| /* |
| * 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" |
| |
| void SkColorMatrix::setIdentity() { |
| memset(fMat, 0, sizeof(fMat)); |
| fMat[kR_Scale] = fMat[kG_Scale] = fMat[kB_Scale] = fMat[kA_Scale] = 1; |
| } |
| |
| void SkColorMatrix::setScale(SkScalar rScale, SkScalar gScale, SkScalar bScale, |
| SkScalar aScale) { |
| memset(fMat, 0, sizeof(fMat)); |
| fMat[kR_Scale] = rScale; |
| fMat[kG_Scale] = gScale; |
| fMat[kB_Scale] = bScale; |
| fMat[kA_Scale] = aScale; |
| } |
| |
| void SkColorMatrix::postTranslate(SkScalar dr, SkScalar dg, SkScalar db, |
| SkScalar da) { |
| fMat[kR_Trans] += dr; |
| fMat[kG_Trans] += dg; |
| fMat[kB_Trans] += db; |
| fMat[kA_Trans] += da; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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 = kHueR * (1 - sat); |
| const SkScalar G = kHueG * (1 - sat); |
| const SkScalar B = kHueB * (1 - sat); |
| |
| setrow(fMat + 0, R + sat, G, B); |
| setrow(fMat + 5, R, G + sat, B); |
| setrow(fMat + 10, R, G, B + sat); |
| fMat[kA_Scale] = 1; |
| } |
| |
| 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[kA_Scale] = 1; |
| } |
| |
| 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, 1, 0, kV2R); |
| setrow(fMat + 5, 1, kU2G, kV2G); |
| setrow(fMat + 10, 1, kU2B, 0); |
| fMat[kA_Scale] = 1; |
| } |