* @y_charsize: Character height in pixels
* @tab_width_frac: Tab width in fractional units
* @xsize_frac: Width of the display in fractional units
+ * @xstart_frac: Left margin for the text console in fractional units
+ * @last_ch: Last character written to the text console on this line
+ * @escape: TRUE if currently accumulating an ANSI escape sequence
+ * @escape_len: Length of accumulated escape sequence so far
+ * @escape_buf: Buffer to accumulate escape sequence
*/
struct vidconsole_priv {
struct stdio_dev sdev;
int y_charsize;
int tab_width_frac;
int xsize_frac;
+ int xstart_frac;
+ int last_ch;
+ /*
+ * ANSI escape sequences are accumulated character by character,
+ * starting after the ESC char (0x1b) until the entire sequence
+ * is consumed at which point it is acted upon.
+ */
+ int escape;
+ int escape_len;
+ char escape_buf[32];
};
/**
* @return 0 if OK, -ve on error
*/
int (*set_row)(struct udevice *dev, uint row, int clr);
+
+ /**
+ * entry_start() - Indicate that text entry is starting afresh
+ *
+ * Consoles which use proportional fonts need to track the position of
+ * each character output so that backspace will return to the correct
+ * place. This method signals to the console driver that a new entry
+ * line is being start (e.g. the user pressed return to start a new
+ * command). The driver can use this signal to empty its list of
+ * positions.
+ */
+ int (*entry_start)(struct udevice *dev);
+
+ /**
+ * backspace() - Handle erasing the last character
+ *
+ * With proportional fonts the vidconsole uclass cannot itself erase
+ * the previous character. This optional method will be called when
+ * a backspace is needed. The driver should erase the previous
+ * character and update the cursor position (xcur_frac, ycur) to the
+ * start of the previous character.
+ *
+ * If not implement, default behaviour will work for fixed-width
+ * characters.
+ */
+ int (*backspace)(struct udevice *dev);
};
/* Get a pointer to the driver operations for a video console device */