From 43b2d6c59aaac0aa17b81043b641149105a0315d Mon Sep 17 00:00:00 2001
From: EliteTK <tomasz.kramkowski@gmail.com>
Date: Tue, 25 Feb 2014 16:18:35 +0000
Subject: Working on framebuffer graphics.

---
 fbcopy.c      | 21 +++++++++++++++++++
 framebuffer.c | 43 ++++++++++++++++++++++++++++++--------
 sofbcode.c    | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+), 8 deletions(-)
 create mode 100644 fbcopy.c
 create mode 100644 sofbcode.c

diff --git a/fbcopy.c b/fbcopy.c
new file mode 100644
index 0000000..bc4e078
--- /dev/null
+++ b/fbcopy.c
@@ -0,0 +1,21 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<time.h>
+
+int main(void) {
+    FILE *fbp = fopen( "/dev/fb0", "r" );
+    if (!fbp)
+        exit(1);
+    puts("Opened framebuffer for reading.");
+    FILE *outfile = fopen( "/home/main/c-stuff/fbshot", "w" );
+    if (!outfile)
+        exit(1);
+    puts("Opened outfile for writing.");
+    char c;
+    while ( (c = fgetc(fbp)) != EOF )
+        fputc(c, outfile);
+    puts("Finished writing to files. Closing.");
+    fclose(fbp);
+    fclose(outfile);
+    puts("Finished.");
+}
diff --git a/framebuffer.c b/framebuffer.c
index 9902fa1..665b833 100644
--- a/framebuffer.c
+++ b/framebuffer.c
@@ -1,14 +1,41 @@
 #include<stdio.h>
 #include<stdlib.h>
 
+#define SSIZE 3145728
+#define INFILE "/home/main/c-stuff/fbshot"
+
 int main( void ) {
-    printf("Here goes nothing!");
-    getchar();
-    FILE *fbp = fopen( "/dev/fb0", "w");
-    int i;
-    for( i = 0; i < 1044480; i++ )
-        fputc(i, fbp);
-    fclose( fbp );
-}
+    FILE *fbp = fopen( "/dev/fb0", "w" );
+    if (!fbp) {
+        puts("Failed to open /dev/fb0");
+        exit(1);
+    }
 
+    FILE *infile = fopen( INFILE, "r" );
+    if (!infile) {
+        printf("Failed to open %s\n", INFILE);
+        exit(1);
+    }
 
+    int i, ii, iii;
+    for ( iii = 0; iii < 768 / 2; iii++ ) {
+        for ( i = 0; i < 1024; i++ ) {
+            fputc(0, fbp);
+            fputc(255, fbp);
+            fputc(0, fbp);
+            fputc(255, fbp);
+        }
+        for ( i = 0; i < 1024; i++ ) {
+            for ( ii = 0; ii < 4; ii++ )
+                fputc(0, fbp);
+        }
+    }
+
+    /*
+    char c;
+    while((c = fgetc(infile)) != EOF)
+        fputc(c, fbp);
+    */
+    fclose( fbp );
+    fclose( infile );
+}
diff --git a/sofbcode.c b/sofbcode.c
new file mode 100644
index 0000000..e4b9d3d
--- /dev/null
+++ b/sofbcode.c
@@ -0,0 +1,66 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <linux/fb.h>
+#include <sys/mman.h>
+
+int main()
+{
+        int fbfd = 0;
+        struct fb_var_screeninfo vinfo;
+        struct fb_fix_screeninfo finfo;
+        long int screensize = 0;
+         char *fbp = 0;
+        int x = 0, y = 0;
+        long int location = 0;
+        int count ;
+
+        /* Open the file for reading and writing */
+        fbfd = open("/dev/fb0", O_RDWR);
+        if (!fbfd) {
+                printf("Error: cannot open framebuffer device.\n");
+                exit(1);
+        }
+        printf("The framebuffer device was opened successfully.\n");
+     /* Get fixed screen information */
+        if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
+               printf("Error reading fixed information.\n");
+                exit(2);
+        }
+
+        /* Get variable screen information */
+        if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) {
+                printf("Error reading variable information.\n");
+                exit(3);
+        }
+
+        /* Figure out the size of the screen in bytes */
+        screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
+        printf("\nScreen size is %d",screensize);
+        printf("\nVinfo.bpp = %d",vinfo.bits_per_pixel);
+
+        /* Map the device to memory */
+        fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,fbfd, 0);
+        if ((int)fbp == -1) {
+                printf("Error: failed to map framebuffer device to memory.\n");
+                exit(4);
+        }
+         printf("The framebuffer device was mapped to memory successfully.\n");
+
+
+        x = 100; y = 100; /* Where we are going to put the pixel */
+
+        /* Figure out where in memory to put the pixel */
+        location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) + (y+vinfo.yoffset) * finfo.line_length;
+        for(count = 1 ;count < 100 ;count++)
+        {
+                *(fbp + location) = 255;    /* Some blue */
+                *(fbp + location + count) = 0; /* A little green */
+                *(fbp + location + count + 1) = 0; /* A lot of red */
+                *(fbp + location + count + 2) = 0; /* No transparency */
+        }
+        munmap(fbp, screensize);
+        close(fbfd);
+        return 0;
+}
-- 
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