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halffloat.h

halffloat.h 10 KB
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  1. /* vim: set ts=8 sw=8 noexpandtab: */
    2. 

  2. //  qcms
    3. 

  3. //  Copyright (C) 2009 Mozilla Foundation
    4. 

  4. //  Copyright (C) 1998-2007 Marti Maria
    5. 

  5. //
    6. 

  6. // Permission is hereby granted, free of charge, to any person obtaining 
    7. 

  7. // a copy of this software and associated documentation files (the "Software"), 
    8. 

  8. // to deal in the Software without restriction, including without limitation 
    9. 

  9. // the rights to use, copy, modify, merge, publish, distribute, sublicense, 
    10. 

  10. // and/or sell copies of the Software, and to permit persons to whom the Software 
    11. 

  11. // is furnished to do so, subject to the following conditions:
    12. 

  12. //
    13. 

  13. // The above copyright notice and this permission notice shall be included in 
    14. 

  14. // all copies or substantial portions of the Software.
    15. 

  15. //
    16. 

  16. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
    17. 

  17. // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
    18. 

  18. // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
    19. 

  19. // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
    20. 

  20. // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
    21. 

  21. // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
    22. 

  22. // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23. 

  23. 

  24. #ifndef _QCMS_HALFFLOAT_H
    25. 

  25. #define _QCMS_HALFFLOAT_H
    26. 

  26. 

  27. const unsigned short qcms_half_float_base_table[512] = {
    28. 

  28.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    29. 

  29.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    30. 

  30.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    31. 

  31.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    32. 

  32.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    33. 

  33.         0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,
    34. 

  34.         0,      0,      0,      0,      0,      0,      0,      1,      2,      4,      8,      16,     32,     64,     128,    256,
    35. 

  35.         512,    1024,   2048,   3072,   4096,   5120,   6144,   7168,   8192,   9216,   10240,  11264,  12288,  13312,  14336,  15360,
    36. 

  36.         16384,  17408,  18432,  19456,  20480,  21504,  22528,  23552,  24576,  25600,  26624,  27648,  28672,  29696,  30720,  31744,
    37. 

  37.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    38. 

  38.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    39. 

  39.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    40. 

  40.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    41. 

  41.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    42. 

  42.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    43. 

  43.         31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,  31744,
    44. 

  44.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    45. 

  45.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    46. 

  46.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    47. 

  47.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    48. 

  48.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    49. 

  49.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,  32768,
    50. 

  50.         32768,  32768,  32768,  32768,  32768,  32768,  32768,  32769,  32770,  32772,  32776,  32784,  32800,  32832,  32896,  33024,
    51. 

  51.         33280,  33792,  34816,  35840,  36864,  37888,  38912,  39936,  40960,  41984,  43008,  44032,  45056,  46080,  47104,  48128,
    52. 

  52.         49152,  50176,  51200,  52224,  53248,  54272,  55296,  56320,  57344,  58368,  59392,  60416,  61440,  62464,  63488,  64512,
    53. 

  53.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    54. 

  54.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    55. 

  55.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    56. 

  56.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    57. 

  57.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    58. 

  58.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,
    59. 

  59.         64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512,  64512
    60. 

  60. };
    61. 

  61. 

  62. const unsigned char qcms_half_float_shift_table[512] = {
    63. 

  63.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    64. 

  64.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    65. 

  65.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    66. 

  66.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    67. 

  67.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    68. 

  68.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    69. 

  69.         24,     24,     24,     24,     24,     24,     24,     23,     22,     21,     20,     19,     18,     17,     16,     15,
    70. 

  70.         14,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,
    71. 

  71.         13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     24,
    72. 

  72.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    73. 

  73.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    74. 

  74.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    75. 

  75.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    76. 

  76.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    77. 

  77.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    78. 

  78.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     13,
    79. 

  79.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    80. 

  80.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    81. 

  81.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    82. 

  82.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    83. 

  83.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    84. 

  84.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    85. 

  85.         24,     24,     24,     24,     24,     24,     24,     23,     22,     21,     20,     19,     18,     17,     16,     15,
    86. 

  86.         14,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,
    87. 

  87.         13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     13,     24,
    88. 

  88.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    89. 

  89.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    90. 

  90.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    91. 

  91.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    92. 

  92.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    93. 

  93.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,
    94. 

  94.         24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     24,     13
    95. 

  95. };
    96. 

  96. 

  97. static inline unsigned short float_to_half_float(float f)
    98. 

  98. {
    99. 

  99. 	// See Blink::Source/platform/graphics/gpu/WebGLImageConversion.cpp::convertFloatToHalfFloat() and http://crbug.com/491784
    100. 

  100. 

  101. 	unsigned temp = *((unsigned *)(&f));
    102. 

  102. 	unsigned signexp = (temp >> 23) & 0x1ff;
    103. 

  103. 	return qcms_half_float_base_table[signexp] + ((temp & 0x007fffff) >> qcms_half_float_shift_table[signexp]);
    104. 

  104. }
    105. 

  105. 

  106. #endif
    107.