add clear rows method

src/game/game.c

@@ -1,11 +1,42 @@
 #include "game.h"
 
 #include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
 
 #include "../main.h"
 #include "shapes.h"
 
 
+static void clear_row(Row* row, uint8_t y) {
+    // move the rows down from the specified height
+    for (; y > 0; y--)
+        memcpy(row[y].columns, row[y - 1].columns, COLUMNS * sizeof(Colour));
+
+    memset(row[0].columns, NONE, sizeof(Colour));
+}
+
+static void clear_rows(Row* row) {
+    // start at the lowest row
+    // integer will wrap
+    for (uint8_t y = ROWS - 1; y < ROWS; y--) {
+        Row* crow = &row[y];  // the current row
+        bool nfilled = false; // whether this row is filled
+
+        // loop through all the columns or till nfilled is true
+        for (uint8_t x = 0; x < COLUMNS; x++) {
+            if (crow->columns[x].packed == NONE) {
+                nfilled = true;
+                break;
+            }
+        }
+
+        // continue if the row isn;t filled
+        if (!nfilled)
+            clear_row(crow, y);
+    }
+}
+
 // sets a shape to the screen
 static void _set_shape(Row* row, const Shape shape, const Colour colour, const uint8_t pos_x) {
     for (uint8_t y = 0; y < SHAPE_HEIGHT; y++) {

src/window/colour.h

@@ -12,14 +12,28 @@ typedef union {
     };
 } Colour;
 
-#define COLOUR_RED ((Colour){0b11000011})
-#define COLOUR_YELLOW ((Colour){0b11110011})
-#define COLOUR_ORANGE ((Colour){0b11100011})
-#define COLOUR_GREEN ((Colour){0b00110011})
-#define COLOUR_CYAN ((Colour){0b00111111})
-#define COLOUR_BLUE ((Colour){0b00001111})
-#define COLOUR_MAGENTA ((Colour){0b11001111})
 
-#define COLOUR_NONE ((Colour){0})
+#define RED ((uint8_t)0b11000011)
-#define COLOUR_BLACK ((Colour){3})
+#define YELLOW ((uint8_t)0b11110011)
-#define COLOUR_WHITE ((Colour){0xFF})
+#define ORANGE ((uint8_t)0b11100011)
+#define GREEN ((uint8_t)0b00110011)
+#define CYAN ((uint8_t)0b00111111)
+#define BLUE ((uint8_t)0b00001111)
+#define MAGENTA ((uint8_t)0b11001111)
+
+#define NONE ((uint8_t)0)
+#define BLACK ((uint8_t)3)
+#define WHITE ((uint8_t)0xFF)
+
+
+#define COLOUR_RED ((Colour){RED})
+#define COLOUR_YELLOW ((Colour){YELLOW})
+#define COLOUR_ORANGE ((Colour){ORANGE})
+#define COLOUR_GREEN ((Colour){GREEN})
+#define COLOUR_CYAN ((Colour){CYAN})
+#define COLOUR_BLUE ((Colour){BLUE})
+#define COLOUR_MAGENTA ((Colour){MAGENTA})
+
+#define COLOUR_NONE ((Colour){NONE})
+#define COLOUR_BLACK ((Colour){BLACK})
+#define COLOUR_WHITE ((Colour){WHITE})