pixman-general.c revision de17ff4a 
1/*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2000 SuSE, Inc.
4 * Copyright © 2007 Red Hat, Inc.
5 * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
6 *             2005 Lars Knoll & Zack Rusin, Trolltech
7 *             2008 Aaron Plattner, NVIDIA Corporation
8 *
9 * Permission to use, copy, modify, distribute, and sell this software and its
10 * documentation for any purpose is hereby granted without fee, provided that
11 * the above copyright notice appear in all copies and that both that
12 * copyright notice and this permission notice appear in supporting
13 * documentation, and that the name of Red Hat not be used in advertising or
14 * publicity pertaining to distribution of the software without specific,
15 * written prior permission.  Red Hat makes no representations about the
16 * suitability of this software for any purpose.  It is provided "as is"
17 * without express or implied warranty.
18 *
19 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
20 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
22 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
23 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
24 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
25 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
26 * SOFTWARE.
27 */
28#ifdef HAVE_CONFIG_H
29#include <config.h>
30#endif
31#include <stdlib.h>
32#include <string.h>
33#include <math.h>
34#include <limits.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include "pixman-private.h"
39
40static void
41general_iter_init (pixman_iter_t *iter, const pixman_iter_info_t *info)
42{
43    pixman_image_t *image = iter->image;
44
45    switch (image->type)
46    {
47    case BITS:
48        if ((iter->iter_flags & ITER_SRC) == ITER_SRC)
49            _pixman_bits_image_src_iter_init (image, iter);
50        else
51            _pixman_bits_image_dest_iter_init (image, iter);
52        break;
53
54    case LINEAR:
55        _pixman_linear_gradient_iter_init (image, iter);
56        break;
57
58    case RADIAL:
59	_pixman_radial_gradient_iter_init (image, iter);
60        break;
61
62    case CONICAL:
63	_pixman_conical_gradient_iter_init (image, iter);
64        break;
65
66    case SOLID:
67        _pixman_log_error (FUNC, "Solid image not handled by noop");
68        break;
69
70    default:
71	_pixman_log_error (FUNC, "Pixman bug: unknown image type\n");
72        break;
73    }
74}
75
76static const pixman_iter_info_t general_iters[] =
77{
78    { PIXMAN_any, 0, 0, general_iter_init, NULL, NULL },
79    { PIXMAN_null },
80};
81
82typedef struct op_info_t op_info_t;
83struct op_info_t
84{
85    uint8_t src, dst;
86};
87
88#define ITER_IGNORE_BOTH						\
89    (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB | ITER_LOCALIZED_ALPHA)
90
91static const op_info_t op_flags[PIXMAN_N_OPERATORS] =
92{
93    /* Src                   Dst                   */
94    { ITER_IGNORE_BOTH,      ITER_IGNORE_BOTH      }, /* CLEAR */
95    { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_BOTH      }, /* SRC */
96    { ITER_IGNORE_BOTH,      ITER_LOCALIZED_ALPHA  }, /* DST */
97    { 0,                     ITER_LOCALIZED_ALPHA  }, /* OVER */
98    { ITER_LOCALIZED_ALPHA,  0                     }, /* OVER_REVERSE */
99    { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* IN */
100    { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* IN_REVERSE */
101    { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* OUT */
102    { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* OUT_REVERSE */
103    { 0,                     0                     }, /* ATOP */
104    { 0,                     0                     }, /* ATOP_REVERSE */
105    { 0,                     0                     }, /* XOR */
106    { ITER_LOCALIZED_ALPHA,  ITER_LOCALIZED_ALPHA  }, /* ADD */
107    { 0,                     0                     }, /* SATURATE */
108};
109
110#define SCANLINE_BUFFER_LENGTH 8192
111
112static void
113general_composite_rect  (pixman_implementation_t *imp,
114                         pixman_composite_info_t *info)
115{
116    PIXMAN_COMPOSITE_ARGS (info);
117    uint8_t stack_scanline_buffer[3 * SCANLINE_BUFFER_LENGTH];
118    uint8_t *scanline_buffer = (uint8_t *) stack_scanline_buffer;
119    uint8_t *src_buffer, *mask_buffer, *dest_buffer;
120    pixman_iter_t src_iter, mask_iter, dest_iter;
121    pixman_combine_32_func_t compose;
122    pixman_bool_t component_alpha;
123    iter_flags_t width_flag, src_iter_flags;
124    int Bpp;
125    int i;
126
127    if ((src_image->common.flags & FAST_PATH_NARROW_FORMAT)		    &&
128	(!mask_image || mask_image->common.flags & FAST_PATH_NARROW_FORMAT) &&
129	(dest_image->common.flags & FAST_PATH_NARROW_FORMAT))
130    {
131	width_flag = ITER_NARROW;
132	Bpp = 4;
133    }
134    else
135    {
136	width_flag = ITER_WIDE;
137	Bpp = 16;
138    }
139
140#define ALIGN(addr)							\
141    ((uint8_t *)((((uintptr_t)(addr)) + 15) & (~15)))
142
143    src_buffer = ALIGN (scanline_buffer);
144    mask_buffer = ALIGN (src_buffer + width * Bpp);
145    dest_buffer = ALIGN (mask_buffer + width * Bpp);
146
147    if (ALIGN (dest_buffer + width * Bpp) >
148	    scanline_buffer + sizeof (stack_scanline_buffer))
149    {
150	scanline_buffer = pixman_malloc_ab_plus_c (width, Bpp * 3, 32 * 3);
151
152	if (!scanline_buffer)
153	    return;
154
155	src_buffer = ALIGN (scanline_buffer);
156	mask_buffer = ALIGN (src_buffer + width * Bpp);
157	dest_buffer = ALIGN (mask_buffer + width * Bpp);
158    }
159
160    if (width_flag == ITER_WIDE)
161    {
162	/* To make sure there aren't any NANs in the buffers */
163	memset (src_buffer, 0, width * Bpp);
164	memset (mask_buffer, 0, width * Bpp);
165	memset (dest_buffer, 0, width * Bpp);
166    }
167
168    /* src iter */
169    src_iter_flags = width_flag | op_flags[op].src | ITER_SRC;
170
171    _pixman_implementation_iter_init (imp->toplevel, &src_iter, src_image,
172                                      src_x, src_y, width, height,
173                                      src_buffer, src_iter_flags,
174                                      info->src_flags);
175
176    /* mask iter */
177    if ((src_iter_flags & (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB)) ==
178	(ITER_IGNORE_ALPHA | ITER_IGNORE_RGB))
179    {
180	/* If it doesn't matter what the source is, then it doesn't matter
181	 * what the mask is
182	 */
183	mask_image = NULL;
184    }
185
186    component_alpha =
187        mask_image			      &&
188        mask_image->common.type == BITS       &&
189        mask_image->common.component_alpha    &&
190        PIXMAN_FORMAT_RGB (mask_image->bits.format);
191
192    _pixman_implementation_iter_init (
193	imp->toplevel, &mask_iter,
194	mask_image, mask_x, mask_y, width, height, mask_buffer,
195	ITER_SRC | width_flag | (component_alpha? 0 : ITER_IGNORE_RGB),
196	info->mask_flags);
197
198    /* dest iter */
199    _pixman_implementation_iter_init (
200	imp->toplevel, &dest_iter, dest_image, dest_x, dest_y, width, height,
201	dest_buffer, ITER_DEST | width_flag | op_flags[op].dst, info->dest_flags);
202
203    compose = _pixman_implementation_lookup_combiner (
204	imp->toplevel, op, component_alpha, width_flag != ITER_WIDE);
205
206    for (i = 0; i < height; ++i)
207    {
208	uint32_t *s, *m, *d;
209
210	m = mask_iter.get_scanline (&mask_iter, NULL);
211	s = src_iter.get_scanline (&src_iter, m);
212	d = dest_iter.get_scanline (&dest_iter, NULL);
213
214	compose (imp->toplevel, op, d, s, m, width);
215
216	dest_iter.write_back (&dest_iter);
217    }
218
219    if (src_iter.fini)
220	src_iter.fini (&src_iter);
221    if (mask_iter.fini)
222	mask_iter.fini (&mask_iter);
223    if (dest_iter.fini)
224	dest_iter.fini (&dest_iter);
225
226    if (scanline_buffer != (uint8_t *) stack_scanline_buffer)
227	free (scanline_buffer);
228}
229
230static const pixman_fast_path_t general_fast_path[] =
231{
232    { PIXMAN_OP_any, PIXMAN_any, 0, PIXMAN_any,	0, PIXMAN_any, 0, general_composite_rect },
233    { PIXMAN_OP_NONE }
234};
235
236pixman_implementation_t *
237_pixman_implementation_create_general (void)
238{
239    pixman_implementation_t *imp = _pixman_implementation_create (NULL, general_fast_path);
240
241    _pixman_setup_combiner_functions_32 (imp);
242    _pixman_setup_combiner_functions_float (imp);
243
244    imp->iter_info = general_iters;
245
246    return imp;
247}
248
249