From bd99035701c28d6f01f694ccf54619e26fc70d78 Mon Sep 17 00:00:00 2001
From: Relintai <relintai@gmail.com>
Date: Wed, 23 Dec 2020 17:30:52 +0100
Subject: [PATCH] Fix an offset calculation error.

---
 CMakeLists.txt | 5 +++++
 main.c         | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6202553..7283d1e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,3 +12,8 @@ link_directories(/opt/vc/lib)
 add_executable(fbcp main.c)
 
 target_link_libraries(fbcp bcm_host)
+
+
+set (CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
+
+set (CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
\ No newline at end of file
diff --git a/main.c b/main.c
index bbe839d..3fa5527 100644
--- a/main.c
+++ b/main.c
@@ -154,10 +154,12 @@ int process_interlaced() {
           uint16_t *src = &screenbuf[bufNum][firstRow * vinfo.xres + firstCol];
           uint16_t *dst = (uint16_t *)&fbp[(firstRow * vinfo.xres + firstCol) * 2];
 
+	  uint32_t moffset = vinfo.xres * INTERLACE_NUM;
+
           for(int row = firstRow; row <= lastRow; row += INTERLACE_NUM) {
             memcpy(dst, src, bytes);
-            src += vinfo.xres;
-            dst += vinfo.xres;
+            src += moffset;
+            dst += moffset;
           }
 
 //          memcpy(fbp, screenbuf[2], vinfo.xres * vinfo.yres * 2);