src/cairo-surface-offset.c

   1 /* cairo - a vector graphics library with display and print output
   2  *
   3  * Copyright © 2005 Red Hat, Inc
   4  * Copyright © 2007 Adrian Johnson
   5  * Copyright © 2009 Chris Wilson
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it either under the terms of the GNU Lesser General Public
   9  * License version 2.1 as published by the Free Software Foundation
  10  * (the "LGPL") or, at your option, under the terms of the Mozilla
  11  * Public License Version 1.1 (the "MPL"). If you do not alter this
  12  * notice, a recipient may use your version of this file under either
  13  * the MPL or the LGPL.
  14  *
  15  * You should have received a copy of the LGPL along with this library
  16  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  18  * You should have received a copy of the MPL along with this library
  19  * in the file COPYING-MPL-1.1
  20  *
  21  * The contents of this file are subject to the Mozilla Public License
  22  * Version 1.1 (the "License"); you may not use this file except in
  23  * compliance with the License. You may obtain a copy of the License at
  24  * http://www.mozilla.org/MPL/
  25  *
  26  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  27  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  28  * the specific language governing rights and limitations.
  29  *
  30  * The Original Code is the cairo graphics library.
  31  *
  32  * The Initial Developer of the Original Code is Red Hat, Inc.
  33  *
  34  * Contributor(s):
  35  *      Chris Wilson <chris@chris-wilson.co.uk>
  36  */
  37
  38 #include "cairoint.h"
  39
  40 #include "cairo-clip-inline.h"
  41 #include "cairo-error-private.h"
  42 #include "cairo-pattern-private.h"
  43 #include "cairo-surface-offset-private.h"
  44
  45 /* A collection of routines to facilitate drawing to an alternate surface. */
  46
  47 static void
  48 _copy_transformed_pattern (cairo_pattern_t *pattern,
  49                            const cairo_pattern_t *original,
  50                            const cairo_matrix_t  *ctm_inverse)
  51 {
  52     _cairo_pattern_init_static_copy (pattern, original);
  53
  54     if (! _cairo_matrix_is_identity (ctm_inverse))
  55         _cairo_pattern_transform (pattern, ctm_inverse);
  56 }
  57
  58 cairo_status_t
  59 _cairo_surface_offset_paint (cairo_surface_t            *target,
  60                              int x, int y,
  61                              cairo_operator_t            op,
  62                              const cairo_pattern_t      *source,
  63                              const cairo_clip_t         *clip)
  64 {
  65     cairo_status_t status;
  66     cairo_clip_t *dev_clip = (cairo_clip_t *) clip;
  67     cairo_pattern_union_t source_copy;
  68
  69     if (unlikely (target->status))
  70         return target->status;
  71
  72     if (_cairo_clip_is_all_clipped (clip))
  73         return CAIRO_STATUS_SUCCESS;
  74
  75     if (x | y) {
  76         cairo_matrix_t m;
  77
  78         dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);
  79
  80         cairo_matrix_init_translate (&m, x, y);
  81         _copy_transformed_pattern (&source_copy.base, source, &m);
  82         source = &source_copy.base;
  83     }
  84
  85     status = _cairo_surface_paint (target, op, source, dev_clip);
  86
  87     if (dev_clip != clip)
  88         _cairo_clip_destroy (dev_clip);
  89
  90     return status;
  91 }
  92
  93 cairo_status_t
  94 _cairo_surface_offset_mask (cairo_surface_t             *target,
  95                             int x, int y,
  96                             cairo_operator_t             op,
  97                             const cairo_pattern_t       *source,
  98                             const cairo_pattern_t       *mask,
  99                             const cairo_clip_t          *clip)
 100 {
 101     cairo_status_t status;
 102     cairo_clip_t *dev_clip = (cairo_clip_t *) clip;
 103     cairo_pattern_union_t source_copy;
 104     cairo_pattern_union_t mask_copy;
 105
 106     if (unlikely (target->status))
 107         return target->status;
 108
 109     if (_cairo_clip_is_all_clipped (clip))
 110         return CAIRO_STATUS_SUCCESS;
 111
 112     if (x | y) {
 113         cairo_matrix_t m;
 114
 115         dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);
 116
 117         cairo_matrix_init_translate (&m, x, y);
 118         _copy_transformed_pattern (&source_copy.base, source, &m);
 119         _copy_transformed_pattern (&mask_copy.base, mask, &m);
 120         source = &source_copy.base;
 121         mask = &mask_copy.base;
 122     }
 123
 124     status = _cairo_surface_mask (target, op,
 125                                   source, mask,
 126                                   dev_clip);
 127
 128     if (dev_clip != clip)
 129         _cairo_clip_destroy (dev_clip);
 130
 131     return status;
 132 }
 133
 134 cairo_status_t
 135 _cairo_surface_offset_stroke (cairo_surface_t           *surface,
 136                               int x, int y,
 137                               cairo_operator_t           op,
 138                               const cairo_pattern_t     *source,
 139                               const cairo_path_fixed_t  *path,
 140                               const cairo_stroke_style_t*stroke_style,
 141                               const cairo_matrix_t      *ctm,
 142                               const cairo_matrix_t      *ctm_inverse,
 143                               double                     tolerance,
 144                               cairo_antialias_t          antialias,
 145                               const cairo_clip_t                *clip)
 146 {
 147     cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;
 148     cairo_clip_t *dev_clip = (cairo_clip_t *) clip;
 149     cairo_matrix_t dev_ctm = *ctm;
 150     cairo_matrix_t dev_ctm_inverse = *ctm_inverse;
 151     cairo_pattern_union_t source_copy;
 152     cairo_status_t status;
 153
 154     if (unlikely (surface->status))
 155         return surface->status;
 156
 157     if (_cairo_clip_is_all_clipped (clip))
 158         return CAIRO_STATUS_SUCCESS;
 159
 160     if (x | y) {
 161         cairo_matrix_t m;
 162
 163         dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);
 164
 165         status = _cairo_path_fixed_init_copy (&path_copy, dev_path);
 166         if (unlikely (status))
 167             goto FINISH;
 168
 169         _cairo_path_fixed_translate (&path_copy,
 170                                      _cairo_fixed_from_int (-x),
 171                                      _cairo_fixed_from_int (-y));
 172         dev_path = &path_copy;
 173
 174         cairo_matrix_init_translate (&m, -x, -y);
 175         cairo_matrix_multiply (&dev_ctm, &dev_ctm, &m);
 176
 177         cairo_matrix_init_translate (&m, x, y);
 178         _copy_transformed_pattern (&source_copy.base, source, &m);
 179         source = &source_copy.base;
 180         cairo_matrix_multiply (&dev_ctm_inverse, &m, &dev_ctm_inverse);
 181     }
 182
 183     status = _cairo_surface_stroke (surface, op, source,
 184                                     dev_path, stroke_style,
 185                                     &dev_ctm, &dev_ctm_inverse,
 186                                     tolerance, antialias,
 187                                     dev_clip);
 188
 189 FINISH:
 190     if (dev_path != path)
 191         _cairo_path_fixed_fini (dev_path);
 192     if (dev_clip != clip)
 193         _cairo_clip_destroy (dev_clip);
 194
 195     return status;
 196 }
 197
 198 cairo_status_t
 199 _cairo_surface_offset_fill (cairo_surface_t     *surface,
 200                             int x, int y,
 201                             cairo_operator_t     op,
 202                             const cairo_pattern_t*source,
 203                             const cairo_path_fixed_t    *path,
 204                             cairo_fill_rule_t    fill_rule,
 205                             double               tolerance,
 206                             cairo_antialias_t    antialias,
 207                             const cairo_clip_t  *clip)
 208 {
 209     cairo_status_t status;
 210     cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;
 211     cairo_clip_t *dev_clip = (cairo_clip_t *) clip;
 212     cairo_pattern_union_t source_copy;
 213
 214     if (unlikely (surface->status))
 215         return surface->status;
 216
 217     if (_cairo_clip_is_all_clipped (clip))
 218         return CAIRO_STATUS_SUCCESS;
 219
 220     if (x | y) {
 221         cairo_matrix_t m;
 222
 223         dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);
 224
 225         status = _cairo_path_fixed_init_copy (&path_copy, dev_path);
 226         if (unlikely (status))
 227             goto FINISH;
 228
 229         _cairo_path_fixed_translate (&path_copy,
 230                                      _cairo_fixed_from_int (-x),
 231                                      _cairo_fixed_from_int (-y));
 232         dev_path = &path_copy;
 233
 234         cairo_matrix_init_translate (&m, x, y);
 235         _copy_transformed_pattern (&source_copy.base, source, &m);
 236         source = &source_copy.base;
 237     }
 238
 239     status = _cairo_surface_fill (surface, op, source,
 240                                   dev_path, fill_rule,
 241                                   tolerance, antialias,
 242                                   dev_clip);
 243
 244 FINISH:
 245     if (dev_path != path)
 246         _cairo_path_fixed_fini (dev_path);
 247     if (dev_clip != clip)
 248         _cairo_clip_destroy (dev_clip);
 249
 250     return status;
 251 }
 252
 253 cairo_status_t
 254 _cairo_surface_offset_glyphs (cairo_surface_t           *surface,
 255                               int x, int y,
 256                               cairo_operator_t           op,
 257                               const cairo_pattern_t     *source,
 258                               cairo_scaled_font_t       *scaled_font,
 259                               cairo_glyph_t             *glyphs,
 260                               int                        num_glyphs,
 261                               const cairo_clip_t        *clip)
 262 {
 263     cairo_status_t status;
 264     cairo_clip_t *dev_clip = (cairo_clip_t *) clip;
 265     cairo_pattern_union_t source_copy;
 266     cairo_glyph_t *dev_glyphs;
 267     int i;
 268
 269     if (unlikely (surface->status))
 270         return surface->status;
 271
 272     if (_cairo_clip_is_all_clipped (clip))
 273         return CAIRO_STATUS_SUCCESS;
 274
 275     dev_glyphs = _cairo_malloc_ab (num_glyphs, sizeof (cairo_glyph_t));
 276     if (dev_glyphs == NULL)
 277         return _cairo_error (CAIRO_STATUS_NO_MEMORY);
 278
 279     memcpy (dev_glyphs, glyphs, sizeof (cairo_glyph_t) * num_glyphs);
 280
 281     if (x | y) {
 282         cairo_matrix_t m;
 283
 284         dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);
 285
 286         cairo_matrix_init_translate (&m, x, y);
 287         _copy_transformed_pattern (&source_copy.base, source, &m);
 288         source = &source_copy.base;
 289
 290         for (i = 0; i < num_glyphs; i++) {
 291             dev_glyphs[i].x -= x;
 292             dev_glyphs[i].y -= y;
 293         }
 294     }
 295
 296     status = _cairo_surface_show_text_glyphs (surface, op, source,
 297                                               NULL, 0,
 298                                               dev_glyphs, num_glyphs,
 299                                               NULL, 0, 0,
 300                                               scaled_font,
 301                                               dev_clip);
 302
 303     if (dev_clip != clip)
 304         _cairo_clip_destroy (dev_clip);
 305     free (dev_glyphs);
 306
 307     return status;
 308 }