Split display_buffer sub-components into own files (#4950)

* Split display_buffer sub-components into own files

Move the Image, Animation and Font classes to their own h/cpp pairs,
instead of having everything into the display_buffer h/cpp files.

* Fixed COLOR_ON duplicate definition

esphome/components/display/font.cpp

@@ -0,0 +1,105 @@
+#include "font.h"
+
+#include "esphome/core/hal.h"
+
+namespace esphome {
+namespace display {
+
+bool Glyph::get_pixel(int x, int y) const {
+  const int x_data = x - this->glyph_data_->offset_x;
+  const int y_data = y - this->glyph_data_->offset_y;
+  if (x_data < 0 || x_data >= this->glyph_data_->width || y_data < 0 || y_data >= this->glyph_data_->height)
+    return false;
+  const uint32_t width_8 = ((this->glyph_data_->width + 7u) / 8u) * 8u;
+  const uint32_t pos = x_data + y_data * width_8;
+  return progmem_read_byte(this->glyph_data_->data + (pos / 8u)) & (0x80 >> (pos % 8u));
+}
+const char *Glyph::get_char() const { return this->glyph_data_->a_char; }
+bool Glyph::compare_to(const char *str) const {
+  // 1 -> this->char_
+  // 2 -> str
+  for (uint32_t i = 0;; i++) {
+    if (this->glyph_data_->a_char[i] == '\0')
+      return true;
+    if (str[i] == '\0')
+      return false;
+    if (this->glyph_data_->a_char[i] > str[i])
+      return false;
+    if (this->glyph_data_->a_char[i] < str[i])
+      return true;
+  }
+  // this should not happen
+  return false;
+}
+int Glyph::match_length(const char *str) const {
+  for (uint32_t i = 0;; i++) {
+    if (this->glyph_data_->a_char[i] == '\0')
+      return i;
+    if (str[i] != this->glyph_data_->a_char[i])
+      return 0;
+  }
+  // this should not happen
+  return 0;
+}
+void Glyph::scan_area(int *x1, int *y1, int *width, int *height) const {
+  *x1 = this->glyph_data_->offset_x;
+  *y1 = this->glyph_data_->offset_y;
+  *width = this->glyph_data_->width;
+  *height = this->glyph_data_->height;
+}
+int Font::match_next_glyph(const char *str, int *match_length) {
+  int lo = 0;
+  int hi = this->glyphs_.size() - 1;
+  while (lo != hi) {
+    int mid = (lo + hi + 1) / 2;
+    if (this->glyphs_[mid].compare_to(str)) {
+      lo = mid;
+    } else {
+      hi = mid - 1;
+    }
+  }
+  *match_length = this->glyphs_[lo].match_length(str);
+  if (*match_length <= 0)
+    return -1;
+  return lo;
+}
+void Font::measure(const char *str, int *width, int *x_offset, int *baseline, int *height) {
+  *baseline = this->baseline_;
+  *height = this->height_;
+  int i = 0;
+  int min_x = 0;
+  bool has_char = false;
+  int x = 0;
+  while (str[i] != '\0') {
+    int match_length;
+    int glyph_n = this->match_next_glyph(str + i, &match_length);
+    if (glyph_n < 0) {
+      // Unknown char, skip
+      if (!this->get_glyphs().empty())
+        x += this->get_glyphs()[0].glyph_data_->width;
+      i++;
+      continue;
+    }
+
+    const Glyph &glyph = this->glyphs_[glyph_n];
+    if (!has_char) {
+      min_x = glyph.glyph_data_->offset_x;
+    } else {
+      min_x = std::min(min_x, x + glyph.glyph_data_->offset_x);
+    }
+    x += glyph.glyph_data_->width + glyph.glyph_data_->offset_x;
+
+    i += match_length;
+    has_char = true;
+  }
+  *x_offset = min_x;
+  *width = x - min_x;
+}
+Font::Font(const GlyphData *data, int data_nr, int baseline, int height) : baseline_(baseline), height_(height) {
+  glyphs_.reserve(data_nr);
+  for (int i = 0; i < data_nr; ++i)
+    glyphs_.emplace_back(&data[i]);
+}
+
+}  // namespace display
+}  // namespace esphome