static bool nsfont_position_in_string(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_Glyph glyph;
int prev_x = 0;
*actual_x = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
*actual_x += glyph->advance.x >> 16;
if (*actual_x > x)
break;
prev_x = *actual_x;
nxtchr = utf8_next(string, length, nxtchr);
}
/* choose nearest of previous and last x */
if (abs(*actual_x - x) > abs(prev_x - x))
*actual_x = prev_x;
*char_offset = nxtchr;
return true;
}
static bool
framebuffer_plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_Glyph glyph;
FT_BitmapGlyph bglyph;
nsfb_bbox_t loc;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(text + nxtchr, length - nxtchr);
nxtchr = utf8_next(text, length, nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
if (glyph->format == FT_GLYPH_FORMAT_BITMAP) {
bglyph = (FT_BitmapGlyph)glyph;
loc.x0 = x + bglyph->left;
loc.y0 = y - bglyph->top;
loc.x1 = loc.x0 + bglyph->bitmap.width;
loc.y1 = loc.y0 + bglyph->bitmap.rows;
/* now, draw to our target surface */
if (bglyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO) {
nsfb_plot_glyph1(nsfb,
&loc,
bglyph->bitmap.buffer,
bglyph->bitmap.pitch,
fstyle->foreground);
} else {
nsfb_plot_glyph8(nsfb,
&loc,
bglyph->bitmap.buffer,
bglyph->bitmap.pitch,
fstyle->foreground);
}
}
x += glyph->advance.x >> 16;
}
return true;
}
static bool nsfont_split(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
uint32_t ucs4;
size_t nxtchr = 0;
int last_space_x = 0;
int last_space_idx = 0;
FT_Glyph glyph;
*actual_x = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
if (ucs4 == 0x20) {
last_space_x = *actual_x;
last_space_idx = nxtchr;
}
*actual_x += glyph->advance.x >> 16;
if (*actual_x > x) {
/* string has exceeded available width return previous
* space
*/
*actual_x = last_space_x;
*char_offset = last_space_idx;
return true;
}
nxtchr = utf8_next(string, length, nxtchr);
}
*char_offset = nxtchr;
return true;
}
/**
* Measure the width of a string.
*
* \param fstyle style for this text
* \param string UTF-8 string to measure
* \param length length of string
* \param width updated to width of string[0..length)
* \return true on success, false on error and error reported
*/
static bool nsfont_width(const plot_font_style_t *fstyle,
const char *string, size_t length,
int *width)
{
uint32_t ucs4;
size_t nxtchr = 0;
FT_Glyph glyph;
*width = 0;
while (nxtchr < length) {
ucs4 = utf8_to_ucs4(string + nxtchr, length - nxtchr);
nxtchr = utf8_next(string, length, nxtchr);
glyph = fb_getglyph(fstyle, ucs4);
if (glyph == NULL)
continue;
*width += glyph->advance.x >> 16;
}
return true;
}
