--- a/jdk/src/share/classes/sun/java2d/pisces/Dasher.java Fri Oct 22 16:57:41 2010 +0400
+++ b/jdk/src/share/classes/sun/java2d/pisces/Dasher.java Tue Oct 26 10:39:23 2010 -0400
@@ -25,6 +25,8 @@
package sun.java2d.pisces;
+import sun.awt.geom.PathConsumer2D;
+
/**
* The <code>Dasher</code> class takes a series of linear commands
* (<code>moveTo</code>, <code>lineTo</code>, <code>close</code> and
@@ -36,18 +38,16 @@
* semantics are unclear.
*
*/
-public class Dasher implements LineSink {
- private final LineSink output;
+public class Dasher implements sun.awt.geom.PathConsumer2D {
+
+ private final PathConsumer2D out;
private final float[] dash;
private final float startPhase;
private final boolean startDashOn;
private final int startIdx;
- private final float m00, m10, m01, m11;
- private final float det;
-
- private boolean firstDashOn;
private boolean starting;
+ private boolean needsMoveTo;
private int idx;
private boolean dashOn;
@@ -55,28 +55,23 @@
private float sx, sy;
private float x0, y0;
- private float sx1, sy1;
+ // temporary storage for the current curve
+ private float[] curCurvepts;
/**
* Constructs a <code>Dasher</code>.
*
- * @param output an output <code>LineSink</code>.
- * @param dash an array of <code>int</code>s containing the dash pattern
- * @param phase an <code>int</code> containing the dash phase
- * @param transform a <code>Transform4</code> object indicating
- * the transform that has been previously applied to all incoming
- * coordinates. This is required in order to compute dash lengths
- * properly.
+ * @param out an output <code>PathConsumer2D</code>.
+ * @param dash an array of <code>float</code>s containing the dash pattern
+ * @param phase a <code>float</code> containing the dash phase
*/
- public Dasher(LineSink output,
- float[] dash, float phase,
- float a00, float a01, float a10, float a11) {
+ public Dasher(PathConsumer2D out, float[] dash, float phase) {
if (phase < 0) {
throw new IllegalArgumentException("phase < 0 !");
}
- this.output = output;
+ this.out = out;
// Normalize so 0 <= phase < dash[0]
int idx = 0;
@@ -92,16 +87,19 @@
this.startPhase = this.phase = phase;
this.startDashOn = dashOn;
this.startIdx = idx;
+ this.starting = true;
- m00 = a00;
- m01 = a01;
- m10 = a10;
- m11 = a11;
- det = m00 * m11 - m01 * m10;
+ // we need curCurvepts to be able to contain 2 curves because when
+ // dashing curves, we need to subdivide it
+ curCurvepts = new float[8 * 2];
}
public void moveTo(float x0, float y0) {
- output.moveTo(x0, y0);
+ if (firstSegidx > 0) {
+ out.moveTo(sx, sy);
+ emitFirstSegments();
+ }
+ needsMoveTo = true;
this.idx = startIdx;
this.dashOn = this.startDashOn;
this.phase = this.startPhase;
@@ -110,88 +108,108 @@
this.starting = true;
}
- public void lineJoin() {
- output.lineJoin();
+ private void emitSeg(float[] buf, int off, int type) {
+ switch (type) {
+ case 8:
+ out.curveTo(buf[off+0], buf[off+1],
+ buf[off+2], buf[off+3],
+ buf[off+4], buf[off+5]);
+ break;
+ case 6:
+ out.quadTo(buf[off+0], buf[off+1],
+ buf[off+2], buf[off+3]);
+ break;
+ case 4:
+ out.lineTo(buf[off], buf[off+1]);
+ }
}
- private void goTo(float x1, float y1) {
+ private void emitFirstSegments() {
+ for (int i = 0; i < firstSegidx; ) {
+ emitSeg(firstSegmentsBuffer, i+1, (int)firstSegmentsBuffer[i]);
+ i += (((int)firstSegmentsBuffer[i]) - 1);
+ }
+ firstSegidx = 0;
+ }
+
+ // We don't emit the first dash right away. If we did, caps would be
+ // drawn on it, but we need joins to be drawn if there's a closePath()
+ // So, we store the path elements that make up the first dash in the
+ // buffer below.
+ private float[] firstSegmentsBuffer = new float[7];
+ private int firstSegidx = 0;
+ // precondition: pts must be in relative coordinates (relative to x0,y0)
+ // fullCurve is true iff the curve in pts has not been split.
+ private void goTo(float[] pts, int off, final int type) {
+ float x = pts[off + type - 4];
+ float y = pts[off + type - 3];
if (dashOn) {
if (starting) {
- this.sx1 = x1;
- this.sy1 = y1;
- firstDashOn = true;
- starting = false;
+ firstSegmentsBuffer = Helpers.widenArray(firstSegmentsBuffer,
+ firstSegidx, type - 2);
+ firstSegmentsBuffer[firstSegidx++] = type;
+ System.arraycopy(pts, off, firstSegmentsBuffer, firstSegidx, type - 2);
+ firstSegidx += type - 2;
+ } else {
+ if (needsMoveTo) {
+ out.moveTo(x0, y0);
+ needsMoveTo = false;
+ }
+ emitSeg(pts, off, type);
}
- output.lineTo(x1, y1);
} else {
- if (starting) {
- firstDashOn = false;
- starting = false;
- }
- output.moveTo(x1, y1);
+ starting = false;
+ needsMoveTo = true;
}
- this.x0 = x1;
- this.y0 = y1;
+ this.x0 = x;
+ this.y0 = y;
}
public void lineTo(float x1, float y1) {
- // The widened line is squished to a 0 width one, so no drawing is done
- if (det == 0) {
- goTo(x1, y1);
- return;
- }
float dx = x1 - x0;
float dy = y1 - y0;
-
- // Compute segment length in the untransformed
- // coordinate system
+ float len = (float) Math.hypot(dx, dy);
- float la = (dy*m00 - dx*m10)/det;
- float lb = (dy*m01 - dx*m11)/det;
- float origLen = (float) Math.hypot(la, lb);
-
- if (origLen == 0) {
- // Let the output LineSink deal with cases where dx, dy are 0.
- goTo(x1, y1);
+ if (len == 0) {
return;
}
// The scaling factors needed to get the dx and dy of the
// transformed dash segments.
- float cx = dx / origLen;
- float cy = dy / origLen;
+ float cx = dx / len;
+ float cy = dy / len;
while (true) {
float leftInThisDashSegment = dash[idx] - phase;
- if (origLen < leftInThisDashSegment) {
- goTo(x1, y1);
+ if (len <= leftInThisDashSegment) {
+ curCurvepts[0] = x1;
+ curCurvepts[1] = y1;
+ goTo(curCurvepts, 0, 4);
// Advance phase within current dash segment
- phase += origLen;
- return;
- } else if (origLen == leftInThisDashSegment) {
- goTo(x1, y1);
- phase = 0f;
- idx = (idx + 1) % dash.length;
- dashOn = !dashOn;
+ phase += len;
+ if (len == leftInThisDashSegment) {
+ phase = 0f;
+ idx = (idx + 1) % dash.length;
+ dashOn = !dashOn;
+ }
return;
}
- float dashx, dashy;
float dashdx = dash[idx] * cx;
float dashdy = dash[idx] * cy;
if (phase == 0) {
- dashx = x0 + dashdx;
- dashy = y0 + dashdy;
+ curCurvepts[0] = x0 + dashdx;
+ curCurvepts[1] = y0 + dashdy;
} else {
- float p = (leftInThisDashSegment) / dash[idx];
- dashx = x0 + p * dashdx;
- dashy = y0 + p * dashdy;
+ float p = leftInThisDashSegment / dash[idx];
+ curCurvepts[0] = x0 + p * dashdx;
+ curCurvepts[1] = y0 + p * dashdy;
}
- goTo(dashx, dashy);
+ goTo(curCurvepts, 0, 4);
- origLen -= (dash[idx] - phase);
+ len -= leftInThisDashSegment;
// Advance to next dash segment
idx = (idx + 1) % dash.length;
dashOn = !dashOn;
@@ -199,15 +217,289 @@
}
}
+ private LengthIterator li = null;
- public void close() {
- lineTo(sx, sy);
- if (firstDashOn) {
- output.lineTo(sx1, sy1);
+ // preconditions: curCurvepts must be an array of length at least 2 * type,
+ // that contains the curve we want to dash in the first type elements
+ private void somethingTo(int type) {
+ if (pointCurve(curCurvepts, type)) {
+ return;
+ }
+ if (li == null) {
+ li = new LengthIterator(4, 0.0001f);
+ }
+ li.initializeIterationOnCurve(curCurvepts, type);
+
+ int curCurveoff = 0; // initially the current curve is at curCurvepts[0...type]
+ float lastSplitT = 0;
+ float t = 0;
+ float leftInThisDashSegment = dash[idx] - phase;
+ while ((t = li.next(leftInThisDashSegment)) < 1) {
+ if (t != 0) {
+ Helpers.subdivideAt((t - lastSplitT) / (1 - lastSplitT),
+ curCurvepts, curCurveoff,
+ curCurvepts, 0,
+ curCurvepts, type, type);
+ lastSplitT = t;
+ goTo(curCurvepts, 2, type);
+ curCurveoff = type;
+ }
+ // Advance to next dash segment
+ idx = (idx + 1) % dash.length;
+ dashOn = !dashOn;
+ phase = 0;
+ leftInThisDashSegment = dash[idx];
+ }
+ goTo(curCurvepts, curCurveoff+2, type);
+ phase += li.lastSegLen();
+ if (phase >= dash[idx]) {
+ phase = 0f;
+ idx = (idx + 1) % dash.length;
+ dashOn = !dashOn;
}
}
- public void end() {
- output.end();
+ private static boolean pointCurve(float[] curve, int type) {
+ for (int i = 2; i < type; i++) {
+ if (curve[i] != curve[i-2]) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ // Objects of this class are used to iterate through curves. They return
+ // t values where the left side of the curve has a specified length.
+ // It does this by subdividing the input curve until a certain error
+ // condition has been met. A recursive subdivision procedure would
+ // return as many as 1<<limit curves, but this is an iterator and we
+ // don't need all the curves all at once, so what we carry out a
+ // lazy inorder traversal of the recursion tree (meaning we only move
+ // through the tree when we need the next subdivided curve). This saves
+ // us a lot of memory because at any one time we only need to store
+ // limit+1 curves - one for each level of the tree + 1.
+ // NOTE: the way we do things here is not enough to traverse a general
+ // tree; however, the trees we are interested in have the property that
+ // every non leaf node has exactly 2 children
+ private static class LengthIterator {
+ private enum Side {LEFT, RIGHT};
+ // Holds the curves at various levels of the recursion. The root
+ // (i.e. the original curve) is at recCurveStack[0] (but then it
+ // gets subdivided, the left half is put at 1, so most of the time
+ // only the right half of the original curve is at 0)
+ private float[][] recCurveStack;
+ // sides[i] indicates whether the node at level i+1 in the path from
+ // the root to the current leaf is a left or right child of its parent.
+ private Side[] sides;
+ private int curveType;
+ private final int limit;
+ private final float ERR;
+ private final float minTincrement;
+ // lastT and nextT delimit the current leaf.
+ private float nextT;
+ private float lenAtNextT;
+ private float lastT;
+ private float lenAtLastT;
+ private float lenAtLastSplit;
+ private float lastSegLen;
+ // the current level in the recursion tree. 0 is the root. limit
+ // is the deepest possible leaf.
+ private int recLevel;
+ private boolean done;
+
+ public LengthIterator(int reclimit, float err) {
+ this.limit = reclimit;
+ this.minTincrement = 1f / (1 << limit);
+ this.ERR = err;
+ this.recCurveStack = new float[reclimit+1][8];
+ this.sides = new Side[reclimit];
+ // if any methods are called without first initializing this object on
+ // a curve, we want it to fail ASAP.
+ this.nextT = Float.MAX_VALUE;
+ this.lenAtNextT = Float.MAX_VALUE;
+ this.lenAtLastSplit = Float.MIN_VALUE;
+ this.recLevel = Integer.MIN_VALUE;
+ this.lastSegLen = Float.MAX_VALUE;
+ this.done = true;
+ }
+
+ public void initializeIterationOnCurve(float[] pts, int type) {
+ System.arraycopy(pts, 0, recCurveStack[0], 0, type);
+ this.curveType = type;
+ this.recLevel = 0;
+ this.lastT = 0;
+ this.lenAtLastT = 0;
+ this.nextT = 0;
+ this.lenAtNextT = 0;
+ goLeft(); // initializes nextT and lenAtNextT properly
+ this.lenAtLastSplit = 0;
+ if (recLevel > 0) {
+ this.sides[0] = Side.LEFT;
+ this.done = false;
+ } else {
+ // the root of the tree is a leaf so we're done.
+ this.sides[0] = Side.RIGHT;
+ this.done = true;
+ }
+ this.lastSegLen = 0;
+ }
+
+ // returns the t value where the remaining curve should be split in
+ // order for the left subdivided curve to have length len. If len
+ // is >= than the length of the uniterated curve, it returns 1.
+ public float next(float len) {
+ float targetLength = lenAtLastSplit + len;
+ while(lenAtNextT < targetLength) {
+ if (done) {
+ lastSegLen = lenAtNextT - lenAtLastSplit;
+ return 1;
+ }
+ goToNextLeaf();
+ }
+ lenAtLastSplit = targetLength;
+ float t = binSearchForLen(lenAtLastSplit - lenAtLastT,
+ recCurveStack[recLevel], curveType, lenAtNextT - lenAtLastT, ERR);
+ // t is relative to the current leaf, so we must make it a valid parameter
+ // of the original curve.
+ t = t * (nextT - lastT) + lastT;
+ if (t >= 1) {
+ t = 1;
+ done = true;
+ }
+ // even if done = true, if we're here, that means targetLength
+ // is equal to, or very, very close to the total length of the
+ // curve, so lastSegLen won't be too high. In cases where len
+ // overshoots the curve, this method will exit in the while
+ // loop, and lastSegLen will still be set to the right value.
+ lastSegLen = len;
+ return t;
+ }
+
+ public float lastSegLen() {
+ return lastSegLen;
+ }
+
+ // Returns t such that if leaf is subdivided at t the left
+ // curve will have length len. leafLen must be the length of leaf.
+ private static Curve bsc = new Curve();
+ private static float binSearchForLen(float len, float[] leaf, int type,
+ float leafLen, float err)
+ {
+ assert len <= leafLen;
+ bsc.set(leaf, type);
+ float errBound = err*len;
+ float left = 0, right = 1;
+ while (left < right) {
+ float m = (left + right) / 2;
+ if (m == left || m == right) {
+ return m;
+ }
+ float x = bsc.xat(m);
+ float y = bsc.yat(m);
+ float leftLen = Helpers.linelen(leaf[0], leaf[1], x, y);
+ if (Math.abs(leftLen - len) < errBound) {
+ return m;
+ }
+ if (leftLen < len) {
+ left = m;
+ } else {
+ right = m;
+ }
+ }
+ return left;
+ }
+
+ // go to the next leaf (in an inorder traversal) in the recursion tree
+ // preconditions: must be on a leaf, and that leaf must not be the root.
+ private void goToNextLeaf() {
+ // We must go to the first ancestor node that has an unvisited
+ // right child.
+ recLevel--;
+ while(sides[recLevel] == Side.RIGHT) {
+ if (recLevel == 0) {
+ done = true;
+ return;
+ }
+ recLevel--;
+ }
+
+ sides[recLevel] = Side.RIGHT;
+ System.arraycopy(recCurveStack[recLevel], 0, recCurveStack[recLevel+1], 0, curveType);
+ recLevel++;
+ goLeft();
+ }
+
+ // go to the leftmost node from the current node. Return its length.
+ private void goLeft() {
+ float len = onLeaf();
+ if (len >= 0) {
+ lastT = nextT;
+ lenAtLastT = lenAtNextT;
+ nextT += (1 << (limit - recLevel)) * minTincrement;
+ lenAtNextT += len;
+ } else {
+ Helpers.subdivide(recCurveStack[recLevel], 0,
+ recCurveStack[recLevel+1], 0,
+ recCurveStack[recLevel], 0, curveType);
+ sides[recLevel] = Side.LEFT;
+ recLevel++;
+ goLeft();
+ }
+ }
+
+ // this is a bit of a hack. It returns -1 if we're not on a leaf, and
+ // the length of the leaf if we are on a leaf.
+ private float onLeaf() {
+ float polylen = Helpers.polyLineLength(recCurveStack[recLevel], 0, curveType);
+ float linelen = Helpers.linelen(recCurveStack[recLevel][0], recCurveStack[recLevel][1],
+ recCurveStack[recLevel][curveType - 2], recCurveStack[recLevel][curveType - 1]);
+ return (polylen - linelen < ERR || recLevel == limit) ?
+ (polylen + linelen)/2 : -1;
+ }
+ }
+
+ @Override
+ public void curveTo(float x1, float y1,
+ float x2, float y2,
+ float x3, float y3)
+ {
+ curCurvepts[0] = x0; curCurvepts[1] = y0;
+ curCurvepts[2] = x1; curCurvepts[3] = y1;
+ curCurvepts[4] = x2; curCurvepts[5] = y2;
+ curCurvepts[6] = x3; curCurvepts[7] = y3;
+ somethingTo(8);
+ }
+
+ @Override
+ public void quadTo(float x1, float y1, float x2, float y2) {
+ curCurvepts[0] = x0; curCurvepts[1] = y0;
+ curCurvepts[2] = x1; curCurvepts[3] = y1;
+ curCurvepts[4] = x2; curCurvepts[5] = y2;
+ somethingTo(6);
+ }
+
+ public void closePath() {
+ lineTo(sx, sy);
+ if (firstSegidx > 0) {
+ if (!dashOn || needsMoveTo) {
+ out.moveTo(sx, sy);
+ }
+ emitFirstSegments();
+ }
+ moveTo(sx, sy);
+ }
+
+ public void pathDone() {
+ if (firstSegidx > 0) {
+ out.moveTo(sx, sy);
+ emitFirstSegments();
+ }
+ out.pathDone();
+ }
+
+ @Override
+ public long getNativeConsumer() {
+ throw new InternalError("Dasher does not use a native consumer");
}
}
+