Faster version with no clipping

1 files changed, 7 insertions, 12 deletions

diff --git a/src/vga.c b/src/vga.c
index 1190b6e..df79c7c 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -158,17 +158,12 @@ void blit_update()
 
 void read_buffer(uint8_t *dst, const Rect *src)
 {
-    for (int32_t j = src->y * 320; j < (src->y + src->h) * 320; j += 320)
-        for (int16_t i = src->x; i < src->x + src->w; i++)
-        {
-            uint8_t b;
-
-            /* clipping */
-            if (i < 0 || i >= 320 || j < 0 || j >= 200 * 320)
-                b = TRANSPARENT;
-            else
-                b = buffer[i + j];
+    uint8_t *s = buffer + src->y * 320 + src->x;
 
-            *dst++ = b;
-        }
+    for (int8_t j = 0; j < src->h; j++)
+    {
+        memcpy(dst, s, src->w);
+        dst += src->w;
+        s += 320;
+    }
 }