Fix reading 4-bit data

jepler · jepler · commit 7229fe631d5a · 2021-03-21T13:37:38.000-05:00
diff --git a/shared-module/bitmaptools/__init__.c b/shared-module/bitmaptools/__init__.c
@@ -464,7 +464,7 @@ void common_hal_bitmaptools_readinto(displayio_bitmap_t *self, pyb_file_obj_t *f
                     int byte_offset = x / 2;
                     int bit_offset = 4 * (reverse_pixels_in_element ? (1 - x % 2) : x % 2);
 
-                    value = (rowdata8[byte_offset] >> bit_offset) & 7;
+                    value = (rowdata8[byte_offset] >> bit_offset) & 15;
                     break;
                 }
                 case 8:

Original file line number	Diff line number	Diff line change
`@@ -464,7 +464,7 @@ void common_hal_bitmaptools_readinto(displayio_bitmap_t self, pyb_file_obj_t f`
`464`	`464`	`int byte_offset = x / 2;`
`465`	`465`	`int bit_offset = 4 * (reverse_pixels_in_element ? (1 - x % 2) : x % 2);`
`466`	`466`
`467`		`- value = (rowdata8[byte_offset] >> bit_offset) & 7;`
	`467`	`+ value = (rowdata8[byte_offset] >> bit_offset) & 15;`
`468`	`468`	`break;`
`469`	`469`	`}`
`470`	`470`	`case 8:`