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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//! C bindings.
#![allow(non_camel_case_types)]
#![warn(missing_docs)]
#![warn(missing_copy_implementations)]
use std::ffi::CStr;
use std::os::raw::c_char;
use std::slice;
use resvg::tiny_skia;
use resvg::usvg;
#[cfg(feature = "text")]
use resvg::usvg::fontdb;
/// @brief List of possible errors.
#[repr(C)]
#[derive(Copy, Clone)]
pub enum resvg_error {
/// Everything is ok.
OK = 0,
/// Only UTF-8 content are supported.
NOT_AN_UTF8_STR,
/// Failed to open the provided file.
FILE_OPEN_FAILED,
/// Compressed SVG must use the GZip algorithm.
MALFORMED_GZIP,
/// We do not allow SVG with more than 1_000_000 elements for security reasons.
ELEMENTS_LIMIT_REACHED,
/// SVG doesn't have a valid size.
///
/// Occurs when width and/or height are <= 0.
///
/// Also occurs if width, height and viewBox are not set.
INVALID_SIZE,
/// Failed to parse an SVG data.
PARSING_FAILED,
}
/// @brief A rectangle representation.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub struct resvg_rect {
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
}
/// @brief A size representation.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub struct resvg_size {
pub width: f32,
pub height: f32,
}
/// @brief A 2D transform representation.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub struct resvg_transform {
pub a: f32,
pub b: f32,
pub c: f32,
pub d: f32,
pub e: f32,
pub f: f32,
}
impl resvg_transform {
#[inline]
fn to_tiny_skia(&self) -> tiny_skia::Transform {
tiny_skia::Transform::from_row(self.a, self.b, self.c, self.d, self.e, self.f)
}
}
/// @brief Creates an identity transform.
#[no_mangle]
pub extern "C" fn resvg_transform_identity() -> resvg_transform {
resvg_transform {
a: 1.0,
b: 0.0,
c: 0.0,
d: 1.0,
e: 0.0,
f: 0.0,
}
}
/// @brief Initializes the library log.
///
/// Use it if you want to see any warnings.
///
/// Must be called only once.
///
/// All warnings will be printed to the `stderr`.
#[no_mangle]
pub extern "C" fn resvg_init_log() {
if let Ok(()) = log::set_logger(&LOGGER) {
log::set_max_level(log::LevelFilter::Warn);
}
}
/// @brief An SVG to #resvg_render_tree conversion options.
///
/// Also, contains a fonts database used during text to path conversion.
/// The database is empty by default.
pub struct resvg_options {
options: usvg::Options,
#[cfg(feature = "text")]
fontdb: fontdb::Database,
}
/// @brief Creates a new #resvg_options object.
///
/// Should be destroyed via #resvg_options_destroy.
#[no_mangle]
pub extern "C" fn resvg_options_create() -> *mut resvg_options {
Box::into_raw(Box::new(resvg_options {
options: usvg::Options::default(),
#[cfg(feature = "text")]
fontdb: fontdb::Database::new(),
}))
}
#[inline]
fn cast_opt(opt: *mut resvg_options) -> &'static mut usvg::Options {
unsafe {
assert!(!opt.is_null());
&mut (*opt).options
}
}
#[cfg(feature = "text")]
#[inline]
fn cast_fontdb(opt: *mut resvg_options) -> &'static mut fontdb::Database {
unsafe {
assert!(!opt.is_null());
&mut (*opt).fontdb
}
}
/// @brief Sets a directory that will be used during relative paths resolving.
///
/// Expected to be the same as the directory that contains the SVG file,
/// but can be set to any.
///
/// Must be UTF-8. Can be set to NULL.
///
/// Default: NULL
#[no_mangle]
pub extern "C" fn resvg_options_set_resources_dir(opt: *mut resvg_options, path: *const c_char) {
if path.is_null() {
cast_opt(opt).resources_dir = None;
} else {
cast_opt(opt).resources_dir = Some(cstr_to_str(path).unwrap().into());
}
}
/// @brief Sets the target DPI.
///
/// Impact units conversion.
///
/// Default: 96
#[no_mangle]
pub extern "C" fn resvg_options_set_dpi(opt: *mut resvg_options, dpi: f32) {
cast_opt(opt).dpi = dpi as f32;
}
/// @brief Sets the default font family.
///
/// Will be used when no `font-family` attribute is set in the SVG.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Default: Times New Roman
#[no_mangle]
pub extern "C" fn resvg_options_set_font_family(opt: *mut resvg_options, family: *const c_char) {
cast_opt(opt).font_family = cstr_to_str(family).unwrap().to_string();
}
/// @brief Sets the default font size.
///
/// Will be used when no `font-size` attribute is set in the SVG.
///
/// Default: 12
#[no_mangle]
pub extern "C" fn resvg_options_set_font_size(opt: *mut resvg_options, size: f32) {
cast_opt(opt).font_size = size;
}
/// @brief Sets the `serif` font family.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Has no effect when the `text` feature is not enabled.
///
/// Default: Times New Roman
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_set_serif_family(opt: *mut resvg_options, family: *const c_char) {
#[cfg(feature = "text")]
{
cast_fontdb(opt).set_serif_family(cstr_to_str(family).unwrap().to_string());
}
}
/// @brief Sets the `sans-serif` font family.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Has no effect when the `text` feature is not enabled.
///
/// Default: Arial
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_set_sans_serif_family(
opt: *mut resvg_options,
family: *const c_char,
) {
#[cfg(feature = "text")]
{
cast_fontdb(opt).set_sans_serif_family(cstr_to_str(family).unwrap().to_string());
}
}
/// @brief Sets the `cursive` font family.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Has no effect when the `text` feature is not enabled.
///
/// Default: Comic Sans MS
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_set_cursive_family(opt: *mut resvg_options, family: *const c_char) {
#[cfg(feature = "text")]
{
cast_fontdb(opt).set_cursive_family(cstr_to_str(family).unwrap().to_string());
}
}
/// @brief Sets the `fantasy` font family.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Has no effect when the `text` feature is not enabled.
///
/// Default: Papyrus on macOS, Impact on other OS'es
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_set_fantasy_family(opt: *mut resvg_options, family: *const c_char) {
#[cfg(feature = "text")]
{
cast_fontdb(opt).set_fantasy_family(cstr_to_str(family).unwrap().to_string());
}
}
/// @brief Sets the `monospace` font family.
///
/// Must be UTF-8. NULL is not allowed.
///
/// Has no effect when the `text` feature is not enabled.
///
/// Default: Courier New
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_set_monospace_family(
opt: *mut resvg_options,
family: *const c_char,
) {
#[cfg(feature = "text")]
{
cast_fontdb(opt).set_monospace_family(cstr_to_str(family).unwrap().to_string());
}
}
/// @brief Sets a comma-separated list of languages.
///
/// Will be used to resolve a `systemLanguage` conditional attribute.
///
/// Example: en,en-US.
///
/// Must be UTF-8. Can be NULL.
///
/// Default: en
#[no_mangle]
pub extern "C" fn resvg_options_set_languages(opt: *mut resvg_options, languages: *const c_char) {
if languages.is_null() {
cast_opt(opt).languages = Vec::new();
return;
}
let languages_str = match cstr_to_str(languages) {
Some(v) => v,
None => return,
};
let mut languages = Vec::new();
for lang in languages_str.split(',') {
languages.push(lang.trim().to_string());
}
cast_opt(opt).languages = languages;
}
/// @brief A shape rendering method.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub enum resvg_shape_rendering {
OPTIMIZE_SPEED,
CRISP_EDGES,
GEOMETRIC_PRECISION,
}
/// @brief Sets the default shape rendering method.
///
/// Will be used when an SVG element's `shape-rendering` property is set to `auto`.
///
/// Default: `RESVG_SHAPE_RENDERING_GEOMETRIC_PRECISION`
#[no_mangle]
pub extern "C" fn resvg_options_set_shape_rendering_mode(
opt: *mut resvg_options,
mode: resvg_shape_rendering,
) {
cast_opt(opt).shape_rendering = match mode as i32 {
0 => usvg::ShapeRendering::OptimizeSpeed,
1 => usvg::ShapeRendering::CrispEdges,
2 => usvg::ShapeRendering::GeometricPrecision,
_ => return,
}
}
/// @brief A text rendering method.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub enum resvg_text_rendering {
OPTIMIZE_SPEED,
OPTIMIZE_LEGIBILITY,
GEOMETRIC_PRECISION,
}
/// @brief Sets the default text rendering method.
///
/// Will be used when an SVG element's `text-rendering` property is set to `auto`.
///
/// Default: `RESVG_TEXT_RENDERING_OPTIMIZE_LEGIBILITY`
#[no_mangle]
pub extern "C" fn resvg_options_set_text_rendering_mode(
opt: *mut resvg_options,
mode: resvg_text_rendering,
) {
cast_opt(opt).text_rendering = match mode as i32 {
0 => usvg::TextRendering::OptimizeSpeed,
1 => usvg::TextRendering::OptimizeLegibility,
2 => usvg::TextRendering::GeometricPrecision,
_ => return,
}
}
/// @brief A image rendering method.
#[repr(C)]
#[allow(missing_docs)]
#[derive(Copy, Clone)]
pub enum resvg_image_rendering {
OPTIMIZE_QUALITY,
OPTIMIZE_SPEED,
}
/// @brief Sets the default image rendering method.
///
/// Will be used when an SVG element's `image-rendering` property is set to `auto`.
///
/// Default: `RESVG_IMAGE_RENDERING_OPTIMIZE_QUALITY`
#[no_mangle]
pub extern "C" fn resvg_options_set_image_rendering_mode(
opt: *mut resvg_options,
mode: resvg_image_rendering,
) {
cast_opt(opt).image_rendering = match mode as i32 {
0 => usvg::ImageRendering::OptimizeQuality,
1 => usvg::ImageRendering::OptimizeSpeed,
_ => return,
}
}
/// @brief Loads a font data into the internal fonts database.
///
/// Prints a warning into the log when the data is not a valid TrueType font.
///
/// Has no effect when the `text` feature is not enabled.
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_load_font_data(
opt: *mut resvg_options,
data: *const c_char,
len: usize,
) {
#[cfg(feature = "text")]
{
let data = unsafe { slice::from_raw_parts(data as *const u8, len) };
let opt = unsafe {
assert!(!opt.is_null());
&mut *opt
};
opt.fontdb.load_font_data(data.to_vec())
}
}
/// @brief Loads a font file into the internal fonts database.
///
/// Prints a warning into the log when the data is not a valid TrueType font.
///
/// Has no effect when the `text` feature is not enabled.
///
/// @return #resvg_error with RESVG_OK, RESVG_ERROR_NOT_AN_UTF8_STR or RESVG_ERROR_FILE_OPEN_FAILED
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_load_font_file(
opt: *mut resvg_options,
file_path: *const c_char,
) -> i32 {
#[cfg(feature = "text")]
{
let file_path = match cstr_to_str(file_path) {
Some(v) => v,
None => return resvg_error::NOT_AN_UTF8_STR as i32,
};
let opt = unsafe {
assert!(!opt.is_null());
&mut *opt
};
if opt.fontdb.load_font_file(file_path).is_ok() {
resvg_error::OK as i32
} else {
resvg_error::FILE_OPEN_FAILED as i32
}
}
#[cfg(not(feature = "text"))]
{
resvg_error::OK as i32
}
}
/// @brief Loads system fonts into the internal fonts database.
///
/// This method is very IO intensive.
///
/// This method should be executed only once per #resvg_options.
///
/// The system scanning is not perfect, so some fonts may be omitted.
/// Please send a bug report in this case.
///
/// Prints warnings into the log.
///
/// Has no effect when the `text` feature is not enabled.
#[no_mangle]
#[allow(unused_variables)]
pub extern "C" fn resvg_options_load_system_fonts(opt: *mut resvg_options) {
#[cfg(feature = "text")]
{
let opt = unsafe {
assert!(!opt.is_null());
&mut *opt
};
opt.fontdb.load_system_fonts();
}
}
/// @brief Destroys the #resvg_options.
#[no_mangle]
pub extern "C" fn resvg_options_destroy(opt: *mut resvg_options) {
unsafe {
assert!(!opt.is_null());
let _ = Box::from_raw(opt);
};
}
// TODO: use resvg::Tree
/// @brief An opaque pointer to the rendering tree.
pub struct resvg_render_tree(pub usvg::Tree);
/// @brief Creates #resvg_render_tree from file.
///
/// .svg and .svgz files are supported.
///
/// See #resvg_is_image_empty for details.
///
/// @param file_path UTF-8 file path.
/// @param opt Rendering options. Must not be NULL.
/// @param tree Parsed render tree. Should be destroyed via #resvg_tree_destroy.
/// @return #resvg_error
#[no_mangle]
pub extern "C" fn resvg_parse_tree_from_file(
file_path: *const c_char,
opt: *const resvg_options,
tree: *mut *mut resvg_render_tree,
) -> i32 {
let file_path = match cstr_to_str(file_path) {
Some(v) => v,
None => return resvg_error::NOT_AN_UTF8_STR as i32,
};
let raw_opt = unsafe {
assert!(!opt.is_null());
&*opt
};
let file_data = match std::fs::read(file_path) {
Ok(tree) => tree,
Err(_) => return resvg_error::FILE_OPEN_FAILED as i32,
};
let utree = usvg::Tree::from_data(
&file_data,
&raw_opt.options,
#[cfg(feature = "text")]
&raw_opt.fontdb,
);
let utree = match utree {
Ok(tree) => tree,
Err(e) => return convert_error(e) as i32,
};
let tree_box = Box::new(resvg_render_tree(utree));
unsafe {
*tree = Box::into_raw(tree_box);
}
resvg_error::OK as i32
}
/// @brief Creates #resvg_render_tree from data.
///
/// See #resvg_is_image_empty for details.
///
/// @param data SVG data. Can contain SVG string or gzip compressed data. Must not be NULL.
/// @param len Data length.
/// @param opt Rendering options. Must not be NULL.
/// @param tree Parsed render tree. Should be destroyed via #resvg_tree_destroy.
/// @return #resvg_error
#[no_mangle]
pub extern "C" fn resvg_parse_tree_from_data(
data: *const c_char,
len: usize,
opt: *const resvg_options,
tree: *mut *mut resvg_render_tree,
) -> i32 {
let data = unsafe { slice::from_raw_parts(data as *const u8, len) };
let raw_opt = unsafe {
assert!(!opt.is_null());
&*opt
};
let utree = usvg::Tree::from_data(
data,
&raw_opt.options,
#[cfg(feature = "text")]
&raw_opt.fontdb,
);
let utree = match utree {
Ok(tree) => tree,
Err(e) => return convert_error(e) as i32,
};
let tree_box = Box::new(resvg_render_tree(utree));
unsafe {
*tree = Box::into_raw(tree_box);
}
resvg_error::OK as i32
}
/// @brief Checks that tree has any nodes.
///
/// @param tree Render tree.
/// @return Returns `true` if tree has no nodes.
#[no_mangle]
pub extern "C" fn resvg_is_image_empty(tree: *const resvg_render_tree) -> bool {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
!tree.0.root().has_children()
}
/// @brief Returns an image size.
///
/// The size of a canvas that required to render this SVG.
///
/// The `width` and `height` attributes in SVG.
///
/// @param tree Render tree.
/// @return Image size.
#[no_mangle]
pub extern "C" fn resvg_get_image_size(tree: *const resvg_render_tree) -> resvg_size {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
let size = tree.0.size();
resvg_size {
width: size.width(),
height: size.height(),
}
}
/// @brief Returns an image viewbox.
///
/// The `viewBox` attribute in SVG.
///
/// @param tree Render tree.
/// @return Image viewbox.
#[no_mangle]
pub extern "C" fn resvg_get_image_viewbox(tree: *const resvg_render_tree) -> resvg_rect {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
let r = tree.0.view_box().rect;
resvg_rect {
x: r.x(),
y: r.y(),
width: r.width(),
height: r.height(),
}
}
/// @brief Returns an image bounding box.
///
/// Can be smaller or bigger than a `viewbox`.
///
/// @param tree Render tree.
/// @param bbox Image's bounding box.
/// @return `false` if an image has no elements.
#[no_mangle]
pub extern "C" fn resvg_get_image_bbox(
tree: *const resvg_render_tree,
bbox: *mut resvg_rect,
) -> bool {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
if let Some(r) = tree.0.root().abs_bounding_box().to_non_zero_rect() {
unsafe {
*bbox = resvg_rect {
x: r.x(),
y: r.y(),
width: r.width(),
height: r.height(),
}
}
true
} else {
false
}
}
/// @brief Returns `true` if a renderable node with such an ID exists.
///
/// @param tree Render tree.
/// @param id Node's ID. UTF-8 string. Must not be NULL.
/// @return `true` if a node exists.
/// @return `false` if a node doesn't exist or ID isn't a UTF-8 string.
/// @return `false` if a node exists, but not renderable.
#[no_mangle]
pub extern "C" fn resvg_node_exists(tree: *const resvg_render_tree, id: *const c_char) -> bool {
let id = match cstr_to_str(id) {
Some(v) => v,
None => {
log::warn!("Provided ID is no an UTF-8 string.");
return false;
}
};
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
tree.0.node_by_id(id).is_some()
}
/// @brief Returns node's transform by ID.
///
/// @param tree Render tree.
/// @param id Node's ID. UTF-8 string. Must not be NULL.
/// @param transform Node's transform.
/// @return `true` if a node exists.
/// @return `false` if a node doesn't exist or ID isn't a UTF-8 string.
/// @return `false` if a node exists, but not renderable.
#[no_mangle]
pub extern "C" fn resvg_get_node_transform(
tree: *const resvg_render_tree,
id: *const c_char,
transform: *mut resvg_transform,
) -> bool {
let id = match cstr_to_str(id) {
Some(v) => v,
None => {
log::warn!("Provided ID is no an UTF-8 string.");
return false;
}
};
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
if let Some(node) = tree.0.node_by_id(id) {
let abs_ts = node.abs_transform();
unsafe {
*transform = resvg_transform {
a: abs_ts.sx,
b: abs_ts.ky,
c: abs_ts.kx,
d: abs_ts.sy,
e: abs_ts.tx,
f: abs_ts.ty,
}
}
return true;
}
false
}
/// @brief Returns node's bounding box in canvas coordinates by ID.
///
/// @param tree Render tree.
/// @param id Node's ID. Must not be NULL.
/// @param bbox Node's bounding box.
/// @return `false` if a node with such an ID does not exist
/// @return `false` if ID isn't a UTF-8 string.
/// @return `false` if ID is an empty string
#[no_mangle]
pub extern "C" fn resvg_get_node_bbox(
tree: *const resvg_render_tree,
id: *const c_char,
bbox: *mut resvg_rect,
) -> bool {
get_node_bbox(tree, id, bbox, &|node| node.abs_bounding_box())
}
/// @brief Returns node's bounding box, including stroke, in canvas coordinates by ID.
///
/// @param tree Render tree.
/// @param id Node's ID. Must not be NULL.
/// @param bbox Node's bounding box.
/// @return `false` if a node with such an ID does not exist
/// @return `false` if ID isn't a UTF-8 string.
/// @return `false` if ID is an empty string
#[no_mangle]
pub extern "C" fn resvg_get_node_stroke_bbox(
tree: *const resvg_render_tree,
id: *const c_char,
bbox: *mut resvg_rect,
) -> bool {
get_node_bbox(tree, id, bbox, &|node| node.abs_stroke_bounding_box())
}
fn get_node_bbox(
tree: *const resvg_render_tree,
id: *const c_char,
bbox: *mut resvg_rect,
f: &dyn Fn(&usvg::Node) -> usvg::Rect,
) -> bool {
let id = match cstr_to_str(id) {
Some(v) => v,
None => {
log::warn!("Provided ID is no an UTF-8 string.");
return false;
}
};
if id.is_empty() {
log::warn!("Node ID must not be empty.");
return false;
}
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
match tree.0.node_by_id(id) {
Some(node) => {
let r = f(node);
unsafe {
*bbox = resvg_rect {
x: r.x(),
y: r.y(),
width: r.width(),
height: r.height(),
}
}
true
}
None => {
log::warn!("No node with '{}' ID is in the tree.", id);
false
}
}
}
/// @brief Destroys the #resvg_render_tree.
#[no_mangle]
pub extern "C" fn resvg_tree_destroy(tree: *mut resvg_render_tree) {
unsafe {
assert!(!tree.is_null());
let _ = Box::from_raw(tree);
};
}
fn cstr_to_str(text: *const c_char) -> Option<&'static str> {
let text = unsafe {
assert!(!text.is_null());
CStr::from_ptr(text)
};
text.to_str().ok()
}
fn convert_error(e: usvg::Error) -> resvg_error {
match e {
usvg::Error::NotAnUtf8Str => resvg_error::NOT_AN_UTF8_STR,
usvg::Error::MalformedGZip => resvg_error::MALFORMED_GZIP,
usvg::Error::ElementsLimitReached => resvg_error::ELEMENTS_LIMIT_REACHED,
usvg::Error::InvalidSize => resvg_error::INVALID_SIZE,
usvg::Error::ParsingFailed(_) => resvg_error::PARSING_FAILED,
}
}
/// @brief Renders the #resvg_render_tree onto the pixmap.
///
/// @param tree A render tree.
/// @param transform A root SVG transform. Can be used to position SVG inside the `pixmap`.
/// @param width Pixmap width.
/// @param height Pixmap height.
/// @param pixmap Pixmap data. Should have width*height*4 size and contain
/// premultiplied RGBA8888 pixels.
#[no_mangle]
pub extern "C" fn resvg_render(
tree: *const resvg_render_tree,
transform: resvg_transform,
width: u32,
height: u32,
pixmap: *mut c_char,
) {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
let pixmap_len = width as usize * height as usize * tiny_skia::BYTES_PER_PIXEL;
let pixmap: &mut [u8] =
unsafe { std::slice::from_raw_parts_mut(pixmap as *mut u8, pixmap_len) };
let mut pixmap = tiny_skia::PixmapMut::from_bytes(pixmap, width, height).unwrap();
resvg::render(&tree.0, transform.to_tiny_skia(), &mut pixmap)
}
/// @brief Renders a Node by ID onto the image.
///
/// @param tree A render tree.
/// @param id Node's ID. Must not be NULL.
/// @param transform A root SVG transform. Can be used to position SVG inside the `pixmap`.
/// @param width Pixmap width.
/// @param height Pixmap height.
/// @param pixmap Pixmap data. Should have width*height*4 size and contain
/// premultiplied RGBA8888 pixels.
/// @return `false` when `id` is not a non-empty UTF-8 string.
/// @return `false` when the selected `id` is not present.
/// @return `false` when an element has a zero bbox.
#[no_mangle]
pub extern "C" fn resvg_render_node(
tree: *const resvg_render_tree,
id: *const c_char,
transform: resvg_transform,
width: u32,
height: u32,
pixmap: *mut c_char,
) -> bool {
let tree = unsafe {
assert!(!tree.is_null());
&*tree
};
let id = match cstr_to_str(id) {
Some(v) => v,
None => return false,
};
if id.is_empty() {
log::warn!("Node with an empty ID cannot be rendered.");
return false;
}
if let Some(node) = tree.0.node_by_id(id) {
let pixmap_len = width as usize * height as usize * tiny_skia::BYTES_PER_PIXEL;
let pixmap: &mut [u8] =
unsafe { std::slice::from_raw_parts_mut(pixmap as *mut u8, pixmap_len) };
let mut pixmap = tiny_skia::PixmapMut::from_bytes(pixmap, width, height).unwrap();
resvg::render_node(node, transform.to_tiny_skia(), &mut pixmap).is_some()
} else {
log::warn!("A node with '{}' ID wasn't found.", id);
false
}
}
/// A simple stderr logger.
static LOGGER: SimpleLogger = SimpleLogger;
struct SimpleLogger;
impl log::Log for SimpleLogger {
fn enabled(&self, metadata: &log::Metadata) -> bool {
metadata.level() <= log::LevelFilter::Warn
}
fn log(&self, record: &log::Record) {
if self.enabled(record.metadata()) {
let target = if record.target().len() > 0 {
record.target()
} else {
record.module_path().unwrap_or_default()
};
let line = record.line().unwrap_or(0);
let args = record.args();
match record.level() {
log::Level::Error => eprintln!("Error (in {}:{}): {}", target, line, args),
log::Level::Warn => eprintln!("Warning (in {}:{}): {}", target, line, args),
log::Level::Info => eprintln!("Info (in {}:{}): {}", target, line, args),
log::Level::Debug => eprintln!("Debug (in {}:{}): {}", target, line, args),
log::Level::Trace => eprintln!("Trace (in {}:{}): {}", target, line, args),
}
}
}
fn flush(&self) {}
}