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major cleanup to avoid segfaults when fetching data, added fbdata module, refactored all methods to use a central screen object

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This commit is contained in:
Florian Klemenz 2022-05-04 12:25:42 +02:00
parent 6c3c870f5e
commit 61559bb60f
6 changed files with 285 additions and 282 deletions
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16
Makefile
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@ -2,16 +2,20 @@
# # sudo apt-get install libmariadb-dev # # sudo apt-get install libmariadb-dev
# # mariadb_config --libs # # mariadb_config --libs
# #
CFLAGS=-g -Wall -lm -L/usr/lib/arm-linux-gnueabihf -lmariadb -I/usr/include/mariadb CFLAGS=-g -Wall -lm
DBFLAGS=-L/usr/lib/arm-linux-gnueabihf -lmariadb -I/usr/include/mariadb
fbdash: fbdash.c fblib.o fbfont.o fbdash: fbdash.c fblib.o fbfont.o fbdata.o
gcc -o $@ fblib.o fbfont.o $< $(CFLAGS) gcc -o $@ fblib.o fbfont.o fbdata.o $< $(CFLAGS) $(DBFLAGS)
fblib.o: fblib.c fblib.h fblib.o: fblib.c fblib.h
gcc -c fblib.c gcc -c fblib.c $(CFLAGS)
fbfont.o: fbfont.c fbfont.h fbfont.o: fbfont.c fbfont.h
gcc -c fbfont.c gcc -c fbfont.c $(CFLAGS)
fbdata.o: fbdata.c fbdata.h
gcc -c fbdata.c $(CFLAGS) $(DBFLAGS)
clean: clean:
rm -f fbdash fblib.o fbfont.o rm -f fbdash fblib.o fbfont.o fbdata.o

190
fbdash.c
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@ -3,8 +3,10 @@
* *
* Adapted by Florian Klemenz for use in the fb_dash project * Adapted by Florian Klemenz for use in the fb_dash project
* *
* Source and all credit goes to * Credit for most of the framebuffer-related source code goes to
* http://raspberrycompote.blogspot.com/ * http://raspberrycompote.blogspot.com/
* Thanks for providing an excellent tutorial!
* -------------------------------------------------------------------------------------------- * --------------------------------------------------------------------------------------------
* *
* http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html * http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
@ -27,164 +29,80 @@
#include <fcntl.h> #include <fcntl.h>
#include <float.h> #include <float.h>
#include <mysql.h>
#include "fblib.h" #include "fblib.h"
#include "fbdata.h"
#define DEVICE "/dev/fb1"
#define WIDTH 240 #define WIDTH 240
#define HEIGHT 320 #define HEIGHT 320
#define BITS_PER_PIXEL 16
char *fbp = 0; void updateSlot(screen fb, sourcedata data, int x_offset, int y_offset, color c) {
render_string(fb, ubuntu_mono_24, data.text, x_offset, y_offset, c.r, c.g, c.b);
struct s_color { if (data.temperature) render_string(fb, ubuntu_mono_48, data.temperature, x_offset + 115, y_offset - 9, c.r, c.g, c.b);
unsigned char r; render_string(fb, ubuntu_mono_48, "C", x_offset + 195, y_offset - 9, c.r, c.g, c.b);
unsigned char g;
unsigned char b;
};
typedef struct s_color color;
struct s_sourcedata { if (data.humidity) render_string(fb, ubuntu_mono_48, data.humidity, x_offset + 115, y_offset + 26, c.r, c.g, c.b);
char* text; render_string(fb, ubuntu_mono_48, "%", x_offset + 195, y_offset + 26, c.r, c.g, c.b);
char* temperature;
char* humidity;
};
typedef struct s_sourcedata sourcedata;
void finish_with_error(MYSQL *con) {
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
} }
void updateSlot(char *fbp, sourcedata data, int x_offset, int y_offset, color c) { void draw(screen fb) {
render_string(fbp, ubuntu_mono_24, data.text, x_offset, y_offset, c.r, c.g, c.b); clear_screen(fb);
render_string(fbp, ubuntu_mono_48, data.temperature, x_offset + 115, y_offset - 9, c.r, c.g, c.b); int slot_height = fb.height / 4;
render_string(fbp, ubuntu_mono_48, "C", x_offset + 195, y_offset - 9, c.r, c.g, c.b);
render_string(fbp, ubuntu_mono_48, data.humidity, x_offset + 115, y_offset + 26, c.r, c.g, c.b);
render_string(fbp, ubuntu_mono_48, "%", x_offset + 195, y_offset + 26, c.r, c.g, c.b);
}
void updateData(char *fbp, int slot_height) {
// query database for latest values
printf("MySQL client version: %s\n", mysql_get_client_info());
MYSQL *con = mysql_init(NULL);
if (con == NULL) {
fprintf(stderr, "%s\n", mysql_error(con));
exit(1);
}
if (mysql_real_connect(con, "web-pi", "grafanaReader", "grafanaReader", "grafanaData", 0, NULL, 0) == NULL) {
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
}
char* query = "\
SELECT \
time, \
source, \
metric, \
value \
FROM readings AS r \
INNER JOIN sources AS s ON r.source_id = s.id \
INNER JOIN metrics AS m ON r.metric_id = m.id \
WHERE \
time > (NOW() - 60 * 15) AND \
metric IN ('Luftfeuchte','Temperatur') AND \
source IN ('Esszimmer','Wohnzimmer', 'Schlafzimmer', 'Abstellkammer') \
ORDER BY time DESC \
LIMIT 100;";
//printf("%s\n",query);
printf("Fetching data ...\n");
if (mysql_query(con, query)) {
finish_with_error(con);
}
MYSQL_RES *result = mysql_store_result(con);
if (result == NULL) {
finish_with_error(con);
}
// define what to display
sourcedata data[4] = {
{ "Esszimmer", NULL, NULL },
{ "Wohnzimmer", NULL, NULL },
{ "Schlafzimmer", NULL, NULL },
{ "Abstellkammer", NULL, NULL }
};
int num_fields = mysql_num_fields(result);
if (num_fields > 3) {
MYSQL_ROW row;
while ((row = mysql_fetch_row(result))) {
if (strlen(row[3]) > 4) row[3][4] = '\0'; // loose the secnod and third decimal ...
// data binding
for (int i = 0; i < 4; i++) {
if (strcmp(row[1], data[i].text) == 0) {
if (strcmp(row[2], "Temperatur") == 0 && data[i].temperature == NULL) data[i].temperature = row[3];
else if (strcmp(row[2], "Luftfeuchte") == 0 && data[i].humidity == NULL) data[i].humidity = row[3];
}
}
// debugging
//for(int i = 0; i < num_fields; i++) printf("%s ", row[i] ? row[i] : "NULL");
//printf("\n");
}
}
printf("Updating dashboard...\n");
for (int i = 0; i < 4; i++) {
color c = {255,125 + 25*i,25 + 25*i};
updateSlot(fbp, data[i], 15, 7 + slot_height * i, c);
}
printf("Done!\n");
mysql_free_result(result);
mysql_close(con);
}
void draw() {
clear_screen(fbp);
// horizontal spacersint x_space = 10; // horizontal spacersint x_space = 10;
int y_step_width = HEIGHT / 4;
for (int i = 1; i < 4; i++) { for (int i = 1; i < 4; i++) {
int x0 = 15; int x0 = 15;
int x1 = WIDTH - x0; int x1 = fb.width - x0;
int y = y_step_width * i; int y = slot_height * i;
int r = 225; int r = 225;
int g = 32; int g = 32;
int b = 32; int b = 32;
draw_line(fbp, x0, y-1, x1, y-1, r, g, b); draw_line(fb, x0, y-1, x1, y-1, r, g, b);
draw_line(fbp, x0, y , x1, y , r, g, b); draw_line(fb, x0, y , x1, y , r, g, b);
draw_line(fbp, x0, y+1, x1, y+1, r, g, b); draw_line(fb, x0, y+1, x1, y+1, r, g, b);
} }
// define what to display
sourcedata data[4] = {
// text | temperature | humidity
{ "Esszimmer" , NULL, NULL },
{ "Wohnzimmer" , NULL, NULL },
{ "Schlafzimmer" , NULL, NULL },
{ "Abstellkammer" , NULL, NULL }
};
// fetch data from database and update screen // fetch data from database and update screen
updateData(fbp, y_step_width); printf("Fetching data...\n");
updateData(data);
// update dashboard
printf("Updating dashboard...\n");
for (int i = 0; i < 4; i++) {
color c = {255,125 + 25*i,25 + 25*i};
updateSlot(fb, data[i], 15, 7 + slot_height * i, c);
// release allocated memory for values
free(data[i].temperature);
free(data[i].humidity);
}
} }
// application entry point // application entry point
int main(int argc, char* argv[]) int main(int argc, char* argv[]) {
{ char *fbp = 0;
int fbfd = 0; int fbfd = 0;
long int screensize = 0; long int screensize = 0;
// Open the framebuffer file for reading and writing // Open the framebuffer file for reading and writing
fbfd = open("/dev/fb1", O_RDWR); fbfd = open(DEVICE, O_RDWR);
if (fbfd == -1) { if (fbfd == -1) {
printf("Error: cannot open framebuffer device.\n"); printf("Error: cannot open framebuffer device.\n");
return(1); return(1);
@ -192,7 +110,7 @@ int main(int argc, char* argv[])
printf("The framebuffer device was opened successfully.\n"); printf("The framebuffer device was opened successfully.\n");
// map fb to user mem // map fb to user mem
screensize = WIDTH*HEIGHT*2; screensize = WIDTH * HEIGHT * (BITS_PER_PIXEL / 8);
fbp = (char*)mmap(0, fbp = (char*)mmap(0,
screensize, screensize,
PROT_READ | PROT_WRITE, PROT_READ | PROT_WRITE,
@ -200,12 +118,24 @@ int main(int argc, char* argv[])
fbfd, fbfd,
0); 0);
if ((int)fbp == -1) { if ((int)fbp == -1) {
printf("Failed to mmap.\n"); printf("Failed to mmap.\n");
} }
else { else {
// define the screen object
screen fb = {
.buffer = fbp,
.width = WIDTH,
.height = HEIGHT,
.bpp = BITS_PER_PIXEL,
.step = (BITS_PER_PIXEL / 8),
.line = (BITS_PER_PIXEL / 8) * WIDTH,
.screensize = screensize,
};
// draw... // draw...
draw(); draw(fb);
} }
// cleanup // cleanup

74
fbdata.c Normal file
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@ -0,0 +1,74 @@
#include "fbdata.h"
void finish_with_error(MYSQL *con) {
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
}
void updateData(sourcedata data[]) {
// query database for latest values
char query[] = "\
SELECT time, source, metric, value \
FROM readings AS r \
INNER JOIN (SELECT MAX(time) AS maxtime, source_id, metric_id FROM readings GROUP BY source_id,metric_id) AS mr \
ON mr.maxtime = r.time AND mr.source_id = r.source_id AND mr.metric_id = r.metric_id \
INNER JOIN sources AS s \
ON r.source_id = s.id \
INNER JOIN metrics AS m \
ON r.metric_id = m.id;\
";
printf("Connecting to database ...\n");
printf("MySQL client version: %s\n", mysql_get_client_info());
MYSQL *con;
if (!(con = mysql_init(NULL))) finish_with_error(con);
if (!mysql_real_connect(con, "web-pi", "grafanaReader", "grafanaReader", "grafanaData", 0, NULL, 0)) finish_with_error(con);
//printf("%s\n",query);
printf("Running query ...\n");
//printf("Query: %s\n", query);
if (mysql_query(con, query)) finish_with_error(con);
printf("Finished.\n");
MYSQL_RES *result;
if (!(result = mysql_store_result(con))) finish_with_error(con);
int num_fields = mysql_num_fields(result);
if (num_fields > 3) { // sanity check to honor bounds
MYSQL_ROW row;
while ((row = mysql_fetch_row(result))) {
unsigned long *length = mysql_fetch_lengths (result); // only valid for current row
int l = *(length + 3) - 2;
//printf("%s [l = %d]\n", row[3], l);
// data binding
for (int i = 0; i < 4; i++) {
if (strcmp(row[1], data[i].text) == 0) {
if (strcmp(row[2], "Temperatur") == 0 && data[i].temperature == NULL) {
data[i].temperature = calloc((l + 1),sizeof(char)); // +1 for null-termination
memcpy(data[i].temperature, row[3], l * sizeof(char));
}
else if (strcmp(row[2], "Luftfeuchte") == 0 && data[i].humidity == NULL){
data[i].humidity = calloc((l + 1),sizeof(char)); // +1 for null-termination
memcpy(data[i].humidity, row[3], l * sizeof(char));
}
}
}
// debugging
//for(int i = 0; i < num_fields; i++) printf("%s ", row[i] ? row[i] : "NULL");
//printf("\n");
}
}
// free memory after dashboard was updated
mysql_free_result(result);
mysql_close(con);
printf("Done!\n");
}

18
fbdata.h Normal file
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@ -0,0 +1,18 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mysql.h>
struct s_sourcedata {
char* text;
char* temperature;
char* humidity;
};
typedef struct s_sourcedata sourcedata;
void finish_with_error(MYSQL *con);
void updateData(sourcedata data[]);

210
fblib.c
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@ -1,136 +1,30 @@
/*
* fblib.c
*
* Adapted by Florian Klemenz for use in the fb_dash project
*
* Source and all credit goes to
* http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
*
* Original work by J-P Rosti (a.k.a -rst- and 'Raspberry Compote')
*
* Licensed under the Creative Commons Attribution 3.0 Unported License
* (http://creativecommons.org/licenses/by/3.0/deed.en_US)
*
* Distributed in the hope that this will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#include "fblib.h" #include "fblib.h"
// helper function to 'plot' a pixel in given color // helper function to 'plot' a pixel in given color
void put_pixel(char *fbp, int x, int y, int r, int g, int b) void put_pixel(screen fb, int x, int y, int r, int g, int b)
{ {
// calculate the pixel's byte offset inside the buffer // calculate the pixel's byte offset inside the buffer
// note: x * 2 as every pixel is 2 consecutive bytes // note: x * 2 as every pixel is 2 consecutive bytes
//unsigned int pix_offset = x * 2 + y * finfo.line_length; //unsigned int pix_offset = x * 2 + y * finfo.line_length;
unsigned int pix_offset = x * 2 + y * (WIDTH * 2); unsigned int pix_offset = x * fb.step + y * fb.line;
// now this is about the same as 'fbp[pix_offset] = value' // now this is about the same as 'fbp[pix_offset] = value'
// but a bit more complicated for RGB565 // but a bit more complicated for RGB565
//unsigned short c = ((r / 8) << 11) + ((g / 4) << 5) + (b / 8); //unsigned short c = ((r / 8) << 11) + ((g / 4) << 5) + (b / 8);
unsigned short c = ((r / 8) * 2048) + ((g / 4) * 32) + (b / 8); unsigned short c = ((r / 8) * 2048) + ((g / 4) * 32) + (b / 8);
// write 'two bytes at once' // write 'two bytes at once'
*((unsigned short*)(fbp + pix_offset)) = c; *((unsigned short*)(fb.buffer + pix_offset)) = c;
}
// helper function to draw a rectangle in given color
void fill_rect(char *fbp, int x, int y, int w, int h, int r, int g, int b) {
int cx, cy;
for (cy = 0; cy < h; cy++) {
for (cx = 0; cx < w; cx++) {
put_pixel(fbp, x + cx, y + cy, r, g, b);
}
}
}
// helper function to draw a rectangle outline in given color
void draw_rect(char *fbp, int x0, int y0, int w, int h, int r, int g, int b) {
draw_line(fbp, x0, y0, x0 + w, y0, r, g, b); // top
draw_line(fbp, x0, y0, x0, y0 + h, r, g, b); // left
draw_line(fbp, x0, y0 + h, x0 + w, y0 + h, r, g, b); // bottom
draw_line(fbp, x0 + w, y0, x0 + w, y0 + h, r, g, b); // right
}
// helper function to draw a circle outline in given color
// (uses Bresenham's circle algorithm)
void draw_circle(char *fbp, int x0, int y0, int radius, int r, int g, int b)
{
int x = radius;
int y = 0;
int radiusError = 1 - x;
while(x >= y)
{
// top left
put_pixel(fbp, -y + x0, -x + y0, r, g, b);
// top right
put_pixel(fbp, y + x0, -x + y0, r, g, b);
// upper middle left
put_pixel(fbp, -x + x0, -y + y0, r, g, b);
// upper middle right
put_pixel(fbp, x + x0, -y + y0, r, g, b);
// lower middle left
put_pixel(fbp, -x + x0, y + y0, r, g, b);
// lower middle right
put_pixel(fbp, x + x0, y + y0, r, g, b);
// bottom left
put_pixel(fbp, -y + x0, x + y0, r, g, b);
// bottom right
put_pixel(fbp, y + x0, x + y0, r, g, b);
y++;
if (radiusError < 0)
{
radiusError += 2 * y + 1;
} else {
x--;
radiusError+= 2 * (y - x + 1);
}
}
}
// helper function to draw a filled circle in given color
// (uses Bresenham's circle algorithm)
void fill_circle(char *fbp, int x0, int y0, int radius, int r, int g, int b) {
int x = radius;
int y = 0;
int radiusError = 1 - x;
while(x >= y)
{
// top
draw_line(fbp, -y + x0, -x + y0, y + x0, -x + y0, r, g, b);
// upper middle
draw_line(fbp, -x + x0, -y + y0, x + x0, -y + y0, r, g, b);
// lower middle
draw_line(fbp, -x + x0, y + y0, x + x0, y + y0, r, g, b);
// bottom
draw_line(fbp, -y + x0, x + y0, y + x0, x + y0, r, g, b);
y++;
if (radiusError < 0)
{
radiusError += 2 * y + 1;
} else {
x--;
radiusError+= 2 * (y - x + 1);
}
}
} }
// helper function to clear the screen - fill whole // helper function to clear the screen - fill whole
// screen with given color // screen with given color
void clear_screen(char *fbp) { void clear_screen(screen fb) {
//memset(fbp, 0, vinfo.xres * vinfo.yres * 2); // 16Bit = 8Bit * 2 memset(fb.buffer, 0, fb.screensize);
memset(fbp, 0, WIDTH * HEIGHT * 2); // 16Bit = 8Bit * 2
} }
// helper function to draw a line in given color // helper function to draw a line in given color
// (uses Bresenham's line algorithm) // (uses Bresenham's line algorithm)
void draw_line(char *fbp, int x0, int y0, int x1, int y1, int r, int g, int b) { void draw_line(screen fb, int x0, int y0, int x1, int y1, int r, int g, int b) {
int dx = x1 - x0; int dx = x1 - x0;
dx = (dx >= 0) ? dx : -dx; // abs() dx = (dx >= 0) ? dx : -dx; // abs()
int dy = y1 - y0; int dy = y1 - y0;
@ -149,7 +43,7 @@ void draw_line(char *fbp, int x0, int y0, int x1, int y1, int r, int g, int b) {
int e2; int e2;
int done = 0; int done = 0;
while (!done) { while (!done) {
put_pixel(fbp, x0, y0, r, g, b); put_pixel(fb, x0, y0, r, g, b);
if ((x0 == x1) && (y0 == y1)) if ((x0 == x1) && (y0 == y1))
done = 1; done = 1;
else { else {
@ -166,7 +60,93 @@ void draw_line(char *fbp, int x0, int y0, int x1, int y1, int r, int g, int b) {
} }
} }
void render_string(char *fbp, fbfont font, char *text, int x, int y, int r, int g, int b) // helper function to draw a rectangle in given color
void fill_rect(screen fb, int x, int y, int w, int h, int r, int g, int b) {
int cx, cy;
for (cy = 0; cy < h; cy++) {
for (cx = 0; cx < w; cx++) {
put_pixel(fb, x + cx, y + cy, r, g, b);
}
}
}
// helper function to draw a rectangle outline in given color
void draw_rect(screen fb, int x0, int y0, int w, int h, int r, int g, int b) {
draw_line(fb, x0, y0, x0 + w, y0, r, g, b); // top
draw_line(fb, x0, y0, x0, y0 + h, r, g, b); // left
draw_line(fb, x0, y0 + h, x0 + w, y0 + h, r, g, b); // bottom
draw_line(fb, x0 + w, y0, x0 + w, y0 + h, r, g, b); // right
}
// helper function to draw a circle outline in given color
// (uses Bresenham's circle algorithm)
void draw_circle(screen fb, int x0, int y0, int radius, int r, int g, int b)
{
int x = radius;
int y = 0;
int radiusError = 1 - x;
while(x >= y)
{
// top left
put_pixel(fb, -y + x0, -x + y0, r, g, b);
// top right
put_pixel(fb, y + x0, -x + y0, r, g, b);
// upper middle left
put_pixel(fb, -x + x0, -y + y0, r, g, b);
// upper middle right
put_pixel(fb, x + x0, -y + y0, r, g, b);
// lower middle left
put_pixel(fb, -x + x0, y + y0, r, g, b);
// lower middle right
put_pixel(fb, x + x0, y + y0, r, g, b);
// bottom left
put_pixel(fb, -y + x0, x + y0, r, g, b);
// bottom right
put_pixel(fb, y + x0, x + y0, r, g, b);
y++;
if (radiusError < 0)
{
radiusError += 2 * y + 1;
} else {
x--;
radiusError+= 2 * (y - x + 1);
}
}
}
// helper function to draw a filled circle in given color
// (uses Bresenham's circle algorithm)
void fill_circle(screen fb, int x0, int y0, int radius, int r, int g, int b) {
int x = radius;
int y = 0;
int radiusError = 1 - x;
while(x >= y)
{
// top
draw_line(fb, -y + x0, -x + y0, y + x0, -x + y0, r, g, b);
// upper middle
draw_line(fb, -x + x0, -y + y0, x + x0, -y + y0, r, g, b);
// lower middle
draw_line(fb, -x + x0, y + y0, x + x0, y + y0, r, g, b);
// bottom
draw_line(fb, -y + x0, x + y0, y + x0, x + y0, r, g, b);
y++;
if (radiusError < 0)
{
radiusError += 2 * y + 1;
} else {
x--;
radiusError+= 2 * (y - x + 1);
}
}
}
void render_string(screen fb, fbfont font, char *text, int x, int y, int r, int g, int b)
{ {
int text_length = strlen(text); int text_length = strlen(text);
//printf("text_length = %d\n", text_length); //printf("text_length = %d\n", text_length);
@ -199,7 +179,7 @@ void render_string(char *fbp, fbfont font, char *text, int x, int y, int r, int
//printf("x"); //printf("x");
int x_pos = x_offset + byte_num * 8 + bit_number; int x_pos = x_offset + byte_num * 8 + bit_number;
put_pixel(fbp, x_pos, y_pos, r, g, b); put_pixel(fb, x_pos, y_pos, r, g, b);
} }
else { else {
// leave empty (or maybe plot 'text backgr color') // leave empty (or maybe plot 'text backgr color')

53
fblib.h
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@ -1,23 +1,3 @@
/*
* fblib.h
*
* Adapted by Florian Klemenz for use in the fb_dash project
*
* Source and all credit goes to
* http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
*
* Original work by J-P Rosti (a.k.a -rst- and 'Raspberry Compote')
*
* Licensed under the Creative Commons Attribution 3.0 Unported License
* (http://creativecommons.org/licenses/by/3.0/deed.en_US)
*
* Distributed in the hope that this will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#ifndef FBLIB_H #ifndef FBLIB_H
#define FBLIB_H #define FBLIB_H
@ -31,18 +11,35 @@
#define WIDTH 240 #define WIDTH 240
#define HEIGHT 320 #define HEIGHT 320
struct s_color {
unsigned char r;
unsigned char g;
unsigned char b;
};
typedef struct s_color color;
void put_pixel(char *fbp, int x, int y, int r, int g, int b); struct s_screen {
void clear_screen(char *fbp); char *buffer;
unsigned int width;
unsigned int height;
unsigned char bpp; // bits per pixel
unsigned char step; // byte-wise step per pixel
unsigned int line; // line length
unsigned int screensize;
};
typedef struct s_screen screen;
void draw_line(char *fbp, int x0, int y0, int x1, int y1, int r, int g, int b); void put_pixel(screen fb, int x, int y, int r, int g, int b);
void clear_screen(screen fb);
void draw_rect(char *fbp, int x0, int y0, int w, int h, int r, int g, int b); void draw_line(screen fb, int x0, int y0, int x1, int y1, int r, int g, int b);
void fill_rect(char *fbp, int x, int y, int w, int h, int r, int g, int b);
void draw_circle(char *fbp, int x0, int y0, int radius, int r, int g, int b); void draw_rect(screen fb, int x0, int y0, int w, int h, int r, int g, int b);
void fill_circle(char *fbp, int x0, int y0, int radius, int r, int g, int b); void fill_rect(screen fb, int x, int y, int w, int h, int r, int g, int b);
void render_string(char *fbp, fbfont font, char *text, int x, int y, int r, int g, int b); void draw_circle(screen fb, int x0, int y0, int radius, int r, int g, int b);
void fill_circle(screen fb, int x0, int y0, int radius, int r, int g, int b);
void render_string(screen fb, fbfont font, char *text, int x, int y, int r, int g, int b);
#endif #endif