gfx/harfbuzz/src/hb-cairo-utils.hh

   1 /*
   2  * Copyright © 2022  Red Hat, Inc
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Google Author(s): Matthias Clasen
  25  */
  26
  27 #ifndef HB_CAIRO_UTILS_H
  28 #define HB_CAIRO_UTILS_H
  29
  30 #include "hb.hh"
  31 #include "hb-cairo.h"
  32
  33
  34 typedef struct
  35 {
  36   cairo_scaled_font_t *scaled_font;
  37   cairo_t *cr;
  38   hb_map_t *color_cache;
  39 } hb_cairo_context_t;
  40
  41 static inline cairo_operator_t
  42 _hb_paint_composite_mode_to_cairo (hb_paint_composite_mode_t mode)
  43 {
  44   switch (mode)
  45     {
  46     case HB_PAINT_COMPOSITE_MODE_CLEAR: return CAIRO_OPERATOR_CLEAR;
  47     case HB_PAINT_COMPOSITE_MODE_SRC: return CAIRO_OPERATOR_SOURCE;
  48     case HB_PAINT_COMPOSITE_MODE_DEST: return CAIRO_OPERATOR_DEST;
  49     case HB_PAINT_COMPOSITE_MODE_SRC_OVER: return CAIRO_OPERATOR_OVER;
  50     case HB_PAINT_COMPOSITE_MODE_DEST_OVER: return CAIRO_OPERATOR_DEST_OVER;
  51     case HB_PAINT_COMPOSITE_MODE_SRC_IN: return CAIRO_OPERATOR_IN;
  52     case HB_PAINT_COMPOSITE_MODE_DEST_IN: return CAIRO_OPERATOR_DEST_IN;
  53     case HB_PAINT_COMPOSITE_MODE_SRC_OUT: return CAIRO_OPERATOR_OUT;
  54     case HB_PAINT_COMPOSITE_MODE_DEST_OUT: return CAIRO_OPERATOR_DEST_OUT;
  55     case HB_PAINT_COMPOSITE_MODE_SRC_ATOP: return CAIRO_OPERATOR_ATOP;
  56     case HB_PAINT_COMPOSITE_MODE_DEST_ATOP: return CAIRO_OPERATOR_DEST_ATOP;
  57     case HB_PAINT_COMPOSITE_MODE_XOR: return CAIRO_OPERATOR_XOR;
  58     case HB_PAINT_COMPOSITE_MODE_PLUS: return CAIRO_OPERATOR_ADD;
  59     case HB_PAINT_COMPOSITE_MODE_SCREEN: return CAIRO_OPERATOR_SCREEN;
  60     case HB_PAINT_COMPOSITE_MODE_OVERLAY: return CAIRO_OPERATOR_OVERLAY;
  61     case HB_PAINT_COMPOSITE_MODE_DARKEN: return CAIRO_OPERATOR_DARKEN;
  62     case HB_PAINT_COMPOSITE_MODE_LIGHTEN: return CAIRO_OPERATOR_LIGHTEN;
  63     case HB_PAINT_COMPOSITE_MODE_COLOR_DODGE: return CAIRO_OPERATOR_COLOR_DODGE;
  64     case HB_PAINT_COMPOSITE_MODE_COLOR_BURN: return CAIRO_OPERATOR_COLOR_BURN;
  65     case HB_PAINT_COMPOSITE_MODE_HARD_LIGHT: return CAIRO_OPERATOR_HARD_LIGHT;
  66     case HB_PAINT_COMPOSITE_MODE_SOFT_LIGHT: return CAIRO_OPERATOR_SOFT_LIGHT;
  67     case HB_PAINT_COMPOSITE_MODE_DIFFERENCE: return CAIRO_OPERATOR_DIFFERENCE;
  68     case HB_PAINT_COMPOSITE_MODE_EXCLUSION: return CAIRO_OPERATOR_EXCLUSION;
  69     case HB_PAINT_COMPOSITE_MODE_MULTIPLY: return CAIRO_OPERATOR_MULTIPLY;
  70     case HB_PAINT_COMPOSITE_MODE_HSL_HUE: return CAIRO_OPERATOR_HSL_HUE;
  71     case HB_PAINT_COMPOSITE_MODE_HSL_SATURATION: return CAIRO_OPERATOR_HSL_SATURATION;
  72     case HB_PAINT_COMPOSITE_MODE_HSL_COLOR: return CAIRO_OPERATOR_HSL_COLOR;
  73     case HB_PAINT_COMPOSITE_MODE_HSL_LUMINOSITY: return CAIRO_OPERATOR_HSL_LUMINOSITY;
  74     default: return CAIRO_OPERATOR_CLEAR;
  75     }
  76 }
  77
  78 HB_INTERNAL hb_bool_t
  79 _hb_cairo_paint_glyph_image (hb_cairo_context_t *c,
  80                              hb_blob_t *blob,
  81                              unsigned width,
  82                              unsigned height,
  83                              hb_tag_t format,
  84                              float slant,
  85                              hb_glyph_extents_t *extents);
  86
  87 HB_INTERNAL void
  88 _hb_cairo_paint_linear_gradient (hb_cairo_context_t *c,
  89                                  hb_color_line_t *color_line,
  90                                  float x0, float y0,
  91                                  float x1, float y1,
  92                                  float x2, float y2);
  93
  94 HB_INTERNAL void
  95 _hb_cairo_paint_radial_gradient (hb_cairo_context_t *c,
  96                                  hb_color_line_t *color_line,
  97                                  float x0, float y0, float r0,
  98                                  float x1, float y1, float r1);
  99
 100 HB_INTERNAL void
 101 _hb_cairo_paint_sweep_gradient (hb_cairo_context_t *c,
 102                                 hb_color_line_t *color_line,
 103                                 float x0, float y0,
 104                                 float start_angle, float end_angle);
 105
 106
 107 #endif /* HB_CAIRO_UTILS_H */