21 static unsigned char *put_2(
unsigned char *p, 
unsigned int n)
    29 static unsigned char *put_4(
unsigned char *p, 
unsigned int n)
    41 static void make_bmp_header(
unsigned char *p)
    74     memset(header, 0, 
sizeof(header));
    75     make_bmp_header(header);
    76     fwrite(header, 
sizeof(header), 1, output);
    79         for (x = 0; x < 
png.
width; x++, p++) {
    85             fputc((
unsigned char)b, output);
    86             fputc((
unsigned char)g, output);
    87             fputc((
unsigned char)r, output);
    88             fputc((
unsigned char)a, output);
 void void void void G_fatal_error(const char *,...) __attribute__((format(printf
GRASS png display driver - header file. 
void png_get_pixel(unsigned int pixel, int *r, int *g, int *b, int *a)
void output(const char *fmt,...)