Hi Denis,
I took a little break from code reviewing to write up this concept which
might help simplify the PolyIOHelper stuff in your code (later). My
concept was that the attached "transforming PathConsumer" classes would
be potentially more efficient than putting the coordinates into a buffer
and then calling a method on AffineTransform. With the PolyIOHelper
stuff we have the following flow:
src calls pc.fooTo()
pc calls io.readFoo()
io stores to buffer
conditionally:
io calls at.transform()
at loads values
at computes values
at stores values
With these classes, if there is a transform:
src calls tpc.fooTo(x,y)
tpc computes values
tpc calls pc.fooTo(x',y')
pc stores to buffer as needed
And if the transform was null or identity:
src calls pc.fooTo()
pc stores to buffer as needed
And something similar on the output. The buffering is then entirely at
the discretion of the eventual consumer (Dasher/Stroker) and the
information flow is more direct whether or not there is a transform.
There are optimal "TPC" implementations of translate, scale+translate,
and full transform. AT further optimizes the cases of scale without
translate and shears without scales (and/or translates), but I don't
think those cases happen often enough to worry about spending too much
to optimize, especially since these classes already win by inlining the
transform calculations...?
Note that these compile, but I haven't tested them (the implementation
was pretty straightforward, though)...
...jim
/*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.java2d.pisces;
import sun.awt.geom.PathConsumer2D;
import java.awt.geom.AffineTransform;
public class TransformingPathConsumer2D {
public static PathConsumer2D
transformConsumer(PathConsumer2D out,
AffineTransform at)
{
if (at == null) {
return out;
}
float Mxx = (float) at.getScaleX();
float Mxy = (float) at.getShearX();
float Mxt = (float) at.getTranslateX();
float Myx = (float) at.getShearY();
float Myy = (float) at.getScaleY();
float Myt = (float) at.getTranslateY();
if (Mxy == 0f && Myx == 0f) {
if (Mxx == 1f && Myy == 1f) {
if (Mxt == 0f && Myt == 0f) {
return out;
} else {
return new TranslateFilter(out, Mxt, Myt);
}
} else {
return new ScaleFilter(out, Mxx, Myy, Mxt, Myt);
}
} else {
return new TransformFilter(out, Mxx, Mxy, Mxt, Myx, Myy, Myt);
}
}
static class TranslateFilter implements PathConsumer2D {
PathConsumer2D out;
float tx;
float ty;
TranslateFilter(PathConsumer2D out,
float tx, float ty)
{
this.out = out;
this.tx = tx;
this.ty = ty;
}
public void moveTo(float x0, float y0) {
out.moveTo(x0 + tx, y0 + ty);
}
public void lineTo(float x1, float y1) {
out.lineTo(x1 + tx, y1 + ty);
}
public void quadTo(float x1, float y1,
float x2, float y2)
{
out.quadTo(x1 + tx, y1 + ty,
x2 + tx, y2 + ty);
}
public void curveTo(float x1, float y1,
float x2, float y2,
float x3, float y3)
{
out.curveTo(x1 + tx, y1 + ty,
x2 + tx, y2 + ty,
x3 + tx, y3 + ty);
}
public void closePath() {
out.closePath();
}
public void pathDone() {
out.pathDone();
}
public long getNativeConsumer() {
return 0;
}
}
static class ScaleFilter implements PathConsumer2D {
PathConsumer2D out;
float sx;
float sy;
float tx;
float ty;
ScaleFilter(PathConsumer2D out,
float sx, float sy, float tx, float ty)
{
this.out = out;
this.sx = sx;
this.sy = sy;
this.tx = tx;
this.ty = ty;
}
public void moveTo(float x0, float y0) {
out.moveTo(x0 * sx + tx, y0 * sy + ty);
}
public void lineTo(float x1, float y1) {
out.lineTo(x1 * sx + tx, y1 * sy + ty);
}
public void quadTo(float x1, float y1,
float x2, float y2)
{
out.quadTo(x1 * sx + tx, y1 * sy + ty,
x2 * sx + tx, y2 * sy + ty);
}
public void curveTo(float x1, float y1,
float x2, float y2,
float x3, float y3)
{
out.curveTo(x1 * sx + tx, y1 * sy + ty,
x2 * sx + tx, y2 * sy + ty,
x3 * sx + tx, y3 * sy + ty);
}
public void closePath() {
out.closePath();
}
public void pathDone() {
out.pathDone();
}
public long getNativeConsumer() {
return 0;
}
}
static class TransformFilter implements PathConsumer2D {
PathConsumer2D out;
float Mxx;
float Mxy;
float Mxt;
float Myx;
float Myy;
float Myt;
TransformFilter(PathConsumer2D out,
float Mxx, float Mxy, float Mxt,
float Myx, float Myy, float Myt)
{
this.out = out;
this.Mxx = Mxx;
this.Mxy = Mxy;
this.Mxt = Mxt;
this.Myx = Myx;
this.Myy = Myy;
this.Myt = Myt;
}
public void moveTo(float x0, float y0) {
out.moveTo(x0 * Mxx + y0 * Mxy + Mxt,
x0 * Myx + y0 * Myy + Myt);
}
public void lineTo(float x1, float y1) {
out.lineTo(x1 * Mxx + y1 * Mxy + Mxt,
x1 * Myx + y1 * Myy + Myt);
}
public void quadTo(float x1, float y1,
float x2, float y2)
{
out.quadTo(x1 * Mxx + y1 * Mxy + Mxt,
x1 * Myx + y1 * Myy + Myt,
x2 * Mxx + y2 * Mxy + Mxt,
x2 * Myx + y2 * Myy + Myt);
}
public void curveTo(float x1, float y1,
float x2, float y2,
float x3, float y3)
{
out.curveTo(x1 * Mxx + y1 * Mxy + Mxt,
x1 * Myx + y1 * Myy + Myt,
x2 * Mxx + y2 * Mxy + Mxt,
x2 * Myx + y2 * Myy + Myt,
x3 * Mxx + y3 * Mxy + Mxt,
x3 * Myx + y3 * Myy + Myt);
}
public void closePath() {
out.closePath();
}
public void pathDone() {
out.pathDone();
}
public long getNativeConsumer() {
return 0;
}
}
}
