X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=inline;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_gif%2Ftrgt_gif.h;fp=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_gif%2Ftrgt_gif.h;h=381baed398ffdb29e617ccde1011162ce27902d2;hb=16b3beced25134bef064705568ecb893a6be4e79;hp=0000000000000000000000000000000000000000;hpb=5a1d028f56182922addfed8f1f1c28fdde12756c;p=synfig.git

diff --git a/synfig-core/trunk/src/modules/mod_gif/trgt_gif.h b/synfig-core/trunk/src/modules/mod_gif/trgt_gif.h
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+/*! ========================================================================
+** Sinfg
+** Template Header File
+** $Id: trgt_gif.h,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This software and associated documentation
+** are CONFIDENTIAL and PROPRIETARY property of
+** the above-mentioned copyright holder.
+**
+** You may not copy, print, publish, or in any
+** other way distribute this software without
+** a prior written agreement with
+** the copyright holder.
+**
+** === N O T E S ===========================================================
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SINFG_TRGT_GIF_H
+#define __SINFG_TRGT_GIF_H
+
+/* === H E A D E R S ======================================================= */
+
+#include <sinfg/target_scanline.h>
+#include <sinfg/string.h>
+#include <sinfg/smartfile.h>
+#include <cstdio>
+#include <sinfg/surface.h>
+#include <sinfg/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 sinfg::Target_Scanline
+{
+	SINFG_TARGET_MODULE_EXT
+private:
+	// Class for abstracting the
+	// output of the codes
+	struct bitstream
+	{
+		sinfg::SmartFILE file;
+		unsigned char pool;
+		char curr_bit;
+		bitstream():pool(0),curr_bit(0),curr_pos(0) {}
+		bitstream(sinfg::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();
+		}
+		
+		// Emptys 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 sibblings.
+		~lzwcode()
+		{
+			if(kids)
+				delete kids;
+			if(next)
+				delete next;
+		}
+	};
+
+private:
+	bitstream bs;
+	sinfg::String filename;
+	sinfg::SmartFILE file;
+	int 
+		i,			// General-purpose index
+		codesize,	// Current code size
+		rootsize,	// Size of pixel bits (will be recalculted)
+		nextcode;	// Next code to use
+	lzwcode *table,*next,*node;
+	
+	sinfg::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;
+	
+	sinfg::Palette curr_palette;
+	
+	void output_curr_palette();
+	
+public:
+	gif(const char *filename);
+
+	virtual bool set_rend_desc(sinfg::RendDesc *desc);
+	virtual bool init();
+	virtual bool start_frame(sinfg::ProgressCallback *cb);
+	virtual void end_frame();
+
+	virtual ~gif();
+	
+	virtual sinfg::Color * start_scanline(int scanline);
+	virtual bool end_scanline(void);
+
+};
+
+/* === E N D =============================================================== */
+
+#endif