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video: truetype: Support newlines in the measured string

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It is useful to be able to embed newline characters in the string and
have the text measured into multiple lines. Add support for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-04-02 06:29:38 +13:00
committed by Tom Rini
parent a7bbc59c31
commit 030e53aaaa
3 changed files with 48 additions and 7 deletions
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25
drivers/video/console_truetype.c
View File

@@ -771,10 +771,33 @@ static int truetype_measure(struct udevice *dev, const char *name, uint size,
neww += stbtt_GetCodepointKernAdvance(font, lastch, ch);
lastch = ch;
/* see if we need to start a new line */
if (ch == '\n') {
mline.bbox.x0 = 0;
mline.bbox.y0 = bbox->y1;
mline.bbox.x1 = tt_ceil((double)width * met->scale);
bbox->y1 += met->font_size;
mline.bbox.y1 = bbox->y1;
mline.bbox.valid = true;
mline.start = start;
mline.len = (s - text) - start;
if (lines && !alist_add(lines, mline))
return log_msg_ret("ttm", -ENOMEM);
log_debug("line x1 %d y0 %d y1 %d start %d len %d text '%.*s'\n",
mline.bbox.x1, mline.bbox.y0, mline.bbox.y1,
mline.start, mline.len, mline.len, text + mline.start);
start = s - text;
if (ch == '\n')
start++;
lastch = 0;
neww = 0;
}
width = neww;
}
/* add the line */
/* add the final line */
mline.bbox.x0 = 0;
mline.bbox.y0 = bbox->y1;
mline.bbox.x1 = tt_ceil((double)width * met->scale);

4
include/video_console.h
View File

@@ -244,6 +244,8 @@ struct vidconsole_ops {
/**
* measure() - Measure the bounding box of some text
*
* The text can include newlines
*
* @dev: Console device to use
* @name: Font name to use (NULL to use default)
* @size: Font size to use (0 to use default)
@@ -342,6 +344,8 @@ int vidconsole_select_font(struct udevice *dev, const char *name, uint size);
/**
* vidconsole_measure() - Measure the bounding box of some text
*
* The text can include newlines
*
* @dev: Device to adjust
* @name: Font name to use (NULL to use default)
* @size: Font size to use (0 to use default)

26
test/dm/video.c
View File

@@ -781,7 +781,7 @@ DM_TEST(dm_test_video_damage, UTF_SCAN_PDATA | UTF_SCAN_FDT);
/* Test font measurement */
static int dm_test_font_measure(struct unit_test_state *uts)
{
const char *test_string = "There is always much to be said for not "
const char *test_string = "There is always much\nto be said for not "
"attempting more than you can do and for making a certainty of "
"what you try. But this principle, like others in life and "
"war, has its exceptions.";
@@ -790,6 +790,7 @@ static int dm_test_font_measure(struct unit_test_state *uts)
struct video_priv *priv;
struct udevice *dev, *con;
struct alist lines;
int nl;
ut_assertok(uclass_get_device(UCLASS_VIDEO, 0, &dev));
priv = dev_get_uclass_priv(dev);
@@ -804,18 +805,31 @@ static int dm_test_font_measure(struct unit_test_state *uts)
&lines));
ut_asserteq(0, bbox.x0);
ut_asserteq(0, bbox.y0);
ut_asserteq(0x47a, bbox.x1);
ut_asserteq(0x12, bbox.y1);
ut_asserteq(1, lines.count);
ut_asserteq(0x3ea, bbox.x1);
ut_asserteq(0x24, bbox.y1);
ut_asserteq(2, lines.count);
nl = strchr(test_string, '\n') - test_string;
line = alist_get(&lines, 0, struct vidconsole_mline);
ut_assertnonnull(line);
ut_asserteq(0, line->bbox.x0);
ut_asserteq(0, line->bbox.y0);
ut_asserteq(0x47a, line->bbox.x1);
ut_asserteq(0x8c, line->bbox.x1);
ut_asserteq(0x12, line->bbox.y1);
ut_asserteq(0, line->start);
ut_asserteq(strlen(test_string), line->len);
ut_asserteq(20, line->len);
ut_asserteq(nl, line->len);
line++;
ut_asserteq(0x0, line->bbox.x0);
ut_asserteq(0x12, line->bbox.y0);
ut_asserteq(0x3ea, line->bbox.x1);
ut_asserteq(0x24, line->bbox.y1);
ut_asserteq(21, line->start);
ut_asserteq(nl + 1, line->start);
ut_asserteq(163, line->len);
ut_asserteq(strlen(test_string + nl + 1), line->len);
return 0;
}