diff --git a/src/cli/screenshot.rs b/src/cli/screenshot.rs
index 1804d653..42379582 100644
--- a/src/cli/screenshot.rs
+++ b/src/cli/screenshot.rs
@@ -3,7 +3,7 @@ use {
         cli::{GlobalArgs, ScreenshotArgs, ScreenshotFormat},
         format::XRGB8888,
         tools::tool_client::{with_tool_client, Handle, ToolClient},
-        utils::{errorfmt::ErrorFmt, queue::AsyncQueue},
+        utils::{errorfmt::ErrorFmt, queue::AsyncQueue, windows::WindowsExt},
         video::{
             dmabuf::{DmaBuf, DmaBufIds, DmaBufPlane, PlaneVec},
             drm::Drm,
@@ -107,7 +107,7 @@ pub fn buf_to_bytes(dma_buf_ids: &DmaBufIds, buf: &Dmabuf, format: ScreenshotFor
             fatal!("Could not import screenshot dmabuf: {}", ErrorFmt(e));
         }
     };
-    let bo_map = match bo.map() {
+    let bo_map = match bo.map_read() {
         Ok(map) => map,
         Err(e) => {
             fatal!("Could not map dmabuf: {}", ErrorFmt(e));
@@ -115,14 +115,18 @@ pub fn buf_to_bytes(dma_buf_ids: &DmaBufIds, buf: &Dmabuf, format: ScreenshotFor
     };
     let data = unsafe { bo_map.data() };
     if format == ScreenshotFormat::Qoi {
-        return xrgb8888_encode_qoi(data, buf.width, buf.height, buf.stride);
+        return xrgb8888_encode_qoi(data, buf.width, buf.height, bo_map.stride() as u32);
     }
 
     let mut out = vec![];
     {
-        let mut image_data = Vec::with_capacity(data.len());
-        for i in 0..data.len() / 4 {
-            image_data.extend_from_slice(&[data[4 * i + 2], data[4 * i + 1], data[4 * i + 0], 255])
+        let mut image_data = Vec::with_capacity((buf.width * buf.height * 4) as usize);
+        let lines = data[..(buf.height as usize * bo_map.stride() as usize)]
+            .chunks_exact(bo_map.stride() as usize);
+        for line in lines {
+            for pixel in line[..(buf.width as usize * 4)].array_chunks_ext::<4>() {
+                image_data.extend_from_slice(&[pixel[2], pixel[1], pixel[0], 255])
+            }
         }
         let mut encoder = Encoder::new(&mut out, buf.width, buf.height);
         encoder.set_color(ColorType::Rgba);
diff --git a/src/video/gbm.rs b/src/video/gbm.rs
index bc7c04f0..8a19363d 100644
--- a/src/video/gbm.rs
+++ b/src/video/gbm.rs
@@ -148,12 +148,22 @@ pub struct GbmBoMap {
     bo: Rc<GbmBo>,
     data: *mut [u8],
     opaque: *mut u8,
+    stride: i32,
 }
 
 impl GbmBoMap {
     pub unsafe fn data(&self) -> &[u8] {
         &*self.data
     }
+
+    #[allow(dead_code)]
+    pub fn data_ptr(&self) -> *mut u8 {
+        self.data as _
+    }
+
+    pub fn stride(&self) -> i32 {
+        self.stride
+    }
 }
 
 unsafe fn export_bo(dmabuf_ids: &DmaBufIds, bo: *mut Bo) -> Result<DmaBuf, GbmError> {
@@ -293,7 +303,16 @@ impl GbmBo {
         &self.dmabuf
     }
 
-    pub fn map(self: &Rc<Self>) -> Result<GbmBoMap, GbmError> {
+    pub fn map_read(self: &Rc<Self>) -> Result<GbmBoMap, GbmError> {
+        self.map2(GBM_BO_TRANSFER_READ)
+    }
+
+    #[allow(dead_code)]
+    pub fn map_write(self: &Rc<Self>) -> Result<GbmBoMap, GbmError> {
+        self.map2(GBM_BO_TRANSFER_READ_WRITE)
+    }
+
+    fn map2(self: &Rc<Self>, flags: u32) -> Result<GbmBoMap, GbmError> {
         let mut stride = 0;
         let mut map_data = ptr::null_mut();
         unsafe {
@@ -303,7 +322,7 @@ impl GbmBo {
                 0,
                 self.dmabuf.width as _,
                 self.dmabuf.height as _,
-                GBM_BO_TRANSFER_READ,
+                flags,
                 &mut stride,
                 &mut map_data,
             );
@@ -315,6 +334,7 @@ impl GbmBo {
                 bo: self.clone(),
                 data: map,
                 opaque: map_data,
+                stride: stride as i32,
             })
         }
     }