 + 4][16]; |
| int mode_i16; // mode number for intra16 prediction |
| uint8_t modes_i4[16]; // mode numbers for intra4 predictions |
| int mode_uv; // mode number of chroma prediction |
| uint32_t nz; // non-zero blocks |
| int8_t derr[2][3]; // DC diffusion errors for U/V for blocks #1/2/3 |
| } VP8ModeScore; |
| |
| // Iterator structure to iterate through macroblocks, pointing to the |
| // right neighbouring data (samples, predictions, contexts, ...) |
| typedef struct { |
| int x_, y_; // current macroblock |
| uint8_t* yuv_in_; // input samples |
| uint8_t* yuv_out_; // output samples |
| uint8_t* yuv_out2_; // secondary buffer swapped with yuv_out_. |
| uint8_t* yuv_p_; // scratch buffer for prediction |
| VP8Encoder* enc_; // back-pointer |
| VP8MBInfo* mb_; // current macroblock |
| VP8BitWriter* bw_; // current bit-writer |
| uint8_t* preds_; // intra mode predictors (4x4 blocks) |
| uint32_t* nz_; // non-zero pattern |
| uint8_t i4_boundary_[37]; // 32+5 boundary samples needed by intra4x4 |
| uint8_t* i4_top_; // pointer to the current top boundary sample |
| int i4_; // current intra4x4 mode being tested |
| int top_nz_[9]; // top-non-zero context. |
| int left_nz_[9]; // left-non-zero. left_nz[8] is independent. |
| uint64_t bit_count_[4][3]; // bit counters for coded levels. |
| uint64_t luma_bits_; // macroblock bit-cost for luma |
| uint64_t uv_bits_; // macroblock bit-cost for chroma |
| LFStats* lf_stats_; // filter stats (borrowed from enc_) |
| int do_trellis_; // if true, perform extra level optimisation |
| int count_down_; // number of mb still to be processed |
| int count_down0_; // starting counter value (for progress) |
| int percent0_; // saved initial progress percent |
| |
| DError left_derr_; // left error diffusion (u/v) |
| DError* top_derr_; // top diffusion error - NULL if disabled |
| |
| uint8_t* y_left_; // left luma samples (addressable from index -1 to 15). |
| uint8_t* u_left_; // left u samples (addressable from index -1 to 7) |
| uint8_t* v_left_; // left v samples (addressable from index -1 to 7) |
| |
| uint8_t* y_top_; // top luma samples at position 'x_' |
| uint8_t* uv_top_; // top u/v samples at position 'x_', packed as 16 bytes |
| |
| // memory for storing y/u/v_left_ |
| uint8_t yuv_left_mem_[17 + 16 + 16 + 8 + WEBP_ALIGN_CST]; |
| // memory for yuv_* |
| uint8_t yuv_mem_[3 * YUV_SIZE_ENC + PRED_SIZE_ENC + WEBP_ALIGN_CST]; |
| } VP8EncIterator; |
| |
| // in iterator.c |
| // must be called first |
| void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it); |
| // restart a scan |
| void VP8IteratorReset(VP8EncIterator* const it); |
| // reset iterator position to row 'y' |
| void VP8IteratorSetRow(VP8EncIterator* const it, int y); |
| // set count down (=number of iterations to go) |
| void VP8IteratorSetCountDown(VP8EncIterator* const it, int count_down); |
| // return true if iteration is finished |
| int VP8IteratorIsDone(const VP8EncIterator* const it); |
| // Import uncompressed samples from source. |
| // If tmp_32 is not NULL, import boundary samples too. |
| // tmp_32 is a 32-bytes scratch buffer that must be aligned in memory. |
| void VP8IteratorImport(VP8EncIterator* const it, uint8_t* const tmp_32); |
| // export decimated samples |
| void VP8IteratorExport(const VP8EncIterator* const it); |
| // go to next macroblock. Returns false if not finished. |
| int VP8IteratorNext(VP8EncIterator* const it); |
| // save the yuv_out_ boundary values to top_/left_ arrays for next iterations. |
| void VP8IteratorSaveBoundary(VP8EncIterator* const it); |
| // Report progression based on macroblock rows. Return 0 for user-abort request. |
| int VP8IteratorProgress(const VP8EncIterator* const it, int delta); |
| // Intra4x4 iterations |
| void VP8IteratorStartI4(VP8EncIterator* const it); |
| // returns true if not done. |
| int VP8IteratorRotateI4(VP8EncIterator* const it, |
| const uint8_t* const yuv_out); |
| |
| // Non-zero context setup/teardown |
| void VP8IteratorNzToBytes(VP8EncIterator* const it); |
| void VP8IteratorBytesToNz(VP8EncIterator* const it); |
| |
| // Helper functions to set mode properties |
| void VP8SetIntra16Mode(const VP8EncIterator* const it, int mode); |
| void VP8SetIntra4Mode(const VP8EncIterator* const it, const uint8_t* modes); |
| void VP8SetIntraUVMode(const VP8EncIterator* const it, int mode); |
| void VP8SetSkip(const VP8EncIterator* const it, int skip); |
| void VP8SetSegment(const VP8EncIterator* const it, int segment); |
| |
| //------------------------------------------------------------------------------ |
| // Paginated token buffer |
| |
| typedef struct VP8Tokens VP8Tokens; // struct details in token.c |
| |
| typedef struct { |
| #if !defined(DISABLE_TOKEN_BUFFER) |
| VP8Tokens* pages_; // first page |
| VP8Tokens** last_page_; // last page |
| uint16_t* tokens_; // set to (*last_page_)->tokens_ |
| int left_; // how many free tokens left before the page is full |
| int page_size_; // number of tokens per page |
| #endif |
| int error_; // true in case of malloc error |
| } VP8TBuffer; |
| |
| // initialize an empty buffer |
| void VP8TBufferInit(VP8TBuffer* const b, int page_size); |
| void VP8TBufferClear(VP8TBuffer* const b); // de-allocate pages memory |
| |
| #if !defined(DISABLE_TOKEN_BUFFER) |
| |
| // Finalizes bitstream when probabilities are known. |
| // Deletes the allocated token memory if final_pass is true. |
| int VP8EmitTokens(VP8TBuffer* const b, VP8BitWriter* const bw, |
| const uint8_t* const probas, int final_pass); |
| |
| // record the coding of coefficients without knowing the probabilities yet |
| int VP8RecordCoeffTokens(int ctx, const struct VP8Residual* const res, |
| VP8TBuffer* const tokens); |
| |
| // Estimate the final coded size given a set of 'probas'. |
| size_t VP8EstimateTokenSize(VP8TBuffer* const b, const uint8_t* const probas); |
| |
| #endif // !DISABLE_TOKEN_BUFFER |
| |
| //------------------------------------------------------------------------------ |
| // VP8Encoder |
| |
| struct VP8Encoder { |
| const WebPConfig* config_; // user configuration and parameters |
| WebPPicture* pic_; // input / output picture |
| |
| // headers |
| VP8EncFilterHeader filter_hdr_; // filtering information |
| VP8EncSegmentHeader segment_hdr_; // segment information |
| |
| int profile_; // VP8's profile, deduced from Config. |
| |
| // dimension, in macroblock units. |
| int mb_w_, mb_h_; |
| int preds_w_; // stride of the *preds_ prediction plane (=4*mb_w + 1) |
| |
| // number of partitions (1, 2, 4 or 8 = MAX_NUM_PARTITIONS) |
| int num_parts_; |
| |
| // per-partition boolean decoders. |
| VP8BitWriter bw_; // part0 |
| VP8BitWriter parts_[MAX_NUM_PARTITIONS]; // token partitions |
| VP8TBuffer tokens_; // token buffer |
| |
| int percent_; // for progress |
| |
| // transparency blob |
| int has_alpha_; |
| uint8_t* alpha_data_; // non-NULL if transparency is present |
| uint32_t alpha_data_size_; |
| WebPWorker alpha_worker_; |
| |
| // quantization info (one set of DC/AC dequant factor per segment) |
| VP8SegmentInfo dqm_[NUM_MB_SEGMENTS]; |
| int base_quant_; // nominal quantizer value. Only used |
| // for relative coding of segments' quant. |
| int alpha_; // global susceptibility (<=> complexity) |
| int uv_alpha_; // U/V quantization susceptibility |
| // global offset of quantizers, shared by all segments |
| int dq_y1_dc_; |
| int dq_y2_dc_, dq_y2_ac_; |
| int dq_uv_dc_, dq_uv_ac_; |
| |
| // probabilities and statistics |
| VP8EncProba 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]; |
| |
| // 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 mb_header_limit_; // rough limit for header bits per MB |
| 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) |
| DError* top_derr_; // diffusion error (NULL if disabled) |
| }; |
| |
| //------------------------------------------------------------------------------ |
| // internal functions. Not public. |
| |
| // 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 VP8EncProba* 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 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 |
| |
| // 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); |
| |
| // Replace samples that are fully transparent by 'color' to help compressibility |
| // (no guarantee, though). Assumes pic->use_argb is true. |
| void WebPReplaceTransparentPixels(WebPPicture* const pic, uint32_t color); |
| |
| //------------------------------------------------------------------------------ |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // WEBP_ENC_VP8I_ENC_H_ |
