[display] Refactor to avoid implicit framebuffer allocation.

target/dartuinoP0/include/target/display/LS027B7DH01.h

Index: target/dartuinoP0/include/target/display/LS027B7DH01.h
diff --git a/target/dartuinoP0/include/target/display/LS027B7DH01.h b/target/dartuinoP0/include/target/display/LS027B7DH01.h
index e34889f11afeb3b562ab448a02f4b24d7269ac0e..b8433a44bc41e73efe6085a26a1df41760739cf4 100644
--- a/target/dartuinoP0/include/target/display/LS027B7DH01.h
+++ b/target/dartuinoP0/include/target/display/LS027B7DH01.h
@@ -30,10 +30,11 @@
 #define MLCD_WIDTH  ((uint16_t)400)
 #define MLCD_HEIGHT ((uint16_t)240)
 
+// Ensure width corresponds to an integral number of bytes
+STATIC_ASSERT((MLCD_WIDTH & 0x3) == 0);
+
 // 1 bit per pixel divided by 8 bits per byte
 #define MLCD_BYTES_LINE  (MLCD_WIDTH / 8)
+#define MLCD_FORMAT      (DISPLAY_FORMAT_MONO_1)
 
-#define FB_FORMAT               (DISPLAY_FORMAT_MONO_8)
-#define FB_STRIDE               (MLCD_WIDTH)
-
-uint8_t lcd_get_line(uint8_t *framebuffer, uint8_t idx, uint8_t *result);
+uint8_t lcd_get_line(struct display_image *image, uint8_t idx, uint8_t *result);