rotation.c File Reference

This application demonstrates image rotation and bilinear interpolation. More...

#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <math.h>
#include <stdio.h>
#include <UEFIStarter/graphics.h>
#include <UEFIStarter/core.h>

Macros
#define	ARG_RADIUS   args[0].value.uint64
	shortcut macro to access "radius" command-line parameter
#define	RGBA(R, G, B, A)   {B,G,R,A}
	shortcut macro: defines an EFI_GRAPHICS_OUTPUT_BLT_PIXEL color value More...

Functions
void	draw_gradient ()
	This draws an animated gradient. More...
void	draw_circle ()
	internal: draws the image to be rotated to the full-screen graphics buffer
void	rotate_buffer ()
	Animates a rotating image.
int	main (int argc, char **argv_ascii)
	Main function, gets invoked by UEFI shell. More...

Variables
EFI_GRAPHICS_OUTPUT_BLT_PIXEL *	buffer2
	additional buffer required to rotate image
cmdline_argument_t	args []
	list of command-line arguments More...
cmdline_argument_group_t	arggroup ={ L"Application-specific options" ,sizeof( args )/sizeof(cmdline_argument_t), args }
	application-specific command-line argument group

Detailed Description

This application demonstrates image rotation and bilinear interpolation.

You'll need to run this in a graphics-capable environment, see gop.c

Author

Richard Nusser

Copyright

2017-2018 Richard Nusser

License

GPLv3 (see http://www.gnu.org/licenses/)

See also

https://github.com/rinusser/UEFIStarter

Macro Definition Documentation

RGBA

#define RGBA	(		R,
			G,
			B,
			A
	)		{B,G,R,A}

shortcut macro: defines an EFI_GRAPHICS_OUTPUT_BLT_PIXEL color value

Parameters

R	red
G	green
B	blue
A	alpha/reserved

Function Documentation

draw_gradient()

void draw_gradient

(

)

This draws an animated gradient.

It's actually a bilinear interpolation between the 4 corners of the screen: the corner colors change between frames.

main()

int main	(	int	argc,
		char **	argv_ascii
	)

Main function, gets invoked by UEFI shell.

Parameters

argc	the number of command-line arguments passed
argv_ascii	the command-line arguments passed, as ASCII

Returns

an EFI status code for the shell

Variable Documentation

args

cmdline_argument_t args[]

Initial value:

={
  {{uint64:50},ARG_INT,NULL,L"-radius",L"circle radius [px]"}
}

list of command-line arguments