Clean up variable names

1 files changed, 3 insertions, 3 deletions

diff --git a/src/renderer_m4.c b/src/renderer_m4.c
index 28fdd1f..a849cfe 100644
--- a/src/renderer_m4.c
+++ b/src/renderer_m4.c
@@ -152,13 +152,13 @@ draw_line(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
         int x_step = x0 > x1 ?            -1 : 1;
         int y_step = y0 > y1 ? -SCREEN_WIDTH : SCREEN_WIDTH;
 
-        u32 addr = (u32)((u32)backbuf + (y0 * SCREEN_WIDTH + x0));
         u16 *dst = NULL;
+        uintptr_t addr = ((uintptr_t)backbuf + y0 * SCREEN_WIDTH + x0);
         u32 mask = x0 & 1 ? ~0xFF : 0xFF;
         u32 color = (clr & 0xFF) | ((clr & 0xFF) << 8);
         if (dx >= dy) {
             int diff = 2 * dy - dx;
-            for (int i = dx; i >= 0; i--) {
+            for (int i = 0; i < dx + 1; i++) {
                 dst = (u16 *)(addr - (mask >> 31));
                 *dst = (*dst & ~mask) | (color & mask);
                 if (diff >= 0) {
@@ -171,7 +171,7 @@ draw_line(size_t x0, size_t y0, size_t x1, size_t y1, u8 clr) {
             }
         } else {
             int diff = 2 * dx - dy;
-            for (int i = dy; i >= 0; i--) {
+            for (int i = 0; i < dy + 1; i++) {
                 dst = (u16 *)(addr - (mask >> 31));
                 *dst = (*dst & ~mask) | (color & mask);
                 if (diff >= 0) {