Add a V4 Picopixel message font trial with longer previews

src/helpers/ui/SSD1306Display.cpp

@@ -1,5 +1,16 @@
 #include "SSD1306Display.h"
 
+#if defined(UI_SSD1306_PICOPIXEL_MESSAGES) && UI_SSD1306_PICOPIXEL_MESSAGES == 1
+#include <Fonts/Picopixel.h>
+#include "DisplayTextLayout.h"
+
+// The message UI has already replaced unsupported UTF-8 with CP437 blocks.
+// Picopixel is ASCII-only; retain a visible placeholder for those characters.
+static uint8_t picopixelCharacter(uint8_t c) {
+  return c >= 0x20 && c <= 0x7E ? c : '?';
+}
+#endif
+
 bool SSD1306Display::i2c_probe(TwoWire& wire, uint8_t addr) {
   wire.beginTransmission(addr);
   uint8_t error = wire.endTransmission();
@@ -112,13 +123,43 @@ void SSD1306Display::setColor(ColorVal c) {
 }
 
 void SSD1306Display::setCursor(int x, int y) {
+#if defined(UI_SSD1306_PICOPIXEL_MESSAGES) && UI_SSD1306_PICOPIXEL_MESSAGES == 1
+  // GFX custom fonts take a baseline; the shared UI takes a top coordinate.
+  if (_picopixel_message) y += 4;
+#endif
   display.setCursor(x, y);
 }
 
 void SSD1306Display::print(const char* str) {
+#if defined(UI_SSD1306_PICOPIXEL_MESSAGES) && UI_SSD1306_PICOPIXEL_MESSAGES == 1
+  if (_picopixel_message) {
+    while (*str) display.write(picopixelCharacter((uint8_t)*str++));
+    return;
+  }
+#endif
   display.print(str);
 }
 
+#if defined(UI_SSD1306_PICOPIXEL_MESSAGES) && UI_SSD1306_PICOPIXEL_MESSAGES == 1
+void SSD1306Display::printWordWrap(const char* str, int max_width) {
+  const int x = display.getCursorX();
+  const int y = display.getCursorY();
+  if (max_width > width() - x) max_width = width() - x;
+  // Capitals are 5px high; descenders can use a sixth pixel. Leave one blank
+  // row between lines and never start a partially visible final line.
+  const int max_lines = (height() - y + 1) / 7;
+  display.setFont(&Picopixel);
+  display.setTextSize(1);
+  display.setTextWrap(false);
+  _picopixel_message = true;
+  mesh::ui::drawTextWrapped(*this, x, y, max_width, 7, max_lines, str);
+  _picopixel_message = false;
+  display.setFont(nullptr);
+  display.setTextWrap(true);
+  display.setCursor(x, y);
+}
+#endif
+
 void SSD1306Display::fillRect(int x, int y, int w, int h) {
   display.fillRect(x, y, w, h, _color);
 }
@@ -132,6 +173,17 @@ void SSD1306Display::drawXbm(int x, int y, const uint8_t* bits, int w, int h) {
 }
 
 uint16_t SSD1306Display::getTextWidth(const char* str) {
+#if defined(UI_SSD1306_PICOPIXEL_MESSAGES) && UI_SSD1306_PICOPIXEL_MESSAGES == 1
+  if (_picopixel_message) {
+    // Include advances for spaces; GFX's ink bounds omit trailing whitespace.
+    uint16_t width = 0;
+    while (*str) {
+      const uint8_t c = picopixelCharacter((uint8_t)*str++);
+      width += pgm_read_byte(&PicopixelGlyphs[c - 0x20].xAdvance);
+    }
+    return width;
+  }
+#endif
   int16_t x1, y1;
   uint16_t w, h;
   display.getTextBounds(str, 0, 0, &x1, &y1, &w, &h);