Marginally faster

1 files changed, 9 insertions, 4 deletions

diff --git a/src/vga.c b/src/vga.c
index 13013b2..70a9a67 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -99,6 +99,7 @@ void blit(const uint8_t *sprite, const Rect *dst)
 {
     uint8_t b;
     uint8_t *dtarget = target + dst->x + dst->y * 320;
+    const uint16_t inc = 320 - dst->w;
 
     for (uint16_t j = dst->h; j > 0; j--)
     {
@@ -115,7 +116,7 @@ void blit(const uint8_t *sprite, const Rect *dst)
 
             *dtarget++ = b;
         }
-        dtarget += 320 - dst->w;
+        dtarget += inc;
     }
 }
 
@@ -123,6 +124,7 @@ void blit_c(const uint8_t *sprite, const Rect *dst, uint8_t c)
 {
     uint8_t b;
     uint8_t *dtarget = target + dst->x + dst->y * 320;
+    const uint16_t inc = 320 - dst->w;
 
     for (uint16_t j = dst->h; j > 0; j--)
     {
@@ -139,7 +141,7 @@ void blit_c(const uint8_t *sprite, const Rect *dst, uint8_t c)
 
             *dtarget++ = b ? c : b;
         }
-        dtarget += 320 - dst->w;
+        dtarget += inc;
     }
 }
 
@@ -147,6 +149,9 @@ void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst)
 {
     uint8_t b;
     uint8_t *dtarget = target + dst->x + dst->y * 320;
+    const uint16_t inc1 = src->w - dst->w;
+    const uint16_t inc2 = 320 - dst->w;
+
     sprite += src->x + src->y * src->w;
 
     for (uint16_t j = dst->h; j > 0; j--)
@@ -164,8 +169,8 @@ void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst)
 
             *dtarget++ = b;
         }
-        sprite += src->w - dst->w;
-        dtarget += 320 - dst->w;
+        sprite += inc1;
+        dtarget += inc2;
     }
 }