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https://gitlab.uni-freiburg.de/opensourcevdi/spice
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e0b395fb68
Allows to be used by both C and C++ code. So to leave part of the code in C and part move to C++. Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
78 lines
3.3 KiB
C
78 lines
3.3 KiB
C
/*
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Copyright (C) 2009 Red Hat, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GLZ_ENCODER_H_
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#define GLZ_ENCODER_H_
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/* Manging the lz encoding using a dictionary that is shared among encoders */
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#include <common/lz_common.h>
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#include "red-common.h"
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#include "glz-encoder-dict.h"
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SPICE_BEGIN_DECLS
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struct GlzEncoderUsrContext {
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SPICE_GNUC_PRINTF(2, 3) void (*error)(GlzEncoderUsrContext *usr, const char *fmt, ...);
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SPICE_GNUC_PRINTF(2, 3) void (*warn)(GlzEncoderUsrContext *usr, const char *fmt, ...);
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SPICE_GNUC_PRINTF(2, 3) void (*info)(GlzEncoderUsrContext *usr, const char *fmt, ...);
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void *(*malloc)(GlzEncoderUsrContext *usr, int size);
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void (*free)(GlzEncoderUsrContext *usr, void *ptr);
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// get the next chunk of the image which is entered to the dictionary. If the image is down to
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// top, return it from the last line to the first one (stride should always be positive)
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int (*more_lines)(GlzEncoderUsrContext *usr, uint8_t **lines);
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// get the next chunk of the compressed buffer.return number of bytes in the chunk.
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int (*more_space)(GlzEncoderUsrContext *usr, uint8_t **io_ptr);
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// called when an image is removed from the dictionary, due to the window size limit
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void (*free_image)(GlzEncoderUsrContext *usr, GlzUsrImageContext *image);
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};
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typedef void GlzEncoderContext;
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GlzEncoderContext *glz_encoder_create(uint8_t id, GlzEncDictContext *dictionary,
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GlzEncoderUsrContext *usr);
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void glz_encoder_destroy(GlzEncoderContext *opaque_encoder);
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/*
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assumes width is in pixels and stride is in bytes
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usr_context : when an image is released from the window due to capacity overflow,
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usr_context is given as a parameter to the free_image callback.
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o_enc_dict_context: if glz_enc_dictionary_remove_image is called, it should be
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called with the o_enc_dict_context that is associated with
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the image.
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return: the number of bytes in the compressed data and sets o_enc_dict_context
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NOTE : currently supports only rgb images in which width*bytes_per_pixel = stride OR
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palette images in which stride equals the min number of bytes to hold a line.
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The stride should be > 0
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*/
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int glz_encode(GlzEncoderContext *opaque_encoder, LzImageType type, int width, int height,
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int top_down, uint8_t *lines, unsigned int num_lines, int stride,
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uint8_t *io_ptr, unsigned int num_io_bytes, GlzUsrImageContext *usr_context,
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GlzEncDictImageContext **o_enc_dict_context);
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SPICE_END_DECLS
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#endif /* GLZ_ENCODER_H_ */
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