render checkerboard in unmapped areas

1 files changed, 3 insertions, 8 deletions

diff --git a/memview.c b/memview.c
index 9acdd22..4491f05 100644
--- a/memview.c
+++ b/memview.c
@@ -16,12 +16,6 @@ struct viewer {
 	uint8_t page_buffer[PAGE_SIZE];
 };
 
-enum color {
-	BLACK = 0x00000000,
-	WHITE = 0xFFFFFFFF,
-	GREY = 0xFF303030,
-};
-
 #define BIT_OF(X, I) (((X) >> (I)) & 1ULL)
 
 static uintptr_t zorder(int x, int y) {
@@ -83,12 +77,13 @@ static void render_page(SDL_Texture *tex, uint8_t *data) {
 		for (int i = 0; i < PAGE_SIZE; i++) {
 			for (int j = 0; j < CHAR_BIT; j++) {
 				uint8_t bit = (data[i] >> j) & 1;
-				pixels[i * CHAR_BIT + j] = bit ? WHITE : BLACK;
+				pixels[i * CHAR_BIT + j] = bit ? 0xFFFFFFFF : 0xFF000000;
 			}
 		}
 	} else {
 		for (int i = 0; i < PAGE_WIDTH * PAGE_HEIGHT; i++)
-			pixels[i] = GREY;
+			pixels[i] =
+				((i / 16) + i / PAGE_WIDTH / 16) % 2 ? 0xFF111111 : 0xFF333333;
 	}
 	SDL_UnlockTexture(tex);
 }