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Code Issues Releases Wiki Activity

font: add anti-aliasing and other features (#6198)

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* Pack glyph bits

* Use unsigned chars for unicode strings.

* Implement multi-bit glyphs

* clang-format

* Allow extra glyphs to be added to a font

* Allow .otf and .woff file extensions

* Add printf versions with background color;
Add tests

* Whitespace...

* Move font test to new framework

* CI fix

* CI fix

* CODEOWNERS

* File extensions tested as case-insensitive
This commit is contained in:
Clyde Stubbs
2024-03-11 20:03:39 +11:00
committed by GitHub
parent 11b31483c3
commit e4df422798
8 changed files with 282 additions and 113 deletions
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77
esphome/components/font/font.cpp
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@@ -10,29 +10,10 @@ namespace font {
static const char *const TAG = "font";
void Glyph::draw(int x_at, int y_start, display::Display *display, Color color) const {
int scan_x1, scan_y1, scan_width, scan_height;
this->scan_area(&scan_x1, &scan_y1, &scan_width, &scan_height);
const unsigned char *data = this->glyph_data_->data;
const int max_x = x_at + scan_x1 + scan_width;
const int max_y = y_start + scan_y1 + scan_height;
for (int glyph_y = y_start + scan_y1; glyph_y < max_y; glyph_y++) {
for (int glyph_x = x_at + scan_x1; glyph_x < max_x; data++, glyph_x += 8) {
uint8_t pixel_data = progmem_read_byte(data);
const int pixel_max_x = std::min(max_x, glyph_x + 8);
for (int pixel_x = glyph_x; pixel_x < pixel_max_x && pixel_data; pixel_x++, pixel_data <<= 1) {
if (pixel_data & 0x80) {
display->draw_pixel_at(pixel_x, glyph_y, color);
}
}
}
}
}
const char *Glyph::get_char() const { return this->glyph_data_->a_char; }
bool Glyph::compare_to(const char *str) const {
const uint8_t *Glyph::get_char() const { return this->glyph_data_->a_char; }
// Compare the char at the string position with this char.
// Return true if this char is less than or equal the other.
bool Glyph::compare_to(const uint8_t *str) const {
// 1 -> this->char_
// 2 -> str
for (uint32_t i = 0;; i++) {
@@ -48,7 +29,7 @@ bool Glyph::compare_to(const char *str) const {
// this should not happen
return false;
}
int Glyph::match_length(const char *str) const {
int Glyph::match_length(const uint8_t *str) const {
for (uint32_t i = 0;; i++) {
if (this->glyph_data_->a_char[i] == '\0')
return i;
@@ -65,12 +46,13 @@ void Glyph::scan_area(int *x1, int *y1, int *width, int *height) const {
*height = this->glyph_data_->height;
}
Font::Font(const GlyphData *data, int data_nr, int baseline, int height) : baseline_(baseline), height_(height) {
Font::Font(const GlyphData *data, int data_nr, int baseline, int height, uint8_t bpp)
: baseline_(baseline), height_(height), bpp_(bpp) {
glyphs_.reserve(data_nr);
for (int i = 0; i < data_nr; ++i)
glyphs_.emplace_back(&data[i]);
}
int Font::match_next_glyph(const char *str, int *match_length) {
int Font::match_next_glyph(const uint8_t *str, int *match_length) {
int lo = 0;
int hi = this->glyphs_.size() - 1;
while (lo != hi) {
@@ -95,7 +77,7 @@ void Font::measure(const char *str, int *width, int *x_offset, int *baseline, in
int x = 0;
while (str[i] != '\0') {
int match_length;
int glyph_n = this->match_next_glyph(str + i, &match_length);
int glyph_n = this->match_next_glyph((const uint8_t *) str + i, &match_length);
if (glyph_n < 0) {
// Unknown char, skip
if (!this->get_glyphs().empty())
@@ -118,12 +100,13 @@ void Font::measure(const char *str, int *width, int *x_offset, int *baseline, in
*x_offset = min_x;
*width = x - min_x;
}
void Font::print(int x_start, int y_start, display::Display *display, Color color, const char *text) {
void Font::print(int x_start, int y_start, display::Display *display, Color color, const char *text, Color background) {
int i = 0;
int x_at = x_start;
int scan_x1, scan_y1, scan_width, scan_height;
while (text[i] != '\0') {
int match_length;
int glyph_n = this->match_next_glyph(text + i, &match_length);
int glyph_n = this->match_next_glyph((const uint8_t *) text + i, &match_length);
if (glyph_n < 0) {
// Unknown char, skip
ESP_LOGW(TAG, "Encountered character without representation in font: '%c'", text[i]);
@@ -138,7 +121,41 @@ void Font::print(int x_start, int y_start, display::Display *display, Color colo
}
const Glyph &glyph = this->get_glyphs()[glyph_n];
glyph.draw(x_at, y_start, display, color);
glyph.scan_area(&scan_x1, &scan_y1, &scan_width, &scan_height);
const uint8_t *data = glyph.glyph_data_->data;
const int max_x = x_at + scan_x1 + scan_width;
const int max_y = y_start + scan_y1 + scan_height;
uint8_t bitmask = 0;
uint8_t pixel_data = 0;
float bpp_max = (1 << this->bpp_) - 1;
for (int glyph_y = y_start + scan_y1; glyph_y != max_y; glyph_y++) {
for (int glyph_x = x_at + scan_x1; glyph_x != max_x; glyph_x++) {
uint8_t pixel = 0;
for (int bit_num = 0; bit_num != this->bpp_; bit_num++) {
if (bitmask == 0) {
pixel_data = progmem_read_byte(data++);
bitmask = 0x80;
}
pixel <<= 1;
if ((pixel_data & bitmask) != 0)
pixel |= 1;
bitmask >>= 1;
}
if (pixel == bpp_max) {
display->draw_pixel_at(glyph_x, glyph_y, color);
} else if (pixel != 0) {
float on = (float) pixel / bpp_max;
float off = 1.0 - on;
Color blended;
blended.r = color.r * on + background.r * off;
blended.g = color.r * on + background.g * off;
blended.b = color.r * on + background.b * off;
display->draw_pixel_at(glyph_x, glyph_y, blended);
}
}
}
x_at += glyph.glyph_data_->width + glyph.glyph_data_->offset_x;
i += match_length;