[WIP] high-definition image preview when using kitty

(some cleaning to do but I need to sleep)

2 files changed, 50 insertions, 0 deletions

diff --git a/src/display/mod.rs b/src/display/mod.rs
index 8ed1fb2..c075b0c 100644
--- a/src/display/mod.rs
+++ b/src/display/mod.rs
@@ -30,6 +30,7 @@ pub mod flags_display;
 pub mod status_line;
 mod matched_string;
 mod screen;
+mod terminal_dimensions;
 
 #[cfg(not(any(target_family="windows",target_os="android")))]
 mod permissions;
@@ -43,6 +44,7 @@ pub use {
     git_status_display::GitStatusDisplay,
     matched_string::MatchedString,
     screen::Screen,
+    terminal_dimensions::*,
 };
 use {
     crate::{
@@ -74,6 +76,7 @@ lazy_static! {
 pub const WIDE_STATUS: bool = true;
 
 /// the type used by all GUI writing functions
+//pub type W = std::io::BufWriter<std::io::Stderr>;
 pub type W = std::io::BufWriter<std::io::Stderr>;
 
 /// return the writer used by the application
@@ -81,6 +84,15 @@ pub fn writer() -> W {
     std::io::BufWriter::new(std::io::stderr())
 }
 
+// /// the type used by all GUI writing functions
+// //pub type W = std::io::BufWriter<std::io::Stderr>;
+// pub type W = std::io::Stdout;
+//
+// /// return the writer used by the application
+// pub fn writer() -> W {
+//     std::io::stdout()
+// }
+
 
 pub fn fill_bg(
     w: &mut W,
diff --git a/src/display/terminal_dimensions.rs b/src/display/terminal_dimensions.rs
new file mode 100644
index 0000000..e90ae89
--- /dev/null
+++ b/src/display/terminal_dimensions.rs
@@ -0,0 +1,38 @@
+use {
+    libc::{
+        c_ushort,
+        ioctl,
+        STDOUT_FILENO,
+        TIOCGWINSZ,
+    },
+    std::io,
+};
+
+
+#[cfg(unix)]
+pub fn cell_size_in_pixels() -> io::Result<(u32, u32)> {
+    // see http://www.delorie.com/djgpp/doc/libc/libc_495.html
+    #[repr(C)]
+    struct winsize {
+        ws_row: c_ushort,     /* rows, in characters */
+        ws_col: c_ushort,     /* columns, in characters */
+        ws_xpixel: c_ushort,  /* horizontal size, pixels */
+        ws_ypixel: c_ushort   /* vertical size, pixels */
+    };
+    let w = winsize { ws_row: 0, ws_col: 0, ws_xpixel: 0, ws_ypixel: 0 };
+    let r = unsafe {
+        ioctl(STDOUT_FILENO, TIOCGWINSZ, &w)
+    };
+    if r == 0 && w.ws_xpixel > w.ws_col && w.ws_ypixel > w.ws_row {
+        Ok((
+            (w.ws_xpixel / w.ws_col) as u32,
+            (w.ws_ypixel / w.ws_row) as u32,
+        ))
+    } else {
+        Err(io::Error::new(
+            io::ErrorKind::Other,
+            "failed to fetch terminal dimension with ioctl",
+        ))
+    }
+}
+