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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorMatrix.h"
#include "SkFlattenableBuffers.h"
#define kRScale 0
#define kGScale 6
#define kBScale 12
#define kAScale 18
void SkColorMatrix::setIdentity() {
memset(fMat, 0, sizeof(fMat));
fMat[kRScale] = fMat[kGScale] = fMat[kBScale] = fMat[kAScale] = SK_Scalar1;
}
void SkColorMatrix::setScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
SkScalar aScale) {
memset(fMat, 0, sizeof(fMat));
fMat[kRScale] = rScale;
fMat[kGScale] = gScale;
fMat[kBScale] = bScale;
fMat[kAScale] = aScale;
}
///////////////////////////////////////////////////////////////////////////////
void SkColorMatrix::setRotate(Axis axis, SkScalar degrees) {
SkScalar S, C;
S = SkScalarSinCos(SkDegreesToRadians(degrees), &C);
this->setSinCos(axis, S, C);
}
void SkColorMatrix::setSinCos(Axis axis, SkScalar sine, SkScalar cosine) {
SkASSERT((unsigned)axis < 3);
static const uint8_t gRotateIndex[] = {
6, 7, 11, 12,
0, 10, 2, 12,
0, 1, 5, 6,
};
const uint8_t* index = gRotateIndex + axis * 4;
this->setIdentity();
fMat[index[0]] = cosine;
fMat[index[1]] = sine;
fMat[index[2]] = -sine;
fMat[index[3]] = cosine;
}
void SkColorMatrix::preRotate(Axis axis, SkScalar degrees) {
SkColorMatrix tmp;
tmp.setRotate(axis, degrees);
this->preConcat(tmp);
}
void SkColorMatrix::postRotate(Axis axis, SkScalar degrees) {
SkColorMatrix tmp;
tmp.setRotate(axis, degrees);
this->postConcat(tmp);
}
///////////////////////////////////////////////////////////////////////////////
void SkColorMatrix::setConcat(const SkColorMatrix& matA,
const SkColorMatrix& matB) {
SkScalar tmp[20];
SkScalar* result = fMat;
if (&matA == this || &matB == this) {
result = tmp;
}
const SkScalar* a = matA.fMat;
const SkScalar* b = matB.fMat;
int index = 0;
for (int j = 0; j < 20; j += 5) {
for (int i = 0; i < 4; i++) {
result[index++] = SkScalarMul(a[j + 0], b[i + 0]) +
SkScalarMul(a[j + 1], b[i + 5]) +
SkScalarMul(a[j + 2], b[i + 10]) +
SkScalarMul(a[j + 3], b[i + 15]);
}
result[index++] = SkScalarMul(a[j + 0], b[4]) +
SkScalarMul(a[j + 1], b[9]) +
SkScalarMul(a[j + 2], b[14]) +
SkScalarMul(a[j + 3], b[19]) +
a[j + 4];
}
if (fMat != result) {
memcpy(fMat, result, sizeof(fMat));
}
}
///////////////////////////////////////////////////////////////////////////////
static void setrow(SkScalar row[], SkScalar r, SkScalar g, SkScalar b) {
row[0] = r;
row[1] = g;
row[2] = b;
}
static const SkScalar kHueR = 0.213f;
static const SkScalar kHueG = 0.715f;
static const SkScalar kHueB = 0.072f;
void SkColorMatrix::setSaturation(SkScalar sat) {
memset(fMat, 0, sizeof(fMat));
const SkScalar R = SkScalarMul(kHueR, SK_Scalar1 - sat);
const SkScalar G = SkScalarMul(kHueG, SK_Scalar1 - sat);
const SkScalar B = SkScalarMul(kHueB, SK_Scalar1 - sat);
setrow(fMat + 0, R + sat, G, B);
setrow(fMat + 5, R, G + sat, B);
setrow(fMat + 10, R, G, B + sat);
fMat[18] = SK_Scalar1;
}
static const SkScalar kR2Y = 0.299f;
static const SkScalar kG2Y = 0.587f;
static const SkScalar kB2Y = 0.114f;
static const SkScalar kR2U = -0.16874f;
static const SkScalar kG2U = -0.33126f;
static const SkScalar kB2U = 0.5f;
static const SkScalar kR2V = 0.5f;
static const SkScalar kG2V = -0.41869f;
static const SkScalar kB2V = -0.08131f;
void SkColorMatrix::setRGB2YUV() {
memset(fMat, 0, sizeof(fMat));
setrow(fMat + 0, kR2Y, kG2Y, kB2Y);
setrow(fMat + 5, kR2U, kG2U, kB2U);
setrow(fMat + 10, kR2V, kG2V, kB2V);
fMat[18] = SK_Scalar1;
}
static const SkScalar kV2R = 1.402f;
static const SkScalar kU2G = -0.34414f;
static const SkScalar kV2G = -0.71414f;
static const SkScalar kU2B = 1.772f;
void SkColorMatrix::setYUV2RGB() {
memset(fMat, 0, sizeof(fMat));
setrow(fMat + 0, SK_Scalar1, 0, kV2R);
setrow(fMat + 5, SK_Scalar1, kU2G, kV2G);
setrow(fMat + 10, SK_Scalar1, kU2B, 0);
fMat[18] = SK_Scalar1;
}
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