From fe82a8a607415d804c5d1c0cbe5b4db6bdf06748 Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Sat, 15 Oct 2022 05:04:19 +0200
Subject: [PATCH] #178 fix blt/bltfast clipping

---
 src/ddsurface.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/ddsurface.c b/src/ddsurface.c
index 591ff7e..8c5540e 100644
--- a/src/ddsurface.c
+++ b/src/ddsurface.c
@@ -115,12 +115,18 @@ HRESULT dds_Blt(
     }
     */
 
+    if (dst_rect.right < 0)
+        dst_rect.right = 0;
+
     if (dst_rect.left < 0)
     {
         src_rect.left += (LONG)(abs(dst_rect.left) * scale_w);
         dst_rect.left = 0;
     }
 
+    if (dst_rect.bottom < 0)
+        dst_rect.bottom = 0;
+
     if (dst_rect.top < 0)
     {
         src_rect.top += (LONG)(abs(dst_rect.top) * scale_h);
@@ -147,9 +153,15 @@ HRESULT dds_Blt(
 
     if (src_surface)
     {
+        if (src_rect.right < 0)
+            src_rect.right = 0;
+
         if (src_rect.left < 0)
             src_rect.left = 0;
 
+        if (src_rect.bottom < 0)
+            src_rect.bottom = 0;
+
         if (src_rect.top < 0)
             src_rect.top = 0;
 
@@ -439,9 +451,15 @@ HRESULT dds_BltFast(
 
     if (src_surface)
     {
+        if (src_rect.right < 0)
+            src_rect.right = 0;
+
         if (src_rect.left < 0)
             src_rect.left = 0;
 
+        if (src_rect.bottom < 0)
+            src_rect.bottom = 0;
+
         if (src_rect.top < 0)
             src_rect.top = 0;
 
@@ -463,9 +481,15 @@ HRESULT dds_BltFast(
 
     RECT dst_rect = { dst_x, dst_y, (src_rect.right - src_rect.left) + dst_x, (src_rect.bottom - src_rect.top) + dst_y };
 
+    if (dst_rect.right < 0)
+        dst_rect.right = 0;
+
     if (dst_rect.left < 0)
         dst_rect.left = 0;
 
+    if (dst_rect.bottom < 0)
+        dst_rect.bottom = 0;
+
     if (dst_rect.top < 0)
         dst_rect.top = 0;