add the long awaited push_9slice

src/rendering/twn_rendering.c

@@ -50,6 +50,147 @@ void push_rectangle(Rect rect, Color color) {
 }
 
 
+void push_9slice(char *texture_path, int texture_w, int texture_h, int border_thickness, Rect rect, Color color) {
+    const float bt = (float)border_thickness; /* i know! */
+    const float bt2 = bt * 2; /* combined size of the two borders in an axis */
+
+
+    Rect top_left = {
+        .x = rect.x,
+        .y = rect.y,
+        .w = bt,
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, top_left),
+        m_opt(texture_region, ((Rect) { 0, 0, bt, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect top_center = {
+        .x = rect.x + bt,
+        .y = rect.y,
+        .w = rect.w - bt2, /* here bt2 represents the top left and right corners */
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, top_center),
+        m_opt(texture_region, ((Rect) { bt, 0, (float)texture_w - bt2, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect top_right = {
+        .x = rect.x + (rect.w - bt),
+        .y = rect.y,
+        .w = bt,
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, top_right),
+        m_opt(texture_region, ((Rect) { (float)texture_w - bt, 0, bt, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect center_left = {
+        .x = rect.x,
+        .y = rect.y + bt,
+        .w = bt,
+        .h = rect.h - bt2, /* here bt2 represents the top and bottom left corners */
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, center_left),
+        m_opt(texture_region, ((Rect) { 0, bt, bt, (float)texture_h - bt2 })),
+        m_opt(color, color),
+    );
+
+
+    Rect center_right = {
+        .x = rect.x + (rect.w - bt),
+        .y = rect.y + bt,
+        .w = bt,
+        .h = rect.h - bt2, /* here bt2 represents the top and bottom right corners */
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, center_right),
+        m_opt(texture_region, ((Rect) { (float)texture_w - bt, bt, bt, (float)texture_h - bt2 })),
+        m_opt(color, color),
+    );
+
+
+    Rect bottom_left = {
+        .x = rect.x,
+        .y = rect.y + (rect.h - bt),
+        .w = bt,
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, bottom_left),
+        m_opt(texture_region, ((Rect) { 0, (float)texture_h - bt, bt, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect bottom_center = {
+        .x = rect.x + bt,
+        .y = rect.y + (rect.h - bt),
+        .w = rect.w - bt2, /* here bt2 represents the bottom left and right corners */
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, bottom_center),
+        m_opt(texture_region, ((Rect) { bt, (float)texture_h - bt, (float)texture_w - bt2, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect bottom_right = {
+        .x = rect.x + (rect.w - bt),
+        .y = rect.y + (rect.h - bt),
+        .w = bt,
+        .h = bt,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, bottom_right),
+        m_opt(texture_region, ((Rect) { (float)texture_w - bt, (float)texture_h - bt, bt, bt })),
+        m_opt(color, color),
+    );
+
+
+    Rect center = {
+        .x = rect.x + bt,
+        .y = rect.y + bt,
+        .w = rect.w - bt2,
+        .h = rect.h - bt2,
+    };
+
+    m_sprite(
+        m_set(path, texture_path),
+        m_set(rect, center),
+        m_opt(texture_region, ((Rect) { bt, bt, (float)texture_w - bt2, (float)texture_h - bt2 })),
+        m_opt(color, color),
+    );
+}
+
+
 static void render_2d(void) {
     use_2d_pipeline();