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-rw-r--r--src/gui/painting/qrasterizer.cpp180
1 files changed, 96 insertions, 84 deletions
diff --git a/src/gui/painting/qrasterizer.cpp b/src/gui/painting/qrasterizer.cpp
index f8f8afb..4fded1f 100644
--- a/src/gui/painting/qrasterizer.cpp
+++ b/src/gui/painting/qrasterizer.cpp
@@ -65,6 +65,12 @@ typedef int Q16Dot16;
#define COORD_ROUNDING 1 // 0: round up, 1: round down
#define COORD_OFFSET 32 // 26.6, 32 is half a pixel
+static inline QT_FT_Vector PointToVector(const QPointF &p)
+{
+ QT_FT_Vector result = { QT_FT_Pos(p.x() * 64), QT_FT_Pos(p.y() * 64) };
+ return result;
+}
+
class QSpanBuffer {
public:
QSpanBuffer(ProcessSpans blend, void *data, const QRect &clipRect)
@@ -693,9 +699,9 @@ static Q16Dot16 intersectPixelFP(int x, Q16Dot16 top, Q16Dot16 bottom, Q16Dot16
}
}
-static inline bool q16Dot16Compare(qreal p1, qreal p2)
+static inline bool q26Dot6Compare(qreal p1, qreal p2)
{
- return FloatToQ16Dot16(p2 - p1) == 0;
+ return int((p2 - p1) * 64.) == 0;
}
static inline qreal qFloorF(qreal v)
@@ -708,6 +714,12 @@ static inline qreal qFloorF(qreal v)
return floor(v);
}
+static inline QPointF snapTo26Dot6Grid(const QPointF &p)
+{
+ return QPointF(qFloorF(p.x() * 64) * (1 / qreal(64)),
+ qFloorF(p.y() * 64) * (1 / qreal(64)));
+}
+
void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width, bool squareCap)
{
if (a == b || width == 0 || d->clipRect.isEmpty())
@@ -718,17 +730,21 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
QPointF pa = a;
QPointF pb = b;
- QPointF offs = QPointF(qAbs(b.y() - a.y()), qAbs(b.x() - a.x())) * width * 0.5;
- if (squareCap)
- offs += QPointF(offs.y(), offs.x());
+ if (squareCap) {
+ QPointF delta = pb - pa;
+ pa -= (0.5f * width) * delta;
+ pb += (0.5f * width) * delta;
+ }
+
+ QPointF offs = QPointF(qAbs(b.y() - a.y()), qAbs(b.x() - a.x())) * width * 0.5;
const QRectF clip(d->clipRect.topLeft() - offs, d->clipRect.bottomRight() + QPoint(1, 1) + offs);
- if (!clip.contains(a) || !clip.contains(b)) {
+ if (!clip.contains(pa) || !clip.contains(pb)) {
qreal t1 = 0;
qreal t2 = 1;
- const qreal o[2] = { a.x(), a.y() };
- const qreal d[2] = { b.x() - a.x(), b.y() - a.y() };
+ const qreal o[2] = { pa.x(), pa.y() };
+ const qreal d[2] = { pb.x() - pa.x(), pb.y() - pa.y() };
const qreal low[2] = { clip.left(), clip.top() };
const qreal high[2] = { clip.right(), clip.bottom() };
@@ -751,8 +767,12 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
if (t1 >= t2)
return;
}
- pa = a + (b - a) * t1;
- pb = a + (b - a) * t2;
+
+ QPointF npa = pa + (pb - pa) * t1;
+ QPointF npb = pa + (pb - pa) * t2;
+
+ pa = npa;
+ pb = npb;
}
if (!d->antialiased) {
@@ -763,15 +783,6 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
}
{
- const qreal gridResolution = 64;
- const qreal reciprocal = 1 / gridResolution;
-
- // snap to grid to prevent large slopes
- pa.rx() = qFloorF(pa.rx() * gridResolution) * reciprocal;
- pa.ry() = qFloorF(pa.ry() * gridResolution) * reciprocal;
- pb.rx() = qFloorF(pb.rx() * gridResolution) * reciprocal;
- pb.ry() = qFloorF(pb.ry() * gridResolution) * reciprocal;
-
// old delta
const QPointF d0 = a - b;
const qreal w0 = d0.x() * d0.x() + d0.y() * d0.y();
@@ -789,7 +800,7 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
QSpanBuffer buffer(d->blend, d->data, d->clipRect);
- if (q16Dot16Compare(pa.y(), pb.y())) {
+ if (q26Dot6Compare(pa.y(), pb.y())) {
const qreal x = (pa.x() + pb.x()) * 0.5f;
const qreal dx = qAbs(pb.x() - pa.x()) * 0.5f;
@@ -799,26 +810,16 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
pa = QPointF(x, y - dy);
pb = QPointF(x, y + dy);
- if (squareCap)
- width = 1 / width + 1.0f;
- else
- width = 1 / width;
-
- squareCap = false;
+ width = 1 / width;
}
- if (q16Dot16Compare(pa.x(), pb.x())) {
+ if (q26Dot6Compare(pa.x(), pb.x())) {
if (pa.y() > pb.y())
qSwap(pa, pb);
const qreal dy = pb.y() - pa.y();
const qreal halfWidth = 0.5f * width * dy;
- if (squareCap) {
- pa.ry() -= halfWidth;
- pb.ry() += halfWidth;
- }
-
qreal left = pa.x() - halfWidth;
qreal right = pa.x() + halfWidth;
@@ -828,7 +829,7 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
pa.ry() = qBound(qreal(d->clipRect.top()), pa.y(), qreal(d->clipRect.bottom() + 1));
pb.ry() = qBound(qreal(d->clipRect.top()), pb.y(), qreal(d->clipRect.bottom() + 1));
- if (q16Dot16Compare(left, right) || q16Dot16Compare(pa.y(), pb.y()))
+ if (q26Dot6Compare(left, right) || q26Dot6Compare(pa.y(), pb.y()))
return;
if (d->antialiased) {
@@ -899,11 +900,6 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
delta *= 0.5f * width;
const QPointF perp(delta.y(), -delta.x());
- if (squareCap) {
- pa -= delta;
- pb += delta;
- }
-
QPointF top;
QPointF left;
QPointF right;
@@ -921,14 +917,36 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
bottom = pb + perp;
}
+ top = snapTo26Dot6Grid(top);
+ bottom = snapTo26Dot6Grid(bottom);
+ left = snapTo26Dot6Grid(left);
+ right = snapTo26Dot6Grid(right);
+
const qreal topBound = qBound(qreal(d->clipRect.top()), top.y(), qreal(d->clipRect.bottom()));
const qreal bottomBound = qBound(qreal(d->clipRect.top()), bottom.y(), qreal(d->clipRect.bottom()));
- const qreal leftSlope = (left.x() - top.x()) / (left.y() - top.y());
- const qreal rightSlope = -1.0f / leftSlope;
+ const QPointF topLeftEdge = left - top;
+ const QPointF topRightEdge = right - top;
+ const QPointF bottomLeftEdge = bottom - left;
+ const QPointF bottomRightEdge = bottom - right;
+
+ const qreal topLeftSlope = topLeftEdge.x() / topLeftEdge.y();
+ const qreal bottomLeftSlope = bottomLeftEdge.x() / bottomLeftEdge.y();
+
+ const qreal topRightSlope = topRightEdge.x() / topRightEdge.y();
+ const qreal bottomRightSlope = bottomRightEdge.x() / bottomRightEdge.y();
+
+ const Q16Dot16 topLeftSlopeFP = FloatToQ16Dot16(topLeftSlope);
+ const Q16Dot16 topRightSlopeFP = FloatToQ16Dot16(topRightSlope);
- const Q16Dot16 leftSlopeFP = FloatToQ16Dot16(leftSlope);
- const Q16Dot16 rightSlopeFP = FloatToQ16Dot16(rightSlope);
+ const Q16Dot16 bottomLeftSlopeFP = FloatToQ16Dot16(bottomLeftSlope);
+ const Q16Dot16 bottomRightSlopeFP = FloatToQ16Dot16(bottomRightSlope);
+
+ const Q16Dot16 invTopLeftSlopeFP = FloatToQ16Dot16(1 / topLeftSlope);
+ const Q16Dot16 invTopRightSlopeFP = FloatToQ16Dot16(1 / topRightSlope);
+
+ const Q16Dot16 invBottomLeftSlopeFP = FloatToQ16Dot16(1 / bottomLeftSlope);
+ const Q16Dot16 invBottomRightSlopeFP = FloatToQ16Dot16(1 / bottomRightSlope);
if (d->antialiased) {
const Q16Dot16 iTopFP = IntToQ16Dot16(int(topBound));
@@ -936,16 +954,16 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
const Q16Dot16 iRightFP = IntToQ16Dot16(int(right.y()));
const Q16Dot16 iBottomFP = IntToQ16Dot16(int(bottomBound));
- Q16Dot16 leftIntersectAf = FloatToQ16Dot16(top.x() + (int(topBound) - top.y()) * leftSlope);
- Q16Dot16 rightIntersectAf = FloatToQ16Dot16(top.x() + (int(topBound) - top.y()) * rightSlope);
+ Q16Dot16 leftIntersectAf = FloatToQ16Dot16(top.x() + (int(topBound) - top.y()) * topLeftSlope);
+ Q16Dot16 rightIntersectAf = FloatToQ16Dot16(top.x() + (int(topBound) - top.y()) * topRightSlope);
Q16Dot16 leftIntersectBf = 0;
Q16Dot16 rightIntersectBf = 0;
if (iLeftFP < iTopFP)
- leftIntersectBf = FloatToQ16Dot16(left.x() + (int(topBound) - left.y()) * rightSlope);
+ leftIntersectBf = FloatToQ16Dot16(left.x() + (int(topBound) - left.y()) * bottomLeftSlope);
if (iRightFP < iTopFP)
- rightIntersectBf = FloatToQ16Dot16(right.x() + (int(topBound) - right.y()) * leftSlope);
+ rightIntersectBf = FloatToQ16Dot16(right.x() + (int(topBound) - right.y()) * bottomRightSlope);
Q16Dot16 rowTop, rowBottomLeft, rowBottomRight, rowTopLeft, rowTopRight, rowBottom;
Q16Dot16 topLeftIntersectAf, topLeftIntersectBf, topRightIntersectAf, topRightIntersectBf;
@@ -960,9 +978,9 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
rowTop = qMax(iTopFP, yTopFP);
topLeftIntersectAf = leftIntersectAf +
- Q16Dot16Multiply(leftSlopeFP, rowTop - iTopFP);
+ Q16Dot16Multiply(topLeftSlopeFP, rowTop - iTopFP);
topRightIntersectAf = rightIntersectAf +
- Q16Dot16Multiply(rightSlopeFP, rowTop - iTopFP);
+ Q16Dot16Multiply(topRightSlopeFP, rowTop - iTopFP);
Q16Dot16 yFP = iTopFP;
while (yFP <= iBottomFP) {
@@ -974,30 +992,30 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
if (yFP == iLeftFP) {
const int y = Q16Dot16ToInt(yFP);
- leftIntersectBf = FloatToQ16Dot16(left.x() + (y - left.y()) * rightSlope);
- topLeftIntersectBf = leftIntersectBf + Q16Dot16Multiply(rightSlopeFP, rowTopLeft - yFP);
- bottomLeftIntersectAf = leftIntersectAf + Q16Dot16Multiply(leftSlopeFP, rowBottomLeft - yFP);
+ leftIntersectBf = FloatToQ16Dot16(left.x() + (y - left.y()) * bottomLeftSlope);
+ topLeftIntersectBf = leftIntersectBf + Q16Dot16Multiply(bottomLeftSlopeFP, rowTopLeft - yFP);
+ bottomLeftIntersectAf = leftIntersectAf + Q16Dot16Multiply(topLeftSlopeFP, rowBottomLeft - yFP);
} else {
topLeftIntersectBf = leftIntersectBf;
- bottomLeftIntersectAf = leftIntersectAf + leftSlopeFP;
+ bottomLeftIntersectAf = leftIntersectAf + topLeftSlopeFP;
}
if (yFP == iRightFP) {
const int y = Q16Dot16ToInt(yFP);
- rightIntersectBf = FloatToQ16Dot16(right.x() + (y - right.y()) * leftSlope);
- topRightIntersectBf = rightIntersectBf + Q16Dot16Multiply(leftSlopeFP, rowTopRight - yFP);
- bottomRightIntersectAf = rightIntersectAf + Q16Dot16Multiply(rightSlopeFP, rowBottomRight - yFP);
+ rightIntersectBf = FloatToQ16Dot16(right.x() + (y - right.y()) * bottomRightSlope);
+ topRightIntersectBf = rightIntersectBf + Q16Dot16Multiply(bottomRightSlopeFP, rowTopRight - yFP);
+ bottomRightIntersectAf = rightIntersectAf + Q16Dot16Multiply(topRightSlopeFP, rowBottomRight - yFP);
} else {
topRightIntersectBf = rightIntersectBf;
- bottomRightIntersectAf = rightIntersectAf + rightSlopeFP;
+ bottomRightIntersectAf = rightIntersectAf + topRightSlopeFP;
}
if (yFP == iBottomFP) {
- bottomLeftIntersectBf = leftIntersectBf + Q16Dot16Multiply(rightSlopeFP, rowBottom - yFP);
- bottomRightIntersectBf = rightIntersectBf + Q16Dot16Multiply(leftSlopeFP, rowBottom - yFP);
+ bottomLeftIntersectBf = leftIntersectBf + Q16Dot16Multiply(bottomLeftSlopeFP, rowBottom - yFP);
+ bottomRightIntersectBf = rightIntersectBf + Q16Dot16Multiply(bottomRightSlopeFP, rowBottom - yFP);
} else {
- bottomLeftIntersectBf = leftIntersectBf + rightSlopeFP;
- bottomRightIntersectBf = rightIntersectBf + leftSlopeFP;
+ bottomLeftIntersectBf = leftIntersectBf + bottomLeftSlopeFP;
+ bottomRightIntersectBf = rightIntersectBf + bottomRightSlopeFP;
}
if (yFP < iLeftFP) {
@@ -1042,21 +1060,21 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
if (yFP <= iLeftFP)
excluded += intersectPixelFP(x, rowTop, rowBottomLeft,
bottomLeftIntersectAf, topLeftIntersectAf,
- leftSlopeFP, -rightSlopeFP);
+ topLeftSlopeFP, invTopLeftSlopeFP);
if (yFP >= iLeftFP)
excluded += intersectPixelFP(x, rowTopLeft, rowBottom,
topLeftIntersectBf, bottomLeftIntersectBf,
- rightSlopeFP, -leftSlopeFP);
+ bottomLeftSlopeFP, invBottomLeftSlopeFP);
if (x >= rightMin) {
if (yFP <= iRightFP)
excluded += (rowBottomRight - rowTop) - intersectPixelFP(x, rowTop, rowBottomRight,
topRightIntersectAf, bottomRightIntersectAf,
- rightSlopeFP, -leftSlopeFP);
+ topRightSlopeFP, invTopRightSlopeFP);
if (yFP >= iRightFP)
excluded += (rowBottom - rowTopRight) - intersectPixelFP(x, rowTopRight, rowBottom,
bottomRightIntersectBf, topRightIntersectBf,
- leftSlopeFP, -rightSlopeFP);
+ bottomRightSlopeFP, invBottomRightSlopeFP);
}
Q16Dot16 coverage = rowHeight - excluded;
@@ -1074,11 +1092,11 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
if (yFP <= iRightFP)
excluded += (rowBottomRight - rowTop) - intersectPixelFP(x, rowTop, rowBottomRight,
topRightIntersectAf, bottomRightIntersectAf,
- rightSlopeFP, -leftSlopeFP);
+ topRightSlopeFP, invTopRightSlopeFP);
if (yFP >= iRightFP)
excluded += (rowBottom - rowTopRight) - intersectPixelFP(x, rowTopRight, rowBottom,
bottomRightIntersectBf, topRightIntersectBf,
- leftSlopeFP, -rightSlopeFP);
+ bottomRightSlopeFP, invBottomRightSlopeFP);
Q16Dot16 coverage = rowHeight - excluded;
buffer.addSpan(x, 1, Q16Dot16ToInt(yFP),
@@ -1086,10 +1104,10 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
++x;
}
- leftIntersectAf += leftSlopeFP;
- leftIntersectBf += rightSlopeFP;
- rightIntersectAf += rightSlopeFP;
- rightIntersectBf += leftSlopeFP;
+ leftIntersectAf += topLeftSlopeFP;
+ leftIntersectBf += bottomLeftSlopeFP;
+ rightIntersectAf += topRightSlopeFP;
+ rightIntersectBf += bottomRightSlopeFP;
topLeftIntersectAf = leftIntersectAf;
topRightIntersectAf = rightIntersectAf;
@@ -1103,10 +1121,10 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
int iBottom = bottom.y() < 0.5f? -1 : int(bottom.y() - 0.5f);
int iMiddle = qMin(iLeft, iRight);
- Q16Dot16 leftIntersectAf = FloatToQ16Dot16(top.x() + 0.5f + (iTop + 0.5f - top.y()) * leftSlope);
- Q16Dot16 leftIntersectBf = FloatToQ16Dot16(left.x() + 0.5f + (iLeft + 1.5f - left.y()) * rightSlope);
- Q16Dot16 rightIntersectAf = FloatToQ16Dot16(top.x() - 0.5f + (iTop + 0.5f - top.y()) * rightSlope);
- Q16Dot16 rightIntersectBf = FloatToQ16Dot16(right.x() - 0.5f + (iRight + 1.5f - right.y()) * leftSlope);
+ Q16Dot16 leftIntersectAf = FloatToQ16Dot16(top.x() + 0.5f + (iTop + 0.5f - top.y()) * topLeftSlope);
+ Q16Dot16 leftIntersectBf = FloatToQ16Dot16(left.x() + 0.5f + (iLeft + 1.5f - left.y()) * bottomLeftSlope);
+ Q16Dot16 rightIntersectAf = FloatToQ16Dot16(top.x() - 0.5f + (iTop + 0.5f - top.y()) * topRightSlope);
+ Q16Dot16 rightIntersectBf = FloatToQ16Dot16(right.x() - 0.5f + (iRight + 1.5f - right.y()) * bottomRightSlope);
int ny;
int y = iTop;
@@ -1128,10 +1146,10 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
ri += rs; \
}
- DO_SEGMENT(iMiddle, leftIntersectAf, rightIntersectAf, leftSlopeFP, rightSlopeFP)
- DO_SEGMENT(iRight, leftIntersectBf, rightIntersectAf, rightSlopeFP, rightSlopeFP)
- DO_SEGMENT(iLeft, leftIntersectAf, rightIntersectBf, leftSlopeFP, leftSlopeFP)
- DO_SEGMENT(iBottom, leftIntersectBf, rightIntersectBf, rightSlopeFP, leftSlopeFP)
+ DO_SEGMENT(iMiddle, leftIntersectAf, rightIntersectAf, topLeftSlopeFP, topRightSlopeFP)
+ DO_SEGMENT(iRight, leftIntersectBf, rightIntersectAf, bottomLeftSlopeFP, topRightSlopeFP)
+ DO_SEGMENT(iLeft, leftIntersectAf, rightIntersectBf, topLeftSlopeFP, bottomRightSlopeFP);
+ DO_SEGMENT(iBottom, leftIntersectBf, rightIntersectBf, bottomLeftSlopeFP, bottomRightSlopeFP);
#undef DO_SEGMENT
}
}
@@ -1183,12 +1201,6 @@ void QRasterizer::rasterize(const QT_FT_Outline *outline, Qt::FillRule fillRule)
d->scanConverter.end();
}
-static inline QT_FT_Vector PointToVector(const QPointF &p)
-{
- QT_FT_Vector result = { QT_FT_Pos(p.x() * 64), QT_FT_Pos(p.y() * 64) };
- return result;
-}
-
void QRasterizer::rasterize(const QPainterPath &path, Qt::FillRule fillRule)
{
if (path.isEmpty())
generated by cgit v0.12 at 2024-11-15 00:33:19 (GMT)