pixman/pixman-noop.c

   1 /* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
   2 /*
   3  * Copyright © 2011 Red Hat, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include "pixman-private.h"
  30 #include "pixman-combine32.h"
  31 #include "pixman-inlines.h"
  32
  33 static void
  34 noop_composite (pixman_implementation_t *imp,
  35                 pixman_composite_info_t *info)
  36 {
  37     return;
  38 }
  39
  40 static void
  41 dest_write_back_direct (pixman_iter_t *iter)
  42 {
  43     iter->buffer += iter->image->bits.rowstride;
  44 }
  45
  46 static uint32_t *
  47 noop_get_scanline (pixman_iter_t *iter, const uint32_t *mask)
  48 {
  49     uint32_t *result = iter->buffer;
  50
  51     iter->buffer += iter->image->bits.rowstride;
  52
  53     return result;
  54 }
  55
  56 static uint32_t *
  57 get_scanline_null (pixman_iter_t *iter, const uint32_t *mask)
  58 {
  59     return NULL;
  60 }
  61
  62 static void
  63 noop_src_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)
  64 {
  65     pixman_image_t *image = iter->image;
  66
  67 #define FLAGS                                           \
  68     (FAST_PATH_STANDARD_FLAGS | FAST_PATH_ID_TRANSFORM)
  69
  70     if (!image)
  71     {
  72         iter->get_scanline = get_scanline_null;
  73     }
  74     else if ((iter->flags & (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB)) ==
  75              (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB))
  76     {
  77         iter->get_scanline = _pixman_iter_get_scanline_noop;
  78     }
  79     else if (image->common.extended_format_code == PIXMAN_a8r8g8b8      &&
  80              (iter->flags & ITER_NARROW)                                &&
  81              (image->common.flags & FLAGS) == FLAGS                     &&
  82              iter->x >= 0 && iter->y >= 0                               &&
  83              iter->x + iter->width <= image->bits.width                 &&
  84              iter->y + iter->height <= image->bits.height)
  85     {
  86         iter->buffer =
  87             image->bits.bits + iter->y * image->bits.rowstride + iter->x;
  88
  89         iter->get_scanline = noop_get_scanline;
  90     }
  91     else
  92     {
  93         (* imp->delegate->src_iter_init) (imp->delegate, iter);
  94     }
  95 }
  96
  97 static void
  98 noop_dest_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)
  99 {
 100     pixman_image_t *image = iter->image;
 101     uint32_t image_flags = image->common.flags;
 102     uint32_t iter_flags = iter->flags;
 103
 104     if ((image_flags & FAST_PATH_STD_DEST_FLAGS) == FAST_PATH_STD_DEST_FLAGS    &&
 105         (iter_flags & ITER_NARROW) == ITER_NARROW                               &&
 106         ((image->common.extended_format_code == PIXMAN_a8r8g8b8)        ||
 107          (image->common.extended_format_code == PIXMAN_x8r8g8b8 &&
 108           (iter_flags & (ITER_LOCALIZED_ALPHA)))))
 109     {
 110         iter->buffer = image->bits.bits + iter->y * image->bits.rowstride + iter->x;
 111
 112         iter->get_scanline = _pixman_iter_get_scanline_noop;
 113         iter->write_back = dest_write_back_direct;
 114     }
 115     else
 116     {
 117         (* imp->delegate->dest_iter_init) (imp->delegate, iter);
 118     }
 119 }
 120
 121 static const pixman_fast_path_t noop_fast_paths[] =
 122 {
 123     { PIXMAN_OP_DST, PIXMAN_any, 0, PIXMAN_any, 0, PIXMAN_any, 0, noop_composite },
 124     { PIXMAN_OP_NONE },
 125 };
 126
 127 pixman_implementation_t *
 128 _pixman_implementation_create_noop (pixman_implementation_t *fallback)
 129 {
 130     pixman_implementation_t *imp =
 131         _pixman_implementation_create (fallback, noop_fast_paths);
 132
 133     imp->src_iter_init = noop_src_iter_init;
 134     imp->dest_iter_init = noop_dest_iter_init;
 135
 136     return imp;
 137 }