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//! # Drawing UTF-8 strings with freetype/harfbuzz
//!
//! This modules is to draw UTF-8 strings with freetype/harfbuzz.
//!
//! 1. Install freetype2 and harfbuzz in your system.
//! 2. Create FreeType2 instance with createFreeType2() function.
//! 3. Load font file with loadFontData() function.
//! 4. Draw text with putText() function.
//!
//! - If thickness parameter is negative, drawing glyph is filled.
//! - If thickness parameter is positive, drawing glyph is outlined with thickness.
//! - If line_type parameter is 16(or CV_AA), drawing glyph is smooth.
use std::os::raw::{c_char, c_void};
use libc::size_t;
use crate::{Error, Result, core, sys, types};
/// Create FreeType2 Instance
///
/// The function createFreeType2 create instance to draw UTF-8 strings.
pub fn create_free_type2() -> Result<types::PtrOfFreeType2> {
unsafe { sys::cv_freetype_createFreeType2() }.into_result().map(|x| types::PtrOfFreeType2 { ptr: x })
}
// Generating impl for trait cv::freetype::FreeType2 (trait)
pub trait FreeType2 : core::Algorithm {
#[doc(hidden)] fn as_raw_FreeType2(&self) -> *mut c_void;
/// Load font data.
///
/// The function loadFontData loads font data.
///
/// ## Parameters
/// * fontFileName: FontFile Name
/// * id: face_index to select a font faces in a single file.
fn load_font_data(&mut self, font_file_name: &str, id: i32) -> Result<()> {
string_arg!(mut font_file_name);
unsafe { sys::cv_freetype_FreeType2_loadFontData_String_int(self.as_raw_FreeType2(), font_file_name.as_ptr() as _, id) }.into_result()
}
/// Set Split Number from Bezier-curve to line
///
/// The function setSplitNumber set the number of split points from bezier-curve to line.
/// If you want to draw large glyph, large is better.
/// If you want to draw small glyph, small is better.
///
/// ## Parameters
/// * num: number of split points from bezier-curve to line
fn set_split_number(&mut self, num: i32) -> Result<()> {
unsafe { sys::cv_freetype_FreeType2_setSplitNumber_int(self.as_raw_FreeType2(), num) }.into_result()
}
/// Draws a text string.
///
/// The function putText renders the specified text string in the image. Symbols that cannot be rendered using the specified font are replaced by "Tofu" or non-drawn.
///
/// ## Parameters
/// * img: Image.
/// * text: Text string to be drawn.
/// * org: Bottom-left/Top-left corner of the text string in the image.
/// * fontHeight: Drawing font size by pixel unit.
/// * color: Text color.
/// * thickness: Thickness of the lines used to draw a text when negative, the glyph is filled. Otherwise, the glyph is drawn with this thickness.
/// * line_type: Line type. See the line for details.
/// * bottomLeftOrigin: When true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner.
fn put_text(&mut self, img: &mut core::Mat, text: &str, org: core::Point, font_height: i32, color: core::Scalar, thickness: i32, line_type: i32, bottom_left_origin: bool) -> Result<()> {
string_arg!(text);
unsafe { sys::cv_freetype_FreeType2_putText_Mat_String_Point_int_Scalar_int_int_bool(self.as_raw_FreeType2(), img.as_raw_Mat(), text.as_ptr(), org, font_height, color, thickness, line_type, bottom_left_origin) }.into_result()
}
/// Calculates the width and height of a text string.
///
/// The function getTextSize calculates and returns the approximate size of a box that contains the specified text.
/// That is, the following code renders some text, the tight box surrounding it, and the baseline: :
/// ```ignore
/// String text = "Funny text inside the box";
/// int fontHeight = 60;
/// int thickness = -1;
/// int linestyle = 8;
///
/// Mat img(600, 800, CV_8UC3, Scalar::all(0));
///
/// int baseline=0;
///
/// cv::Ptr<cv::freetype::FreeType2> ft2;
/// ft2 = cv::freetype::createFreeType2();
/// ft2->loadFontData( "./mplus-1p-regular.ttf", 0 );
///
/// Size textSize = ft2->getTextSize(text,
/// fontHeight,
/// thickness,
/// &baseline);
///
/// if(thickness > 0){
/// baseline += thickness;
/// }
///
/// // center the text
/// Point textOrg((img.cols - textSize.width) / 2,
/// (img.rows + textSize.height) / 2);
///
/// // draw the box
/// rectangle(img, textOrg + Point(0, baseline),
/// textOrg + Point(textSize.width, -textSize.height),
/// Scalar(0,255,0),1,8);
///
/// // ... and the baseline first
/// line(img, textOrg + Point(0, thickness),
/// textOrg + Point(textSize.width, thickness),
/// Scalar(0, 0, 255),1,8);
///
/// // then put the text itself
/// ft2->putText(img, text, textOrg, fontHeight,
/// Scalar::all(255), thickness, linestyle, true );
/// ```
///
///
/// ## Parameters
/// * text: Input text string.
/// * fontHeight: Drawing font size by pixel unit.
/// * thickness: Thickness of lines used to render the text. See putText for details.
/// * baseLine: [out] y-coordinate of the baseline relative to the bottom-most text
/// point.
/// ## Returns
/// The size of a box that contains the specified text.
///
/// @see cv::putText
fn get_text_size(&mut self, text: &str, font_height: i32, thickness: i32, base_line: &mut i32) -> Result<core::Size> {
string_arg!(text);
unsafe { sys::cv_freetype_FreeType2_getTextSize_String_int_int_int_X(self.as_raw_FreeType2(), text.as_ptr(), font_height, thickness, base_line) }.into_result()
}
}
impl<'a> FreeType2 + 'a {
}