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void dc_blot(unsigned long dest, unsigned long x, unsigned long y, unsigned long src);
void dc_copy(unsigned long dest, unsigned long x, unsigned long y, unsigned long src);
void dc_fill(unsigned long context, unsigned long color);
unsigned long dc_gr_dc_alias(long *width, long *height);
unsigned long dc_integer_scale(unsigned long context, long scale_factor, long *width, long *height);
unsigned long dc_load_from_file(const char * filename, long *width, long *height);
unsigned long dc_new(unsigned long width, unsigned long height);
unsigned long dc_replace_color(unsigned long context, unsigned long from, unsigned long to);