src/cairo-image-spans-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 © 2003 University of Southern California
   5  * Copyright © 2009,2010,2011 Intel Corporation
   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 University of Southern
  33  * California.
  34  *
  35  * Contributor(s):
  36  *      Carl D. Worth <cworth@cworth.org>
  37  *      Chris Wilson <chris@chris-wilson.co.uk>
  38  */
  39
  40 #include "cairoint.h"
  41
  42 #include "cairo-compositor-private.h"
  43 #include "cairo-image-surface-private.h"
  44 #include "cairo-spans-compositor-private.h"
  45
  46 typedef struct _cairo_image_span_renderer {
  47     cairo_span_renderer_t base;
  48
  49     pixman_image_compositor_t *compositor;
  50     pixman_image_t *src;
  51     float opacity;
  52     cairo_rectangle_int_t extents;
  53 } cairo_image_span_renderer_t;
  54
  55 static cairo_status_t
  56 _cairo_image_span_renderer_init (cairo_abstract_span_renderer_t *_r,
  57                                  cairo_surface_t *dst,
  58                                  cairo_operator_t op,
  59                                  cairo_surface_t *src,
  60                                  int src_x, int src_y;
  61                                  float opacity,
  62                                  const cairo_composite_rectangles_t *composite,
  63                                  cairo_bool_t needs_clip)
  64 {
  65     cairo_image_span_renderer_t *r = (cairo_image_span_renderer_t *)_r;
  66     cairo_pixman_source_t *src = (cairo_pixman_source_t *)_src;
  67     int src_x, src_y;
  68
  69     if (op == CAIRO_OPERATOR_CLEAR) {
  70         op = CAIRO_OPERATOR_DEST_OUT;
  71         pattern = NULL;
  72     }
  73
  74     r->src = ((cairo_pixman_source_t *) src)->pixman_image;
  75     r->opacity = opacity;
  76
  77     if (composite->is_bounded) {
  78         if (opacity == 1.)
  79             r->base.render_rows = _cairo_image_bounded_opaque_spans;
  80         else
  81             r->base.render_rows = _cairo_image_bounded_spans;
  82         r->base.finish = NULL;
  83     } else {
  84         if (needs_clip)
  85             r->base.render_rows = _cairo_image_clipped_spans;
  86         else
  87             r->base.render_rows = _cairo_image_unbounded_spans;
  88         r->base.finish =      _cairo_image_finish_unbounded_spans;
  89         r->extents = composite->unbounded;
  90         r->extents.height += r->extents.y;
  91
  92     }
  93     r->compositor =
  94         pixman_image_create_compositor (_pixman_operator (op),
  95                                         r->src, NULL, dst->pixman_image,
  96                                         composite->bounded.x + src_x,
  97                                         composite->bounded.y + src_y,
  98                                         0, 0,
  99                                         composite->bounded.x,
 100                                         composite->bounded.y,
 101                                         composite->bounded.width,
 102                                         composite->bounded.height);
 103     if (unlikely (r->compositor == NULL))
 104         return CAIRO_INT_STATUS_NOTHING_TO_DO;
 105
 106     return CAIRO_STATUS_SUCCESS;
 107 }
 108
 109 static void
 110 _cairo_image_span_renderer_fini (cairo_abstract_span_renderer_t *_r)
 111 {
 112     cairo_image_span_renderer_t *r = (cairo_image_span_renderer_t *) r;
 113     pixman_image_compositor_destroy (r->compositor);
 114 }
 115
 116 const cairo_compositor_t *
 117 _cairo_image_spans_compositor_get (void)
 118 {
 119     static cairo_spans_compositor_t compositor;
 120
 121     if (compositor.base.delegate == NULL) {
 122         /* Can't fallback to the mask compositor as that will simply
 123          * call the spans-compositor again to render the mask!
 124          */
 125         _cairo_spans_compositor_init (&compositor,
 126                                       _cairo_image_traps_compositor_get());
 127
 128     }
 129
 130     return &compositor.base;
 131 }