video: Allow saving and restoring text-entry state
Text entry operates within a context which includes quite a bit of
information. For example, with Truetype fonts, each character in the
text string has a position stored, so that it is possible to
backspace to that character. This information is built up as strings
are drawn on the display.
For the command line, there is just a single context. It is created
when command-line entry starts and it is destroyed (or at least not
needed anymore) when the user presses <enter> to enter the command.
By contrast, expo needs to be able to switch in and out of a text-entry
context, since it is also displaying other objects in the scene.
Add a way to save and restore the entry context for a vidconsole. This
is only needed for the truetype vidconsole, so add a method for that,
storing the information in an abuf struct.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/console_truetype.c b/drivers/video/console_truetype.c
index 8ed79c3..1ce01a9 100644
--- a/drivers/video/console_truetype.c
+++ b/drivers/video/console_truetype.c
@@ -4,6 +4,7 @@
*/
#include <common.h>
+#include <abuf.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
@@ -175,6 +176,17 @@
int pos_ptr;
};
+/**
+ * struct console_tt_store - Format used for save/restore of entry information
+ *
+ * @priv: Private data
+ * @cur: Current cursor position
+ */
+struct console_tt_store {
+ struct console_tt_priv priv;
+ struct pos_info cur;
+};
+
static int console_truetype_set_row(struct udevice *dev, uint row, int clr)
{
struct video_priv *vid_priv = dev_get_uclass_priv(dev->parent);
@@ -780,6 +792,45 @@
return 0;
}
+static int truetype_entry_save(struct udevice *dev, struct abuf *buf)
+{
+ struct vidconsole_priv *vc_priv = dev_get_uclass_priv(dev);
+ struct console_tt_priv *priv = dev_get_priv(dev);
+ struct console_tt_store store;
+ const uint size = sizeof(store);
+
+ /*
+ * store the whole priv structure as it is simpler that picking out
+ * what we need
+ */
+ if (!abuf_realloc(buf, size))
+ return log_msg_ret("sav", -ENOMEM);
+
+ store.priv = *priv;
+ store.cur.xpos_frac = vc_priv->xcur_frac;
+ store.cur.ypos = vc_priv->ycur;
+ memcpy(abuf_data(buf), &store, size);
+
+ return 0;
+}
+
+static int truetype_entry_restore(struct udevice *dev, struct abuf *buf)
+{
+ struct vidconsole_priv *vc_priv = dev_get_uclass_priv(dev);
+ struct console_tt_priv *priv = dev_get_priv(dev);
+ struct console_tt_store store;
+
+ memcpy(&store, abuf_data(buf), sizeof(store));
+
+ vc_priv->xcur_frac = store.cur.xpos_frac;
+ vc_priv->ycur = store.cur.ypos;
+ priv->pos_ptr = store.priv.pos_ptr;
+ memcpy(priv->pos, store.priv.pos,
+ store.priv.pos_ptr * sizeof(struct pos_info));
+
+ return 0;
+}
+
const char *console_truetype_get_font_size(struct udevice *dev, uint *sizep)
{
struct console_tt_priv *priv = dev_get_priv(dev);
@@ -833,6 +884,8 @@
.select_font = truetype_select_font,
.measure = truetype_measure,
.nominal = truetype_nominal,
+ .entry_save = truetype_entry_save,
+ .entry_restore = truetype_entry_restore,
};
U_BOOT_DRIVER(vidconsole_truetype) = {
diff --git a/drivers/video/vidconsole-uclass.c b/drivers/video/vidconsole-uclass.c
index 23b1b81..07427ba 100644
--- a/drivers/video/vidconsole-uclass.c
+++ b/drivers/video/vidconsole-uclass.c
@@ -10,6 +10,7 @@
#define LOG_CATEGORY UCLASS_VIDEO_CONSOLE
#include <common.h>
+#include <abuf.h>
#include <command.h>
#include <console.h>
#include <log.h>
@@ -640,6 +641,37 @@
return 0;
}
+int vidconsole_entry_save(struct udevice *dev, struct abuf *buf)
+{
+ struct vidconsole_ops *ops = vidconsole_get_ops(dev);
+ int ret;
+
+ if (ops->measure) {
+ ret = ops->entry_save(dev, buf);
+ if (ret != -ENOSYS)
+ return ret;
+ }
+
+ /* no data so make sure the buffer is empty */
+ abuf_realloc(buf, 0);
+
+ return 0;
+}
+
+int vidconsole_entry_restore(struct udevice *dev, struct abuf *buf)
+{
+ struct vidconsole_ops *ops = vidconsole_get_ops(dev);
+ int ret;
+
+ if (ops->measure) {
+ ret = ops->entry_restore(dev, buf);
+ if (ret != -ENOSYS)
+ return ret;
+ }
+
+ return 0;
+}
+
void vidconsole_push_colour(struct udevice *dev, enum colour_idx fg,
enum colour_idx bg, struct vidconsole_colour *old)
{