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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 "include/effects/SkColorMatrix.h"
- #include "include/private/SkFloatingPoint.h"
- enum {
- kR_Scale = 0,
- kG_Scale = 6,
- kB_Scale = 12,
- kA_Scale = 18,
- kR_Trans = 4,
- kG_Trans = 9,
- kB_Trans = 14,
- kA_Trans = 19,
- };
- static void set_concat(float result[20], const float outer[20], const float inner[20]) {
- float tmp[20];
- float* target;
- if (outer == result || inner == result) {
- target = tmp; // will memcpy answer when we're done into result
- } else {
- target = result;
- }
- int index = 0;
- for (int j = 0; j < 20; j += 5) {
- for (int i = 0; i < 4; i++) {
- target[index++] = outer[j + 0] * inner[i + 0] +
- outer[j + 1] * inner[i + 5] +
- outer[j + 2] * inner[i + 10] +
- outer[j + 3] * inner[i + 15];
- }
- target[index++] = outer[j + 0] * inner[4] +
- outer[j + 1] * inner[9] +
- outer[j + 2] * inner[14] +
- outer[j + 3] * inner[19] +
- outer[j + 4];
- }
- if (target != result) {
- memcpy(result, target, 20 * sizeof(float));
- }
- }
- void SkColorMatrix::setIdentity() {
- memset(fMat, 0, sizeof(fMat));
- fMat[kR_Scale] = fMat[kG_Scale] = fMat[kB_Scale] = fMat[kA_Scale] = 1;
- }
- void SkColorMatrix::setScale(float rScale, float gScale, float bScale, float 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(float dr, float dg, float db, float da) {
- fMat[kR_Trans] += dr;
- fMat[kG_Trans] += dg;
- fMat[kB_Trans] += db;
- fMat[kA_Trans] += da;
- }
- ///////////////////////////////////////////////////////////////////////////////
- void SkColorMatrix::setRotate(Axis axis, float degrees) {
- float r = sk_float_degrees_to_radians(degrees);
- this->setSinCos(axis, sk_float_sin(r), sk_float_cos(r));
- }
- void SkColorMatrix::setSinCos(Axis axis, float sine, float 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, float degrees) {
- SkColorMatrix tmp;
- tmp.setRotate(axis, degrees);
- this->preConcat(tmp);
- }
- void SkColorMatrix::postRotate(Axis axis, float degrees) {
- SkColorMatrix tmp;
- tmp.setRotate(axis, degrees);
- this->postConcat(tmp);
- }
- void SkColorMatrix::setConcat(const SkColorMatrix& matA, const SkColorMatrix& matB) {
- set_concat(fMat, matA.fMat, matB.fMat);
- }
- ///////////////////////////////////////////////////////////////////////////////
- static void setrow(float row[], float r, float g, float b) {
- row[0] = r;
- row[1] = g;
- row[2] = b;
- }
- static const float kHueR = 0.213f;
- static const float kHueG = 0.715f;
- static const float kHueB = 0.072f;
- void SkColorMatrix::setSaturation(float sat) {
- memset(fMat, 0, sizeof(fMat));
- const float R = kHueR * (1 - sat);
- const float G = kHueG * (1 - sat);
- const float 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 float kR2Y = 0.299f;
- static const float kG2Y = 0.587f;
- static const float kB2Y = 0.114f;
- static const float kR2U = -0.16874f;
- static const float kG2U = -0.33126f;
- static const float kB2U = 0.5f;
- static const float kR2V = 0.5f;
- static const float kG2V = -0.41869f;
- static const float 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 float kV2R = 1.402f;
- static const float kU2G = -0.34414f;
- static const float kV2G = -0.71414f;
- static const float 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;
- }
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