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[fbcon] Allow for an arbitrary margin around the text area

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-01-22 13:57:07 +00:00
parent 7fc380e950
commit 608d6cac9e
4 changed files with 41 additions and 15 deletions
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41
src/core/fbcon.c
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@@ -573,6 +573,7 @@ static int fbcon_picture_init ( struct fbcon *fbcon,
* @v fbcon Frame buffer console
* @v start Start address
* @v pixel Pixel geometry
* @v margin Minimum margin
* @v map Colour mapping
* @v font Font definition
* @v pixbuf Background picture (if any)
@@ -580,9 +581,12 @@ static int fbcon_picture_init ( struct fbcon *fbcon,
*/
int fbcon_init ( struct fbcon *fbcon, userptr_t start,
struct fbcon_geometry *pixel,
struct fbcon_margin *margin,
struct fbcon_colour_map *map,
struct fbcon_font *font,
struct pixel_buffer *pixbuf ) {
int width;
int height;
unsigned int xgap;
unsigned int ygap;
int rc;
@@ -603,21 +607,31 @@ int fbcon_init ( struct fbcon *fbcon, userptr_t start,
user_to_phys ( fbcon->start, 0 ),
user_to_phys ( fbcon->start, fbcon->len ) );
/* Derive character geometry from pixel geometry */
fbcon->character.width = ( pixel->width / FBCON_CHAR_WIDTH );
fbcon->character.height = ( pixel->height / FBCON_CHAR_HEIGHT );
fbcon->character.len = ( pixel->len * FBCON_CHAR_WIDTH );
fbcon->character.stride = ( pixel->stride * FBCON_CHAR_HEIGHT );
/* Calculate margin */
xgap = ( pixel->width % FBCON_CHAR_WIDTH );
ygap = ( pixel->height % FBCON_CHAR_HEIGHT );
fbcon->margin.left = ( xgap / 2 );
fbcon->margin.top = ( ygap / 2 );
fbcon->margin.right = ( xgap - fbcon->margin.left );
fbcon->margin.bottom = ( ygap - fbcon->margin.top );
/* Expand margin to accommodate whole characters */
width = ( pixel->width - margin->left - margin->right );
height = ( pixel->height - margin->top - margin->bottom );
if ( ( width < FBCON_CHAR_WIDTH ) || ( height < FBCON_CHAR_HEIGHT ) ) {
DBGC ( fbcon, "FBCON %p has unusable character area "
"[%d-%d),[%d-%d)\n", fbcon,
margin->left, ( pixel->width - margin->right ),
margin->top, ( pixel->height - margin->bottom ) );
rc = -EINVAL;
goto err_margin;
}
xgap = ( width % FBCON_CHAR_WIDTH );
ygap = ( height % FBCON_CHAR_HEIGHT );
fbcon->margin.left = ( margin->left + ( xgap / 2 ) );
fbcon->margin.top = ( margin->top + ( ygap / 2 ) );
fbcon->margin.right = ( margin->right + ( xgap - ( xgap / 2 ) ) );
fbcon->margin.bottom = ( margin->bottom + ( ygap - ( ygap / 2 ) ) );
fbcon->indent = ( ( fbcon->margin.top * pixel->stride ) +
( fbcon->margin.left * pixel->len ) );
/* Derive character geometry from pixel geometry */
fbcon->character.width = ( width / FBCON_CHAR_WIDTH );
fbcon->character.height = ( height / FBCON_CHAR_HEIGHT );
fbcon->character.len = ( pixel->len * FBCON_CHAR_WIDTH );
fbcon->character.stride = ( pixel->stride * FBCON_CHAR_HEIGHT );
DBGC ( fbcon, "FBCON %p is pixel %dx%d, char %dx%d at "
"[%d-%d),[%d-%d)\n", fbcon, fbcon->pixel->width,
fbcon->pixel->height, fbcon->character.width,
@@ -662,6 +676,7 @@ int fbcon_init ( struct fbcon *fbcon, userptr_t start,
err_picture:
ufree ( fbcon->text.start );
err_text:
err_margin:
return rc;
}