kc3-lang/harfbuzz/src/hb-paint.hh

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• Hash : a935e4b0
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  Date : 2022-12-17T12:59:58
  

  [paint] Add synthetic slant to root transform
  

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• src/hb-paint.hh

• /*
   * Copyright © 2022 Matthias Clasen
   *
   *  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.
   */
  
  #ifndef HB_PAINT_HH
  #define HB_PAINT_HH
  
  #include "hb.hh"
  #include "hb-face.hh"
  #include "hb-font.hh"
  
  #define HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS \
    HB_PAINT_FUNC_IMPLEMENT (push_transform) \
    HB_PAINT_FUNC_IMPLEMENT (pop_transform) \
    HB_PAINT_FUNC_IMPLEMENT (push_clip_glyph) \
    HB_PAINT_FUNC_IMPLEMENT (push_clip_rectangle) \
    HB_PAINT_FUNC_IMPLEMENT (pop_clip) \
    HB_PAINT_FUNC_IMPLEMENT (color) \
    HB_PAINT_FUNC_IMPLEMENT (image) \
    HB_PAINT_FUNC_IMPLEMENT (linear_gradient) \
    HB_PAINT_FUNC_IMPLEMENT (radial_gradient) \
    HB_PAINT_FUNC_IMPLEMENT (sweep_gradient) \
    HB_PAINT_FUNC_IMPLEMENT (push_group) \
    HB_PAINT_FUNC_IMPLEMENT (pop_group) \
    /* ^--- Add new callbacks here */
  
  struct hb_paint_funcs_t
  {
    hb_object_header_t header;
  
    struct {
  #define HB_PAINT_FUNC_IMPLEMENT(name) hb_paint_##name##_func_t name;
      HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_PAINT_FUNC_IMPLEMENT
    } func;
  
    struct {
  #define HB_PAINT_FUNC_IMPLEMENT(name) void *name;
      HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_PAINT_FUNC_IMPLEMENT
    } *user_data;
  
    struct {
  #define HB_PAINT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
      HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS
  #undef HB_PAINT_FUNC_IMPLEMENT
    } *destroy;
  
    void push_transform (void *paint_data,
                         float xx, float yx,
                         float xy, float yy,
                         float dx, float dy)
    { func.push_transform (this, paint_data,
                           xx, yx, xy, yy, dx, dy,
                           !user_data ? nullptr : user_data->push_transform); }
    void pop_transform (void *paint_data)
    { func.pop_transform (this, paint_data,
                          !user_data ? nullptr : user_data->pop_transform); }
    void push_clip_glyph (void *paint_data,
                          hb_codepoint_t glyph)
    { func.push_clip_glyph (this, paint_data,
                            glyph,
                            !user_data ? nullptr : user_data->push_clip_glyph); }
    void push_clip_rectangle (void *paint_data,
                              float xmin, float ymin, float xmax, float ymax)
    { func.push_clip_rectangle (this, paint_data,
                                xmin, ymin, xmax, ymax,
                                !user_data ? nullptr : user_data->push_clip_rectangle); }
    void pop_clip (void *paint_data)
    { func.pop_clip (this, paint_data,
                     !user_data ? nullptr : user_data->pop_clip); }
    void color (void *paint_data,
                unsigned int color_index,
                float alpha)
    { func.color (this, paint_data,
                  color_index, alpha,
                  !user_data ? nullptr : user_data->color); }
    void image (void *paint_data,
                hb_blob_t *image,
                hb_tag_t format,
                hb_glyph_extents_t *extents)
    { func.image (this, paint_data,
                  image, format, extents,
                  !user_data ? nullptr : user_data->image); }
    void linear_gradient (void *paint_data,
                          hb_color_line_t *color_line,
                          float x0, float y0,
                          float x1, float y1,
                          float x2, float y2)
    { func.linear_gradient (this, paint_data,
                            color_line, x0, y0, x1, y1, x2, y2,
                            !user_data ? nullptr : user_data->linear_gradient); }
    void radial_gradient (void *paint_data,
                          hb_color_line_t *color_line,
                          float x0, float y0, float r0,
                          float x1, float y1, float r1)
    { func.radial_gradient (this, paint_data,
                            color_line, x0, y0, r0, x1, y1, r1,
                            !user_data ? nullptr : user_data->radial_gradient); }
    void sweep_gradient (void *paint_data,
                         hb_color_line_t *color_line,
                         float x0, float y0,
                         float start_angle,
                         float end_angle)
    { func.sweep_gradient (this, paint_data,
                           color_line, x0, y0, start_angle, end_angle,
                           !user_data ? nullptr : user_data->sweep_gradient); }
    void push_group (void *paint_data)
    { func.push_group (this, paint_data,
                       !user_data ? nullptr : user_data->push_group); }
    void pop_group (void *paint_data,
                    hb_paint_composite_mode_t mode)
    { func.pop_group (this, paint_data,
                      mode,
                      !user_data ? nullptr : user_data->pop_group); }
  
    void push_root_transform (void *paint_data,
                              hb_font_t *font)
    {
      int xscale = font->x_scale, yscale = font->y_scale;
      float upem = font->face->get_upem ();
      float slant = font->slant_xy;
  
      func.push_transform (this, paint_data, xscale/upem, 0, slant * yscale/upem, yscale/upem, 0, 0,
                           !user_data ? nullptr : user_data->push_transform);
    }
    void pop_root_transform (void *paint_data)
    {
      func.pop_transform (this, paint_data,
                          !user_data ? nullptr : user_data->pop_transform);
    }
  };
  DECLARE_NULL_INSTANCE (hb_paint_funcs_t);
  
  #endif /* HB_PAINT_HH */
  

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