pdfium-render 0.9.0

//! Defines the [PdfFontGlyph] struct, exposing functionality related to a single
//! font glyph in a `PdfFontGlyphs` collection.

use crate::bindgen::{FPDF_FONT, FPDF_GLYPHPATH};
use crate::error::{PdfiumError, PdfiumInternalError};
use crate::pdf::font::glyphs::PdfFontGlyphIndex;
use crate::pdf::path::segment::PdfPathSegment;
use crate::pdf::path::segments::{PdfPathSegmentIndex, PdfPathSegments, PdfPathSegmentsIterator};
use crate::pdf::points::PdfPoints;
use crate::pdfium::PdfiumLibraryBindingsAccessor;
use std::convert::TryInto;
use std::marker::PhantomData;
use std::os::raw::{c_float, c_int, c_uint};

/// A single font glyph in a `PdfFontGlyphs` collection.
pub struct PdfFontGlyph<'a> {
    handle: FPDF_FONT,
    index: PdfFontGlyphIndex,
    lifetime: PhantomData<&'a FPDF_FONT>,
}

impl<'a> PdfFontGlyph<'a> {
    #[inline]
    pub(crate) fn from_pdfium(handle: FPDF_FONT, index: PdfFontGlyphIndex) -> Self {
        Self {
            handle,
            index,
            lifetime: PhantomData,
        }
    }

    /// Returns the width of this [PdfFontGlyph] when rendered at the given font size.
    pub fn width_at_font_size(&self, size: PdfPoints) -> PdfPoints {
        let mut width = 0.0;

        if self.bindings().is_true(unsafe {
            self.bindings().FPDFFont_GetGlyphWidth(
                self.handle,
                self.index as c_uint,
                size.value as c_float,
                &mut width,
            )
        }) {
            PdfPoints::new(width)
        } else {
            PdfPoints::ZERO
        }
    }

    /// Returns the path segments of this [PdfFontGlyph] when rendered at the given font size.
    pub fn segments_at_font_size(
        &self,
        size: PdfPoints,
    ) -> Result<PdfFontGlyphPath<'_>, PdfiumError> {
        let handle = unsafe {
            self.bindings().FPDFFont_GetGlyphPath(
                self.handle,
                self.index as c_uint,
                size.value as c_float,
            )
        };

        if handle.is_null() {
            Err(PdfiumError::PdfiumLibraryInternalError(
                PdfiumInternalError::Unknown,
            ))
        } else {
            Ok(PdfFontGlyphPath::from_pdfium(handle))
        }
    }
}

impl<'a> PdfiumLibraryBindingsAccessor<'a> for PdfFontGlyph<'a> {}

#[cfg(feature = "thread_safe")]
unsafe impl<'a> Send for PdfFontGlyph<'a> {}

#[cfg(feature = "thread_safe")]
unsafe impl<'a> Sync for PdfFontGlyph<'a> {}
/// The collection of [PdfPathSegment] objects inside a font glyph path.
pub struct PdfFontGlyphPath<'a> {
    handle: FPDF_GLYPHPATH,
    lifetime: PhantomData<&'a FPDF_GLYPHPATH>,
}

impl<'a> PdfFontGlyphPath<'a> {
    #[inline]
    pub(crate) fn from_pdfium(handle: FPDF_GLYPHPATH) -> Self {
        Self {
            handle,
            lifetime: PhantomData,
        }
    }
}

impl<'a> PdfPathSegments<'a> for PdfFontGlyphPath<'a> {
    #[inline]
    fn len(&self) -> PdfPathSegmentIndex {
        (unsafe {
            self.bindings()
                .FPDFGlyphPath_CountGlyphSegments(self.handle)
        })
        .try_into()
        .unwrap_or(0)
    }

    fn get(&self, index: PdfPathSegmentIndex) -> Result<PdfPathSegment<'a>, PdfiumError> {
        let handle = unsafe {
            self.bindings()
                .FPDFGlyphPath_GetGlyphPathSegment(self.handle, index as c_int)
        };

        if handle.is_null() {
            Err(PdfiumError::PdfiumLibraryInternalError(
                PdfiumInternalError::Unknown,
            ))
        } else {
            Ok(PdfPathSegment::from_pdfium(handle, None))
        }
    }

    #[inline]
    fn iter(&'a self) -> PdfPathSegmentsIterator<'a> {
        PdfPathSegmentsIterator::new(self)
    }
}

impl<'a> PdfiumLibraryBindingsAccessor<'a> for PdfFontGlyphPath<'a> {}

#[cfg(feature = "thread_safe")]
unsafe impl<'a> Send for PdfFontGlyphPath<'a> {}

#[cfg(feature = "thread_safe")]
unsafe impl<'a> Sync for PdfFontGlyphPath<'a> {}