gfx/qcms/transform_util.h@97036ab72558 (annotated)
gfx/qcms/transform_util.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* vim: set ts=8 sw=8 noexpandtab: */ |
| michael@0 | 2 | // qcms |
| michael@0 | 3 | // Copyright (C) 2009 Mozilla Foundation |
| michael@0 | 4 | // Copyright (C) 1998-2007 Marti Maria |
| michael@0 | 5 | // |
| michael@0 | 6 | // Permission is hereby granted, free of charge, to any person obtaining |
| michael@0 | 7 | // a copy of this software and associated documentation files (the "Software"), |
| michael@0 | 8 | // to deal in the Software without restriction, including without limitation |
| michael@0 | 9 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| michael@0 | 10 | // and/or sell copies of the Software, and to permit persons to whom the Software |
| michael@0 | 11 | // is furnished to do so, subject to the following conditions: |
| michael@0 | 12 | // |
| michael@0 | 13 | // The above copyright notice and this permission notice shall be included in |
| michael@0 | 14 | // all copies or substantial portions of the Software. |
| michael@0 | 15 | // |
| michael@0 | 16 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| michael@0 | 17 | // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO |
| michael@0 | 18 | // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| michael@0 | 19 | // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| michael@0 | 20 | // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| michael@0 | 21 | // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| michael@0 | 22 | // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| michael@0 | 23 | |
| michael@0 | 24 | #ifndef _QCMS_TRANSFORM_UTIL_H |
| michael@0 | 25 | #define _QCMS_TRANSFORM_UTIL_H |
| michael@0 | 26 | |
| michael@0 | 27 | #include <stdlib.h> |
| michael@0 | 28 | |
| michael@0 | 29 | #define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3] |
| michael@0 | 30 | |
| michael@0 | 31 | //XXX: could use a bettername |
| michael@0 | 32 | typedef uint16_t uint16_fract_t; |
| michael@0 | 33 | |
| michael@0 | 34 | float lut_interp_linear(double value, uint16_t *table, int length); |
| michael@0 | 35 | float lut_interp_linear_float(float value, float *table, int length); |
| michael@0 | 36 | uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length); |
| michael@0 | 37 | |
| michael@0 | 38 | |
| michael@0 | 39 | static inline float lerp(float a, float b, float t) |
| michael@0 | 40 | { |
| michael@0 | 41 | return a*(1.f-t) + b*t; |
| michael@0 | 42 | } |
| michael@0 | 43 | |
| michael@0 | 44 | static inline unsigned char clamp_u8(float v) |
| michael@0 | 45 | { |
| michael@0 | 46 | if (v > 255.) |
| michael@0 | 47 | return 255; |
| michael@0 | 48 | else if (v < 0) |
| michael@0 | 49 | return 0; |
| michael@0 | 50 | else |
| michael@0 | 51 | return floorf(v+.5); |
| michael@0 | 52 | } |
| michael@0 | 53 | |
| michael@0 | 54 | static inline float clamp_float(float a) |
| michael@0 | 55 | { |
| michael@0 | 56 | /* One would naturally write this function as the following: |
| michael@0 | 57 | if (a > 1.) |
| michael@0 | 58 | return 1.; |
| michael@0 | 59 | else if (a < 0) |
| michael@0 | 60 | return 0; |
| michael@0 | 61 | else |
| michael@0 | 62 | return a; |
| michael@0 | 63 | |
| michael@0 | 64 | However, that version will let NaNs pass through which is undesirable |
| michael@0 | 65 | for most consumers. |
| michael@0 | 66 | */ |
| michael@0 | 67 | |
| michael@0 | 68 | if (a > 1.) |
| michael@0 | 69 | return 1.; |
| michael@0 | 70 | else if (a >= 0) |
| michael@0 | 71 | return a; |
| michael@0 | 72 | else // a < 0 or a is NaN |
| michael@0 | 73 | return 0; |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | static inline float u8Fixed8Number_to_float(uint16_t x) |
| michael@0 | 77 | { |
| michael@0 | 78 | // 0x0000 = 0. |
| michael@0 | 79 | // 0x0100 = 1. |
| michael@0 | 80 | // 0xffff = 255 + 255/256 |
| michael@0 | 81 | return x/256.; |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | float *build_input_gamma_table(struct curveType *TRC); |
| michael@0 | 85 | struct matrix build_colorant_matrix(qcms_profile *p); |
| michael@0 | 86 | void build_output_lut(struct curveType *trc, |
| michael@0 | 87 | uint16_t **output_gamma_lut, size_t *output_gamma_lut_length); |
| michael@0 | 88 | |
| michael@0 | 89 | struct matrix matrix_invert(struct matrix mat); |
| michael@0 | 90 | qcms_bool compute_precache(struct curveType *trc, uint8_t *output); |
| michael@0 | 91 | |
| michael@0 | 92 | |
| michael@0 | 93 | #endif |
