154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* fbdash.c
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*
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* Adapted by Florian Klemenz for use in the fb_dash project
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*
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* Source and all credit goes to
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* http://raspberrycompote.blogspot.com/
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* --------------------------------------------------------------------------------------------
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*
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* http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
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*
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* Original work by J-P Rosti (a.k.a -rst- and 'Raspberry Compote')
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*
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* Licensed under the Creative Commons Attribution 3.0 Unported License
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* (http://creativecommons.org/licenses/by/3.0/deed.en_US)
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*
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* Distributed in the hope that this will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include "fblib.h"
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#include "fbfonts.h"
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// 'global' variables to store screen info
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char *fbp = 0;
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struct fb_var_screeninfo vinfo;
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struct fb_fix_screeninfo finfo;
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#define FONTW 8
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#define FONTH 8
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// helper function for drawing - no more need to go mess with
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// the main function when just want to change what to draw...
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void draw() {
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clear_screen(fbp);
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// horizontal spacersint x_space = 10;
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int y_step_width = vinfo.yres / 4;
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for (int i = 1; i < 4; i++) {
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int x0 = 15;
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int x1 = vinfo.xres - x0;
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int y = y_step_width * i;
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int r = 200;
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int g = 32;
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int b = 32;
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draw_line(fbp, x0, y-1, x1, y-1, r, g, b);
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draw_line(fbp, x0, y , x1, y , r, g, b);
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draw_line(fbp, x0, y+1, x1, y+1, r, g, b);
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}
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char *text = "HUHU!";
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int text_length = strlen(text);
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int i, x, y;
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// see https://www.geeksforgeeks.org/pointer-array-array-pointer/
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//char *fontImg = font8x8_basic;
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for (i = 0; i < text_length; i++) { // each character
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int ix = text[i];
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//printf("%c --> %d\n", text[i], ix);
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char *img = font8x8_basic[ix];
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// loop through pixel rows (8 rows with 8 pixels/bits or 1 bytes each)
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for (y = 0; y < FONTH; y++) { // each line
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// loop through pixel/bit columns
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char row = img[y];
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for (x = 0; x < FONTW; x++) { // each column
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unsigned char mask = 1 << x;
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if(row & mask) {
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printf("x");
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// plot the pixel
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put_pixel(fbp, i * FONTW + x, y, 255, 255, 255);
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}
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else {
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printf(" ");
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// leave empty (or maybe plot 'text backgr color')
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}
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} // end "for x"
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printf("\n");
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} // end "for y"
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} // end "for i"
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}
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// application entry point
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int main(int argc, char* argv[])
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{
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int fbfd = 0;
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//struct fb_var_screeninfo orig_vinfo;
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long int screensize = 0;
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// Open the framebuffer file for reading and writing
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fbfd = open("/dev/fb1", O_RDWR);
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if (fbfd == -1) {
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printf("Error: cannot open framebuffer device.\n");
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return(1);
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}
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printf("The framebuffer device was opened successfully.\n");
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// Get variable screen information
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if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
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printf("Error reading variable information.\n");
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}
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printf("Variable info: %dx%d, %dbpp\n",
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vinfo.xres, vinfo.yres,
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vinfo.bits_per_pixel );
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// Get fixed screen information
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if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
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printf("Error reading fixed information.\n");
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}
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printf("Fixed info: smem_len %d, line_length %d\n", finfo.smem_len, finfo.line_length);
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// map fb to user mem
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screensize = finfo.smem_len;
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fbp = (char*)mmap(0,
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screensize,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fbfd,
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0);
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if ((int)fbp == -1) {
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printf("Failed to mmap.\n");
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}
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else {
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// draw...
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draw();
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}
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// cleanup
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//clear_screen(fbp);
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// unmap fb file from memory
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munmap(fbp, screensize);
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// close fb file
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close(fbfd);
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return 0;
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}
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