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//
// Copyright (C) 2020-2022 David Cosgrove and other RDKit contributors
//
// @@ All Rights Reserved @@
// This file is part of the RDKit.
// The contents are covered by the terms of the BSD license
// which is included in the file license.txt, found at the root
// of the RDKit source tree.
//
//
// Original author: David Cosgrove (CozChemIx).
//
// This is an abstract base class derived from DrawText that does drawing
// using FreeType.
#ifndef RDKIT_DRAWTEXTFT_H
#define RDKIT_DRAWTEXTFT_H
#include <string>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_BBOX_H
#include FT_OUTLINE_H
#include <RDGeneral/export.h>
#include <GraphMol/MolDraw2D/DrawText.h>
namespace RDKit {
struct StringRect;
namespace MolDraw2D_detail {
// ****************************************************************************
class RDKIT_MOLDRAW2D_EXPORT DrawTextFT : public DrawText {
public:
virtual ~DrawTextFT() override;
virtual int MoveToFunctionImpl(const FT_Vector *to) = 0;
virtual int LineToFunctionImpl(const FT_Vector *to) = 0;
virtual int ConicToFunctionImpl(const FT_Vector *control,
const FT_Vector *to) = 0;
virtual int CubicToFunctionImpl(const FT_Vector *controlOne,
const FT_Vector *controlTwo,
const FT_Vector *to) = 0;
DrawTextFT(double max_fnt_sz, double min_fnt_sz,
const std::string &font_file);
DrawTextFT(const DrawTextFT &) = delete;
DrawTextFT(DrawTextFT &&) = delete;
DrawTextFT &operator=(const DrawTextFT &) = delete;
DrawTextFT &operator=(DrawTextFT &&) = delete;
void drawChar(char c, const Point2D &cds) override;
// unless over-ridden by the c'tor, this will return a hard-coded
// file from $RDBASE.
std::string getFontFile() const override;
void setFontFile(const std::string &font_file) override;
double fontCoordToDrawCoord(FT_Pos fc) const;
void fontPosToDrawPos(FT_Pos fx, FT_Pos fy, double &dx, double &dy) const;
// adds x_trans_ and y_trans_ to coords returns x advance distance
virtual double extractOutline();
FT_Library library_;
FT_Face face_;
std::string font_file_; // over-rides default if not empty.
double x_trans_, y_trans_;
mutable FT_Pos
string_y_max_; // maximum y value of string drawn, for inverting y
double em_scale_;
// return a vector of StringRects, one for each char in text, with
// super- and subscripts taken into account. Sizes in pixel coords,
// i.e. scaled by fontScale().
void getStringRects(const std::string &text,
std::vector<std::shared_ptr<StringRect>> &rects,
std::vector<TextDrawType> &draw_modes,
std::vector<char> &draw_chars) const override;
// calculate the bounding box of the glyph for c in
// font units (0 -> face_->units_per_EM (2048 for roboto font).
void calcGlyphBBox(char c, FT_Pos &x_min, FT_Pos &y_min, FT_Pos &x_max,
FT_Pos &y_max, FT_Pos &advance) const;
};
// Callbacks for FT_Outline_Decompose. user should be a pointer to
// an instance of DrawTextFT.
int moveToFunction(const FT_Vector *to, void *user);
int lineToFunction(const FT_Vector *to, void *user);
int conicToFunction(const FT_Vector *control, const FT_Vector *to, void *user);
int cubicToFunction(const FT_Vector *controlOne, const FT_Vector *controlTwo,
const FT_Vector *to, void *user);
} // namespace MolDraw2D_detail
} // namespace RDKit
#endif // RDKIT_DRAWTEXTFT_H
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