Mercurial > octave
view libinterp/corefcn/ft-text-renderer.cc @ 25438:cb1606f78f6b
prefer <istream>, <ostream>, or <iosfwd> to <iostream> where possible
Using <iostream> brings with it a static initializer for the std::cin,
std::cout, and std::cerr streams. In most cases they are not needed
and should be avoided if possible.
Files affected:
build-aux/mk-opts.pl
libgui/qterminal/libqterminal/win32/QWinTerminalImpl.cpp
libinterp/corefcn/__dsearchn__.cc
libinterp/corefcn/c-file-ptr-stream.cc
libinterp/corefcn/c-file-ptr-stream.h
libinterp/corefcn/daspk.cc
libinterp/corefcn/dasrt.cc
libinterp/corefcn/dassl.cc
libinterp/corefcn/defaults.cc
libinterp/corefcn/defun.cc
libinterp/corefcn/file-io.cc
libinterp/corefcn/ft-text-renderer.cc
libinterp/corefcn/gl-render.cc
libinterp/corefcn/help.cc
libinterp/corefcn/ls-ascii-helper.cc
libinterp/corefcn/ls-hdf5.cc
libinterp/corefcn/ls-hdf5.h
libinterp/corefcn/ls-mat-ascii.cc
libinterp/corefcn/ls-mat4.cc
libinterp/corefcn/ls-mat5.cc
libinterp/corefcn/ls-oct-binary.cc
libinterp/corefcn/ls-oct-text.cc
libinterp/corefcn/lsode.cc
libinterp/corefcn/oct-iostrm.cc
libinterp/corefcn/oct-procbuf.cc
libinterp/corefcn/oct-stdstrm.h
libinterp/corefcn/procstream.cc
libinterp/corefcn/procstream.h
libinterp/corefcn/quad.cc
libinterp/corefcn/symscope.h
libinterp/corefcn/symtab.h
libinterp/corefcn/toplev.cc
libinterp/corefcn/urlwrite.cc
libinterp/corefcn/utils.cc
libinterp/corefcn/zfstream.cc
libinterp/dldfcn/__ode15__.cc
libinterp/dldfcn/convhulln.cc
libinterp/octave-value/ov-base-diag.cc
libinterp/octave-value/ov-base-int.cc
libinterp/octave-value/ov-base-mat.cc
libinterp/octave-value/ov-base-scalar.cc
libinterp/octave-value/ov-base-sparse.cc
libinterp/octave-value/ov-base.cc
libinterp/octave-value/ov-bool-mat.cc
libinterp/octave-value/ov-bool-sparse.cc
libinterp/octave-value/ov-bool.cc
libinterp/octave-value/ov-cell.cc
libinterp/octave-value/ov-ch-mat.cc
libinterp/octave-value/ov-class.cc
libinterp/octave-value/ov-colon.cc
libinterp/octave-value/ov-complex.cc
libinterp/octave-value/ov-cs-list.cc
libinterp/octave-value/ov-cx-mat.cc
libinterp/octave-value/ov-cx-sparse.cc
libinterp/octave-value/ov-fcn-handle.cc
libinterp/octave-value/ov-fcn-inline.cc
libinterp/octave-value/ov-float.cc
libinterp/octave-value/ov-flt-complex.cc
libinterp/octave-value/ov-flt-cx-mat.cc
libinterp/octave-value/ov-flt-re-mat.cc
libinterp/octave-value/ov-int16.cc
libinterp/octave-value/ov-int32.cc
libinterp/octave-value/ov-int64.cc
libinterp/octave-value/ov-int8.cc
libinterp/octave-value/ov-java.cc
libinterp/octave-value/ov-range.cc
libinterp/octave-value/ov-re-mat.cc
libinterp/octave-value/ov-re-sparse.cc
libinterp/octave-value/ov-scalar.cc
libinterp/octave-value/ov-str-mat.cc
libinterp/octave-value/ov-struct.cc
libinterp/octave-value/ov-typeinfo.cc
libinterp/octave-value/ov-uint16.cc
libinterp/octave-value/ov-uint32.cc
libinterp/octave-value/ov-uint64.cc
libinterp/octave-value/ov-uint8.cc
libinterp/octave.cc
libinterp/parse-tree/bp-table.cc
libinterp/parse-tree/lex.h
libinterp/parse-tree/profiler.cc
libinterp/parse-tree/pt-arg-list.cc
libinterp/parse-tree/pt-array-list.cc
libinterp/parse-tree/pt-assign.cc
libinterp/parse-tree/pt-cell.cc
libinterp/parse-tree/pt-const.cc
libinterp/parse-tree/pt-eval.cc
libinterp/parse-tree/pt-exp.cc
libinterp/parse-tree/pt-fcn-handle.cc
libinterp/parse-tree/pt-jit.cc
libinterp/parse-tree/pt-pr-code.cc
libinterp/parse-tree/pt-tm-const.cc
libinterp/parse-tree/pt.cc
liboctave/array/Array.cc
liboctave/array/CColVector.cc
liboctave/array/CDiagMatrix.cc
liboctave/array/CMatrix.cc
liboctave/array/CNDArray.cc
liboctave/array/CRowVector.cc
liboctave/array/CSparse.cc
liboctave/array/DiagArray2.cc
liboctave/array/MArray.cc
liboctave/array/Range.cc
liboctave/array/Sparse.cc
liboctave/array/boolMatrix.cc
liboctave/array/boolSparse.cc
liboctave/array/chMatrix.cc
liboctave/array/dColVector.cc
liboctave/array/dDiagMatrix.cc
liboctave/array/dMatrix.cc
liboctave/array/dNDArray.cc
liboctave/array/dRowVector.cc
liboctave/array/dSparse.cc
liboctave/array/fCColVector.cc
liboctave/array/fCDiagMatrix.cc
liboctave/array/fCMatrix.cc
liboctave/array/fCNDArray.cc
liboctave/array/fCRowVector.cc
liboctave/array/fColVector.cc
liboctave/array/fDiagMatrix.cc
liboctave/array/fMatrix.cc
liboctave/array/fNDArray.cc
liboctave/array/fRowVector.cc
liboctave/array/idx-vector.cc
liboctave/numeric/CollocWt.cc
liboctave/numeric/eigs-base.cc
liboctave/system/file-ops.cc
liboctave/system/oct-time.cc
liboctave/util/cmd-hist.cc
liboctave/util/data-conv.cc
liboctave/util/data-conv.h
liboctave/util/file-info.cc
liboctave/util/lo-utils.cc
liboctave/util/lo-utils.h
liboctave/util/quit.cc
liboctave/util/str-vec.cc
liboctave/util/url-transfer.cc
liboctave/util/url-transfer.h
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Thu, 07 Jun 2018 10:11:54 -0400 |
parents | c335f94766a7 |
children | 69fc8935020b |
line wrap: on
line source
/* Copyright (C) 2016-2018 John W. Eaton Copyright (C) 2009-2018 Michael Goffioul This file is part of Octave. Octave is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <https://www.gnu.org/licenses/>. */ #if defined (HAVE_CONFIG_H) # include "config.h" #endif #include "base-text-renderer.h" #include "ft-text-renderer.h" #if defined (HAVE_FREETYPE) #if defined (HAVE_PRAGMA_GCC_DIAGNOSTIC) # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wold-style-cast" #endif #include <ft2build.h> #include FT_FREETYPE_H #if defined (HAVE_FONTCONFIG) # include <fontconfig/fontconfig.h> #endif #if defined (HAVE_PRAGMA_GCC_DIAGNOSTIC) # pragma GCC diagnostic pop #endif #include <clocale> #include <cwchar> #include <map> #include <utility> #include "singleton-cleanup.h" #include "unistr-wrappers.h" #include "defaults.h" #include "error.h" #include "file-ops.h" #include "oct-env.h" #include "pr-output.h" #include "text-renderer.h" namespace octave { // FIXME: maybe issue at most one warning per glyph/font/size/weight // combination. static void warn_missing_glyph (FT_ULong c) { warning_with_id ("Octave:missing-glyph", "text_renderer: skipping missing glyph for character '%x'", c); } static void warn_glyph_render (FT_ULong c) { warning_with_id ("Octave:glyph-render", "text_renderer: unable to render glyph for character '%x'", c); } #if defined (_MSC_VER) // FIXME: is this really needed? // // This is just a trick to avoid multiple symbol definitions. // PermMatrix.h contains a dllexport'ed Array<octave_idx_type> // that will cause MSVC not to generate a new instantiation and // use the imported one instead. # include "PermMatrix.h" #endif // Forward declaration static void ft_face_destroyed (void *object); class ft_manager { private: ft_manager (void) : library (), freetype_initialized (false), fontconfig_initialized (false) { if (FT_Init_FreeType (&library)) error ("unable to initialize FreeType library"); else freetype_initialized = true; #if defined (HAVE_FONTCONFIG) if (! FcInit ()) error ("unable to initialize fontconfig library"); else fontconfig_initialized = true; #endif } public: // No copying! ft_manager (const ft_manager&) = delete; ft_manager& operator = (const ft_manager&) = delete; private: ~ft_manager (void) { if (freetype_initialized) FT_Done_FreeType (library); #if defined (HAVE_FONTCONFIG) // FIXME: Skip the call to FcFini because it can trigger the assertion // // octave: fccache.c:507: FcCacheFini: Assertion 'fcCacheChains[i] == ((void *)0)' failed. // // if (fontconfig_initialized) // FcFini (); #endif } public: static bool instance_ok (void) { bool retval = true; if (! instance) { instance = new ft_manager (); if (instance) singleton_cleanup_list::add (cleanup_instance); } if (! instance) error ("unable to create ft_manager!"); return retval; } static void cleanup_instance (void) { delete instance; instance = nullptr; } static FT_Face get_font (const std::string& name, const std::string& weight, const std::string& angle, double size) { return (instance_ok () ? instance->do_get_font (name, weight, angle, size) : nullptr); } static void font_destroyed (FT_Face face) { if (instance_ok ()) instance->do_font_destroyed (face); } private: static ft_manager *instance; typedef std::pair<std::string, double> ft_key; typedef std::map<ft_key, FT_Face> ft_cache; // Cache the fonts loaded by FreeType. This cache only contains // weak references to the fonts, strong references are only present // in class text_renderer. ft_cache cache; FT_Face do_get_font (const std::string& name, const std::string& weight, const std::string& angle, double size) { FT_Face retval = nullptr; #if defined (HAVE_FT_REFERENCE_FACE) // Look first into the font cache, then use fontconfig. If the font // is present in the cache, simply add a reference and return it. ft_key key (name + ':' + weight + ':' + angle, size); ft_cache::const_iterator it = cache.find (key); if (it != cache.end ()) { FT_Reference_Face (it->second); return it->second; } #endif static std::string fonts_dir; if (fonts_dir.empty ()) { fonts_dir = sys::env::getenv ("OCTAVE_FONTS_DIR"); if (fonts_dir.empty ()) #if defined (SYSTEM_FREEFONT_DIR) fonts_dir = SYSTEM_FREEFONT_DIR; #else fonts_dir = config::oct_fonts_dir (); #endif } // Default font file std::string file; if (! fonts_dir.empty ()) { file = fonts_dir + sys::file_ops::dir_sep_str () + "FreeSans"; if (weight == "bold") file += "Bold"; if (angle == "italic" || angle == "oblique") file += "Oblique"; file += ".otf"; } #if defined (HAVE_FONTCONFIG) if (name != "*" && fontconfig_initialized) { int fc_weight, fc_angle; if (weight == "bold") fc_weight = FC_WEIGHT_BOLD; else if (weight == "light") fc_weight = FC_WEIGHT_LIGHT; else if (weight == "demi") fc_weight = FC_WEIGHT_DEMIBOLD; else fc_weight = FC_WEIGHT_NORMAL; if (angle == "italic") fc_angle = FC_SLANT_ITALIC; else if (angle == "oblique") fc_angle = FC_SLANT_OBLIQUE; else fc_angle = FC_SLANT_ROMAN; FcPattern *pat = FcPatternCreate (); FcPatternAddString (pat, FC_FAMILY, (reinterpret_cast<const FcChar8 *> (name.c_str ()))); FcPatternAddInteger (pat, FC_WEIGHT, fc_weight); FcPatternAddInteger (pat, FC_SLANT, fc_angle); FcPatternAddDouble (pat, FC_PIXEL_SIZE, size); if (FcConfigSubstitute (nullptr, pat, FcMatchPattern)) { FcResult res; FcPattern *match; FcDefaultSubstitute (pat); match = FcFontMatch (nullptr, pat, &res); // FIXME: originally, this test also required that // res != FcResultNoMatch. Is that really needed? if (match) { unsigned char *tmp; FcPatternGetString (match, FC_FILE, 0, &tmp); file = reinterpret_cast<char *> (tmp); } else ::warning ("could not match any font: %s-%s-%s-%g, using default font", name.c_str (), weight.c_str (), angle.c_str (), size); if (match) FcPatternDestroy (match); } FcPatternDestroy (pat); } #endif if (file.empty ()) ::warning ("unable to find default font files"); else { if (FT_New_Face (library, file.c_str (), 0, &retval)) ::warning ("ft_manager: unable to load font: %s", file.c_str ()); #if defined (HAVE_FT_REFERENCE_FACE) else { // Install a finalizer to notify ft_manager that the font is // being destroyed. The class ft_manager only keeps weak // references to font objects. retval->generic.data = new ft_key (key); retval->generic.finalizer = ft_face_destroyed; // Insert loaded font into the cache. cache[key] = retval; } #endif } return retval; } void do_font_destroyed (FT_Face face) { if (face->generic.data) { ft_key *pkey = reinterpret_cast<ft_key *> (face->generic.data); cache.erase (*pkey); delete pkey; face->generic.data = nullptr; } } private: FT_Library library; bool freetype_initialized; bool fontconfig_initialized; }; ft_manager *ft_manager::instance = nullptr; static void ft_face_destroyed (void *object) { ft_manager::font_destroyed (reinterpret_cast<FT_Face> (object)); } class OCTINTERP_API ft_text_renderer : public base_text_renderer { public: enum { MODE_BBOX = 0, MODE_RENDER = 1 }; enum { ROTATION_0 = 0, ROTATION_90 = 1, ROTATION_180 = 2, ROTATION_270 = 3 }; public: ft_text_renderer (void) : base_text_renderer (), font (), bbox (1, 4, 0.0), halign (0), xoffset (0), line_yoffset (0), yoffset (0), mode (MODE_BBOX), color (dim_vector (1, 3), 0) { } // No copying! ft_text_renderer (const ft_text_renderer&) = delete; ft_text_renderer& operator = (const ft_text_renderer&) = delete; ~ft_text_renderer (void) = default; void visit (text_element_string& e); void visit (text_element_list& e); void visit (text_element_subscript& e); void visit (text_element_superscript& e); void visit (text_element_color& e); void visit (text_element_fontsize& e); void visit (text_element_fontname& e); void visit (text_element_fontstyle& e); void visit (text_element_symbol& e); void visit (text_element_combined& e); void reset (void); uint8NDArray get_pixels (void) const { return pixels; } Matrix get_boundingbox (void) const { return bbox; } uint8NDArray render (text_element *elt, Matrix& box, int rotation = ROTATION_0); Matrix get_extent (text_element *elt, double rotation = 0.0); Matrix get_extent (const std::string& txt, double rotation, const caseless_str& interpreter); void set_font (const std::string& name, const std::string& weight, const std::string& angle, double size); void set_color (const Matrix& c); void set_mode (int m); void text_to_pixels (const std::string& txt, uint8NDArray& pxls, Matrix& bbox, int halign, int valign, double rotation, const caseless_str& interpreter, bool handle_rotation); private: int rotation_to_mode (double rotation) const; // Class to hold information about fonts and a strong // reference to the font objects loaded by FreeType. class ft_font : public text_renderer::font { public: ft_font (void) : text_renderer::font (), face (nullptr) { } ft_font (const std::string& nm, const std::string& wt, const std::string& ang, double sz, FT_Face f = nullptr) : text_renderer::font (nm, wt, ang, sz), face (f) { } ft_font (const ft_font& ft); ~ft_font (void) { if (face) FT_Done_Face (face); } ft_font& operator = (const ft_font& ft); bool is_valid (void) const { return get_face (); } FT_Face get_face (void) const; private: mutable FT_Face face; }; void push_new_line (void); void update_line_bbox (void); void compute_bbox (void); int compute_line_xoffset (const Matrix& lb) const; FT_UInt process_character (FT_ULong code, FT_UInt previous = 0); public: void text_to_strlist (const std::string& txt, std::list<text_renderer::string>& lst, Matrix& bbox, int halign, int valign, double rotation, const caseless_str& interp); private: // The current font used by the renderer. ft_font font; // Used to stored the bounding box corresponding to the rendered text. // The bounding box has the form [x, y, w, h] where x and y represent the // coordinates of the bottom left corner relative to the anchor point of // the text (== start of text on the baseline). Due to font descent or // multiple lines, the value y is usually negative. Matrix bbox; // Used to stored the rendered text. It's a 3D matrix with size MxNx4 // where M and N are the width and height of the bounding box. uint8NDArray pixels; // Used to store the bounding box of each line. This is used to layout // multiline text properly. std::list<Matrix> line_bbox; // The current horizontal alignment. This is used to align multi-line text. int halign; // The X offset for the next glyph. int xoffset; // The Y offset of the baseline for the current line. int line_yoffset; // The Y offset of the baseline for the next glyph. The offset is relative // to line_yoffset. The total Y offset is computed with: // line_yoffset + yoffset. int yoffset; // The current mode of the rendering process (box computing or rendering). int mode; // The base color of the rendered text. uint8NDArray color; // A list of parsed strings to be used for printing. std::list<text_renderer::string> strlist; // The X offset of the baseline for the current line. int line_xoffset; }; void ft_text_renderer::set_font (const std::string& name, const std::string& weight, const std::string& angle, double size) { // FIXME: take "fontunits" into account font = ft_font (name, weight, angle, size, nullptr); } void ft_text_renderer::push_new_line (void) { switch (mode) { case MODE_BBOX: { // Create a new bbox entry based on the current font. FT_Face face = font.get_face (); if (face) { int asc = face->size->metrics.ascender >> 6; int desc = face->size->metrics.descender >> 6; int h = face->size->metrics.height >> 6; Matrix bb (1, 5, 0.0); bb(1) = desc; bb(3) = asc - desc; bb(4) = h; line_bbox.push_back (bb); xoffset = yoffset = 0; } } break; case MODE_RENDER: { // Move to the next line bbox, adjust xoffset based on alignment // and yoffset based on the old and new line bbox. Matrix old_bbox = line_bbox.front (); line_bbox.pop_front (); Matrix new_bbox = line_bbox.front (); xoffset = line_xoffset = compute_line_xoffset (new_bbox); line_yoffset += (old_bbox(1) - (new_bbox(1) + new_bbox(3))); yoffset = 0; } break; } } int ft_text_renderer::compute_line_xoffset (const Matrix& lb) const { if (! bbox.isempty ()) { switch (halign) { case 0: return 0; case 1: return (bbox(2) - lb(2)) / 2; case 2: return (bbox(2) - lb(2)); } } return 0; } void ft_text_renderer::compute_bbox (void) { // Stack the various line bbox together and compute the final // bounding box for the entire text string. bbox = Matrix (); switch (line_bbox.size ()) { case 0: break; case 1: bbox = line_bbox.front ().extract (0, 0, 0, 3); break; default: for (const auto& lbox : line_bbox) { if (bbox.isempty ()) bbox = lbox.extract (0, 0, 0, 3); else { bbox(1) -= lbox(3); bbox(3) += lbox(3); bbox(2) = math::max (bbox(2), lbox(2)); } } break; } } void ft_text_renderer::update_line_bbox (void) { // Called after a font change, when in MODE_BBOX mode, to update the // current line bbox with the new font metrics. This also includes the // current yoffset, that is the offset of the current glyph's baseline // the line's baseline. if (mode == MODE_BBOX) { int asc = font.get_face ()->size->metrics.ascender >> 6; int desc = font.get_face ()->size->metrics.descender >> 6; Matrix& bb = line_bbox.back (); if ((yoffset + desc) < bb(1)) { // The new font goes below the bottom of the current bbox. int delta = bb(1) - (yoffset + desc); bb(1) -= delta; bb(3) += delta; } if ((yoffset + asc) > (bb(1) + bb(3))) { // The new font goes above the top of the current bbox. int delta = (yoffset + asc) - (bb(1) + bb(3)); bb(3) += delta; } } } void ft_text_renderer::set_mode (int m) { mode = m; switch (mode) { case MODE_BBOX: xoffset = line_yoffset = yoffset = 0; bbox = Matrix (1, 4, 0.0); line_bbox.clear (); push_new_line (); break; case MODE_RENDER: if (bbox.numel () != 4) { ::error ("ft_text_renderer: invalid bounding box, cannot render"); xoffset = line_yoffset = yoffset = 0; pixels = uint8NDArray (); } else { dim_vector d (4, octave_idx_type (bbox(2)), octave_idx_type (bbox(3))); pixels = uint8NDArray (d, static_cast<uint8_t> (0)); xoffset = compute_line_xoffset (line_bbox.front ()); line_yoffset = -bbox(1)-1; yoffset = 0; } break; default: error ("ft_text_renderer: invalid mode '%d'", mode); break; } } FT_UInt ft_text_renderer::process_character (FT_ULong code, FT_UInt previous) { FT_Face face = font.get_face (); FT_UInt glyph_index = 0; if (face) { glyph_index = FT_Get_Char_Index (face, code); if (code != '\n' && code != '\t' && (! glyph_index || FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT))) { glyph_index = 0; warn_missing_glyph (code); } else if ((code == '\n') || (code == '\t')) { glyph_index = FT_Get_Char_Index (face, ' '); if (! glyph_index || FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT)) { glyph_index = 0; warn_missing_glyph (' '); } else if (code == '\n') push_new_line (); else { // Advance to next multiple of 4 times the width of the "space" // character. int x_tab = 4 * (face->glyph->advance.x >> 6); xoffset = (1 + std::floor (1. * xoffset / x_tab)) * x_tab; } } else { switch (mode) { case MODE_RENDER: if (FT_Render_Glyph (face->glyph, FT_RENDER_MODE_NORMAL)) { glyph_index = 0; warn_glyph_render (code); } else { FT_Bitmap& bitmap = face->glyph->bitmap; int x0, y0; if (previous) { FT_Vector delta; FT_Get_Kerning (face, previous, glyph_index, FT_KERNING_DEFAULT, &delta); xoffset += (delta.x >> 6); } x0 = xoffset + face->glyph->bitmap_left; y0 = line_yoffset + yoffset + face->glyph->bitmap_top; // 'w' seems to have a negative -1 // face->glyph->bitmap_left, this is so we don't index out // of bound, and assumes we've allocated the right amount of // horizontal space in the bbox. if (x0 < 0) x0 = 0; for (int r = 0; static_cast<unsigned int> (r) < bitmap.rows; r++) for (int c = 0; static_cast<unsigned int> (c) < bitmap.width; c++) { unsigned char pix = bitmap.buffer[r*bitmap.width+c]; if (x0+c < 0 || x0+c >= pixels.dim2 () || y0-r < 0 || y0-r >= pixels.dim3 ()) { //::warning ("ft_text_renderer: pixel out of bound (char=%d, (x,y)=(%d,%d), (w,h)=(%d,%d)", // str[i], x0+c, y0-r, pixels.dim2 (), pixels.dim3 ()); } else if (pixels(3, x0+c, y0-r).value () == 0) { pixels(0, x0+c, y0-r) = color(0); pixels(1, x0+c, y0-r) = color(1); pixels(2, x0+c, y0-r) = color(2); pixels(3, x0+c, y0-r) = pix; } } xoffset += (face->glyph->advance.x >> 6); } break; case MODE_BBOX: Matrix& bb = line_bbox.back (); // If we have a previous glyph, use kerning information. This // usually means moving a bit backward before adding the next // glyph. That is, "delta.x" is usually < 0. if (previous) { FT_Vector delta; FT_Get_Kerning (face, previous, glyph_index, FT_KERNING_DEFAULT, &delta); xoffset += (delta.x >> 6); } // Extend current X offset box by the width of the current // glyph. Then extend the line bounding box if necessary. xoffset += (face->glyph->advance.x >> 6); bb(2) = math::max (bb(2), xoffset); break; } } } return glyph_index; } void ft_text_renderer::text_to_strlist (const std::string& txt, std::list<text_renderer::string>& lst, Matrix& box, int ha, int va, double rot, const caseless_str& interp) { uint8NDArray pxls; // First run text_to_pixels which will also build the string list text_to_pixels (txt, pxls, box, ha, va, rot, interp, false); lst = strlist; } void ft_text_renderer::visit (text_element_string& e) { if (font.is_valid ()) { FT_UInt glyph_index, previous = 0; std::string str = e.string_value (); size_t n; // convert str to UTF-32 uint32_t *u32_str; u32_str = octave_u8_to_u32_wrapper (reinterpret_cast<const uint8_t *> (str.c_str ()), str.length (), nullptr, &n); if (! u32_str) error ("ft_text_renderer: converting from UTF-8 to UTF-32: %s", std::strerror (errno)); size_t curr = 0; size_t idx = 0; std::string fname = font.get_face ()->family_name; text_renderer::string fs (str, font, xoffset, yoffset); std::vector<double> xdata; while (n > 0) { n -= 1; if (u32_str[curr] == 10) { // Finish previous string in strlist before processing // the newline character fs.set_y (line_yoffset + yoffset); fs.set_color (color); // FIXME: Do we have to convert back to UTF-8 and keep strlist // in sync? Might fail with multi-byte characters as it is now. std::string s = str.substr (idx, curr - idx); if (! s.empty ()) { fs.set_string (s); fs.set_xdata (xdata); fs.set_family (fname); strlist.push_back (fs); } } else xdata.push_back (xoffset); glyph_index = process_character (u32_str[curr], previous); if (u32_str[curr] == 10) { previous = 0; // Start a new string in strlist idx = curr+1; xdata.clear (); // FIXME: Do we have to convert back to UTF-8 and keep strlist // in sync? Might fail with multi-byte characters as it is now. fs = text_renderer::string (str.substr (idx), font, line_xoffset, yoffset); } else previous = glyph_index; curr += 1; } if (! fs.get_string ().empty ()) { fs.set_y (line_yoffset + yoffset); fs.set_color (color); fs.set_xdata (xdata); fs.set_family (fname); strlist.push_back (fs); } } } void ft_text_renderer::visit (text_element_list& e) { // Save and restore (after processing the list) the current font and color. ft_font saved_font (font); uint8NDArray saved_color (color); text_processor::visit (e); font = saved_font; color = saved_color; } void ft_text_renderer::visit (text_element_subscript& e) { ft_font saved_font (font); int saved_line_yoffset = line_yoffset; int saved_yoffset = yoffset; set_font (font.get_name (), font.get_weight (), font.get_angle (), font.get_size () - 2); if (font.is_valid ()) { int h = font.get_face ()->size->metrics.height >> 6; // Shifting the baseline by 2/3 the font height seems to produce // decent result. yoffset -= (h * 2) / 3; if (mode == MODE_BBOX) update_line_bbox (); } text_processor::visit (e); font = saved_font; // If line_yoffset changed, this means we moved to a new line; hence yoffset // cannot be restored, because the saved value is not relevant anymore. if (line_yoffset == saved_line_yoffset) yoffset = saved_yoffset; } void ft_text_renderer::visit (text_element_superscript& e) { ft_font saved_font (font); int saved_line_yoffset = line_yoffset; int saved_yoffset = yoffset; set_font (font.get_name (), font.get_weight (), font.get_angle (), font.get_size () - 2); if (saved_font.is_valid ()) { int s_asc = saved_font.get_face ()->size->metrics.ascender >> 6; // Shifting the baseline by 2/3 base font ascender seems to produce // decent result. yoffset += (s_asc * 2) / 3; if (mode == MODE_BBOX) update_line_bbox (); } text_processor::visit (e); font = saved_font; // If line_yoffset changed, this means we moved to a new line; hence yoffset // cannot be restored, because the saved value is not relevant anymore. if (line_yoffset == saved_line_yoffset) yoffset = saved_yoffset; } void ft_text_renderer::visit (text_element_color& e) { if (mode == MODE_RENDER) set_color (e.get_color ()); } void ft_text_renderer::visit (text_element_fontsize& e) { double sz = e.get_fontsize (); // FIXME: Matlab documentation says that the font size is expressed // in the text object FontUnit. set_font (font.get_name (), font.get_weight (), font.get_angle (), sz); if (mode == MODE_BBOX) update_line_bbox (); } void ft_text_renderer::visit (text_element_fontname& e) { set_font (e.get_fontname (), font.get_weight (), font.get_angle (), font.get_size ()); if (mode == MODE_BBOX) update_line_bbox (); } void ft_text_renderer::visit (text_element_fontstyle& e) { switch (e.get_fontstyle ()) { case text_element_fontstyle::normal: set_font (font.get_name (), "normal", "normal", font.get_size ()); break; case text_element_fontstyle::bold: set_font (font.get_name (), "bold", "normal", font.get_size ()); break; case text_element_fontstyle::italic: set_font (font.get_name (), "normal", "italic", font.get_size ()); break; case text_element_fontstyle::oblique: set_font (font.get_name (), "normal", "oblique", font.get_size ()); break; } if (mode == MODE_BBOX) update_line_bbox (); } void ft_text_renderer::visit (text_element_symbol& e) { uint32_t code = e.get_symbol_code (); std::vector<double> xdata (1, xoffset); text_renderer::string fs ("-", font, xoffset, yoffset); if (code != text_element_symbol::invalid_code && font.is_valid ()) { process_character (code); fs.set_code (code); fs.set_xdata (xdata); } else if (font.is_valid ()) ::warning ("ignoring unknown symbol: %d", e.get_symbol ()); if (fs.get_code ()) { fs.set_y (line_yoffset + yoffset); fs.set_color (color); fs.set_family (font.get_face ()->family_name); strlist.push_back (fs); } } void ft_text_renderer::visit (text_element_combined& e) { int saved_xoffset = xoffset; int max_xoffset = xoffset; for (auto *txt_elt : e) { xoffset = saved_xoffset; txt_elt->accept (*this); max_xoffset = math::max (xoffset, max_xoffset); } xoffset = max_xoffset; } void ft_text_renderer::reset (void) { set_mode (MODE_BBOX); set_color (Matrix (1, 3, 0.0)); } void ft_text_renderer::set_color (const Matrix& c) { if (c.numel () == 3) { color(0) = static_cast<uint8_t> (c(0)*255); color(1) = static_cast<uint8_t> (c(1)*255); color(2) = static_cast<uint8_t> (c(2)*255); } else ::warning ("ft_text_renderer::set_color: invalid color"); } uint8NDArray ft_text_renderer::render (text_element *elt, Matrix& box, int rotation) { set_mode (MODE_BBOX); elt->accept (*this); compute_bbox (); box = bbox; set_mode (MODE_RENDER); // Clear the list of parsed strings strlist.clear (); if (pixels.numel () > 0) { elt->accept (*this); switch (rotation) { case ROTATION_0: break; case ROTATION_90: { Array<octave_idx_type> perm (dim_vector (3, 1)); perm(0) = 0; perm(1) = 2; perm(2) = 1; pixels = pixels.permute (perm); Array<idx_vector> idx (dim_vector (3, 1)); idx(0) = idx_vector (':'); idx(1) = idx_vector (pixels.dim2 ()-1, -1, -1); idx(2) = idx_vector (':'); pixels = uint8NDArray (pixels.index (idx)); } break; case ROTATION_180: { Array<idx_vector> idx (dim_vector (3, 1)); idx(0) = idx_vector (':'); idx(1) = idx_vector (pixels.dim2 ()-1, -1, -1); idx(2) = idx_vector (pixels.dim3 ()-1, -1, -1); pixels = uint8NDArray (pixels.index (idx)); } break; case ROTATION_270: { Array<octave_idx_type> perm (dim_vector (3, 1)); perm(0) = 0; perm(1) = 2; perm(2) = 1; pixels = pixels.permute (perm); Array<idx_vector> idx (dim_vector (3, 1)); idx(0) = idx_vector (':'); idx(1) = idx_vector (':'); idx(2) = idx_vector (pixels.dim3 ()-1, -1, -1); pixels = uint8NDArray (pixels.index (idx)); } break; } } return pixels; } // Note: // x-extent accurately measures width of glyphs. // y-extent is overly large because it is measured from baseline-to-baseline. // Calling routines, such as ylabel, may need to account for this mismatch. Matrix ft_text_renderer::get_extent (text_element *elt, double rotation) { set_mode (MODE_BBOX); elt->accept (*this); compute_bbox (); Matrix extent (1, 2, 0.0); switch (rotation_to_mode (rotation)) { case ROTATION_0: case ROTATION_180: extent(0) = bbox(2); extent(1) = bbox(3); break; case ROTATION_90: case ROTATION_270: extent(0) = bbox(3); extent(1) = bbox(2); } return extent; } Matrix ft_text_renderer::get_extent (const std::string& txt, double rotation, const caseless_str& interpreter) { text_element *elt = text_parser::parse (txt, interpreter); Matrix extent = get_extent (elt, rotation); delete elt; return extent; } int ft_text_renderer::rotation_to_mode (double rotation) const { // Clip rotation to range [0, 360] while (rotation < 0) rotation += 360.0; while (rotation > 360.0) rotation -= 360.0; if (rotation == 0.0) return ROTATION_0; else if (rotation == 90.0) return ROTATION_90; else if (rotation == 180.0) return ROTATION_180; else if (rotation == 270.0) return ROTATION_270; else return ROTATION_0; } void ft_text_renderer::text_to_pixels (const std::string& txt, uint8NDArray& pxls, Matrix& box, int _halign, int valign, double rotation, const caseless_str& interpreter, bool handle_rotation) { int rot_mode = rotation_to_mode (rotation); halign = _halign; text_element *elt = text_parser::parse (txt, interpreter); pxls = render (elt, box, rot_mode); delete elt; if (pxls.isempty ()) return; // nothing to render switch (halign) { case 1: box(0) = -box(2)/2; break; case 2: box(0) = -box(2); break; default: box(0) = 0; break; } switch (valign) { case 1: box(1) = -box(3)/2; break; case 2: box(1) = -box(3); break; case 3: break; case 4: box(1) = -box(3)-box(1); break; default: box(1) = 0; break; } if (handle_rotation) { switch (rot_mode) { case ROTATION_90: std::swap (box(0), box(1)); std::swap (box(2), box(3)); box(0) = -box(0)-box(2); break; case ROTATION_180: box(0) = -box(0)-box(2); box(1) = -box(1)-box(3); break; case ROTATION_270: std::swap (box(0), box(1)); std::swap (box(2), box(3)); box(1) = -box(1)-box(3); break; } } } ft_text_renderer::ft_font::ft_font (const ft_font& ft) : text_renderer::font (ft), face (nullptr) { #if defined (HAVE_FT_REFERENCE_FACE) FT_Face ft_face = ft.get_face (); if (ft_face && FT_Reference_Face (ft_face) == 0) face = ft_face; #endif } ft_text_renderer::ft_font& ft_text_renderer::ft_font::operator = (const ft_font& ft) { if (&ft != this) { text_renderer::font::operator = (ft); if (face) { FT_Done_Face (face); face = nullptr; } #if defined (HAVE_FT_REFERENCE_FACE) FT_Face ft_face = ft.get_face (); if (ft_face && FT_Reference_Face (ft_face) == 0) face = ft_face; #endif } return *this; } FT_Face ft_text_renderer::ft_font::get_face (void) const { if (! face && ! name.empty ()) { face = ft_manager::get_font (name, weight, angle, size); if (face) { if (FT_Set_Char_Size (face, 0, size*64, 0, 0)) ::warning ("ft_text_renderer: unable to set font size to %g", size); } else ::warning ("ft_text_renderer: unable to load appropriate font"); } return face; } } #endif namespace octave { base_text_renderer * make_ft_text_renderer (void) { #if defined (HAVE_FREETYPE) return new ft_text_renderer (); #else return 0; #endif } }