102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
|
|
This file is part of g15tools.
|
|
|
|
g15tools is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
g15tools is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with g15lcd; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libg15render.h"
|
|
|
|
/**
|
|
* Retrieves the value of the pixel at (x, y)
|
|
*
|
|
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
|
|
* \param x X offset for pixel to be retrieved.
|
|
* \param y Y offset for pixel to be retrieved.
|
|
*/
|
|
int
|
|
g15r_getPixel (g15canvas * canvas, unsigned int x, unsigned int y)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Sets the value of the pixel at (x, y)
|
|
*
|
|
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
|
|
* \param x X offset for pixel to be set.
|
|
* \param y Y offset for pixel to be set.
|
|
* \param val Value to which pixel should be set.
|
|
*/
|
|
void
|
|
g15r_setPixel (g15canvas * canvas, unsigned int x, unsigned int y, int val)
|
|
{
|
|
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);
|
|
|
|
}
|
|
|
|
/**
|
|
* Clears the screen and fills it with pixels of color
|
|
*
|
|
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
|
|
* \param color Screen will be filled with this color.
|
|
*/
|
|
void
|
|
g15r_clearScreen (g15canvas * canvas, int color)
|
|
{
|
|
memset (canvas->buffer, (color ? 0xFF : 0), G15_BUFFER_LEN);
|
|
}
|
|
|
|
/**
|
|
* Clears the screen and resets the mode values for a canvas
|
|
*
|
|
* \param canvas A pointer to a g15canvas struct
|
|
*/
|
|
void
|
|
g15r_initCanvas (g15canvas * canvas)
|
|
{
|
|
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
|
|
}
|