1 /*
2 * Copyright © 2000 SuSE, Inc.
3 * Copyright © 1999 Keith Packard
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and its
6 * documentation for any purpose is hereby granted without fee, provided that
7 * the above copyright notice appear in all copies and that both that
8 * copyright notice and this permission notice appear in supporting
9 * documentation, and that the name of SuSE not be used in advertising or
10 * publicity pertaining to distribution of the software without specific,
11 * written prior permission. SuSE makes no representations about the
12 * suitability of this software for any purpose. It is provided "as is"
13 * without express or implied warranty.
14 *
15 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 *
22 * Author: Keith Packard, SuSE, Inc.
23 */
24
25 #ifdef HAVE_CONFIG_H
26 #include <config.h>
27 #endif
28 #include <stdio.h>
29 #include <stdlib.h>
30
31 #include "pixman-private.h"
32
33 pixman_bool_t
_pixman_multiply_overflows_size(size_t a,size_t b)34 _pixman_multiply_overflows_size (size_t a, size_t b)
35 {
36 return a >= SIZE_MAX / b;
37 }
38
39 pixman_bool_t
_pixman_multiply_overflows_int(unsigned int a,unsigned int b)40 _pixman_multiply_overflows_int (unsigned int a, unsigned int b)
41 {
42 return a >= INT32_MAX / b;
43 }
44
45 pixman_bool_t
_pixman_addition_overflows_int(unsigned int a,unsigned int b)46 _pixman_addition_overflows_int (unsigned int a, unsigned int b)
47 {
48 return a > INT32_MAX - b;
49 }
50
51 void *
pixman_malloc_ab(unsigned int a,unsigned int b)52 pixman_malloc_ab (unsigned int a,
53 unsigned int b)
54 {
55 if (a >= INT32_MAX / b)
56 return NULL;
57
58 return malloc (a * b);
59 }
60
61 void *
pixman_malloc_abc(unsigned int a,unsigned int b,unsigned int c)62 pixman_malloc_abc (unsigned int a,
63 unsigned int b,
64 unsigned int c)
65 {
66 if (a >= INT32_MAX / b)
67 return NULL;
68 else if (a * b >= INT32_MAX / c)
69 return NULL;
70 else
71 return malloc (a * b * c);
72 }
73
74 static force_inline uint16_t
float_to_unorm(float f,int n_bits)75 float_to_unorm (float f, int n_bits)
76 {
77 uint32_t u;
78
79 if (f > 1.0)
80 f = 1.0;
81 if (f < 0.0)
82 f = 0.0;
83
84 u = f * (1 << n_bits);
85 u -= (u >> n_bits);
86
87 return u;
88 }
89
90 static force_inline float
unorm_to_float(uint16_t u,int n_bits)91 unorm_to_float (uint16_t u, int n_bits)
92 {
93 uint32_t m = ((1 << n_bits) - 1);
94
95 return (u & m) * (1.f / (float)m);
96 }
97
98 /*
99 * This function expands images from a8r8g8b8 to argb_t. To preserve
100 * precision, it needs to know from which source format the a8r8g8b8 pixels
101 * originally came.
102 *
103 * For example, if the source was PIXMAN_x1r5g5b5 and the red component
104 * contained bits 12345, then the 8-bit value is 12345123. To correctly
105 * expand this to floating point, it should be 12345 / 31.0 and not
106 * 12345123 / 255.0.
107 */
108 void
pixman_expand_to_float(argb_t * dst,const uint32_t * src,pixman_format_code_t format,int width)109 pixman_expand_to_float (argb_t *dst,
110 const uint32_t *src,
111 pixman_format_code_t format,
112 int width)
113 {
114 static const float multipliers[16] = {
115 0.0f,
116 1.0f / ((1 << 1) - 1),
117 1.0f / ((1 << 2) - 1),
118 1.0f / ((1 << 3) - 1),
119 1.0f / ((1 << 4) - 1),
120 1.0f / ((1 << 5) - 1),
121 1.0f / ((1 << 6) - 1),
122 1.0f / ((1 << 7) - 1),
123 1.0f / ((1 << 8) - 1),
124 1.0f / ((1 << 9) - 1),
125 1.0f / ((1 << 10) - 1),
126 1.0f / ((1 << 11) - 1),
127 1.0f / ((1 << 12) - 1),
128 1.0f / ((1 << 13) - 1),
129 1.0f / ((1 << 14) - 1),
130 1.0f / ((1 << 15) - 1),
131 };
132 int a_size, r_size, g_size, b_size;
133 int a_shift, r_shift, g_shift, b_shift;
134 float a_mul, r_mul, g_mul, b_mul;
135 uint32_t a_mask, r_mask, g_mask, b_mask;
136 int i;
137
138 if (!PIXMAN_FORMAT_VIS (format))
139 format = PIXMAN_a8r8g8b8;
140
141 /*
142 * Determine the sizes of each component and the masks and shifts
143 * required to extract them from the source pixel.
144 */
145 a_size = PIXMAN_FORMAT_A (format);
146 r_size = PIXMAN_FORMAT_R (format);
147 g_size = PIXMAN_FORMAT_G (format);
148 b_size = PIXMAN_FORMAT_B (format);
149
150 a_shift = 32 - a_size;
151 r_shift = 24 - r_size;
152 g_shift = 16 - g_size;
153 b_shift = 8 - b_size;
154
155 a_mask = ((1 << a_size) - 1);
156 r_mask = ((1 << r_size) - 1);
157 g_mask = ((1 << g_size) - 1);
158 b_mask = ((1 << b_size) - 1);
159
160 a_mul = multipliers[a_size];
161 r_mul = multipliers[r_size];
162 g_mul = multipliers[g_size];
163 b_mul = multipliers[b_size];
164
165 /* Start at the end so that we can do the expansion in place
166 * when src == dst
167 */
168 for (i = width - 1; i >= 0; i--)
169 {
170 const uint32_t pixel = src[i];
171
172 dst[i].a = a_mask? ((pixel >> a_shift) & a_mask) * a_mul : 1.0f;
173 dst[i].r = ((pixel >> r_shift) & r_mask) * r_mul;
174 dst[i].g = ((pixel >> g_shift) & g_mask) * g_mul;
175 dst[i].b = ((pixel >> b_shift) & b_mask) * b_mul;
176 }
177 }
178
179 uint16_t
pixman_float_to_unorm(float f,int n_bits)180 pixman_float_to_unorm (float f, int n_bits)
181 {
182 return float_to_unorm (f, n_bits);
183 }
184
185 float
pixman_unorm_to_float(uint16_t u,int n_bits)186 pixman_unorm_to_float (uint16_t u, int n_bits)
187 {
188 return unorm_to_float (u, n_bits);
189 }
190
191 void
pixman_contract_from_float(uint32_t * dst,const argb_t * src,int width)192 pixman_contract_from_float (uint32_t *dst,
193 const argb_t *src,
194 int width)
195 {
196 int i;
197
198 for (i = 0; i < width; ++i)
199 {
200 uint8_t a, r, g, b;
201
202 a = float_to_unorm (src[i].a, 8);
203 r = float_to_unorm (src[i].r, 8);
204 g = float_to_unorm (src[i].g, 8);
205 b = float_to_unorm (src[i].b, 8);
206
207 dst[i] = (a << 24) | (r << 16) | (g << 8) | (b << 0);
208 }
209 }
210
211 uint32_t *
_pixman_iter_get_scanline_noop(pixman_iter_t * iter,const uint32_t * mask)212 _pixman_iter_get_scanline_noop (pixman_iter_t *iter, const uint32_t *mask)
213 {
214 return iter->buffer;
215 }
216
217 #define N_TMP_BOXES (16)
218
219 pixman_bool_t
pixman_region16_copy_from_region32(pixman_region16_t * dst,pixman_region32_t * src)220 pixman_region16_copy_from_region32 (pixman_region16_t *dst,
221 pixman_region32_t *src)
222 {
223 int n_boxes, i;
224 pixman_box32_t *boxes32;
225 pixman_box16_t *boxes16;
226 pixman_bool_t retval;
227
228 boxes32 = pixman_region32_rectangles (src, &n_boxes);
229
230 boxes16 = pixman_malloc_ab (n_boxes, sizeof (pixman_box16_t));
231
232 if (!boxes16)
233 return FALSE;
234
235 for (i = 0; i < n_boxes; ++i)
236 {
237 boxes16[i].x1 = boxes32[i].x1;
238 boxes16[i].y1 = boxes32[i].y1;
239 boxes16[i].x2 = boxes32[i].x2;
240 boxes16[i].y2 = boxes32[i].y2;
241 }
242
243 pixman_region_fini (dst);
244 retval = pixman_region_init_rects (dst, boxes16, n_boxes);
245 free (boxes16);
246 return retval;
247 }
248
249 pixman_bool_t
pixman_region32_copy_from_region16(pixman_region32_t * dst,pixman_region16_t * src)250 pixman_region32_copy_from_region16 (pixman_region32_t *dst,
251 pixman_region16_t *src)
252 {
253 int n_boxes, i;
254 pixman_box16_t *boxes16;
255 pixman_box32_t *boxes32;
256 pixman_box32_t tmp_boxes[N_TMP_BOXES];
257 pixman_bool_t retval;
258
259 boxes16 = pixman_region_rectangles (src, &n_boxes);
260
261 if (n_boxes > N_TMP_BOXES)
262 boxes32 = pixman_malloc_ab (n_boxes, sizeof (pixman_box32_t));
263 else
264 boxes32 = tmp_boxes;
265
266 if (!boxes32)
267 return FALSE;
268
269 for (i = 0; i < n_boxes; ++i)
270 {
271 boxes32[i].x1 = boxes16[i].x1;
272 boxes32[i].y1 = boxes16[i].y1;
273 boxes32[i].x2 = boxes16[i].x2;
274 boxes32[i].y2 = boxes16[i].y2;
275 }
276
277 pixman_region32_fini (dst);
278 retval = pixman_region32_init_rects (dst, boxes32, n_boxes);
279
280 if (boxes32 != tmp_boxes)
281 free (boxes32);
282
283 return retval;
284 }
285
286 /* This function is exported for the sake of the test suite and not part
287 * of the ABI.
288 */
289 PIXMAN_EXPORT pixman_implementation_t *
_pixman_internal_only_get_implementation(void)290 _pixman_internal_only_get_implementation (void)
291 {
292 return get_implementation ();
293 }
294
295 void
_pixman_log_error(const char * function,const char * message)296 _pixman_log_error (const char *function, const char *message)
297 {
298 static int n_messages = 0;
299
300 if (n_messages < 10)
301 {
302 fprintf (stderr,
303 "*** BUG ***\n"
304 "In %s: %s\n"
305 "Set a breakpoint on '_pixman_log_error' to debug\n\n",
306 function, message);
307
308 n_messages++;
309 }
310 }
311