+++ /dev/null
-/* === S Y N F I G ========================================================= */
-/*! \file trgt_gif.h
-** \brief Template Header
-**
-** $Id$
-**
-** \legal
-** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
-**
-** This package is free software; you can redistribute it and/or
-** modify it under the terms of the GNU General Public License as
-** published by the Free Software Foundation; either version 2 of
-** the License, or (at your option) any later version.
-**
-** This package 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
-** General Public License for more details.
-** \endlegal
-**
-** === N O T E S ===========================================================
-**
-** ========================================================================= */
-
-/* === S T A R T =========================================================== */
-
-#ifndef __SYNFIG_TRGT_GIF_H
-#define __SYNFIG_TRGT_GIF_H
-
-/* === H E A D E R S ======================================================= */
-
-#include <synfig/target_scanline.h>
-#include <synfig/string.h>
-#include <synfig/smartfile.h>
-#include <cstdio>
-#include <synfig/surface.h>
-#include <synfig/palette.h>
-
-/* === M A C R O S ========================================================= */
-
-/* === T Y P E D E F S ===================================================== */
-
-/* === C L A S S E S & S T R U C T S ======================================= */
-
-class gif : public synfig::Target_Scanline
-{
- SYNFIG_TARGET_MODULE_EXT
-private:
- // Class for abstracting the
- // output of the codes
- struct bitstream
- {
- synfig::SmartFILE file;
- unsigned char pool;
- char curr_bit;
- bitstream():pool(0),curr_bit(0),curr_pos(0) {}
- bitstream(synfig::SmartFILE file):file(file),pool(0),curr_bit(0),curr_pos(0) {}
- unsigned char buffer[256];
- int curr_pos;
-
- // Pushes a single bit onto the bit
- void push_bit(bool bit)
- {
- if(bit)
- pool|=(1<<(curr_bit));
- curr_bit++;
- if(curr_bit==8)
- empty();
- }
-
- // Empties out the current pool into
- // the buffer. Calls 'dump()' if the
- // buffer is full.
- void empty()
- {
- buffer[curr_pos++]=pool;
- curr_bit=0;
- pool=0;
- if(curr_pos==255)dump();
- }
-
- // If there is anything in the
- // buffer or in the pool, it
- // dumps it to the filestream.
- // Buffer and pool are cleared.
- void dump()
- {
- if(curr_bit)
- empty();
- if(curr_pos || curr_bit)
- {
- fputc(curr_pos,file.get());
- fwrite(buffer,curr_pos,1,file.get());
- curr_pos=0;
- }
- }
-
- // Pushes a symbol of the given size
- // onto the bitstream.
- void push_value(int value, int size)
- {
- int i;
- for(i=0;i<size;i++)
- push_bit((value>>(i))&1);
- }
- };
-
- // Class for dealing with the LZW codes
- struct lzwcode
- {
- int value; // the data element or character
- int code; // lzwcode
- struct lzwcode* kids; // children of this node
- struct lzwcode* next; // siblings of this node
-
- lzwcode():value(0),code(0),kids(0),next(0) { }
-
- lzwcode *FindCode(int value)
- {
- lzwcode *node=this;
-
- // check the children (kids) of the node for the value
- for (node = node->kids; node != 0; node = node->next)
- if (node->value == value)
- return(node);
- return(0);
- }
-
- void AddNode(unsigned short code, unsigned short value)
- {
- lzwcode *n = new lzwcode;
-
- // add a new child to node; the child will have code and value
- n->value = value;
- n->code = code;
- n->kids = 0;
- n->next = this->kids;
- this->kids = n;
- }
-
- static lzwcode * NewTable(int values)
- {
- int i;
- lzwcode * table = new lzwcode;
-
- table->kids = 0;
- for (i = 0; i < values; i++)
- table->AddNode( i, i);
-
- return(table);
- }
-
- // Destructor just deletes any
- // children and siblings.
- ~lzwcode()
- {
- if(kids)
- delete kids;
- if(next)
- delete next;
- }
- };
-
-private:
- bitstream bs;
- synfig::String filename;
- synfig::SmartFILE file;
- int
- i, // General-purpose index
- codesize, // Current code size
- rootsize, // Size of pixel bits (will be recalculated)
- nextcode; // Next code to use
- lzwcode *table,*next,*node;
-
- synfig::Surface curr_surface;
- etl::surface<unsigned char> curr_frame;
- etl::surface<unsigned char> prev_frame;
-
- int imagecount;
- int cur_scanline;
-
-
- // GIF compression parameters
- bool lossy;
- bool multi_image;
- bool dithering;
- int color_bits;
- int iframe_density;
- int loop_count;
- bool local_palette;
-
- synfig::Palette curr_palette;
-
- void output_curr_palette();
-
-public:
- gif(const char *filename);
-
- virtual bool set_rend_desc(synfig::RendDesc *desc);
- virtual bool init();
- virtual bool start_frame(synfig::ProgressCallback *cb);
- virtual void end_frame();
-
- virtual ~gif();
-
- virtual synfig::Color * start_scanline(int scanline);
- virtual bool end_scanline(void);
-
-};
-
-/* === E N D =============================================================== */
-
-#endif
projects / synfig.git / blobdiff