2 files changed, 102 insertions, 0 deletions
diff --git a/src/Components/Gfx/Gfx.cpp b/src/Components/Gfx/Gfx.cpp
new file mode 100644
index 00000000..e948c6c9
--- /dev/null
+++ b/src/Components/Gfx/Gfx.cpp
@@ -0,0 +1,76 @@
+#include <libraries/svc/nrf_svci.h>
+#include "Gfx.h"
+#include "../../drivers/St7789.h"
+using namespace Pinetime::Components;
+
+Gfx::Gfx(Pinetime::Drivers::St7789 &lcd) : lcd{lcd} {
+  lcd.Init();
+}
+
+void Gfx::ClearScreen() {
+  lcd.FillRectangle(0, 0, width, height, 0xffff);
+}
+
+void Gfx::DrawString(uint8_t x, uint8_t y, uint16_t color, const char *text, const FONT_INFO *p_font, bool wrap) {
+  if (y > (height - p_font->height)) {
+    // Not enough space to write even single char.
+    return;
+  }
+
+  uint8_t current_x = x;
+  uint8_t current_y = y;
+
+  for (size_t i = 0; text[i] != '\0'; i++) {
+    if (text[i] == '\n') {
+      current_x = x;
+      current_y += p_font->height + p_font->height / 10;
+    } else {
+      DrawChar(p_font, (uint8_t) text[i], &current_x, current_y, color);
+    }
+
+    uint8_t char_idx = text[i] - p_font->startChar;
+    uint16_t char_width = text[i] == ' ' ? (p_font->height / 2) : p_font->charInfo[char_idx].widthBits;
+
+    if (current_x > (width - char_width)) {
+      if (wrap) {
+        current_x = x;
+        current_y += p_font->height + p_font->height / 10;
+      } else {
+        break;
+      }
+
+      if (y > (height - p_font->height)) {
+        break;
+      }
+    }
+  }
+}
+
+void Gfx::DrawChar(const FONT_INFO *font, uint8_t c, uint8_t *x, uint8_t y, uint16_t color) {
+  uint8_t char_idx = c - font->startChar;
+  uint16_t bytes_in_line = CEIL_DIV(font->charInfo[char_idx].widthBits, 8);
+
+  if (c == ' ') {
+    *x += font->height / 2;
+    return;
+  }
+
+  for (uint16_t i = 0; i < font->height; i++) {
+    for (uint16_t j = 0; j < bytes_in_line; j++) {
+      for (uint8_t k = 0; k < 8; k++) {
+        if ((1 << (7 - k)) &
+            font->data[font->charInfo[char_idx].offset + i * bytes_in_line + j]) {
+          pixel_draw(*x + j * 8 + k, y + i, color);
+        }
+      }
+    }
+  }
+
+  *x += font->charInfo[char_idx].widthBits + font->spacePixels;
+}
+
+void Gfx::pixel_draw(uint8_t x, uint8_t y, uint16_t color) {
+  lcd.DrawPixel(x, y, color);
+}
+
+
diff --git a/src/Components/Gfx/Gfx.h b/src/Components/Gfx/Gfx.h
new file mode 100644
index 00000000..72293de9
--- /dev/null
+++ b/src/Components/Gfx/Gfx.h
@@ -0,0 +1,26 @@
+#pragma once
+#include <cstdint>
+#include <nrf_font.h>
+
+
+namespace Pinetime {
+  namespace Drivers {
+    class St7789;
+  }
+  namespace Components {
+    class Gfx {
+      public:
+        explicit Gfx(Drivers::St7789& lcd);
+        void ClearScreen();
+        void DrawString(uint8_t x, uint8_t y, uint16_t color, const char* text, const FONT_INFO *p_font, bool wrap);
+        void DrawChar(const FONT_INFO *font, uint8_t c, uint8_t *x, uint8_t y, uint16_t color);
+
+
+      private:
+        Drivers::St7789& lcd;
+        const uint8_t width = 240;
+        const uint8_t height = 240;
+        void pixel_draw(uint8_t x, uint8_t y, uint16_t color);
+    };
+  }
+}