diff options
author | Sebastian Rasmussen <sebras@gmail.com> | 2016-07-02 16:50:06 +0800 |
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committer | Sebastian Rasmussen <sebras@gmail.com> | 2016-07-06 11:20:18 +0800 |
commit | 10c8945851bf76bd22601411d2708fe2ff1bbea6 (patch) | |
tree | 06dfe9d30531a07609b533a38913837532db4544 /source/pdf | |
parent | 82a12b503d3382b82996705599959329ff8306d0 (diff) | |
download | mupdf-10c8945851bf76bd22601411d2708fe2ff1bbea6.tar.xz |
Expose LAB colorspace
Diffstat (limited to 'source/pdf')
-rw-r--r-- | source/pdf/pdf-colorspace.c | 43 |
1 files changed, 1 insertions, 42 deletions
diff --git a/source/pdf/pdf-colorspace.c b/source/pdf/pdf-colorspace.c index c3a8f9dd..8bec2707 100644 --- a/source/pdf/pdf-colorspace.c +++ b/source/pdf/pdf-colorspace.c @@ -45,47 +45,6 @@ load_icc_based(fz_context *ctx, pdf_document *doc, pdf_obj *dict) /* Lab */ -static inline float fung(float x) -{ - if (x >= 6.0f / 29.0f) - return x * x * x; - return (108.0f / 841.0f) * (x - (4.0f / 29.0f)); -} - -static void -lab_to_rgb(fz_context *ctx, fz_colorspace *cs, const float *lab, float *rgb) -{ - /* input is in range (0..100, -128..127, -128..127) not (0..1, 0..1, 0..1) */ - float lstar, astar, bstar, l, m, n, x, y, z, r, g, b; - lstar = lab[0]; - astar = lab[1]; - bstar = lab[2]; - m = (lstar + 16) / 116; - l = m + astar / 500; - n = m - bstar / 200; - x = fung(l); - y = fung(m); - z = fung(n); - r = (3.240449f * x + -1.537136f * y + -0.498531f * z) * 0.830026f; - g = (-0.969265f * x + 1.876011f * y + 0.041556f * z) * 1.05452f; - b = (0.055643f * x + -0.204026f * y + 1.057229f * z) * 1.1003f; - rgb[0] = sqrtf(fz_clamp(r, 0, 1)); - rgb[1] = sqrtf(fz_clamp(g, 0, 1)); - rgb[2] = sqrtf(fz_clamp(b, 0, 1)); -} - -static void -rgb_to_lab(fz_context *ctx, fz_colorspace *cs, const float *rgb, float *lab) -{ - fz_warn(ctx, "cannot convert into L*a*b colorspace"); - lab[0] = rgb[0]; - lab[1] = rgb[1]; - lab[2] = rgb[2]; -} - -static fz_colorspace k_device_lab = { {-1, fz_drop_colorspace_imp}, 0, "Lab", 3, lab_to_rgb, rgb_to_lab }; -static fz_colorspace *fz_device_lab = &k_device_lab; - /* Separation and DeviceN */ struct separation @@ -295,7 +254,7 @@ pdf_load_colorspace_imp(fz_context *ctx, pdf_document *doc, pdf_obj *obj) else if (pdf_name_eq(ctx, name, PDF_NAME_CalCMYK)) return fz_device_cmyk(ctx); else if (pdf_name_eq(ctx, name, PDF_NAME_Lab)) - return fz_device_lab; + return fz_device_lab(ctx); else { fz_colorspace *cs; |