X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=include%2Fvideo_console.h;h=26047934da8c59b4646caa6cb9f8a631d1ce0561;hb=d3bafe32ca47bc3872837c1fe7874f9913de103f;hp=c0fc79273a5b41be2a6d7d39eaca6e2b64eed9d8;hpb=82d72a1b9967cff4908f22c57536c3660f794401;p=oweals%2Fu-boot.git

diff --git a/include/video_console.h b/include/video_console.h
index c0fc79273a..26047934da 100644
--- a/include/video_console.h
+++ b/include/video_console.h
@@ -7,21 +7,41 @@
 #ifndef __video_console_h
 #define __video_console_h
 
+#define VID_FRAC_DIV	256
+
+#define VID_TO_PIXEL(x)	((x) / VID_FRAC_DIV)
+#define VID_TO_POS(x)	((x) * VID_FRAC_DIV)
+
 /**
  * struct vidconsole_priv - uclass-private data about a console device
  *
+ * Drivers must set up @rows, @cols, @x_charsize, @y_charsize in their probe()
+ * method. Drivers may set up @xstart_frac if desired.
+ *
  * @sdev:	stdio device, acting as an output sink
- * @curr_col:	Current text column (0=left)
- * @curr_row:	Current row (0=top)
+ * @xcur_frac:	Current X position, in fractional units (VID_TO_POS(x))
+ * @curr_row:	Current Y position in pixels (0=top)
  * @rows:	Number of text rows
  * @cols:	Number of text columns
+ * @x_charsize:	Character width in pixels
+ * @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
  */
 struct vidconsole_priv {
 	struct stdio_dev sdev;
-	int curr_col;
-	int curr_row;
+	int xcur_frac;
+	int ycur;
 	int rows;
 	int cols;
+	int x_charsize;
+	int y_charsize;
+	int tab_width_frac;
+	int xsize_frac;
+	int xstart_frac;
+	int last_ch;
 };
 
 /**
@@ -36,12 +56,15 @@ struct vidconsole_ops {
 	 * putc_xy() - write a single character to a position
 	 *
 	 * @dev:	Device to write to
-	 * @x:		Pixel X position (0=left-most pixel)
+	 * @x_frac:	Fractional pixel X position (0=left-most pixel) which
+	 *		is the X position multipled by VID_FRAC_DIV.
 	 * @y:		Pixel Y position (0=top-most pixel)
 	 * @ch:		Character to write
-	 * @return 0 if OK, -ve on error
+	 * @return number of fractional pixels that the cursor should move,
+	 * if all is OK, -EAGAIN if we ran out of space on this line, other -ve
+	 * on error
 	 */
-	int (*putc_xy)(struct udevice *dev, uint x, uint y, char ch);
+	int (*putc_xy)(struct udevice *dev, uint x_frac, uint y, char ch);
 
 	/**
 	 * move_rows() - Move text rows from one place to another
@@ -66,6 +89,32 @@ struct vidconsole_ops {
 	 * @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 */
@@ -75,10 +124,13 @@ struct vidconsole_ops {
  * vidconsole_putc_xy() - write a single character to a position
  *
  * @dev:	Device to write to
- * @x:		Pixel X position (0=left-most pixel)
+ * @x_frac:	Fractional pixel X position (0=left-most pixel) which
+ *		is the X position multipled by VID_FRAC_DIV.
  * @y:		Pixel Y position (0=top-most pixel)
  * @ch:		Character to write
- * @return 0 if OK, -ve on error
+ * @return number of fractional pixels that the cursor should move,
+ * if all is OK, -EAGAIN if we ran out of space on this line, other -ve
+ * on error
  */
 int vidconsole_putc_xy(struct udevice *dev, uint x, uint y, char ch);