Component: GLCD Bitmap Drawer ROM (Graphical Library): Difference between revisions

Latest revision as of 14:36, 13 July 2026

Author	Matrix TSL
Version	3.0
Category	Graphical Library

GLCD Bitmap Drawer ROM component

A component to simplify the process of drawing bitmap images to a graphical display. Stores up to 10 bitmap images inside ROM based look up tables. Compatible with 24-bit / 256 Colour / 16 Colour / Monochrome Bitmaps. The gLCD object property specifies which LCD component to draw the bitmap to. Compatible with GLCD, NeoPixel, MIACv3, HT16K33

Version information

Library Version, Component Version, Date, Author, Info
13, 2.2, 22-07-24, BR, Updated Bitmap Mono Dummy Component - Testing
14, 2.3, 24-07-24, BR, Fixed a problem with file size reporting of 4/8 bit bitmaps
14, 2.3, 24-07-24, BR, Added Pallet size information for 4/8 bit bitmaps
15, 2.3, 24-07-24, BR, Reduced stored Pallet size by 1/4
16, 2.3, 26-07-24, BR, Added reload file property allowing for easier way to update bitmaps from source
17, 2.4, 12-08-24, BR, Added LookupFilename function to allow the component to work with DisplayManager

Detailed description

No detailed description exists yet for this component

Examples

The Bitmap Drawer component must be linked to the graphical LCD using the gLCD Object property.

Here is an example which loops drawing a monochrome and 24-bit bitmaps to the EBM001 graphical display.

Bitmap Drawer Demo

The bitmap files used in the example can be found here.

Bitmap Drawer Files

Here is another example which overlays several monochrome images to give the impression of animation. Shows a pair of eyes, which can randomly and momentarily look left, right or blink.

Bitmap Drawer Demo 2

The bitmap files used in the example can be found here.

Bitmap Drawer Files 2

Macro reference

Display_BMP

	Display_BMP
Draws the bitmap image from ROM onto the display at the corrdinates X and Y.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- BYTE	Orientation
0=Normal, 1=90 Degrees CW, 2=180 Degrees, 3=270 Degrees CW
- BYTE	Transparency
0=Off, 1=On Don't Draw Any Pixels which match the transparent colour
- BYTE	Flip
0=Normal, 1=FlipWidth, 2=FlipHeight, 3=FlipBoth
- VOID	Return

Display_BMP_Fast

	Display_BMP_Fast
Draws the bitmap image from ROM onto the display at the corrdinates X and Y. Speeds up drawing by not assigning X/Y coordinate for each pixel. Currently only supports colour displays.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- BOOL	Mode
0=RowByRow, 1=FullWindow(Y Flipped)
- VOID	Return

Display_BMP_Fast_Partial

	Display_BMP_Fast_Partial
Draws a partial bitmap image from ROM onto the display at the coordinates X and Y. Speeds up drawing by not assigning X/Y coordinate for each pixel. Allows drawing a percentage of the bitmap width and height from a specified side (top/bottom, left/right). Currently only supports colour displays.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- BYTE	WidthPercent
Percentage of bitmap width to draw. Range: 0-100
- BYTE	HeightPercent
Percentage of bitmap height to draw. Range: 0-100
- BYTE	HorizontalSide
Which horizontal side to draw from: 0=Left, 1=Right
- BYTE	VerticalSide
Which vertical side to draw from: 0=Top, 1=Bottom
- BOOL	Mode
0=RowByRow, 1=FullWindow(Y Flipped)
- VOID	Return

Display_BMP_Partial

	Display_BMP_Partial
Draws a partial bitmap image from ROM onto the display at the coordinates X and Y. Allows drawing a percentage of the bitmap width and height from a specified side (top/bottom, left/right).
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- BYTE	WidthPercent
Percentage of bitmap width to draw. Range: 0-100
- BYTE	HeightPercent
Percentage of bitmap height to draw. Range: 0-100
- BYTE	HorizontalSide
Which horizontal side to draw from: 0=Left, 1=Right
- BYTE	VerticalSide
Which vertical side to draw from: 0=Top, 1=Bottom
- BYTE	Orientation
0=Normal, 1=90 Degrees CW, 2=180 Degrees, 3=270 Degrees CW
- BYTE	Transparency
0=Off, 1=On Don't Draw Any Pixels which match the transparent colour
- BYTE	Flip
0=Normal, 1=FlipWidth, 2=FlipHeight, 3=FlipBoth
- VOID	Return

Display_Scaled_BMP

	Display_Scaled_BMP
Draws the bitmap image from ROM onto the display at the corrdinates X and Y. Scales the bitmap to the specified width and height.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- UINT	Width
The size in pixels to draw the bitmap image
- UINT	Height
The size in pixels to draw the bitmap image
- BYTE	Orientation
0=Normal, 1=90 Degrees CW, 2=180 Degrees, 3=270 Degrees CW
- BYTE	Transparency
0=Off, 1=On Don't Draw Any Pixels which match the transparent colour
- BYTE	Flip
0=Normal, 1=FlipWidth, 2=FlipHeight, 3=FlipBoth
- VOID	Return

Display_Scaled_BMP_Fast

	Display_Scaled_BMP_Fast
Draws the bitmap image from ROM onto the display at the corrdinates X and Y. Scales the bitmap to the specified width and height. Speeds up drawing by not assigning X/Y coordinate for each pixel. Currently only supports colour displays.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	X
X Axis coordinate, specifies the location of the left edge of the bitmap image
- UINT	Y
Y Axis coordinate, specifies the location of the top edge of the bitmap image
- UINT	Width
The size in pixels to draw the bitmap image
- UINT	Height
The size in pixels to draw the bitmap image
- BOOL	Mode
0=RowByRow, 1=FullWindow(Y Flipped)
- VOID	Return

GetHeight

	GetHeight
Returns the height of the loaded bitmap file in pixels.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	Return

GetWidth

	GetWidth
Returns the width of the loaded bitmap file in pixels.
- BYTE	BitmapIndex
Selects from attached bitmaps. Range: 0-9
- UINT	Return

LookupFilename

	LookupFilename
Checks to see if one of the loaded files matches the supplied filename. If a match is found then returns the bitmap index 0-9. If no match is found then returns 255.
- STRING	Filename
Filename without the included path e.g. "sprite.bmp", not case sensitive
- BYTE	Return

SetTransparentColour

	SetTransparentColour
Sets the transparency colour, the colour that is not drawn when transparency is enabled.
- BYTE	R

- BYTE	G

- BYTE	B

- VOID	Return

Property reference

	Properties
	LinkTo

	ColourDisplay
Automatically detects if the graphical LCD object is colour or monochrome
	ROM Bytes
Total number of ROM bytes used to store attached bitmap images.
	Number of Bitmaps
Number of bitmaps the component can store and draw to the LCD. Min 1 / Max 10
	Reload Bitmaps
Reloads all bitmaps from source, useful to do when the bitmap files change. Will automatically reset to No when complete.
	Bitmap 0
	Bitmap File
Bitmap file you wish to embed into the program. Compatible with .bmp files in the following formats: 24-Bit / 256 Colour / 16 Colour / Monochrome
	File Colour Depth
Number of bits per pixel. Currently the component only supports bitmap files with 1-bit or 24-bit colour depth.
	File Width
Width of the bitmap file in pixels
	File Height
Height of the bitmap file in pixels
	File Length
The number of bytes of ROM the bitmap file will consume. You can vie wthe number of ROM bytes available on your target device using the Device Helper component.
	Pallet Size
Number of bytes in the file length used to store the colour pallet