--- /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