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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).
//
#include <GraphMol/MolDraw2D/DrawTextCairo.h>
#include <GraphMol/MolDraw2D/MolDraw2D.h>
using namespace std;
namespace RDKit {
namespace MolDraw2D_detail {
// ****************************************************************************
DrawTextCairo::DrawTextCairo(double max_fnt_sz, double min_fnt_sz,
cairo_t *dp_cr)
: DrawTextNotFT(max_fnt_sz, min_fnt_sz), dp_cr_(dp_cr) {
setCairoContext(dp_cr);
}
// ****************************************************************************
// draw the char, with the bottom left hand corner at cds
void DrawTextCairo::drawChar(char c, const Point2D &cds) {
PRECONDITION(dp_cr_, "no draw context");
cairo_set_font_size(dp_cr_, fontSize());
DrawColour col = colour();
cairo_set_source_rgba(dp_cr_, col.r, col.g, col.b, col.a);
char txt[2];
txt[0] = c;
txt[1] = 0;
cairo_move_to(dp_cr_, cds.x, cds.y);
cairo_show_text(dp_cr_, txt);
cairo_stroke(dp_cr_);
}
void DrawTextCairo::setCairoContext(cairo_t *cr) {
dp_cr_ = cr;
if (dp_cr_) {
cairo_select_font_face(dp_cr_, "sans", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(dp_cr_, fontSize());
}
}
// ****************************************************************************
void DrawTextCairo::getStringRects(const string &text,
vector<shared_ptr<StringRect>> &rects,
vector<TextDrawType> &draw_modes,
vector<char> &draw_chars) const {
TextDrawType draw_mode = TextDrawType::TextDrawNormal;
double running_x = 0.0;
char char_str[2];
char_str[1] = 0;
double max_y = 0.0;
double full_fs = fontSize();
auto *p_cr = dp_cr_;
if (p_cr == nullptr) {
// allocate an arbitrarily sized context temporarily
cairo_surface_t *surf =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 200, 200);
p_cr = cairo_create(surf);
cairo_surface_destroy(surf); // dp_cr has a reference to this now;
cairo_select_font_face(p_cr, "sans", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
}
for (size_t i = 0; i < text.length(); ++i) {
// setStringDrawMode moves i along to the end of any <sub> or <sup>
// markup
if ('<' == text[i] && setStringDrawMode(text, draw_mode, i)) {
continue;
}
draw_chars.push_back(text[i]);
char_str[0] = text[i];
cairo_text_extents_t extents;
cairo_set_font_size(p_cr, selectScaleFactor(text[i], draw_mode) * full_fs);
cairo_text_extents(p_cr, char_str, &extents);
cairo_set_font_size(p_cr, full_fs);
double twidth = extents.width;
double theight = extents.height;
Point2D offset(extents.x_bearing + twidth / 2.0, -extents.y_bearing / 2.0);
Point2D g_centre(offset.x, -extents.y_bearing - theight / 2.0);
rects.push_back(shared_ptr<StringRect>(
new StringRect(offset, g_centre, twidth, theight)));
rects.back()->trans_.x = running_x;
draw_modes.push_back(draw_mode);
running_x += extents.x_advance;
max_y = max(max_y, -extents.y_bearing);
}
for (auto r : rects) {
r->g_centre_.y = max_y - r->g_centre_.y;
r->offset_.y = max_y / 2.0;
}
if (dp_cr_ == nullptr) {
if (cairo_get_reference_count(p_cr) > 0) {
cairo_destroy(p_cr);
}
}
adjustStringRectsForSuperSubScript(draw_modes, rects);
}
} // namespace MolDraw2D_detail
} // namespace RDKit
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