The Tor Browser: gfx/qcms/transform

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.

     1 /* vim: set ts=8 sw=8 noexpandtab: */

     2 //  qcms

     3 //  Copyright (C) 2009 Mozilla Foundation

     4 //  Copyright (C) 1998-2007 Marti Maria

     5 //

     6 // Permission is hereby granted, free of charge, to any person obtaining

     7 // a copy of this software and associated documentation files (the "Software"),

     8 // to deal in the Software without restriction, including without limitation

     9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,

    10 // and/or sell copies of the Software, and to permit persons to whom the Software

    11 // is furnished to do so, subject to the following conditions:

    12 //

    13 // The above copyright notice and this permission notice shall be included in

    14 // all copies or substantial portions of the Software.

    15 //

    16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO

    18 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

    19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

    20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

    21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

    22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    24 #ifndef _QCMS_TRANSFORM_UTIL_H

    25 #define _QCMS_TRANSFORM_UTIL_H

    27 #include <stdlib.h>

    29 #define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3]

    31 //XXX: could use a bettername

    32 typedef uint16_t uint16_fract_t;

    34 float lut_interp_linear(double value, uint16_t *table, int length);

    35 float lut_interp_linear_float(float value, float *table, int length);

    36 uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length);

    39 static inline float lerp(float a, float b, float t)

    40 {

    41         return a*(1.f-t) + b*t;

    42 }

    44 static inline unsigned char clamp_u8(float v)

    45 {

    46   if (v > 255.)

    47     return 255;

    48   else if (v < 0)

    49     return 0;

    50   else

    51     return floorf(v+.5);

    52 }

    54 static inline float clamp_float(float a)

    55 {

    56   /* One would naturally write this function as the following:

    57   if (a > 1.)

    58     return 1.;

    59   else if (a < 0)

    60     return 0;

    61   else

    62     return a;

    64   However, that version will let NaNs pass through which is undesirable

    65   for most consumers.

    66   */

    68   if (a > 1.)

    69     return 1.;

    70   else if (a >= 0)

    71     return a;

    72   else // a < 0 or a is NaN

    73     return 0;

    74 }

    76 static inline float u8Fixed8Number_to_float(uint16_t x)

    77 {

    78   // 0x0000 = 0.

    79   // 0x0100 = 1.

    80   // 0xffff = 255  + 255/256

    81   return x/256.;

    82 }

    84 float *build_input_gamma_table(struct curveType *TRC);

    85 struct matrix build_colorant_matrix(qcms_profile *p);

    86 void build_output_lut(struct curveType *trc,

    87                       uint16_t **output_gamma_lut, size_t *output_gamma_lut_length);

    89 struct matrix matrix_invert(struct matrix mat);

    90 qcms_bool compute_precache(struct curveType *trc, uint8_t *output);

    93 #endif

The Tor Browser / file revision

gfx/qcms/transform_util.h@97036ab72558

gfx/qcms/transform_util.h