Some help in application selector example

Altera_Forum · ‎02-19-2010

Hi,

Can anyone explain this function to me (I mean explaining each statment in this function and how does it work)

Note : This function is included in the app_selector_gui.c in the appication selector example which works on the Nios II embededd Cyclone III edition .

int AsPrerenderFont( unsigned char* rendered_letters[],

struct abc_font_struct font[],

int fg_color,

int bg_color )

{

int i;

// We're going to use the video library functions to render this, and

// since those functions expect an alt_video_display type to which to write,

// we create a small temporary one here and fill it out just enough to draw

// to it.

alt_video_display* temp_buffer;

temp_buffer = (alt_video_display*) malloc(sizeof (alt_video_display));

temp_buffer->color_depth = 32;

temp_buffer->num_frame_buffers = 1;

temp_buffer->bytes_per_pixel = ( 4 );

temp_buffer->buffer_being_written = 0;

temp_buffer->buffer_ptrs[0] = (alt_video_frame*) malloc( sizeof( alt_video_frame ));

for( i = 0; i < 94; i++ )

{

temp_buffer->width = font.bounds_width ;

temp_buffer->height = font.bounds_height;

temp_buffer->bytes_per_frame = (( temp_buffer->width * temp_buffer->height ) * 4 );

temp_buffer->buffer_ptrs[0]->buffer = (void*) malloc( temp_buffer->bytes_per_frame );

vid_print_char_alpha ( 0, 0, fg_color, i + 33, bg_color, font, temp_buffer );

rendered_letters[i] = temp_buffer->buffer_ptrs[0]->buffer;

}

free( temp_buffer->buffer_ptrs[0] );

free( temp_buffer );

return( 0 );

}