c_api.rs 39.3 KB
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use std::cell::{Cell, Ref, RefCell, RefMut};
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use std::ffi::{CStr, CString};
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use std::ops;
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use std::path::PathBuf;
use std::ptr;
use std::slice;
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use std::sync::Once;
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use std::{f64, i32};

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use gdk_pixbuf::Pixbuf;
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use libc;
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use url::Url;
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use gio::prelude::*;

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use glib::object::ObjectClass;
use glib::subclass;
use glib::subclass::object::ObjectClassSubclassExt;
use glib::subclass::prelude::*;
use glib::translate::*;
use glib::value::{FromValue, FromValueOptional, SetValue};
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use glib::{Bytes, Cast, ParamFlags, ParamSpec, StaticType, ToValue, Type, Value};
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use glib_sys;
use gobject_sys::{self, GEnumValue, GFlagsValue};

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use crate::dpi::Dpi;
use crate::drawing_ctx::RsvgRectangle;
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use crate::error::{set_gerror, LoadingError, RenderingError, RSVG_ERROR_FAILED};
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use crate::handle::{Handle, LoadOptions};
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use crate::length::RsvgLength;
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use crate::structure::IntrinsicDimensions;
use crate::util::rsvg_g_warning;
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mod handle_flags {
    // The following is entirely stolen from the auto-generated code
    // for GBindingFlags, from gtk-rs/glib/src/gobject/auto/flags.rs

    use super::*;

    // Keep these in sync with rsvg.h:RsvgHandleFlags
    #[cfg_attr(rustfmt, rustfmt_skip)]
    bitflags! {
        pub struct HandleFlags: u32 {
            const NONE            = 0;
            const UNLIMITED       = 1 << 0;
            const KEEP_IMAGE_DATA = 1 << 1;
        }
    }

    pub type RsvgHandleFlags = libc::c_uint;

    impl ToGlib for HandleFlags {
        type GlibType = RsvgHandleFlags;

        fn to_glib(&self) -> RsvgHandleFlags {
            self.bits()
        }
    }

    impl FromGlib<RsvgHandleFlags> for HandleFlags {
        fn from_glib(value: RsvgHandleFlags) -> HandleFlags {
            HandleFlags::from_bits_truncate(value)
        }
    }

    impl StaticType for HandleFlags {
        fn static_type() -> Type {
            unsafe { from_glib(rsvg_rust_handle_flags_get_type()) }
        }
    }

    impl<'a> FromValueOptional<'a> for HandleFlags {
        unsafe fn from_value_optional(value: &Value) -> Option<Self> {
            Some(FromValue::from_value(value))
        }
    }

    impl<'a> FromValue<'a> for HandleFlags {
        unsafe fn from_value(value: &Value) -> Self {
            from_glib(gobject_sys::g_value_get_flags(value.to_glib_none().0))
        }
    }

    impl SetValue for HandleFlags {
        unsafe fn set_value(value: &mut Value, this: &Self) {
            gobject_sys::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
        }
    }
}

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#[derive(Default, Copy, Clone)]
struct LoadFlags {
    pub unlimited_size: bool,
    pub keep_image_data: bool,
}

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pub use self::handle_flags::*;

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impl From<HandleFlags> for LoadFlags {
    fn from(hflags: HandleFlags) -> LoadFlags {
        LoadFlags {
            unlimited_size: hflags.contains(HandleFlags::UNLIMITED),
            keep_image_data: hflags.contains(HandleFlags::KEEP_IMAGE_DATA),
        }
    }
}

impl From<LoadFlags> for HandleFlags {
    fn from(lflags: LoadFlags) -> HandleFlags {
        let mut hflags = HandleFlags::empty();

        if lflags.unlimited_size {
            hflags.insert(HandleFlags::UNLIMITED);
        }

        if lflags.keep_image_data {
            hflags.insert(HandleFlags::KEEP_IMAGE_DATA);
        }

        hflags
    }
}

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// Keep in sync with rsvg.h:RsvgDimensionData
#[repr(C)]
pub struct RsvgDimensionData {
    pub width: libc::c_int,
    pub height: libc::c_int,
    pub em: f64,
    pub ex: f64,
}

// Keep in sync with rsvg.h:RsvgPositionData
#[repr(C)]
pub struct RsvgPositionData {
    pub x: libc::c_int,
    pub y: libc::c_int,
}

// Keep in sync with rsvg.h:RsvgSizeFunc
pub type RsvgSizeFunc = Option<
    unsafe extern "C" fn(
        inout_width: *mut libc::c_int,
        inout_height: *mut libc::c_int,
        user_data: glib_sys::gpointer,
    ),
>;

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// Keep this in sync with rsvg.h:RsvgHandleClass
#[repr(C)]
pub struct RsvgHandleClass {
    parent: gobject_sys::GObjectClass,

    _abi_padding: [glib_sys::gpointer; 15],
}

// Keep this in sync with rsvg.h:RsvgHandle
#[repr(C)]
pub struct RsvgHandle {
    parent: gobject_sys::GObject,

    _abi_padding: [glib_sys::gpointer; 16],
}

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pub struct SizeCallback {
    size_func: RsvgSizeFunc,
    user_data: glib_sys::gpointer,
    destroy_notify: glib_sys::GDestroyNotify,
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    in_loop: Cell<bool>,
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}

impl SizeCallback {
    pub fn call(&self, width: libc::c_int, height: libc::c_int) -> (libc::c_int, libc::c_int) {
        unsafe {
            let mut w = width;
            let mut h = height;

            if let Some(ref f) = self.size_func {
                f(&mut w, &mut h, self.user_data);
            };

            (w, h)
        }
    }
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    pub fn start_loop(&self) {
        assert!(!self.in_loop.get());
        self.in_loop.set(true);
    }

    pub fn end_loop(&self) {
        assert!(self.in_loop.get());
        self.in_loop.set(false);
    }

    pub fn get_in_loop(&self) -> bool {
        self.in_loop.get()
    }
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}

impl Default for SizeCallback {
    fn default() -> SizeCallback {
        SizeCallback {
            size_func: None,
            user_data: ptr::null_mut(),
            destroy_notify: None,
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            in_loop: Cell::new(false),
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        }
    }
}

impl Drop for SizeCallback {
    fn drop(&mut self) {
        unsafe {
            if let Some(ref f) = self.destroy_notify {
                f(self.user_data);
            };
        }
    }
}

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enum LoadState {
    // Just created the CHandle
    Start,

    // Being loaded using the legacy write()/close() API
    Loading { buffer: Vec<u8> },

    ClosedOk { handle: Handle },

    ClosedError,
}

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/// Contains all the interior mutability for a RsvgHandle to be called
/// from the C API.
pub struct CHandle {
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    dpi: Cell<Dpi>,
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    load_flags: Cell<LoadFlags>,
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    base_url: RefCell<Option<Url>>,
    base_url_cstring: RefCell<Option<CString>>, // needed because the C api returns *const char
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    size_callback: RefCell<SizeCallback>,
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    is_testing: Cell<bool>,
    load_state: RefCell<LoadState>,
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}

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unsafe impl ClassStruct for RsvgHandleClass {
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    type Type = CHandle;
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}

unsafe impl InstanceStruct for RsvgHandle {
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    type Type = CHandle;
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}

impl ops::Deref for RsvgHandleClass {
    type Target = ObjectClass;

    fn deref(&self) -> &Self::Target {
        unsafe { &*(self as *const _ as *const Self::Target) }
    }
}

impl ops::DerefMut for RsvgHandleClass {
    fn deref_mut(&mut self) -> &mut Self::Target {
        unsafe { &mut *(self as *mut _ as *mut Self::Target) }
    }
}

static PROPERTIES: [subclass::Property; 11] = [
    subclass::Property("flags", |name| {
        ParamSpec::flags(
            name,
            "Flags",
            "Loading flags",
            HandleFlags::static_type(),
            0,
            ParamFlags::READWRITE | ParamFlags::CONSTRUCT_ONLY,
        )
    }),
    subclass::Property("dpi-x", |name| {
        ParamSpec::double(
            name,
            "Horizontal DPI",
            "Horizontal resolution in dots per inch",
            0.0,
            f64::MAX,
            0.0,
            ParamFlags::READWRITE | ParamFlags::CONSTRUCT,
        )
    }),
    subclass::Property("dpi-y", |name| {
        ParamSpec::double(
            name,
            "Vertical DPI",
            "Vertical resolution in dots per inch",
            0.0,
            f64::MAX,
            0.0,
            ParamFlags::READWRITE | ParamFlags::CONSTRUCT,
        )
    }),
    subclass::Property("base-uri", |name| {
        ParamSpec::string(
            name,
            "Base URI",
            "Base URI for resolving relative references",
            None,
            ParamFlags::READWRITE | ParamFlags::CONSTRUCT,
        )
    }),
    subclass::Property("width", |name| {
        ParamSpec::int(
            name,
            "Image width",
            "Image width",
            0,
            i32::MAX,
            0,
            ParamFlags::READABLE,
        )
    }),
    subclass::Property("height", |name| {
        ParamSpec::int(
            name,
            "Image height",
            "Image height",
            0,
            i32::MAX,
            0,
            ParamFlags::READABLE,
        )
    }),
    subclass::Property("em", |name| {
        ParamSpec::double(name, "em", "em", 0.0, f64::MAX, 0.0, ParamFlags::READABLE)
    }),
    subclass::Property("ex", |name| {
        ParamSpec::double(name, "ex", "ex", 0.0, f64::MAX, 0.0, ParamFlags::READABLE)
    }),
    subclass::Property("title", |name| {
        ParamSpec::string(name, "deprecated", "deprecated", None, ParamFlags::READABLE)
    }),
    subclass::Property("desc", |name| {
        ParamSpec::string(name, "deprecated", "deprecated", None, ParamFlags::READABLE)
    }),
    subclass::Property("metadata", |name| {
        ParamSpec::string(name, "deprecated", "deprecated", None, ParamFlags::READABLE)
    }),
];

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impl ObjectSubclass for CHandle {
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    const NAME: &'static str = "RsvgHandle";

    type ParentType = glib::Object;

    // We don't use subclass:simple::InstanceStruct and ClassStruct
    // because we need to maintain the respective _abi_padding of each
    // of RsvgHandleClass and RsvgHandle.

    type Instance = RsvgHandle;
    type Class = RsvgHandleClass;

    glib_object_subclass!();

    fn class_init(klass: &mut RsvgHandleClass) {
        klass.install_properties(&PROPERTIES);
    }

    fn new() -> Self {
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        CHandle {
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            dpi: Cell::new(Dpi::default()),
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            load_flags: Cell::new(LoadFlags::default()),
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            base_url: RefCell::new(None),
            base_url_cstring: RefCell::new(None),
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            size_callback: RefCell::new(SizeCallback::default()),
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            is_testing: Cell::new(false),
            load_state: RefCell::new(LoadState::Start),
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        }
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    }
}

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impl ObjectImpl for CHandle {
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    glib_object_impl!();

    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
        let prop = &PROPERTIES[id];

        match *prop {
            subclass::Property("flags", ..) => {
                let v: HandleFlags = value.get().expect("flags value has incorrect type");
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                self.load_flags.set(LoadFlags::from(v));
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            }

            subclass::Property("dpi-x", ..) => {
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                let dpi_x: f64 = value.get().expect("dpi-x value has incorrect type");
                self.dpi.set(Dpi::new(dpi_x, self.dpi.get().y()));
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            }

            subclass::Property("dpi-y", ..) => {
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                let dpi_y: f64 = value.get().expect("dpi-y value has incorrect type");
                self.dpi.set(Dpi::new(self.dpi.get().x(), dpi_y));
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            }

            subclass::Property("base-uri", ..) => {
                let v: Option<String> = value.get();

                // rsvg_handle_set_base_uri() expects non-NULL URI strings,
                // but the "base-uri" property can be set to NULL due to a missing
                // construct-time property.

                if let Some(s) = v {
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                    self.set_base_url(&s);
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                }
            }

            _ => unreachable!("invalid property id {}", id),
        }
    }

    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
        let prop = &PROPERTIES[id];

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        let size_callback = self.size_callback.borrow();

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        match *prop {
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            subclass::Property("flags", ..) => {
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                let flags = HandleFlags::from(self.load_flags.get());
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                Ok(flags.to_value())
            }

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            subclass::Property("dpi-x", ..) => Ok(self.dpi.get().x().to_value()),
            subclass::Property("dpi-y", ..) => Ok(self.dpi.get().y().to_value()),
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            subclass::Property("base-uri", ..) => Ok(self
                .base_url
                .borrow()
                .as_ref()
                .map(|url| url.as_str())
                .to_value()),

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            subclass::Property("width", ..) => Ok(self
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                .get_handle_ref()
                .unwrap()
                .get_dimensions_no_error(self.dpi.get(), &*size_callback, self.is_testing.get())
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                .width
                .to_value()),
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            subclass::Property("height", ..) => Ok(self
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                .get_handle_ref()
                .unwrap()
                .get_dimensions_no_error(self.dpi.get(), &*size_callback, self.is_testing.get())
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                .height
                .to_value()),
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            subclass::Property("em", ..) => Ok(self
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                .get_handle_ref()
                .unwrap()
                .get_dimensions_no_error(self.dpi.get(), &*size_callback, self.is_testing.get())
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                .em
                .to_value()),
            subclass::Property("ex", ..) => Ok(self
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                .get_handle_ref()
                .unwrap()
                .get_dimensions_no_error(self.dpi.get(), &*size_callback, self.is_testing.get())
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                .ex
                .to_value()),
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            // the following three are deprecated
            subclass::Property("title", ..) => Ok((None as Option<String>).to_value()),
            subclass::Property("desc", ..) => Ok((None as Option<String>).to_value()),
            subclass::Property("metadata", ..) => Ok((None as Option<String>).to_value()),

            _ => unreachable!("invalid property id={} for RsvgHandle", id),
        }
    }
}

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impl CHandle {
    fn set_base_url(&self, url: &str) {
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        let mut state = self.load_state.borrow();

        match *state {
            LoadState::Start => (),
            _ => panic!("Please set the base file or URI before loading any data into RsvgHandle",),
        }
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        match Url::parse(&url) {
            Ok(u) => {
                let url_cstring = CString::new(u.as_str()).unwrap();

                rsvg_log!("setting base_uri to \"{}\"", u.as_str());
                *self.base_url.borrow_mut() = Some(u);
                *self.base_url_cstring.borrow_mut() = Some(url_cstring);
            }

            Err(e) => {
                rsvg_log!(
                    "not setting base_uri to \"{}\" since it is invalid: {}",
                    url,
                    e
                );
            }
        }
    }

    pub fn set_base_gfile(&self, file: &gio::File) {
        if let Some(uri) = file.get_uri() {
            self.set_base_url(&uri);
        } else {
            panic!("file has no URI; will not set the base URI");
        }
    }

    pub fn get_base_url_as_ptr(&self) -> *const libc::c_char {
        match *self.base_url_cstring.borrow() {
            None => ptr::null(),
            Some(ref url) => url.as_ptr(),
        }
    }

    fn load_options(&self) -> LoadOptions {
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        let flags = self.load_flags.get();
        LoadOptions::new(self.base_url.borrow().clone())
            .with_unlimited_size(flags.unlimited_size)
            .keep_image_data(flags.keep_image_data)
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    }
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    pub fn set_size_callback(
        &self,
        size_func: RsvgSizeFunc,
        user_data: glib_sys::gpointer,
        destroy_notify: glib_sys::GDestroyNotify,
    ) {
        *self.size_callback.borrow_mut() = SizeCallback {
            size_func,
            user_data,
            destroy_notify,
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            in_loop: Cell::new(false),
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        };
    }
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    fn write(&self, buf: &[u8]) {
        let mut state = self.load_state.borrow_mut();

        match *state {
            LoadState::Start => {
                *state = LoadState::Loading {
                    buffer: Vec::from(buf),
                }
            }

            LoadState::Loading { ref mut buffer } => {
                buffer.extend_from_slice(buf);
            }

            _ => panic!("Handle must not be closed in order to write to it"),
        }
    }

    fn close(&self) -> Result<(), LoadingError> {
        let mut state = self.load_state.borrow_mut();

        match *state {
            LoadState::Start => {
                *state = LoadState::ClosedError;
                Err(LoadingError::NoDataPassedToParser)
            }

            LoadState::Loading { ref buffer } => {
                let bytes = Bytes::from(&*buffer);
                let stream = gio::MemoryInputStream::new_from_bytes(&bytes);

                self.read_stream(state, &stream.upcast(), None)
            }

            // Closing is idempotent
            LoadState::ClosedOk { .. } => Ok(()),
            LoadState::ClosedError => Ok(()),
        }
    }

    fn read_stream_sync(
        &self,
        stream: &gio::InputStream,
        cancellable: Option<&gio::Cancellable>,
    ) -> Result<(), LoadingError> {
        let state = self.load_state.borrow_mut();

        match *state {
            LoadState::Start => self.read_stream(state, stream, cancellable),
            LoadState::Loading { .. } | LoadState::ClosedOk { .. } | LoadState::ClosedError => {
                panic!(
                "handle must not be already loaded in order to call rsvg_handle_read_stream_sync()",
            )
            }
        }
    }

    fn read_stream(
        &self,
        mut load_state: RefMut<LoadState>,
        stream: &gio::InputStream,
        cancellable: Option<&gio::Cancellable>,
    ) -> Result<(), LoadingError> {
        match Handle::from_stream(&self.load_options(), stream, cancellable) {
            Ok(handle) => {
                *load_state = LoadState::ClosedOk { handle };
                Ok(())
            }

            Err(e) => {
                *load_state = LoadState::ClosedError;
                Err(e)
            }
        }
    }

    fn get_handle_ref(&self) -> Result<Ref<Handle>, RenderingError> {
        let state = self.load_state.borrow();

        match *state {
            LoadState::Start => {
                rsvg_g_warning("Handle has not been loaded");
                Err(RenderingError::HandleIsNotLoaded)
            }

            LoadState::Loading { .. } => {
                rsvg_g_warning("Handle is still loading; call rsvg_handle_close() first");
                Err(RenderingError::HandleIsNotLoaded)
            }

            LoadState::ClosedError => {
                rsvg_g_warning(
                    "Handle could not read or parse the SVG; did you check for errors during \
                     the loading stage?",
                );
                Err(RenderingError::HandleIsNotLoaded)
            }

            LoadState::ClosedOk { .. } => Ok(Ref::map(state, |s| match *s {
                LoadState::ClosedOk { ref handle } => handle,
                _ => unreachable!(),
            })),
        }
    }

    fn has_sub(&self, id: &str) -> Result<bool, RenderingError> {
        let handle = self.get_handle_ref()?;
        handle.has_sub(id)
    }

    fn get_dimensions(&self) -> RsvgDimensionData {
        if let Ok(handle) = self.get_handle_ref() {
            let size_callback = self.size_callback.borrow();
            handle.get_dimensions_no_error(self.dpi.get(), &*size_callback, self.is_testing.get())
        } else {
            panic!("Handle is not loaded");
        }
    }

    fn get_dimensions_sub(&self, id: Option<&str>) -> Result<RsvgDimensionData, RenderingError> {
        let handle = self.get_handle_ref()?;
        let size_callback = self.size_callback.borrow();
        handle.get_dimensions_sub(id, self.dpi.get(), &*size_callback, self.is_testing.get())
    }

    fn get_position_sub(&self, id: Option<&str>) -> Result<RsvgPositionData, RenderingError> {
        let handle = self.get_handle_ref()?;
        let size_callback = self.size_callback.borrow();
        handle.get_position_sub(id, self.dpi.get(), &*size_callback, self.is_testing.get())
    }

    fn render_cairo_sub(
        &self,
        cr: &cairo::Context,
        id: Option<&str>,
    ) -> Result<(), RenderingError> {
        let handle = self.get_handle_ref()?;
        let size_callback = self.size_callback.borrow();
        handle.render_cairo_sub(
            cr,
            id,
            self.dpi.get(),
            &*size_callback,
            self.is_testing.get(),
        )
    }

    fn get_pixbuf_sub(&self, id: Option<&str>) -> Result<Pixbuf, RenderingError> {
        let handle = self.get_handle_ref()?;
        let size_callback = self.size_callback.borrow();
        handle.get_pixbuf_sub(id, self.dpi.get(), &*size_callback, self.is_testing.get())
    }

    fn get_geometry_for_element(
        &self,
        id: Option<&str>,
        viewport: &cairo::Rectangle,
    ) -> Result<(RsvgRectangle, RsvgRectangle), RenderingError> {
        let handle = self.get_handle_ref()?;
        handle.get_geometry_for_element(id, viewport, self.dpi.get(), self.is_testing.get())
    }

    fn get_intrinsic_dimensions(&self) -> IntrinsicDimensions {
        let handle = self.get_handle_ref().unwrap();
        handle.get_intrinsic_dimensions()
    }

    fn set_testing(&self, is_testing: bool) {
        self.is_testing.set(is_testing);
    }
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}

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pub fn get_rust_handle<'a>(handle: *const RsvgHandle) -> &'a CHandle {
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    let handle = unsafe { &*handle };
    handle.get_impl()
}

#[no_mangle]
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pub unsafe extern "C" fn rsvg_rust_handle_get_type() -> glib_sys::GType {
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    CHandle::get_type().to_glib()
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}
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#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_error_get_type() -> glib_sys::GType {
    static ONCE: Once = Once::new();
    static mut ETYPE: glib_sys::GType = gobject_sys::G_TYPE_INVALID;

    // We have to store the GEnumValue in a static variable but
    // that requires it to be Sync. It is not Sync by default
    // because it contains pointers, so we have define a custom
    // wrapper type here on which we can implement Sync.
    #[repr(transparent)]
    struct GEnumValueWrapper(GEnumValue);
    unsafe impl Sync for GEnumValueWrapper {}

    static VALUES: [GEnumValueWrapper; 2] = [
        GEnumValueWrapper(GEnumValue {
            value: RSVG_ERROR_FAILED,
            value_name: b"RSVG_ERROR_FAILED\0" as *const u8 as *const _,
            value_nick: b"failed\0" as *const u8 as *const _,
        }),
        GEnumValueWrapper(GEnumValue {
            value: 0,
            value_name: 0 as *const _,
            value_nick: 0 as *const _,
        }),
    ];

    ONCE.call_once(|| {
        ETYPE = gobject_sys::g_enum_register_static(
            b"RsvgError\0" as *const u8 as *const _,
            &VALUES as *const GEnumValueWrapper as *const GEnumValue,
        );
    });

    ETYPE
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_flags_get_type() -> glib_sys::GType {
    static ONCE: Once = Once::new();
    static mut FTYPE: glib_sys::GType = gobject_sys::G_TYPE_INVALID;

    // We have to store the GFlagsValue in a static variable but
    // that requires it to be Sync. It is not Sync by default
    // because it contains pointers, so we have define a custom
    // wrapper type here on which we can implement Sync.
    #[repr(transparent)]
    struct GFlagsValueWrapper(GFlagsValue);
    unsafe impl Sync for GFlagsValueWrapper {}

    static VALUES: [GFlagsValueWrapper; 4] = [
        GFlagsValueWrapper(GFlagsValue {
            value: 0, // handle_flags::HandleFlags::NONE.bits(),
            value_name: b"RSVG_HANDLE_FLAGS_NONE\0" as *const u8 as *const _,
            value_nick: b"flags-none\0" as *const u8 as *const _,
        }),
        GFlagsValueWrapper(GFlagsValue {
            value: 1 << 0, // HandleFlags::UNLIMITED.to_glib(),
            value_name: b"RSVG_HANDLE_FLAG_UNLIMITED\0" as *const u8 as *const _,
            value_nick: b"flag-unlimited\0" as *const u8 as *const _,
        }),
        GFlagsValueWrapper(GFlagsValue {
            value: 1 << 1, // HandleFlags::KEEP_IMAGE_DATA.to_glib(),
            value_name: b"RSVG_HANDLE_FLAG_KEEP_IMAGE_DATA\0" as *const u8 as *const _,
            value_nick: b"flag-keep-image-data\0" as *const u8 as *const _,
        }),
        GFlagsValueWrapper(GFlagsValue {
            value: 0,
            value_name: 0 as *const _,
            value_nick: 0 as *const _,
        }),
    ];

    ONCE.call_once(|| {
        FTYPE = gobject_sys::g_flags_register_static(
            b"RsvgHandleFlags\0" as *const u8 as *const _,
            &VALUES as *const GFlagsValueWrapper as *const GFlagsValue,
        );
    });

    FTYPE
}
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#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_base_url(
    raw_handle: *const RsvgHandle,
    uri: *const libc::c_char,
) {
    let rhandle = get_rust_handle(raw_handle);

    assert!(!uri.is_null());
    let uri: String = from_glib_none(uri);

815
    rhandle.set_base_url(&uri);
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_base_gfile(
    raw_handle: *const RsvgHandle,
    raw_gfile: *mut gio_sys::GFile,
) {
    let rhandle = get_rust_handle(raw_handle);

    assert!(!raw_gfile.is_null());

    let file: gio::File = from_glib_none(raw_gfile);

829
    rhandle.set_base_gfile(&file);
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_base_url(
    raw_handle: *const RsvgHandle,
) -> *const libc::c_char {
    let rhandle = get_rust_handle(raw_handle);

838
    rhandle.get_base_url_as_ptr()
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_dpi_x(raw_handle: *const RsvgHandle, dpi_x: f64) {
    let rhandle = get_rust_handle(raw_handle);

845
    rhandle.dpi.set(Dpi::new(dpi_x, rhandle.dpi.get().y()));
846 847 848 849 850 851
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_dpi_x(raw_handle: *const RsvgHandle) -> f64 {
    let rhandle = get_rust_handle(raw_handle);

852
    rhandle.dpi.get().x()
853 854 855 856 857 858
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_dpi_y(raw_handle: *const RsvgHandle, dpi_y: f64) {
    let rhandle = get_rust_handle(raw_handle);

859
    rhandle.dpi.set(Dpi::new(rhandle.dpi.get().x(), dpi_y));
860 861 862 863 864 865
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_dpi_y(raw_handle: *const RsvgHandle) -> f64 {
    let rhandle = get_rust_handle(raw_handle);

866
    rhandle.dpi.get().y()
867 868 869 870 871 872 873 874
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_flags(
    raw_handle: *const RsvgHandle,
) -> RsvgHandleFlags {
    let rhandle = get_rust_handle(raw_handle);

875
    HandleFlags::from(rhandle.load_flags.get()).to_glib()
876 877 878 879 880 881 882 883 884
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_flags(
    raw_handle: *const RsvgHandle,
    flags: RsvgHandleFlags,
) {
    let rhandle = get_rust_handle(raw_handle);

885
    let flags: HandleFlags = from_glib(flags);
886
    rhandle.load_flags.set(LoadFlags::from(flags));
887 888 889 890 891 892 893 894 895 896 897
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_size_callback(
    raw_handle: *const RsvgHandle,
    size_func: RsvgSizeFunc,
    user_data: glib_sys::gpointer,
    destroy_notify: glib_sys::GDestroyNotify,
) {
    let rhandle = get_rust_handle(raw_handle);

898
    rhandle.set_size_callback(size_func, user_data, destroy_notify);
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_set_testing(
    raw_handle: *const RsvgHandle,
    testing: glib_sys::gboolean,
) {
    let rhandle = get_rust_handle(raw_handle);

908
    rhandle.set_testing(from_glib(testing));
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_read_stream_sync(
    handle: *const RsvgHandle,
    stream: *mut gio_sys::GInputStream,
    cancellable: *mut gio_sys::GCancellable,
    error: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

920
    let stream = gio::InputStream::from_glib_none(stream);
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    let cancellable: Option<gio::Cancellable> = from_glib_none(cancellable);

923
    match rhandle.read_stream_sync(&stream, cancellable.as_ref()) {
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        Ok(()) => true.to_glib(),

        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            false.to_glib()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_write(
    handle: *const RsvgHandle,
    buf: *const u8,
    count: usize,
) {
    let rhandle = get_rust_handle(handle);
    let buffer = slice::from_raw_parts(buf, count);
941
    rhandle.write(buffer);
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_close(
    handle: *const RsvgHandle,
    error: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

951
    match rhandle.close() {
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        Ok(()) => true.to_glib(),

        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            false.to_glib()
        }
    }
}
#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_has_sub(
    handle: *const RsvgHandle,
    id: *const libc::c_char,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

    if id.is_null() {
        return false.to_glib();
    }

    let id: String = from_glib_none(id);
    // FIXME: return a proper error code to the public API
973
    rhandle.has_sub(&id).unwrap_or(false).to_glib()
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}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_render_cairo_sub(
    handle: *const RsvgHandle,
    cr: *mut cairo_sys::cairo_t,
    id: *const libc::c_char,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);
    let cr = from_glib_none(cr);
    let id: Option<String> = from_glib_none(id);

986
    match rhandle.render_cairo_sub(&cr, id.as_ref().map(String::as_str)) {
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        Ok(()) => true.to_glib(),

        Err(_) => {
            // FIXME: return a proper error code to the public API
            false.to_glib()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_pixbuf_sub(
    handle: *const RsvgHandle,
    id: *const libc::c_char,
) -> *mut gdk_pixbuf_sys::GdkPixbuf {
    let rhandle = get_rust_handle(handle);
    let id: Option<String> = from_glib_none(id);

1004
    match rhandle.get_pixbuf_sub(id.as_ref().map(String::as_str)) {
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        Ok(pixbuf) => pixbuf.to_glib_full(),
        Err(_) => ptr::null_mut(),
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_dimensions(
    handle: *const RsvgHandle,
    dimension_data: *mut RsvgDimensionData,
) {
    let rhandle = get_rust_handle(handle);
1016
    *dimension_data = rhandle.get_dimensions();
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_dimensions_sub(
    handle: *const RsvgHandle,
    dimension_data: *mut RsvgDimensionData,
    id: *const libc::c_char,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

    let id: Option<String> = from_glib_none(id);

1029
    match rhandle.get_dimensions_sub(id.as_ref().map(String::as_str)) {
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        Ok(dimensions) => {
            *dimension_data = dimensions;
            true.to_glib()
        }

        Err(_) => {
            let d = &mut *dimension_data;

            d.width = 0;
            d.height = 0;
            d.em = 0.0;
            d.ex = 0.0;

            // FIXME: return a proper error code to the public API
            false.to_glib()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_position_sub(
    handle: *const RsvgHandle,
    position_data: *mut RsvgPositionData,
    id: *const libc::c_char,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

    let id: Option<String> = from_glib_none(id);

1059
    match rhandle.get_position_sub(id.as_ref().map(String::as_str)) {
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
        Ok(position) => {
            *position_data = position;
            true.to_glib()
        }

        Err(_) => {
            let p = &mut *position_data;

            p.x = 0;
            p.y = 0;

            // FIXME: return a proper error code to the public API
            false.to_glib()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_new_with_flags(flags: u32) -> *const RsvgHandle {
    let obj: *mut gobject_sys::GObject =
1080
        glib::Object::new(CHandle::get_type(), &[("flags", &flags)])
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
            .unwrap()
            .to_glib_full();

    obj as *mut _
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_new_from_file(
    filename: *const libc::c_char,
    error: *mut *mut glib_sys::GError,
) -> *const RsvgHandle {
1092 1093
    let file = match PathOrUrl::new(filename) {
        Ok(PathOrUrl::Path(path)) => gio::File::new_for_path(path),
1094

1095
        Ok(PathOrUrl::Url(url)) => gio::File::new_for_uri(url.as_str()),
1096

1097 1098 1099 1100 1101
        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            return ptr::null_mut();
        }
    };
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116

    rsvg_rust_handle_new_from_gfile_sync(file.to_glib_none().0, 0, ptr::null_mut(), error)
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_new_from_gfile_sync(
    file: *mut gio_sys::GFile,
    flags: u32,
    cancellable: *mut gio_sys::GCancellable,
    error: *mut *mut glib_sys::GError,
) -> *const RsvgHandle {
    let raw_handle = rsvg_rust_handle_new_with_flags(flags);

    let rhandle = get_rust_handle(raw_handle);

1117
    let file = gio::File::from_glib_none(file);
1118 1119
    rhandle.set_base_gfile(&file);

1120 1121
    let cancellable: Option<gio::Cancellable> = from_glib_none(cancellable);

1122 1123 1124
    let res = file
        .read(cancellable.as_ref())
        .map_err(|e| LoadingError::from(e))
1125
        .and_then(|stream| rhandle.read_stream_sync(&stream.upcast(), cancellable.as_ref()));
1126 1127

    match res {
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
        Ok(()) => raw_handle,

        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            gobject_sys::g_object_unref(raw_handle as *mut _);
            ptr::null_mut()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_new_from_stream_sync(
    input_stream: *mut gio_sys::GInputStream,
    base_file: *mut gio_sys::GFile,
    flags: u32,
    cancellable: *mut gio_sys::GCancellable,
    error: *mut *mut glib_sys::GError,
) -> *const RsvgHandle {
    let raw_handle = rsvg_rust_handle_new_with_flags(flags);

    let rhandle = get_rust_handle(raw_handle);

    let base_file: Option<gio::File> = from_glib_none(base_file);
1151 1152 1153 1154
    if let Some(base_file) = base_file {
        rhandle.set_base_gfile(&base_file);
    }

1155
    let stream: gio::InputStream = from_glib_none(input_stream);
1156 1157
    let cancellable: Option<gio::Cancellable> = from_glib_none(cancellable);

1158
    match rhandle.read_stream_sync(&stream, cancellable.as_ref()) {
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
        Ok(()) => raw_handle,

        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            gobject_sys::g_object_unref(raw_handle as *mut _);
            ptr::null_mut()
        }
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_new_from_data(
    data: *mut u8,
    len: usize,
    error: *mut *mut glib_sys::GError,
) -> *const RsvgHandle {
    // We create the MemoryInputStream without the gtk-rs binding because of this:
    //
    // - The binding doesn't provide _new_from_data().  All of the binding's ways to
    // put data into a MemoryInputStream involve copying the data buffer.
    //
    // - We can't use glib::Bytes from the binding either, for the same reason.
    //
    // - For now, we are using the other C-visible constructor, so we need a raw pointer to the
    //   stream, anyway.

    assert!(len <= std::isize::MAX as usize);
    let len = len as isize;

    let raw_stream = gio_sys::g_memory_input_stream_new_from_data(data, len, None);

    let ret = rsvg_rust_handle_new_from_stream_sync(
        raw_stream as *mut _,
        ptr::null_mut(), // base_file
        0,               // flags
        ptr::null_mut(), // cancellable
        error,
    );

    gobject_sys::g_object_unref(raw_stream as *mut _);
    ret
}

unsafe fn set_out_param<T: Copy>(
    out_has_param: *mut glib_sys::gboolean,
    out_param: *mut T,
    value: &Option<T>,
) {
    let has_value = if let Some(ref v) = *value {
        if !out_param.is_null() {
            *out_param = *v;
        }

        true
    } else {
        false
    };

    if !out_has_param.is_null() {
        *out_has_param = has_value.to_glib();
    }
}

#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_intrinsic_dimensions(
    handle: *mut RsvgHandle,
    out_has_width: *mut glib_sys::gboolean,
    out_width: *mut RsvgLength,
    out_has_height: *mut glib_sys::gboolean,
    out_height: *mut RsvgLength,
    out_has_viewbox: *mut glib_sys::gboolean,
    out_viewbox: *mut RsvgRectangle,
) {
    let rhandle = get_rust_handle(handle);

1234
    let d = rhandle.get_intrinsic_dimensions();
1235 1236

    let w = d.width.map(|l| l.to_length());
1237
    let h = d.height.map(|l| l.to_length());
1238 1239 1240 1241 1242 1243
    let r = d.vbox.map(RsvgRectangle::from);

    set_out_param(out_has_width, out_width, &w);
    set_out_param(out_has_height, out_height, &h);
    set_out_param(out_has_viewbox, out_viewbox, &r);
}
1244

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
#[no_mangle]
pub unsafe extern "C" fn rsvg_rust_handle_get_geometry_for_element(
    handle: *mut RsvgHandle,
    id: *const libc::c_char,
    viewport: RsvgRectangle,
    out_ink_rect: *mut RsvgRectangle,
    out_logical_rect: *mut RsvgRectangle,
    error: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean {
    let rhandle = get_rust_handle(handle);

    let id: Option<String> = from_glib_none(id);

1258
    match rhandle.get_geometry_for_element(id.as_ref().map(String::as_str), &viewport.into()) {
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
        Ok((ink_rect, logical_rect)) => {
            if !out_ink_rect.is_null() {
                *out_ink_rect = ink_rect;
            }

            if !out_logical_rect.is_null() {
                *out_logical_rect = logical_rect;
            }

            true.to_glib()
1269
        }
1270 1271 1272 1273 1274 1275 1276 1277

        Err(e) => {
            set_gerror(error, 0, &format!("{}", e));
            false.to_glib()
        }
    }
}

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/// Detects whether a `*const libc::c_char` is a path or a URI
///
/// `rsvg_handle_new_from_file()` takes a `filename` argument, and advertises
/// that it will detect either a file system path, or a proper URI.  It will then use
/// `gio::File::new_for_path()` or `gio::File::new_for_uri()` as appropriate.
///
/// This enum does the magic heuristics to figure this out.
enum PathOrUrl {
    Path(PathBuf),
    Url(Url),
}

impl PathOrUrl {
    unsafe fn new(s: *const libc::c_char) -> Result<PathOrUrl, LoadingError> {
        let cstr = CStr::from_ptr(s);

        Ok(cstr
            .to_str()
            .map_err(|_| ())
            .and_then(|utf8| Url::parse(utf8).map_err(|_| ()))
            .and_then(|url| {
                if url.origin().is_tuple() || url.scheme() == "file" {
                    Ok(PathOrUrl::Url(url))
                } else {
                    Ok(PathOrUrl::Path(url.to_file_path()?))
                }
            })
            .unwrap_or_else(|_| PathOrUrl::Path(PathBuf::from_glib_none(s))))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn path_or_url_unix() {
        unsafe {
            match PathOrUrl::new(b"/foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Path(_) => (),
                _ => panic!("unix filename should be a PathOrUrl::Path"),
            }

            match PathOrUrl::new(b"foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Path(_) => (),
                _ => panic!("unix filename should be a PathOrUrl::Path"),
            }
        }
    }

    #[test]
    fn path_or_url_windows() {
        unsafe {
            match PathOrUrl::new(b"c:/foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Path(_) => (),
                _ => panic!("windows filename should be a PathOrUrl::Path"),
            }

            match PathOrUrl::new(b"C:/foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Path(_) => (),
                _ => panic!("windows filename should be a PathOrUrl::Path"),
            }
        }
    }

    #[test]
    fn path_or_url_unix_url() {
        unsafe {
            match PathOrUrl::new(b"file:///foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Url(_) => (),
                _ => panic!("file:// unix filename should be a PathOrUrl::Url"),
            }
        }
    }

    #[test]
    fn path_or_url_windows_url() {
        unsafe {
            match PathOrUrl::new(b"file://c:/foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Url(_) => (),
                _ => panic!("file:// windows filename should be a PathOrUrl::Url"),
            }

            match PathOrUrl::new(b"file://C:/foo/bar\0" as *const u8 as *const _).unwrap() {
                PathOrUrl::Url(_) => (),
                _ => panic!("file:// windows filename should be a PathOrUrl::Url"),
            }
        }
    }
}