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// Copyright 2011 Google Inc.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// Internal header: WebP decoding parameters and custom IO on buffer
//
// Author: somnath@google.com (Somnath Banerjee)
#ifndef WEBP_DEC_WEBPI_H
#define WEBP_DEC_WEBPI_H
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#include "webp/decode_vp8.h"
// Decoding output parameters.
typedef struct {
uint8_t* output; // rgb(a) or luma
uint8_t *u, *v; // chroma u/v
uint8_t *top_y, *top_u, *top_v; // cache for the fancy upscaler
int stride; // rgb(a) stride or luma stride
int u_stride; // chroma-u stride
int v_stride; // chroma-v stride
WEBP_CSP_MODE mode; // rgb(a) or yuv
int last_y; // coordinate of the line that was last output
int output_size; // size of 'output' buffer
int output_u_size; // size of 'u' buffer
int output_v_size; // size of 'v' buffer
int external_buffer; // If true, the output buffers are externally owned
} WebPDecParams;
// If a RIFF container is detected, validate it and skip over it. Returns
// VP8 bit-stream size if RIFF header is valid else returns 0
uint32_t WebPCheckRIFFHeader(const uint8_t** data_ptr,
uint32_t *data_size_ptr);
// Initializes VP8Io with custom setup, io and teardown functions
void WebPInitCustomIo(VP8Io* const io);
// Initializes params_out by allocating output buffer and setting the
// stride information. It also outputs width and height information of
// the WebP image. Returns 1 if succeeds.
int WebPInitDecParams(const uint8_t* data, uint32_t data_size, int* width,
int* height, WebPDecParams* const params_out);
// Verifies various size configurations (e.g stride >= width, specified
// output size <= stride * height etc.). Returns 0 if checks fail.
int WebPCheckDecParams(const VP8Io* io, const WebPDecParams* params);
// Deallocate memory allocated by WebPInitDecParams() and reset the
// WebPDecParams object.
void WebPClearDecParams(WebPDecParams* params);
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
#endif // WEBP_DEC_WEBPI_H
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