87 lines
3 KiB
Rust
87 lines
3 KiB
Rust
/*
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* Copyright 2015-2017 Nathan Fiedler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//!
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//! "Safe" wrapper around the low-level bindings to ImageMagick.
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//!
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//! Prior to using the ImageMagick system, the application should invoke
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//! `magick_wand_genesis()`, which maps directly to `MagickWandGenesis`.
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//! Likewise, when an application is done using ImageMagick, invoke the
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//! `magick_wand_terminus()` function, which maps to `MagickWandTerminus`.
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//!
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// Make the Rust bindings compile cleanly, despite being very un-Rust-like
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// wrappers around C code.
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#![allow(dead_code)]
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#![allow(non_upper_case_globals)]
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#![allow(non_camel_case_types)]
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#![allow(non_snake_case)]
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#![allow(improper_ctypes)] // the siginfo_t in waitid() definition in bindings.rs
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extern crate libc;
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mod conversions;
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mod wand;
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include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
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pub use bindings::{
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ColorspaceType, CompositeOperator, DitherMethod, FilterType, GravityType, MetricType,
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};
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pub use conversions::ToMagick;
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pub use wand::*;
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use libc::size_t;
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#[cfg(not(target_os = "freebsd"))]
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use libc::ssize_t;
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/// This function must be called before any other ImageMagick operations
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/// are attempted. This function is safe to be called repeatedly.
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pub fn magick_wand_genesis() {
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unsafe {
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match bindings::IsMagickWandInstantiated() {
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bindings::MagickBooleanType_MagickTrue => (),
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_ => bindings::MagickWandGenesis(),
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}
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}
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}
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/// This function should be called when ImageMagick is no longer needed.
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/// This function is safe to be called repeatedly.
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pub fn magick_wand_terminus() {
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unsafe {
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if let bindings::MagickBooleanType_MagickTrue = bindings::IsMagickWandInstantiated() {
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bindings::MagickWandTerminus();
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}
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}
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}
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pub fn magick_query_fonts(pattern: &str) -> Result<Vec<String>, &'static str> {
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let mut number_fonts: size_t = 0;
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let c_string = ::std::ffi::CString::new(pattern).map_err(|_| "could not convert to cstring")?;
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let ptr =
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unsafe { bindings::MagickQueryFonts(c_string.as_ptr(), &mut number_fonts as *mut size_t) };
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if ptr.is_null() {
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Err("null ptr returned by magick_query_fonts")
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} else {
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let mut v = Vec::new();
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let c_str_ptr_slice = unsafe { ::std::slice::from_raw_parts(ptr, number_fonts as usize) };
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for c_str_ptr in c_str_ptr_slice {
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let c_str = unsafe { ::std::ffi::CStr::from_ptr(*c_str_ptr) };
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v.push(c_str.to_string_lossy().into_owned())
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}
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Ok(v)
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}
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}
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