use std::convert::TryFrom;
use std::ops::{Deref, DerefMut};
use std::rc::Rc;
use std::slice;
use enums::{Format, SurfaceType};
use ffi;
#[cfg(feature = "use_glib")]
use glib::translate::*;
use std::fmt;
use surface::Surface;
use BorrowError;
use Status;
#[derive(Debug)]
pub struct ImageSurface(Surface);
impl TryFrom<Surface> for ImageSurface {
type Error = Surface;
fn try_from(surface: Surface) -> Result<ImageSurface, Surface> {
if surface.get_type() == SurfaceType::Image {
Ok(ImageSurface(surface))
} else {
Err(surface)
}
}
}
impl ImageSurface {
pub unsafe fn from_raw_full(ptr: *mut ffi::cairo_surface_t) -> Result<ImageSurface, Status> {
let surface = Self::try_from(Surface::from_raw_full(ptr)).unwrap();
let status = surface.status();
match status {
Status::Success => Ok(surface),
_ => Err(status),
}
}
pub fn create(format: Format, width: i32, height: i32) -> Result<ImageSurface, Status> {
unsafe {
Self::from_raw_full(ffi::cairo_image_surface_create(
format.into(),
width,
height,
))
}
}
pub fn create_for_data<D: AsMut<[u8]> + 'static>(
data: D,
format: Format,
width: i32,
height: i32,
stride: i32,
) -> Result<ImageSurface, Status> {
let mut data: Box<dyn AsMut<[u8]>> = Box::new(data);
let (ptr, len) = {
let data: &mut [u8] = (*data).as_mut();
(data.as_mut_ptr(), data.len())
};
assert!(len >= (height * stride) as usize);
let result = unsafe {
ImageSurface::from_raw_full(ffi::cairo_image_surface_create_for_data(
ptr,
format.into(),
width,
height,
stride,
))
};
if let Ok(surface) = &result {
static IMAGE_SURFACE_DATA: crate::UserDataKey<Box<dyn AsMut<[u8]>>> =
crate::UserDataKey::new();
surface.set_user_data(&IMAGE_SURFACE_DATA, Rc::new(data))
}
result
}
pub fn get_data(&mut self) -> Result<ImageSurfaceData, BorrowError> {
unsafe {
if ffi::cairo_surface_get_reference_count(self.to_raw_none()) > 1 {
return Err(BorrowError::NonExclusive);
}
self.flush();
match self.status() {
Status::Success => (),
status => return Err(BorrowError::from(status)),
}
if ffi::cairo_image_surface_get_data(self.to_raw_none()).is_null() {
return Err(BorrowError::from(Status::SurfaceFinished));
}
Ok(ImageSurfaceData::new(self))
}
}
pub fn get_format(&self) -> Format {
unsafe { Format::from(ffi::cairo_image_surface_get_format(self.to_raw_none())) }
}
pub fn get_height(&self) -> i32 {
unsafe { ffi::cairo_image_surface_get_height(self.to_raw_none()) }
}
pub fn get_stride(&self) -> i32 {
unsafe { ffi::cairo_image_surface_get_stride(self.to_raw_none()) }
}
pub fn get_width(&self) -> i32 {
unsafe { ffi::cairo_image_surface_get_width(self.to_raw_none()) }
}
}
#[cfg(feature = "use_glib")]
impl<'a> ToGlibPtr<'a, *mut ffi::cairo_surface_t> for ImageSurface {
type Storage = &'a Surface;
#[inline]
fn to_glib_none(&'a self) -> Stash<'a, *mut ffi::cairo_surface_t, Self> {
let stash = self.0.to_glib_none();
Stash(stash.0, stash.1)
}
#[inline]
fn to_glib_full(&self) -> *mut ffi::cairo_surface_t {
unsafe { ffi::cairo_surface_reference(self.0.to_glib_none().0) }
}
}
#[cfg(feature = "use_glib")]
impl FromGlibPtrNone<*mut ffi::cairo_surface_t> for ImageSurface {
#[inline]
unsafe fn from_glib_none(ptr: *mut ffi::cairo_surface_t) -> ImageSurface {
Self::try_from(from_glib_none::<_, Surface>(ptr)).unwrap()
}
}
#[cfg(feature = "use_glib")]
impl FromGlibPtrBorrow<*mut ffi::cairo_surface_t> for ImageSurface {
#[inline]
unsafe fn from_glib_borrow(ptr: *mut ffi::cairo_surface_t) -> ImageSurface {
Self::try_from(from_glib_borrow::<_, Surface>(ptr)).unwrap()
}
}
#[cfg(feature = "use_glib")]
impl FromGlibPtrFull<*mut ffi::cairo_surface_t> for ImageSurface {
#[inline]
unsafe fn from_glib_full(ptr: *mut ffi::cairo_surface_t) -> ImageSurface {
Self::from_raw_full(ptr).unwrap()
}
}
#[cfg(feature = "use_glib")]
gvalue_impl!(
ImageSurface,
ffi::cairo_surface_t,
ffi::gobject::cairo_gobject_surface_get_type
);
impl Deref for ImageSurface {
type Target = Surface;
fn deref(&self) -> &Surface {
&self.0
}
}
impl Clone for ImageSurface {
fn clone(&self) -> ImageSurface {
ImageSurface(self.0.clone())
}
}
impl fmt::Display for ImageSurface {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ImageSurface")
}
}
#[derive(Debug)]
pub struct ImageSurfaceData<'a> {
surface: &'a mut ImageSurface,
slice: &'a mut [u8],
dirty: bool,
}
impl<'a> ImageSurfaceData<'a> {
fn new(surface: &'a mut ImageSurface) -> ImageSurfaceData<'a> {
unsafe {
let ptr = ffi::cairo_image_surface_get_data(surface.to_raw_none());
debug_assert!(!ptr.is_null());
let len = (surface.get_stride() as usize) * (surface.get_height() as usize);
ImageSurfaceData {
surface,
slice: slice::from_raw_parts_mut(ptr, len),
dirty: false,
}
}
}
}
impl<'a> Drop for ImageSurfaceData<'a> {
fn drop(&mut self) {
if self.dirty {
unsafe { ffi::cairo_surface_mark_dirty(self.surface.to_raw_none()) }
}
}
}
impl<'a> Deref for ImageSurfaceData<'a> {
type Target = [u8];
fn deref(&self) -> &[u8] {
self.slice
}
}
impl<'a> DerefMut for ImageSurfaceData<'a> {
fn deref_mut(&mut self) -> &mut [u8] {
self.dirty = true;
self.slice
}
}
impl<'a> fmt::Display for ImageSurfaceData<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ImageSurfaceData")
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn create_with_invalid_size_yields_error() {
let result = ImageSurface::create(Format::ARgb32, 50000, 50000);
assert!(result.is_err());
}
#[test]
fn create_for_data_with_invalid_stride_yields_error() {
let result = ImageSurface::create_for_data(vec![0u8; 10], Format::ARgb32, 1, 2, 5); assert!(result.is_err());
}
#[test]
fn create_with_valid_size() {
let result = ImageSurface::create(Format::ARgb32, 10, 10);
assert!(result.is_ok());
let result = ImageSurface::create_for_data(vec![0u8; 40 * 10], Format::ARgb32, 10, 10, 40);
assert!(result.is_ok());
}
}