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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 
40 static pixman_bool_t
general_src_iter_init(pixman_implementation_t * imp,pixman_iter_t * iter)41 general_src_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)
42 {
43     pixman_image_t *image = iter->image;
44 
45     if (image->type == LINEAR)
46 	_pixman_linear_gradient_iter_init (image, iter);
47     else if (image->type == RADIAL)
48 	_pixman_radial_gradient_iter_init (image, iter);
49     else if (image->type == CONICAL)
50 	_pixman_conical_gradient_iter_init (image, iter);
51     else if (image->type == BITS)
52 	_pixman_bits_image_src_iter_init (image, iter);
53     else if (image->type == SOLID)
54         _pixman_log_error (FUNC, "Solid image not handled by noop");
55     else
56 	_pixman_log_error (FUNC, "Pixman bug: unknown image type\n");
57 
58     return TRUE;
59 }
60 
61 static pixman_bool_t
general_dest_iter_init(pixman_implementation_t * imp,pixman_iter_t * iter)62 general_dest_iter_init (pixman_implementation_t *imp, pixman_iter_t *iter)
63 {
64     if (iter->image->type == BITS)
65     {
66 	_pixman_bits_image_dest_iter_init (iter->image, iter);
67 
68 	return TRUE;
69     }
70     else
71     {
72 	_pixman_log_error (FUNC, "Trying to write to a non-writable image");
73 
74 	return FALSE;
75     }
76 }
77 
78 typedef struct op_info_t op_info_t;
79 struct op_info_t
80 {
81     uint8_t src, dst;
82 };
83 
84 #define ITER_IGNORE_BOTH						\
85     (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB | ITER_LOCALIZED_ALPHA)
86 
87 static const op_info_t op_flags[PIXMAN_N_OPERATORS] =
88 {
89     /* Src                   Dst                   */
90     { ITER_IGNORE_BOTH,      ITER_IGNORE_BOTH      }, /* CLEAR */
91     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_BOTH      }, /* SRC */
92     { ITER_IGNORE_BOTH,      ITER_LOCALIZED_ALPHA  }, /* DST */
93     { 0,                     ITER_LOCALIZED_ALPHA  }, /* OVER */
94     { ITER_LOCALIZED_ALPHA,  0                     }, /* OVER_REVERSE */
95     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* IN */
96     { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* IN_REVERSE */
97     { ITER_LOCALIZED_ALPHA,  ITER_IGNORE_RGB       }, /* OUT */
98     { ITER_IGNORE_RGB,       ITER_LOCALIZED_ALPHA  }, /* OUT_REVERSE */
99     { 0,                     0                     }, /* ATOP */
100     { 0,                     0                     }, /* ATOP_REVERSE */
101     { 0,                     0                     }, /* XOR */
102     { ITER_LOCALIZED_ALPHA,  ITER_LOCALIZED_ALPHA  }, /* ADD */
103     { 0,                     0                     }, /* SATURATE */
104 };
105 
106 #define SCANLINE_BUFFER_LENGTH 8192
107 
108 static void
general_composite_rect(pixman_implementation_t * imp,pixman_composite_info_t * info)109 general_composite_rect  (pixman_implementation_t *imp,
110                          pixman_composite_info_t *info)
111 {
112     PIXMAN_COMPOSITE_ARGS (info);
113     uint64_t stack_scanline_buffer[(SCANLINE_BUFFER_LENGTH * 3 + 7) / 8];
114     uint8_t *scanline_buffer = (uint8_t *) stack_scanline_buffer;
115     uint8_t *src_buffer, *mask_buffer, *dest_buffer;
116     pixman_iter_t src_iter, mask_iter, dest_iter;
117     pixman_combine_32_func_t compose;
118     pixman_bool_t component_alpha;
119     iter_flags_t narrow, src_iter_flags;
120     int Bpp;
121     int i;
122 
123     if ((src_image->common.flags & FAST_PATH_NARROW_FORMAT)		    &&
124 	(!mask_image || mask_image->common.flags & FAST_PATH_NARROW_FORMAT) &&
125 	(dest_image->common.flags & FAST_PATH_NARROW_FORMAT))
126     {
127 	narrow = ITER_NARROW;
128 	Bpp = 4;
129     }
130     else
131     {
132 	narrow = 0;
133 	Bpp = 16;
134     }
135 
136     if (width * Bpp > SCANLINE_BUFFER_LENGTH)
137     {
138 	scanline_buffer = pixman_malloc_abc (width, 3, Bpp);
139 
140 	if (!scanline_buffer)
141 	    return;
142     }
143 
144     src_buffer = scanline_buffer;
145     mask_buffer = src_buffer + width * Bpp;
146     dest_buffer = mask_buffer + width * Bpp;
147 
148     if (!narrow)
149     {
150 	/* To make sure there aren't any NANs in the buffers */
151 	memset (src_buffer, 0, width * Bpp);
152 	memset (mask_buffer, 0, width * Bpp);
153 	memset (dest_buffer, 0, width * Bpp);
154     }
155 
156     /* src iter */
157     src_iter_flags = narrow | op_flags[op].src;
158 
159     _pixman_implementation_src_iter_init (imp->toplevel, &src_iter, src_image,
160 					  src_x, src_y, width, height,
161 					  src_buffer, src_iter_flags, info->src_flags);
162 
163     /* mask iter */
164     if ((src_iter_flags & (ITER_IGNORE_ALPHA | ITER_IGNORE_RGB)) ==
165 	(ITER_IGNORE_ALPHA | ITER_IGNORE_RGB))
166     {
167 	/* If it doesn't matter what the source is, then it doesn't matter
168 	 * what the mask is
169 	 */
170 	mask_image = NULL;
171     }
172 
173     component_alpha =
174         mask_image			      &&
175         mask_image->common.type == BITS       &&
176         mask_image->common.component_alpha    &&
177         PIXMAN_FORMAT_RGB (mask_image->bits.format);
178 
179     _pixman_implementation_src_iter_init (
180 	imp->toplevel, &mask_iter, mask_image, mask_x, mask_y, width, height,
181 	mask_buffer, narrow | (component_alpha? 0 : ITER_IGNORE_RGB), info->mask_flags);
182 
183     /* dest iter */
184     _pixman_implementation_dest_iter_init (
185 	imp->toplevel, &dest_iter, dest_image, dest_x, dest_y, width, height,
186 	dest_buffer, narrow | op_flags[op].dst, info->dest_flags);
187 
188     compose = _pixman_implementation_lookup_combiner (
189 	imp->toplevel, op, component_alpha, narrow);
190 
191     for (i = 0; i < height; ++i)
192     {
193 	uint32_t *s, *m, *d;
194 
195 	m = mask_iter.get_scanline (&mask_iter, NULL);
196 	s = src_iter.get_scanline (&src_iter, m);
197 	d = dest_iter.get_scanline (&dest_iter, NULL);
198 
199 	compose (imp->toplevel, op, d, s, m, width);
200 
201 	dest_iter.write_back (&dest_iter);
202     }
203 
204     if (scanline_buffer != (uint8_t *) stack_scanline_buffer)
205 	free (scanline_buffer);
206 }
207 
208 static const pixman_fast_path_t general_fast_path[] =
209 {
210     { PIXMAN_OP_any, PIXMAN_any, 0, PIXMAN_any,	0, PIXMAN_any, 0, general_composite_rect },
211     { PIXMAN_OP_NONE }
212 };
213 
214 pixman_implementation_t *
_pixman_implementation_create_general(void)215 _pixman_implementation_create_general (void)
216 {
217     pixman_implementation_t *imp = _pixman_implementation_create (NULL, general_fast_path);
218 
219     _pixman_setup_combiner_functions_32 (imp);
220     _pixman_setup_combiner_functions_float (imp);
221 
222     imp->src_iter_init = general_src_iter_init;
223     imp->dest_iter_init = general_dest_iter_init;
224 
225     return imp;
226 }
227 
228