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/**
 * @file tft.h
 * @brief High level TFT functions
 * @author LoBo 04/2017
 * @see https://github.com/loboris
 */

#ifndef _TFT_H_
#define _TFT_H_

#include <stdlib.h>
#include "tftspi.h"

typedef struct {
	uint16_t        x1;
	uint16_t        y1;
	uint16_t        x2;
	uint16_t        y2;
} dispWin_t;

typedef struct {
	uint8_t 	*font;
	uint8_t 	x_size;
	uint8_t 	y_size;
	uint8_t		offset;
	uint16_t	numchars;
	uint16_t	size;
	uint8_t 	max_x_size;
	uint8_t		bitmap;
	color_t		color;
} Font;


//==========================================================================================
// ==== Global variables ===================================================================
//==========================================================================================
extern uint8_t   orientation;			///< current screen orientation
extern uint16_t  font_rotate;			///< current font font_rotate angle (0~395)
extern uint8_t   font_transparent;		///< if not 0 draw fonts transparent
extern uint8_t   font_forceFixed;		///< if not zero force drawing proportional fonts with fixed width
extern uint8_t   font_buffered_char;
extern uint8_t   font_line_space;		///< additional spacing between text lines; added to font height
extern uint8_t   text_wrap;			///< if not 0 wrap long text to the new line, else clip
extern color_t   _fg;				///< current foreground color for fonts
extern color_t   _bg;				///< current background for non transparent fonts
extern dispWin_t dispWin;			///< display clip window
extern float	  _angleOffset;			///< angle offset for arc, polygon and line by angle functions
extern uint8_t	  image_debug;			///< print debug messages during image decode if set to 1

extern Font cfont;				///< Current font structure

extern int	TFT_X;				///< X position of the next character after TFT_print() function
extern int	TFT_Y;				///< Y position of the next character after TFT_print() function

// =========================================================================================


// Buffer is created during jpeg decode for sending data
// Total size of the buffer is  2 * (JPG_IMAGE_LINE_BUF_SIZE * 3)
// The size must be multiple of 256 bytes !!
#define JPG_IMAGE_LINE_BUF_SIZE 512

// --- Constants for ellipse function ---
#define TFT_ELLIPSE_UPPER_RIGHT 0x01
#define TFT_ELLIPSE_UPPER_LEFT  0x02
#define TFT_ELLIPSE_LOWER_LEFT  0x04
#define TFT_ELLIPSE_LOWER_RIGHT 0x08

// Constants for Arc function
// number representing the maximum angle (e.g. if 100, then if you pass in start=0 and end=50, you get a half circle)
// this can be changed with setArcParams function at runtime
#define DEFAULT_ARC_ANGLE_MAX 360
// rotational offset in degrees defining position of value 0 (-90 will put it at the top of circle)
// this can be changed with setAngleOffset function at runtime
#define DEFAULT_ANGLE_OFFSET -90

#define PI 3.14159265359

#define MIN_POLIGON_SIDES	3
#define MAX_POLIGON_SIDES	60

// === Color names constants ===
extern const color_t TFT_BLACK;
extern const color_t TFT_NAVY;
extern const color_t TFT_DARKGREEN;
extern const color_t TFT_DARKCYAN;
extern const color_t TFT_MAROON;
extern const color_t TFT_PURPLE;
extern const color_t TFT_OLIVE;
extern const color_t TFT_LIGHTGREY;
extern const color_t TFT_DARKGREY;
extern const color_t TFT_BLUE;
extern const color_t TFT_GREEN;
extern const color_t TFT_CYAN;
extern const color_t TFT_RED;
extern const color_t TFT_MAGENTA;
extern const color_t TFT_YELLOW;
extern const color_t TFT_WHITE;
extern const color_t TFT_ORANGE;
extern const color_t TFT_GREENYELLOW;
extern const color_t TFT_PINK;

// === Color invert constants ===
#define INVERT_ON		1
#define INVERT_OFF		0

// === Special coordinates constants ===
#define CENTER	-9003
#define RIGHT	-9004
#define BOTTOM	-9004

#define LASTX	7000
#define LASTY	8000

// === Embedded fonts constants ===
#define DEFAULT_FONT		0	///< 12 points 95 characters DejaVu font.
#define DEJAVU18_FONT		1	///< 18 points 95 characters DejaVuSans font.
#define DEJAVU24_FONT		2	///< 24 points 95 characters DejaVu font.
#define UBUNTU16_FONT		3	///< 16 points 95 characters Ubuntu font.
#define COMIC24_FONT		4	///< 24 points 95 characters Comic font.
#define MINYA24_FONT		5	///< 24 points 95 characters Minya font.
#define TOONEY32_FONT		6	///< 32 points 95 characters Tooney font.
#define SMALL_FONT		7	///< 8x12 pixels 95 characters fixed font.
#define DEF_SMALL_FONT		8	///<  9 points 95 characters font.
#define FONT_7SEG		9	///< Variable size 14 characters 7 segment font.
#define USER_FONT		10	///< font will be read from file



// ===== PUBLIC FUNCTIONS =========================================================================


/**
 * @brief Draw pixel at given x,y coordinates
 * @param x horizontal position
 * @param y vertical position
 * @param color pixel color
 * @param sel if not 0 activate CS before and deactivat after sending pixel data to display
 *            when sending multiple pixels it is faster to activate the CS first,
 *            send all pixels an deactivate CS after all pixela was sent
 */
void TFT_drawPixel(int16_t x, int16_t y, color_t color, uint8_t sel);

/**
 * @brief Read pixel color value from display GRAM at given x,y coordinates
 * @param[in] x horizontal position
 * @param[in] y vertical position
 */
color_t TFT_readPixel(int16_t x, int16_t y);

/**
 * @brief Draw vertical line at given x,y coordinates
 * 
 * @param x horizontal start position
 * @param y vertical start position
 * @param h line height in pixels
 * @param color line color
 */
void TFT_drawFastVLine(int16_t x, int16_t y, int16_t h, color_t color);

/**
 * @brief Draw horizontal line at given x,y coordinates
 * 
 * @param x horizontal start position
 * @param y vertical start position
 * @param w line width in pixels
 * @param color line color
 */
void TFT_drawFastHLine(int16_t x, int16_t y, int16_t w, color_t color);

/**
 * @brief Draw line on screen
 * 
 * @param x0 horizontal start position
 * @param y0 vertical start position
 * @param x1 horizontal end position
 * @param y1 vertical end position
 * @param color line color
 */
void TFT_drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, color_t color);


/**
 * @brief Draw line on screen from (x,y) point at given angle
 *        Line drawing angle starts at lower right quadrant of the screen and is offseted by
 *        '_angleOffset' global variable (default: -90 degrees)
 *
 * @param x horizontal start position
 * @param y vertical start position
 * @param start start offset from (x,y)
 * @param len length of the line
 * @param angle line angle in degrees
 * @param color line color
 */
void TFT_drawLineByAngle(uint16_t x, uint16_t y, uint16_t start, uint16_t len, uint16_t angle, color_t color);

/**
 * @brief Fill given rectangular screen region with color
 * 
 * @param x horizontal rect start position
 * @param y vertical rect start position
 * @param w rectangle width
 * @param h rectangle height
 * @param color fill color
 */
void TFT_fillRect(int16_t x, int16_t y, int16_t w, int16_t h, color_t color);

/**
 * @brief Draw rectangle on screen
 * 
 * @param x horizontal rect start position
 * @param y vertical rect start position
 * @param w rectangle width
 * @param h rectangle height
 * @param color rect line color
 */
void TFT_drawRect(uint16_t x1,uint16_t y1,uint16_t w,uint16_t h, color_t color);

/**
 * @brief Draw rectangle with rounded corners on screen
 * 
 * @param x horizontal rect start position
 * @param y vertical rect start position
 * @param w rectangle width
 * @param h rectangle height
 * @param r corner radius
 * @param color rectangle color
 */
void TFT_drawRoundRect(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t r, color_t color);

/**
 * @brief Fill given rectangular screen region with rounded corners with color
 * 
 * @param x horizontal rect start position
 * @param y vertical rect start position
 * @param w rectangle width
 * @param h rectangle height
 * @param r corner radius
 * @param color fill color
 */
void TFT_fillRoundRect(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t r, color_t color);

/**
 * @brief Fill the whole screen with color
 * 
 * @param color fill color
 */
void TFT_fillScreen(color_t color);

/**
 * @brief Fill the current clip window with color
 *
 * @param color fill color
 */
void TFT_fillWindow(color_t color);

/**
 * @brief Draw triangle on screen
 * 
 * @param x0 first triangle point x position
 * @param y0 first triangle point y position
 * @param x0 second triangle point x position
 * @param y0 second triangle point y position
 * @param x0 third triangle point x position
 * @param y0 third triangle point y position
 * @param color triangle color
 */
void TFT_drawTriangle(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, color_t color);

/**
 * @brief Fill triangular screen region with color
 * 
 * @param x0 first triangle point x position
 * @param y0 first triangle point y position
 * @param x0 second triangle point x position
 * @param y0 second triangle point y position
 * @param x0 third triangle point x position
 * @param y0 third triangle point y position
 * @param color fill color
 */
void TFT_fillTriangle(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, color_t color);

/**
 * @brief Draw circle on screen
 * 
 * @param x circle center x position
 * @param y circle center x position
 * @param r circle radius
 * @param color circle color
 */
void TFT_drawCircle(int16_t x, int16_t y, int radius, color_t color);

/**
 * @brief Fill circle on screen with color
 * 
 * @param x circle center x position
 * @param y circle center x position
 * @param r circle radius
 * @param color circle fill color
 */
void TFT_fillCircle(int16_t x, int16_t y, int radius, color_t color);

/**
 * @brief Draw ellipse on screen
 * 
 * @param x0 ellipse center x position
 * @param y0 ellipse center x position
 * @param rx ellipse horizontal radius
 * @param ry ellipse vertical radius
 * @param option drawing options, multiple options can be combined
 *
 *               1 (TFT_ELLIPSE_UPPER_RIGHT) draw upper right corner
 *               2 (TFT_ELLIPSE_UPPER_LEFT)  draw upper left corner
 *               4 (TFT_ELLIPSE_LOWER_LEFT)  draw lower left corner
 *               8 (TFT_ELLIPSE_LOWER_RIGHT) draw lower right corner
 *             to draw the whole ellipse use option value 15 (1 | 2 | 4 | 8)
 * @param color: circle color
 */
void TFT_drawEllipse(uint16_t x0, uint16_t y0, uint16_t rx, uint16_t ry, color_t color, uint8_t option);

/**
 * @brief Fill elliptical region on screen
 * 
 * @param x0 ellipse center x position
 * @param y0 ellipse center x position
 * @param rx ellipse horizontal radius
 * @param ry ellipse vertical radius
 * @param option drawing options, multiple options can be combined
 *
 *              1 (TFT_ELLIPSE_UPPER_RIGHT) fill upper right corner
 *              2 (TFT_ELLIPSE_UPPER_LEFT)  fill upper left corner
 *              4 (TFT_ELLIPSE_LOWER_LEFT)  fill lower left corner
 *              8 (TFT_ELLIPSE_LOWER_RIGHT) fill lower right corner
 *            to fill the whole ellipse use option value 15 (1 | 2 | 4 | 8)
 * @param color fill color
 */
void TFT_fillEllipse(uint16_t x0, uint16_t y0, uint16_t rx, uint16_t ry, color_t color, uint8_t option);


/**
 * @brief Draw circle arc on screen
 *         Arc drawing angle starts at lower right quadrant of the screen and is offseted by
 *         '_angleOffset' global variable (default: -90 degrees)
 *
 * @param cx arc center X position
 * @param cy arc center Y position
 * @param th thickness of the drawn arc
 * @param ry arc vertical radius
 * @param start arc start angle in degrees
 * @param end arc end angle in degrees
 * @param color arc outline color
 * @param fillcolor arc fill color
 */
void TFT_drawArc(uint16_t cx, uint16_t cy, uint16_t r, uint16_t th, float start, float end, color_t color, color_t fillcolor);

/**
 * @brief Draw polygon on screen
 *
 * @param cx polygon center X position
 * @param cy arc center Y position
 * @param sides number of polygon sides; MAX_POLIGON_SIDES ~ MAX_POLIGON_SIDES (3 ~ 60)
 * @param diameter diameter of the circle inside which the polygon is drawn
 * @param color polygon outline color
 * @param fill polygon fill color; if same as color, polygon is not filled
 * @param deg polygon rotation angle; 0 ~ 360
 * @param th thickness of the polygon outline
 */
void TFT_drawPolygon(int cx, int cy, int sides, int diameter, color_t color, color_t fill, int deg, uint8_t th);

/**
 * @brief Set the font used for writing the text to display.
 *
 * ------------------------------------------------------------------------------------
 * For 7 segment font only characters 0,1,2,3,4,5,6,7,8,9, . , - , : , / are available.
 *   Character ‘/‘ draws the degree sign.
 * ------------------------------------------------------------------------------------
 *
 * @param font font number; use defined font names
 * @param font_file pointer to font file name; NULL for embeded fonts
 */
void TFT_setFont(uint8_t font, const char *font_file);

/**
 * @brief Returns current font height & width in pixels.
 *
 * @param[in] width pointer to returned font width
 * @param[in] height pointer to returned font height
 */
int TFT_getfontsize(int *width, int* height);

/**
 * @brief Returns current font height in pixels.
 * @return The font height in pixels.
 */
int TFT_getfontheight();

/**
 * @brief Write text to display.
 *
 * Rotation of the displayed text depends on 'font_rotate' variable (0~360)
 * if 'font_transparent' variable is set to 1, no background pixels will be printed
 *
 * If the text does not fit the screen width it will be clipped (if text_wrap=0),
 * or continued on next line (if text_wrap=1)
 *
 * Two special characters are allowed in strings:
 *
 * 		‘\r’ CR (0x0D), clears the display to EOL
 * 		‘\n’ LF (ox0A), continues to the new line, x=0
 *
 * @param st pointer to null terminated string to be printed
 * @param x horizontal position of the upper left point in pixels. Special values can be entered:
 *
 *		CENTER, centers the text
 *		RIGHT, right justifies the text
 *		LASTX, continues from last X position; offset can be used: LASTX+n
 *
 * @param y vertical position of the upper left point in pixels. Special values can be entered:
 *
 *		CENTER, centers the text
 *		BOTTOM, bottom justifies the text
 *		LASTY, continues from last Y position; offset can be used: LASTY+n
 *
 */
void TFT_print(char *st, int x, int y);

/**
 * @brief Set atributes for 7 segment vector font
 * @note 7 segment font must be the current font to this function to have effect
 *
 * @param l 6~40; distance between bars in pixels
 * @param w 1~12, max l/2;  bar width in pixels
 * @param outline draw font outline if set to 1
 * @param color	font outline color, only used if outline=1
 */
void set_7seg_font_atrib(uint8_t l, uint8_t w, int outline, color_t color);

/**
 * @brief Sets the clipping area coordinates.
 *        All writing to screen is clipped to that area.
 *        Starting x & y in all functions will be adjusted to the clipping area.
 *
 * @param x1,y1	upper left point of the clipping area
 * @param x2,y2	bottom right point of the clipping area
 */
void TFT_setclipwin(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2);

/**
 * @brief Resets the clipping area to full screen (0,0),(_wodth,_height)
 */
void TFT_resetclipwin();

/**
 * @brief Save current clipping area to temporary variable
 */
void TFT_saveClipWin();

/**
 * @brief Restore current clipping area from temporary variable
 */
void TFT_restoreClipWin();

/**
 * @brief Set the screen rotation
 *        Also resets the clip window and clears the screen with current background color
 *
 * @param rot 0~3; screen rotation; use defined rotation constants:
 * 	      PORTRAIT, LANDSCAPE, PORTRAIT_FLIP, LANDSCAPE_FLIP
 */
void TFT_setRotation(uint8_t rot);

/**
 * @brief Set inverted/normal colors
 *
 * @param mode 0 or 1; use defined constants: INVERT_ON or INVERT_OFF
 */
void TFT_invertDisplay(const uint8_t mode);

/**
 * @brief Select gamma curve
 * @param gm gama curve, values 0~3
 */
void TFT_setGammaCurve(uint8_t gm);

/**
 * @brief Compare two color structures
 * @return 0 if equal, 1 if not equal
 *
 * @param c1, c2 colors to be compared
 */
int TFT_compare_colors(color_t c1, color_t c2);

/**
 * @brief returns the string width in pixels. Useful for positions strings on the screen.
 * @return The string width.
 */
int TFT_getStringWidth(char* str);


/**
 * @brief Fills the rectangle occupied by string with current background color
 * @param x X position
 * @param Y Y position
 * @param str The string
 */
void TFT_clearStringRect(int x, int y, char *str);

/**
 * @brief Converts the components of a color, as specified by the HSB model,
 *        to an equivalent set of values for the default RGB model.
 *
 *        The color structure that is returned by HSBtoRGB encodes the value of a color as R, G & B component
 *
 * @param _hue any number, the floor of this number is subtracted from it to create a fraction between 0 and 1.
 * 	       This fractional number is then multiplied by 360 to produce the hue angle in the HSB color model.
 * @param _sat 0 ~ 1.0
 * @param _brightness 0 ~ 1.0
 */
color_t HSBtoRGB(float _hue, float _sat, float _brightness);

/**
 * @brief Decodes and displays JPG image
 *        Limits:
 * 		Baseline only. Progressive and Lossless JPEG format are not supported.
 *		Image size: Up to 65520 x 65520 pixels
 *		Color space: YCbCr three components only. Gray scale image is not supported.
 *		Sampling factor: 4:4:4, 4:2:2 or 4:2:0.
 *
 * @param x image left position; constants CENTER & RIGHT can be used; negative value is accepted
 * @param y image top position;  constants CENTER & BOTTOM can be used; negative value is accepted
 * @param scale image scale factor: 0~3; if scale>0, image is scaled by factor 1/(2^scale) (1/2, 1/4 or 1/8)
 * @param fname pointer to the name of the file from which the image will be read
 *   		if set to NULL, image will be read from memory buffer pointed to by 'buf'
 * @param buf pointer to the memory buffer from which the image will be read; used if fname=NULL
 * @param size size of the memory buffer from which the image will be read; used if fname=NULL & buf!=NULL
 */
void TFT_jpg_image(int x, int y, uint8_t scale, char *fname, uint8_t *buf, int size);

/**
 * @brief Decodes and displays BMP image
 *        Only uncompressed RGB 24-bit with no color space information BMP images can be displayed
 *
 * @param x image left position; constants CENTER & RIGHT can be used; negative value is accepted
 * @param y image top position;  constants CENTER & BOTTOM can be used; negative value is accepted
 * @param scale image scale factor: 0~7; if scale>0, image is scaled by factor 1/(scale+1)
 * @param fname pointer to the name of the file from which the image will be read
 *   		if set to NULL, image will be read from memory buffer pointed to by 'imgbuf'
 * @param imgbuf pointer to the memory buffer from which the image will be read; used if fname=NULL
 * @param size size of the memory buffer from which the image will be read; used if fname=NULL & imgbuf!=NULL
 */
int TFT_bmp_image(int x, int y, uint8_t scale, char *fname, uint8_t *imgbuf, int size);

/**
 * @brief Get the touch panel coordinates.
 *        The coordinates are adjusted to screen orientation if raw=0
 *
 * @param[in] x pointer to X coordinate
 * @param[in] y pointer to Y coordinate
 * @param raw if 0 returns calibrated screen coordinates; if 1 returns raw touch controller coordinates
 * @return 0 if touch panel is not touched; x=y=0
 *         1 if touch panel is touched; x&y are the valid coordinates
 */
int TFT_read_touch(int *x, int* y, uint8_t raw);


/**
 * @brief Compile font c source file to .fnt file
 *        which can be used in TFT_setFont() function to select external font
 *        Created file have the same name as source file and extension .fnt
 *
 * @param fontfile pointer to c source font file name; must have .c extension
 * @param dbg if set to 1, prints debug information
 *
 * @return 0 on success, err no on error
 */
int compile_font_file(char *fontfile, uint8_t dbg);

/**
 * @brief Get all font's characters to buffer
 */
void getFontCharacters(uint8_t *buf);

#endif