Framebuffer vertices, draw lines, draw polygon, draw circles, and draw parabolic Functions

Framebuffer draws points, draw lines, draw polygon, draw circles, and draw parabolic functions-Linux general technology-Linux programming and kernel information. For more information, see the following. # Include
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# Define TRUE 1
# Define FALSE 0
# Define MIN (x, y) (x)> (y )? (Y) :( x ))
# Define MAX (x, y) (x)> (y )? (X) :( y ))
Typedef struct fbdev {
Int fb;
Unsigned long fb_mem_offset;
Unsigned long fb_mem;
Struct fb_fix_screeninfo fb_fix;
Struct fb_var_screeninfo fb_var;
Char dev [20];
} FBDEV, * PFBDEV;
Typedef struct point {
Int x;
Int y;
Int z;
} POINT, * PPOINT;
/* These math function Writed
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Void draw_dot (PFBDEV pFbdev, POINT p, uint8_t r, uint8_t g, uint8_t B );
Void draw_line (PFBDEV pFbdev, POINT p1, POINT p2, uint8_t r, uint8_t g, uint8_t B );
Void draw_polygon (PFBDEV pFbdev, uint32_t num, PPOINT array, uint8_t r, uint8_t g, uint8_t B );
Void draw_triangle (PFBDEV pFbdev, POINT p1, POINT p2, POINT p3, uint8_t r, uint8_t g, uint8_t B );
Void draw_circle (PFBDEV pFbdev, POINT center, uint32_t radius, uint8_t r, uint8_t g, uint8_t B );
Void draw_parabla_x (PFBDEV pFbdev, POINT center, int a, uint8_t r, uint8_t g, uint8_t B );
Void draw_parabla_y (PFBDEV pFbdev, POINT center, int a, uint8_t r, uint8_t g, uint8_t B );
Int fb_open (PFBDEV pFbdev)
{
PFbdev-> fb = open (pFbdev-> dev, O_RDWR );
If (pFbdev-> fb dev );
Return FALSE;
}
If (-1 = ioctl (pFbdev-> fb, FBIOGET_VSCREENINFO, & (pFbdev-> fb_var )))
{
Printf ("ioctl FBIOGET_VSCREENINFO \ n ");
Return FALSE;
}
If (-1 = ioctl (pFbdev-> fb, FBIOGET_FSCREENINFO, & (pFbdev-> fb_fix )))
{
Printf ("ioctl FBIOGET_FSCREENINFO \ n ");
Return FALSE;
}
PFbdev-> fb_mem_offset = (unsigned long) (pFbdev-> fb_fix.smem_start )&(~ PAGE_MASK );
PFbdev-> fb_mem = (unsigned long int) mmap (NULL, pFbdev-> fb_fix.smem_len +
PFbdev-> fb_mem_offset,
PROT_READ | PROT_WRITE, MAP_SHARED, pFbdev-> fb, 0 );
If (-1L = (long) pFbdev-> fb_mem)
{
Printf ("mmap error! Mem: % ld offset: % ld \ n ", pFbdev-> fb_mem,
PFbdev-> fb_mem_offset );
Return FALSE;
}
/*
Printf ("depth (bits per pixel) = % d \ n", fb. fb_var.bits_per_pixel );
Printf ("smemlen = % d \ n", fb. fb_fix.smem_len );
Printf ("fix_line (in byte) = % d \ n", fb. fb_fix.line_length );
*/
Return TRUE;
}
Void fb_close (PFBDEV pFbdev)
{
Close (pFbdev-> fb );
PFbdev-> fb =-1;
}
Void fb_memcpy (void * addr, void * color, size_t len)
{
Memcpy (addr, color, len );
}
Void draw_dot (PFBDEV pFbdev, POINT p, uint8_t r, uint8_t g, uint8_t B)
{
Uint32_t offset;
Uint8_t color [4];
Color [0] = B;
Color [1] = g;
Color [2] = r;
Color [3] = 0x0;
Offset = p. y * pFbdev-> fb_fix.line_length + 4 * p. x;
Fb_memcpy (void *) (pFbdev-> fb_mem + pFbdev-> fb_mem_offset + offset), color, 4 );
}
Void draw_line (PFBDEV pFbdev, POINT p1, POINT p2, uint8_t r, uint8_t g, uint8_t B)
{
POINT p;
Int x, y;
For (x = MIN (p1.x, p2.x); x = 0; I --)
{
Draw_circle (& fb, center, I, 0xff, 0xff, 0x0 );
}
*/
Center. x = 700;
Center. y = 250;
Int a =-100;
Draw_parabla_x (& fb, center, a, 0x0, 0xff, 0x0 );
Draw_parabla_x (& fb, center,-a, 0x0, 0xff, 0x0 );
Draw_parabla_y (& fb, center, a, 0x0, 0xff, 0x0 );
Draw_parabla_y (& fb, center,-a, 0x0, 0xff, 0x0 );
Fb_close (& fb );
Return 0;
}