Add support for grayscale displays that are < 8 bit depth.

This also improves Palette so it stores the original RGB888 colors.

Lastly, it adds I2CDisplay as a display bus to talk over I2C. Particularly
useful for the SSD1306.

Fixes #1828. Fixes #1956

1 files changed, 3 insertions, 1 deletions

diff --git a/shared-module/displayio/Display.h b/shared-module/displayio/Display.h
index fa8902ced..96d1c06d5 100644
--- a/shared-module/displayio/Display.h
+++ b/shared-module/displayio/Display.h
@@ -52,11 +52,13 @@ typedef struct {
     uint64_t last_backlight_refresh;
     displayio_buffer_transform_t transform;
     displayio_area_t area;
+    mp_float_t current_brightness;
     uint16_t width;
     uint16_t height;
-    uint16_t color_depth;
+    _displayio_colorspace_t colorspace;
     int16_t colstart;
     int16_t rowstart;
+    uint16_t brightness_command;
     uint8_t set_column_command;
     uint8_t set_row_command;
     uint8_t write_ram_command;