pdfrum-page 0.1.0

Content-stream interpreter, graphics state, colorspaces, shadings
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//! PDFium's sRGB gamma-encoding sample tables, transcribed verbatim.
//!
//! Two byte tables sampling the sRGB transfer function on 1024 steps: the
//! first 192 steps at full resolution, the rest at every fourth step. The
//! branch and index arithmetic that reads them is
//! `super::cie::rgb_conversion`.

/// Samples for scaled inputs below [`SAMPLES1_LEN`].
pub(crate) static SRGB_SAMPLES1: [u8; 192] = [
    0, 3, 6, 10, 13, 15, 18, 20, 22, 23, 25, 27, 28, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 41,
    42, 43, 44, 45, 46, 47, 48, 49, 49, 50, 51, 52, 53, 53, 54, 55, 56, 56, 57, 58, 58, 59, 60, 61,
    61, 62, 62, 63, 64, 64, 65, 66, 66, 67, 67, 68, 68, 69, 70, 70, 71, 71, 72, 72, 73, 73, 74, 74,
    75, 76, 76, 77, 77, 78, 78, 79, 79, 79, 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 85, 86,
    86, 87, 87, 88, 88, 88, 89, 89, 90, 90, 91, 91, 91, 92, 92, 93, 93, 93, 94, 94, 95, 95, 95, 96,
    96, 97, 97, 97, 98, 98, 98, 99, 99, 99, 100, 100, 101, 101, 101, 102, 102, 102, 103, 103, 103,
    104, 104, 104, 105, 105, 106, 106, 106, 107, 107, 107, 108, 108, 108, 109, 109, 109, 110, 110,
    110, 110, 111, 111, 111, 112, 112, 112, 113, 113, 113, 114, 114, 114, 115, 115, 115, 115, 116,
    116, 116, 117, 117, 117, 118, 118, 118, 118, 119, 119, 119, 120,
];

/// Number of entries in [`SRGB_SAMPLES1`]; also the branch threshold.
pub(crate) const SAMPLES1_LEN: usize = 192;

/// Samples for scaled inputs at or above [`SAMPLES1_LEN`], one per four steps.
pub(crate) static SRGB_SAMPLES2: [u8; 208] = [
    120, 121, 122, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
    140, 141, 142, 143, 144, 145, 146, 147, 148, 148, 149, 150, 151, 152, 153, 154, 155, 155, 156,
    157, 158, 159, 159, 160, 161, 162, 163, 163, 164, 165, 166, 167, 167, 168, 169, 170, 170, 171,
    172, 173, 173, 174, 175, 175, 176, 177, 178, 178, 179, 180, 180, 181, 182, 182, 183, 184, 185,
    185, 186, 187, 187, 188, 189, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 196, 196, 197,
    197, 198, 199, 199, 200, 200, 201, 202, 202, 203, 203, 204, 205, 205, 206, 206, 207, 208, 208,
    209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216, 216, 217, 218, 218, 219,
    219, 220, 220, 221, 221, 222, 222, 223, 223, 224, 224, 225, 226, 226, 227, 227, 228, 228, 229,
    229, 230, 230, 231, 231, 232, 232, 233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238,
    238, 239, 239, 240, 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 246, 247,
    247, 248, 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255,
];