SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
SkASSERT(hsv);
SkScalar s = SkScalarPin(hsv[1], 0, 1);
SkScalar v = SkScalarPin(hsv[2], 0, 1);
U8CPU v_byte = SkScalarRoundToInt(v * 255);
if (SkScalarNearlyZero(s)) { // shade of gray
return SkColorSetARGB(a, v_byte, v_byte, v_byte);
}
SkScalar hx = (hsv[0] < 0 || hsv[0] >= SkIntToScalar(360)) ? 0 : hsv[0]/60;
SkScalar w = SkScalarFloorToScalar(hx);
SkScalar f = hx - w;
unsigned p = SkScalarRoundToInt((SK_Scalar1 - s) * v * 255);
unsigned q = SkScalarRoundToInt((SK_Scalar1 - (s * f)) * v * 255);
unsigned t = SkScalarRoundToInt((SK_Scalar1 - (s * (SK_Scalar1 - f))) * v * 255);
unsigned r, g, b;
SkASSERT((unsigned)(w) < 6);
switch ((unsigned)(w)) {
case 0: r = v_byte; g = t; b = p; break;
case 1: r = q; g = v_byte; b = p; break;
case 2: r = p; g = v_byte; b = t; break;
case 3: r = p; g = q; b = v_byte; break;
case 4: r = t; g = p; b = v_byte; break;
default: r = v_byte; g = p; b = q; break;
}
return SkColorSetARGB(a, r, g, b);
}
SkHighContrast_Filter(const SkHighContrastConfig& config) {
fConfig = config;
// Clamp contrast to just inside -1 to 1 to avoid division by zero.
fConfig.fContrast = SkScalarPin(fConfig.fContrast,
-1.0f + FLT_EPSILON,
1.0f - FLT_EPSILON);
}
bool ScrollableLayerAndroid::scrollTo(int x, int y)
{
SkIRect scrollBounds;
getScrollRect(&scrollBounds);
if (!scrollBounds.fRight && !scrollBounds.fBottom)
return false;
SkScalar newX = SkScalarPin(x, 0, scrollBounds.fRight);
SkScalar newY = SkScalarPin(y, 0, scrollBounds.fBottom);
// Check for no change.
if (newX == scrollBounds.fLeft && newY == scrollBounds.fTop)
return false;
setPosition(m_scrollLimits.fLeft - newX, m_scrollLimits.fTop - newY);
return true;
}
static U16CPU SkScalarToUnit(SkScalar x) {
SkScalar pin = SkScalarPin(x, 0, SK_Scalar1);
#ifdef SK_SCALAR_IS_FLOAT
return (int) (pin * 65535.0f);
#else
return pin - (pin >= 32768);
#endif
}
bool onClick(const SkPoint& clickPos) override {
SkASSERT(fParent);
SkScalar x = SkScalarPin(clickPos.fX, 0.0f, fSliderRange);
int numChoices = fMax - fMin + 1;
*fOutput = SkTMin(SkScalarFloorToInt(numChoices * x / fSliderRange) + fMin, fMax);
return true;
}
GrTextureDomain::GrTextureDomain(const SkRect& domain, Mode mode, int index)
: fIndex(index) {
static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
if (domain.contains(kFullRect) && kClamp_Mode == mode) {
fMode = kIgnore_Mode;
} else {
fMode = mode;
}
if (fMode != kIgnore_Mode) {
// We don't currently handle domains that are empty or don't intersect the texture.
// It is OK if the domain rect is a line or point, but it should not be inverted. We do not
// handle rects that do not intersect the [0..1]x[0..1] rect.
SkASSERT(domain.fLeft <= domain.fRight);
SkASSERT(domain.fTop <= domain.fBottom);
fDomain.fLeft = SkScalarPin(domain.fLeft, kFullRect.fLeft, kFullRect.fRight);
fDomain.fRight = SkScalarPin(domain.fRight, kFullRect.fLeft, kFullRect.fRight);
fDomain.fTop = SkScalarPin(domain.fTop, kFullRect.fTop, kFullRect.fBottom);
fDomain.fBottom = SkScalarPin(domain.fBottom, kFullRect.fTop, kFullRect.fBottom);
SkASSERT(fDomain.fLeft <= fDomain.fRight);
SkASSERT(fDomain.fTop <= fDomain.fBottom);
}
}
sk_sp<SkMaskFilter> SkBlurMaskFilter::MakeEmboss(SkScalar blurSigma, const SkScalar direction[3],
SkScalar ambient, SkScalar specular) {
if (direction == nullptr) {
return nullptr;
}
SkEmbossMaskFilter::Light light;
memcpy(light.fDirection, direction, sizeof(light.fDirection));
// ambient should be 0...1 as a scalar
light.fAmbient = SkUnitScalarClampToByte(ambient);
// specular should be 0..15.99 as a scalar
static const SkScalar kSpecularMultiplier = SkIntToScalar(255) / 16;
light.fSpecular = static_cast<U8CPU>(SkScalarPin(specular, 0, 16) * kSpecularMultiplier + 0.5);
return SkEmbossMaskFilter::Make(blurSigma, light);
}
void onDrawContent(SkCanvas* canvas) override {
SkASSERT(fParent);
SkScalar x = fSliderRange * (*fOutput - fMin) / (fMax - fMin);
fSlider.offsetTo(SkScalarPin(x, 0.0f, fSliderRange), fSlider.fTop);
SkString valueStr;
valueStr.appendScalar(*fOutput);
this->drawLabel(canvas, valueStr);
SkPaint sliderPaint;
sliderPaint.setColor(0xFFF3F3F3);
canvas->drawRect(fSlider, sliderPaint);
SkPaint ctrlRegionPaint;
ctrlRegionPaint.setColor(0xFFFFFFFF);
ctrlRegionPaint.setStyle(SkPaint::kStroke_Style);
ctrlRegionPaint.setStrokeWidth(2.0f);
canvas->drawRect(fCtrlRegion, ctrlRegionPaint);
}
bool SkOperandInterpolator::setKeyFrame(int index, SkMSec time, const SkOperand values[], SkScalar blend)
{
SkASSERT(values != NULL);
blend = SkScalarPin(blend, 0, SK_Scalar1);
bool success = ~index == SkTSearch<SkMSec>(&fTimes->fTime, index, time, sizeof(SkTimeCode));
SkASSERT(success);
if (success) {
SkTimeCode* timeCode = &fTimes[index];
timeCode->fTime = time;
timeCode->fBlend[0] = SK_Scalar1 - blend;
timeCode->fBlend[1] = 0;
timeCode->fBlend[2] = 0;
timeCode->fBlend[3] = SK_Scalar1 - blend;
SkOperand* dst = &fValues[fElemCount * index];
memcpy(dst, values, fElemCount * sizeof(SkOperand));
}
return success;
}
sk_sp<SkShader> SkShader::MakeCompose(sk_sp<SkShader> dst, sk_sp<SkShader> src, SkBlendMode mode,
float lerpT) {
if (!src || !dst || SkScalarIsNaN(lerpT)) {
return nullptr;
}
lerpT = SkScalarPin(lerpT, 0, 1);
if (lerpT == 0) {
return dst;
} else if (lerpT == 1) {
if (mode == SkBlendMode::kSrc) {
return src;
}
if (mode == SkBlendMode::kDst) {
return dst;
}
}
return sk_sp<SkShader>(new SkComposeShader(std::move(dst), std::move(src), mode, lerpT));
}
SkScalar SkPerlinNoiseShader::PerlinNoiseShaderContext::calculateTurbulenceValueForPoint(
int channel, StitchData& stitchData, const SkPoint& point) const {
const SkPerlinNoiseShader& perlinNoiseShader = static_cast<const SkPerlinNoiseShader&>(fShader);
if (perlinNoiseShader.fStitchTiles) {
// Set up TurbulenceInitial stitch values.
stitchData = fPaintingData->fStitchDataInit;
}
SkScalar turbulenceFunctionResult = 0;
SkPoint noiseVector(SkPoint::Make(SkScalarMul(point.x(), fPaintingData->fBaseFrequency.fX),
SkScalarMul(point.y(), fPaintingData->fBaseFrequency.fY)));
SkScalar ratio = SK_Scalar1;
for (int octave = 0; octave < perlinNoiseShader.fNumOctaves; ++octave) {
SkScalar noise = noise2D(channel, stitchData, noiseVector);
SkScalar numer = (perlinNoiseShader.fType == kFractalNoise_Type) ?
noise : SkScalarAbs(noise);
turbulenceFunctionResult += numer / ratio;
noiseVector.fX *= 2;
noiseVector.fY *= 2;
ratio *= 2;
if (perlinNoiseShader.fStitchTiles) {
// Update stitch values
stitchData.fWidth *= 2;
stitchData.fWrapX = stitchData.fWidth + kPerlinNoise;
stitchData.fHeight *= 2;
stitchData.fWrapY = stitchData.fHeight + kPerlinNoise;
}
}
// The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
// by fractalNoise and (turbulenceFunctionResult) by turbulence.
if (perlinNoiseShader.fType == kFractalNoise_Type) {
turbulenceFunctionResult =
SkScalarMul(turbulenceFunctionResult, SK_ScalarHalf) + SK_ScalarHalf;
}
if (channel == 3) { // Scale alpha by paint value
turbulenceFunctionResult *= SkIntToScalar(getPaintAlpha()) / 255;
}
// Clamp result
return SkScalarPin(turbulenceFunctionResult, 0, SK_Scalar1);
}
SkGradientShaderBase::SkGradientShaderBase(const Descriptor& desc, const SkMatrix& ptsToUnit)
: INHERITED(desc.fLocalMatrix)
, fPtsToUnit(ptsToUnit)
{
fPtsToUnit.getType(); // Precache so reads are threadsafe.
SkASSERT(desc.fCount > 1);
fGradFlags = SkToU8(desc.fGradFlags);
SkASSERT((unsigned)desc.fTileMode < SkShader::kTileModeCount);
SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs));
fTileMode = desc.fTileMode;
fTileProc = gTileProcs[desc.fTileMode];
/* Note: we let the caller skip the first and/or last position.
i.e. pos[0] = 0.3, pos[1] = 0.7
In these cases, we insert dummy entries to ensure that the final data
will be bracketed by [0, 1].
i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1
Thus colorCount (the caller's value, and fColorCount (our value) may
differ by up to 2. In the above example:
colorCount = 2
fColorCount = 4
*/
fColorCount = desc.fCount;
// check if we need to add in dummy start and/or end position/colors
bool dummyFirst = false;
bool dummyLast = false;
if (desc.fPos) {
dummyFirst = desc.fPos[0] != 0;
dummyLast = desc.fPos[desc.fCount - 1] != SK_Scalar1;
fColorCount += dummyFirst + dummyLast;
}
if (fColorCount > kColorStorageCount) {
size_t size = sizeof(SkColor) + sizeof(Rec);
if (desc.fPos) {
size += sizeof(SkScalar);
}
fOrigColors = reinterpret_cast<SkColor*>(
sk_malloc_throw(size * fColorCount));
}
else {
fOrigColors = fStorage;
}
// Now copy over the colors, adding the dummies as needed
{
SkColor* origColors = fOrigColors;
if (dummyFirst) {
*origColors++ = desc.fColors[0];
}
memcpy(origColors, desc.fColors, desc.fCount * sizeof(SkColor));
if (dummyLast) {
origColors += desc.fCount;
*origColors = desc.fColors[desc.fCount - 1];
}
}
if (desc.fPos && fColorCount) {
fOrigPos = (SkScalar*)(fOrigColors + fColorCount);
fRecs = (Rec*)(fOrigPos + fColorCount);
} else {
fOrigPos = nullptr;
fRecs = (Rec*)(fOrigColors + fColorCount);
}
if (fColorCount > 2) {
Rec* recs = fRecs;
recs->fPos = 0;
// recs->fScale = 0; // unused;
recs += 1;
if (desc.fPos) {
SkScalar* origPosPtr = fOrigPos;
*origPosPtr++ = 0;
/* We need to convert the user's array of relative positions into
fixed-point positions and scale factors. We need these results
to be strictly monotonic (no two values equal or out of order).
Hence this complex loop that just jams a zero for the scale
value if it sees a segment out of order, and it assures that
we start at 0 and end at 1.0
*/
SkScalar prev = 0;
int startIndex = dummyFirst ? 0 : 1;
int count = desc.fCount + dummyLast;
for (int i = startIndex; i < count; i++) {
// force the last value to be 1.0
SkScalar curr;
if (i == desc.fCount) { // we're really at the dummyLast
curr = 1;
} else {
curr = SkScalarPin(desc.fPos[i], 0, 1);
}
*origPosPtr++ = curr;
recs->fPos = SkScalarToFixed(curr);
SkFixed diff = SkScalarToFixed(curr - prev);
if (diff > 0) {
recs->fScale = (1 << 24) / diff;
} else {
recs->fScale = 0; // ignore this segment
}
// get ready for the next value
prev = curr;
recs += 1;
}
} else { // assume even distribution
fOrigPos = nullptr;
SkFixed dp = SK_Fixed1 / (desc.fCount - 1);
SkFixed p = dp;
SkFixed scale = (desc.fCount - 1) << 8; // (1 << 24) / dp
for (int i = 1; i < desc.fCount - 1; i++) {
recs->fPos = p;
recs->fScale = scale;
recs += 1;
p += dp;
}
recs->fPos = SK_Fixed1;
recs->fScale = scale;
}
} else if (desc.fPos) {
SkASSERT(2 == fColorCount);
fOrigPos[0] = SkScalarPin(desc.fPos[0], 0, 1);
fOrigPos[1] = SkScalarPin(desc.fPos[1], fOrigPos[0], 1);
if (0 == fOrigPos[0] && 1 == fOrigPos[1]) {
fOrigPos = nullptr;
}
}
this->initCommon();
}
static inline GrPoint sanitizePoint(const GrPoint& pt) {
GrPoint r;
r.fX = SkScalarPin(pt.fX, -kMaxVertexValue, kMaxVertexValue);
r.fY = SkScalarPin(pt.fY, -kMaxVertexValue, kMaxVertexValue);
return r;
}
bool onClick(const SkPoint& clickPos) override {
SkASSERT(fParent);
SkScalar x = SkScalarPin(clickPos.fX, 0.0f, fSliderRange);
*fOutput = (x/fSliderRange) * (fMax - fMin) + fMin;
return true;
}
