** Interface definition for Pikchr.
/* The main interface. Invoke this routine to translate PIKCHR source
** text into SVG. The SVG is returned in a buffer obtained from malloc().
** The caller is responsible for freeing the buffer.
** If an error occurs, *pnWidth is filled with a negative number and
** the return buffer contains error message text instead of SVG. By
** default, the error message is HTML encoded. However, error messages
** come out as plaintext if the PIKCHR_PLAINTEXT_ERRORS flag is included
** as one of the bits in the mFlags parameter.
const char *zText, /* Input PIKCHR source text. zero-terminated */
const char *zClass, /* Add class="%s" to <svg> markup */
unsigned int mFlags, /* Flags used to influence rendering behavior */
int *pnWidth, /* OUT: Write width of <svg> here, if not NULL */
int *pnHeight /* OUT: Write height here, if not NULL */
/* Include PIKCHR_PLAINTEXT_ERRORS among the bits of mFlags on the 3rd
** argument to pikchr() in order to cause error message text to come out
** as text/plain instead of as text/html
#define PIKCHR_PLAINTEXT_ERRORS 0x0001
/* Include PIKCHR_DARK_MODE among the bits of mFlags on the 3rd
** argument to pikchr() to render the image in dark mode.
#define PIKCHR_DARK_MODE 0x0002