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use std::convert::TryFrom;
use std::ops::{Deref, DerefMut};
use std::rc::Rc;
use std::slice;
use enums::{Format, SurfaceType};
use error::Error;
use ffi;
#[cfg(feature = "use_glib")]
use glib::translate::*;
use std::fmt;
use surface::Surface;
use utils::status_to_result;
use BorrowError;
declare_surface!(ImageSurface, SurfaceType::Image);
impl ImageSurface {
pub fn create(format: Format, width: i32, height: i32) -> Result<ImageSurface, Error> {
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, Error> {
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();
let status = ffi::cairo_surface_status(self.to_raw_none());
if let Some(err) = status_to_result(status).err() {
return Err(BorrowError::from(err));
}
if ffi::cairo_image_surface_get_data(self.to_raw_none()).is_null() || is_finished(self)
{
return Err(BorrowError::from(Error::SurfaceFinished));
}
Ok(ImageSurfaceData::new(self))
}
}
pub fn with_data<F: FnOnce(&[u8])>(&self, f: F) -> Result<(), BorrowError> {
self.flush();
unsafe {
let status = ffi::cairo_surface_status(self.to_raw_none());
if let Some(err) = status_to_result(status).err() {
return Err(BorrowError::from(err));
}
let ptr = ffi::cairo_image_surface_get_data(self.to_raw_none());
if ptr.is_null() || is_finished(self) {
return Err(BorrowError::from(Error::SurfaceFinished));
}
let len = self.get_height() as usize * self.get_stride() as usize;
f(slice::from_raw_parts(ptr, len));
}
Ok(())
}
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()) }
}
}
#[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 {
self.surface.mark_dirty()
}
}
}
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")
}
}
fn is_finished(surface: &ImageSurface) -> bool {
use super::Context;
let ctxt = Context::new(surface);
ctxt.status().is_err()
}
#[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());
}
#[test]
fn no_crash_after_finish() {
let mut surf = ImageSurface::create(Format::ARgb32, 1024, 1024).unwrap();
surf.finish();
assert!(surf.get_data().is_err());
}
}