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video: Use fractional units for X coordinates

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With anti-aliased fonts we need a more fine-grained horizontal position
than a single pixel. Characters can be positioned to start part-way through
a pixel, with anti-aliasing (greyscale edges) taking care of the visual
effect.

To cope with this, use fractional units (1/256 pixel) for horizontal
positions in the text console.

Signed-off-by: Simon Glass <sjg@chromium.org>
[agust: rebased]
Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Simon Glass
2016-01-14 18:10:37 -07:00
committed by Anatolij Gustschin
parent 6e42e25196
commit f266178698
5 changed files with 137 additions and 53 deletions
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40
include/video_console.h
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@@ -7,21 +7,37 @@
#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
*/
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;
};
/**
@@ -36,12 +52,15 @@ 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
@@ -75,10 +94,13 @@ 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);