346 lines
11 KiB
C++
346 lines
11 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#ifndef __GLYPH_LAYOUT_H_INCLUDED__
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#define __GLYPH_LAYOUT_H_INCLUDED__
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#include "irrTypes.h"
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#include "dimension2d.h"
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#include <algorithm>
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#include <numeric>
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#include <vector>
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namespace irr
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{
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namespace gui
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{
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enum GlyphLayoutFlag
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{
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GLF_RTL_LINE = 1, /* This line from this glyph is RTL. */
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GLF_RTL_CHAR = 2, /* This character(s) from this glyph is RTL. */
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GLF_BREAKABLE = 4, /* This glyph is breakable when line breaking. */
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GLF_QUICK_DRAW = 8, /* This glyph is not created by libraqm, which get x_advance_x directly from font. */
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GLF_NEWLINE = 16, /* This glyph will start a newline. */
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GLF_COLORED = 32 /* This glyph is a colored one (for example emoji). */
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};
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enum GlyphLayoutDraw
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{
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GLD_NONE = 0, /* Default flag. */
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GLD_MARKED = 1, /* This glyph will be drawn with background marked for marked text. */
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GLD_COMPOSING = 2 /* This glyph will be drawn with underline (for example composing text). */
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};
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//! GlyphLayout copied from libraqm.
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struct GlyphLayout
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{
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u32 index;
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s32 x_advance;
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//s32 y_advance; we don't use y_advance atm
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s32 x_offset;
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s32 y_offset;
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/* Above variable is same for raqm_glyph_t */
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// If some characters share the same glyph
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std::vector<s32> cluster;
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std::vector<u8> draw_flags;
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//! used to sorting back the visual order after line breaking
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u32 original_index;
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u16 flags;
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//! this is the face_idx used in stk face ttf
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u16 face_idx;
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};
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namespace Private
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{
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inline void breakLine(std::vector<GlyphLayout> gls, f32 max_line_width,
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f32 inverse_shaping, f32 scale, std::vector<std::vector<GlyphLayout> >& result);
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}
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inline void eraseTopLargerThan(std::vector<GlyphLayout>& gls,
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f32 height_per_line, f32 max_height)
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{
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if (max_height < height_per_line * 2.0f)
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return;
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std::vector<u32> newline_positions;
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for (unsigned i = 0; i < gls.size(); i++)
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{
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const GlyphLayout& glyph = gls[i];
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if ((glyph.flags & GLF_NEWLINE) != 0)
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{
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newline_positions.push_back(i);
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continue;
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}
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}
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// Handle the first line
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f32 total_height = height_per_line +
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(f32)newline_positions.size() * height_per_line;
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if (total_height > max_height)
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{
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u32 idx = (u32)((total_height - max_height) / height_per_line);
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if (idx < newline_positions.size())
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{
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auto end_it = gls.begin() + newline_positions[idx] + 1;
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if (end_it != gls.end())
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gls.erase(gls.begin(), end_it);
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}
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}
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}
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inline core::dimension2d<u32> getGlyphLayoutsDimension(
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const std::vector<GlyphLayout>& gls, s32 height_per_line, f32 inverse_shaping,
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f32 scale, s32 cluster = -1)
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{
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core::dimension2d<f32> dim(0.0f, 0.0f);
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core::dimension2d<f32> this_line(0.0f, height_per_line);
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for (unsigned i = 0; i < gls.size(); i++)
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{
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const GlyphLayout& glyph = gls[i];
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if ((glyph.flags & GLF_NEWLINE) != 0)
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{
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dim.Height += this_line.Height;
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if (dim.Width < this_line.Width)
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dim.Width = this_line.Width;
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this_line.Width = 0;
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continue;
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}
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f32 cur_width = (s32)(glyph.x_advance * inverse_shaping) * scale;
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bool found_cluster = false;
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// Cursor positioning
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if (cluster != -1)
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{
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auto it = std::find(glyph.cluster.begin(), glyph.cluster.end(), cluster);
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if (it != glyph.cluster.end() &&
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(i == gls.size() - 1 || cluster != gls[i + 1].cluster.front()))
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{
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found_cluster = true;
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// Get cluster ratio to total glyph width, so for example
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// cluster 0 in ffi glyph will be 0.333
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f32 ratio = f32(it - glyph.cluster.begin() + 1) /
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(f32)glyph.cluster.size();
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// Show cursor in left side, so no need to add width
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if ((glyph.flags & GLF_RTL_CHAR) != 0)
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cur_width = 0;
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else
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cur_width *= ratio;
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}
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}
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this_line.Width += cur_width;
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if (found_cluster)
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break;
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}
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dim.Height += this_line.Height;
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if (dim.Width < this_line.Width)
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dim.Width = this_line.Width;
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core::dimension2d<u32> ret_dim(0, 0);
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ret_dim.Width = (u32)(dim.Width + 0.9f); // round up
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ret_dim.Height = (u32)(dim.Height + 0.9f);
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return ret_dim;
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}
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inline s32 getCurosrFromDimension(f32 x, f32 y,
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const std::vector<GlyphLayout>& gls, s32 height_per_line,
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f32 inverse_shaping, f32 scale)
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{
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if (gls.empty())
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return 0;
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f32 total_width = 0.0f;
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for (unsigned i = 0; i < gls.size(); i++)
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{
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const GlyphLayout& glyph = gls[i];
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if ((glyph.flags & GLF_NEWLINE) != 0)
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{
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// TODO: handling newline
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break;
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}
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f32 cur_width = (s32)(glyph.x_advance * inverse_shaping) * scale;
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if (glyph.cluster.size() == 1)
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{
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if (i == 0 && cur_width * 0.5 > x)
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return 0;
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if (total_width + cur_width * 0.5 > x)
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return glyph.cluster.front();
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}
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else if (total_width + cur_width > x)
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{
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// Handle glyph like 'ffi'
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f32 each_cluster_width = cur_width / (f32)glyph.cluster.size();
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f32 remain_width = x - total_width;
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total_width = 0.0f;
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for (unsigned j = 0; j < glyph.cluster.size(); j++)
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{
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if (total_width + each_cluster_width * 0.5 > remain_width)
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return glyph.cluster[j];
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total_width += each_cluster_width;
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}
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return glyph.cluster.back();
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}
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total_width += cur_width;
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}
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return gls.back().cluster.back() + 1;
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}
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inline std::vector<f32> getGlyphLayoutsWidthPerLine(
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const std::vector<GlyphLayout>& gls, f32 inverse_shaping, f32 scale)
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{
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std::vector<f32> result;
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f32 cur_width = 0.0f;
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for (auto& glyph : gls)
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{
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if ((glyph.flags & GLF_NEWLINE) != 0)
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{
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result.push_back(cur_width);
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cur_width = 0;
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continue;
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}
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cur_width += (s32)(glyph.x_advance * inverse_shaping) * scale;
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}
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result.push_back(cur_width);
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return result;
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}
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inline void breakGlyphLayouts(std::vector<GlyphLayout>& gls, f32 max_line_width,
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f32 inverse_shaping, f32 scale)
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{
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if (gls.size() < 2)
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return;
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std::vector<std::vector<GlyphLayout> > broken_line;
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u32 start = 0;
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for (u32 i = 0; i < gls.size(); i++)
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{
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GlyphLayout& glyph = gls[i];
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if ((glyph.flags & GLF_NEWLINE) != 0)
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{
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Private::breakLine({ gls.begin() + start, gls.begin() + i},
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max_line_width, inverse_shaping, scale, broken_line);
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start = i + 1;
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}
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}
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if (start - gls.size() - 1 > 0)
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{
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Private::breakLine({ gls.begin() + start, gls.begin() + gls.size() },
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max_line_width, inverse_shaping, scale, broken_line);
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}
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gls.clear();
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// Sort glyphs in original order
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for (u32 i = 0; i < broken_line.size(); i++)
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{
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if (i != 0)
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{
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gui::GlyphLayout gl = { 0 };
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gl.flags = gui::GLF_NEWLINE;
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gls.push_back(gl);
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}
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auto& line = broken_line[i];
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std::sort(line.begin(), line.end(), []
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(const irr::gui::GlyphLayout& a_gi,
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const irr::gui::GlyphLayout& b_gi)
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{
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return a_gi.original_index < b_gi.original_index;
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});
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for (auto& glyph : line)
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gls.push_back(glyph);
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}
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}
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namespace Private
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{
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/** Used it only for single line (ie without line breaking mark). */
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inline f32 getGlyphLayoutsWidth(const std::vector<GlyphLayout>& gls,
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f32 inverse_shaping, f32 scale)
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{
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return std::accumulate(gls.begin(), gls.end(), 0,
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[inverse_shaping, scale] (const f32 previous,
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const irr::gui::GlyphLayout& cur_gi)
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{
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return previous + (s32)(cur_gi.x_advance * inverse_shaping) * scale;
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});
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}
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inline void breakLine(std::vector<GlyphLayout> gls, f32 max_line_width,
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f32 inverse_shaping, f32 scale,
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std::vector<std::vector<GlyphLayout> >& result)
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{
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const f32 line_size = getGlyphLayoutsWidth(gls, inverse_shaping, scale);
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if (line_size <= max_line_width)
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{
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result.emplace_back(std::move(gls));
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return;
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}
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// Sort glyphs in logical order
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std::sort(gls.begin(), gls.end(), []
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(const GlyphLayout& a_gi, const GlyphLayout& b_gi)
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{
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return a_gi.cluster.front() < b_gi.cluster.front();
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});
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u32 end = 0;
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s32 start = 0;
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f32 total_width = 0.0f;
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for (; end < gls.size(); end++)
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{
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f32 cur_width = (s32)(gls[end].x_advance * inverse_shaping) * scale;
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if (cur_width > max_line_width)
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{
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// Very large glyph
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result.push_back({gls[end]});
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start = end;
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}
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else if (cur_width + total_width <= max_line_width)
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{
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total_width += cur_width;
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}
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else
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{
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int break_point = end - 1;
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do
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{
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if (break_point <= 0 || break_point == start)
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{
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// Forcely break at line ending position if no break
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// mark, this fix text without space of out network
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// lobby
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result.push_back(
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{gls.begin() + start, gls.begin() + end});
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start = end;
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total_width = (s32)(gls[end].x_advance * inverse_shaping) * scale;
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break;
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}
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if ((gls[break_point].flags & GLF_BREAKABLE) != 0)
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{
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result.push_back(
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{gls.begin() + start, gls.begin() + break_point + 1});
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end = start = break_point + 1;
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total_width = (s32)(gls[end].x_advance * inverse_shaping) * scale;
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break;
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}
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break_point--;
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}
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while (break_point >= start);
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}
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}
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if (gls.begin() + start != gls.end())
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{
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result.push_back({gls.begin() + start, gls.end()});
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}
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}
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}
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} // end namespace gui
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} // end namespace irr
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#endif
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