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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrColorSpaceXform.h"
#include "SkColorSpace.h"
#include "SkColorSpace_Base.h"
#include "SkMatrix44.h"
static inline bool sk_float_almost_equals(float x, float y, float tol) {
return sk_float_abs(x - y) <= tol;
}
static inline bool matrix_is_almost_identity(const SkMatrix44& m,
SkMScalar tol = SK_MScalar1 / (1 << 12)) {
return
sk_float_almost_equals(m.getFloat(0, 0), 1.0f, tol) &&
sk_float_almost_equals(m.getFloat(0, 1), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(0, 2), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(0, 3), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(1, 0), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(1, 1), 1.0f, tol) &&
sk_float_almost_equals(m.getFloat(1, 2), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(1, 3), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(2, 0), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(2, 1), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(2, 2), 1.0f, tol) &&
sk_float_almost_equals(m.getFloat(2, 3), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(3, 0), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(3, 1), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(3, 2), 0.0f, tol) &&
sk_float_almost_equals(m.getFloat(3, 3), 1.0f, tol);
}
GrColorSpaceXform::GrColorSpaceXform(const SkMatrix44& srcToDst)
: fSrcToDst(srcToDst) {}
sk_sp<GrColorSpaceXform> GrColorSpaceXform::Make(SkColorSpace* src, SkColorSpace* dst) {
if (!src || !dst) {
// Invalid
return nullptr;
}
if (src == dst) {
// Quick equality check - no conversion needed in this case
return nullptr;
}
const SkMatrix44* toXYZD50 = as_CSB(src)->toXYZD50();
const SkMatrix44* fromXYZD50 = as_CSB(dst)->fromXYZD50();
if (!toXYZD50 || !fromXYZD50) {
// unsupported colour spaces -- cannot specify gamut as a matrix
return nullptr;
}
SkMatrix44 srcToDst(SkMatrix44::kUninitialized_Constructor);
srcToDst.setConcat(*fromXYZD50, *toXYZD50);
if (matrix_is_almost_identity(srcToDst)) {
return nullptr;
}
return sk_make_sp<GrColorSpaceXform>(srcToDst);
}
bool GrColorSpaceXform::Equals(const GrColorSpaceXform* a, const GrColorSpaceXform* b) {
if (a == b) {
return true;
}
if (!a || !b) {
return false;
}
return a->fSrcToDst == b->fSrcToDst;
}
GrColor4f GrColorSpaceXform::apply(const GrColor4f& srcColor) {
GrColor4f result;
fSrcToDst.mapScalars(srcColor.fRGBA, result.fRGBA);
return result;
}
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