#include "libg15render.h"

Functions
void	g15r_clearScreen (g15canvas *canvas, int color)
	Fills the screen with pixels of color.
int	g15r_getPixel (g15canvas *canvas, unsigned int x, unsigned int y)
	Gets the value of the pixel at (x, y)
void	g15r_initCanvas (g15canvas *canvas)
	Clears the canvas and resets the mode switches.
void	g15r_setPixel (g15canvas *canvas, unsigned int x, unsigned int y, int val)
	Sets the value of the pixel at (x, y)

Function Documentation

void g15r_clearScreen	(	g15canvas *	canvas,
		int	color
	)

Fills the screen with pixels of color.

Clears the screen and fills it with pixels of color

Parameters:

canvas	A pointer to a g15canvas struct in which the buffer to be operated on is found.
color	Screen will be filled with this color.

Definition at line 80 of file screen.c.

References g15canvas::buffer, and G15_BUFFER_LEN.

{
  memset (canvas->buffer, (color ? 0xFF : 0), G15_BUFFER_LEN);
}

int g15r_getPixel	(	g15canvas *	canvas,
		unsigned int	x,
		unsigned int	y
	)

Gets the value of the pixel at (x, y)

Retrieves the value of the pixel at (x, y)

Parameters:

canvas	A pointer to a g15canvas struct in which the buffer to be operated on is found.
x	X offset for pixel to be retrieved.
y	Y offset for pixel to be retrieved.

Definition at line 29 of file screen.c.

References g15canvas::buffer, BYTE_SIZE, G15_LCD_HEIGHT, and G15_LCD_WIDTH.

Referenced by g15r_pixelReverseFill(), and g15r_setPixel().

{
  if (x >= G15_LCD_WIDTH || y >= G15_LCD_HEIGHT)
    return 0;

  unsigned int pixel_offset = y * G15_LCD_WIDTH + x;
  unsigned int byte_offset = pixel_offset / BYTE_SIZE;
  unsigned int bit_offset = 7 - (pixel_offset % BYTE_SIZE);

  return (canvas->buffer[byte_offset] & (1 << bit_offset)) >> bit_offset;
}

void g15r_initCanvas ( g15canvas * canvas )

Clears the canvas and resets the mode switches.

Clears the screen and resets the mode values for a canvas

Parameters:

canvas A pointer to a g15canvas struct

Definition at line 91 of file screen.c.

References g15canvas::buffer, g15canvas::ftLib, G15_BUFFER_LEN, g15canvas::mode_cache, g15canvas::mode_reverse, and g15canvas::mode_xor.

{
  memset (canvas->buffer, 0, G15_BUFFER_LEN);
  canvas->mode_cache = 0;
  canvas->mode_reverse = 0;
  canvas->mode_xor = 0;
#ifdef TTF_SUPPORT
  if (FT_Init_FreeType (&canvas->ftLib))
    printf ("Freetype couldnt initialise\n");
#endif
}

void g15r_setPixel	(	g15canvas *	canvas,
		unsigned int	x,
		unsigned int	y,
		int	val
	)

Sets the value of the pixel at (x, y)

Parameters:

canvas	A pointer to a g15canvas struct in which the buffer to be operated on is found.
x	X offset for pixel to be set.
y	Y offset for pixel to be set.
val	Value to which pixel should be set.

Definition at line 50 of file screen.c.

References g15canvas::buffer, BYTE_SIZE, G15_LCD_HEIGHT, G15_LCD_WIDTH, g15r_getPixel(), g15canvas::mode_reverse, and g15canvas::mode_xor.

Referenced by draw_ttf_char(), g15r_drawCircle(), g15r_drawIcon(), g15r_drawLine(), g15r_drawRoundBox(), g15r_drawSprite(), g15r_pixelBox(), g15r_pixelOverlay(), g15r_pixelReverseFill(), g15r_renderCharacterLarge(), g15r_renderCharacterMedium(), and g15r_renderCharacterSmall().

{
  if (x >= G15_LCD_WIDTH || y >= G15_LCD_HEIGHT)
    return;

  unsigned int pixel_offset = y * G15_LCD_WIDTH + x;
  unsigned int byte_offset = pixel_offset / BYTE_SIZE;
  unsigned int bit_offset = 7 - (pixel_offset % BYTE_SIZE);

  if (canvas->mode_xor)
    val ^= g15r_getPixel (canvas, x, y);
  if (canvas->mode_reverse)
    val = !val;

  if (val)
    canvas->buffer[byte_offset] =
      canvas->buffer[byte_offset] | 1 << bit_offset;
  else
    canvas->buffer[byte_offset] =
      canvas->buffer[byte_offset] & ~(1 << bit_offset);

}

screen.c File Reference

Functions

Function Documentation