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/*
Copyright (C) 2009 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _H_GLZ_ENCODER
#define _H_GLZ_ENCODER
/* Manging the lz encoding using a dictionary that is shared among encoders */
#include "common.h"
#include "common/lz_common.h"
#include "glz-encoder-dict.h"
struct GlzEncoderUsrContext {
SPICE_GNUC_PRINTF(2, 3) void (*error)(GlzEncoderUsrContext *usr, const char *fmt, ...);
SPICE_GNUC_PRINTF(2, 3) void (*warn)(GlzEncoderUsrContext *usr, const char *fmt, ...);
SPICE_GNUC_PRINTF(2, 3) void (*info)(GlzEncoderUsrContext *usr, const char *fmt, ...);
void *(*malloc)(GlzEncoderUsrContext *usr, int size);
void (*free)(GlzEncoderUsrContext *usr, void *ptr);
// get the next chunk of the image which is entered to the dictionary. If the image is down to
// top, return it from the last line to the first one (stride should always be positive)
int (*more_lines)(GlzEncoderUsrContext *usr, uint8_t **lines);
// get the next chunk of the compressed buffer.return number of bytes in the chunk.
int (*more_space)(GlzEncoderUsrContext *usr, uint8_t **io_ptr);
// called when an image is removed from the dictionary, due to the window size limit
void (*free_image)(GlzEncoderUsrContext *usr, GlzUsrImageContext *image);
};
typedef void GlzEncoderContext;
GlzEncoderContext *glz_encoder_create(uint8_t id, GlzEncDictContext *dictionary,
GlzEncoderUsrContext *usr);
void glz_encoder_destroy(GlzEncoderContext *opaque_encoder);
/*
assumes width is in pixels and stride is in bytes
usr_context : when an image is released from the window due to capacity overflow,
usr_context is given as a parameter to the free_image callback.
o_enc_dict_context: if glz_enc_dictionary_remove_image is called, it should be
called with the o_enc_dict_context that is associated with
the image.
return: the number of bytes in the compressed data and sets o_enc_dict_context
NOTE : currently supports only rgb images in which width*bytes_per_pixel = stride OR
palette images in which stride equals the min number of bytes to hold a line.
The stride should be > 0
*/
int glz_encode(GlzEncoderContext *opaque_encoder, LzImageType type, int width, int height,
int top_down, uint8_t *lines, unsigned int num_lines, int stride,
uint8_t *io_ptr, unsigned int num_io_bytes, GlzUsrImageContext *usr_context,
GlzEncDictImageContext **o_enc_dict_context);
#endif // _H_GLZ_ENCODER
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