Perhaps generates better code

1 files changed, 8 insertions, 8 deletions

diff --git a/src/vga.c b/src/vga.c
index 8230880..ec56b60 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -93,9 +93,9 @@ void blit(const uint8_t *sprite, const Rect *dst)
 {
     uint8_t *dbuffer = buffer + dst->x + dst->y * 320;
 
-    for (int16_t j = 0; j < dst->h; j++)
+    for (uint16_t j = dst->h; j > 0; j--)
     {
-        for (int16_t i = 0; i < dst->w; i++)
+        for (uint16_t i = dst->w; i > 0; i--)
         {
             uint8_t b = *sprite++;
 
@@ -116,9 +116,9 @@ void blit_c(const uint8_t *sprite, const Rect *dst, uint8_t c)
 {
     uint8_t *dbuffer = buffer + dst->x + dst->y * 320;
 
-    for (int16_t j = 0; j < dst->h; j++)
+    for (uint16_t j = dst->h; j > 0; j--)
     {
-        for (int16_t i = 0; i < dst->w; i++)
+        for (uint16_t i = dst->w; i > 0; i--)
         {
             uint8_t b = *sprite++;
 
@@ -140,9 +140,9 @@ void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst)
     uint8_t *dbuffer = buffer + dst->x + dst->y * 320;
     sprite += src->x + src->y * src->w;
 
-    for (int16_t j = 0; j < dst->h; j++)
+    for (uint16_t j = dst->h; j > 0; j--)
     {
-        for (int16_t i = 0; i < dst->w; i++)
+        for (uint16_t i = dst->w; i > 0; i--)
         {
             uint8_t b = *sprite++;
 
@@ -174,9 +174,9 @@ void read_buffer(uint8_t *dst, const Rect *src)
 {
     uint8_t *s = buffer + src->y * 320 + src->x;
 
-    for (int8_t j = 0; j < src->h; j++)
+    for (uint16_t j = src->h; j > 0; j--)
     {
-        for (int8_t i = 0; i < src->w; i++)
+        for (uint16_t i = src->w; i > 0; i--)
             *dst++ = *s++;
 
         s += 320 - src->w;