diff options
Diffstat (limited to 'third_party/skcms/skcms.h')
| -rw-r--r-- | third_party/skcms/skcms.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/third_party/skcms/skcms.h b/third_party/skcms/skcms.h index 08779a40e6..9c25b1d538 100644 --- a/third_party/skcms/skcms.h +++ b/third_party/skcms/skcms.h @@ -73,6 +73,12 @@ typedef struct skcms_A2B { skcms_Curve output_curves[3]; } skcms_A2B; +// A specialized approximation for transfer functions with gamma between 1 and 3. +// f(x) = sign(x) * (A|x|^3 + B|x|^2 + (1-A-B)|x|) +typedef struct skcms_TF13 { + float A,B; +} skcms_TF13; + typedef struct skcms_ICCProfile { const uint8_t* buffer; @@ -97,6 +103,10 @@ typedef struct skcms_ICCProfile { // and has_A2B to true. bool has_A2B; skcms_A2B A2B; + + // If has_trc, we may be able to approximate the curves more efficiently. + bool has_tf13[3]; + skcms_TF13 tf13[3]; } skcms_ICCProfile; // The sRGB color profile is so commonly used that we offer a canonical skcms_ICCProfile for it. @@ -114,15 +124,13 @@ bool skcms_ApproximatelyEqualProfiles(const skcms_ICCProfile* A, const skcms_ICC // will be used. bool skcms_Parse(const void*, size_t, skcms_ICCProfile*); +// skcms_Parse() creates a profile that directs skcms_Transform() to favor accuracy. +// If you want to trade a little accuracy for a big speedup, call skcms_OptimizeForSpeed(). +void skcms_OptimizeForSpeed(skcms_ICCProfile*); + bool skcms_ApproximateCurve(const skcms_Curve* curve, skcms_TransferFunction* approx, float* max_error); -// A specialized approximation for transfer functions with gamma between 1 and 3. -// f(x) = Ax^3 + Bx^2 + (1-A-B)x -typedef struct skcms_TF13 { - float A,B; -} skcms_TF13; - bool skcms_ApproximateCurve13(const skcms_Curve* curve, skcms_TF13* approx, float* max_error); // What is the best single transfer function to use for the given profile? Note that there is |