void draw(SkCanvas* canvas) {
SkPaint p;
p.setAntiAlias(true);
SkMatrix m;
int pos = 0;
for (SkScalar sx : { 1, 2 } ) {
for (SkScalar kx : { 0, 1 } ) {
m.setAll(sx, kx, 16, 0, 1, 32, 0, 0, 1);
bool isSimilarity = m.isSimilarity();
bool preservesRightAngles = m.preservesRightAngles();
SkString str;
str.printf("sx: %g kx: %g %s %s", sx, kx, isSimilarity ? "sim" : "",
preservesRightAngles ? "right" : "");
SkAutoCanvasRestore autoRestore(canvas, true);
canvas->concat(m);
canvas->drawString(str, 0, pos, p);
pos += 20;
}
}
}
// The general idea here is to, conceptually, start with the original polygon and slide
// the vertices along the bisectors until the first intersection. At that
// point two of the edges collapse and the process repeats on the new polygon.
// The polygon state is captured in the Ring class while the GrAAConvexTessellator
// controls the iteration. The CandidateVerts holds the formative points for the
// next ring.
bool GrAAConvexTessellator::tessellate(const SkMatrix& m, const SkPath& path) {
if (!this->extractFromPath(m, path)) {
return false;
}
SkScalar coverage = 1.0f;
SkScalar scaleFactor = 0.0f;
if (fStrokeWidth >= 0.0f) {
SkASSERT(m.isSimilarity());
scaleFactor = m.getMaxScale(); // x and y scale are the same
SkScalar effectiveStrokeWidth = scaleFactor * fStrokeWidth;
Ring outerStrokeRing;
this->createOuterRing(fInitialRing, effectiveStrokeWidth / 2 - kAntialiasingRadius,
coverage, &outerStrokeRing);
outerStrokeRing.init(*this);
Ring outerAARing;
this->createOuterRing(outerStrokeRing, kAntialiasingRadius * 2, 0.0f, &outerAARing);
} else {
Ring outerAARing;
this->createOuterRing(fInitialRing, kAntialiasingRadius, 0.0f, &outerAARing);
}
// the bisectors are only needed for the computation of the outer ring
fBisectors.rewind();
if (fStrokeWidth >= 0.0f && fInitialRing.numPts() > 2) {
SkScalar effectiveStrokeWidth = scaleFactor * fStrokeWidth;
Ring* insetStrokeRing;
SkScalar strokeDepth = effectiveStrokeWidth / 2 - kAntialiasingRadius;
if (this->createInsetRings(fInitialRing, 0.0f, coverage, strokeDepth, coverage,
&insetStrokeRing)) {
Ring* insetAARing;
this->createInsetRings(*insetStrokeRing, strokeDepth, coverage, strokeDepth +
kAntialiasingRadius * 2, 0.0f, &insetAARing);
}
} else {
Ring* insetAARing;
this->createInsetRings(fInitialRing, 0.0f, 0.5f, kAntialiasingRadius, 1.0f, &insetAARing);
}
SkDEBUGCODE(this->validate();)
return true;
// TODO just use class params
// TODO trying to figure out why lcd is so whack
sk_sp<GrGeometryProcessor> GrAtlasTextBatch::setupDfProcessor(const SkMatrix& viewMatrix,
SkColor filteredColor,
GrColor color,
GrTexture* texture) const {
GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
bool isLCD = this->isLCD();
// set up any flags
uint32_t flags = viewMatrix.isSimilarity() ? kSimilarity_DistanceFieldEffectFlag : 0;
flags |= viewMatrix.isScaleTranslate() ? kScaleOnly_DistanceFieldEffectFlag : 0;
flags |= fUseGammaCorrectDistanceTable ? kGammaCorrect_DistanceFieldEffectFlag : 0;
// see if we need to create a new effect
if (isLCD) {
flags |= kUseLCD_DistanceFieldEffectFlag;
flags |= fUseBGR ? kBGR_DistanceFieldEffectFlag : 0;
GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor);
float redCorrection = fDistanceAdjustTable->getAdjustment(
GrColorUnpackR(colorNoPreMul) >> kDistanceAdjustLumShift,
fUseGammaCorrectDistanceTable);
float greenCorrection = fDistanceAdjustTable->getAdjustment(
GrColorUnpackG(colorNoPreMul) >> kDistanceAdjustLumShift,
fUseGammaCorrectDistanceTable);
float blueCorrection = fDistanceAdjustTable->getAdjustment(
GrColorUnpackB(colorNoPreMul) >> kDistanceAdjustLumShift,
fUseGammaCorrectDistanceTable);
GrDistanceFieldLCDTextGeoProc::DistanceAdjust widthAdjust =
GrDistanceFieldLCDTextGeoProc::DistanceAdjust::Make(redCorrection,
greenCorrection,
blueCorrection);
return GrDistanceFieldLCDTextGeoProc::Make(color,
viewMatrix,
texture,
params,
widthAdjust,
flags,
this->usesLocalCoords());
} else {
bool GrAALinearizingConvexPathRenderer::canDrawPath(const GrDrawTarget* target,
const GrPipelineBuilder*,
const SkMatrix& viewMatrix,
const SkPath& path,
const GrStrokeInfo& stroke,
bool antiAlias) const {
if (!antiAlias) {
return false;
}
if (path.isInverseFillType()) {
return false;
}
if (!path.isConvex()) {
return false;
}
if (stroke.getStyle() == SkStrokeRec::kStroke_Style) {
return viewMatrix.isSimilarity() && stroke.getWidth() >= 1.0f &&
stroke.getWidth() <= kMaxStrokeWidth && !stroke.isDashed() &&
SkPathPriv::LastVerbIsClose(path) && stroke.getJoin() != SkPaint::Join::kRound_Join;
}
return stroke.getStyle() == SkStrokeRec::kFill_Style;
}
static void test_matrix_is_similarity(skiatest::Reporter* reporter) {
SkMatrix mat;
// identity
mat.setIdentity();
REPORTER_ASSERT(reporter, mat.isSimilarity());
// translation only
mat.reset();
mat.setTranslate(SkIntToScalar(100), SkIntToScalar(100));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with same size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with one negative
mat.reset();
mat.setScale(SkIntToScalar(-15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scale with same size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective x
mat.reset();
mat.setPerspX(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective y
mat.reset();
mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// rotate
for (int angle = 0; angle < 360; ++angle) {
mat.reset();
mat.setRotate(SkIntToScalar(angle));
REPORTER_ASSERT(reporter, mat.isSimilarity());
}
// see if there are any accumulated precision issues
mat.reset();
for (int i = 1; i < 360; i++) {
mat.postRotate(SkIntToScalar(1));
}
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + translate
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postTranslate(SkIntToScalar(10), SkIntToScalar(20));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + non-uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(3), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// all zero
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// all zero except perspective
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, SK_Scalar1);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scales zero, only skews
mat.setAll(0, SK_Scalar1, 0,
SK_Scalar1, 0, 0,
0, 0, SkMatrix::I()[8]);
REPORTER_ASSERT(reporter, mat.isSimilarity());
}
static void test_matrix_is_similarity(skiatest::Reporter* reporter) {
SkMatrix mat;
// identity
mat.setIdentity();
REPORTER_ASSERT(reporter, mat.isSimilarity());
// translation only
mat.reset();
mat.setTranslate(SkIntToScalar(100), SkIntToScalar(100));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with same size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with one negative
mat.reset();
mat.setScale(SkIntToScalar(-15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scale with same size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective x
mat.reset();
mat.setPerspX(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective y
mat.reset();
mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
#ifdef SK_SCALAR_IS_FLOAT
/* We bypass the following tests for SK_SCALAR_IS_FIXED build.
* The long discussion can be found in this issue:
* http://codereview.appspot.com/5999050/
* In short, we haven't found a perfect way to fix the precision
* issue, i.e. the way we use tolerance in isSimilarityTransformation
* is incorrect. The situation becomes worse in fixed build, so
* we disabled rotation related tests for fixed build.
*/
// rotate
for (int angle = 0; angle < 360; ++angle) {
mat.reset();
mat.setRotate(SkIntToScalar(angle));
REPORTER_ASSERT(reporter, mat.isSimilarity());
}
// see if there are any accumulated precision issues
mat.reset();
for (int i = 1; i < 360; i++) {
mat.postRotate(SkIntToScalar(1));
}
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + translate
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postTranslate(SkIntToScalar(10), SkIntToScalar(20));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + non-uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(3), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
#endif
// all zero
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// all zero except perspective
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, SK_Scalar1);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scales zero, only skews
mat.setAll(0, SK_Scalar1, 0,
SK_Scalar1, 0, 0,
0, 0, SkMatrix::I()[8]);
REPORTER_ASSERT(reporter, mat.isSimilarity());
}
static void test_matrix_is_similarity(skiatest::Reporter* reporter) {
SkMatrix mat;
// identity
mat.setIdentity();
REPORTER_ASSERT(reporter, mat.isSimilarity());
// translation only
mat.reset();
mat.setTranslate(SkIntToScalar(100), SkIntToScalar(100));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with same size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with one negative
mat.reset();
mat.setScale(SkIntToScalar(-15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scale with same size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// scale with different size at a pivot point
mat.reset();
mat.setScale(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with same size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(15),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// skew with different size at a pivot point
mat.reset();
mat.setSkew(SkIntToScalar(15), SkIntToScalar(20),
SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective x
mat.reset();
mat.setPerspX(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// perspective y
mat.reset();
mat.setPerspY(SkScalarToPersp(SK_Scalar1 / 2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// rotate
for (int angle = 0; angle < 360; ++angle) {
mat.reset();
mat.setRotate(SkIntToScalar(angle));
#ifndef SK_CPU_ARM64
REPORTER_ASSERT(reporter, mat.isSimilarity());
#else
// 64-bit ARM devices built with -O2 and -ffp-contract=fast have a loss
// of precision and require that we have a higher tolerance
REPORTER_ASSERT(reporter, mat.isSimilarity(SK_ScalarNearlyZero + 0.00010113f));
#endif
}
// see if there are any accumulated precision issues
mat.reset();
for (int i = 1; i < 360; i++) {
mat.postRotate(SkIntToScalar(1));
}
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + translate
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postTranslate(SkIntToScalar(10), SkIntToScalar(20));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(2), SkIntToScalar(2));
REPORTER_ASSERT(reporter, mat.isSimilarity());
// rotate + non-uniform scale
mat.reset();
mat.setRotate(SkIntToScalar(30));
mat.postScale(SkIntToScalar(3), SkIntToScalar(2));
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// all zero
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// all zero except perspective
mat.setAll(0, 0, 0, 0, 0, 0, 0, 0, SK_Scalar1);
REPORTER_ASSERT(reporter, !mat.isSimilarity());
// scales zero, only skews
mat.setAll(0, SK_Scalar1, 0,
SK_Scalar1, 0, 0,
0, 0, SkMatrix::I()[8]);
REPORTER_ASSERT(reporter, mat.isSimilarity());
}