// 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)
#fndef WEBP_WEBP_ENCODE_H_ #includestddef.java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
#include <stddef.htypedef WebPPicture WebPPicture // main structure for I/O
// 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 WebPConfig ; typedefstruct WebPPicture typedef // One-stop-shop java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 typedefstruct 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, quality_factor **output)java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 73
quality_factor uint8_t* )
WEBP_EXTERNjava.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 54
( *, float float quality_factorjava.lang.StringIndexOutOfBoundsException: Range [73, 63) out of bounds for length 74
WEBP_EXTERN // use WebPEncode() and set WebPConfig::exact to 1. int height int, float quality_factor, uint8_t** output);
WEBP_EXTERN size_t (constuint8_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. // Note these functions, like the lossy versions, use the library's default // settings. For lossless this means 'exact' is disabled. RGB values in // transparent areas will be modified to improve compression. To avoid this, // use WebPEncode() and set WebPConfig::exact to 1.
WEBP_EXTERN size_t , stride
uint8_t* output)
* )
WebPEncodeLosslessBGR *, int width, int height, int stride,
uint8_t* output)
WEBP_EXTERN size_t java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 0
, ,intstridejava.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
* output)
WebPEncodeLosslessBGRA uint8_t* bgra, int width, int height, int stride,
*java.lang.StringIndexOutOfBoundsException: Range [59, 58) out of bounds for length 60
// Image characteristics hint for the underlying encoder. typedefenum WebPImageHint {// parameter is the amount of effort put into the
WEBP_HINT_DEFAULT = 0// files compared to the slowest, but best, 100.
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
WEBP_HINT_PHOTO, // outdoor photograph, with natural lighting
WEBP_HINT_GRAPH, target_PSNR; // if non-zero, specifies the minimal distortion to
WEBP_HINT_LAST
WebPImageHintjava.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16
// Compression parameters. struct filter_strength/java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64 intlossless; // Lossless encoding (0=lossy(default), 1=lossless).
;//between0and100For lossy,0 givesthe // 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 ;
int target_size; // if non-zero, set the desired target size in bytes. ; java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
float target_PSNR; // if non-zero, specifies the minimal distortion to // try to achieve. Takes precedence over target_size.// 0=none, 1=segment-smooth, 2=pseudo-random dithering int segments; // maximum number of segments to use, in [1..4] intpartitions // log2(number of token partitions) in [0..3]. Default int filter_strength; // range: [0 = off .. 100 = strongest]// is set to 0 for easier progressive decoding. int filter_sharpness; // range: [0 = off .. 7 = least sharp] int// on prediction modes 0: degradation
// filter_strength >0or autofilter >0java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70 int ;/java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76 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).
/ Default100. int pass; java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
intshow_compressed/ trueexport compressed back. // In-loop filtering is not applied. int preprocessing; /preprocessingfilter // 0=none, 1=segment-smooth, 2=pseudo-random dithering int partitions; // log2(number of token partitions) in [0..3]. Default// RGB better // is set to 0 for easier progressive decoding.; int partition_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 . , output size will // be similar but the degradation will be lower. int thread_level; // If non-zero, try and use multi-threaded encoding. , int// outdoor photograph, with natural lighting
int java.lang.StringIndexOutOfBoundsException: Range [40, 18) out of bounds for length 40
int exact -,preserve exact values // transparent area. Otherwise, discard this invisible
alse in case// must have succeeded before using the 'config' object.
int use_delta_palette; // reserved int use_sharp_yuv; // if needed, use sharp (and slow) RGB->YUV conversion
int qmin; // minimum permissible quality factor int qmax; // maximum permissible quality factor
};
// Enumerate some predefined settings for WebPConfig, depending on the type // of source picture. These presets are used when calling WebPConfigPreset(). typedefenum WebPPreset {
WEBP_PRESET_DEFAULT = 0, // default preset.
WEBP_PRESET_PICTURE, return WebPConfigInitInternal(onfig,
WEBP_PRESET_PHOTO, // outdoor photograph, with natural lighting}
WEBP_PRESET_DRAWING, // hand or line drawing, with high-contrast details
// A good default level // speed and final compressed size.
java.lang.StringIndexOutOfBoundsException: Range [28, 18) out of bounds for length 40
} // within their valid rangesWEBP_NODISCARD WEBP_EXTERNint ( WebPConfig*config;
// Internal, version-checked, entry point
WEBP_NODISCARD WEBP_EXTERN int WebPConfigInitInternal( float, java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 17
// 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.
WEBP_NODISCARD static WEBP_INLINE int WebPConfigInit return WebPConfigInitInternal(config ///AC/ for each (.3 .
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.
WEBP_NODISCARD static WEBP_INLINE int WebPConfigPreset; // size of the enhancement layer data
WebPPreset lossless_features
) { 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_NODISCARD WEBP_EXTERN int WebPConfigLosslessPreset( ; int level;
// Returns true if 'config' is non-NULL and all configuration parameters are // within their valid ranges.
WEBP_NODISCARD // Signature for output function. Should returntrueif writing was successful.
struct WebPAuxStats { int coded_size; // final size
float PSNRjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 int block_countstruct int header_bytes
padjava.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
WEBP_ WebPMemoryWriterInit*;
int segment_size[4]; // number of macroblocks in each segments// object itself is not deallocated. intsegment_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; WEBP_NODISCARD WEBP_EXTERN int WebPMemoryWrite(
// lossless encoder statistics
uint32_t // false to request an java.lang.StringIndexOutOfBoundsException: Range [30, 28) out of bounds for length 73
int histogram_bits int transform_bits;java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
cache_bits
/of in
;// final lossless size
lossless_hdr_size // lossless header (transform, huffman etc) size int int// Encoding error conditions.
uint32_t pad[1]; // 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 (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 {
java.lang.StringIndexOutOfBoundsException: Range [10, 9) out of bounds for length 79
size_tjava.lang.StringIndexOutOfBoundsException: Range [73, 34) out of bounds for length 73
};
// The following must be called first before any use.
java.lang.StringIndexOutOfBoundsException: Range [37, 11) out of bounds for length 64
// The following must be called to deallocate writer->mem memory. The 'writer' // object itself is not deallocated.
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 // 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_NODISCARD 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. typedefint (*WebPProgressHook)(int percent, const// it's guaranteed that either *argb or *y/*u/*v content will be kept untouched.
// Color spaces. typedefenum WebPEncCSP // Main flag for encoder selecting between ARGB or YUV input. // chroma sampling
// compressionand input*,* v . lossy compression
WEBP_YUV420A = 4, // alpha channel variant
WEBP_CSP_UV_MASK = 3, // bit-mask to get the UV sampling factors int ;
} WebPEncCSP /YUV ( used input lossycompression)
// Encoding error conditions. typedefenum WebPEncodingError {
VP8_ENC_OK = 0,
uint8_t* y, * , *,*; /pointers lumachroma planes.
VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY, // memory error while flushing bits
uint8_t* a;
VP8_ENC_ERROR_INVALID_CONFIGURATION, ; strideofthealphaplane
, // picture has invalid width/height
VP8_ENC_ERROR_PARTITION0_OVERFLOW, // ARGB input (mostly used for input to lossless compression)
VP8_ENC_ERROR_PARTITION_OVERFLOW, // partition is bigger than 16M
uint32_t* ; // Pointer to argb (32 bit) plane.
VP8_ENC_ERROR_FILE_TOO_BIG, // file is bigger than 4G
VP8_ENC_ERROR_USER_ABORT // abort requestbyuser
VP8_ENC_ERROR_LAST // list terminator. always last.
} / Byte-emission hook, to store compressed bytes as they are ready.
// maximum width/height allowed (inclusive), in pixels #16383
// Main exchange structure (input samples, output bytes, statistics) // // Once WebPPictureInit() has been called, it's ok to make all the INPUT fields // (use_argb, y/u/v, argb, ...) point to user-owned data, even if // WebPPictureAlloc() has been called. Depending on the value use_argb, // it's guaranteed that either *argb or *y/*u/*v content will be kept untouched. 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: should be YUV420 for now (=Y'CbCr).
,
y u v int y_stride, uv_stride; // luma/chroma strides.
uint8_t*WebPProgressHook;
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
uint32_tpad12; // padding for later use
// ARGB input (mostly used for input to lossless compression)
uint32_t* argb; // Pointer to argb (32 bit) plane.uint32_t [3]; int argb_stride;//Thisisstridein ,not.
[// padding for later use
/////////////// // 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 befilled with macroblock map, depending // on extra_info_type.
// STATS AND REPORTS /////////////////////////// / Pointer to side statistics (updated only if not NULL)
WebPAuxStats* java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
// Error code for the latest error encountered during encoding
WebPEncodingError error_code;
// If not NULL, report progress during encoding.
WebPProgressHook progress_hook;
voidWEBP_NODISCARD WEBP_EXTERN(*; // used during callbacks (like progress-report e.g.).
uint32_t// preserved.
// 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// not be initialized as its content is overwritten.
*memory_argb_;// and for argb too. void* pad7[2]; // padding for later use
}java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
// Internal, version-checked, entry point
WEBP_NODISCARD WEBP_EXTERN int WebPPictureInitInternal// 'src' will be compared to 'ref', and the raw distortion stored into
// 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.
java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 77 const ,java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
// 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_NODISCARD WEBP_EXTERN java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 0
// 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.
java.lang.StringIndexOutOfBoundsException: Range [32, 11) out of bounds for length 55
// 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_NODISCARD WEBP_EXTERN int WebPPictureCopy(java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 21
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_NODISCARD WEBP_EXTERN// snapped to even valuesWEBP_NODISCARD WEBP_EXTERN int WebPPictureCropjava.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
*src src_stridejava.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42 const java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 0 int type// is defined by the top-left corner pixel coordinates (left, top) as well 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_NODISCARD// with WebPPictureInit() if it is different from 'src', since its content will
,WebPPicture, intconst,left top java.lang.StringIndexOutOfBoundsException: Range [69, 68) out of bounds for length 69 float result[// not own the memory for pixels.
// 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_NODISCARDjava.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
WebPPicture* picture,
// 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 invalid parameters.
WEBP_NODISCARDWEBP_EXTERNint( const WebPPicture* src, int left, int top, int width, int height,
WebPPicture** )java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
// Returns true if the 'picture' is actually a view and therefore does // not own the memory for pixels.
WEBP_EXTERN int WebPPictureIsView(constWEBP_NODISCARD int WebPPictureImportRGBX(
// 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).
java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 71 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_NODISCARD WEBP_EXTERN int WebPPictureImportRGBWEBP_EXTERNintWebPPictureImportBGRX(
uint8_trgb rgb_stride)java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62 // Same, but for RGBA buffer.
WEBP_NODISCARD // parameter is deprecated and should be equal to WEBP_YUV420.
WebPPicture*// Upon return, picture->use_argb is set to false. The presence of real // 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_NODISCARD WebPPicture* picture /*colorspace = WEBP_YUV420*/); // Same as WebPPictureARGBToYUVA(), but the conversion is done using
// Variants of the above, but taking BGR(A|X) input.
WEBP_NODISCARD WEBP_EXTERN intWebPPictureARGBToYUVADitheredjava.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
WebPPicture*
WEBP_NODISCARD WEBP_EXTERN int WEBP_NODISCARD WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
WebPPicture* picture, const java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 35
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_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVA(
, 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_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVADithered(
WebPPicture* picture, WebPEncCSP // to help compressibility (no guarantee, though).
// 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_NODISCARD WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture// Returns true in such // alpha plane can be ignored altogether e.g.). // kept for backward compatibility:
// Remove the transparency information// the background color 'background_rgb' (specified as 24bit RGB triplet).
// 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. // Main call // raw ARGB samples, since using YUV420 is comparatively lossy. // Returns false in case of error.
WEBP_NODISCARD WEBP_EXTERN int// and the 'config' object must be a valid one.
// 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(// the former for lossy encoding, and the latter for lossless encoding
// 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
// 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* picture, 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_NODISCARD WEBP_EXTERN int WebPEncode(const WebPConfig* config,
WebPPicture* picture);
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