Merge pull request #402 from tomaka/caca

Add libcaca backend

4 files changed, 437 insertions, 0 deletions

diff --git a/src/api/caca/libcaca.rs b/src/api/caca/libcaca.rs
new file mode 100644
index 0000000..ce2d281
--- /dev/null
+++ b/src/api/caca/libcaca.rs
@@ -0,0 +1,187 @@
+use libc;
+use std::ffi::CStr;
+use std::mem;
+use api::dlopen;
+
+pub type caca_display_t = libc::c_void;
+pub type caca_canvas_t = libc::c_void;
+pub type caca_dither_t = libc::c_void;
+
+pub struct LibCaca {
+    lib: *mut libc::c_void,
+
+    caca_create_display: unsafe extern fn(*mut caca_canvas_t) -> *mut caca_display_t,
+    caca_free_display: unsafe extern fn(*mut caca_display_t) -> libc::c_int,
+    caca_get_canvas: unsafe extern fn(*mut caca_display_t) -> *mut caca_canvas_t,
+    caca_refresh_display: unsafe extern fn(*mut caca_display_t) -> libc::c_int,
+    caca_dither_bitmap: unsafe extern fn(*mut caca_canvas_t, libc::c_int, libc::c_int, libc::c_int,
+                                         libc::c_int, *const caca_dither_t, *const libc::c_void)
+                                         -> libc::c_int,
+    caca_free_dither: unsafe extern fn(*mut caca_dither_t) -> libc::c_int,
+    caca_create_dither: unsafe extern fn(libc::c_int, libc::c_int, libc::c_int, libc::c_int,
+                                         libc::uint32_t, libc::uint32_t, libc::uint32_t,
+                                         libc::uint32_t) -> *mut caca_dither_t,
+    caca_get_canvas_width: unsafe extern fn(*mut caca_canvas_t) -> libc::c_int,
+    caca_get_canvas_height: unsafe extern fn(*mut caca_canvas_t) -> libc::c_int,
+}
+
+#[derive(Debug)]
+pub struct OpenError {
+    reason: String
+}
+
+impl LibCaca {
+    pub fn open() -> Result<LibCaca, OpenError> {
+        let lib = unsafe { dlopen::dlopen(b"libcaca.so.0\0".as_ptr() as *const _,
+                                          dlopen::RTLD_NOW) };
+
+        if lib.is_null() {
+            let cstr = unsafe { CStr::from_ptr(dlopen::dlerror()) };
+            let reason = String::from_utf8(cstr.to_bytes().to_vec()).unwrap();
+            return Err(OpenError { reason: reason });
+        }
+
+        let caca_create_display = match unsafe { dlopen::dlsym(lib,
+                                        b"caca_create_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_create_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_free_display = match unsafe { dlopen::dlsym(lib,
+                                      b"caca_free_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_free_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas = match unsafe { dlopen::dlsym(lib,
+                                    b"caca_get_canvas\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_refresh_display = match unsafe { dlopen::dlsym(lib,
+                                         b"caca_refresh_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_refresh_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_dither_bitmap = match unsafe { dlopen::dlsym(lib,
+                                       b"caca_dither_bitmap\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_dither_bitmap".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_free_dither = match unsafe { dlopen::dlsym(lib,
+                                     b"caca_free_dither\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_free_dither".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_create_dither = match unsafe { dlopen::dlsym(lib,
+                                       b"caca_create_dither\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_create_dither".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas_width = match unsafe { dlopen::dlsym(lib,
+                                          b"caca_get_canvas_width\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas_width".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas_height = match unsafe { dlopen::dlsym(lib,
+                                           b"caca_get_canvas_height\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas_height".to_string()
+            }),
+            ptr => ptr
+        };
+
+        Ok(LibCaca {
+            lib: lib,
+
+            caca_create_display: unsafe { mem::transmute(caca_create_display) },
+            caca_free_display: unsafe { mem::transmute(caca_free_display) },
+            caca_get_canvas: unsafe { mem::transmute(caca_get_canvas) },
+            caca_refresh_display: unsafe { mem::transmute(caca_refresh_display) },
+            caca_dither_bitmap: unsafe { mem::transmute(caca_dither_bitmap) },
+            caca_free_dither: unsafe { mem::transmute(caca_free_dither) },
+            caca_create_dither: unsafe { mem::transmute(caca_create_dither) },
+            caca_get_canvas_width: unsafe { mem::transmute(caca_get_canvas_width) },
+            caca_get_canvas_height: unsafe { mem::transmute(caca_get_canvas_height) },
+        })
+    }
+
+    pub unsafe fn caca_create_display(&self, cv: *mut caca_canvas_t) -> *mut caca_display_t {
+        (self.caca_create_display)(cv)
+    }
+
+    pub unsafe fn caca_free_display(&self, dp: *mut caca_display_t) -> libc::c_int {
+        (self.caca_free_display)(dp)
+    }
+
+    pub unsafe fn caca_get_canvas(&self, dp: *mut caca_display_t) -> *mut caca_canvas_t {
+        (self.caca_get_canvas)(dp)
+    }
+
+    pub unsafe fn caca_refresh_display(&self, dp: *mut caca_display_t) -> libc::c_int {
+        (self.caca_refresh_display)(dp)
+    }
+
+    pub unsafe fn caca_dither_bitmap(&self, cv: *mut caca_canvas_t, x: libc::c_int, y: libc::c_int,
+                                     w: libc::c_int, h: libc::c_int, d: *const caca_dither_t,
+                                     pixels: *const libc::c_void) -> libc::c_int
+    {
+        (self.caca_dither_bitmap)(cv, x, y, w, h, d, pixels)
+    }
+
+    pub unsafe fn caca_free_dither(&self, d: *mut caca_dither_t) -> libc::c_int {
+        (self.caca_free_dither)(d)
+    }
+
+    pub unsafe fn caca_create_dither(&self, bpp: libc::c_int, w: libc::c_int, h: libc::c_int,
+                                     pitch: libc::c_int, rmask: libc::uint32_t, gmask: libc::uint32_t,
+                                     bmask: libc::uint32_t, amask: libc::uint32_t) -> *mut caca_dither_t
+    {
+        (self.caca_create_dither)(bpp, w, h, pitch, rmask, gmask, bmask, amask)
+    }
+
+    pub unsafe fn caca_get_canvas_width(&self, cv: *mut caca_canvas_t) -> libc::c_int {
+        (self.caca_get_canvas_width)(cv)
+    }
+
+    pub unsafe fn caca_get_canvas_height(&self, cv: *mut caca_canvas_t) -> libc::c_int {
+        (self.caca_get_canvas_height)(cv)
+    }
+}
+
+impl Drop for LibCaca {
+    fn drop(&mut self) {
+        unsafe { dlopen::dlclose(self.lib); }
+    }
+}
diff --git a/src/api/caca/mod.rs b/src/api/caca/mod.rs
new file mode 100644
index 0000000..6888e49
--- /dev/null
+++ b/src/api/caca/mod.rs
@@ -0,0 +1,241 @@
+#![cfg(all(any(target_os = "linux", target_os = "freebsd"), feature="headless"))]
+
+use libc;
+use api::osmesa::OsMesaContext;
+
+use BuilderAttribs;
+use CreationError;
+use Event;
+use PixelFormat;
+use CursorState;
+use MouseCursor;
+
+use std::collections::VecDeque;
+use std::ptr;
+
+mod libcaca;
+
+pub struct Window {
+    libcaca: libcaca::LibCaca,
+    display: *mut libcaca::caca_display_t,
+    opengl: OsMesaContext,
+    dither: *mut libcaca::caca_dither_t,
+}
+
+#[derive(Clone)]
+pub struct WindowProxy;
+
+impl WindowProxy {
+    pub fn wakeup_event_loop(&self) {
+        unimplemented!()
+    }
+}
+
+pub struct MonitorID;
+
+pub fn get_available_monitors() -> VecDeque<MonitorID> {
+    VecDeque::new()
+}
+pub fn get_primary_monitor() -> MonitorID {
+    MonitorID
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        unimplemented!();
+    }
+
+    pub fn get_native_identifier(&self) -> ::native_monitor::NativeMonitorId {
+        ::native_monitor::NativeMonitorId::Unavailable
+    }
+
+    pub fn get_dimensions(&self) -> (u32, u32) {
+        unimplemented!();
+    }
+}
+
+pub struct PollEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for PollEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        None
+    }
+}
+
+pub struct WaitEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for WaitEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        loop {}
+    }
+}
+
+impl Window {
+    pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+        let opengl = try!(OsMesaContext::new(builder));
+        let opengl_dimensions = opengl.get_dimensions();
+
+        let libcaca = match libcaca::LibCaca::open() {
+            Err(_) => return Err(CreationError::NotSupported),
+            Ok(l) => l
+        };
+
+        let display = unsafe { libcaca.caca_create_display(ptr::null_mut()) };
+
+        if display.is_null() {
+            return Err(CreationError::OsError("caca_create_display failed".to_string()));
+        }
+
+        let dither = unsafe {
+            #[cfg(target_endian = "little")]
+            fn get_masks() -> (u32, u32, u32, u32) { (0xff, 0xff00, 0xff0000, 0xff000000) }
+            #[cfg(target_endian = "big")]
+            fn get_masks() -> (u32, u32, u32, u32) { (0xff000000, 0xff0000, 0xff00, 0xff) }
+
+            let masks = get_masks();
+            libcaca.caca_create_dither(32, opengl_dimensions.0 as libc::c_int,
+                                       opengl_dimensions.1 as libc::c_int,
+                                       opengl_dimensions.0 as libc::c_int * 4,
+                                       masks.0, masks.1, masks.2, masks.3)
+        };
+
+        if dither.is_null() {
+            unsafe { libcaca.caca_free_display(display) };
+            return Err(CreationError::OsError("caca_create_dither failed".to_string()));
+        }
+
+        Ok(Window {
+            libcaca: libcaca,
+            display: display,
+            opengl: opengl,
+            dither: dither,
+        })
+    }
+
+    pub fn is_closed(&self) -> bool {
+        false
+    }
+
+    pub fn set_title(&self, title: &str) {
+    }
+
+    pub fn show(&self) {
+    }
+
+    pub fn hide(&self) {
+    }
+
+    pub fn get_position(&self) -> Option<(i32, i32)> {
+        unimplemented!()
+    }
+
+    pub fn set_position(&self, x: i32, y: i32) {
+    }
+
+    pub fn get_inner_size(&self) -> Option<(u32, u32)> {
+        Some(self.opengl.get_dimensions())
+    }
+
+    pub fn get_outer_size(&self) -> Option<(u32, u32)> {
+        self.get_inner_size()
+    }
+
+    pub fn set_inner_size(&self, _x: u32, _y: u32) {
+        unimplemented!()
+    }
+
+    pub fn create_window_proxy(&self) -> WindowProxy {
+        unimplemented!()
+    }
+
+    pub fn poll_events(&self) -> PollEventsIterator {
+        PollEventsIterator {
+            window: self
+        }
+    }
+
+    pub fn wait_events(&self) -> WaitEventsIterator {
+        WaitEventsIterator {
+            window: self
+        }
+    }
+
+    pub unsafe fn make_current(&self) {
+        self.opengl.make_current()
+    }
+
+    pub fn is_current(&self) -> bool {
+        self.opengl.is_current()
+    }
+
+    pub fn get_proc_address(&self, addr: &str) -> *const () {
+        self.opengl.get_proc_address(addr) as *const _
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe {
+            let canvas = self.libcaca.caca_get_canvas(self.display);
+            let width = self.libcaca.caca_get_canvas_width(canvas);
+            let height = self.libcaca.caca_get_canvas_height(canvas);
+
+            let buffer = self.opengl.get_framebuffer().chunks(self.opengl.get_dimensions().0 as usize)
+                                    .flat_map(|i| i.iter().cloned()).rev().collect::<Vec<u32>>();
+
+            self.libcaca.caca_dither_bitmap(canvas, 0, 0, width as libc::c_int,
+                                            height as libc::c_int, self.dither,
+                                            buffer.as_ptr() as *const _);
+            self.libcaca.caca_refresh_display(self.display);
+        };
+    }
+
+    pub fn platform_display(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    pub fn platform_window(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    pub fn get_api(&self) -> ::Api {
+        self.opengl.get_api()
+    }
+
+    pub fn get_pixel_format(&self) -> PixelFormat {
+        unimplemented!();
+    }
+
+    pub fn set_window_resize_callback(&mut self, _: Option<fn(u32, u32)>) {
+    }
+
+    pub fn set_cursor(&self, cursor: MouseCursor) {
+    }
+
+    pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> {
+        Ok(())
+    }
+
+    pub fn hidpi_factor(&self) -> f32 {
+        1.0
+    }
+
+    pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> {
+        Ok(())
+    }
+}
+
+impl Drop for Window {
+    fn drop(&mut self) {
+        unsafe {
+            self.libcaca.caca_free_dither(self.dither);
+            self.libcaca.caca_free_display(self.display);
+        }
+    }
+}
diff --git a/src/api/mod.rs b/src/api/mod.rs
index 34ef01d..b8cf9de 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -1,4 +1,5 @@
 pub mod android;
+pub mod caca;
 pub mod cocoa;
 pub mod dlopen;
 pub mod egl;
diff --git a/src/api/osmesa/mod.rs b/src/api/osmesa/mod.rs
index 585ce72..ea90583 100644
--- a/src/api/osmesa/mod.rs
+++ b/src/api/osmesa/mod.rs
@@ -35,6 +35,14 @@ impl OsMesaContext {
         })
     }
 
+    pub fn get_framebuffer(&self) -> &[u32] {
+        &self.buffer
+    }
+
+    pub fn get_dimensions(&self) -> (u32, u32) {
+        (self.width, self.height)
+    }
+
     pub unsafe fn make_current(&self) {
         let ret = osmesa_sys::OSMesaMakeCurrent(self.context,
             self.buffer.as_ptr() as *mut libc::c_void,