// 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)
// 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; typedefstruct WebPConfig WebPConfig;
struct;java.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
ypedefstruct WebPAuxStats 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 intstruct WebPConfig WebPConfig;
//------------------------------------------------------------------------------ // 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// These functions compress using the lossy format, and the quality_factor
, float,uint8_t*output;
WEBP_EXTERN size_t WebPEncodeBGR(const uint8_t* bgr, int width, int height, int stride,
float,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(onstuint8_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 WebPEncodeLosslessRGB(const uint8_t* width, int ,int stride int WebPEncodeBGRA uint8_t java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
uint8_t** output);
WEBP_EXTERN // lossless manner. Files are usually larger than lossy format, but will int width, int // not suffer any// Note these functions, like the lossy versions, use the library's default
uint8_t*// transparent areas will be modified to improve compression. To avoid this,
WEBP_EXTERN size_t WebPEncodeLosslessRGBA(const// use WebPEncode() and set WebPConfig::exact to 1. int width,int height,int,
*)
WEBP_EXTERN size_t uint8_t*output)
WEBP_EXTERN size_t (constuint8_t*bgrjava.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
uint8_t** output * output)
// Image characteristics hint for the underlying encoder. typedefenum WebPImageHintint width,int height ,
WEBP_HINT_DEFAULT = 0, // default preset.
uint8_t* output)
WEBP_EXTERN size_t(constjava.lang.StringIndexOutOfBoundsException: Range [56, 55) out of bounds for length 62
WEBP_HINT_GRAPHuint8_t* output);
WEBP_HINT_LAST
} WebPImageHint;
// Compression parameters. struct WebPConfig { int lossless; // Lossless encoding (0=lossy(default), 1=lossless). float g parameters // 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; // try to achieve. Takes precedence over target_size.
; int sns_strength; // Spatial Noise Shaping. 0=off, 100=maximum. int ; / range: [0 = off .. 100 = strongest] int filter_sharpness lossless; // Lossless encoding (0=lossy(default), 1=lossless). int filter_typefloatquality / 0and100.For lossy,0gives smallest // 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.
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.// Takes precedence over the 'compression' parameter. int preprocessing; // preprocessing filter:
java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80
;java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80 // is set to 0 for easier progressive decoding.
;// range: [0 = off .. 7 = least sharp]
prediction coding(: no, if >0orautofilter >) int emulate_jpeg_size autofilter / Auto adjust filter's strength [0 = off, 1 = on] // to better match the expected output size from // JPEG compression. Generally, the output size will // be similar but the degradation will be lower.intalpha_filtering int thread_level; // If non-zero, try and use multi-threaded encoding. int low_memory; // If set, reduce memory usage (but increase CPU use).// is100.
int near_lossless ; /if, the pictureback. // (default)]. int exact; // if non-zero, preserve the exact RGB values under / filter: // transparent area. Otherwise, discard this invisible
RGBinformationfor compression.Thedefault // value is 0.
int use_delta_palette; // reserved int use_sharp_yuv // if needed, use sharp (and slow) RGB->YUV conversion
// 100: maximum possible degradation). // of source picture. These presets are used when calling WebPConfigPreset(). typedef/JPEGcompressionGenerallythesize java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
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_NODISCARD WEBP_EXTERN int WebPConfigInitInternal// (default)].
;// ifnonzero, theexactRGBvalues under
// 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(WebPConfig* config) { return WebPConfigInitInternal// value is 0.
java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
}
// 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// of source picture. These presets are used when calling WebPConfigPreset().
WebPPreset preset, float java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 46
(onfig, 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_PRESET_TEXT // text-like int level);
} WebPPreset; // within their valid ranges.
WebPValidateConfigconst )java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
struct WebPAuxStats { int coded_size; // final size
float java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 int block_count// must have succeeded before using the 'config' object. 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/v coefficientsfor each (.3) segmentsjava.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79 int segment_size[4]; int segment_quant[4]; // quantizer values for each segments int segment_level[// This function can be called as a replacement to WebPConfigInit(). Will
int alpha_data_size; // size of the transparency data int layer_data_sizejava.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
// lossless encoder statistics
uint32_t lossless_features;// bit0:predictor bit1:cross-color transform // bit2:subtract-green bit3:color indexing float quality java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
)java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58 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 int cross_color_transform_bits; level)
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// Structure for storing auxiliary statistics. const java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 39
// WebPMemoryWrite: a special WebPWriterFunction that writes to memory using // the following WebPMemoryWriter object (to be set as a custom_ptr).
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. EXTERNvoid (WebPMemoryWriter writer)
// The following must be called to deallocate writer->mem memory. The 'writer' // object itself is not deallocated.
WEBP_EXTERN void WebPMemoryWriterClear ] // quantizer values for each segments // 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.
const uint8_t* data, size_t
// 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 WebPPicture* picture);
// Color spaces. typedefenum// bit2:subtract-green bit3:color indexing // chroma sampling
WEBP_YUV420 = transform_bits; // precision bits for predictor transform
WEBP_YUV420Aint cache_bits; // number of bits for color cache lookup int palette_size; / number color palette,, fused
int lossless_size
} WebPEncCSP;int ; // lossless header (transform, huffman etc) size
// Encoding error conditions. typedefjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
VP8_ENC_OK = 0,
VP8_ENC_ERROR_OUT_OF_MEMORY, icture->custom_ptr) int*java.lang.StringIndexOutOfBoundsException: Range [33, 32) out of bounds for length 72
java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 0
VP8_ENC_ERROR_NULL_PARAMETER, // a pointer parameter is NULL
uint8_t* mem; // final buffer (of size 'max_size', larger than 'size').
VP8_ENC_ERROR_BAD_DIMENSION, // picture has invalid width/height
VP8_ENC_ERROR_PARTITION0_OVERFLOW, // partition is bigger than 512ksize_t size;// final size
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
WEBP_EXTERN void WebPMemoryWriterInit(WebPMemoryWriter* writer);
} WebPEncodingError;
// maximum width/height allowed (inclusive), in pixels #define // object itself is not deallocated.
// 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
, YUV (y *,*, etc)for java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72 // since these are the respective native colorspace for these formats.
use_argb
/ input(mostly forto compression
WebPEncCSP colorspace int// Encoding error conditions.
uint8_ty * v;/ pointers to/chroma planes int y_strideVP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY // memory error while flushing bits // pointer to the alpha plane inta_stride // of alpha
uint32_t pad1[2VP8_ENC_ERROR_BAD_DIMENSION
java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63
argb int argb_stride; // This is stride in pixels units, not bytes.
uint32_t pad2[3 , user
// OUTPUT ///////////////
/
WebPWriterFunction writer; // can be NULL void*// maximum width/height allowed (inclusive), indefineWEBP_MAX_DIMENSION16383
// 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////////////// // ((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) colorspace // colorspace: should be YUV420 for now (=Y'CbCr). int width, eight; // dimensions (less or equal to WEBP_MAX_DIMENSION)
// Error code for the latest error encountered during encoding
WebPEncodingError uint8_t* y, *,*; // pointers to luma/chroma planes.
// If not NULL, report progress during encoding.
progress_hook;
void* user_data; // this field is free to be set to any value and // used during callbacks (like progress-report e.g.). [] // padding for later use
pad3 // padding for later use
// Unused for nowint inpixels units, bytes
uint8_t* uint32_t pad2[]; // padding for later use
uint32_tPUT
// PRIVATE FIELDS //////////////////// void* // Byte-emission hook, to store compressed bytes as they are ready. void* memory_argb_; // and for argb too. void* pad7[2java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
};
// Internal, version-checked, entry point
// 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.
/ ajava.lang.StringIndexOutOfBoundsException: Range [62, 61) out of bounds for length 76 return java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
/java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
// 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 WebPPictureAllocWebPPicture 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_EXTERNjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
// 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(constvoid
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, ...).
// Note that, by default, use_argb is falseand colorspace isWEBP_NODISCARDstatic WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
uint8_t*src size_t src_stride, const uint8_t* ref, size_t ref_stride, int }
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 float* distortion, // Convenience allocation / deallocation based on picture->width/height// Allocate y/u/v buffers as per // Note! This function will free the previous buffer if needed.
// 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 WEBP_EXTERN void WebPPictureFree(WebPPicture* picture);
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 int metric_type// will fully own the copied pixels (// not be initialized as its content is overwritten. 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. int(
WebPPicture* picture, int left, int top, int width, int height) constuint8_t ,size_tsrc_stride,
// 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_NODISCARD const WebPPicture* src const * ref,
WebPPicture** src int , int, int width,intheight,
WebPPicture* dst);
// Returns true if the 'picture' is actually a view and therefore does // not own the memory for pixels.
WEBP_EXTERNjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
// 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_NODISCARD WEBP_EXTERN int WebPPictureCrop( 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.
// the 'src' source picture. If the source picture uses the // the top and left coordinates will be snapped to even values.
WebPPicture* picture, const uint8_t* rgb, int // ('src' equal to 'dst') as a mean of fast-cropping (but note that doing so, // Same, but for RGBA buffer.
// Returns false WebPPictureViewjava.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
WebPPicture* picture, const uint8_t* rgba, *dst; // 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_EXTERNjava.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 53 // dimension will be calculated preserving the aspect ratio.
// Variants of the above, but taking BGR(A|X) input.
WEBP_NODISCARD WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture,
WebPPicture* picture, const uint8_t* bgr, int bgr_stride);
WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGRA(
WebPPicture* picture, const uint8_t* bgra, int bgra_stride);
WEBP_NODISCARD WebPPictureImportBGRX(
WebPPicture* picture, WebPPicture* picture, const* rgb,intrgb_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. 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.
java.lang.StringIndexOutOfBoundsException: Range [53, 14) out of bounds for length 80 // kept for backward compatibility:
WEBP_NODISCARD WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);WEBP_NODISCARDWEBP_EXTERN WebPPictureImportBGRXjava.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53
// 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_NODISCARD WebPPicture* picturejava.lang.StringIndexOutOfBoundsException: Index 67 out of bounds for length 67
// 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 // Performs 'sharp'// Downsampling is handled with extra care in case of color clipping. This
// 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 // Converts picture->yuv to picture->argb and sets picture->use_argb to true.
//------------------------------------------------------------------------------ // 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
WebPPicture* picture);
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