diff options
Diffstat (limited to 'media/libwebp/src/webp')
| -rw-r--r-- | media/libwebp/src/webp/decode.h | 503 | ||||
| -rw-r--r-- | media/libwebp/src/webp/demux.h | 363 | ||||
| -rw-r--r-- | media/libwebp/src/webp/encode.h | 552 | ||||
| -rw-r--r-- | media/libwebp/src/webp/format_constants.h | 87 | ||||
| -rw-r--r-- | media/libwebp/src/webp/mux.h | 530 | ||||
| -rw-r--r-- | media/libwebp/src/webp/mux_types.h | 98 | ||||
| -rw-r--r-- | media/libwebp/src/webp/types.h | 72 |
7 files changed, 2205 insertions, 0 deletions
diff --git a/media/libwebp/src/webp/decode.h b/media/libwebp/src/webp/decode.h new file mode 100644 index 0000000000..d98247509a --- /dev/null +++ b/media/libwebp/src/webp/decode.h @@ -0,0 +1,503 @@ +// 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 0x0209 // 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. +// Note: The following chunk sequences (before the raw VP8/VP8L data) are +// considered valid by this function: +// RIFF + VP8(L) +// RIFF + VP8X + (optional chunks) + VP8(L) +// ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose. +// VP8(L) <-- Not a valid WebP format: only allowed for internal purpose. +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: https://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); + +// 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. +// Note: The following chunk sequences (before the raw VP8/VP8L data) are +// considered valid by this function: +// RIFF + VP8(L) +// RIFF + VP8X + (optional chunks) + VP8(L) +// ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose. +// VP8(L) <-- Not a valid WebP format: only allowed for internal purpose. +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; // if true, 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_ diff --git a/media/libwebp/src/webp/demux.h b/media/libwebp/src/webp/demux.h new file mode 100644 index 0000000000..846eeb15a9 --- /dev/null +++ b/media/libwebp/src/webp/demux.h @@ -0,0 +1,363 @@ +// 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, ×tamp); + // ... (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_ diff --git a/media/libwebp/src/webp/encode.h b/media/libwebp/src/webp/encode.h new file mode 100644 index 0000000000..56b68e2f10 --- /dev/null +++ b/media/libwebp/src/webp/encode.h @@ -0,0 +1,552 @@ +// 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 0x020f // 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. +// 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* 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); + +//------------------------------------------------------------------------------ +// 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 + + 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(). +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) +// +// 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; // 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 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* picture, 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* 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_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture); + +//------------------------------------------------------------------------------ + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // WEBP_WEBP_ENCODE_H_ diff --git a/media/libwebp/src/webp/format_constants.h b/media/libwebp/src/webp/format_constants.h new file mode 100644 index 0000000000..999035c5d2 --- /dev/null +++ b/media/libwebp/src/webp/format_constants.h @@ -0,0 +1,87 @@ +// 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. +// ----------------------------------------------------------------------------- +// +// Internal header for constants related to WebP file format. +// +// Author: Urvang (urvang@google.com) + +#ifndef WEBP_WEBP_FORMAT_CONSTANTS_H_ +#define WEBP_WEBP_FORMAT_CONSTANTS_H_ + +// Create fourcc of the chunk from the chunk tag characters. +#define MKFOURCC(a, b, c, d) ((a) | (b) << 8 | (c) << 16 | (uint32_t)(d) << 24) + +// VP8 related constants. +#define VP8_SIGNATURE 0x9d012a // Signature in VP8 data. +#define VP8_MAX_PARTITION0_SIZE (1 << 19) // max size of mode partition +#define VP8_MAX_PARTITION_SIZE (1 << 24) // max size for token partition +#define VP8_FRAME_HEADER_SIZE 10 // Size of the frame header within VP8 data. + +// VP8L related constants. +#define VP8L_SIGNATURE_SIZE 1 // VP8L signature size. +#define VP8L_MAGIC_BYTE 0x2f // VP8L signature byte. +#define VP8L_IMAGE_SIZE_BITS 14 // Number of bits used to store + // width and height. +#define VP8L_VERSION_BITS 3 // 3 bits reserved for version. +#define VP8L_VERSION 0 // version 0 +#define VP8L_FRAME_HEADER_SIZE 5 // Size of the VP8L frame header. + +#define MAX_PALETTE_SIZE 256 +#define MAX_CACHE_BITS 11 +#define HUFFMAN_CODES_PER_META_CODE 5 +#define ARGB_BLACK 0xff000000 + +#define DEFAULT_CODE_LENGTH 8 +#define MAX_ALLOWED_CODE_LENGTH 15 + +#define NUM_LITERAL_CODES 256 +#define NUM_LENGTH_CODES 24 +#define NUM_DISTANCE_CODES 40 +#define CODE_LENGTH_CODES 19 + +#define MIN_HUFFMAN_BITS 2 // min number of Huffman bits +#define MAX_HUFFMAN_BITS 9 // max number of Huffman bits + +#define TRANSFORM_PRESENT 1 // The bit to be written when next data + // to be read is a transform. +#define NUM_TRANSFORMS 4 // Maximum number of allowed transform + // in a bitstream. +typedef enum { + PREDICTOR_TRANSFORM = 0, + CROSS_COLOR_TRANSFORM = 1, + SUBTRACT_GREEN_TRANSFORM = 2, + COLOR_INDEXING_TRANSFORM = 3 +} VP8LImageTransformType; + +// Alpha related constants. +#define ALPHA_HEADER_LEN 1 +#define ALPHA_NO_COMPRESSION 0 +#define ALPHA_LOSSLESS_COMPRESSION 1 +#define ALPHA_PREPROCESSED_LEVELS 1 + +// Mux related constants. +#define TAG_SIZE 4 // Size of a chunk tag (e.g. "VP8L"). +#define CHUNK_SIZE_BYTES 4 // Size needed to store chunk's size. +#define CHUNK_HEADER_SIZE 8 // Size of a chunk header. +#define RIFF_HEADER_SIZE 12 // Size of the RIFF header ("RIFFnnnnWEBP"). +#define ANMF_CHUNK_SIZE 16 // Size of an ANMF chunk. +#define ANIM_CHUNK_SIZE 6 // Size of an ANIM chunk. +#define VP8X_CHUNK_SIZE 10 // Size of a VP8X chunk. + +#define MAX_CANVAS_SIZE (1 << 24) // 24-bit max for VP8X width/height. +#define MAX_IMAGE_AREA (1ULL << 32) // 32-bit max for width x height. +#define MAX_LOOP_COUNT (1 << 16) // maximum value for loop-count +#define MAX_DURATION (1 << 24) // maximum duration +#define MAX_POSITION_OFFSET (1 << 24) // maximum frame x/y offset + +// Maximum chunk payload is such that adding the header and padding won't +// overflow a uint32_t. +#define MAX_CHUNK_PAYLOAD (~0U - CHUNK_HEADER_SIZE - 1) + +#endif // WEBP_WEBP_FORMAT_CONSTANTS_H_ diff --git a/media/libwebp/src/webp/mux.h b/media/libwebp/src/webp/mux.h new file mode 100644 index 0000000000..7d27489a40 --- /dev/null +++ b/media/libwebp/src/webp/mux.h @@ -0,0 +1,530 @@ +// 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); + WebPFree(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 WebPMalloc(), 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 WebPMalloc(), 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_ diff --git a/media/libwebp/src/webp/mux_types.h b/media/libwebp/src/webp/mux_types.h new file mode 100644 index 0000000000..2fe8195839 --- /dev/null +++ b/media/libwebp/src/webp/mux_types.h @@ -0,0 +1,98 @@ +// 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 <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. +// 'bytes' memory must be allocated using WebPMalloc() and such. +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 WebPFree(). +// Does not deallocate the object itself. +static WEBP_INLINE void WebPDataClear(WebPData* webp_data) { + if (webp_data != NULL) { + WebPFree((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*)WebPMalloc(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_ diff --git a/media/libwebp/src/webp/types.h b/media/libwebp/src/webp/types.h new file mode 100644 index 0000000000..f255432e41 --- /dev/null +++ b/media/libwebp/src/webp/types.h @@ -0,0 +1,72 @@ +// 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 + memory wrappers +// +// 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 +# if defined(_MSC_VER) && defined(WEBP_DLL) +# define WEBP_EXTERN __declspec(dllexport) +# else +# define WEBP_EXTERN extern +# endif +# 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)) + +#ifdef __cplusplus +extern "C" { +#endif + +// Allocates 'size' bytes of memory. Returns NULL upon error. Memory +// must be deallocated by calling WebPFree(). This function is made available +// by the core 'libwebp' library. +WEBP_EXTERN void* WebPMalloc(size_t size); + +// Releases memory returned by the WebPDecode*() functions (from decode.h). +WEBP_EXTERN void WebPFree(void* ptr); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // WEBP_WEBP_TYPES_H_ |