From 61ce1f48e09824aed7a880ec65f0157f0e464601 Mon Sep 17 00:00:00 2001
From: steschu77 <steschu77@gmail.com>
Date: Fri, 7 Nov 2025 16:42:41 +0800
Subject: [PATCH] Use MacroBlock::default() to initialize Vp8Decoder::top

---
 src/vp8.rs | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/src/vp8.rs b/src/vp8.rs
index a8d48f7..7ed8700 100644
--- a/src/vp8.rs
+++ b/src/vp8.rs
@@ -529,13 +529,13 @@ impl<R: Read> Vp8Decoder<R> {
         self.frame.width = w & 0x3FFF;
         self.frame.height = h & 0x3FFF;
 
-        self.top = init_top_macroblocks(self.frame.width as usize);
-        // Almost always the first macro block, except when non exists (i.e. `width == 0`)
-        self.left = self.top.first().copied().unwrap_or_default();
-
         self.mbwidth = self.frame.width.div_ceil(16);
         self.mbheight = self.frame.height.div_ceil(16);
 
+        self.top = vec![MacroBlock::default(); self.mbwidth.into()];
+        // Almost always the first macro block, except when non exists (i.e. `width == 0`)
+        self.left = self.top.first().copied().unwrap_or_default();
+
         self.frame.ybuf =
             vec![0u8; usize::from(self.mbwidth) * 16 * usize::from(self.mbheight) * 16];
         self.frame.ubuf = vec![0u8; usize::from(self.mbwidth) * 8 * usize::from(self.mbheight) * 8];
@@ -1291,19 +1291,6 @@ impl<R: Read> Vp8Decoder<R> {
     }
 }
 
-fn init_top_macroblocks(width: usize) -> Vec<MacroBlock> {
-    let mb_width = width.div_ceil(16);
-
-    let mb = MacroBlock {
-        // Section 11.3 #3
-        bpred: [IntraMode::DC; 16],
-        luma_mode: LumaMode::DC,
-        ..MacroBlock::default()
-    };
-
-    vec![mb; mb_width]
-}
-
 // set border
 fn set_chroma_border(
     left_border: &mut [u8],