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PK���\�`|�nZnZdecode.hnu�[���// Copyright 2010 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.
// -----------------------------------------------------------------------------
//
//  Main decoding functions for WebP images.
//
// Author: Skal (pascal.massimino@gmail.com)

#ifndef WEBP_WEBP_DECODE_H_
#define WEBP_WEBP_DECODE_H_

#include "./types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define WEBP_DECODER_ABI_VERSION 0x0208    // MAJOR(8b) + MINOR(8b)

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum VP8StatusCode VP8StatusCode;
// typedef enum WEBP_CSP_MODE WEBP_CSP_MODE;
typedef struct WebPRGBABuffer WebPRGBABuffer;
typedef struct WebPYUVABuffer WebPYUVABuffer;
typedef struct WebPDecBuffer WebPDecBuffer;
typedef struct WebPIDecoder WebPIDecoder;
typedef struct WebPBitstreamFeatures WebPBitstreamFeatures;
typedef struct WebPDecoderOptions WebPDecoderOptions;
typedef struct WebPDecoderConfig WebPDecoderConfig;

// Return the decoder's version number, packed in hexadecimal using 8bits for
// each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetDecoderVersion(void);

// Retrieve basic header information: width, height.
// This function will also validate the header, returning true on success,
// false otherwise. '*width' and '*height' are only valid on successful return.
// Pointers 'width' and 'height' can be passed NULL if deemed irrelevant.
WEBP_EXTERN int WebPGetInfo(const uint8_t* data, size_t data_size,
                            int* width, int* height);

// Decodes WebP images pointed to by 'data' and returns RGBA samples, along
// with the dimensions in *width and *height. The ordering of samples in
// memory is R, G, B, A, R, G, B, A... in scan order (endian-independent).
// The returned pointer should be deleted calling WebPFree().
// Returns NULL in case of error.
WEBP_EXTERN uint8_t* WebPDecodeRGBA(const uint8_t* data, size_t data_size,
                                    int* width, int* height);

// Same as WebPDecodeRGBA, but returning A, R, G, B, A, R, G, B... ordered data.
WEBP_EXTERN uint8_t* WebPDecodeARGB(const uint8_t* data, size_t data_size,
                                    int* width, int* height);

// Same as WebPDecodeRGBA, but returning B, G, R, A, B, G, R, A... ordered data.
WEBP_EXTERN uint8_t* WebPDecodeBGRA(const uint8_t* data, size_t data_size,
                                    int* width, int* height);

// Same as WebPDecodeRGBA, but returning R, G, B, R, G, B... ordered data.
// If the bitstream contains transparency, it is ignored.
WEBP_EXTERN uint8_t* WebPDecodeRGB(const uint8_t* data, size_t data_size,
                                   int* width, int* height);

// Same as WebPDecodeRGB, but returning B, G, R, B, G, R... ordered data.
WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
                                   int* width, int* height);

// Decode WebP images pointed to by 'data' to Y'UV format(*). The pointer
// returned is the Y samples buffer. Upon return, *u and *v will point to
// the U and V chroma data. These U and V buffers need NOT be passed to
// WebPFree(), unlike the returned Y luma one. The dimension of the U and V
// planes are both (*width + 1) / 2 and (*height + 1)/ 2.
// Upon return, the Y buffer has a stride returned as '*stride', while U and V
// have a common stride returned as '*uv_stride'.
// Return NULL in case of error.
// (*) Also named Y'CbCr. See: http://en.wikipedia.org/wiki/YCbCr
WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
                                   int* width, int* height,
                                   uint8_t** u, uint8_t** v,
                                   int* stride, int* uv_stride);

// Releases memory returned by the WebPDecode*() functions above.
WEBP_EXTERN void WebPFree(void* ptr);

// These five functions are variants of the above ones, that decode the image
// directly into a pre-allocated buffer 'output_buffer'. The maximum storage
// available in this buffer is indicated by 'output_buffer_size'. If this
// storage is not sufficient (or an error occurred), NULL is returned.
// Otherwise, output_buffer is returned, for convenience.
// The parameter 'output_stride' specifies the distance (in bytes)
// between scanlines. Hence, output_buffer_size is expected to be at least
// output_stride x picture-height.
WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
    const uint8_t* data, size_t data_size,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
    const uint8_t* data, size_t data_size,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
    const uint8_t* data, size_t data_size,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);

// RGB and BGR variants. Here too the transparency information, if present,
// will be dropped and ignored.
WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
    const uint8_t* data, size_t data_size,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
    const uint8_t* data, size_t data_size,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);

// WebPDecodeYUVInto() is a variant of WebPDecodeYUV() that operates directly
// into pre-allocated luma/chroma plane buffers. This function requires the
// strides to be passed: one for the luma plane and one for each of the
// chroma ones. The size of each plane buffer is passed as 'luma_size',
// 'u_size' and 'v_size' respectively.
// Pointer to the luma plane ('*luma') is returned or NULL if an error occurred
// during decoding (or because some buffers were found to be too small).
WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
    const uint8_t* data, size_t data_size,
    uint8_t* luma, size_t luma_size, int luma_stride,
    uint8_t* u, size_t u_size, int u_stride,
    uint8_t* v, size_t v_size, int v_stride);

//------------------------------------------------------------------------------
// Output colorspaces and buffer

// Colorspaces
// Note: the naming describes the byte-ordering of packed samples in memory.
// For instance, MODE_BGRA relates to samples ordered as B,G,R,A,B,G,R,A,...
// Non-capital names (e.g.:MODE_Argb) relates to pre-multiplied RGB channels.
// RGBA-4444 and RGB-565 colorspaces are represented by following byte-order:
// RGBA-4444: [r3 r2 r1 r0 g3 g2 g1 g0], [b3 b2 b1 b0 a3 a2 a1 a0], ...
// RGB-565: [r4 r3 r2 r1 r0 g5 g4 g3], [g2 g1 g0 b4 b3 b2 b1 b0], ...
// In the case WEBP_SWAP_16BITS_CSP is defined, the bytes are swapped for
// these two modes:
// RGBA-4444: [b3 b2 b1 b0 a3 a2 a1 a0], [r3 r2 r1 r0 g3 g2 g1 g0], ...
// RGB-565: [g2 g1 g0 b4 b3 b2 b1 b0], [r4 r3 r2 r1 r0 g5 g4 g3], ...

typedef enum WEBP_CSP_MODE {
  MODE_RGB = 0, MODE_RGBA = 1,
  MODE_BGR = 2, MODE_BGRA = 3,
  MODE_ARGB = 4, MODE_RGBA_4444 = 5,
  MODE_RGB_565 = 6,
  // RGB-premultiplied transparent modes (alpha value is preserved)
  MODE_rgbA = 7,
  MODE_bgrA = 8,
  MODE_Argb = 9,
  MODE_rgbA_4444 = 10,
  // YUV modes must come after RGB ones.
  MODE_YUV = 11, MODE_YUVA = 12,  // yuv 4:2:0
  MODE_LAST = 13
} WEBP_CSP_MODE;

// Some useful macros:
static WEBP_INLINE int WebPIsPremultipliedMode(WEBP_CSP_MODE mode) {
  return (mode == MODE_rgbA || mode == MODE_bgrA || mode == MODE_Argb ||
          mode == MODE_rgbA_4444);
}

static WEBP_INLINE int WebPIsAlphaMode(WEBP_CSP_MODE mode) {
  return (mode == MODE_RGBA || mode == MODE_BGRA || mode == MODE_ARGB ||
          mode == MODE_RGBA_4444 || mode == MODE_YUVA ||
          WebPIsPremultipliedMode(mode));
}

static WEBP_INLINE int WebPIsRGBMode(WEBP_CSP_MODE mode) {
  return (mode < MODE_YUV);
}

//------------------------------------------------------------------------------
// WebPDecBuffer: Generic structure for describing the output sample buffer.

struct WebPRGBABuffer {    // view as RGBA
  uint8_t* rgba;    // pointer to RGBA samples
  int stride;       // stride in bytes from one scanline to the next.
  size_t size;      // total size of the *rgba buffer.
};

struct WebPYUVABuffer {              // view as YUVA
  uint8_t* y, *u, *v, *a;     // pointer to luma, chroma U/V, alpha samples
  int y_stride;               // luma stride
  int u_stride, v_stride;     // chroma strides
  int a_stride;               // alpha stride
  size_t y_size;              // luma plane size
  size_t u_size, v_size;      // chroma planes size
  size_t a_size;              // alpha-plane size
};

// Output buffer
struct WebPDecBuffer {
  WEBP_CSP_MODE colorspace;  // Colorspace.
  int width, height;         // Dimensions.
  int is_external_memory;    // If non-zero, 'internal_memory' pointer is not
                             // used. If value is '2' or more, the external
                             // memory is considered 'slow' and multiple
                             // read/write will be avoided.
  union {
    WebPRGBABuffer RGBA;
    WebPYUVABuffer YUVA;
  } u;                       // Nameless union of buffer parameters.
  uint32_t       pad[4];     // padding for later use

uint8_t* private_memory;   // Internally allocated memory (only when
                             // is_external_memory is 0). Should not be used
                             // externally, but accessed via the buffer union.
};

// Internal, version-checked, entry point
WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);

// Initialize the structure as empty. Must be called before any other use.
// Returns false in case of version mismatch
static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
  return WebPInitDecBufferInternal(buffer, WEBP_DECODER_ABI_VERSION);
}

// Free any memory associated with the buffer. Must always be called last.
// Note: doesn't free the 'buffer' structure itself.
WEBP_EXTERN void WebPFreeDecBuffer(WebPDecBuffer* buffer);

//------------------------------------------------------------------------------
// Enumeration of the status codes

typedef enum VP8StatusCode {
  VP8_STATUS_OK = 0,
  VP8_STATUS_OUT_OF_MEMORY,
  VP8_STATUS_INVALID_PARAM,
  VP8_STATUS_BITSTREAM_ERROR,
  VP8_STATUS_UNSUPPORTED_FEATURE,
  VP8_STATUS_SUSPENDED,
  VP8_STATUS_USER_ABORT,
  VP8_STATUS_NOT_ENOUGH_DATA
} VP8StatusCode;

//------------------------------------------------------------------------------
// Incremental decoding
//
// This API allows streamlined decoding of partial data.
// Picture can be incrementally decoded as data become available thanks to the
// WebPIDecoder object. This object can be left in a SUSPENDED state if the
// picture is only partially decoded, pending additional input.
// Code example:
//
//   WebPInitDecBuffer(&output_buffer);
//   output_buffer.colorspace = mode;
//   ...
//   WebPIDecoder* idec = WebPINewDecoder(&output_buffer);
//   while (additional_data_is_available) {
//     // ... (get additional data in some new_data[] buffer)
//     status = WebPIAppend(idec, new_data, new_data_size);
//     if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) {
//       break;    // an error occurred.
//     }
//
//     // The above call decodes the current available buffer.
//     // Part of the image can now be refreshed by calling
//     // WebPIDecGetRGB()/WebPIDecGetYUVA() etc.
//   }
//   WebPIDelete(idec);

// Creates a new incremental decoder with the supplied buffer parameter.
// This output_buffer can be passed NULL, in which case a default output buffer
// is used (with MODE_RGB). Otherwise, an internal reference to 'output_buffer'
// is kept, which means that the lifespan of 'output_buffer' must be larger than
// that of the returned WebPIDecoder object.
// The supplied 'output_buffer' content MUST NOT be changed between calls to
// WebPIAppend() or WebPIUpdate() unless 'output_buffer.is_external_memory' is
// not set to 0. In such a case, it is allowed to modify the pointers, size and
// stride of output_buffer.u.RGBA or output_buffer.u.YUVA, provided they remain
// within valid bounds.
// All other fields of WebPDecBuffer MUST remain constant between calls.
// Returns NULL if the allocation failed.
WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);

// This function allocates and initializes an incremental-decoder object, which
// will output the RGB/A samples specified by 'csp' into a preallocated
// buffer 'output_buffer'. The size of this buffer is at least
// 'output_buffer_size' and the stride (distance in bytes between two scanlines)
// is specified by 'output_stride'.
// Additionally, output_buffer can be passed NULL in which case the output
// buffer will be allocated automatically when the decoding starts. The
// colorspace 'csp' is taken into account for allocating this buffer. All other
// parameters are ignored.
// Returns NULL if the allocation failed, or if some parameters are invalid.
WEBP_EXTERN WebPIDecoder* WebPINewRGB(
    WEBP_CSP_MODE csp,
    uint8_t* output_buffer, size_t output_buffer_size, int output_stride);

// This function allocates and initializes an incremental-decoder object, which
// will output the raw luma/chroma samples into a preallocated planes if
// supplied. The luma plane is specified by its pointer 'luma', its size
// 'luma_size' and its stride 'luma_stride'. Similarly, the chroma-u plane
// is specified by the 'u', 'u_size' and 'u_stride' parameters, and the chroma-v
// plane by 'v' and 'v_size'. And same for the alpha-plane. The 'a' pointer
// can be pass NULL in case one is not interested in the transparency plane.
// Conversely, 'luma' can be passed NULL if no preallocated planes are supplied.
// In this case, the output buffer will be automatically allocated (using
// MODE_YUVA) when decoding starts. All parameters are then ignored.
// Returns NULL if the allocation failed or if a parameter is invalid.
WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
    uint8_t* luma, size_t luma_size, int luma_stride,
    uint8_t* u, size_t u_size, int u_stride,
    uint8_t* v, size_t v_size, int v_stride,
    uint8_t* a, size_t a_size, int a_stride);

// Deprecated version of the above, without the alpha plane.
// Kept for backward compatibility.
WEBP_EXTERN WebPIDecoder* WebPINewYUV(
    uint8_t* luma, size_t luma_size, int luma_stride,
    uint8_t* u, size_t u_size, int u_stride,
    uint8_t* v, size_t v_size, int v_stride);

// Deletes the WebPIDecoder object and associated memory. Must always be called
// if WebPINewDecoder, WebPINewRGB or WebPINewYUV succeeded.
WEBP_EXTERN void WebPIDelete(WebPIDecoder* idec);

// Copies and decodes the next available data. Returns VP8_STATUS_OK when
// the image is successfully decoded. Returns VP8_STATUS_SUSPENDED when more
// data is expected. Returns error in other cases.
WEBP_EXTERN VP8StatusCode WebPIAppend(
    WebPIDecoder* idec, const uint8_t* data, size_t data_size);

// A variant of the above function to be used when data buffer contains
// partial data from the beginning. In this case data buffer is not copied
// to the internal memory.
// Note that the value of the 'data' pointer can change between calls to
// WebPIUpdate, for instance when the data buffer is resized to fit larger data.
WEBP_EXTERN VP8StatusCode WebPIUpdate(
    WebPIDecoder* idec, const uint8_t* data, size_t data_size);

// Returns the RGB/A image decoded so far. Returns NULL if output params
// are not initialized yet. The RGB/A output type corresponds to the colorspace
// specified during call to WebPINewDecoder() or WebPINewRGB().
// *last_y is the index of last decoded row in raster scan order. Some pointers
// (*last_y, *width etc.) can be NULL if corresponding information is not
// needed. The values in these pointers are only valid on successful (non-NULL)
// return.
WEBP_EXTERN uint8_t* WebPIDecGetRGB(
    const WebPIDecoder* idec, int* last_y,
    int* width, int* height, int* stride);

// Same as above function to get a YUVA image. Returns pointer to the luma
// plane or NULL in case of error. If there is no alpha information
// the alpha pointer '*a' will be returned NULL.
WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
    const WebPIDecoder* idec, int* last_y,
    uint8_t** u, uint8_t** v, uint8_t** a,
    int* width, int* height, int* stride, int* uv_stride, int* a_stride);

// Deprecated alpha-less version of WebPIDecGetYUVA(): it will ignore the
// alpha information (if present). Kept for backward compatibility.
static WEBP_INLINE uint8_t* WebPIDecGetYUV(
    const WebPIDecoder* idec, int* last_y, uint8_t** u, uint8_t** v,
    int* width, int* height, int* stride, int* uv_stride) {
  return WebPIDecGetYUVA(idec, last_y, u, v, NULL, width, height,
                         stride, uv_stride, NULL);
}

// Generic call to retrieve information about the displayable area.
// If non NULL, the left/right/width/height pointers are filled with the visible
// rectangular area so far.
// Returns NULL in case the incremental decoder object is in an invalid state.
// Otherwise returns the pointer to the internal representation. This structure
// is read-only, tied to WebPIDecoder's lifespan and should not be modified.
WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
    const WebPIDecoder* idec, int* left, int* top, int* width, int* height);

//------------------------------------------------------------------------------
// Advanced decoding parametrization
//
//  Code sample for using the advanced decoding API
/*
     // A) Init a configuration object
     WebPDecoderConfig config;
     CHECK(WebPInitDecoderConfig(&config));

// B) optional: retrieve the bitstream's features.
     CHECK(WebPGetFeatures(data, data_size, &config.input) == VP8_STATUS_OK);

// C) Adjust 'config', if needed
     config.no_fancy_upsampling = 1;
     config.output.colorspace = MODE_BGRA;
     // etc.

// Note that you can also make config.output point to an externally
     // supplied memory buffer, provided it's big enough to store the decoded
     // picture. Otherwise, config.output will just be used to allocate memory
     // and store the decoded picture.

// D) Decode!
     CHECK(WebPDecode(data, data_size, &config) == VP8_STATUS_OK);

// E) Decoded image is now in config.output (and config.output.u.RGBA)

// F) Reclaim memory allocated in config's object. It's safe to call
     // this function even if the memory is external and wasn't allocated
     // by WebPDecode().
     WebPFreeDecBuffer(&config.output);
*/

// Features gathered from the bitstream
struct WebPBitstreamFeatures {
  int width;          // Width in pixels, as read from the bitstream.
  int height;         // Height in pixels, as read from the bitstream.
  int has_alpha;      // True if the bitstream contains an alpha channel.
  int has_animation;  // True if the bitstream is an animation.
  int format;         // 0 = undefined (/mixed), 1 = lossy, 2 = lossless

uint32_t pad[5];    // padding for later use
};

// Internal, version-checked, entry point
WEBP_EXTERN VP8StatusCode WebPGetFeaturesInternal(
    const uint8_t*, size_t, WebPBitstreamFeatures*, int);

// Retrieve features from the bitstream. The *features structure is filled
// with information gathered from the bitstream.
// Returns VP8_STATUS_OK when the features are successfully retrieved. Returns
// VP8_STATUS_NOT_ENOUGH_DATA when more data is needed to retrieve the
// features from headers. Returns error in other cases.
static WEBP_INLINE VP8StatusCode WebPGetFeatures(
    const uint8_t* data, size_t data_size,
    WebPBitstreamFeatures* features) {
  return WebPGetFeaturesInternal(data, data_size, features,
                                 WEBP_DECODER_ABI_VERSION);
}

// Decoding options
struct WebPDecoderOptions {
  int bypass_filtering;               // if true, skip the in-loop filtering
  int no_fancy_upsampling;            // if true, use faster pointwise upsampler
  int use_cropping;                   // if true, cropping is applied _first_
  int crop_left, crop_top;            // top-left position for cropping.
                                      // Will be snapped to even values.
  int crop_width, crop_height;        // dimension of the cropping area
  int use_scaling;                    // if true, scaling is applied _afterward_
  int scaled_width, scaled_height;    // final resolution
  int use_threads;                    // if true, use multi-threaded decoding
  int dithering_strength;             // dithering strength (0=Off, 100=full)
  int flip;                           // flip output vertically
  int alpha_dithering_strength;       // alpha dithering strength in [0..100]

uint32_t pad[5];                    // padding for later use
};

// Main object storing the configuration for advanced decoding.
struct WebPDecoderConfig {
  WebPBitstreamFeatures input;  // Immutable bitstream features (optional)
  WebPDecBuffer output;         // Output buffer (can point to external mem)
  WebPDecoderOptions options;   // Decoding options
};

// Internal, version-checked, entry point
WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*, int);

// Initialize the configuration as empty. This function must always be
// called first, unless WebPGetFeatures() is to be called.
// Returns false in case of mismatched version.
static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
  return WebPInitDecoderConfigInternal(config, WEBP_DECODER_ABI_VERSION);
}

// Instantiate a new incremental decoder object with the requested
// configuration. The bitstream can be passed using 'data' and 'data_size'
// parameter, in which case the features will be parsed and stored into
// config->input. Otherwise, 'data' can be NULL and no parsing will occur.
// Note that 'config' can be NULL too, in which case a default configuration
// is used. If 'config' is not NULL, it must outlive the WebPIDecoder object
// as some references to its fields will be used. No internal copy of 'config'
// is made.
// The return WebPIDecoder object must always be deleted calling WebPIDelete().
// Returns NULL in case of error (and config->status will then reflect
// the error condition, if available).
WEBP_EXTERN WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size,
                                      WebPDecoderConfig* config);

// Non-incremental version. This version decodes the full data at once, taking
// 'config' into account. Returns decoding status (which should be VP8_STATUS_OK
// if the decoding was successful). Note that 'config' cannot be NULL.
WEBP_EXTERN VP8StatusCode WebPDecode(const uint8_t* data, size_t data_size,
                                     WebPDecoderConfig* config);

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_DECODE_H_ */
PK���\1��
�<�<demux.hnu�[���// 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.
// -----------------------------------------------------------------------------
//
// Demux API.
// Enables extraction of image and extended format data from WebP files.

// Code Example: Demuxing WebP data to extract all the frames, ICC profile
// and EXIF/XMP metadata.
/*
  WebPDemuxer* demux = WebPDemux(&webp_data);

uint32_t width = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
  uint32_t height = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
  // ... (Get information about the features present in the WebP file).
  uint32_t flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);

// ... (Iterate over all frames).
  WebPIterator iter;
  if (WebPDemuxGetFrame(demux, 1, &iter)) {
    do {
      // ... (Consume 'iter'; e.g. Decode 'iter.fragment' with WebPDecode(),
      // ... and get other frame properties like width, height, offsets etc.
      // ... see 'struct WebPIterator' below for more info).
    } while (WebPDemuxNextFrame(&iter));
    WebPDemuxReleaseIterator(&iter);
  }

// ... (Extract metadata).
  WebPChunkIterator chunk_iter;
  if (flags & ICCP_FLAG) WebPDemuxGetChunk(demux, "ICCP", 1, &chunk_iter);
  // ... (Consume the ICC profile in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  if (flags & EXIF_FLAG) WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter);
  // ... (Consume the EXIF metadata in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  if (flags & XMP_FLAG) WebPDemuxGetChunk(demux, "XMP ", 1, &chunk_iter);
  // ... (Consume the XMP metadata in 'chunk_iter.chunk').
  WebPDemuxReleaseChunkIterator(&chunk_iter);
  WebPDemuxDelete(demux);
*/

#ifndef WEBP_WEBP_DEMUX_H_
#define WEBP_WEBP_DEMUX_H_

#include "./decode.h"     // for WEBP_CSP_MODE
#include "./mux_types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define WEBP_DEMUX_ABI_VERSION 0x0107    // MAJOR(8b) + MINOR(8b)

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPDemuxState WebPDemuxState;
// typedef enum WebPFormatFeature WebPFormatFeature;
typedef struct WebPDemuxer WebPDemuxer;
typedef struct WebPIterator WebPIterator;
typedef struct WebPChunkIterator WebPChunkIterator;
typedef struct WebPAnimInfo WebPAnimInfo;
typedef struct WebPAnimDecoderOptions WebPAnimDecoderOptions;

//------------------------------------------------------------------------------

// Returns the version number of the demux library, packed in hexadecimal using
// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetDemuxVersion(void);

//------------------------------------------------------------------------------
// Life of a Demux object

typedef enum WebPDemuxState {
  WEBP_DEMUX_PARSE_ERROR    = -1,  // An error occurred while parsing.
  WEBP_DEMUX_PARSING_HEADER =  0,  // Not enough data to parse full header.
  WEBP_DEMUX_PARSED_HEADER  =  1,  // Header parsing complete,
                                   // data may be available.
  WEBP_DEMUX_DONE           =  2   // Entire file has been parsed.
} WebPDemuxState;

// Internal, version-checked, entry point
WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
    const WebPData*, int, WebPDemuxState*, int);

// Parses the full WebP file given by 'data'. For single images the WebP file
// header alone or the file header and the chunk header may be absent.
// Returns a WebPDemuxer object on successful parse, NULL otherwise.
static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
  return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
}

// Parses the possibly incomplete WebP file given by 'data'.
// If 'state' is non-NULL it will be set to indicate the status of the demuxer.
// Returns NULL in case of error or if there isn't enough data to start parsing;
// and a WebPDemuxer object on successful parse.
// Note that WebPDemuxer keeps internal pointers to 'data' memory segment.
// If this data is volatile, the demuxer object should be deleted (by calling
// WebPDemuxDelete()) and WebPDemuxPartial() called again on the new data.
// This is usually an inexpensive operation.
static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
    const WebPData* data, WebPDemuxState* state) {
  return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
}

// Frees memory associated with 'dmux'.
WEBP_EXTERN void WebPDemuxDelete(WebPDemuxer* dmux);

//------------------------------------------------------------------------------
// Data/information extraction.

typedef enum WebPFormatFeature {
  WEBP_FF_FORMAT_FLAGS,      // bit-wise combination of WebPFeatureFlags
                             // corresponding to the 'VP8X' chunk (if present).
  WEBP_FF_CANVAS_WIDTH,
  WEBP_FF_CANVAS_HEIGHT,
  WEBP_FF_LOOP_COUNT,        // only relevant for animated file
  WEBP_FF_BACKGROUND_COLOR,  // idem.
  WEBP_FF_FRAME_COUNT        // Number of frames present in the demux object.
                             // In case of a partial demux, this is the number
                             // of frames seen so far, with the last frame
                             // possibly being partial.
} WebPFormatFeature;

// Get the 'feature' value from the 'dmux'.
// NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
// returned a state > WEBP_DEMUX_PARSING_HEADER.
// If 'feature' is WEBP_FF_FORMAT_FLAGS, the returned value is a bit-wise
// combination of WebPFeatureFlags values.
// If 'feature' is WEBP_FF_LOOP_COUNT, WEBP_FF_BACKGROUND_COLOR, the returned
// value is only meaningful if the bitstream is animated.
WEBP_EXTERN uint32_t WebPDemuxGetI(
    const WebPDemuxer* dmux, WebPFormatFeature feature);

//------------------------------------------------------------------------------
// Frame iteration.

struct WebPIterator {
  int frame_num;
  int num_frames;          // equivalent to WEBP_FF_FRAME_COUNT.
  int x_offset, y_offset;  // offset relative to the canvas.
  int width, height;       // dimensions of this frame.
  int duration;            // display duration in milliseconds.
  WebPMuxAnimDispose dispose_method;  // dispose method for the frame.
  int complete;   // true if 'fragment' contains a full frame. partial images
                  // may still be decoded with the WebP incremental decoder.
  WebPData fragment;  // The frame given by 'frame_num'. Note for historical
                      // reasons this is called a fragment.
  int has_alpha;      // True if the frame contains transparency.
  WebPMuxAnimBlend blend_method;  // Blend operation for the frame.

uint32_t pad[2];         // padding for later use.
  void* private_;          // for internal use only.
};

// Retrieves frame 'frame_number' from 'dmux'.
// 'iter->fragment' points to the frame on return from this function.
// Setting 'frame_number' equal to 0 will return the last frame of the image.
// Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
// Call WebPDemuxReleaseIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of 'iter'.
WEBP_EXTERN int WebPDemuxGetFrame(
    const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);

// Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
// previous ('iter->frame_num' - 1) frame. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);

// Releases any memory associated with 'iter'.
// Must be called before any subsequent calls to WebPDemuxGetChunk() on the same
// iter. Also, must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN void WebPDemuxReleaseIterator(WebPIterator* iter);

//------------------------------------------------------------------------------
// Chunk iteration.

struct WebPChunkIterator {
  // The current and total number of chunks with the fourcc given to
  // WebPDemuxGetChunk().
  int chunk_num;
  int num_chunks;
  WebPData chunk;    // The payload of the chunk.

uint32_t pad[6];   // padding for later use
  void* private_;
};

// Retrieves the 'chunk_number' instance of the chunk with id 'fourcc' from
// 'dmux'.
// 'fourcc' is a character array containing the fourcc of the chunk to return,
// e.g., "ICCP", "XMP ", "EXIF", etc.
// Setting 'chunk_number' equal to 0 will return the last chunk in a set.
// Returns true if the chunk is found, false otherwise. Image related chunk
// payloads are accessed through WebPDemuxGetFrame() and related functions.
// Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
// NOTE: 'dmux' must persist for the lifetime of the iterator.
WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
                                  const char fourcc[4], int chunk_number,
                                  WebPChunkIterator* iter);

// Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
// ('iter->chunk_num' - 1) chunk. These functions do not loop.
// Returns true on success, false otherwise.
WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);

// Releases any memory associated with 'iter'.
// Must be called before destroying the associated WebPDemuxer with
// WebPDemuxDelete().
WEBP_EXTERN void WebPDemuxReleaseChunkIterator(WebPChunkIterator* iter);

//------------------------------------------------------------------------------
// WebPAnimDecoder API
//
// This API allows decoding (possibly) animated WebP images.
//
// Code Example:
/*
  WebPAnimDecoderOptions dec_options;
  WebPAnimDecoderOptionsInit(&dec_options);
  // Tune 'dec_options' as needed.
  WebPAnimDecoder* dec = WebPAnimDecoderNew(webp_data, &dec_options);
  WebPAnimInfo anim_info;
  WebPAnimDecoderGetInfo(dec, &anim_info);
  for (uint32_t i = 0; i < anim_info.loop_count; ++i) {
    while (WebPAnimDecoderHasMoreFrames(dec)) {
      uint8_t* buf;
      int timestamp;
      WebPAnimDecoderGetNext(dec, &buf, &timestamp);
      // ... (Render 'buf' based on 'timestamp').
      // ... (Do NOT free 'buf', as it is owned by 'dec').
    }
    WebPAnimDecoderReset(dec);
  }
  const WebPDemuxer* demuxer = WebPAnimDecoderGetDemuxer(dec);
  // ... (Do something using 'demuxer'; e.g. get EXIF/XMP/ICC data).
  WebPAnimDecoderDelete(dec);
*/

typedef struct WebPAnimDecoder WebPAnimDecoder;  // Main opaque object.

// Global options.
struct WebPAnimDecoderOptions {
  // Output colorspace. Only the following modes are supported:
  // MODE_RGBA, MODE_BGRA, MODE_rgbA and MODE_bgrA.
  WEBP_CSP_MODE color_mode;
  int use_threads;           // If true, use multi-threaded decoding.
  uint32_t padding[7];       // Padding for later use.
};

// Internal, version-checked, entry point.
WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
    WebPAnimDecoderOptions*, int);

// Should always be called, to initialize a fresh WebPAnimDecoderOptions
// structure before modification. Returns false in case of version mismatch.
// WebPAnimDecoderOptionsInit() must have succeeded before using the
// 'dec_options' object.
static WEBP_INLINE int WebPAnimDecoderOptionsInit(
    WebPAnimDecoderOptions* dec_options) {
  return WebPAnimDecoderOptionsInitInternal(dec_options,
                                            WEBP_DEMUX_ABI_VERSION);
}

// Internal, version-checked, entry point.
WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
    const WebPData*, const WebPAnimDecoderOptions*, int);

// Creates and initializes a WebPAnimDecoder object.
// Parameters:
//   webp_data - (in) WebP bitstream. This should remain unchanged during the
//                    lifetime of the output WebPAnimDecoder object.
//   dec_options - (in) decoding options. Can be passed NULL to choose
//                      reasonable defaults (in particular, color mode MODE_RGBA
//                      will be picked).
// Returns:
//   A pointer to the newly created WebPAnimDecoder object, or NULL in case of
//   parsing error, invalid option or memory error.
static WEBP_INLINE WebPAnimDecoder* WebPAnimDecoderNew(
    const WebPData* webp_data, const WebPAnimDecoderOptions* dec_options) {
  return WebPAnimDecoderNewInternal(webp_data, dec_options,
                                    WEBP_DEMUX_ABI_VERSION);
}

// Global information about the animation..
struct WebPAnimInfo {
  uint32_t canvas_width;
  uint32_t canvas_height;
  uint32_t loop_count;
  uint32_t bgcolor;
  uint32_t frame_count;
  uint32_t pad[4];   // padding for later use
};

// Get global information about the animation.
// Parameters:
//   dec - (in) decoder instance to get information from.
//   info - (out) global information fetched from the animation.
// Returns:
//   True on success.
WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
                                       WebPAnimInfo* info);

// Fetch the next frame from 'dec' based on options supplied to
// WebPAnimDecoderNew(). This will be a fully reconstructed canvas of size
// 'canvas_width * 4 * canvas_height', and not just the frame sub-rectangle. The
// returned buffer 'buf' is valid only until the next call to
// WebPAnimDecoderGetNext(), WebPAnimDecoderReset() or WebPAnimDecoderDelete().
// Parameters:
//   dec - (in/out) decoder instance from which the next frame is to be fetched.
//   buf - (out) decoded frame.
//   timestamp - (out) timestamp of the frame in milliseconds.
// Returns:
//   False if any of the arguments are NULL, or if there is a parsing or
//   decoding error, or if there are no more frames. Otherwise, returns true.
WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
                                       uint8_t** buf, int* timestamp);

// Check if there are more frames left to decode.
// Parameters:
//   dec - (in) decoder instance to be checked.
// Returns:
//   True if 'dec' is not NULL and some frames are yet to be decoded.
//   Otherwise, returns false.
WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);

// Resets the WebPAnimDecoder object, so that next call to
// WebPAnimDecoderGetNext() will restart decoding from 1st frame. This would be
// helpful when all frames need to be decoded multiple times (e.g.
// info.loop_count times) without destroying and recreating the 'dec' object.
// Parameters:
//   dec - (in/out) decoder instance to be reset
WEBP_EXTERN void WebPAnimDecoderReset(WebPAnimDecoder* dec);

// Grab the internal demuxer object.
// Getting the demuxer object can be useful if one wants to use operations only
// available through demuxer; e.g. to get XMP/EXIF/ICC metadata. The returned
// demuxer object is owned by 'dec' and is valid only until the next call to
// WebPAnimDecoderDelete().
//
// Parameters:
//   dec - (in) decoder instance from which the demuxer object is to be fetched.
WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
    const WebPAnimDecoder* dec);

// Deletes the WebPAnimDecoder object.
// Parameters:
//   dec - (in/out) decoder instance to be deleted
WEBP_EXTERN void WebPAnimDecoderDelete(WebPAnimDecoder* dec);

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_DEMUX_H_ */
PK���\��k�YkYkencode.hnu�[���// 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: main interface
//
// Author: Skal (pascal.massimino@gmail.com)

#ifndef WEBP_WEBP_ENCODE_H_
#define WEBP_WEBP_ENCODE_H_

#include "./types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define WEBP_ENCODER_ABI_VERSION 0x020e    // MAJOR(8b) + MINOR(8b)

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPImageHint WebPImageHint;
// typedef enum WebPEncCSP WebPEncCSP;
// typedef enum WebPPreset WebPPreset;
// typedef enum WebPEncodingError WebPEncodingError;
typedef struct WebPConfig WebPConfig;
typedef struct WebPPicture WebPPicture;   // main structure for I/O
typedef struct WebPAuxStats WebPAuxStats;
typedef struct WebPMemoryWriter WebPMemoryWriter;

// Return the encoder's version number, packed in hexadecimal using 8bits for
// each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetEncoderVersion(void);

//------------------------------------------------------------------------------
// One-stop-shop call! No questions asked:

// Returns the size of the compressed data (pointed to by *output), or 0 if
// an error occurred. The compressed data must be released by the caller
// using the call 'WebPFree(*output)'.
// These functions compress using the lossy format, and the quality_factor
// can go from 0 (smaller output, lower quality) to 100 (best quality,
// larger output).
WEBP_EXTERN size_t WebPEncodeRGB(const uint8_t* rgb,
                                 int width, int height, int stride,
                                 float quality_factor, uint8_t** output);
WEBP_EXTERN size_t WebPEncodeBGR(const uint8_t* bgr,
                                 int width, int height, int stride,
                                 float quality_factor, uint8_t** output);
WEBP_EXTERN size_t WebPEncodeRGBA(const uint8_t* rgba,
                                  int width, int height, int stride,
                                  float quality_factor, uint8_t** output);
WEBP_EXTERN size_t WebPEncodeBGRA(const uint8_t* bgra,
                                  int width, int height, int stride,
                                  float quality_factor, uint8_t** output);

// These functions are the equivalent of the above, but compressing in a
// lossless manner. Files are usually larger than lossy format, but will
// not suffer any compression loss.
WEBP_EXTERN size_t WebPEncodeLosslessRGB(const uint8_t* rgb,
                                         int width, int height, int stride,
                                         uint8_t** output);
WEBP_EXTERN size_t WebPEncodeLosslessBGR(const uint8_t* bgr,
                                         int width, int height, int stride,
                                         uint8_t** output);
WEBP_EXTERN size_t WebPEncodeLosslessRGBA(const uint8_t* rgba,
                                          int width, int height, int stride,
                                          uint8_t** output);
WEBP_EXTERN size_t WebPEncodeLosslessBGRA(const uint8_t* bgra,
                                          int width, int height, int stride,
                                          uint8_t** output);

// Releases memory returned by the WebPEncode*() functions above.
WEBP_EXTERN void WebPFree(void* ptr);

//------------------------------------------------------------------------------
// Coding parameters

// Image characteristics hint for the underlying encoder.
typedef enum WebPImageHint {
  WEBP_HINT_DEFAULT = 0,  // default preset.
  WEBP_HINT_PICTURE,      // digital picture, like portrait, inner shot
  WEBP_HINT_PHOTO,        // outdoor photograph, with natural lighting
  WEBP_HINT_GRAPH,        // Discrete tone image (graph, map-tile etc).
  WEBP_HINT_LAST
} WebPImageHint;

// Compression parameters.
struct WebPConfig {
  int lossless;           // Lossless encoding (0=lossy(default), 1=lossless).
  float quality;          // between 0 and 100. For lossy, 0 gives the smallest
                          // size and 100 the largest. For lossless, this
                          // parameter is the amount of effort put into the
                          // compression: 0 is the fastest but gives larger
                          // files compared to the slowest, but best, 100.
  int method;             // quality/speed trade-off (0=fast, 6=slower-better)

WebPImageHint image_hint;  // Hint for image type (lossless only for now).

int target_size;        // if non-zero, set the desired target size in bytes.
                          // Takes precedence over the 'compression' parameter.
  float target_PSNR;      // if non-zero, specifies the minimal distortion to
                          // try to achieve. Takes precedence over target_size.
  int segments;           // maximum number of segments to use, in [1..4]
  int sns_strength;       // Spatial Noise Shaping. 0=off, 100=maximum.
  int filter_strength;    // range: [0 = off .. 100 = strongest]
  int filter_sharpness;   // range: [0 = off .. 7 = least sharp]
  int filter_type;        // filtering type: 0 = simple, 1 = strong (only used
                          // if filter_strength > 0 or autofilter > 0)
  int autofilter;         // Auto adjust filter's strength [0 = off, 1 = on]
  int alpha_compression;  // Algorithm for encoding the alpha plane (0 = none,
                          // 1 = compressed with WebP lossless). Default is 1.
  int alpha_filtering;    // Predictive filtering method for alpha plane.
                          //  0: none, 1: fast, 2: best. Default if 1.
  int alpha_quality;      // Between 0 (smallest size) and 100 (lossless).
                          // Default is 100.
  int pass;               // number of entropy-analysis passes (in [1..10]).

int show_compressed;    // if true, export the compressed picture back.
                          // In-loop filtering is not applied.
  int preprocessing;      // preprocessing filter:
                          // 0=none, 1=segment-smooth, 2=pseudo-random dithering
  int partitions;         // log2(number of token partitions) in [0..3]. Default
                          // is set to 0 for easier progressive decoding.
  int partition_limit;    // quality degradation allowed to fit the 512k limit
                          // on prediction modes coding (0: no degradation,
                          // 100: maximum possible degradation).
  int emulate_jpeg_size;  // If true, compression parameters will be remapped
                          // to better match the expected output size from
                          // JPEG compression. Generally, the output size will
                          // be similar but the degradation will be lower.
  int thread_level;       // If non-zero, try and use multi-threaded encoding.
  int low_memory;         // If set, reduce memory usage (but increase CPU use).

int near_lossless;      // Near lossless encoding [0 = max loss .. 100 = off
                          // (default)].
  int exact;              // if non-zero, preserve the exact RGB values under
                          // transparent area. Otherwise, discard this invisible
                          // RGB information for better compression. The default
                          // value is 0.

int use_delta_palette;  // reserved for future lossless feature
  int use_sharp_yuv;      // if needed, use sharp (and slow) RGB->YUV conversion

uint32_t pad[2];        // padding for later use
};

// Enumerate some predefined settings for WebPConfig, depending on the type
// of source picture. These presets are used when calling WebPConfigPreset().
typedef enum WebPPreset {
  WEBP_PRESET_DEFAULT = 0,  // default preset.
  WEBP_PRESET_PICTURE,      // digital picture, like portrait, inner shot
  WEBP_PRESET_PHOTO,        // outdoor photograph, with natural lighting
  WEBP_PRESET_DRAWING,      // hand or line drawing, with high-contrast details
  WEBP_PRESET_ICON,         // small-sized colorful images
  WEBP_PRESET_TEXT          // text-like
} WebPPreset;

// Internal, version-checked, entry point
WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);

// Should always be called, to initialize a fresh WebPConfig structure before
// modification. Returns false in case of version mismatch. WebPConfigInit()
// must have succeeded before using the 'config' object.
// Note that the default values are lossless=0 and quality=75.
static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
  return WebPConfigInitInternal(config, WEBP_PRESET_DEFAULT, 75.f,
                                WEBP_ENCODER_ABI_VERSION);
}

// This function will initialize the configuration according to a predefined
// set of parameters (referred to by 'preset') and a given quality factor.
// This function can be called as a replacement to WebPConfigInit(). Will
// return false in case of error.
static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
                                        WebPPreset preset, float quality) {
  return WebPConfigInitInternal(config, preset, quality,
                                WEBP_ENCODER_ABI_VERSION);
}

// Activate the lossless compression mode with the desired efficiency level
// between 0 (fastest, lowest compression) and 9 (slower, best compression).
// A good default level is '6', providing a fair tradeoff between compression
// speed and final compressed size.
// This function will overwrite several fields from config: 'method', 'quality'
// and 'lossless'. Returns false in case of parameter error.
WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config, int level);

// Returns true if 'config' is non-NULL and all configuration parameters are
// within their valid ranges.
WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);

//------------------------------------------------------------------------------
// Input / Output
// Structure for storing auxiliary statistics.

struct WebPAuxStats {
  int coded_size;         // final size

float PSNR[5];          // peak-signal-to-noise ratio for Y/U/V/All/Alpha
  int block_count[3];     // number of intra4/intra16/skipped macroblocks
  int header_bytes[2];    // approximate number of bytes spent for header
                          // and mode-partition #0
  int residual_bytes[3][4];  // approximate number of bytes spent for
                             // DC/AC/uv coefficients for each (0..3) segments.
  int segment_size[4];    // number of macroblocks in each segments
  int segment_quant[4];   // quantizer values for each segments
  int segment_level[4];   // filtering strength for each segments [0..63]

int alpha_data_size;    // size of the transparency data
  int layer_data_size;    // size of the enhancement layer data

// lossless encoder statistics
  uint32_t lossless_features;  // bit0:predictor bit1:cross-color transform
                               // bit2:subtract-green bit3:color indexing
  int histogram_bits;          // number of precision bits of histogram
  int transform_bits;          // precision bits for transform
  int cache_bits;              // number of bits for color cache lookup
  int palette_size;            // number of color in palette, if used
  int lossless_size;           // final lossless size
  int lossless_hdr_size;       // lossless header (transform, huffman etc) size
  int lossless_data_size;      // lossless image data size

uint32_t pad[2];        // padding for later use
};

// Signature for output function. Should return true if writing was successful.
// data/data_size is the segment of data to write, and 'picture' is for
// reference (and so one can make use of picture->custom_ptr).
typedef int (*WebPWriterFunction)(const uint8_t* data, size_t data_size,
                                  const WebPPicture* picture);

// WebPMemoryWrite: a special WebPWriterFunction that writes to memory using
// the following WebPMemoryWriter object (to be set as a custom_ptr).
struct WebPMemoryWriter {
  uint8_t* mem;       // final buffer (of size 'max_size', larger than 'size').
  size_t   size;      // final size
  size_t   max_size;  // total capacity
  uint32_t pad[1];    // padding for later use
};

// The following must be called first before any use.
WEBP_EXTERN void WebPMemoryWriterInit(WebPMemoryWriter* writer);

// The following must be called to deallocate writer->mem memory. The 'writer'
// object itself is not deallocated.
WEBP_EXTERN void WebPMemoryWriterClear(WebPMemoryWriter* writer);
// The custom writer to be used with WebPMemoryWriter as custom_ptr. Upon
// completion, writer.mem and writer.size will hold the coded data.
// writer.mem must be freed by calling WebPMemoryWriterClear.
WEBP_EXTERN int WebPMemoryWrite(const uint8_t* data, size_t data_size,
                                const WebPPicture* picture);

// Progress hook, called from time to time to report progress. It can return
// false to request an abort of the encoding process, or true otherwise if
// everything is OK.
typedef int (*WebPProgressHook)(int percent, const WebPPicture* picture);

// Color spaces.
typedef enum WebPEncCSP {
  // chroma sampling
  WEBP_YUV420  = 0,        // 4:2:0
  WEBP_YUV420A = 4,        // alpha channel variant
  WEBP_CSP_UV_MASK = 3,    // bit-mask to get the UV sampling factors
  WEBP_CSP_ALPHA_BIT = 4   // bit that is set if alpha is present
} WebPEncCSP;

// Encoding error conditions.
typedef enum WebPEncodingError {
  VP8_ENC_OK = 0,
  VP8_ENC_ERROR_OUT_OF_MEMORY,            // memory error allocating objects
  VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY,  // memory error while flushing bits
  VP8_ENC_ERROR_NULL_PARAMETER,           // a pointer parameter is NULL
  VP8_ENC_ERROR_INVALID_CONFIGURATION,    // configuration is invalid
  VP8_ENC_ERROR_BAD_DIMENSION,            // picture has invalid width/height
  VP8_ENC_ERROR_PARTITION0_OVERFLOW,      // partition is bigger than 512k
  VP8_ENC_ERROR_PARTITION_OVERFLOW,       // partition is bigger than 16M
  VP8_ENC_ERROR_BAD_WRITE,                // error while flushing bytes
  VP8_ENC_ERROR_FILE_TOO_BIG,             // file is bigger than 4G
  VP8_ENC_ERROR_USER_ABORT,               // abort request by user
  VP8_ENC_ERROR_LAST                      // list terminator. always last.
} WebPEncodingError;

// maximum width/height allowed (inclusive), in pixels
#define WEBP_MAX_DIMENSION 16383

// Main exchange structure (input samples, output bytes, statistics)
struct WebPPicture {
  //   INPUT
  //////////////
  // Main flag for encoder selecting between ARGB or YUV input.
  // It is recommended to use ARGB input (*argb, argb_stride) for lossless
  // compression, and YUV input (*y, *u, *v, etc.) for lossy compression
  // since these are the respective native colorspace for these formats.
  int use_argb;

// YUV input (mostly used for input to lossy compression)
  WebPEncCSP colorspace;     // colorspace: should be YUV420 for now (=Y'CbCr).
  int width, height;         // dimensions (less or equal to WEBP_MAX_DIMENSION)
  uint8_t *y, *u, *v;        // pointers to luma/chroma planes.
  int y_stride, uv_stride;   // luma/chroma strides.
  uint8_t* a;                // pointer to the alpha plane
  int a_stride;              // stride of the alpha plane
  uint32_t pad1[2];          // padding for later use

// ARGB input (mostly used for input to lossless compression)
  uint32_t* argb;            // Pointer to argb (32 bit) plane.
  int argb_stride;           // This is stride in pixels units, not bytes.
  uint32_t pad2[3];          // padding for later use

//   OUTPUT
  ///////////////
  // Byte-emission hook, to store compressed bytes as they are ready.
  WebPWriterFunction writer;  // can be NULL
  void* custom_ptr;           // can be used by the writer.

// map for extra information (only for lossy compression mode)
  int extra_info_type;    // 1: intra type, 2: segment, 3: quant
                          // 4: intra-16 prediction mode,
                          // 5: chroma prediction mode,
                          // 6: bit cost, 7: distortion
  uint8_t* extra_info;    // if not NULL, points to an array of size
                          // ((width + 15) / 16) * ((height + 15) / 16) that
                          // will be filled with a macroblock map, depending
                          // on extra_info_type.

//   STATS AND REPORTS
  ///////////////////////////
  // Pointer to side statistics (updated only if not NULL)
  WebPAuxStats* stats;

// Error code for the latest error encountered during encoding
  WebPEncodingError error_code;

// If not NULL, report progress during encoding.
  WebPProgressHook progress_hook;

void* user_data;        // this field is free to be set to any value and
                          // used during callbacks (like progress-report e.g.).

uint32_t pad3[3];       // padding for later use

// Unused for now
  uint8_t *pad4, *pad5;
  uint32_t pad6[8];       // padding for later use

// PRIVATE FIELDS
  ////////////////////
  void* memory_;          // row chunk of memory for yuva planes
  void* memory_argb_;     // and for argb too.
  void* pad7[2];          // padding for later use
};

// Internal, version-checked, entry point
WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);

// Should always be called, to initialize the structure. Returns false in case
// of version mismatch. WebPPictureInit() must have succeeded before using the
// 'picture' object.
// Note that, by default, use_argb is false and colorspace is WEBP_YUV420.
static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
  return WebPPictureInitInternal(picture, WEBP_ENCODER_ABI_VERSION);
}

//------------------------------------------------------------------------------
// WebPPicture utils

// Convenience allocation / deallocation based on picture->width/height:
// Allocate y/u/v buffers as per colorspace/width/height specification.
// Note! This function will free the previous buffer if needed.
// Returns false in case of memory error.
WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);

// Release the memory allocated by WebPPictureAlloc() or WebPPictureImport*().
// Note that this function does _not_ free the memory used by the 'picture'
// object itself.
// Besides memory (which is reclaimed) all other fields of 'picture' are
// preserved.
WEBP_EXTERN void WebPPictureFree(WebPPicture* picture);

// Copy the pixels of *src into *dst, using WebPPictureAlloc. Upon return, *dst
// will fully own the copied pixels (this is not a view). The 'dst' picture need
// not be initialized as its content is overwritten.
// Returns false in case of memory allocation error.
WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);

// Compute the single distortion for packed planes of samples.
// 'src' will be compared to 'ref', and the raw distortion stored into
// '*distortion'. The refined metric (log(MSE), log(1 - ssim),...' will be
// stored in '*result'.
// 'x_step' is the horizontal stride (in bytes) between samples.
// 'src/ref_stride' is the byte distance between rows.
// Returns false in case of error (bad parameter, memory allocation error, ...).
WEBP_EXTERN int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
                                    const uint8_t* ref, size_t ref_stride,
                                    int width, int height,
                                    size_t x_step,
                                    int type,   // 0 = PSNR, 1 = SSIM, 2 = LSIM
                                    float* distortion, float* result);

// Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
// are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
// always performed using ARGB samples. Hence if the input is YUV(A), the
// picture will be internally converted to ARGB (just for the measurement).
// Warning: this function is rather CPU-intensive.
WEBP_EXTERN int WebPPictureDistortion(
    const WebPPicture* src, const WebPPicture* ref,
    int metric_type,           // 0 = PSNR, 1 = SSIM, 2 = LSIM
    float result[5]);

// self-crops a picture to the rectangle defined by top/left/width/height.
// Returns false in case of memory allocation error, or if the rectangle is
// outside of the source picture.
// The rectangle for the view is defined by the top-left corner pixel
// coordinates (left, top) as well as its width and height. This rectangle
// must be fully be comprised inside the 'src' source picture. If the source
// picture uses the YUV420 colorspace, the top and left coordinates will be
// snapped to even values.
WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
                                int left, int top, int width, int height);

// Extracts a view from 'src' picture into 'dst'. The rectangle for the view
// is defined by the top-left corner pixel coordinates (left, top) as well
// as its width and height. This rectangle must be fully be comprised inside
// the 'src' source picture. If the source picture uses the YUV420 colorspace,
// the top and left coordinates will be snapped to even values.
// Picture 'src' must out-live 'dst' picture. Self-extraction of view is allowed
// ('src' equal to 'dst') as a mean of fast-cropping (but note that doing so,
// the original dimension will be lost). Picture 'dst' need not be initialized
// with WebPPictureInit() if it is different from 'src', since its content will
// be overwritten.
// Returns false in case of memory allocation error or invalid parameters.
WEBP_EXTERN int WebPPictureView(const WebPPicture* src,
                                int left, int top, int width, int height,
                                WebPPicture* dst);

// Returns true if the 'picture' is actually a view and therefore does
// not own the memory for pixels.
WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture);

// Rescale a picture to new dimension width x height.
// If either 'width' or 'height' (but not both) is 0 the corresponding
// dimension will be calculated preserving the aspect ratio.
// No gamma correction is applied.
// Returns false in case of error (invalid parameter or insufficient memory).
WEBP_EXTERN int WebPPictureRescale(WebPPicture* pic, int width, int height);

// Colorspace conversion function to import RGB samples.
// Previous buffer will be free'd, if any.
// *rgb buffer should have a size of at least height * rgb_stride.
// Returns false in case of memory error.
WEBP_EXTERN int WebPPictureImportRGB(
    WebPPicture* picture, const uint8_t* rgb, int rgb_stride);
// Same, but for RGBA buffer.
WEBP_EXTERN int WebPPictureImportRGBA(
    WebPPicture* picture, const uint8_t* rgba, int rgba_stride);
// Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format
// input buffer ignoring the alpha channel. Avoids needing to copy the data
// to a temporary 24-bit RGB buffer to import the RGB only.
WEBP_EXTERN int WebPPictureImportRGBX(
    WebPPicture* picture, const uint8_t* rgbx, int rgbx_stride);

// Variants of the above, but taking BGR(A|X) input.
WEBP_EXTERN int WebPPictureImportBGR(
    WebPPicture* picture, const uint8_t* bgr, int bgr_stride);
WEBP_EXTERN int WebPPictureImportBGRA(
    WebPPicture* picture, const uint8_t* bgra, int bgra_stride);
WEBP_EXTERN int WebPPictureImportBGRX(
    WebPPicture* picture, const uint8_t* bgrx, int bgrx_stride);

// Converts picture->argb data to the YUV420A format. The 'colorspace'
// parameter is deprecated and should be equal to WEBP_YUV420.
// Upon return, picture->use_argb is set to false. The presence of real
// non-opaque transparent values is detected, and 'colorspace' will be
// adjusted accordingly. Note that this method is lossy.
// Returns false in case of error.
WEBP_EXTERN int WebPPictureARGBToYUVA(WebPPicture* picture,
                                      WebPEncCSP /*colorspace = WEBP_YUV420*/);

// Same as WebPPictureARGBToYUVA(), but the conversion is done using
// pseudo-random dithering with a strength 'dithering' between
// 0.0 (no dithering) and 1.0 (maximum dithering). This is useful
// for photographic picture.
WEBP_EXTERN int WebPPictureARGBToYUVADithered(
    WebPPicture* picture, WebPEncCSP colorspace, float dithering);

// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion.
// Downsampling is handled with extra care in case of color clipping. This
// method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better
// and sharper YUV representation.
// Returns false in case of error.
WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
// kept for backward compatibility:
WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);

// Converts picture->yuv to picture->argb and sets picture->use_argb to true.
// The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to
// ARGB incurs a small loss too.
// Note that the use of this colorspace is discouraged if one has access to the
// raw ARGB samples, since using YUV420 is comparatively lossy.
// Returns false in case of error.
WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);

// Helper function: given a width x height plane of RGBA or YUV(A) samples
// clean-up or smoothen the YUV or RGB samples under fully transparent area,
// to help compressibility (no guarantee, though).
WEBP_EXTERN void WebPCleanupTransparentArea(WebPPicture* picture);

// Scan the picture 'picture' for the presence of non fully opaque alpha values.
// Returns true in such case. Otherwise returns false (indicating that the
// alpha plane can be ignored altogether e.g.).
WEBP_EXTERN int WebPPictureHasTransparency(const WebPPicture* picture);

// Remove the transparency information (if present) by blending the color with
// the background color 'background_rgb' (specified as 24bit RGB triplet).
// After this call, all alpha values are reset to 0xff.
WEBP_EXTERN void WebPBlendAlpha(WebPPicture* pic, uint32_t background_rgb);

//------------------------------------------------------------------------------
// Main call

// Main encoding call, after config and picture have been initialized.
// 'picture' must be less than 16384x16384 in dimension (cf WEBP_MAX_DIMENSION),
// and the 'config' object must be a valid one.
// Returns false in case of error, true otherwise.
// In case of error, picture->error_code is updated accordingly.
// 'picture' can hold the source samples in both YUV(A) or ARGB input, depending
// on the value of 'picture->use_argb'. It is highly recommended to use
// the former for lossy encoding, and the latter for lossless encoding
// (when config.lossless is true). Automatic conversion from one format to
// another is provided but they both incur some loss.
WEBP_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture);

//------------------------------------------------------------------------------

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_ENCODE_H_ */
PK���\ {�(Y(Ymux.hnu�[���// 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.
// -----------------------------------------------------------------------------
//
//  RIFF container manipulation and encoding for WebP images.
//
// Authors: Urvang (urvang@google.com)
//          Vikas (vikasa@google.com)

#ifndef WEBP_WEBP_MUX_H_
#define WEBP_WEBP_MUX_H_

#include "./mux_types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define WEBP_MUX_ABI_VERSION 0x0108        // MAJOR(8b) + MINOR(8b)

//------------------------------------------------------------------------------
// Mux API
//
// This API allows manipulation of WebP container images containing features
// like color profile, metadata, animation.
//
// Code Example#1: Create a WebPMux object with image data, color profile and
// XMP metadata.
/*
  int copy_data = 0;
  WebPMux* mux = WebPMuxNew();
  // ... (Prepare image data).
  WebPMuxSetImage(mux, &image, copy_data);
  // ... (Prepare ICCP color profile data).
  WebPMuxSetChunk(mux, "ICCP", &icc_profile, copy_data);
  // ... (Prepare XMP metadata).
  WebPMuxSetChunk(mux, "XMP ", &xmp, copy_data);
  // Get data from mux in WebP RIFF format.
  WebPMuxAssemble(mux, &output_data);
  WebPMuxDelete(mux);
  // ... (Consume output_data; e.g. write output_data.bytes to file).
  WebPDataClear(&output_data);
*/

// Code Example#2: Get image and color profile data from a WebP file.
/*
  int copy_data = 0;
  // ... (Read data from file).
  WebPMux* mux = WebPMuxCreate(&data, copy_data);
  WebPMuxGetFrame(mux, 1, &image);
  // ... (Consume image; e.g. call WebPDecode() to decode the data).
  WebPMuxGetChunk(mux, "ICCP", &icc_profile);
  // ... (Consume icc_data).
  WebPMuxDelete(mux);
  free(data);
*/

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPMuxError WebPMuxError;
// typedef enum WebPChunkId WebPChunkId;
typedef struct WebPMux WebPMux;   // main opaque object.
typedef struct WebPMuxFrameInfo WebPMuxFrameInfo;
typedef struct WebPMuxAnimParams WebPMuxAnimParams;
typedef struct WebPAnimEncoderOptions WebPAnimEncoderOptions;

// Error codes
typedef enum WebPMuxError {
  WEBP_MUX_OK                 =  1,
  WEBP_MUX_NOT_FOUND          =  0,
  WEBP_MUX_INVALID_ARGUMENT   = -1,
  WEBP_MUX_BAD_DATA           = -2,
  WEBP_MUX_MEMORY_ERROR       = -3,
  WEBP_MUX_NOT_ENOUGH_DATA    = -4
} WebPMuxError;

// IDs for different types of chunks.
typedef enum WebPChunkId {
  WEBP_CHUNK_VP8X,        // VP8X
  WEBP_CHUNK_ICCP,        // ICCP
  WEBP_CHUNK_ANIM,        // ANIM
  WEBP_CHUNK_ANMF,        // ANMF
  WEBP_CHUNK_DEPRECATED,  // (deprecated from FRGM)
  WEBP_CHUNK_ALPHA,       // ALPH
  WEBP_CHUNK_IMAGE,       // VP8/VP8L
  WEBP_CHUNK_EXIF,        // EXIF
  WEBP_CHUNK_XMP,         // XMP
  WEBP_CHUNK_UNKNOWN,     // Other chunks.
  WEBP_CHUNK_NIL
} WebPChunkId;

//------------------------------------------------------------------------------

// Returns the version number of the mux library, packed in hexadecimal using
// 8bits for each of major/minor/revision. E.g: v2.5.7 is 0x020507.
WEBP_EXTERN int WebPGetMuxVersion(void);

//------------------------------------------------------------------------------
// Life of a Mux object

// Internal, version-checked, entry point
WEBP_EXTERN WebPMux* WebPNewInternal(int);

// Creates an empty mux object.
// Returns:
//   A pointer to the newly created empty mux object.
//   Or NULL in case of memory error.
static WEBP_INLINE WebPMux* WebPMuxNew(void) {
  return WebPNewInternal(WEBP_MUX_ABI_VERSION);
}

// Deletes the mux object.
// Parameters:
//   mux - (in/out) object to be deleted
WEBP_EXTERN void WebPMuxDelete(WebPMux* mux);

//------------------------------------------------------------------------------
// Mux creation.

// Internal, version-checked, entry point
WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int, int);

// Creates a mux object from raw data given in WebP RIFF format.
// Parameters:
//   bitstream - (in) the bitstream data in WebP RIFF format
//   copy_data - (in) value 1 indicates given data WILL be copied to the mux
//               object and value 0 indicates data will NOT be copied.
// Returns:
//   A pointer to the mux object created from given data - on success.
//   NULL - In case of invalid data or memory error.
static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
                                          int copy_data) {
  return WebPMuxCreateInternal(bitstream, copy_data, WEBP_MUX_ABI_VERSION);
}

//------------------------------------------------------------------------------
// Non-image chunks.

// Note: Only non-image related chunks should be managed through chunk APIs.
// (Image related chunks are: "ANMF", "VP8 ", "VP8L" and "ALPH").
// To add, get and delete images, use WebPMuxSetImage(), WebPMuxPushFrame(),
// WebPMuxGetFrame() and WebPMuxDeleteFrame().

// Adds a chunk with id 'fourcc' and data 'chunk_data' in the mux object.
// Any existing chunk(s) with the same id will be removed.
// Parameters:
//   mux - (in/out) object to which the chunk is to be added
//   fourcc - (in) a character array containing the fourcc of the given chunk;
//                 e.g., "ICCP", "XMP ", "EXIF" etc.
//   chunk_data - (in) the chunk data to be added
//   copy_data - (in) value 1 indicates given data WILL be copied to the mux
//               object and value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux, fourcc or chunk_data is NULL
//                               or if fourcc corresponds to an image chunk.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxSetChunk(
    WebPMux* mux, const char fourcc[4], const WebPData* chunk_data,
    int copy_data);

// Gets a reference to the data of the chunk with id 'fourcc' in the mux object.
// The caller should NOT free the returned data.
// Parameters:
//   mux - (in) object from which the chunk data is to be fetched
//   fourcc - (in) a character array containing the fourcc of the chunk;
//                 e.g., "ICCP", "XMP ", "EXIF" etc.
//   chunk_data - (out) returned chunk data
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux, fourcc or chunk_data is NULL
//                               or if fourcc corresponds to an image chunk.
//   WEBP_MUX_NOT_FOUND - If mux does not contain a chunk with the given id.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxGetChunk(
    const WebPMux* mux, const char fourcc[4], WebPData* chunk_data);

// Deletes the chunk with the given 'fourcc' from the mux object.
// Parameters:
//   mux - (in/out) object from which the chunk is to be deleted
//   fourcc - (in) a character array containing the fourcc of the chunk;
//                 e.g., "ICCP", "XMP ", "EXIF" etc.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or fourcc is NULL
//                               or if fourcc corresponds to an image chunk.
//   WEBP_MUX_NOT_FOUND - If mux does not contain a chunk with the given fourcc.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxDeleteChunk(
    WebPMux* mux, const char fourcc[4]);

//------------------------------------------------------------------------------
// Images.

// Encapsulates data about a single frame.
struct WebPMuxFrameInfo {
  WebPData    bitstream;  // image data: can be a raw VP8/VP8L bitstream
                          // or a single-image WebP file.
  int         x_offset;   // x-offset of the frame.
  int         y_offset;   // y-offset of the frame.
  int         duration;   // duration of the frame (in milliseconds).

WebPChunkId id;         // frame type: should be one of WEBP_CHUNK_ANMF
                          // or WEBP_CHUNK_IMAGE
  WebPMuxAnimDispose dispose_method;  // Disposal method for the frame.
  WebPMuxAnimBlend   blend_method;    // Blend operation for the frame.
  uint32_t    pad[1];     // padding for later use
};

// Sets the (non-animated) image in the mux object.
// Note: Any existing images (including frames) will be removed.
// Parameters:
//   mux - (in/out) object in which the image is to be set
//   bitstream - (in) can be a raw VP8/VP8L bitstream or a single-image
//               WebP file (non-animated)
//   copy_data - (in) value 1 indicates given data WILL be copied to the mux
//               object and value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxSetImage(
    WebPMux* mux, const WebPData* bitstream, int copy_data);

// Adds a frame at the end of the mux object.
// Notes: (1) frame.id should be WEBP_CHUNK_ANMF
//        (2) For setting a non-animated image, use WebPMuxSetImage() instead.
//        (3) Type of frame being pushed must be same as the frames in mux.
//        (4) As WebP only supports even offsets, any odd offset will be snapped
//            to an even location using: offset &= ~1
// Parameters:
//   mux - (in/out) object to which the frame is to be added
//   frame - (in) frame data.
//   copy_data - (in) value 1 indicates given data WILL be copied to the mux
//               object and value 0 indicates data will NOT be copied.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or frame is NULL
//                               or if content of 'frame' is invalid.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxPushFrame(
    WebPMux* mux, const WebPMuxFrameInfo* frame, int copy_data);

// Gets the nth frame from the mux object.
// The content of 'frame->bitstream' is allocated using malloc(), and NOT
// owned by the 'mux' object. It MUST be deallocated by the caller by calling
// WebPDataClear().
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in) object from which the info is to be fetched
//   nth - (in) index of the frame in the mux object
//   frame - (out) data of the returned frame
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or frame is NULL.
//   WEBP_MUX_NOT_FOUND - if there are less than nth frames in the mux object.
//   WEBP_MUX_BAD_DATA - if nth frame chunk in mux is invalid.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxGetFrame(
    const WebPMux* mux, uint32_t nth, WebPMuxFrameInfo* frame);

// Deletes a frame from the mux object.
// nth=0 has a special meaning - last position.
// Parameters:
//   mux - (in/out) object from which a frame is to be deleted
//   nth - (in) The position from which the frame is to be deleted
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL.
//   WEBP_MUX_NOT_FOUND - If there are less than nth frames in the mux object
//                        before deletion.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth);

//------------------------------------------------------------------------------
// Animation.

// Animation parameters.
struct WebPMuxAnimParams {
  uint32_t bgcolor;  // Background color of the canvas stored (in MSB order) as:
                     // Bits 00 to 07: Alpha.
                     // Bits 08 to 15: Red.
                     // Bits 16 to 23: Green.
                     // Bits 24 to 31: Blue.
  int loop_count;    // Number of times to repeat the animation [0 = infinite].
};

// Sets the animation parameters in the mux object. Any existing ANIM chunks
// will be removed.
// Parameters:
//   mux - (in/out) object in which ANIM chunk is to be set/added
//   params - (in) animation parameters.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or params is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxSetAnimationParams(
    WebPMux* mux, const WebPMuxAnimParams* params);

// Gets the animation parameters from the mux object.
// Parameters:
//   mux - (in) object from which the animation parameters to be fetched
//   params - (out) animation parameters extracted from the ANIM chunk
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or params is NULL.
//   WEBP_MUX_NOT_FOUND - if ANIM chunk is not present in mux object.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxGetAnimationParams(
    const WebPMux* mux, WebPMuxAnimParams* params);

//------------------------------------------------------------------------------
// Misc Utilities.

// Sets the canvas size for the mux object. The width and height can be
// specified explicitly or left as zero (0, 0).
// * When width and height are specified explicitly, then this frame bound is
//   enforced during subsequent calls to WebPMuxAssemble() and an error is
//   reported if any animated frame does not completely fit within the canvas.
// * When unspecified (0, 0), the constructed canvas will get the frame bounds
//   from the bounding-box over all frames after calling WebPMuxAssemble().
// Parameters:
//   mux - (in) object to which the canvas size is to be set
//   width - (in) canvas width
//   height - (in) canvas height
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL; or
//                               width or height are invalid or out of bounds
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxSetCanvasSize(WebPMux* mux,
                                              int width, int height);

// Gets the canvas size from the mux object.
// Note: This method assumes that the VP8X chunk, if present, is up-to-date.
// That is, the mux object hasn't been modified since the last call to
// WebPMuxAssemble() or WebPMuxCreate().
// Parameters:
//   mux - (in) object from which the canvas size is to be fetched
//   width - (out) canvas width
//   height - (out) canvas height
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux, width or height is NULL.
//   WEBP_MUX_BAD_DATA - if VP8X/VP8/VP8L chunk or canvas size is invalid.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxGetCanvasSize(const WebPMux* mux,
                                              int* width, int* height);

// Gets the feature flags from the mux object.
// Note: This method assumes that the VP8X chunk, if present, is up-to-date.
// That is, the mux object hasn't been modified since the last call to
// WebPMuxAssemble() or WebPMuxCreate().
// Parameters:
//   mux - (in) object from which the features are to be fetched
//   flags - (out) the flags specifying which features are present in the
//           mux object. This will be an OR of various flag values.
//           Enum 'WebPFeatureFlags' can be used to test individual flag values.
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux or flags is NULL.
//   WEBP_MUX_BAD_DATA - if VP8X/VP8/VP8L chunk or canvas size is invalid.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxGetFeatures(const WebPMux* mux,
                                            uint32_t* flags);

// Gets number of chunks with the given 'id' in the mux object.
// Parameters:
//   mux - (in) object from which the info is to be fetched
//   id - (in) chunk id specifying the type of chunk
//   num_elements - (out) number of chunks with the given chunk id
// Returns:
//   WEBP_MUX_INVALID_ARGUMENT - if mux, or num_elements is NULL.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxNumChunks(const WebPMux* mux,
                                          WebPChunkId id, int* num_elements);

// Assembles all chunks in WebP RIFF format and returns in 'assembled_data'.
// This function also validates the mux object.
// Note: The content of 'assembled_data' will be ignored and overwritten.
// Also, the content of 'assembled_data' is allocated using malloc(), and NOT
// owned by the 'mux' object. It MUST be deallocated by the caller by calling
// WebPDataClear(). It's always safe to call WebPDataClear() upon return,
// even in case of error.
// Parameters:
//   mux - (in/out) object whose chunks are to be assembled
//   assembled_data - (out) assembled WebP data
// Returns:
//   WEBP_MUX_BAD_DATA - if mux object is invalid.
//   WEBP_MUX_INVALID_ARGUMENT - if mux or assembled_data is NULL.
//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
//   WEBP_MUX_OK - on success.
WEBP_EXTERN WebPMuxError WebPMuxAssemble(WebPMux* mux,
                                         WebPData* assembled_data);

//------------------------------------------------------------------------------
// WebPAnimEncoder API
//
// This API allows encoding (possibly) animated WebP images.
//
// Code Example:
/*
  WebPAnimEncoderOptions enc_options;
  WebPAnimEncoderOptionsInit(&enc_options);
  // Tune 'enc_options' as needed.
  WebPAnimEncoder* enc = WebPAnimEncoderNew(width, height, &enc_options);
  while(<there are more frames>) {
    WebPConfig config;
    WebPConfigInit(&config);
    // Tune 'config' as needed.
    WebPAnimEncoderAdd(enc, frame, timestamp_ms, &config);
  }
  WebPAnimEncoderAdd(enc, NULL, timestamp_ms, NULL);
  WebPAnimEncoderAssemble(enc, webp_data);
  WebPAnimEncoderDelete(enc);
  // Write the 'webp_data' to a file, or re-mux it further.
*/

typedef struct WebPAnimEncoder WebPAnimEncoder;  // Main opaque object.

// Forward declarations. Defined in encode.h.
struct WebPPicture;
struct WebPConfig;

// Global options.
struct WebPAnimEncoderOptions {
  WebPMuxAnimParams anim_params;  // Animation parameters.
  int minimize_size;    // If true, minimize the output size (slow). Implicitly
                        // disables key-frame insertion.
  int kmin;
  int kmax;             // Minimum and maximum distance between consecutive key
                        // frames in the output. The library may insert some key
                        // frames as needed to satisfy this criteria.
                        // Note that these conditions should hold: kmax > kmin
                        // and kmin >= kmax / 2 + 1. Also, if kmax <= 0, then
                        // key-frame insertion is disabled; and if kmax == 1,
                        // then all frames will be key-frames (kmin value does
                        // not matter for these special cases).
  int allow_mixed;      // If true, use mixed compression mode; may choose
                        // either lossy and lossless for each frame.
  int verbose;          // If true, print info and warning messages to stderr.

uint32_t padding[4];  // Padding for later use.
};

// Internal, version-checked, entry point.
WEBP_EXTERN int WebPAnimEncoderOptionsInitInternal(
    WebPAnimEncoderOptions*, int);

// Should always be called, to initialize a fresh WebPAnimEncoderOptions
// structure before modification. Returns false in case of version mismatch.
// WebPAnimEncoderOptionsInit() must have succeeded before using the
// 'enc_options' object.
static WEBP_INLINE int WebPAnimEncoderOptionsInit(
    WebPAnimEncoderOptions* enc_options) {
  return WebPAnimEncoderOptionsInitInternal(enc_options, WEBP_MUX_ABI_VERSION);
}

// Internal, version-checked, entry point.
WEBP_EXTERN WebPAnimEncoder* WebPAnimEncoderNewInternal(
    int, int, const WebPAnimEncoderOptions*, int);

// Creates and initializes a WebPAnimEncoder object.
// Parameters:
//   width/height - (in) canvas width and height of the animation.
//   enc_options - (in) encoding options; can be passed NULL to pick
//                      reasonable defaults.
// Returns:
//   A pointer to the newly created WebPAnimEncoder object.
//   Or NULL in case of memory error.
static WEBP_INLINE WebPAnimEncoder* WebPAnimEncoderNew(
    int width, int height, const WebPAnimEncoderOptions* enc_options) {
  return WebPAnimEncoderNewInternal(width, height, enc_options,
                                    WEBP_MUX_ABI_VERSION);
}

// Optimize the given frame for WebP, encode it and add it to the
// WebPAnimEncoder object.
// The last call to 'WebPAnimEncoderAdd' should be with frame = NULL, which
// indicates that no more frames are to be added. This call is also used to
// determine the duration of the last frame.
// Parameters:
//   enc - (in/out) object to which the frame is to be added.
//   frame - (in/out) frame data in ARGB or YUV(A) format. If it is in YUV(A)
//           format, it will be converted to ARGB, which incurs a small loss.
//   timestamp_ms - (in) timestamp of this frame in milliseconds.
//                       Duration of a frame would be calculated as
//                       "timestamp of next frame - timestamp of this frame".
//                       Hence, timestamps should be in non-decreasing order.
//   config - (in) encoding options; can be passed NULL to pick
//            reasonable defaults.
// Returns:
//   On error, returns false and frame->error_code is set appropriately.
//   Otherwise, returns true.
WEBP_EXTERN int WebPAnimEncoderAdd(
    WebPAnimEncoder* enc, struct WebPPicture* frame, int timestamp_ms,
    const struct WebPConfig* config);

// Assemble all frames added so far into a WebP bitstream.
// This call should be preceded by  a call to 'WebPAnimEncoderAdd' with
// frame = NULL; if not, the duration of the last frame will be internally
// estimated.
// Parameters:
//   enc - (in/out) object from which the frames are to be assembled.
//   webp_data - (out) generated WebP bitstream.
// Returns:
//   True on success.
WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
                                        WebPData* webp_data);

// Get error string corresponding to the most recent call using 'enc'. The
// returned string is owned by 'enc' and is valid only until the next call to
// WebPAnimEncoderAdd() or WebPAnimEncoderAssemble() or WebPAnimEncoderDelete().
// Parameters:
//   enc - (in/out) object from which the error string is to be fetched.
// Returns:
//   NULL if 'enc' is NULL. Otherwise, returns the error string if the last call
//   to 'enc' had an error, or an empty string if the last call was a success.
WEBP_EXTERN const char* WebPAnimEncoderGetError(WebPAnimEncoder* enc);

// Deletes the WebPAnimEncoder object.
// Parameters:
//   enc - (in/out) object to be deleted
WEBP_EXTERN void WebPAnimEncoderDelete(WebPAnimEncoder* enc);

//------------------------------------------------------------------------------

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_MUX_H_ */
PK���\�M��NNmux_types.hnu�[���// 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.
// -----------------------------------------------------------------------------
//
// Data-types common to the mux and demux libraries.
//
// Author: Urvang (urvang@google.com)

#ifndef WEBP_WEBP_MUX_TYPES_H_
#define WEBP_WEBP_MUX_TYPES_H_

#include <stdlib.h>  // free()
#include <string.h>  // memset()
#include "./types.h"

#ifdef __cplusplus
extern "C" {
#endif

// Note: forward declaring enumerations is not allowed in (strict) C and C++,
// the types are left here for reference.
// typedef enum WebPFeatureFlags WebPFeatureFlags;
// typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
// typedef enum WebPMuxAnimBlend WebPMuxAnimBlend;
typedef struct WebPData WebPData;

// VP8X Feature Flags.
typedef enum WebPFeatureFlags {
  ANIMATION_FLAG  = 0x00000002,
  XMP_FLAG        = 0x00000004,
  EXIF_FLAG       = 0x00000008,
  ALPHA_FLAG      = 0x00000010,
  ICCP_FLAG       = 0x00000020,

ALL_VALID_FLAGS = 0x0000003e
} WebPFeatureFlags;

// Dispose method (animation only). Indicates how the area used by the current
// frame is to be treated before rendering the next frame on the canvas.
typedef enum WebPMuxAnimDispose {
  WEBP_MUX_DISPOSE_NONE,       // Do not dispose.
  WEBP_MUX_DISPOSE_BACKGROUND  // Dispose to background color.
} WebPMuxAnimDispose;

// Blend operation (animation only). Indicates how transparent pixels of the
// current frame are blended with those of the previous canvas.
typedef enum WebPMuxAnimBlend {
  WEBP_MUX_BLEND,              // Blend.
  WEBP_MUX_NO_BLEND            // Do not blend.
} WebPMuxAnimBlend;

// Data type used to describe 'raw' data, e.g., chunk data
// (ICC profile, metadata) and WebP compressed image data.
struct WebPData {
  const uint8_t* bytes;
  size_t size;
};

// Initializes the contents of the 'webp_data' object with default values.
static WEBP_INLINE void WebPDataInit(WebPData* webp_data) {
  if (webp_data != NULL) {
    memset(webp_data, 0, sizeof(*webp_data));
  }
}

// Clears the contents of the 'webp_data' object by calling free(). Does not
// deallocate the object itself.
static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
  if (webp_data != NULL) {
    free((void*)webp_data->bytes);
    WebPDataInit(webp_data);
  }
}

// Allocates necessary storage for 'dst' and copies the contents of 'src'.
// Returns true on success.
static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
  if (src == NULL || dst == NULL) return 0;
  WebPDataInit(dst);
  if (src->bytes != NULL && src->size != 0) {
    dst->bytes = (uint8_t*)malloc(src->size);
    if (dst->bytes == NULL) return 0;
    memcpy((void*)dst->bytes, src->bytes, src->size);
    dst->size = src->size;
  }
  return 1;
}

#ifdef __cplusplus
}    // extern "C"
#endif

#endif  /* WEBP_WEBP_MUX_TYPES_H_ */
PK���\������types.hnu�[���// Copyright 2010 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.
// -----------------------------------------------------------------------------
//
//  Common types
//
// Author: Skal (pascal.massimino@gmail.com)

#ifndef WEBP_WEBP_TYPES_H_
#define WEBP_WEBP_TYPES_H_

#include <stddef.h>  // for size_t

#ifndef _MSC_VER
#include <inttypes.h>
#if defined(__cplusplus) || !defined(__STRICT_ANSI__) || \
    (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
#define WEBP_INLINE inline
#else
#define WEBP_INLINE
#endif
#else
typedef signed   char int8_t;
typedef unsigned char uint8_t;
typedef signed   short int16_t;
typedef unsigned short uint16_t;
typedef signed   int int32_t;
typedef unsigned int uint32_t;
typedef unsigned long long int uint64_t;
typedef long long int int64_t;
#define WEBP_INLINE __forceinline
#endif  /* _MSC_VER */

#ifndef WEBP_EXTERN
// This explicitly marks library functions and allows for changing the
// signature for e.g., Windows DLL builds.
# if defined(__GNUC__) && __GNUC__ >= 4
#  define WEBP_EXTERN extern __attribute__ ((visibility ("default")))
# else
#  define WEBP_EXTERN extern
# endif  /* __GNUC__ >= 4 */
#endif  /* WEBP_EXTERN */

// Macro to check ABI compatibility (same major revision number)
#define WEBP_ABI_IS_INCOMPATIBLE(a, b) (((a) >> 8) != ((b) >> 8))

#endif  /* WEBP_WEBP_TYPES_H_ */
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