mirror of
https://gitlab.uni-freiburg.de/opensourcevdi/spice
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89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
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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 _H_GLZ_DECODER
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#define _H_GLZ_DECODER
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#include "lz_common.h"
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#include "glz_decoder_config.h"
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#include "glz_decoder_window.h"
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#include "canvas_base.h"
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#include <spice/draw.h>
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class GlzDecodeHandler {
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public:
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GlzDecodeHandler() {}
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virtual ~GlzDecodeHandler() {}
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/* Called by the decoder before the image decoding is starts. The
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user of the decoder should create GlzDecodedImage instance.
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If resources should be released when the image exits the Glz window,
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it should be handled in the instance dtor.
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opaque_usr_info: the data sent when GlzDecoder::decode was called
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gross_pixels : number of pixels when considering the whole stride*/
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virtual GlzDecodedImage *alloc_image(void *opaque_usr_info, uint64_t image_id,
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uint64_t image_win_head_id, LzImageType type,
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int width, int height, int gross_pixels,
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int n_bytes_per_pixel, bool top_down) = 0;
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};
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/*
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This class implements the lz decoding algorithm
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*/
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class GlzDecoder : public SpiceGlzDecoder
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{
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public:
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GlzDecoder(GlzDecoderWindow &images_window, GlzDecodeHandler &usr_handler,
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GlzDecoderDebug &debug_calls);
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virtual ~GlzDecoder();
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/* Decodes the data and afterwards calls GlzDecodeHandler::handle_decoded_image */
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void decode(uint8_t *data, SpicePalette *palette, void *opaque_usr_info);
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private:
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void decode_header();
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uint32_t decode_32();
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uint64_t decode_64();
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private:
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GlzDecoderWindow &_images_window;
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GlzDecodeHandler &_usr_handler;
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GlzDecoderDebug &_debug_calls;
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uint8_t *_in_now;
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uint8_t *_in_start;
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struct {
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uint64_t id;
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LzImageType type;
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int width;
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int height;
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int gross_pixels;
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bool top_down;
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int win_head_dist;
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uint8_t *data;
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} _image;
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};
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#endif // _H_GLZ_DECODER
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