src/cairo-shape-mask-compositor.c

   1 /* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
   2 /* cairo - a vector graphics library with display and print output
   3  *
   4  * Copyright © 2012 Intel Corporation
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it either under the terms of the GNU Lesser General Public
   8  * License version 2.1 as published by the Free Software Foundation
   9  * (the "LGPL") or, at your option, under the terms of the Mozilla
  10  * Public License Version 1.1 (the "MPL"). If you do not alter this
  11  * notice, a recipient may use your version of this file under either
  12  * the MPL or the LGPL.
  13  *
  14  * You should have received a copy of the LGPL along with this library
  15  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  17  * You should have received a copy of the MPL along with this library
  18  * in the file COPYING-MPL-1.1
  19  *
  20  * The contents of this file are subject to the Mozilla Public License
  21  * Version 1.1 (the "License"); you may not use this file except in
  22  * compliance with the License. You may obtain a copy of the License at
  23  * http://www.mozilla.org/MPL/
  24  *
  25  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  26  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  27  * the specific language governing rights and limitations.
  28  *
  29  * The Original Code is the cairo graphics library.
  30  *
  31  * The Initial Developer of the Original Code is University of Southern
  32  * California.
  33  *
  34  * Contributor(s):
  35  *      Chris Wilson <chris@chris-wilson.co.uk>
  36  */
  37
  38 #include "cairoint.h"
  39
  40 #include "cairo-compositor-private.h"
  41 #include "cairo-clip-private.h"
  42 #include "cairo-pattern-private.h"
  43 #include "cairo-surface-private.h"
  44 #include "cairo-surface-offset-private.h"
  45
  46 static cairo_int_status_t
  47 _cairo_shape_mask_compositor_stroke (const cairo_compositor_t *_compositor,
  48                                      cairo_composite_rectangles_t *extents,
  49                                      const cairo_path_fixed_t   *path,
  50                                      const cairo_stroke_style_t *style,
  51                                      const cairo_matrix_t       *ctm,
  52                                      const cairo_matrix_t       *ctm_inverse,
  53                                      double              tolerance,
  54                                      cairo_antialias_t   antialias)
  55 {
  56     cairo_surface_t *mask;
  57     cairo_surface_pattern_t pattern;
  58     cairo_int_status_t status;
  59     cairo_clip_t *clip;
  60
  61     if (! extents->is_bounded)
  62         return CAIRO_INT_STATUS_UNSUPPORTED;
  63
  64     TRACE ((stderr, "%s\n", __FUNCTION__));
  65     mask = _cairo_surface_create_similar_scratch (extents->surface,
  66                                                   CAIRO_CONTENT_ALPHA,
  67                                                   extents->bounded.width,
  68                                                   extents->bounded.height);
  69     if (unlikely (mask->status))
  70         return mask->status;
  71
  72     clip = extents->clip;
  73     if (! _cairo_clip_is_region (clip))
  74         clip = _cairo_clip_copy_region (clip);
  75
  76     if (! mask->is_clear) {
  77         status = _cairo_surface_offset_paint (mask,
  78                                               extents->bounded.x,
  79                                               extents->bounded.y,
  80                                               CAIRO_OPERATOR_CLEAR,
  81                                               &_cairo_pattern_clear.base,
  82                                               clip);
  83         if (unlikely (status))
  84             goto error;
  85     }
  86
  87     status = _cairo_surface_offset_stroke (mask,
  88                                            extents->bounded.x,
  89                                            extents->bounded.y,
  90                                            CAIRO_OPERATOR_ADD,
  91                                            &_cairo_pattern_white.base,
  92                                            path, style, ctm, ctm_inverse,
  93                                            tolerance, antialias,
  94                                            clip);
  95     if (unlikely (status))
  96         goto error;
  97
  98     if (clip != extents->clip) {
  99         status = _cairo_clip_combine_with_surface (extents->clip, mask,
 100                                                    extents->bounded.x,
 101                                                    extents->bounded.y);
 102         if (unlikely (status))
 103             goto error;
 104     }
 105
 106     _cairo_pattern_init_for_surface (&pattern, mask);
 107     cairo_matrix_init_translate (&pattern.base.matrix,
 108                                  -extents->bounded.x,
 109                                  -extents->bounded.y);
 110     pattern.base.filter = CAIRO_FILTER_NEAREST;
 111     pattern.base.extend = CAIRO_EXTEND_NONE;
 112     if (extents->op == CAIRO_OPERATOR_SOURCE) {
 113         status = _cairo_surface_mask (extents->surface,
 114                                       CAIRO_OPERATOR_DEST_OUT,
 115                                       &_cairo_pattern_white.base,
 116                                       &pattern.base,
 117                                       clip);
 118         if ((status == CAIRO_INT_STATUS_SUCCESS)) {
 119             status = _cairo_surface_mask (extents->surface,
 120                                           CAIRO_OPERATOR_ADD,
 121                                           &extents->source_pattern.base,
 122                                           &pattern.base,
 123                                           clip);
 124         }
 125     } else {
 126         status = _cairo_surface_mask (extents->surface,
 127                                       extents->op,
 128                                       &extents->source_pattern.base,
 129                                       &pattern.base,
 130                                       clip);
 131     }
 132     _cairo_pattern_fini (&pattern.base);
 133
 134 error:
 135     cairo_surface_destroy (mask);
 136     if (clip != extents->clip)
 137         _cairo_clip_destroy (clip);
 138     return status;
 139 }
 140
 141 static cairo_int_status_t
 142 _cairo_shape_mask_compositor_fill (const cairo_compositor_t *_compositor,
 143                                    cairo_composite_rectangles_t *extents,
 144                                    const cairo_path_fixed_t     *path,
 145                                    cairo_fill_rule_t     fill_rule,
 146                                    double                        tolerance,
 147                                    cairo_antialias_t     antialias)
 148 {
 149     cairo_surface_t *mask;
 150     cairo_surface_pattern_t pattern;
 151     cairo_int_status_t status;
 152     cairo_clip_t *clip;
 153
 154     TRACE ((stderr, "%s\n", __FUNCTION__));
 155
 156     if (! extents->is_bounded)
 157         return CAIRO_INT_STATUS_UNSUPPORTED;
 158
 159     mask = _cairo_surface_create_similar_scratch (extents->surface,
 160                                                   CAIRO_CONTENT_ALPHA,
 161                                                   extents->bounded.width,
 162                                                   extents->bounded.height);
 163     if (unlikely (mask->status))
 164         return mask->status;
 165
 166     clip = extents->clip;
 167     if (! _cairo_clip_is_region (clip))
 168         clip = _cairo_clip_copy_region (clip);
 169
 170     if (! mask->is_clear) {
 171         status = _cairo_surface_offset_paint (mask,
 172                                               extents->bounded.x,
 173                                               extents->bounded.y,
 174                                               CAIRO_OPERATOR_CLEAR,
 175                                               &_cairo_pattern_clear.base,
 176                                               clip);
 177         if (unlikely (status))
 178             goto error;
 179     }
 180
 181     status = _cairo_surface_offset_fill (mask,
 182                                          extents->bounded.x,
 183                                          extents->bounded.y,
 184                                          CAIRO_OPERATOR_ADD,
 185                                          &_cairo_pattern_white.base,
 186                                          path, fill_rule, tolerance, antialias,
 187                                          clip);
 188     if (unlikely (status))
 189         goto error;
 190
 191     if (clip != extents->clip) {
 192         status = _cairo_clip_combine_with_surface (extents->clip, mask,
 193                                                    extents->bounded.x,
 194                                                    extents->bounded.y);
 195         if (unlikely (status))
 196             goto error;
 197     }
 198
 199     _cairo_pattern_init_for_surface (&pattern, mask);
 200     cairo_matrix_init_translate (&pattern.base.matrix,
 201                                  -extents->bounded.x,
 202                                  -extents->bounded.y);
 203     pattern.base.filter = CAIRO_FILTER_NEAREST;
 204     pattern.base.extend = CAIRO_EXTEND_NONE;
 205     if (extents->op == CAIRO_OPERATOR_SOURCE) {
 206         status = _cairo_surface_mask (extents->surface,
 207                                       CAIRO_OPERATOR_DEST_OUT,
 208                                       &_cairo_pattern_white.base,
 209                                       &pattern.base,
 210                                       clip);
 211         if ((status == CAIRO_INT_STATUS_SUCCESS)) {
 212             status = _cairo_surface_mask (extents->surface,
 213                                           CAIRO_OPERATOR_ADD,
 214                                           &extents->source_pattern.base,
 215                                           &pattern.base,
 216                                           clip);
 217         }
 218     } else {
 219         status = _cairo_surface_mask (extents->surface,
 220                                       extents->op,
 221                                       &extents->source_pattern.base,
 222                                       &pattern.base,
 223                                       clip);
 224     }
 225     _cairo_pattern_fini (&pattern.base);
 226
 227 error:
 228     if (clip != extents->clip)
 229         _cairo_clip_destroy (clip);
 230     cairo_surface_destroy (mask);
 231     return status;
 232 }
 233
 234 static cairo_int_status_t
 235 _cairo_shape_mask_compositor_glyphs (const cairo_compositor_t *_compositor,
 236                                      cairo_composite_rectangles_t *extents,
 237                                      cairo_scaled_font_t        *scaled_font,
 238                                      cairo_glyph_t              *glyphs,
 239                                      int                         num_glyphs,
 240                                      cairo_bool_t                overlap)
 241 {
 242     cairo_surface_t *mask;
 243     cairo_surface_pattern_t pattern;
 244     cairo_int_status_t status;
 245     cairo_clip_t *clip;
 246
 247     if (! extents->is_bounded)
 248         return CAIRO_INT_STATUS_UNSUPPORTED;
 249
 250     TRACE ((stderr, "%s\n", __FUNCTION__));
 251     mask = _cairo_surface_create_similar_scratch (extents->surface,
 252                                                   CAIRO_CONTENT_ALPHA,
 253                                                   extents->bounded.width,
 254                                                   extents->bounded.height);
 255     if (unlikely (mask->status))
 256         return mask->status;
 257
 258     clip = extents->clip;
 259     if (! _cairo_clip_is_region (clip))
 260         clip = _cairo_clip_copy_region (clip);
 261
 262     if (! mask->is_clear) {
 263         status = _cairo_surface_offset_paint (mask,
 264                                               extents->bounded.x,
 265                                               extents->bounded.y,
 266                                               CAIRO_OPERATOR_CLEAR,
 267                                               &_cairo_pattern_clear.base,
 268                                               clip);
 269         if (unlikely (status))
 270             goto error;
 271     }
 272
 273     status = _cairo_surface_offset_glyphs (mask,
 274                                            extents->bounded.x,
 275                                            extents->bounded.y,
 276                                            CAIRO_OPERATOR_ADD,
 277                                            &_cairo_pattern_white.base,
 278                                            scaled_font, glyphs, num_glyphs,
 279                                            clip);
 280     if (unlikely (status))
 281         goto error;
 282
 283     if (clip != extents->clip) {
 284         status = _cairo_clip_combine_with_surface (extents->clip, mask,
 285                                                    extents->bounded.x,
 286                                                    extents->bounded.y);
 287         if (unlikely (status))
 288             goto error;
 289     }
 290
 291     _cairo_pattern_init_for_surface (&pattern, mask);
 292     cairo_matrix_init_translate (&pattern.base.matrix,
 293                                  -extents->bounded.x,
 294                                  -extents->bounded.y);
 295     pattern.base.filter = CAIRO_FILTER_NEAREST;
 296     pattern.base.extend = CAIRO_EXTEND_NONE;
 297     if (extents->op == CAIRO_OPERATOR_SOURCE) {
 298         status = _cairo_surface_mask (extents->surface,
 299                                       CAIRO_OPERATOR_DEST_OUT,
 300                                       &_cairo_pattern_white.base,
 301                                       &pattern.base,
 302                                       clip);
 303         if ((status == CAIRO_INT_STATUS_SUCCESS)) {
 304             status = _cairo_surface_mask (extents->surface,
 305                                           CAIRO_OPERATOR_ADD,
 306                                           &extents->source_pattern.base,
 307                                           &pattern.base,
 308                                           clip);
 309         }
 310     } else {
 311         status = _cairo_surface_mask (extents->surface,
 312                                       extents->op,
 313                                       &extents->source_pattern.base,
 314                                       &pattern.base,
 315                                       clip);
 316     }
 317     _cairo_pattern_fini (&pattern.base);
 318
 319 error:
 320     if (clip != extents->clip)
 321         _cairo_clip_destroy (clip);
 322     cairo_surface_destroy (mask);
 323     return status;
 324 }
 325
 326 void
 327 _cairo_shape_mask_compositor_init (cairo_compositor_t *compositor,
 328                                    const cairo_compositor_t  *delegate)
 329 {
 330     compositor->delegate = delegate;
 331
 332     compositor->paint  = NULL;
 333     compositor->mask   = NULL;
 334     compositor->fill   = _cairo_shape_mask_compositor_fill;
 335     compositor->stroke = _cairo_shape_mask_compositor_stroke;
 336     compositor->glyphs = _cairo_shape_mask_compositor_glyphs;
 337 }