kc3-lang/harfbuzz/src/hb-paint-extents.cc

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• Hash : 47089fe7
  Author :
  Date : 2025-05-28T17:10:22
  

  Big misc changes
  
  - Make geometry types into templates taking float or double.
  - Changes to paint() transform elimination.
  - Add font->has_nonzero_coords and use it across.
  - Extensions to avar processing for otherwise invalid mappings.
  

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• src/hb-paint-extents.cc

• /*
   * Copyright © 2022 Behdad Esfahbod
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   */
  
  #include "hb.hh"
  
  #ifndef HB_NO_PAINT
  
  #include "hb-paint-extents.hh"
  
  #include "hb-draw.hh"
  
  #include "hb-machinery.hh"
  
  
  /*
   * This file implements bounds-extraction computation of COLRv1 fonts as described in:
   *
   * https://learn.microsoft.com/en-us/typography/opentype/spec/colr#glyph-metrics-and-boundedness
   */
  
  static void
  hb_paint_extents_push_transform (hb_paint_funcs_t *funcs HB_UNUSED,
  				 void *paint_data,
  				 float xx, float yx,
  				 float xy, float yy,
  				 float dx, float dy,
  				 void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->push_transform (hb_transform_t<> {xx, yx, xy, yy, dx, dy});
  }
  
  static void
  hb_paint_extents_pop_transform (hb_paint_funcs_t *funcs HB_UNUSED,
  			        void *paint_data,
  				void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->pop_transform ();
  }
  
  static void
  hb_paint_extents_push_clip_glyph (hb_paint_funcs_t *funcs HB_UNUSED,
  				  void *paint_data,
  				  hb_codepoint_t glyph,
  				  hb_font_t *font,
  				  void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    hb_extents_t<> extents;
    hb_draw_funcs_t *draw_extent_funcs = hb_draw_extents_get_funcs ();
    hb_font_draw_glyph (font, glyph, draw_extent_funcs, &extents);
    c->push_clip (extents);
  }
  
  static void
  hb_paint_extents_push_clip_rectangle (hb_paint_funcs_t *funcs HB_UNUSED,
  				      void *paint_data,
  				      float xmin, float ymin, float xmax, float ymax,
  				      void *user_data)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    hb_extents_t<> extents = {xmin, ymin, xmax, ymax};
    c->push_clip (extents);
  }
  
  static void
  hb_paint_extents_pop_clip (hb_paint_funcs_t *funcs HB_UNUSED,
  			   void *paint_data,
  			   void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->pop_clip ();
  }
  
  static void
  hb_paint_extents_push_group (hb_paint_funcs_t *funcs HB_UNUSED,
  			     void *paint_data,
  			     void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->push_group ();
  }
  
  static void
  hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED,
  			    void *paint_data,
  			    hb_paint_composite_mode_t mode,
  			    void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->pop_group (mode);
  }
  
  static hb_bool_t
  hb_paint_extents_paint_image (hb_paint_funcs_t *funcs HB_UNUSED,
  			      void *paint_data,
  			      hb_blob_t *blob HB_UNUSED,
  			      unsigned int width HB_UNUSED,
  			      unsigned int height HB_UNUSED,
  			      hb_tag_t format HB_UNUSED,
  			      float slant HB_UNUSED,
  			      hb_glyph_extents_t *glyph_extents,
  			      void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    if (!glyph_extents)
      return false; // Happens with SVG images.
  
    hb_extents_t<> extents = {(float) glyph_extents->x_bearing,
  			    (float) glyph_extents->y_bearing + glyph_extents->height,
  			    (float) glyph_extents->x_bearing + glyph_extents->width,
  			    (float) glyph_extents->y_bearing};
    c->push_clip (extents);
    c->paint ();
    c->pop_clip ();
  
    return true;
  }
  
  static void
  hb_paint_extents_paint_color (hb_paint_funcs_t *funcs HB_UNUSED,
  			      void *paint_data,
  			      hb_bool_t use_foreground HB_UNUSED,
  			      hb_color_t color HB_UNUSED,
  			      void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->paint ();
  }
  
  static void
  hb_paint_extents_paint_linear_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
  				        void *paint_data,
  				        hb_color_line_t *color_line HB_UNUSED,
  				        float x0 HB_UNUSED, float y0 HB_UNUSED,
  				        float x1 HB_UNUSED, float y1 HB_UNUSED,
  				        float x2 HB_UNUSED, float y2 HB_UNUSED,
  				        void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->paint ();
  }
  
  static void
  hb_paint_extents_paint_radial_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
  				        void *paint_data,
  				        hb_color_line_t *color_line HB_UNUSED,
  				        float x0 HB_UNUSED, float y0 HB_UNUSED, float r0 HB_UNUSED,
  				        float x1 HB_UNUSED, float y1 HB_UNUSED, float r1 HB_UNUSED,
  				        void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->paint ();
  }
  
  static void
  hb_paint_extents_paint_sweep_gradient (hb_paint_funcs_t *funcs HB_UNUSED,
  				       void *paint_data,
  				       hb_color_line_t *color_line HB_UNUSED,
  				       float cx HB_UNUSED, float cy HB_UNUSED,
  				       float start_angle HB_UNUSED,
  				       float end_angle HB_UNUSED,
  				       void *user_data HB_UNUSED)
  {
    hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
  
    c->paint ();
  }
  
  static inline void free_static_paint_extents_funcs ();
  
  static struct hb_paint_extents_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_paint_extents_funcs_lazy_loader_t>
  {
    static hb_paint_funcs_t *create ()
    {
      hb_paint_funcs_t *funcs = hb_paint_funcs_create ();
  
      hb_paint_funcs_set_push_transform_func (funcs, hb_paint_extents_push_transform, nullptr, nullptr);
      hb_paint_funcs_set_pop_transform_func (funcs, hb_paint_extents_pop_transform, nullptr, nullptr);
      hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_paint_extents_push_clip_glyph, nullptr, nullptr);
      hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_paint_extents_push_clip_rectangle, nullptr, nullptr);
      hb_paint_funcs_set_pop_clip_func (funcs, hb_paint_extents_pop_clip, nullptr, nullptr);
      hb_paint_funcs_set_push_group_func (funcs, hb_paint_extents_push_group, nullptr, nullptr);
      hb_paint_funcs_set_pop_group_func (funcs, hb_paint_extents_pop_group, nullptr, nullptr);
      hb_paint_funcs_set_color_func (funcs, hb_paint_extents_paint_color, nullptr, nullptr);
      hb_paint_funcs_set_image_func (funcs, hb_paint_extents_paint_image, nullptr, nullptr);
      hb_paint_funcs_set_linear_gradient_func (funcs, hb_paint_extents_paint_linear_gradient, nullptr, nullptr);
      hb_paint_funcs_set_radial_gradient_func (funcs, hb_paint_extents_paint_radial_gradient, nullptr, nullptr);
      hb_paint_funcs_set_sweep_gradient_func (funcs, hb_paint_extents_paint_sweep_gradient, nullptr, nullptr);
  
      hb_paint_funcs_make_immutable (funcs);
  
      hb_atexit (free_static_paint_extents_funcs);
  
      return funcs;
    }
  } static_paint_extents_funcs;
  
  static inline
  void free_static_paint_extents_funcs ()
  {
    static_paint_extents_funcs.free_instance ();
  }
  
  hb_paint_funcs_t *
  hb_paint_extents_get_funcs ()
  {
    return static_paint_extents_funcs.get_unconst ();
  }
  
  
  #endif
  

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