+++ /dev/null
-/* === S Y N F I G ========================================================= */
-/*! \file trgt_gif.cpp
-** \brief BMP Target Module
-**
-** $Id$
-**
-** \legal
-** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
-** Copyright (c) 2007 Chris Moore
-**
-** 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 ===========================================================
-**
-** ========================================================================= */
-
-/* === H E A D E R S ======================================================= */
-
-#define SYNFIG_TARGET
-
-#ifdef USING_PCH
-# include "pch.h"
-#else
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include <ETL/stringf>
-#include "trgt_gif.h"
-#include <stdio.h>
-#endif
-
-/* === M A C R O S ========================================================= */
-
-using namespace synfig;
-using namespace std;
-using namespace etl;
-
-#define MAX_FRAME_RATE (20.0)
-
-/* === G L O B A L S ======================================================= */
-
-SYNFIG_TARGET_INIT(gif);
-SYNFIG_TARGET_SET_NAME(gif,"gif");
-SYNFIG_TARGET_SET_EXT(gif,"gif");
-SYNFIG_TARGET_SET_VERSION(gif,"0.1");
-SYNFIG_TARGET_SET_CVS_ID(gif,"$Id$");
-
-/* === M E T H O D S ======================================================= */
-
-gif::gif(const char *filename_):
- filename(filename_),
- file( (filename=="-")?stdout:fopen(filename_,POPEN_BINARY_WRITE_TYPE) ),
- imagecount(0),
-
- lossy(true),
- multi_image(false),
- dithering(true),
- color_bits(8),
- iframe_density(30),
- loop_count(0x7fff),
- local_palette(true)
-{
-}
-
-gif::~gif()
-{
- if(file)
- fputc(';',file.get()); // Image terminator
-}
-
-bool
-gif::set_rend_desc(RendDesc *given_desc)
-{
- if(given_desc->get_frame_rate()>MAX_FRAME_RATE)
- given_desc->set_frame_rate(MAX_FRAME_RATE);
-
- desc=*given_desc;
-
- if(desc.get_frame_end()-desc.get_frame_start()>0)
- {
- multi_image=true;
- //set_remove_alpha();
- imagecount=desc.get_frame_end()-desc.get_frame_start();
- }
- else
- multi_image=false;
- return true;
-}
-
-bool
-gif::init()
-{
- int w=desc.get_w(),h=desc.get_h();
-
- if(!file)
- {
- synfig::error(strprintf(_("Unable to open \"%s\" for write access!"),filename.c_str()));
- return false;
- }
-
- rootsize=color_bits; // Size of pixel bits
-
- curr_frame.set_wh(w,h);
- prev_frame.set_wh(w,h);
- curr_surface.set_wh(w,h);
- curr_frame.clear();
- prev_frame.clear();
- curr_surface.clear();
-
- if(get_quality()>5)
- lossy=true;
- else
- lossy=false;
-
- // Output the header
- fprintf(file.get(),"GIF89a");
- fputc(w&0x000000ff,file.get());
- fputc((w&0x0000ff00)>>8,file.get());
- fputc(h&0x000000ff,file.get());
- fputc((h&0x0000ff00)>>8,file.get());
- if(!local_palette)
- fputc(0xF0+(rootsize-1),file.get()); // flags
- else
- fputc((0xF0+(rootsize-1))&~(1<<7),file.get()); // flags
-
- fputc(0,file.get()); // background color
- fputc(0,file.get()); // Pixel Aspect Ratio
-
- if(!local_palette)
- {
- curr_palette=Palette::grayscale(256/(1<<(8-rootsize))-1);
- output_curr_palette();
- }
-
- if(loop_count && multi_image)
- {
- fputc(33,file.get()); // 33 (hex 0x21) GIF Extension code
- fputc(255,file.get()); // 255 (hex 0xFF) Application Extension Label
- fputc(11,file.get()); // 11 (hex (0x0B) Length of Application Block
- fprintf(file.get(),"NETSCAPE2.0");
- fputc(3,file.get()); // 3 (hex 0x03) Length of Data Sub-Block
- fputc(1,file.get()); // 1 (hex 0x01)
- fputc(loop_count&0x000000ff,file.get());
- fputc((loop_count&0x0000ff00)>>8,file.get());
- fputc(0,file.get()); // 0 (hex 0x00) a Data Sub-block Terminator.
- }
-
- return true;
-}
-
-void
-gif::output_curr_palette()
-{
- // Output the color table
- for(i=0;i<256/(1<<(8-rootsize));i++)
- {
- if(i<(signed)curr_palette.size())
- {
- Color color(curr_palette[i].color.clamped());
- //fputc(i*(1<<(8-rootsize)),file.get());
- //fputc(i*(1<<(8-rootsize)),file.get());
- //fputc(i*(1<<(8-rootsize)),file.get());
- fputc(gamma().r_F32_to_U8(color.get_r()),file.get());
- fputc(gamma().g_F32_to_U8(color.get_g()),file.get());
- fputc(gamma().b_F32_to_U8(color.get_b()),file.get());
- }
- else
- {
- fputc(255,file.get());
- fputc(0,file.get());
- fputc(255,file.get());
- }
- }
-}
-
-bool
-gif::start_frame(synfig::ProgressCallback *callback)
-{
-// int
-// w=desc.get_w(),
-// h=desc.get_h();
-
- if(!file)
- {
- if(callback)callback->error(string("BUG:")+_("Description not set!"));
- return false;
- }
-
- if(callback)callback->task(filename+strprintf(" %d",imagecount));
-
-
-
- return true;
-}
-
-void
-gif::end_frame()
-{
- int w=desc.get_w(),h=desc.get_h(),i;
- unsigned int value;
- int
- delaytime=round_to_int(100.0/desc.get_frame_rate());
-
- bool build_off_previous(multi_image);
-
- Palette prev_palette(curr_palette);
-
- // Fill in the background color
- if(!get_remove_alpha())
- {
- Surface::alpha_pen pen(curr_surface.begin(),1.0,Color::BLEND_BEHIND);
- pen.set_value(get_canvas()->rend_desc().get_bg_color());
- for(int y=0;y<curr_surface.get_h();y++,pen.inc_y())
- {
- int x;
- for(x=0;x<curr_surface.get_w();x++,pen.inc_x())
- {
- if(pen.get_value().get_a()>0.1)
- pen.put_value();
- else
- pen[0][0]=Color::alpha();
- }
- pen.dec_x(x);
- }
- }
-
- if(local_palette)
- {
- curr_palette=Palette(curr_surface,256/(1<<(8-rootsize))-build_off_previous-1);
- synfig::info("curr_palette.size()=%d",curr_palette.size());
- }
-
- int transparent_index(curr_palette.find_closest(Color(1,0,1,0))-curr_palette.begin());
- bool has_transparency(curr_palette[transparent_index].color.get_a()<=0.00001);
-
- if(has_transparency)
- build_off_previous=false;
-
- if(build_off_previous)
- {
- transparent_index=0;
- has_transparency=true;
- }
-
-#define DISPOSE_UNDEFINED (0)
-#define DISPOSE_NONE (1<<2)
-#define DISPOSE_RESTORE_BGCOLOR (2<<2)
-#define DISPOSE_RESTORE_PREVIOUS (3<<2)
- int gec_flags(0);
- if(build_off_previous)
- gec_flags|=DISPOSE_NONE;
- else
- gec_flags|=DISPOSE_RESTORE_PREVIOUS;
- if(has_transparency)
- gec_flags|=1;
-
- // output the Graphic Control Extension
- fputc(0x21,file.get()); // Extension introducer
- fputc(0xF9,file.get()); // Graphic Control Label
- fputc(4,file.get()); // Block Size
- fputc(gec_flags,file.get()); // Flags (Packed Fields)
- fputc(delaytime&0x000000ff,file.get()); // Delay Time (MSB)
- fputc((delaytime&0x0000ff00)>>8,file.get()); // Delay Time (LSB)
- fputc(transparent_index,file.get()); // Transparent Color Index
- fputc(0,file.get()); // Block Terminator
-
- // output the image header
- fputc(',',file.get());
- fputc(0,file.get()); // image left
- fputc(0,file.get()); // image left
- fputc(0,file.get()); // image top
- fputc(0,file.get()); // image top
- fputc(w&0x000000ff,file.get());
- fputc((w&0x0000ff00)>>8,file.get());
- fputc(h&0x000000ff,file.get());
- fputc((h&0x0000ff00)>>8,file.get());
- if(local_palette)
- fputc(0x80|(rootsize-1),file.get()); // flags
- else
- fputc(0x00+ rootsize-1,file.get()); // flags
-
-
- if(local_palette)
- {
- Palette out(curr_palette);
-
- if(build_off_previous)
- curr_palette.insert(curr_palette.begin(),Color(1,0,1,0));
- output_curr_palette();
- curr_palette=out;
- }
-
- bs=bitstream(file);
-
- // Prepare ourselves for LZW compression
- codesize=rootsize+1;
- nextcode=(1<<rootsize)+2;
- table=lzwcode::NewTable((1<<rootsize));
- node=table;
-
- // Output the rootsize
- fputc(rootsize,file.get()); // rootsize;
-
- // Push a table reset into the bitstream
- bs.push_value(1<<rootsize,codesize);
-
- for(int cur_scanline=0;cur_scanline<desc.get_h();cur_scanline++)
- {
- //convert_color_format(curr_frame[cur_scanline], curr_surface[cur_scanline], desc.get_w(), PF_GRAY, gamma());
-
- // Now we compress it!
- for(i=0;i<w;i++)
- {
- Color color(curr_surface[cur_scanline][i].clamped());
- Palette::iterator iter(curr_palette.find_closest(color));
-
- if(dithering)
- {
- Color error(color-iter->color);
- //error*=0.25;
- if(curr_surface.get_h()>cur_scanline+1)
- {
- curr_surface[cur_scanline+1][i-1] += error * ((float)3/(float)16);
- curr_surface[cur_scanline+1][i] += error * ((float)5/(float)16);
- if(curr_surface.get_w()>i+1)
- curr_surface[cur_scanline+1][i+1] += error * ((float)1/(float)16);
- }
- if(curr_surface.get_w()>i+1)
- curr_surface[cur_scanline][i+1] += error * ((float)7/(float)16);
- }
-
- curr_frame[cur_scanline][i]=iter-curr_palette.begin();
-
- value=curr_frame[cur_scanline][i];
- if(build_off_previous)
- value++;
- if(value>(unsigned)(1<<rootsize)-1)
- value=(1<<rootsize)-1;
-
- // If the pixel is the same as the one that
- // is already there, then we should make it
- // transparent
- if(build_off_previous)
- {
- if(lossy)
- {
-
- // Lossy
- if(
- abs( ( iter->color-prev_palette[prev_frame[cur_scanline][i]-1].color ).get_y() ) > (1.0/16.0) ||
-// abs((int)value-(int)prev_frame[cur_scanline][i])>2||
-// (value<=2 && value!=prev_frame[cur_scanline][i]) ||
- (imagecount%iframe_density)==0 || imagecount==desc.get_frame_end()-1 ) // lossy version
- prev_frame[cur_scanline][i]=value;
- else
- {
- prev_frame[cur_scanline][i]=value;
- value=0;
- }
- }
- else
- {
- // lossless version
- if(value!=prev_frame[cur_scanline][i])
- prev_frame[cur_scanline][i]=value;
- else
- value=0;
- }
- }
- else
- prev_frame[cur_scanline][i]=value;
-
- next=node->FindCode(value);
- if(next)
- node=next;
- else
- {
- node->AddNode(nextcode, value);
- bs.push_value(node->code, codesize);
- node = table->FindCode(value);
-
- // Check to see if we need to increase the codesize
- if (nextcode == ( 1 << codesize))
- codesize += 1;
-
- nextcode += 1;
-
- // check to see if we have filled up the table
- if (nextcode == 4096)
- {
- // output the clear code: make sure to use the current
- // codesize
- bs.push_value((unsigned) 1 << rootsize, codesize);
-
- delete table;
- table = lzwcode::NewTable((1<<rootsize));
- codesize = rootsize + 1;
- nextcode = (1 << rootsize) + 2;
-
- // since we have a new table, need the correct prefix
- node = table->FindCode(value);
- }
- }
- }
- }
-
-
-
-
-
- // Push the last code onto the bitstream
- bs.push_value(node->code,codesize);
-
- // Push a end-of-stream code onto the bitstream
- bs.push_value((1<<rootsize)+1,codesize);
-
- // Make sure everything is dumped out
- bs.dump();
-
- delete table;
-
- fputc(0,file.get()); // Block terminator
-
- fflush(file.get());
- imagecount++;
-}
-
-synfig::Color*
-gif::start_scanline(int scanline)
-{
- cur_scanline=scanline;
- return curr_surface[scanline];
-}
-
-bool
-gif::end_scanline()
-{
- if(!file)
- return false;
-
-// int w=desc.get_w(),i;
-// unsigned int value;
-
-
- return true;
-}
projects / synfig.git / blobdiff