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use png;
use predicates::prelude::*;
use predicates::reflection::{Case, Child, PredicateReflection, Product};
use std::fmt;
use std::io::BufReader;
use std::path::{Path, PathBuf};
use rsvg::surface_utils::shared_surface::{SharedImageSurface, SurfaceType};
use rsvg::test_utils::compare_surfaces::BufferDiff;
use rsvg::test_utils::reference_utils::{surface_from_png, Compare, Deviation, Reference};
/// Checks that the variable of type [u8] can be parsed as a PNG file.
#[derive(Debug)]
pub struct PngPredicate {}
impl PngPredicate {
pub fn with_size(self: Self, w: u32, h: u32) -> SizePredicate<Self> {
SizePredicate::<Self> { p: self, w, h }
}
pub fn with_contents<P: AsRef<Path>>(self: Self, reference: P) -> ReferencePredicate<Self> {
let mut path = PathBuf::new();
path.push(reference);
ReferencePredicate::<Self> { p: self, path }
}
}
impl Predicate<[u8]> for PngPredicate {
fn eval(&self, data: &[u8]) -> bool {
let decoder = png::Decoder::new(data);
decoder.read_info().is_ok()
}
fn find_case<'a>(&'a self, _expected: bool, data: &[u8]) -> Option<Case<'a>> {
let decoder = png::Decoder::new(data);
match decoder.read_info() {
Ok(_) => None,
Err(e) => Some(Case::new(Some(self), false).add_product(Product::new("Error", e))),
}
}
}
impl PredicateReflection for PngPredicate {}
impl fmt::Display for PngPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "is a PNG")
}
}
/// Extends a PngPredicate by a check for a given size of the PNG file.
#[derive(Debug)]
pub struct SizePredicate<PngPredicate> {
p: PngPredicate,
w: u32,
h: u32,
}
impl SizePredicate<PngPredicate> {
fn eval_info(&self, info: &png::Info) -> bool {
info.width == self.w && info.height == self.h
}
fn find_case_for_info<'a>(&'a self, expected: bool, info: &png::Info) -> Option<Case<'a>> {
if self.eval_info(info) == expected {
let product = self.product_for_info(info);
Some(Case::new(Some(self), false).add_product(product))
} else {
None
}
}
fn product_for_info(&self, info: &png::Info) -> Product {
let actual_size = format!("{} x {}", info.width, info.height);
Product::new("actual size", actual_size)
}
}
impl Predicate<[u8]> for SizePredicate<PngPredicate> {
fn eval(&self, data: &[u8]) -> bool {
let decoder = png::Decoder::new(data);
match decoder.read_info() {
Ok(reader) => self.eval_info(&reader.info()),
_ => false,
}
}
fn find_case<'a>(&'a self, expected: bool, data: &[u8]) -> Option<Case<'a>> {
let decoder = png::Decoder::new(data);
match decoder.read_info() {
Ok(reader) => self.find_case_for_info(expected, reader.info()),
Err(e) => Some(Case::new(Some(self), false).add_product(Product::new("Error", e))),
}
}
}
impl PredicateReflection for SizePredicate<PngPredicate> {
fn children<'a>(&'a self) -> Box<dyn Iterator<Item = Child<'a>> + 'a> {
let params = vec![Child::new("predicate", &self.p)];
Box::new(params.into_iter())
}
}
impl fmt::Display for SizePredicate<PngPredicate> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "is a PNG with size {} x {}", self.w, self.h)
}
}
/// Extends a PngPredicate by a comparison to the contents of a reference file
#[derive(Debug)]
pub struct ReferencePredicate<PngPredicate> {
p: PngPredicate,
path: PathBuf,
}
impl ReferencePredicate<PngPredicate> {
fn diff_acceptable(diff: &BufferDiff) -> bool {
match diff {
BufferDiff::DifferentSizes => false,
BufferDiff::Diff(diff) => !diff.inacceptable(),
}
}
fn diff_surface(&self, surface: &SharedImageSurface) -> Option<BufferDiff> {
let reference = Reference::from_png(&self.path)
.unwrap_or_else(|_| panic!("could not open {:?}", self.path));
if let Ok(diff) = reference.compare(&surface) {
if !Self::diff_acceptable(&diff) {
return Some(diff);
}
}
None
}
fn find_case_for_surface<'a>(
&'a self,
expected: bool,
surface: &SharedImageSurface,
) -> Option<Case<'a>> {
let diff = self.diff_surface(&surface);
if diff.is_some() != expected {
let product = self.product_for_diff(&diff.unwrap());
Some(Case::new(Some(self), false).add_product(product))
} else {
None
}
}
fn product_for_diff(&self, diff: &BufferDiff) -> Product {
let difference = format!("{}", diff);
Product::new("images differ", difference)
}
}
impl Predicate<[u8]> for ReferencePredicate<PngPredicate> {
fn eval(&self, data: &[u8]) -> bool {
if let Ok(surface) = surface_from_png(&mut BufReader::new(data)) {
let surface = SharedImageSurface::wrap(surface, SurfaceType::SRgb).unwrap();
self.diff_surface(&surface).is_some()
} else {
false
}
}
fn find_case<'a>(&'a self, expected: bool, data: &[u8]) -> Option<Case<'a>> {
match surface_from_png(&mut BufReader::new(data)) {
Ok(surface) => {
let surface = SharedImageSurface::wrap(surface, SurfaceType::SRgb).unwrap();
self.find_case_for_surface(expected, &surface)
}
Err(e) => Some(Case::new(Some(self), false).add_product(Product::new("Error", e))),
}
}
}
impl PredicateReflection for ReferencePredicate<PngPredicate> {
fn children<'a>(&'a self) -> Box<dyn Iterator<Item = Child<'a>> + 'a> {
let params = vec![Child::new("predicate", &self.p)];
Box::new(params.into_iter())
}
}
impl fmt::Display for ReferencePredicate<PngPredicate> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"is a PNG that matches the reference {}",
self.path.display()
)
}
}
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