* [kbd] [PATCHv3 1/3] VT: Add height parameter to con_font_get/set consw operations
2023-01-19 15:19 [kbd] [PATCHv3 0/3] VT: Support >32x32 fonts for hidpi displays Samuel Thibault
@ 2023-01-19 15:19 ` Samuel Thibault
2023-01-19 15:19 ` [kbd] [PATCHv3 2/3] VT: Add KD_FONT_OP_SET/GET_TALL operations Samuel Thibault
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Samuel Thibault @ 2023-01-19 15:19 UTC (permalink / raw)
To: Greg Kroah-Hartman, Jiri Slaby, kbd
Cc: linux-kernel@vger.kernel.org, Samuel Thibault, linux-kernel
The current con_font_get/set API currently hardcodes a 32-pixel-tall
limitation, which only dates from the old VGA hardware which could not
handle taller fonts than that.
This change just adds a vpitch parameter to release this
constraint. Drivers which do not support vpitch != 32 can just return
EINVAL when it is not 32, font loading tools will revert to trying 32
and succeed.
This change makes the fbcon driver consider vpitch appropriately, thus
making it able to load large fonts.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
V1 -> V3: Drop (bogus) sisusb_con.c change, it was phased out
Index: linux-6.0/drivers/tty/vt/vt.c
===================================================================
--- linux-6.0.orig/drivers/tty/vt/vt.c
+++ linux-6.0/drivers/tty/vt/vt.c
@@ -4604,7 +4604,7 @@ static int con_font_get(struct vc_data *
if (vc->vc_mode != KD_TEXT)
rc = -EINVAL;
else if (vc->vc_sw->con_font_get)
- rc = vc->vc_sw->con_font_get(vc, &font);
+ rc = vc->vc_sw->con_font_get(vc, &font, 32);
else
rc = -ENOSYS;
console_unlock();
@@ -4665,7 +4665,7 @@ static int con_font_set(struct vc_data *
else if (vc->vc_sw->con_font_set) {
if (vc_is_sel(vc))
clear_selection();
- rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
+ rc = vc->vc_sw->con_font_set(vc, &font, 32, op->flags);
} else
rc = -ENOSYS;
console_unlock();
Index: linux-6.0/drivers/video/console/vgacon.c
===================================================================
--- linux-6.0.orig/drivers/video/console/vgacon.c
+++ linux-6.0/drivers/video/console/vgacon.c
@@ -1029,7 +1029,7 @@ static int vgacon_adjust_height(struct v
}
static int vgacon_font_set(struct vc_data *c, struct console_font *font,
- unsigned int flags)
+ unsigned int vpitch, unsigned int flags)
{
unsigned charcount = font->charcount;
int rc;
@@ -1037,7 +1037,7 @@ static int vgacon_font_set(struct vc_dat
if (vga_video_type < VIDEO_TYPE_EGAM)
return -EINVAL;
- if (font->width != VGA_FONTWIDTH ||
+ if (font->width != VGA_FONTWIDTH || vpitch != 32 ||
(charcount != 256 && charcount != 512))
return -EINVAL;
@@ -1050,9 +1050,9 @@ static int vgacon_font_set(struct vc_dat
return rc;
}
-static int vgacon_font_get(struct vc_data *c, struct console_font *font)
+static int vgacon_font_get(struct vc_data *c, struct console_font *font, unsigned int vpitch)
{
- if (vga_video_type < VIDEO_TYPE_EGAM)
+ if (vga_video_type < VIDEO_TYPE_EGAM || vpitch != 32)
return -EINVAL;
font->width = VGA_FONTWIDTH;
Index: linux-6.0/drivers/video/fbdev/core/fbcon.c
===================================================================
--- linux-6.0.orig/drivers/video/fbdev/core/fbcon.c
+++ linux-6.0/drivers/video/fbdev/core/fbcon.c
@@ -2271,7 +2271,7 @@ static int fbcon_debug_leave(struct vc_d
return 0;
}
-static int fbcon_get_font(struct vc_data *vc, struct console_font *font)
+static int fbcon_get_font(struct vc_data *vc, struct console_font *font, unsigned int vpitch)
{
u8 *fontdata = vc->vc_font.data;
u8 *data = font->data;
@@ -2290,8 +2290,8 @@ static int fbcon_get_font(struct vc_data
for (i = 0; i < font->charcount; i++) {
memcpy(data, fontdata, j);
- memset(data + j, 0, 32 - j);
- data += 32;
+ memset(data + j, 0, vpitch - j);
+ data += vpitch;
fontdata += j;
}
} else if (font->width <= 16) {
@@ -2301,8 +2301,8 @@ static int fbcon_get_font(struct vc_data
for (i = 0; i < font->charcount; i++) {
memcpy(data, fontdata, j);
- memset(data + j, 0, 64 - j);
- data += 64;
+ memset(data + j, 0, 2*vpitch - j);
+ data += 2*vpitch;
fontdata += j;
}
} else if (font->width <= 24) {
@@ -2316,8 +2316,8 @@ static int fbcon_get_font(struct vc_data
*data++ = fontdata[2];
fontdata += sizeof(u32);
}
- memset(data, 0, 3 * (32 - j));
- data += 3 * (32 - j);
+ memset(data, 0, 3 * (vpitch - j));
+ data += 3 * (vpitch - j);
}
} else {
j = vc->vc_font.height * 4;
@@ -2326,8 +2326,8 @@ static int fbcon_get_font(struct vc_data
for (i = 0; i < font->charcount; i++) {
memcpy(data, fontdata, j);
- memset(data + j, 0, 128 - j);
- data += 128;
+ memset(data + j, 0, 4 * vpitch - j);
+ data += 4 * vpitch;
fontdata += j;
}
}
@@ -2461,19 +2461,12 @@ err_out:
}
/*
- * User asked to set font; we are guaranteed that
- * a) width and height are in range 1..32
- * b) charcount does not exceed 512
- * but lets not assume that, since someone might someday want to use larger
- * fonts. And charcount of 512 is small for unicode support.
- *
- * However, user space gives the font in 32 rows , regardless of
- * actual font height. So a new API is needed if support for larger fonts
- * is ever implemented.
+ * User asked to set font; we are guaranteed that charcount does not exceed 512
+ * but lets not assume that, since charcount of 512 is small for unicode support.
*/
static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
- unsigned int flags)
+ unsigned int vpitch, unsigned int flags)
{
struct fb_info *info = fbcon_info_from_console(vc->vc_num);
unsigned charcount = font->charcount;
@@ -2516,7 +2509,7 @@ static int fbcon_set_font(struct vc_data
FNTSIZE(new_data) = size;
REFCOUNT(new_data) = 0; /* usage counter */
for (i=0; i< charcount; i++) {
- memcpy(new_data + i*h*pitch, data + i*32*pitch, h*pitch);
+ memcpy(new_data + i*h*pitch, data + i*vpitch*pitch, h*pitch);
}
/* Since linux has a nice crc32 function use it for counting font
Index: linux-6.0/include/linux/console.h
===================================================================
--- linux-6.0.orig/include/linux/console.h
+++ linux-6.0/include/linux/console.h
@@ -58,8 +58,9 @@ struct consw {
int (*con_switch)(struct vc_data *vc);
int (*con_blank)(struct vc_data *vc, int blank, int mode_switch);
int (*con_font_set)(struct vc_data *vc, struct console_font *font,
- unsigned int flags);
- int (*con_font_get)(struct vc_data *vc, struct console_font *font);
+ unsigned int vpitch, unsigned int flags);
+ int (*con_font_get)(struct vc_data *vc, struct console_font *font,
+ unsigned int vpitch);
int (*con_font_default)(struct vc_data *vc,
struct console_font *font, char *name);
int (*con_resize)(struct vc_data *vc, unsigned int width,
Index: linux-6.0/drivers/video/console/newport_con.c
===================================================================
--- linux-6.0.orig/drivers/video/console/newport_con.c
+++ linux-6.0/drivers/video/console/newport_con.c
@@ -497,7 +497,7 @@ static int newport_blank(struct vc_data
return 1;
}
-static int newport_set_font(int unit, struct console_font *op)
+static int newport_set_font(int unit, struct console_font *op, unsigned int vpitch)
{
int w = op->width;
int h = op->height;
@@ -507,7 +507,7 @@ static int newport_set_font(int unit, st
/* ladis: when I grow up, there will be a day... and more sizes will
* be supported ;-) */
- if ((w != 8) || (h != 16)
+ if ((w != 8) || (h != 16) || (vpitch != 32)
|| (op->charcount != 256 && op->charcount != 512))
return -EINVAL;
@@ -569,9 +569,10 @@ static int newport_font_default(struct v
return newport_set_def_font(vc->vc_num, op);
}
-static int newport_font_set(struct vc_data *vc, struct console_font *font, unsigned flags)
+static int newport_font_set(struct vc_data *vc, struct console_font *font,
+ unsigned int vpitch, unsigned int flags)
{
- return newport_set_font(vc->vc_num, font);
+ return newport_set_font(vc->vc_num, font, vpitch);
}
static bool newport_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
Index: linux-6.0/drivers/video/console/sticon.c
===================================================================
--- linux-6.0.orig/drivers/video/console/sticon.c
+++ linux-6.0/drivers/video/console/sticon.c
@@ -169,7 +169,8 @@ static int sticon_set_def_font(int unit,
return 0;
}
-static int sticon_set_font(struct vc_data *vc, struct console_font *op)
+static int sticon_set_font(struct vc_data *vc, struct console_font *op,
+ unsigned int vpitch)
{
struct sti_struct *sti = sticon_sti;
int vc_cols, vc_rows, vc_old_cols, vc_old_rows;
@@ -181,7 +182,7 @@ static int sticon_set_font(struct vc_dat
struct sti_cooked_font *cooked_font;
unsigned char *data = op->data, *p;
- if ((w < 6) || (h < 6) || (w > 32) || (h > 32)
+ if ((w < 6) || (h < 6) || (w > 32) || (h > 32) || (vpitch != 32)
|| (op->charcount != 256 && op->charcount != 512))
return -EINVAL;
pitch = ALIGN(w, 8) / 8;
@@ -267,9 +268,9 @@ static int sticon_font_default(struct vc
}
static int sticon_font_set(struct vc_data *vc, struct console_font *font,
- unsigned int flags)
+ unsigned int vpitch, unsigned int flags)
{
- return sticon_set_font(vc, font);
+ return sticon_set_font(vc, font, vpitch);
}
static void sticon_init(struct vc_data *c, int init)
^ permalink raw reply [flat|nested] 5+ messages in thread* [kbd] [PATCHv3 2/3] VT: Add KD_FONT_OP_SET/GET_TALL operations
2023-01-19 15:19 [kbd] [PATCHv3 0/3] VT: Support >32x32 fonts for hidpi displays Samuel Thibault
2023-01-19 15:19 ` [kbd] [PATCHv3 1/3] VT: Add height parameter to con_font_get/set consw operations Samuel Thibault
@ 2023-01-19 15:19 ` Samuel Thibault
2023-01-19 15:19 ` [kbd] [PATCHv3 3/3] VT: Bump font size limitation to 64x128 pixels Samuel Thibault
2023-01-19 15:23 ` [kbd] [PATCHv3 0/3] VT: Support >32x32 fonts for hidpi displays Greg Kroah-Hartman
3 siblings, 0 replies; 5+ messages in thread
From: Samuel Thibault @ 2023-01-19 15:19 UTC (permalink / raw)
To: Greg Kroah-Hartman, Jiri Slaby, kbd
Cc: linux-kernel@vger.kernel.org, Samuel Thibault, linux-kernel
The KD_FONT_OP_SET/GET operations hardcode vpitch to be 32 pixels,
which only dates from the old VGA hardware which as asserting this.
Drivers such as fbcon however do not have such limitation, so this
introduces KD_FONT_OP_SET/GET_TALL operations, which userland can try
to use to avoid this limitation, thus opening the patch to >32 pixels
font height.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Index: linux-6.0/drivers/tty/vt/vt.c
===================================================================
--- linux-6.0.orig/drivers/tty/vt/vt.c
+++ linux-6.0/drivers/tty/vt/vt.c
@@ -4592,6 +4592,7 @@ static int con_font_get(struct vc_data *
struct console_font font;
int rc = -EINVAL;
int c;
+ unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
if (op->data) {
font.data = kmalloc(max_font_size, GFP_KERNEL);
@@ -4604,7 +4605,7 @@ static int con_font_get(struct vc_data *
if (vc->vc_mode != KD_TEXT)
rc = -EINVAL;
else if (vc->vc_sw->con_font_get)
- rc = vc->vc_sw->con_font_get(vc, &font, 32);
+ rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
else
rc = -ENOSYS;
console_unlock();
@@ -4612,7 +4613,7 @@ static int con_font_get(struct vc_data *
if (rc)
goto out;
- c = (font.width+7)/8 * 32 * font.charcount;
+ c = (font.width+7)/8 * vpitch * font.charcount;
if (op->data && font.charcount > op->charcount)
rc = -ENOSPC;
@@ -4638,6 +4639,7 @@ static int con_font_set(struct vc_data *
struct console_font font;
int rc = -EINVAL;
int size;
+ unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
@@ -4647,7 +4649,9 @@ static int con_font_set(struct vc_data *
return -EINVAL;
if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
return -EINVAL;
- size = (op->width+7)/8 * 32 * op->charcount;
+ if (vpitch < op->height)
+ return -EINVAL;
+ size = (op->width+7)/8 * vpitch * op->charcount;
if (size > max_font_size)
return -ENOSPC;
@@ -4665,7 +4669,7 @@ static int con_font_set(struct vc_data *
else if (vc->vc_sw->con_font_set) {
if (vc_is_sel(vc))
clear_selection();
- rc = vc->vc_sw->con_font_set(vc, &font, 32, op->flags);
+ rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
} else
rc = -ENOSYS;
console_unlock();
@@ -4711,8 +4715,10 @@ int con_font_op(struct vc_data *vc, stru
{
switch (op->op) {
case KD_FONT_OP_SET:
+ case KD_FONT_OP_SET_TALL:
return con_font_set(vc, op);
case KD_FONT_OP_GET:
+ case KD_FONT_OP_GET_TALL:
return con_font_get(vc, op);
case KD_FONT_OP_SET_DEFAULT:
return con_font_default(vc, op);
Index: linux-6.0/include/uapi/linux/kd.h
===================================================================
--- linux-6.0.orig/include/uapi/linux/kd.h
+++ linux-6.0/include/uapi/linux/kd.h
@@ -161,19 +161,25 @@ struct console_font_op {
unsigned int flags; /* KD_FONT_FLAG_* */
unsigned int width, height; /* font size */
unsigned int charcount;
- unsigned char __user *data; /* font data with height fixed to 32 */
+ unsigned char __user *data; /* font data with vpitch fixed to 32 for
+ * KD_FONT_OP_SET/GET
+ */
};
struct console_font {
unsigned int width, height; /* font size */
unsigned int charcount;
- unsigned char *data; /* font data with height fixed to 32 */
+ unsigned char *data; /* font data with vpitch fixed to 32 for
+ * KD_FONT_OP_SET/GET
+ */
};
#define KD_FONT_OP_SET 0 /* Set font */
#define KD_FONT_OP_GET 1 /* Get font */
#define KD_FONT_OP_SET_DEFAULT 2 /* Set font to default, data points to name / NULL */
#define KD_FONT_OP_COPY 3 /* Obsolete, do not use */
+#define KD_FONT_OP_SET_TALL 4 /* Set font with vpitch = height */
+#define KD_FONT_OP_GET_TALL 5 /* Get font with vpitch = height */
#define KD_FONT_FLAG_DONT_RECALC 1 /* Don't recalculate hw charcell size [compat] */
^ permalink raw reply [flat|nested] 5+ messages in thread