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libg15render/src/pixel.c
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/*
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 <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <math.h>
#include "libg15render.h"
void
swap (int *x, int *y)
{
int tmp;
tmp = *x;
*x = *y;
*y = tmp;
}
/**
* The area with an upper left corner at (x1, y1) and lower right corner at (x2, y2) will be
* filled with color if fill>0 or the current contents of the area will be reversed if fill==0.
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines leftmost bound of area to be filled.
* \param y1 Defines uppermost bound of area to be filled.
* \param x2 Defines rightmost bound of area to be filled.
* \param y2 Defines bottommost bound of area to be filled.
* \param fill Area will be filled with color if fill != 0, else contents of area will have color values reversed.
* \param color If fill != 0, then area will be filled if color == 1 and emptied if color == 0.
*/
void
g15r_pixelReverseFill (g15canvas * canvas, int x1, int y1, int x2, int y2,
int fill, int color)
{
int x = 0;
int y = 0;
for (x = x1; x <= x2; ++x)
{
for (y = y1; y <= y2; ++y)
{
if (!fill)
color = !g15r_getPixel (canvas, x, y);
g15r_setPixel (canvas, x, y, color);
}
}
}
/**
* A 1-bit bitmap defined in colormap[] is drawn to the canvas with an upper left corner at (x1, y1)
* and a lower right corner at (x1+width, y1+height).
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines the leftmost bound of the area to be drawn.
* \param y1 Defines the uppermost bound of the area to be drawn.
* \param width Defines the width of the bitmap to be drawn.
* \param height Defines the height of the bitmap to be drawn.
* \param colormap An array containing width*height entries of value 0 for pixel off or != 0 for pixel on.
*/
void
g15r_pixelOverlay (g15canvas * canvas, int x1, int y1, int width, int height,
short colormap[])
{
int i = 0;
for (i = 0; i < (width * height); ++i)
{
int color = (colormap[i] ? G15_COLOR_BLACK : G15_COLOR_WHITE);
int x = x1 + i % width;
int y = y1 + i / width;
g15r_setPixel (canvas, x, y, color);
}
}
/**
* A line of color is drawn from (px1, py1) to (px2, py2).
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param px1 X component of point 1.
* \param py1 Y component of point 1.
* \param px2 X component of point 2.
* \param py2 Y component of point 2.
* \param color Line will be drawn this color.
*/
void
g15r_drawLine (g15canvas * canvas, int px1, int py1, int px2, int py2,
const int color)
{
/*
* Bresenham's Line Algorithm
* http://en.wikipedia.org/wiki/Bresenham's_algorithm
*/
int steep = 0;
if (abs (py2 - py1) > abs (px2 - px1))
steep = 1;
if (steep)
{
swap (&px1, &py1);
swap (&px2, &py2);
}
if (px1 > px2)
{
swap (&px1, &px2);
swap (&py1, &py2);
}
int dx = px2 - px1;
int dy = abs (py2 - py1);
int error = 0;
int y = py1;
int ystep = (py1 < py2) ? 1 : -1;
int x = 0;
for (x = px1; x <= px2; ++x)
{
if (steep)
g15r_setPixel (canvas, y, x, color);
else
g15r_setPixel (canvas, x, y, color);
error += dy;
if (2 * error >= dx)
{
y += ystep;
error -= dx;
}
}
}
/**
* Draws a box around the area bounded by (x1, y1) and (x2, y2).
*
* The box will be filled if fill != 0 and the sides will be thick pixels wide.
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines leftmost bound of the box.
* \param y1 Defines uppermost bound of the box.
* \param x2 Defines rightmost bound of the box.
* \param y2 Defines bottommost bound of the box.
* \param color Lines defining the box will be drawn this color.
* \param thick Lines defining the box will be this many pixels thick.
* \param fill The box will be filled with color if fill != 0.
*/
void
g15r_pixelBox (g15canvas * canvas, int x1, int y1, int x2, int y2, int color,
int thick, int fill)
{
int i = 0;
for (i = 0; i < thick; ++i)
{
g15r_drawLine (canvas, x1, y1, x2, y1, color); /* Top */
g15r_drawLine (canvas, x1, y1, x1, y2, color); /* Left */
g15r_drawLine (canvas, x2, y1, x2, y2, color); /* Right */
g15r_drawLine (canvas, x1, y2, x2, y2, color); /* Bottom */
x1++;
y1++;
x2--;
y2--;
}
int x = 0, y = 0;
if (fill)
{
for (x = x1; x <= x2; ++x)
for (y = y1; y <= y2; ++y)
g15r_setPixel (canvas, x, y, color);
}
}
/**
* Draws a circle centered at (x, y) with a radius of r.
*
* The circle will be filled if fill != 0.
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x Defines horizontal center of the circle.
* \param y Defines vertical center of circle.
* \param r Defines radius of circle.
* \param fill The circle will be filled with color if fill != 0.
* \param color Lines defining the circle will be drawn this color.
*/
void
g15r_drawCircle (g15canvas * canvas, int x, int y, int r, int fill, int color)
{
int xx, yy, dd;
xx = 0;
yy = r;
dd = 2 * (1 - r);
while (yy >= 0)
{
if (!fill)
{
g15r_setPixel (canvas, x + xx, y - yy, color);
g15r_setPixel (canvas, x + xx, y + yy, color);
g15r_setPixel (canvas, x - xx, y - yy, color);
g15r_setPixel (canvas, x - xx, y + yy, color);
}
else
{
g15r_drawLine (canvas, x - xx, y - yy, x + xx, y - yy, color);
g15r_drawLine (canvas, x - xx, y + yy, x + xx, y + yy, color);
}
if (dd + yy > 0)
{
yy--;
dd = dd - (2 * yy + 1);
}
if (xx > dd)
{
xx++;
dd = dd + (2 * xx + 1);
}
}
}
/**
* Draws a rounded box around the area bounded by (x1, y1) and (x2, y2).
*
* The box will be filled if fill != 0.
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines leftmost bound of the box.
* \param y1 Defines uppermost bound of the box.
* \param x2 Defines rightmost bound of the box.
* \param y2 Defines bottommost bound of the box.
* \param fill The box will be filled with color if fill != 0.
* \param color Lines defining the box will be drawn this color.
*/
void
g15r_drawRoundBox (g15canvas * canvas, int x1, int y1, int x2, int y2,
int fill, int color)
{
int y, shave = 3;
if (shave > (x2 - x1) / 2)
shave = (x2 - x1) / 2;
if (shave > (y2 - y1) / 2)
shave = (y2 - y1) / 2;
if ((x1 != x2) && (y1 != y2))
{
if (fill)
{
g15r_drawLine (canvas, x1 + shave, y1, x2 - shave, y1, color);
for (y = y1 + 1; y < y1 + shave; y++)
g15r_drawLine (canvas, x1 + 1, y, x2 - 1, y, color);
for (y = y1 + shave; y <= y2 - shave; y++)
g15r_drawLine (canvas, x1, y, x2, y, color);
for (y = y2 - shave + 1; y < y2; y++)
g15r_drawLine (canvas, x1 + 1, y, x2 - 1, y, color);
g15r_drawLine (canvas, x1 + shave, y2, x2 - shave, y2, color);
if (shave == 4)
{
g15r_setPixel (canvas, x1 + 1, y1 + 1,
color ==
G15_COLOR_WHITE ? G15_COLOR_BLACK :
G15_COLOR_WHITE);
g15r_setPixel (canvas, x1 + 1, y2 - 1,
color ==
G15_COLOR_WHITE ? G15_COLOR_BLACK :
G15_COLOR_WHITE);
g15r_setPixel (canvas, x2 - 1, y1 + 1,
color ==
G15_COLOR_WHITE ? G15_COLOR_BLACK :
G15_COLOR_WHITE);
g15r_setPixel (canvas, x2 - 1, y2 - 1,
color ==
G15_COLOR_WHITE ? G15_COLOR_BLACK :
G15_COLOR_WHITE);
}
}
else
{
g15r_drawLine (canvas, x1 + shave, y1, x2 - shave, y1, color);
g15r_drawLine (canvas, x1, y1 + shave, x1, y2 - shave, color);
g15r_drawLine (canvas, x2, y1 + shave, x2, y2 - shave, color);
g15r_drawLine (canvas, x1 + shave, y2, x2 - shave, y2, color);
if (shave > 1)
{
g15r_drawLine (canvas, x1 + 1, y1 + 1, x1 + shave - 1, y1 + 1,
color);
g15r_drawLine (canvas, x2 - shave + 1, y1 + 1, x2 - 1, y1 + 1,
color);
g15r_drawLine (canvas, x1 + 1, y2 - 1, x1 + shave - 1, y2 - 1,
color);
g15r_drawLine (canvas, x2 - shave + 1, y2 - 1, x2 - 1, y2 - 1,
color);
g15r_drawLine (canvas, x1 + 1, y1 + 1, x1 + 1, y1 + shave - 1,
color);
g15r_drawLine (canvas, x1 + 1, y2 - 1, x1 + 1, y2 - shave + 1,
color);
g15r_drawLine (canvas, x2 - 1, y1 + 1, x2 - 1, y1 + shave - 1,
color);
g15r_drawLine (canvas, x2 - 1, y2 - 1, x2 - 1, y2 - shave + 1,
color);
}
}
}
}
/**
* Given a maximum value, and a value between 0 and that maximum value, calculate and draw a bar showing that percentage.
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines leftmost bound of the bar.
* \param y1 Defines uppermost bound of the bar.
* \param x2 Defines rightmost bound of the bar.
* \param y2 Defines bottommost bound of the bar.
* \param color The bar will be drawn this color.
* \param num Number of units relative to max filled.
* \param max Number of units equal to 100% filled.
* \param type Type of bar. 1=solid bar, 2=solid bar with border, 3 = solid bar with I-frame.
*/
void
g15r_drawBar (g15canvas * canvas, int x1, int y1, int x2, int y2, int color,
int num, int max, int type)
{
float len, length;
int x;
if (max <= 0 || num <= 0)
return;
if (num > max)
num = max;
if (type == 2)
{
y1 += 2;
y2 -= 2;
x1 += 2;
x2 -= 2;
}
len = ((float) max / (float) num);
length = (x2 - x1) / len;
if (type == 1)
{
g15r_pixelBox (canvas, x1, y1 - type, x2, y2 + type, color ^ 1, 1, 1);
g15r_pixelBox (canvas, x1, y1 - type, x2, y2 + type, color, 1, 0);
}
else if (type == 2)
{
g15r_pixelBox (canvas, x1 - 2, y1 - type, x2 + 2, y2 + type, color ^ 1,
1, 1);
g15r_pixelBox (canvas, x1 - 2, y1 - type, x2 + 2, y2 + type, color, 1,
0);
}
else if (type == 3)
{
g15r_drawLine (canvas, x1, y1 - type, x1, y2 + type, color);
g15r_drawLine (canvas, x2, y1 - type, x2, y2 + type, color);
g15r_drawLine (canvas, x1, y1 + ((y2 - y1) / 2), x2,
y1 + ((y2 - y1) / 2), color);
}
g15r_pixelBox (canvas, x1, y1, (int) ceil (x1 + length), y2, color, 1, 1);
}
/**
* wbmp splash screen loader - assumes image is 160x43
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param filename A string holding the path to the wbmp to be displayed.
*/
int
g15r_loadWbmpSplash(g15canvas *canvas, char *filename)
{
int width=0, height=0;
char *buf;
buf = g15r_loadWbmpToBuf(filename,
&width,
&height);
memcpy (canvas->buffer, buf, G15_BUFFER_LEN);
return 0;
}
/**
* Draw an icon to a canvas
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated in is found.
* \param buf A pointer to the buffer holding the icon to be displayed.
* \param my_x Leftmost boundary of image.
* \param my_y Topmost boundary of image.
* \param width Width of the image in buf.
* \param height Height of the image in buf.
*/
void
g15r_drawIcon(g15canvas *canvas, char *buf, int my_x, int my_y, int width, int height)
{
int y,x,val;
unsigned int pixel_offset = 0;
unsigned int byte_offset, bit_offset;
for (y=0; y < height - 1; y++)
for (x=0; x < width - 1; x++)
{
pixel_offset = y * width + x;
byte_offset = pixel_offset / BYTE_SIZE;
bit_offset = 7 - (pixel_offset % BYTE_SIZE);
val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
g15r_setPixel (canvas, x + my_x, y + my_y, val);
}
}
/**
* Draw a sprite to a canvas
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated in is found.
* \param buf A pointer to the buffer holding a set of sprites.
* \param my_x Leftmost boundary of image.
* \param my_y Topmost boundary of image.
* \param width Width of the sprite.
* \param height Height of the sprite.
* \param start_x X offset for reading sprite from buf.
* \param start_y Y offset for reading sprite from buf.
* \param total_width Width of the set of sprites held in buf.
*/
void
g15r_drawSprite(g15canvas *canvas, char *buf, int my_x, int my_y, int width, int height, int start_x, int start_y, int total_width)
{
int y,x,val;
unsigned int pixel_offset = 0;
unsigned int byte_offset, bit_offset;
for (y=0; y < height - 1; y++)
for (x=0; x < width - 1; x++)
{
pixel_offset = (y + start_y) * total_width + (x + start_x);
byte_offset = pixel_offset / BYTE_SIZE;
bit_offset = 7 - (pixel_offset % BYTE_SIZE);
val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
g15r_setPixel (canvas, x + my_x, y + my_y, val);
}
}
/**
* basic wbmp loader - loads a wbmp image into a buffer.
*
* \param filename A string holding the path to the wbmp to be loaded.
* \param img_width A pointer to an int that will hold the image width on return.
* \param img_height A pointer to an int that will hold the image height on return.
*/
char *
g15r_loadWbmpToBuf(char *filename, int *img_width, int *img_height)
{
int wbmp_fd;
int retval;
int x,y,val;
char *buf;
unsigned int buflen,header=4;
unsigned char headerbytes[5];
unsigned int pixel_offset = 0;
unsigned int byte_offset, bit_offset;
wbmp_fd=open(filename,O_RDONLY);
if(!wbmp_fd){
return NULL;
}
retval=read(wbmp_fd,headerbytes,5);
if(retval){
if (headerbytes[2] & 1) {
*img_width = ((unsigned char)headerbytes[2] ^ 1) | (unsigned char)headerbytes[3];
*img_height = headerbytes[4];
header = 5;
} else {
*img_width = headerbytes[2];
*img_height = headerbytes[3];
}
int byte_width = *img_width / 8;
if (*img_width %8)
byte_width++;
buflen = byte_width * (*img_height);
buf = (char *)malloc (buflen);
if (buf == NULL)
return NULL;
if (header == 4)
buf[0]=headerbytes[4];
retval=read(wbmp_fd,buf+(5-header),buflen);
close(wbmp_fd);
}
/* now invert the image */
for (y = 0; y < *img_height; y++)
for (x = 0; x < *img_width; x++)
{
pixel_offset = y * (*img_width) + x;
byte_offset = pixel_offset / BYTE_SIZE;
bit_offset = 7 - (pixel_offset % BYTE_SIZE);
val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
if (!val)
buf[byte_offset] = buf[byte_offset] | 1 << bit_offset;
else
buf[byte_offset] = buf[byte_offset] & ~(1 << bit_offset);
}
return buf;
}
/**
* Draw a large number to a canvas
*
* \param canvas A pointer to a g15canvas struct in which the buffer to be operated on is found.
* \param x1 Defines leftmost bound of the number.
* \param y1 Defines uppermost bound of the number.
* \param x2 Defines rightmost bound of the number.
* \param y2 Defines bottommost bound of the number.
* \param num The number to be drawn.
*/
void
g15r_drawBigNum (g15canvas * canvas, unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, int color, int num)
{
x1 += 2;
x2 -= 2;
switch(num){
case 0:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1 +5, y1 +5, x2 -5, y2 - 6, 1 - color, 1, 1);
break;
case 1:
g15r_pixelBox (canvas, x2-5, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1, y1, x2 -5, y2, 1 - color, 1, 1);
break;
case 2:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1, y1+5, x2 -5, y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2 , y2-6, 1 - color, 1, 1);
break;
case 3:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1, y1+5, x2 -5, y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
break;
case 4:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2 -5, y2, 1 - color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
break;
case 5:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+5, x2 , y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
break;
case 6:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+5, x2 , y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
break;
case 7:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1, y1+5, x2 -5, y2, 1 - color, 1, 1);
break;
case 8:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+5, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
break;
case 9:
g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
g15r_pixelBox (canvas, x1+5, y1+5, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2, 1 - color, 1, 1);
break;
case 10:
g15r_pixelBox (canvas, x2-5, y1+5, x2, y1+10 , color, 1, 1);
g15r_pixelBox (canvas, x2-5, y2-10, x2, y2-5 , color, 1, 1);
break;
case 11:
g15r_pixelBox (canvas, x1, y1+((y2/2)-2), x2, y1+((y2/2)+2), color, 1, 1);
break;
case 12:
g15r_pixelBox (canvas, x2-5, y2-5, x2, y2 , color, 1, 1);
break;
}
}
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