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747 lines
36 KiB
747 lines
36 KiB
//********** pngwriter.h **********************************************
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// Author: Paul Blackburn
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//
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// Email: individual61@users.sourceforge.net
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//
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// Version: 0.5.4 (19 / II / 2009)
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//
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// Description: Library that allows plotting a 48 bit
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// PNG image pixel by pixel, which can
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// then be opened with a graphics program.
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//
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// License: GNU General Public License
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// Copyright 2002, 2003, 2004, 2005, 2006, 2007,
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// 2008, 2009 Paul Blackburn
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//
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// Website: Main: http://pngwriter.sourceforge.net/
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// Sourceforge.net: http://sourceforge.net/projects/pngwriter/
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// Freshmeat.net: http://freshmeat.net/projects/pngwriter/
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//
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// Documentation: This header file is commented, but for a
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// quick reference document, and support,
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// take a look at the website.
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//
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//*************************************************************************
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* */
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#ifndef PNGWRITER_H
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#define PNGWRITER_H 1
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#define PNGWRITER_VERSION 0.54
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#define NO_FREETYPE
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#include <png.h>
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// REMEMBER TO ADD -DNO_FREETYPE TO YOUR COMPILATION FLAGS IF PNGwriter WAS
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// COMPILED WITHOUT FREETYPE SUPPORT!!!
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//
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// RECUERDA AGREGAR -DNO_FREETYPE A TUS OPCIONES DE COMPILACION SI PNGwriter
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// FUE COMPILADO SIN SOPORTE PARA FREETYPE!!!
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//
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#ifndef NO_FREETYPE
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#endif
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#ifdef OLD_CPP // For compatibility with older compilers.
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#include <iostream.h>
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#include <math.h>
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#include <wchar.h>
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#include <string.h>
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using namespace std;
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#endif // from ifdef OLD_CPP
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#ifndef OLD_CPP // Default situation.
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#include <iostream>
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#include <cmath>
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#include <cwchar>
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#include <string>
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#endif // from ifndef OLD_CPP
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//png.h must be included before FreeType headers.
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#include <stdlib.h>
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#include <stdio.h>
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#include <setjmp.h>
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#define PNG_BYTES_TO_CHECK (4)
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#define PNGWRITER_DEFAULT_COMPRESSION (0)
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class pngwriter {
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private:
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char* filename_;
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char* textauthor_;
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char* textdescription_;
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char* texttitle_;
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char* textsoftware_;
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bool should_free;
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int height_;
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int width_;
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int backgroundcolour_;
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int bit_depth_;
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int rowbytes_;
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int colortype_;
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int compressionlevel_;
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bool transformation_; // Required by Mikkel's patch
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unsigned char * * graph_;
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double filegamma_;
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double screengamma_;
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void circle_aux(int xcentre, int ycentre, int x, int y, int red, int green, int blue);
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void circle_aux_blend(int xcentre, int ycentre, int x, int y, double opacity, int red, int green, int blue);
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int check_if_png(char* file_name, FILE** fp);
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int read_png_info(FILE* fp, png_structp* png_ptr, png_infop* info_ptr);
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int read_png_image(FILE* fp, png_structp png_ptr, png_infop info_ptr,
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png_bytepp* image, png_uint_32* width, png_uint_32* height);
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void flood_fill_internal(int xstart, int ystart, double start_red, double start_green, double start_blue, double fill_red, double fill_green, double fill_blue);
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void flood_fill_internal_blend(int xstart, int ystart, double opacity, double start_red, double start_green, double start_blue, double fill_red, double fill_green, double fill_blue);
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#ifndef NO_FREETYPE
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void my_draw_bitmap(FT_Bitmap* bitmap, int x, int y, double red, double green, double blue);
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void my_draw_bitmap_blend(FT_Bitmap* bitmap, int x, int y,double opacity, double red, double green, double blue);
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#endif
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/* The algorithms HSVtoRGB and RGBtoHSV were found at http://www.cs.rit.edu/~ncs/
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* which is a page that belongs to Nan C. Schaller, though
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* these algorithms appear to be the work of Eugene Vishnevsky.
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* */
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void HSVtoRGB(double* r, double* g, double* b, double h, double s, double v);
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void RGBtoHSV(float r, float g, float b, float* h, float* s, float* v);
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/* drwatop(), drawbottom() and filledtriangle() were contributed by Gurkan Sengun
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* ( <gurkan@linuks.mine.nu>, http://www.linuks.mine.nu/ )
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* */
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void drawtop(long x1,long y1,long x2,long y2,long x3, int red, int green, int blue);
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void drawbottom(long x1,long y1,long x2,long x3,long y3, int red, int green, int blue);
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void drawbottom_blend(long x1,long y1,long x2,long x3,long y3, double opacity, int red, int green, int blue);
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void drawtop_blend(long x1,long y1,long x2,long y2,long x3, double opacity, int red, int green, int blue);
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public:
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/* General Notes
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* It is important to remember that all functions that accept an argument of type "const char *" will also
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* accept "char *", this is done so you can have a changing filename (to make many PNG images in series
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* with a different name, for example), and to allow you to use string type objects which can be easily
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* turned into const char * (if theString is an object of type string, then it can be used as a const char *
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* by saying theString.c_str()).
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* It is also important to remember that whenever a function has a colour coeffiecient as its argument,
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* that argument can be either an int from 0 to 65535 or a double from 0.0 to 1.0.
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* It is important to make sure that you are calling the function with the type that you want.
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* Remember that 1 is an int, while 1.0 is a double, and will thus determine what version of the function
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* will be used. Similarly, do not make the mistake of calling for example plot(x, y, 0.0, 0.0, 65535),
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* because
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* there is no plot(int, int, double, double, int).
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* Also, please note that plot() and read() (and the functions that use them internally)
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* are protected against entering, for example, a colour coefficient that is over 65535
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* or over 1.0. Similarly, they are protected against negative coefficients. read() will return 0
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* when called outside the image range. This is actually useful as zero-padding should you need it.
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* */
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/* Compilation
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* A typical compilation would look like this:
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*
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* g++ my_program.cc -o my_program freetype-config --cflags \
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* -I/usr/local/include -L/usr/local/lib -lpng -lpngwriter -lz -lfreetype
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*
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* If you did not compile PNGwriter with FreeType support, then remove the
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* FreeType-related flags and add -DNO_FREETYPE above.
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* */
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/* Constructor
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* The constructor requires the width and the height of the image, the background colour for the
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* image and the filename of the file (a pointer or simple "myfile.png"). The background colour
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* can only be initialized to a shade of grey (once the object has been created you can do whatever
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* you want, though), because generally one wants either a white (65535 or 1.0) or a black (0 or 0.0)
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* background to start with.
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* The default constructor creates a PNGwriter instance that is 250x250, white background,
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* and filename "out.png".
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* Tip: The filename can be given as easily as:
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* pngwriter mypng(300, 300, 0.0, "myfile.png");
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* Tip: If you are going to create a PNGwriter instance for reading in a file that already exists,
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* then width and height can be 1 pixel, and the size will be automatically adjusted once you use
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* readfromfile().
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* */
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pngwriter();
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pngwriter(const pngwriter& rhs);
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pngwriter(int width, int height, int backgroundcolour, char* filename);
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pngwriter(int width, int height, double backgroundcolour, char* filename);
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pngwriter(int width, int height, int backgroundcolour, const char* filename);
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pngwriter(int width, int height, unsigned char * data, const char* filename);
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pngwriter(int width, int height, double backgroundcolour, const char* filename);
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/* Destructor
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* */
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~pngwriter();
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/* Assignment Operator
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* */
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pngwriter& operator = (const pngwriter& rhs);
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/* Plot
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* With this function a pixel at coordinates (x, y) can be set to the desired colour.
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* The pixels are numbered starting from (1, 1) and go to (width, height).
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* As with most functions in PNGwriter, it has been overloaded to accept either int arguments
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* for the colour coefficients, or those of type double. If they are of type int,
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* they go from 0 to 65535. If they are of type double, they go from 0.0 to 1.0.
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* Tip: To plot using red, then specify plot(x, y, 1.0, 0.0, 0.0). To make pink,
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* just add a constant value to all three coefficients, like this:
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* plot(x, y, 1.0, 0.4, 0.4).
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* Tip: If nothing is being plotted to your PNG file, make sure that you remember
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* to close() the instance before your program is finished, and that the x and y position
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* is actually within the bounds of your image. If either is not, then PNGwriter will
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* not complain-- it is up to you to check for this!
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* Tip: If you try to plot with a colour coefficient out of range, a maximum or minimum
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* coefficient will be assumed, according to the given coefficient. For example, attempting
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* to plot plot(x, y, 1.0,-0.2,3.7) will set the green coefficient to 0 and the red coefficient
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* to 1.0.
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* */
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void plot(int x, int y, int red, int green, int blue);
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void plot(int x, int y, double red, double green, double blue);
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/* Plot HSV
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* With this function a pixel at coordinates (x, y) can be set to the desired colour,
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* but with the colour coefficients given in the Hue, Saturation, Value colourspace.
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* This has the advantage that one can determine the colour that will be plotted with
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* only one parameter, the Hue. The colour coefficients must go from 0 to 65535 and
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* be of type int, or be of type double and go from 0.0 to 1.0.
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* */
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void plotHSV(int x, int y, double hue, double saturation, double value);
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void plotHSV(int x, int y, int hue, int saturation, int value);
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/* Read
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* With this function we find out what colour the pixel (x, y) is. If "colour" is 1,
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* it will return the red coefficient, if it is set to 2, the green one, and if
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* it set to 3, the blue colour coefficient will be returned,
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* and this returned value will be of type int and be between 0 and 65535.
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* Note that if you call read() on a pixel outside the image range, the value returned
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* will be 0.
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* */
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int read(int x, int y, int colour);
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/* Read, Average
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* Same as the above, only that the average of the three colour coefficients is returned.
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*/
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int read(int x, int y);
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/* dRead
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* With this function we find out what colour the pixel (x, y) is. If "colour" is 1,
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* it will return the red coefficient, if it is set to 2, the green one, and if
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* it set to 3, the blue colour coefficient will be returned,
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* and this returned value will be of type double and be between 0.0 and 1.0.
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* Note that if you call dread() outside the image range, the value returned will be 0.0
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* */
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double dread(int x, int y, int colour);
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/* dRead, Average
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* Same as the above, only that the average of the three colour coefficients is returned.
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*/
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double dread(int x, int y);
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/* Read HSV
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* With this function we find out what colour the pixel (x, y) is, but in the Hue,
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* Saturation, Value colourspace. If "colour" is 1,
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* it will return the Hue coefficient, if it is set to 2, the Saturation one, and if
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* it set to 3, the Value colour coefficient will be returned, and this returned
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* value will be of type int and be between 0 and 65535. Important: If you attempt
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* to read the Hue of a pixel that is a shade of grey, the value returned will be
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* nonsensical or even NaN. This is just the way the RGB -> HSV algorithm works:
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* the Hue of grey is not defined. You might want to check whether the pixel
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* you are reading is grey before attempting a readHSV().
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* Tip: This is especially useful for categorizing sections of the image according
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* to their colour.
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* */
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int readHSV(int x, int y, int colour);
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/* dRead HSV
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* With this function we find out what colour the pixel (x, y) is, but in the Hue,
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* Saturation, Value colourspace. If "colour" is 1,
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* it will return the Hue coefficient, if it is set to 2, the Saturation one, and if
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* it set to 3, the Value colour coefficient will be returned,
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* and this returned value will be of type double and be between 0.0 and 1.0.
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* */
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double dreadHSV(int x, int y, int colour);
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/* Clear
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* The whole image is set to black.
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* */
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void clear(void);
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/* Close
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* Close the instance of the class, and write the image to disk.
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* Tip: If you do not call this function before your program ends, no image
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* will be written to disk.
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* */
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void close(void);
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/* Rename
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* To rename the file once an instance of pngwriter has been created.
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* Useful for assigning names to files based upon their content.
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* Tip: This is as easy as calling pngwriter_rename("newname.png")
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* If the argument is a long unsigned int, for example 77, the filename will be changed to
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* 0000000077.png
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* Tip: Use this to create sequences of images for movie generation.
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* */
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void pngwriter_rename(char* newname);
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void pngwriter_rename(const char* newname);
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void pngwriter_rename(long unsigned int index);
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/* Figures
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* These functions draw basic shapes. Available in both int and double versions.
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* The line functions use the fast Bresenham algorithm. Despite the name,
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* the square functions draw rectangles. The circle functions use a fast
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* integer math algorithm. The filled circle functions make use of sqrt().
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* */
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void line(int xfrom, int yfrom, int xto, int yto, int red, int green,int blue);
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void line(int xfrom, int yfrom, int xto, int yto, double red, double green,double blue);
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void triangle(int x1, int y1, int x2, int y2, int x3, int y3, int red, int green, int blue);
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void triangle(int x1, int y1, int x2, int y2, int x3, int y3, double red, double green, double blue);
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void square(int xfrom, int yfrom, int xto, int yto, int red, int green,int blue);
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void square(int xfrom, int yfrom, int xto, int yto, double red, double green,double blue);
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void filledsquare(int xfrom, int yfrom, int xto, int yto, int red, int green,int blue);
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void filledsquare(int xfrom, int yfrom, int xto, int yto, double red, double green,double blue);
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void circle(int xcentre, int ycentre, int radius, int red, int green, int blue);
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void circle(int xcentre, int ycentre, int radius, double red, double green, double blue);
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void filledcircle(int xcentre, int ycentre, int radius, int red, int green, int blue);
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void filledcircle(int xcentre, int ycentre, int radius, double red, double green, double blue);
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/* Read From File
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* Open the existing PNG image, and copy it into this instance of the class. It is important to mention
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* that PNG variants are supported. Very generally speaking, most PNG files can now be read (as of version 0.5.4),
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* but if they have an alpha channel it will be completely stripped. If the PNG file uses GIF-style transparency
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* (where one colour is chosen to be transparent), PNGwriter will not read the image properly, but will not
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* complain. Also, if any ancillary chunks are included in the PNG file (chroma, filter, etc.), it will render
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* with a slightly different tonality. For the vast majority of PNGs, this should not be an issue. Note:
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* If you read an 8-bit PNG, the internal representation of that instance of PNGwriter will be 8-bit (PNG
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* files of less than 8 bits will be upscaled to 8 bits). To convert it to 16-bit, just loop over all pixels,
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* reading them into a new instance of PNGwriter. New instances of PNGwriter are 16-bit by default.
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* */
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void readfromfile(char* name);
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void readfromfile(const char* name);
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/* Get Height
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* When you open a PNG with readfromfile() you can find out its height with this function.
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* */
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int getheight(void);
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/* Get Width
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* When you open a PNG with readfromfile() you can find out its width with this function.
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* */
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int getwidth(void);
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/* Set Compression Level
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* Set the compression level that will be used for the image. -1 is to use the default,
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* 0 is none, 9 is best compression.
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* Remember that this will affect how long it will take to close() the image. A value of 2 or 3
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* is good enough for regular use, but for storage or transmission you might want to take the time
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* to set it at 9.
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* */
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void setcompressionlevel(int level);
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/* Get Bit Depth
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* When you open a PNG with readfromfile() you can find out its bit depth with this function.
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* Mostly for troubleshooting uses.
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* */
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int getbitdepth(void);
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/* Get Colour Type
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* When you open a PNG with readfromfile() you can find out its colour type (libpng categorizes
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* different styles of image data with this number).
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* Mostly for troubleshooting uses.
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* */
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int getcolortype(void);
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/* Set Gamma Coeff
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* Set the image's gamma (file gamma) coefficient. This is experimental, but use it if your image's colours seem too bright
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* or too dark. The default value of 0.5 should be fine. The standard disclaimer about Mac and PC gamma
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* settings applies.
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* */
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void setgamma(double gamma);
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/* Get Gamma Coeff
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* Get the image's gamma coefficient. This is experimental.
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* */
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double getgamma(void);
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/* Bezier Curve
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* (After Frenchman Pierre B�zier from Regie Renault)
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* A collection of formulae for describing curved lines
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* and surfaces, first used in 1972 to model automobile surfaces.
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* (from the The Free On-line Dictionary of Computing)
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* See http://www.moshplant.com/direct-or/bezier/ for one of many
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* available descriptions of bezier curves.
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* There are four points used to define the curve: the two endpoints
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* of the curve are called the anchor points, while the other points,
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* which define the actual curvature, are called handles or control points.
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* Moving the handles lets you modify the shape of the curve.
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* */
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void bezier(int startPtX, int startPtY,
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int startControlX, int startControlY,
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int endPtX, int endPtY,
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int endControlX, int endControlY,
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double red, double green, double blue);
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void bezier(int startPtX, int startPtY,
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int startControlX, int startControlY,
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int endPtX, int endPtY,
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int endControlX, int endControlY,
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int red, int green, int blue);
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/* Set Text
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* Sets the text information in the PNG header. If it is not called, the default is used.
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*/
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void settext(char* title, char* author, char* description, char* software);
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void settext(const char* title, const char* author, const char* description, const char* software);
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/* Version Number
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* Returns the PNGwriter version number.
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*/
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static double version(void);
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/* Write PNG
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* Writes the PNG image to disk. You can still change the PNGwriter instance after this.
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* Tip: This is exactly the same as close(), but easier to remember.
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* Tip: To make a sequence of images using only one instance of PNGwriter, alter the image, change its name,
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* write_png(), then alter the image, change its name, write_png(), etc.
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*/
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void write_png(void);
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/* Plot Text
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* Uses the Freetype2 library to set text in the image. face_path is the file path to a
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* TrueType font file (.ttf) (FreeType2 can also handle other types). fontsize specifices the approximate
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* height of the rendered font in pixels. x_start and y_start specify the placement of the
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* lower, left corner of the text string. angle is the text angle in radians. text is the text to be rendered.
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* The colour coordinates can be doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* Tip: PNGwriter installs a few fonts in /usr/local/share/pngwriter/fonts to get you started.
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* Tip: Remember to add -DNO_FREETYPE to your compilation flags if PNGwriter was compiled without FreeType support.
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* */
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void plot_text(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double red, double green, double blue);
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void plot_text(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, int red, int green, int blue);
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/* Plot UTF-8 Text
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* Same as the above, but the text to be plotted is encoded in UTF-8. Why would you want this? To be able to plot
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* all characters available in a large TrueType font, for example: for rendering Japenese, Chinese and other
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* languages not restricted to the standard 128 character ASCII space.
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* Tip: The quickest way to get a string into UTF-8 is to write it in an adequate text editor, and save it as a file
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* in UTF-8 encoding, which can then be read in in binary mode.
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* */
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void plot_text_utf8(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double red, double green, double blue);
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void plot_text_utf8(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, int red, int green, int blue);
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/* Bilinear Interpolation of Image
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* Given a floating point coordinate (x from 0.0 to width, y from 0.0 to height),
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* this function will return the interpolated colour intensity specified by
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* colour (where red = 1, green = 2, blue = 3).
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* bilinear_interpolate_read() returns an int from 0 to 65535, and
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* bilinear_interpolate_dread() returns a double from 0.0 to 1.0.
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* Tip: Especially useful for enlarging an image.
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* */
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int bilinear_interpolation_read(double x, double y, int colour);
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double bilinear_interpolation_dread(double x, double y, int colour);
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/* Plot Blend
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* Plots the colour given by red, green blue, but blended with the existing pixel
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* value at that position. opacity is a double that goes from 0.0 to 1.0.
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* 0.0 will not change the pixel at all, and 1.0 will plot the given colour.
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* Anything in between will be a blend of both pixel levels. Please note: This is neither
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* alpha channel nor PNG transparency chunk support. This merely blends the plotted pixels.
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* */
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void plot_blend(int x, int y, double opacity, int red, int green, int blue);
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void plot_blend(int x, int y, double opacity, double red, double green, double blue);
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/* Invert
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* Inverts the image in RGB colourspace.
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* */
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void invert(void);
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/* Resize Image
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* Resizes the PNGwriter instance. Note: All image data is set to black (this is
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* a resizing, not a scaling, of the image).
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* */
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void resize(int width, int height);
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/* Boundary Fill
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* All pixels adjacent to the start pixel will be filled with the fill colour, until the boundary colour is encountered.
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* For example, calling boundary_fill() with the boundary colour set to red, on a pixel somewhere inside a red circle,
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* will fill the entire circle with the desired fill colour. If, on the other hand, the circle is not the boundary colour,
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* the rest of the image will be filled.
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* The colour components are either doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* */
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void boundary_fill(int xstart, int ystart, double boundary_red,double boundary_green,double boundary_blue,double fill_red, double fill_green, double fill_blue) ;
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void boundary_fill(int xstart, int ystart, int boundary_red,int boundary_green,int boundary_blue,int fill_red, int fill_green, int fill_blue) ;
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/* Flood Fill
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* All pixels adjacent to the start pixel will be filled with the fill colour, if they are the same colour as the
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* start pixel. For example, calling flood_fill() somewhere in the interior of a solid blue rectangle will colour
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* the entire rectangle the fill colour. The colour components are either doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* */
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void flood_fill(int xstart, int ystart, double fill_red, double fill_green, double fill_blue) ;
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void flood_fill(int xstart, int ystart, int fill_red, int fill_green, int fill_blue) ;
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/* Polygon
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* This function takes an array of integer values containing the coordinates of the vertexes of a polygon.
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* Note that if you want a closed polygon, you must repeat the first point's coordinates for the last point.
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* It also requires the number of points contained in the array. For example, if you wish to plot a triangle,
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* the array will contain 6 elements, and the number of points is 3. Be very careful about this; if you specify the wrong number
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* of points, your program will either segfault or produce points at nonsensical coordinates.
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* The colour components are either doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* */
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void polygon(int* points, int number_of_points, double red, double green, double blue);
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void polygon(int* points, int number_of_points, int red, int green, int blue);
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/* Plot CMYK
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* Plot a point in the Cyan, Magenta, Yellow, Black colourspace. Please note that this colourspace is
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* lossy, i.e. it cannot reproduce all colours on screen that RGB can. The difference, however, is
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* barely noticeable. The algorithm used is a standard one. The colour components are either
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* doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* */
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void plotCMYK(int x, int y, double cyan, double magenta, double yellow, double black);
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void plotCMYK(int x, int y, int cyan, int magenta, int yellow, int black);
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/* Read CMYK, Double version
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* Get a pixel in the Cyan, Magenta, Yellow, Black colourspace. if 'colour' is 1, the Cyan component will be returned
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* as a double from 0.0 to 1.0. If 'colour is 2, the Magenta colour component will be returned, and so on, up to 4.
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* */
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double dreadCMYK(int x, int y, int colour);
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/* Read CMYK
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* Same as the above, but the colour components returned are an int from 0 to 65535.
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* */
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int readCMYK(int x, int y, int colour);
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/* Scale Proportional
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* Scale the image using bilinear interpolation. If k is greater than 1.0, the image will be enlarged.
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* If k is less than 1.0, the image will be shrunk. Negative or null values of k are not allowed.
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* The image will be resized and the previous content will be replaced by the scaled image.
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* Tip: use getheight() and getwidth() to find out the new width and height of the scaled image.
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* Note: After scaling, all images will have a bit depth of 16, even if the original image had
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* a bit depth of 8.
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* */
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void scale_k(double k);
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/* Scale Non-Proportional
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* Scale the image using bilinear interpolation, with different horizontal and vertical scale factors.
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* */
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void scale_kxky(double kx, double ky);
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/* Scale To Target Width and Height
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* Scale the image in such a way as to meet the target width and height.
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* Tip: if you want to keep the image proportional, scale_k() might be more appropriate.
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* */
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void scale_wh(int finalwidth, int finalheight);
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/* Blended Functions
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* All these functions are identical to their non-blended types. They take an extra argument, opacity, which is
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* a double from 0.0 to 1.0 and represents how much of the original pixel value is retained when plotting the
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* new pixel. In other words, if opacity is 0.7, then after plotting, the new pixel will be 30% of the
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* original colour the pixel was, and 70% of the new colour, whatever that may be. As usual, each function
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* is available in int or double versions. Please note: This is neither alpha channel nor PNG transparency chunk support. This merely blends the plotted pixels.
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* */
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// Start Blended Functions
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void plotHSV_blend(int x, int y, double opacity, double hue, double saturation, double value);
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void plotHSV_blend(int x, int y, double opacity, int hue, int saturation, int value);
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void line_blend(int xfrom, int yfrom, int xto, int yto, double opacity, int red, int green,int blue);
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void line_blend(int xfrom, int yfrom, int xto, int yto, double opacity, double red, double green,double blue);
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void square_blend(int xfrom, int yfrom, int xto, int yto, double opacity, int red, int green,int blue);
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void square_blend(int xfrom, int yfrom, int xto, int yto, double opacity, double red, double green,double blue);
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void filledsquare_blend(int xfrom, int yfrom, int xto, int yto, double opacity, int red, int green,int blue);
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void filledsquare_blend(int xfrom, int yfrom, int xto, int yto, double opacity, double red, double green,double blue);
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void circle_blend(int xcentre, int ycentre, int radius, double opacity, int red, int green, int blue);
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void circle_blend(int xcentre, int ycentre, int radius, double opacity, double red, double green, double blue);
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void filledcircle_blend(int xcentre, int ycentre, int radius, double opacity, int red, int green, int blue);
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void filledcircle_blend(int xcentre, int ycentre, int radius, double opacity, double red, double green, double blue);
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void bezier_blend(int startPtX, int startPtY,
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int startControlX, int startControlY,
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int endPtX, int endPtY,
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int endControlX, int endControlY,
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double opacity,
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double red, double green, double blue);
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void bezier_blend(int startPtX, int startPtY,
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int startControlX, int startControlY,
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int endPtX, int endPtY,
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int endControlX, int endControlY,
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double opacity,
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int red, int green, int blue);
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void plot_text_blend(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double opacity, double red, double green, double blue);
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void plot_text_blend(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double opacity, int red, int green, int blue);
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void plot_text_utf8_blend(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double opacity, double red, double green, double blue);
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void plot_text_utf8_blend(char* face_path, int fontsize, int x_start, int y_start, double angle, char* text, double opacity, int red, int green, int blue);
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void boundary_fill_blend(int xstart, int ystart, double opacity, double boundary_red,double boundary_green,double boundary_blue,double fill_red, double fill_green, double fill_blue) ;
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void boundary_fill_blend(int xstart, int ystart, double opacity, int boundary_red,int boundary_green,int boundary_blue,int fill_red, int fill_green, int fill_blue) ;
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void flood_fill_blend(int xstart, int ystart, double opacity, double fill_red, double fill_green, double fill_blue) ;
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void flood_fill_blend(int xstart, int ystart, double opacity, int fill_red, int fill_green, int fill_blue) ;
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void polygon_blend(int* points, int number_of_points, double opacity, double red, double green, double blue);
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void polygon_blend(int* points, int number_of_points, double opacity, int red, int green, int blue);
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void plotCMYK_blend(int x, int y, double opacity, double cyan, double magenta, double yellow, double black);
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void plotCMYK_blend(int x, int y, double opacity, int cyan, int magenta, int yellow, int black);
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// End of Blended Functions
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/* Laplacian
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* This function applies a discrete laplacian to the image, multiplied by a constant factor.
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* The kernel used in this case is:
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* 1.0 1.0 1.0
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* 1.0 -8.0 1.0
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* 1.0 1.0 1.0
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* Basically, this works as an edge detector. The current pixel is assigned the sum of all neighbouring
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* pixels, multiplied by the corresponding kernel element. For example, imagine a pixel and its 8 neighbours:
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* 1.0 1.0 0.0 0.0
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* 1.0 ->1.0<- 0.0 0.0
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* 1.0 1.0 0.0 0.0
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* This represents a border between white and black, black is on the right. Applying the laplacian to
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* the pixel specified above pixel gives:
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* 1.0*1.0 + 1.0*1.0 + 0.0*1.0 +
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* 1.0*1.0 + 1.0*-8.0 + 0.0*1.0 +
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* 1.0*1.0 + 1.0*1.0 + 0.0*1.0 = -3.0
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* Applying this to the pixel to the right of the pixel considered previously, we get a sum of 3.0.
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* That is, after passing over an edge, we get a high value for the pixel adjacent to the edge. Since
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* PNGwriter limits the colour components if they are off-scale, and the result of the laplacian
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* may be negative, a scale factor and an offset value are included. This might be useful for
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* keeping things within range or for bringing out more detail in the edge detection. The
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* final pixel value will be given by:
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* final value = laplacian(original pixel)*k + offset
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* Tip: Try a value of 1.0 for k to start with, and then experiment with other values.
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* */
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void laplacian(double k, double offset);
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/* Filled Triangle
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* Draws the triangle specified by the three pairs of points in the colour specified
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* by the colour coefficients. The colour components are either doubles from 0.0 to
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* 1.0 or ints from 0 to 65535.
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* */
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void filledtriangle(int x1,int y1,int x2,int y2,int x3,int y3, int red, int green, int blue);
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void filledtriangle(int x1,int y1,int x2,int y2,int x3,int y3, double red, double green, double blue);
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/* Filled Triangle, Blended
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* Draws the triangle specified by the three pairs of points in the colour specified
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* by the colour coefficients, and blended with the background. See the description for Blended Functions.
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* The colour components are either doubles from 0.0 to 1.0 or ints from 0 to 65535.
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* */
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void filledtriangle_blend(int x1,int y1,int x2,int y2,int x3,int y3, double opacity, int red, int green, int blue);
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void filledtriangle_blend(int x1,int y1,int x2,int y2,int x3,int y3, double opacity, double red, double green, double blue);
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/* Arrow, Filled Arrow
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* Plots an arrow from (x1, y1) to (x2, y2) with the arrowhead at the second point, given the size in pixels
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* and the angle in radians of the arrowhead. The plotted arrow consists of one main line, and two smaller
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* lines originating from the second point. Filled Arrow plots the same, but the arrowhead is a solid triangle.
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* Tip: An angle of 10 to 30 degrees looks OK.
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* */
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void arrow(int x1,int y1,int x2,int y2,int size, double head_angle, double red, double green, double blue);
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void arrow(int x1,int y1,int x2,int y2,int size, double head_angle, int red, int green, int blue);
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void filledarrow(int x1,int y1,int x2,int y2,int size, double head_angle, double red, double green, double blue);
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void filledarrow(int x1,int y1,int x2,int y2,int size, double head_angle, int red, int green, int blue);
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/* Cross, Maltese Cross
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* Plots a simple cross at x, y, with the specified height and width, and in the specified colour.
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* Maltese cross plots a cross, as before, but adds bars at the end of each arm of the cross.
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* The size of these bars is specified with x_bar_height and y_bar_width.
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* The cross will look something like this:
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*
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* ----- <-- ( y_bar_width)
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* |
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* |
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* |-------| <-- ( x_bar_height )
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* |
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* |
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* -----
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* */
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void cross(int x, int y, int xwidth, int yheight, double red, double green, double blue);
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void cross(int x, int y, int xwidth, int yheight, int red, int green, int blue);
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void maltesecross(int x, int y, int xwidth, int yheight, int x_bar_height, int y_bar_width, double red, double green, double blue);
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void maltesecross(int x, int y, int xwidth, int yheight, int x_bar_height, int y_bar_width, int red, int green, int blue);
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/* Diamond and filled diamond
|
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* Plots a diamond shape, given the x, y position, the width and height, and the colour.
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* Filled diamond plots a filled diamond.
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* */
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void filleddiamond(int x, int y, int width, int height, int red, int green, int blue);
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void diamond(int x, int y, int width, int height, int red, int green, int blue);
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void filleddiamond(int x, int y, int width, int height, double red, double green, double blue);
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void diamond(int x, int y, int width, int height, double red, double green, double blue);
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|
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/* Get Text Width, Get Text Width UTF8
|
|
* Returns the approximate width, in pixels, of the specified *unrotated* text. It is calculated by adding
|
|
* each letter's width and kerning value (as specified in the TTF file). Note that this will not
|
|
* give the position of the farthest pixel, but it will give a pretty good idea of what area the
|
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* text will occupy. Tip: The text, when plotted unrotated, will fit approximately in a box with its lower left corner at
|
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* (x_start, y_start) and upper right at (x_start + width, y_start + size), where width is given by get_text_width()
|
|
* and size is the specified size of the text to be plotted. Tip: Text plotted at position
|
|
* (x_start, y_start), rotated with a given 'angle', and of a given 'size'
|
|
* whose width is 'width', will fit approximately inside a rectangle whose corners are at
|
|
* 1 (x_start, y_start)
|
|
* 2 (x_start + width*cos(angle), y_start + width*sin(angle))
|
|
* 3 (x_start + width*cos(angle) - size*sin(angle), y_start + width*sin(angle) + size*cos(angle))
|
|
* 4 (x_start - size*sin(angle), y_start + size*cos(angle))
|
|
* */
|
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|
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int get_text_width(char* face_path, int fontsize, char* text);
|
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|
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int get_text_width_utf8(char* face_path, int fontsize, char* text);
|
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|
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};
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#endif
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