Description

Silicon Labs Graphics Library.

Graphics Library

Silicon Labs Graphics Library. Feature rich graphics library for memory constrained applications.

Introduction

GLIB is a graphics library that can be used to draw pixels, common shapes, text or bitmaps to a display connected to an MCU. The main goal of this library is easy of use and small code and memory footprint. In this way GLIB can be used on even the smallest Cortex-M0 devices.

GLIB treats the display as a matrix of pixels which is a model of the physical display. This matrix is exposed to GLIB via an API called DMD (Dot Matrix Display). So in order to draw something on a physical display the user application needs to provide GLIB with a single implementation of the DMD interface. Sample DMD implementations are provided for the displays that are connected to the Silion Labs Starter Kits and the Silicon Labs Development Kits.

Initialization

There are two things that must be initialized before GLIB can be used to draw pixels on the display. First the user needs to initialize the DMD implementation for the actual hardware display which is used. This initialization is display hardware specific.

After the DMD is initialized the user needs to initialize a GLIB_Context_t that can be used for all the drawing operations. A GLIB_Context_t structure is initialized using the GLIB_contextInit() function.

Every GLIB drawing function will require a GLIB_Context_t as one of the functions arguments. The GBLI context contains important configuration values that all the drawing functions use. It contains the foreground and background color, and it also contains information on what font to use when rendering text on the display.

Color

GLIB represent color in a pixel as three 8 bit color values representing red, green and blue, giving the user support for a 24 bit color depth. The GLIB_rgbColor() function can be used to convert from distinct red, green and blue values to an 32-bit integer representing the color of single pixel. Similarly the GLIB_colorTranslate24bpp() function can be used to convert from the 32-bit integer representation into the 3 separate red, green and blue components. The 32-bit integer representation of a pixel color is used when configuring the foreground and background color.

GLIB also contains some common predefined colors for use in places where a 32-bit integer is used to represent the color. These predefined colors include White , Black , Brown , Orange , and many more. See the GLIB Colors for the full list of colors.

Some displays are monochrome, meaning that they only support 2 colors. When using GLIB to draw shapes on these displays the applications should use only the 2 colors White and Black .

Draw Shapes

GLIB contains functions for drawing common shapes to a display. Here is a list containing all the drawing functions.

GLIB_drawCircle() . Draw a circle outline with the foreground color.
GLIB_drawCircleFilled() . Draw a circle filled with the foreground color.
GLIB_drawPartialCircle() . Draw specific octants of a circle with the foreground color.
GLIB_drawLine() . Draw line with the foreground color.
GLIB_drawLineH() . Draw a horizontal line.
GLIB_drawLineV() . Draw a vertical line.
GLIB_drawRect() . Draw a rectangle outline with the foreground color.
GLIB_drawRectFilled() . Draw a filled rectangle using the foreground color.
GLIB_drawPolygon() . Draw lines between all the points in the given set using the foreground color.
GLIB_drawPolygonFilled() . Draw filled polygon between points.

Draw Pixels

These are functions that GLIB provides for drawing one pixel.

GLIB_drawPixel() . Draw a pixel using the foreground color.
GLIB_drawPixelRGB() . Draw a single pixel using a specific color.
GLIB_drawPixelColor() . Draw a single pixel using a specific color.

Font rendering

GLIB Supports fixed width font rendering. The functions GLIB_drawString() and GLIB_drawChar() are used to render text on the display.

GLIB provides these fonts for the user

GLIB_FontNormal8x8 A normal 8x8 pixel font which is the defaul font if nothing else is configured.
GLIB_FontNarrow6x8 A narrow 6x8 pixel font which can be used if the default font is to wide.
GLIB_FontNumber16x20 A large font for use with only numbers. This font is 16x20 pixels.

To change the font the user calls GLIB_setFont() with a pointer to a GLIB_Font_t structure which describes the whole font. The GLIB_Font_t structure contains a pointer to the bitmap for each character and it describes attributes of the font like the width and height of each character and it also contains the bitmap of each character.

Draw Bitmap

To draw an image or custom bitmaps on the display the GLIB_drawBitmap() function can be used. The color displays typically use a bitmap format where each pixel is represented by 3 consecutive bytes representing the red, green and blue color components. While monochrome displays typically use a bitmap format where 1 byte represents 8 pixels where a 1 bit is white and a 0 bit is black. Note that bitmaps are insensitive to the foreground and background color settings, and that the format of the bitmap depends on the DMD implementation of the display.

Example

This examples shows how to initialize a GLIB context and draw something on a display.

       
        static
       
       GLIB_Context_t context;
      
        static
       
        const
       
        char
       
       * msg =
       
        "Hello GLIB!"
       
       ;
      
        void
       
       setupGlib(
       
        void
       
       )
      
       {
      
        DMD_init
       
       (0);
      
        GLIB_contextInit
       
       (&context);
      
        GLIB_drawString
       
       (&context, msg, strlen(msg), 10, 10,
       
        true
       
       );
      
       }

Modules
DMD - Dot Matrix Display
Hardware abstraction layer for dot matrix displays.

GLIB BMP
Bitmap Support.

GLIB Colors
Predefined Colors.

Data Structures
struct	__GLIB_Font_t
	Font definition structure.

struct	__GLIB_Rectangle_t
	Rectangle structure.

struct	__GLIB_Context_t
	GLIB Drawing Context (Multiple instances of GLIB_Context_t can exist)

Functions
EMSTATUS	GLIB_contextInit (GLIB_Context_t *pContext)
	Initialize the GLIB_Context_t.

EMSTATUS	GLIB_displayWakeUp (void)
	Returns the display from sleep mode.

EMSTATUS	GLIB_displaySleep (void)
	Sets the display in sleep mode.

EMSTATUS	GLIB_clear (GLIB_Context_t *pContext)
	Clears the display with the background color of the GLIB_Context_t.

EMSTATUS	GLIB_clearRegion (const GLIB_Context_t *pContext)
	Clears the clipping region by filling it with the background color of the GLIB_Context_t.

EMSTATUS	GLIB_resetDisplayClippingArea (GLIB_Context_t *pContext)
	Reset the display driver clipping area to the whole display.

EMSTATUS	GLIB_resetClippingRegion (GLIB_Context_t *pContext)
	Reset the GLIB_Context_t clipping region to the whole display.

EMSTATUS	GLIB_applyClippingRegion (const GLIB_Context_t *pContext)
	Apply the clipping region from the GLIB_Context_t in the DMD driver.

void	GLIB_colorTranslate24bpp (uint32_t color, uint8_t red, uint8_t green, uint8_t *blue)
	Extracts the color components from the 32-bit color passed and puts them in the passed in 8-bits ints.

uint32_t	GLIB_rgbColor (uint8_t red, uint8_t green, uint8_t blue)
	Convert 3 uint8_t color components into a 24-bit color.

bool	GLIB_rectContainsPoint (const GLIB_Rectangle_t *pRect, int32_t xCenter, int32_t yCenter)
	Checks if the point passed in is in the interior of the rectangle passed in.

void	GLIB_normalizeRect (GLIB_Rectangle_t *pRect)
	Normalize the rectangle that is passed in.

EMSTATUS	GLIB_setClippingRegion (GLIB_Context_t pContext, const GLIB_Rectangle_t pRect)
	Sets the clippingRegion of the passed in GLIB_Context_t.

EMSTATUS	GLIB_drawCircle (GLIB_Context_t *pContext, int32_t x, int32_t y, uint32_t radius)
	Draws a circle with center at x, y, and a radius.

EMSTATUS	GLIB_drawCircleFilled (GLIB_Context_t *pContext, int32_t x, int32_t y, uint32_t radius)
	Draws a filled circle with center at x, y, and a radius.

EMSTATUS	GLIB_drawPartialCircle (GLIB_Context_t *pContext, int32_t xCenter, int32_t yCenter, uint32_t radius, uint8_t bitMask)
	Draws a partial circle with center at x, y, and a radius.

EMSTATUS	GLIB_setFont (GLIB_Context_t pContext, GLIB_Font_t pFont)
	Set new font for the library.

EMSTATUS	GLIB_drawString (GLIB_Context_t pContext, const char pString, uint32_t sLength, int32_t x0, int32_t y0, bool opaque)
	Draws a string using the font supplied with the library.

EMSTATUS	GLIB_drawStringOnLine (GLIB_Context_t pContext, const char pString, uint8_t line, GLIB_Align_t align, int32_t xOffset, int32_t yOffset, bool opaque)
	Draws a string on the specified line on the display.

EMSTATUS	GLIB_drawChar (GLIB_Context_t *pContext, char myChar, int32_t x, int32_t y, bool opaque)
	Draws a char using the font supplied with the library.

EMSTATUS	GLIB_drawBitmap (GLIB_Context_t pContext, int32_t x, int32_t y, uint32_t width, uint32_t height, const uint8_t picData)
	Draws a bitmap.

void	GLIB_invertBitmap (GLIB_Context_t pContext, uint32_t bitmapSize, uint8_t picData)
	Inverts each bit of the bitmap.

EMSTATUS	GLIB_drawLine (GLIB_Context_t *pContext, int32_t x1, int32_t y1, int32_t x2, int32_t y2)
	Draws a line from x1,y1 to x2, y2.

EMSTATUS	GLIB_drawLineH (GLIB_Context_t *pContext, int32_t x1, int32_t y1, int32_t x2)
	Draws a horizontal line from x1, y1 to x2, y2.

EMSTATUS	GLIB_drawLineV (GLIB_Context_t *pContext, int32_t x1, int32_t y1, int32_t y2)
	Draws a vertical line from x1, y1 to x1, y2.

EMSTATUS	GLIB_drawRect (GLIB_Context_t pContext, const GLIB_Rectangle_t pRect)
	Draws a rectangle outline defined by the passed in rectangle.

EMSTATUS	GLIB_drawRectFilled (GLIB_Context_t pContext, const GLIB_Rectangle_t pRect)
	Draws a filled rectangle defined by the passed in rectangle.

EMSTATUS	GLIB_drawPolygon (GLIB_Context_t pContext, uint32_t numPoints, const int32_t polyPoints)
	Draws a polygon using Bresnham's Midpoint Line Algorithm.

EMSTATUS	GLIB_drawPolygonFilled (GLIB_Context_t pContext, uint32_t numPoints, const int32_t polyPoints)
	Draws a filled polygon using a scan line algorithm.

EMSTATUS	GLIB_drawPixelRGB (GLIB_Context_t *pContext, int32_t x, int32_t y, uint8_t red, uint8_t green, uint8_t blue)
	Draws a pixel at x, y with color defined by red, green and blue 1 byte per channel.

EMSTATUS	GLIB_drawPixel (GLIB_Context_t *pContext, int32_t x, int32_t y)
	Draws a pixel at x, y using foregroundColor defined in the GLIB_Context_t.

EMSTATUS	GLIB_drawPixelColor (GLIB_Context_t *pContext, int32_t x, int32_t y, uint32_t color)
	Draws a pixel at x, y using the color parameter.

Macros
#define	ECODE_GLIB_BASE 0x00000000
	GLIB Base error code.

#define	GLIB_OK 0x00000000
	Successful call.

#define	GLIB_ERROR_NOTHING_TO_DRAW ( ECODE_GLIB_BASE \| 0x0001)
	Function did not draw.

#define	GLIB_ERROR_INVALID_CHAR ( ECODE_GLIB_BASE \| 0x0002)
	Invalid char.

#define	GLIB_OUT_OF_BOUNDS ( ECODE_GLIB_BASE \| 0x0003)
	Coordinates out of bounds.

#define	GLIB_ERROR_INVALID_CLIPPINGREGION ( ECODE_GLIB_BASE \| 0x0004)
	Invalid coordinates (ex.

#define	GLIB_ERROR_INVALID_ARGUMENT ( ECODE_GLIB_BASE \| 0x0005)
	Invalid argument.

#define	GLIB_ERROR_OUT_OF_MEMORY ( ECODE_GLIB_BASE \| 0x0006)
	Out of memory.

#define	GLIB_ERROR_FILE_NOT_SUPPORTED ( ECODE_GLIB_BASE \| 0x0007)
	File not supported.

#define	GLIB_ERROR_IO ( ECODE_GLIB_BASE \| 0x0008)
	General IO Error.

#define	GLIB_ERROR_INVALID_FILE ( ECODE_GLIB_BASE \| 0x0009)
	Invalid file.

Enumerations
enum	__GLIB_Font_Class { InvalidFont = 0, FullFont , NumbersOnlyFont }
	Font classes.

enum	__GLIB_Align { GLIB_ALIGN_LEFT , GLIB_ALIGN_CENTER , GLIB_ALIGN_RIGHT }
	Alignment types.

Variables
const GLIB_Font_t	GLIB_FontNormal8x8
	Normal 8x8 pixels font containing characters and numbers.

const GLIB_Font_t	GLIB_FontNarrow6x8
	Narrow 6x8 pixels font containing characters and numbers.

const GLIB_Font_t	GLIB_FontNumber16x20
	Large 16x20 pixels font containing only numbers.

Function Documentation

◆ GLIB_contextInit()

EMSTATUS GLIB_contextInit ( GLIB_Context_t * pContext )

Initialize the GLIB_Context_t.

The context is set to default values and gets information about the display from the display driver.

Parameters

pContext Pointer to a GLIB_Context_t

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_displayWakeUp()

EMSTATUS GLIB_displayWakeUp ( )

Returns the display from sleep mode.

Returns: Returns DMD_OK on success, or else error code

◆ GLIB_displaySleep()

EMSTATUS GLIB_displaySleep ( )

Sets the display in sleep mode.

Returns: Returns DMD_OK on success, or else error code

◆ GLIB_clear()

EMSTATUS GLIB_clear ( GLIB_Context_t * pContext )

Clears the display with the background color of the GLIB_Context_t.

Parameters

pContext Pointer to a GLIB_Context_t which holds the background color.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_clearRegion()

EMSTATUS GLIB_clearRegion ( const GLIB_Context_t * pContext )

Clears the clipping region by filling it with the background color of the GLIB_Context_t.

Parameters

pContext Pointer to a GLIB_Context_t which holds the background color.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_resetDisplayClippingArea()

EMSTATUS GLIB_resetDisplayClippingArea ( GLIB_Context_t * pContext )

Reset the display driver clipping area to the whole display.

Parameters

pContext Pointer to a GLIB_Context_t

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_resetClippingRegion()

EMSTATUS GLIB_resetClippingRegion ( GLIB_Context_t * pContext )

Reset the GLIB_Context_t clipping region to the whole display.

Parameters

pContext Pointer to a GLIB_Context_t

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_applyClippingRegion()

EMSTATUS GLIB_applyClippingRegion ( const GLIB_Context_t * pContext )

Apply the clipping region from the GLIB_Context_t in the DMD driver.

Parameters

pContext Pointer to a GLIB_Context_t

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_colorTranslate24bpp()

void GLIB_colorTranslate24bpp	(	uint32_t	`color,`
		uint8_t *	`red,`
		uint8_t *	`green,`
		uint8_t *	`blue`
	)

Extracts the color components from the 32-bit color passed and puts them in the passed in 8-bits ints.

The color is 24-bit RGB.

Example: color = 0x00FFFF00 -> red = 0xFF, green = 0xFF, blue = 0x00.

Parameters

`color`	The color which is to be translated
`red`	Pointer to a uint8_t holding the red component
`green`	Pointer to a uint8_t holding the green component
`blue`	Pointer to a uint8_t holding the blue component

◆ GLIB_rgbColor()

uint32_t GLIB_rgbColor	(	uint8_t	`red,`
		uint8_t	`green,`
		uint8_t	`blue`
	)

Convert 3 uint8_t color components into a 24-bit color.

Example: red = 0xFF, green = 0xFF, blue = 0x00 -> 0x00FFFF00 = Yellow

Parameters

`red`	Red component
`green`	Green component
`blue`	Blue component

Returns: Returns a 32-bit unsigned integer representing the color. The 8 LSB is blue, the next 8 is green and the next 8 is red. 0x00RRGGBB

◆ GLIB_rectContainsPoint()

bool GLIB_rectContainsPoint	(	const GLIB_Rectangle_t *	`pRect,`
		int32_t	`x,`
		int32_t	`y`
	)

Checks if the point passed in is in the interior of the rectangle passed in.

If the point is on the edge of the rectangle the function returns 1.

Parameters

`pRect`	Pointer to a rectangle structure
`x`	X-coordinate of point
`y`	Y-coordinate of point

Returns

Returns false if coordinate is outside the rectangle
Returns true otherwise

◆ GLIB_normalizeRect()

void GLIB_normalizeRect ( GLIB_Rectangle_t * pRect )

Normalize the rectangle that is passed in.

Sets yMin to the minimum value of yMin and yMax. Sets yMax to the maximum value of yMin and yMax. And the same for xMin and xMax

Parameters

pRect Pointer to a rectangle structure

◆ GLIB_setClippingRegion()

EMSTATUS GLIB_setClippingRegion	(	GLIB_Context_t *	`pContext,`
		const GLIB_Rectangle_t *	`pRect`
	)

Sets the clippingRegion of the passed in GLIB_Context_t.

Parameters

`pContext`	Pointer to a GLIB_Context_t
`pRect`	Pointer to a GLIB_Rectangle_t which is the clipping region to be set.

Returns

Returns GLIB_OK on success
Returns GLIB_ERROR_INVALID_CLIPPINGREGION if invalid coordinates
Returns GLIB_OUT_OF_BOUNDS if clipping region is bigger than display clipping area

◆ GLIB_drawCircle()

EMSTATUS GLIB_drawCircle	(	GLIB_Context_t *	`pContext,`
		int32_t	`xCenter,`
		int32_t	`yCenter,`
		uint32_t	`radius`
	)

Draws a circle with center at x, y, and a radius.

Draws a circle using the Midpoint Circle Algorithm. See Wikipedia for algorithm. Algorithm is optimized to use only integer arithmetic, so no floating point arithmetic is needed.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the circle is drawn. The circle is drawn using the foreground color.
`xCenter`	Center x-coordinate
`yCenter`	Center y-coordinate
`radius`	Radius of the circle

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawCircleFilled()

EMSTATUS GLIB_drawCircleFilled	(	GLIB_Context_t *	`pContext,`
		int32_t	`xCenter,`
		int32_t	`yCenter,`
		uint32_t	`radius`
	)

Draws a filled circle with center at x, y, and a radius.

Draws a circle using the Midpoint Circle Algorithm and using horizontal lines. See Wikipedia for algorithm.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the circle is drawn. The circle is drawn using the foreground color.
`xCenter`	Center x-coordinate
`yCenter`	Center y-coordinate
`radius`	Radius of the circle

Returns: Returns GLIB_OK on succes. Returns GLIB_ERROR_NOTHING_TO_DRAW if none of the pixel coordinates were inside the clipping region. Returns error code otherwise.

◆ GLIB_drawPartialCircle()

EMSTATUS GLIB_drawPartialCircle	(	GLIB_Context_t *	`pContext,`
		int32_t	`xCenter,`
		int32_t	`yCenter,`
		uint32_t	`radius,`
		uint8_t	`bitMask`
	)

Draws a partial circle with center at x, y, and a radius.

Draws a partial circle using the Midpoint Circle Algorithm. Algorithm is optimized to use only integer arithmetic, so no floating point arithmetic is needed. The bitMask passed in decides which octant that should be drawn. The octants is numbered 1 to 8 in counterclockwise order.

Example: bitMask == 4 draws only pixels in 3. octant (00000100). bitMask == 5 draws only pixels in 3. and 1. octant (00000101).

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the circle is drawn. The circle is drawn using the foreground color.
`xCenter`	Center x-coordinate
`yCenter`	Center y-coordinate
`radius`	Radius of the circle
`bitMask`	Bitmask which decides which octants pixels should be drawn. The LSB is 1. octant, and the MSB is 8. octant.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_setFont()

EMSTATUS GLIB_setFont	(	GLIB_Context_t *	`pContext,`
		GLIB_Font_t *	`pFont`
	)

Set new font for the library.

Note that GLIB defines a default font in glib.c. Redefine GLIB_DEFAULT_FONT to change the default font.

Parameters

`pContext`	Pointer to the GLIB_Context_t
`pFont`	Pointer to the new font

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawString()

EMSTATUS GLIB_drawString	(	GLIB_Context_t *	`pContext,`
		const char *	`pString,`
		uint32_t	`sLength,`
		int32_t	`x0,`
		int32_t	`y0,`
		bool	`opaque`
	)

Draws a string using the font supplied with the library.

Parameters

`pContext`	Pointer to a GLIB_Context_t
`pString`	Pointer to the string that is drawn
`sLength`	number of characters in the string
`x0`	Start x-coordinate for the string (Upper left corner)
`y0`	Start y-coordinate for the string (Upper left corner)
`opaque`	Determines whether to show the background or color it with the background color specified by the GLIB_Context_t. If opaque == 1, the background color is used.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawStringOnLine()

EMSTATUS GLIB_drawStringOnLine	(	GLIB_Context_t *	`pContext,`
		const char *	`pString,`
		uint8_t	`line,`
		GLIB_Align_t	`align,`
		int32_t	`xOffset,`
		int32_t	`yOffset,`
		bool	`opaque`
	)

Draws a string on the specified line on the display.

Parameters

`pContext`	Pointer to a GLIB_Context_t
`pString`	Pointer to the string that is drawn
`line`	Specifies which line on the display to draw on.
`align`	Horizontal alignment of the string on the line. This can be left, right or center. Note that left alignment is default.
`xOffset`	This parameter can be used to create a margin on the left or right side of the string. Note that this argument accepts a negative value which can be useful when aligning the string to the right.
`yOffset`	This parameter can be used to move the string further down or up a certain number of pixels. A positive value would move the string down, while a negative value would move the string up.
`opaque`	Determines whether to show the background or color it with the background color specified by the GLIB_Context_t. If opaque == 1, the background color is used.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawChar()

EMSTATUS GLIB_drawChar	(	GLIB_Context_t *	`pContext,`
		char	`myChar,`
		int32_t	`x,`
		int32_t	`y,`
		bool	`opaque`
	)

Draws a char using the font supplied with the library.

Parameters

`pContext`	Pointer to the GLIB_Context_t
`myChar`	Char to be drawn
`x`	Start x-coordinate for the char (Upper left corner)
`y`	Start y-coordinate for the char (Upper left corner)
`opaque`	Determines whether to show the background or color it with the background color specified by the GLIB_Context_t. If opaque == true, the background color is used.

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawBitmap()

EMSTATUS GLIB_drawBitmap	(	GLIB_Context_t *	`pContext,`
		int32_t	`x,`
		int32_t	`y,`
		uint32_t	`width,`
		uint32_t	`height,`
		const uint8_t *	`picData`
	)

Draws a bitmap.

Sets up a bitmap that starts at x0,y0 and draws bitmap.

For monochrome displays, each 8-bit element contains 8 pixel values. A bit value of 1 indicates a white pixel, while 0 indicates a black pixel. Note that this format may vary with the DMD implementation.

For 3-bit RGB displays, each bit in the array are one color component (red, green and blue) of the pixel, so that 3 bits represent one pixel (0xBGR). Pixel 0: Bits 2:0 (0bBGR) of byte 0 Pixel 1: Bits 5:3 (0bBGR) of byte 0 Pixel 2: Bits 7:6 (0bGR) of byte 0 and bit 0 (0bB) of byte 1 Pixel 3: Bits 3:1 (0bBGR) of byte 1 ...

For RGB displays with 8-bits per color, each pixel is represented by 24-bits, with one byte for each of the red, green and blue components. The data has to be organized like this: picData = { R, G, B, R, G, B, R, G, B ... }

The pixels are ordered by increasing x coordinate, after the last pixel of a row, the next pixel will be the first pixel on the next row.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the bitmap is drawn.
`x`	Start x-coordinate for bitmap
`y`	Start y-coordinate for bitmap
`width`	Width of picture
`height`	Height of picture
`picData`	Bitmap data

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_invertBitmap()

void GLIB_invertBitmap	(	GLIB_Context_t *	`pContext,`
		uint32_t	`bitmapSize,`
		uint8_t *	`picData`
	)

Inverts each bit of the bitmap.

For monochrome displays, the result is an inversion of the image.

For RGB displays, the result is the negative of the input image.

Note: The function inverts entire bytes, meaning that any bits contained within the array that may not be part of the image will also be inverted.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the bitmap is drawn.
`bitmapSize`	Size of the bitmap array in terms of bytes.
`picData`	Bitmap data.

◆ GLIB_drawLine()

EMSTATUS GLIB_drawLine	(	GLIB_Context_t *	`pContext,`
		int32_t	`x1,`
		int32_t	`y1,`
		int32_t	`x2,`
		int32_t	`y2`
	)

Draws a line from x1,y1 to x2, y2.

Draws a straight line using the Bresnham's Midpoint Line Algorithm. Checks for vertical and horizontal line.

Parameters

`pContext`	Pointer to the GLIB_Context_t which holds the clipping region
`x1`	Start x-coordinate
`y1`	Start y-coordinate
`x2`	End x-coordinate
`y2`	End y-coordinate

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawLineH()

EMSTATUS GLIB_drawLineH	(	GLIB_Context_t *	`pContext,`
		int32_t	`x1,`
		int32_t	`y1,`
		int32_t	`x2`
	)

Draws a horizontal line from x1, y1 to x2, y2.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the line is drawn. The line is drawn using the foreground color.
`x1`	Start x-coordinate
`y1`	Start y-coordinate
`x2`	End x-coordinate

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawLineV()

EMSTATUS GLIB_drawLineV	(	GLIB_Context_t *	`pContext,`
		int32_t	`x1,`
		int32_t	`y1,`
		int32_t	`y2`
	)

Draws a vertical line from x1, y1 to x1, y2.

Parameters

`pContext`	Pointer to a GLIB_Context_t which the line is drawn. The line is drawn using the foreground color.
`x1`	Start x-coordinate
`y1`	Start y-coordinate
`y2`	End y-coordinate

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawRect()

EMSTATUS GLIB_drawRect	(	GLIB_Context_t *	`pContext,`
		const GLIB_Rectangle_t *	`pRect`
	)

Draws a rectangle outline defined by the passed in rectangle.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the rectangle is drawn. The rectangle is drawn using the foreground color.
`pRect`	Pointer to a rectangle structure

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawRectFilled()

EMSTATUS GLIB_drawRectFilled	(	GLIB_Context_t *	`pContext,`
		const GLIB_Rectangle_t *	`pRect`
	)

Draws a filled rectangle defined by the passed in rectangle.

The filled rectangle is drawn from (xMin, yMin) to (xMax, yMax), inclusive, of the rectangle passed in.

Parameters

`pContext`	Pointer to a GLIB_Context_t in which the rectangle is drawn. The rectangle is filled with the foreground color.
`pRect`	Pointer to a rectangle structure

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawPolygon()

EMSTATUS GLIB_drawPolygon	(	GLIB_Context_t *	`pContext,`
		uint32_t	`numPoints,`
		const int32_t *	`polyPoints`
	)

Draws a polygon using Bresnham's Midpoint Line Algorithm.

This function draws a line between all points outlining the polygon. The first and last point doesn't have to be the same. The function automatically draws a line from the start point to the end point.

Parameters

`pContext`	Pointer to a GLIB_Context_t which the line is drawn. The lines are drawn using the foreground color.
`numPoints`	Number of points in the polygon ( Has to be greater than 1 )
`polyPoints`	Pointer to array of polygon points. The points are laid out like this: polyPoints = {x1,y1,x2,y2 ... } Polypoints has to contain at least (numPoints * 2) entries

Returns: Returns GLIB_OK on if at least one element was drawn, or else error code

◆ GLIB_drawPolygonFilled()

EMSTATUS GLIB_drawPolygonFilled	(	GLIB_Context_t *	`pContext,`
		uint32_t	`numPoints,`
		const int32_t *	`polyPoints`
	)

Draws a filled polygon using a scan line algorithm.

This function draws a line between all points outlining the polygon. The first and last point doesn't have to be the same. The function automatically draws a line from the start point to the end point.

Parameters

`pContext`	Pointer to a GLIB_Context_t where the polygon is drawn. The polygon drawn using the foreground color.
`numPoints`	Number of points in the polygon ( Has to be greater than 1 )
`polyPoints`	Pointer to array of polygon points. The points are laid out like this: polyPoints = {x1,y1,x2,y2 ... } Polypoints has to contain at least (numPoints * 2) entries

Returns: Returns GLIB_OK on success, otherwise a GLIB error code.

◆ GLIB_drawPixelRGB()

EMSTATUS GLIB_drawPixelRGB	(	GLIB_Context_t *	`pContext,`
		int32_t	`x,`
		int32_t	`y,`
		uint8_t	`red,`
		uint8_t	`green,`
		uint8_t	`blue`
	)

Draws a pixel at x, y with color defined by red, green and blue 1 byte per channel.

Example: To draw a yellow pixel at (10, 10). x = 10, y = 10, red = 0xFF, green = 0xFF, blue = 0x00

Parameters

`pContext`	Pointer to a GLIB_Context_t which holds the clipping region
`x`	X-coordinate
`y`	Y-coordinate
`red`	8-bit red code
`green`	8-bit green code
`blue`	8-bit blue code

Returns: Returns DMD_OK on success, or else error code

◆ GLIB_drawPixel()

EMSTATUS GLIB_drawPixel	(	GLIB_Context_t *	`pContext,`
		int32_t	`x,`
		int32_t	`y`
	)

Draws a pixel at x, y using foregroundColor defined in the GLIB_Context_t.

Parameters

`pContext`	Pointer to a GLIB_Context_t which holds the foreground color and clipping region
`x`	X-coordinate
`y`	Y-coordinate

Returns: Returns GLIB_OK on success, or else error code

◆ GLIB_drawPixelColor()

EMSTATUS GLIB_drawPixelColor	(	GLIB_Context_t *	`pContext,`
		int32_t	`x,`
		int32_t	`y,`
		uint32_t	`color`
	)

Draws a pixel at x, y using the color parameter.

Parameters

`pContext`	Pointer to a GLIB_Context_t which holds the clipping region
`x`	X-coordinate
`y`	Y-coordinate
`color`	32-bit int defining the RGB color. The 24 LSB defines the RGB color like this: RRRRRRRRGGGGGGGGBBBBBBBB. Example: Yellow = 0x00FFFF00

Returns: Returns DMD_OK on success, or else error code

Macro Definition Documentation

◆ ECODE_GLIB_BASE

#define ECODE_GLIB_BASE 0x00000000

GLIB Base error code.

◆ GLIB_OK

#define GLIB_OK 0x00000000

Successful call.

◆ GLIB_ERROR_NOTHING_TO_DRAW

#define GLIB_ERROR_NOTHING_TO_DRAW ( ECODE_GLIB_BASE | 0x0001)

Function did not draw.

◆ GLIB_ERROR_INVALID_CHAR

#define GLIB_ERROR_INVALID_CHAR ( ECODE_GLIB_BASE | 0x0002)

Invalid char.

◆ GLIB_OUT_OF_BOUNDS

#define GLIB_OUT_OF_BOUNDS ( ECODE_GLIB_BASE | 0x0003)

Coordinates out of bounds.

◆ GLIB_ERROR_INVALID_CLIPPINGREGION

#define GLIB_ERROR_INVALID_CLIPPINGREGION ( ECODE_GLIB_BASE | 0x0004)

Invalid coordinates (ex.

xMin > xMax)

◆ GLIB_ERROR_INVALID_ARGUMENT

#define GLIB_ERROR_INVALID_ARGUMENT ( ECODE_GLIB_BASE | 0x0005)

Invalid argument.

◆ GLIB_ERROR_OUT_OF_MEMORY

#define GLIB_ERROR_OUT_OF_MEMORY ( ECODE_GLIB_BASE | 0x0006)

Out of memory.

◆ GLIB_ERROR_FILE_NOT_SUPPORTED

#define GLIB_ERROR_FILE_NOT_SUPPORTED ( ECODE_GLIB_BASE | 0x0007)

File not supported.

◆ GLIB_ERROR_IO

#define GLIB_ERROR_IO ( ECODE_GLIB_BASE | 0x0008)

General IO Error.

◆ GLIB_ERROR_INVALID_FILE

#define GLIB_ERROR_INVALID_FILE ( ECODE_GLIB_BASE | 0x0009)

Invalid file.

Enumeration Type Documentation

◆ __GLIB_Font_Class

enum __GLIB_Font_Class

Font classes.

Enumerator
InvalidFont	Invalid font.
FullFont	Characters and numbers font.
NumbersOnlyFont	Numbers only font.

◆ __GLIB_Align

enum __GLIB_Align

Alignment types.

Variable Documentation

◆ GLIB_FontNormal8x8

const GLIB_Font_t GLIB_FontNormal8x8

Normal 8x8 pixels font containing characters and numbers.

◆ GLIB_FontNarrow6x8

const GLIB_Font_t GLIB_FontNarrow6x8

Narrow 6x8 pixels font containing characters and numbers.

◆ GLIB_FontNumber16x20

const GLIB_Font_t GLIB_FontNumber16x20

Large 16x20 pixels font containing only numbers.

GLIB - Graphics Library

Description

Introduction

Initialization

Color

Draw Shapes

Draw Pixels

Font rendering

Draw Bitmap

Example

Modules

Data Structures

Functions

Macros

Enumerations

Variables

Function Documentation

◆ GLIB_contextInit()

◆ GLIB_displayWakeUp()

◆ GLIB_displaySleep()

◆ GLIB_clear()

◆ GLIB_clearRegion()

◆ GLIB_resetDisplayClippingArea()

◆ GLIB_resetClippingRegion()

◆ GLIB_applyClippingRegion()

◆ GLIB_colorTranslate24bpp()

◆ GLIB_rgbColor()

◆ GLIB_rectContainsPoint()

◆ GLIB_normalizeRect()

◆ GLIB_setClippingRegion()

◆ GLIB_drawCircle()

◆ GLIB_drawCircleFilled()

◆ GLIB_drawPartialCircle()

◆ GLIB_setFont()

◆ GLIB_drawString()

◆ GLIB_drawStringOnLine()

◆ GLIB_drawChar()

◆ GLIB_drawBitmap()

◆ GLIB_invertBitmap()

◆ GLIB_drawLine()

◆ GLIB_drawLineH()

◆ GLIB_drawLineV()

◆ GLIB_drawRect()

◆ GLIB_drawRectFilled()

◆ GLIB_drawPolygon()

◆ GLIB_drawPolygonFilled()

◆ GLIB_drawPixelRGB()

◆ GLIB_drawPixel()

◆ GLIB_drawPixelColor()

Macro Definition Documentation

◆ ECODE_GLIB_BASE

◆ GLIB_OK

◆ GLIB_ERROR_NOTHING_TO_DRAW

◆ GLIB_ERROR_INVALID_CHAR

◆ GLIB_OUT_OF_BOUNDS

◆ GLIB_ERROR_INVALID_CLIPPINGREGION

◆ GLIB_ERROR_INVALID_ARGUMENT

◆ GLIB_ERROR_OUT_OF_MEMORY

◆ GLIB_ERROR_FILE_NOT_SUPPORTED

◆ GLIB_ERROR_IO

◆ GLIB_ERROR_INVALID_FILE

Enumeration Type Documentation

◆ __GLIB_Font_Class

◆ __GLIB_Align

Variable Documentation

◆ GLIB_FontNormal8x8

◆ GLIB_FontNarrow6x8

◆ GLIB_FontNumber16x20