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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java | 2176 |
1 files changed, 2176 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java b/libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java new file mode 100644 index 000000000..05d35c573 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/peer/gtk/CairoGraphics2D.java @@ -0,0 +1,2176 @@ +/* CairoGraphics2D.java -- + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.peer.gtk; + +import gnu.classpath.Configuration; + +import gnu.java.awt.ClasspathToolkit; + +import java.awt.AWTPermission; +import java.awt.AlphaComposite; +import java.awt.BasicStroke; +import java.awt.Color; +import java.awt.Composite; +import java.awt.CompositeContext; +import java.awt.Font; +import java.awt.FontMetrics; +import java.awt.GradientPaint; +import java.awt.Graphics; +import java.awt.Graphics2D; +import java.awt.GraphicsConfiguration; +import java.awt.Image; +import java.awt.Paint; +import java.awt.PaintContext; +import java.awt.Point; +import java.awt.Polygon; +import java.awt.Rectangle; +import java.awt.RenderingHints; +import java.awt.Shape; +import java.awt.Stroke; +import java.awt.TexturePaint; +import java.awt.Toolkit; +import java.awt.font.FontRenderContext; +import java.awt.font.GlyphVector; +import java.awt.font.TextLayout; +import java.awt.geom.AffineTransform; +import java.awt.geom.Arc2D; +import java.awt.geom.Area; +import java.awt.geom.Ellipse2D; +import java.awt.geom.GeneralPath; +import java.awt.geom.Line2D; +import java.awt.geom.NoninvertibleTransformException; +import java.awt.geom.PathIterator; +import java.awt.geom.Point2D; +import java.awt.geom.Rectangle2D; +import java.awt.geom.RoundRectangle2D; +import java.awt.image.AffineTransformOp; +import java.awt.image.BufferedImage; +import java.awt.image.BufferedImageOp; +import java.awt.image.ColorModel; +import java.awt.image.DataBuffer; +import java.awt.image.DataBufferInt; +import java.awt.image.DirectColorModel; +import java.awt.image.ImageObserver; +import java.awt.image.ImageProducer; +import java.awt.image.ImagingOpException; +import java.awt.image.MultiPixelPackedSampleModel; +import java.awt.image.Raster; +import java.awt.image.RenderedImage; +import java.awt.image.SampleModel; +import java.awt.image.WritableRaster; +import java.awt.image.renderable.RenderContext; +import java.awt.image.renderable.RenderableImage; +import java.text.AttributedCharacterIterator; +import java.util.HashMap; +import java.util.Map; + +/** + * This is an abstract implementation of Graphics2D on Cairo. + * + * It should be subclassed for different Cairo contexts. + * + * Note for subclassers: Apart from the constructor (see comments below), + * The following abstract methods must be implemented: + * + * Graphics create() + * GraphicsConfiguration getDeviceConfiguration() + * copyArea(int x, int y, int width, int height, int dx, int dy) + * + * Also, dispose() must be overloaded to free any native datastructures + * used by subclass and in addition call super.dispose() to free the + * native cairographics2d structure and cairo_t. + * + * @author Sven de Marothy + */ +public abstract class CairoGraphics2D extends Graphics2D +{ + static + { + if (true) // GCJ LOCAL + { + System.loadLibrary("gtkpeer"); + } + } + + /** + * Important: This is a pointer to the native cairographics2d structure + * + * DO NOT CHANGE WITHOUT CHANGING NATIVE CODE. + */ + long nativePointer; + + // Drawing state variables + /** + * The current paint + */ + Paint paint; + boolean customPaint; + + /** + * The current stroke + */ + Stroke stroke; + + /* + * Current foreground and background color. + */ + Color fg, bg; + + /** + * Current clip shape. + */ + Shape clip; + + /** + * Current transform. + */ + AffineTransform transform; + + /** + * Current font. + */ + Font font; + + /** + * The current compositing context, if any. + */ + Composite comp; + CompositeContext compCtx; + + /** + * Rendering hint map. + */ + private RenderingHints hints; + + /** + * Status of the anti-alias flag in cairo. + */ + private boolean antialias = false; + private boolean ignoreAA = false; + + /** + * Some operations (drawing rather than filling) require that their + * coords be shifted to land on 0.5-pixel boundaries, in order to land on + * "middle of pixel" coordinates and light up complete pixels. + */ + protected boolean shiftDrawCalls = false; + + /** + * Keep track if the first clip to be set, which is restored on setClip(null); + */ + private boolean firstClip = true; + private Shape originalClip; + + /** + * Stroke used for 3DRects + */ + private static BasicStroke draw3DRectStroke = new BasicStroke(); + + static ColorModel rgb32 = new DirectColorModel(32, 0xFF0000, 0xFF00, 0xFF); + static ColorModel argb32 = new DirectColorModel(32, 0xFF0000, 0xFF00, 0xFF, + 0xFF000000); + + /** + * Native constants for interpolation methods. + * Note, this corresponds to an enum in native/jni/gtk-peer/cairographics2d.h + */ + public static final int INTERPOLATION_NEAREST = 0, + INTERPOLATION_BILINEAR = 1, + INTERPOLATION_BICUBIC = 5, + ALPHA_INTERPOLATION_SPEED = 2, + ALPHA_INTERPOLATION_QUALITY = 3, + ALPHA_INTERPOLATION_DEFAULT = 4; + // TODO: Does ALPHA_INTERPOLATION really correspond to CAIRO_FILTER_FAST/BEST/GOOD? + + /** + * Constructor does nothing. + */ + public CairoGraphics2D() + { + } + + /** + * Sets up the default values and allocates the native cairographics2d structure + * @param cairo_t_pointer a native pointer to a cairo_t of the context. + */ + public void setup(long cairo_t_pointer) + { + nativePointer = init(cairo_t_pointer); + setRenderingHints(new RenderingHints(getDefaultHints())); + setFont(new Font("SansSerif", Font.PLAIN, 12)); + setColor(Color.black); + setBackground(Color.white); + setPaint(Color.black); + setStroke(new BasicStroke()); + setTransform(new AffineTransform()); + cairoSetAntialias(nativePointer, antialias); + } + + /** + * Same as above, but copies the state of another CairoGraphics2D. + */ + public void copy(CairoGraphics2D g, long cairo_t_pointer) + { + nativePointer = init(cairo_t_pointer); + paint = g.paint; + stroke = g.stroke; + setRenderingHints(g.hints); + + Color foreground; + + if (g.fg.getAlpha() != -1) + foreground = new Color(g.fg.getRed(), g.fg.getGreen(), g.fg.getBlue(), + g.fg.getAlpha()); + else + foreground = new Color(g.fg.getRGB()); + + if (g.bg != null) + { + if (g.bg.getAlpha() != -1) + bg = new Color(g.bg.getRed(), g.bg.getGreen(), g.bg.getBlue(), + g.bg.getAlpha()); + else + bg = new Color(g.bg.getRGB()); + } + + firstClip = g.firstClip; + originalClip = g.originalClip; + clip = g.getClip(); + + if (g.transform == null) + transform = null; + else + transform = new AffineTransform(g.transform); + + setFont(g.font); + setColor(foreground); + setBackground(bg); + setPaint(paint); + setStroke(stroke); + setTransformImpl(transform); + setClip(clip); + setComposite(comp); + + antialias = !g.antialias; + setAntialias(g.antialias); + } + + /** + * Generic destructor - call the native dispose() method. + */ + public void finalize() + { + dispose(); + } + + /** + * Disposes the native cairographics2d structure, including the + * cairo_t and any gradient stuff, if allocated. + * Subclasses should of course overload and call this if + * they have additional native structures. + */ + public void dispose() + { + disposeNative(nativePointer); + nativePointer = 0; + if (compCtx != null) + compCtx.dispose(); + } + + /** + * Allocate the cairographics2d structure and set the cairo_t pointer in it. + * @param pointer - a cairo_t pointer, casted to a long. + */ + protected native long init(long pointer); + + /** + * These are declared abstract as there may be context-specific issues. + */ + public abstract Graphics create(); + + public abstract GraphicsConfiguration getDeviceConfiguration(); + + protected abstract void copyAreaImpl(int x, int y, int width, int height, + int dx, int dy); + + + /** + * Find the bounds of this graphics context, in device space. + * + * @return the bounds in device-space + */ + protected abstract Rectangle2D getRealBounds(); + + ////// Native Methods //////////////////////////////////////////////////// + + /** + * Dispose of allocate native resouces. + */ + public native void disposeNative(long pointer); + + /** + * Draw pixels as an RGBA int matrix + * @param w - width + * @param h - height + * @param stride - stride of the array width + * @param i2u - affine transform array + */ + protected native void drawPixels(long pointer, int[] pixels, int w, int h, + int stride, double[] i2u, double alpha, + int interpolation); + + protected native void setGradient(long pointer, double x1, double y1, + double x2, double y2, + int r1, int g1, int b1, int a1, int r2, + int g2, int b2, int a2, boolean cyclic); + + protected native void setPaintPixels(long pointer, int[] pixels, int w, + int h, int stride, boolean repeat, + int x, int y); + + /** + * Set the current transform matrix + */ + protected native void cairoSetMatrix(long pointer, double[] m); + + /** + * Scaling method + */ + protected native void cairoScale(long pointer, double x, double y); + + /** + * Set the compositing operator + */ + protected native void cairoSetOperator(long pointer, int cairoOperator); + + /** + * Sets the current color in RGBA as a 0.0-1.0 double + */ + protected native void cairoSetRGBAColor(long pointer, double red, double green, + double blue, double alpha); + + /** + * Sets the current winding rule in Cairo + */ + protected native void cairoSetFillRule(long pointer, int cairoFillRule); + + /** + * Set the line style, cap, join and miter limit. + * Cap and join parameters are in the BasicStroke enumerations. + */ + protected native void cairoSetLine(long pointer, double width, int cap, + int join, double miterLimit); + + /** + * Set the dash style + */ + protected native void cairoSetDash(long pointer, double[] dashes, int ndash, + double offset); + + /* + * Draws a Glyph Vector + */ + protected native void cairoDrawGlyphVector(long pointer, GdkFontPeer font, + float x, float y, int n, + int[] codes, float[] positions, long[] fontset); + + /** + * Set the font in cairo. + */ + protected native void cairoSetFont(long pointer, GdkFontPeer font); + + /** + * Appends a rectangle to the current path + */ + protected native void cairoRectangle(long pointer, double x, double y, + double width, double height); + + /** + * Appends an arc to the current path + */ + protected native void cairoArc(long pointer, double x, double y, + double radius, double angle1, double angle2); + + /** + * Save / restore a cairo path + */ + protected native void cairoSave(long pointer); + protected native void cairoRestore(long pointer); + + /** + * New current path + */ + protected native void cairoNewPath(long pointer); + + /** + * Close current path + */ + protected native void cairoClosePath(long pointer); + + /** moveTo */ + protected native void cairoMoveTo(long pointer, double x, double y); + + /** lineTo */ + protected native void cairoLineTo(long pointer, double x, double y); + + /** Cubic curve-to */ + protected native void cairoCurveTo(long pointer, double x1, double y1, + double x2, double y2, + double x3, double y3); + + /** + * Stroke current path + */ + protected native void cairoStroke(long pointer); + + /** + * Fill current path + */ + protected native void cairoFill(long pointer, double alpha); + + /** + * Clip current path + */ + protected native void cairoClip(long pointer); + + /** + * Clear clip + */ + protected native void cairoResetClip(long pointer); + + /** + * Set antialias. + */ + protected native void cairoSetAntialias(long pointer, boolean aa); + + + ///////////////////////// TRANSFORMS /////////////////////////////////// + /** + * Set the current transform + */ + public void setTransform(AffineTransform tx) + { + // Transform clip into target space using the old transform. + updateClip(transform); + + // Update the native transform. + setTransformImpl(tx); + + // Transform the clip back into user space using the inverse new transform. + try + { + updateClip(transform.createInverse()); + } + catch (NoninvertibleTransformException ex) + { + // TODO: How can we deal properly with this? + ex.printStackTrace(); + } + + if (clip != null) + setClip(clip); + } + + private void setTransformImpl(AffineTransform tx) + { + transform = tx; + if (transform != null) + { + double[] m = new double[6]; + transform.getMatrix(m); + cairoSetMatrix(nativePointer, m); + } + } + + public void transform(AffineTransform tx) + { + if (transform == null) + transform = new AffineTransform(tx); + else + transform.concatenate(tx); + + if (clip != null) + { + try + { + AffineTransform clipTransform = tx.createInverse(); + updateClip(clipTransform); + } + catch (NoninvertibleTransformException ex) + { + // TODO: How can we deal properly with this? + ex.printStackTrace(); + } + } + + setTransformImpl(transform); + } + + public void rotate(double theta) + { + transform(AffineTransform.getRotateInstance(theta)); + } + + public void rotate(double theta, double x, double y) + { + transform(AffineTransform.getRotateInstance(theta, x, y)); + } + + public void scale(double sx, double sy) + { + transform(AffineTransform.getScaleInstance(sx, sy)); + } + + /** + * Translate the system of the co-ordinates. As translation is a frequent + * operation, it is done in an optimised way, unlike scaling and rotating. + */ + public void translate(double tx, double ty) + { + if (transform != null) + transform.translate(tx, ty); + else + transform = AffineTransform.getTranslateInstance(tx, ty); + + if (clip != null) + { + // FIXME: this should actuall try to transform the shape + // rather than degrade to bounds. + if (clip instanceof Rectangle2D) + { + Rectangle2D r = (Rectangle2D) clip; + r.setRect(r.getX() - tx, r.getY() - ty, r.getWidth(), + r.getHeight()); + } + else + { + AffineTransform clipTransform = + AffineTransform.getTranslateInstance(-tx, -ty); + updateClip(clipTransform); + } + } + + setTransformImpl(transform); + } + + public void translate(int x, int y) + { + translate((double) x, (double) y); + } + + public void shear(double shearX, double shearY) + { + transform(AffineTransform.getShearInstance(shearX, shearY)); + } + + ///////////////////////// DRAWING STATE /////////////////////////////////// + + public void clip(Shape s) + { + // Do not touch clip when s == null. + if (s == null) + { + // The spec says this should clear the clip. The reference + // implementation throws a NullPointerException instead. I think, + // in this case we should conform to the specs, as it shouldn't + // affect compatibility. + setClip(null); + return; + } + + // If the current clip is still null, initialize it. + if (clip == null) + { + clip = getRealBounds(); + } + + // This is so common, let's optimize this. + if (clip instanceof Rectangle2D && s instanceof Rectangle2D) + { + Rectangle2D clipRect = (Rectangle2D) clip; + Rectangle2D r = (Rectangle2D) s; + Rectangle2D.intersect(clipRect, r, clipRect); + setClip(clipRect); + } + else + { + Area current; + if (clip instanceof Area) + current = (Area) clip; + else + current = new Area(clip); + + Area intersect; + if (s instanceof Area) + intersect = (Area) s; + else + intersect = new Area(s); + + current.intersect(intersect); + clip = current; + // Call setClip so that the native side gets notified. + setClip(clip); + } + } + + public Paint getPaint() + { + return paint; + } + + public AffineTransform getTransform() + { + return (AffineTransform) transform.clone(); + } + + public void setPaint(Paint p) + { + if (p == null) + return; + + paint = p; + if (paint instanceof Color) + { + setColor((Color) paint); + customPaint = false; + } + + else if (paint instanceof TexturePaint) + { + TexturePaint tp = (TexturePaint) paint; + BufferedImage img = tp.getImage(); + + // map the image to the anchor rectangle + int width = (int) tp.getAnchorRect().getWidth(); + int height = (int) tp.getAnchorRect().getHeight(); + + double scaleX = width / (double) img.getWidth(); + double scaleY = height / (double) img.getHeight(); + + AffineTransform at = new AffineTransform(scaleX, 0, 0, scaleY, 0, 0); + AffineTransformOp op = new AffineTransformOp(at, getRenderingHints()); + BufferedImage texture = op.filter(img, null); + int[] pixels = texture.getRGB(0, 0, width, height, null, 0, width); + setPaintPixels(nativePointer, pixels, width, height, width, true, 0, 0); + customPaint = false; + } + + else if (paint instanceof GradientPaint) + { + GradientPaint gp = (GradientPaint) paint; + Point2D p1 = gp.getPoint1(); + Point2D p2 = gp.getPoint2(); + Color c1 = gp.getColor1(); + Color c2 = gp.getColor2(); + setGradient(nativePointer, p1.getX(), p1.getY(), p2.getX(), p2.getY(), + c1.getRed(), c1.getGreen(), c1.getBlue(), c1.getAlpha(), + c2.getRed(), c2.getGreen(), c2.getBlue(), c2.getAlpha(), + gp.isCyclic()); + customPaint = false; + } + else + { + customPaint = true; + } + } + + /** + * Sets a custom paint + * + * @param bounds the bounding box, in user space + */ + protected void setCustomPaint(Rectangle bounds) + { + if (paint instanceof Color || paint instanceof TexturePaint + || paint instanceof GradientPaint) + return; + + int userX = bounds.x; + int userY = bounds.y; + int userWidth = bounds.width; + int userHeight = bounds.height; + + // Find bounds in device space + Rectangle2D bounds2D = getTransformedBounds(bounds, transform); + int deviceX = (int)bounds2D.getX(); + int deviceY = (int)bounds2D.getY(); + int deviceWidth = (int)Math.ceil(bounds2D.getWidth()); + int deviceHeight = (int)Math.ceil(bounds2D.getHeight()); + + // Get raster of the paint background + PaintContext pc = paint.createContext(CairoSurface.cairoColorModel, + new Rectangle(deviceX, deviceY, + deviceWidth, + deviceHeight), + bounds, + transform, hints); + + Raster raster = pc.getRaster(deviceX, deviceY, deviceWidth, + deviceHeight); + + // Clear the transform matrix in Cairo, since the raster returned by the + // PaintContext is already in device-space + AffineTransform oldTx = new AffineTransform(transform); + setTransformImpl(new AffineTransform()); + + // Set pixels in cairo, aligning the top-left of the background image + // to the top-left corner in device space + if (pc.getColorModel().equals(CairoSurface.cairoColorModel) + && raster.getSampleModel().getTransferType() == DataBuffer.TYPE_INT) + { + // Use a fast copy if the paint context can uses a Cairo-compatible + // color model + setPaintPixels(nativePointer, + (int[])raster.getDataElements(0, 0, deviceWidth, + deviceHeight, null), + deviceWidth, deviceHeight, deviceWidth, false, + deviceX, deviceY); + } + + else if (pc.getColorModel().equals(CairoSurface.cairoCM_opaque) + && raster.getSampleModel().getTransferType() == DataBuffer.TYPE_INT) + { + // We can also optimize if the context uses a similar color model + // but without an alpha channel; we just add the alpha + int[] pixels = (int[])raster.getDataElements(0, 0, deviceWidth, + deviceHeight, null); + + for (int i = 0; i < pixels.length; i++) + pixels[i] = 0xff000000 | (pixels[i] & 0x00ffffff); + + setPaintPixels(nativePointer, pixels, deviceWidth, deviceHeight, + deviceWidth, false, deviceX, deviceY); + } + + else + { + // Fall back on wrapping the raster in a BufferedImage, and + // use BufferedImage.getRGB() to do color-model conversion + WritableRaster wr = Raster.createWritableRaster(raster.getSampleModel(), + new Point(raster.getMinX(), + raster.getMinY())); + wr.setRect(raster); + + BufferedImage img2 = new BufferedImage(pc.getColorModel(), wr, + pc.getColorModel().isAlphaPremultiplied(), + null); + + setPaintPixels(nativePointer, + img2.getRGB(0, 0, deviceWidth, deviceHeight, null, 0, + deviceWidth), + deviceWidth, deviceHeight, deviceWidth, false, + deviceX, deviceY); + } + + // Restore transform + setTransformImpl(oldTx); + } + + public Stroke getStroke() + { + return stroke; + } + + public void setStroke(Stroke st) + { + stroke = st; + if (stroke instanceof BasicStroke) + { + BasicStroke bs = (BasicStroke) stroke; + cairoSetLine(nativePointer, bs.getLineWidth(), bs.getEndCap(), + bs.getLineJoin(), bs.getMiterLimit()); + + float[] dashes = bs.getDashArray(); + if (dashes != null) + { + double[] double_dashes = new double[dashes.length]; + for (int i = 0; i < dashes.length; i++) + double_dashes[i] = dashes[i]; + + cairoSetDash(nativePointer, double_dashes, double_dashes.length, + (double) bs.getDashPhase()); + } + else + cairoSetDash(nativePointer, new double[0], 0, 0.0); + } + } + + /** + * Utility method to find the bounds of a shape, including the stroke width. + * + * @param s the shape + * @return the bounds of the shape, including stroke width + */ + protected Rectangle findStrokedBounds(Shape s) + { + Rectangle r = s.getBounds(); + + if (stroke instanceof BasicStroke) + { + int strokeWidth = (int)Math.ceil(((BasicStroke)stroke).getLineWidth()); + r.x -= strokeWidth / 2; + r.y -= strokeWidth / 2; + r.height += strokeWidth; + r.width += strokeWidth; + } + else + { + Shape s2 = stroke.createStrokedShape(s); + r = s2.getBounds(); + } + + return r; + } + + public void setPaintMode() + { + setComposite(AlphaComposite.SrcOver); + } + + public void setXORMode(Color c) + { + // FIXME: implement + } + + public void setColor(Color c) + { + if (c == null) + c = Color.BLACK; + + fg = c; + paint = c; + updateColor(); + } + + /** + * Set the current fg value as the cairo color. + */ + void updateColor() + { + if (fg == null) + fg = Color.BLACK; + + cairoSetRGBAColor(nativePointer, fg.getRed() / 255.0, + fg.getGreen() / 255.0,fg.getBlue() / 255.0, + fg.getAlpha() / 255.0); + } + + public Color getColor() + { + return fg; + } + + public void clipRect(int x, int y, int width, int height) + { + if (clip == null) + setClip(new Rectangle(x, y, width, height)); + else if (clip instanceof Rectangle) + { + computeIntersection(x, y, width, height, (Rectangle) clip); + setClip(clip); + } + else + clip(new Rectangle(x, y, width, height)); + } + + public Shape getClip() + { + if (clip == null) + return null; + else if (clip instanceof Rectangle2D) + return clip.getBounds2D(); //getClipInDevSpace(); + else + { + GeneralPath p = new GeneralPath(); + PathIterator pi = clip.getPathIterator(null); + p.append(pi, false); + return p; + } + } + + public Rectangle getClipBounds() + { + if (clip == null) + return null; + else + return clip.getBounds(); + } + + protected Rectangle2D getClipInDevSpace() + { + Rectangle2D uclip = clip.getBounds2D(); + if (transform == null) + return uclip; + else + return getTransformedBounds(clip.getBounds2D(), transform); + } + + public void setClip(int x, int y, int width, int height) + { + if( width < 0 || height < 0 ) + return; + + setClip(new Rectangle2D.Double(x, y, width, height)); + } + + public void setClip(Shape s) + { + // The first time the clip is set, save it as the original clip + // to reset to on s == null. We can rely on this being non-null + // because the constructor in subclasses is expected to set the + // initial clip properly. + if( firstClip ) + { + originalClip = s; + firstClip = false; + } + + clip = s; + cairoResetClip(nativePointer); + + if (clip != null) + { + cairoNewPath(nativePointer); + if (clip instanceof Rectangle2D) + { + Rectangle2D r = (Rectangle2D) clip; + cairoRectangle(nativePointer, r.getX(), r.getY(), r.getWidth(), + r.getHeight()); + } + else + walkPath(clip.getPathIterator(null), false); + + cairoClip(nativePointer); + } + } + + public void setBackground(Color c) + { + if (c == null) + c = Color.WHITE; + bg = c; + } + + public Color getBackground() + { + return bg; + } + + /** + * Return the current composite. + */ + public Composite getComposite() + { + if (comp == null) + return AlphaComposite.SrcOver; + else + return comp; + } + + /** + * Sets the current composite context. + */ + public void setComposite(Composite comp) + { + if (this.comp == comp) + return; + + this.comp = comp; + if (compCtx != null) + compCtx.dispose(); + compCtx = null; + + if (comp instanceof AlphaComposite) + { + AlphaComposite a = (AlphaComposite) comp; + cairoSetOperator(nativePointer, a.getRule()); + } + + else + { + cairoSetOperator(nativePointer, AlphaComposite.SRC_OVER); + + if (comp != null) + { + // FIXME: this check is only required "if this Graphics2D + // context is drawing to a Component on the display screen". + SecurityManager sm = System.getSecurityManager(); + if (sm != null) + sm.checkPermission(new AWTPermission("readDisplayPixels")); + + compCtx = comp.createContext(getBufferCM(), getNativeCM(), hints); + } + } + } + + /** + * Returns the Colour Model describing the native, raw image data for this + * specific peer. + * + * @return ColorModel the ColorModel of native data in this peer + */ + protected abstract ColorModel getNativeCM(); + + /** + * Returns the Color Model describing the buffer that this peer uses + * for custom composites. + * + * @return ColorModel the ColorModel of the composite buffer in this peer. + */ + protected ColorModel getBufferCM() + { + // This may be overridden by some subclasses + return getNativeCM(); + } + + ///////////////////////// DRAWING PRIMITIVES /////////////////////////////////// + + public void draw(Shape s) + { + if ((stroke != null && ! (stroke instanceof BasicStroke)) + || (comp instanceof AlphaComposite && ((AlphaComposite) comp).getAlpha() != 1.0)) + { + // Cairo doesn't support stroking with alpha, so we create the stroked + // shape and fill with alpha instead + fill(stroke.createStrokedShape(s)); + return; + } + + if (customPaint) + { + Rectangle r = findStrokedBounds(s); + setCustomPaint(r); + } + + setAntialias(!hints.get(RenderingHints.KEY_ANTIALIASING) + .equals(RenderingHints.VALUE_ANTIALIAS_OFF)); + createPath(s, true); + cairoStroke(nativePointer); + } + + public void fill(Shape s) + { + createPath(s, false); + + if (customPaint) + setCustomPaint(s.getBounds()); + + setAntialias(!hints.get(RenderingHints.KEY_ANTIALIASING) + .equals(RenderingHints.VALUE_ANTIALIAS_OFF)); + double alpha = 1.0; + if (comp instanceof AlphaComposite) + alpha = ((AlphaComposite) comp).getAlpha(); + cairoFill(nativePointer, alpha); + } + + private void createPath(Shape s, boolean isDraw) + { + cairoNewPath(nativePointer); + + // Optimize rectangles, since there is a direct Cairo function + if (s instanceof Rectangle2D) + { + Rectangle2D r = (Rectangle2D) s; + + // Pixels need to be shifted in draw operations to ensure that they + // light up entire pixels, but we also need to make sure the rectangle + // does not get distorted by this shifting operation + double x = shiftX(r.getX(),shiftDrawCalls && isDraw); + double y = shiftY(r.getY(), shiftDrawCalls && isDraw); + double w = Math.round(r.getWidth()); + double h = Math.round(r.getHeight()); + cairoRectangle(nativePointer, x, y, w, h); + } + + // Lines are easy too + else if (s instanceof Line2D) + { + Line2D l = (Line2D) s; + cairoMoveTo(nativePointer, shiftX(l.getX1(), shiftDrawCalls && isDraw), + shiftY(l.getY1(), shiftDrawCalls && isDraw)); + cairoLineTo(nativePointer, shiftX(l.getX2(), shiftDrawCalls && isDraw), + shiftY(l.getY2(), shiftDrawCalls && isDraw)); + } + + // We can optimize ellipses too; however we don't bother optimizing arcs: + // the iterator is fast enough (an ellipse requires 5 steps using the + // iterator, while most arcs are only 2-3) + else if (s instanceof Ellipse2D) + { + Ellipse2D e = (Ellipse2D) s; + + double radius = Math.min(e.getHeight(), e.getWidth()) / 2; + + // Cairo only draws circular shapes, but we can use a stretch to make + // them into ellipses + double xscale = 1, yscale = 1; + if (e.getHeight() != e.getWidth()) + { + cairoSave(nativePointer); + + if (e.getHeight() < e.getWidth()) + xscale = e.getWidth() / (radius * 2); + else + yscale = e.getHeight() / (radius * 2); + + if (xscale != 1 || yscale != 1) + cairoScale(nativePointer, xscale, yscale); + } + + cairoArc(nativePointer, + shiftX(e.getCenterX() / xscale, shiftDrawCalls && isDraw), + shiftY(e.getCenterY() / yscale, shiftDrawCalls && isDraw), + radius, 0, Math.PI * 2); + + if (xscale != 1 || yscale != 1) + cairoRestore(nativePointer); + } + + // All other shapes are broken down and drawn in steps using the + // PathIterator + else + walkPath(s.getPathIterator(null), shiftDrawCalls && isDraw); + } + + /** + * Note that the rest of the drawing methods go via fill() or draw() for the drawing, + * although subclasses may with to overload these methods where context-specific + * optimizations are possible (e.g. bitmaps and fillRect(int, int, int, int) + */ + + public void clearRect(int x, int y, int width, int height) + { + if (bg != null) + cairoSetRGBAColor(nativePointer, bg.getRed() / 255.0, + bg.getGreen() / 255.0, bg.getBlue() / 255.0, + bg.getAlpha() / 255.0); + + Composite oldcomp = comp; + setComposite(AlphaComposite.Src); + fillRect(x, y, width, height); + + setComposite(oldcomp); + updateColor(); + } + + public void draw3DRect(int x, int y, int width, int height, boolean raised) + { + Stroke tmp = stroke; + setStroke(draw3DRectStroke); + super.draw3DRect(x, y, width, height, raised); + setStroke(tmp); + } + + public void drawArc(int x, int y, int width, int height, int startAngle, + int arcAngle) + { + draw(new Arc2D.Double((double) x, (double) y, (double) width, + (double) height, (double) startAngle, + (double) arcAngle, Arc2D.OPEN)); + } + + public void drawLine(int x1, int y1, int x2, int y2) + { + // The coordinates being pairwise identical means one wants + // to draw a single pixel. This is emulated by drawing + // a one pixel sized rectangle. + if (x1 == x2 && y1 == y2) + fill(new Rectangle(x1, y1, 1, 1)); + else + draw(new Line2D.Double(x1, y1, x2, y2)); + } + + public void drawRect(int x, int y, int width, int height) + { + draw(new Rectangle(x, y, width, height)); + } + + public void fillArc(int x, int y, int width, int height, int startAngle, + int arcAngle) + { + fill(new Arc2D.Double((double) x, (double) y, (double) width, + (double) height, (double) startAngle, + (double) arcAngle, Arc2D.PIE)); + } + + public void fillRect(int x, int y, int width, int height) + { + fill (new Rectangle(x, y, width, height)); + } + + public void fillPolygon(int[] xPoints, int[] yPoints, int nPoints) + { + fill(new Polygon(xPoints, yPoints, nPoints)); + } + + public void drawPolygon(int[] xPoints, int[] yPoints, int nPoints) + { + draw(new Polygon(xPoints, yPoints, nPoints)); + } + + public void drawPolyline(int[] xPoints, int[] yPoints, int nPoints) + { + for (int i = 1; i < nPoints; i++) + draw(new Line2D.Double(xPoints[i - 1], yPoints[i - 1], + xPoints[i], yPoints[i])); + } + + public void drawOval(int x, int y, int width, int height) + { + drawArc(x, y, width, height, 0, 360); + } + + public void drawRoundRect(int x, int y, int width, int height, int arcWidth, + int arcHeight) + { + draw(new RoundRectangle2D.Double(x, y, width, height, arcWidth, arcHeight)); + } + + public void fillOval(int x, int y, int width, int height) + { + fillArc(x, y, width, height, 0, 360); + } + + public void fillRoundRect(int x, int y, int width, int height, int arcWidth, + int arcHeight) + { + fill(new RoundRectangle2D.Double(x, y, width, height, arcWidth, arcHeight)); + } + + /** + * CopyArea - performs clipping to the native surface as a convenience + * (requires getRealBounds). Then calls copyAreaImpl. + */ + public void copyArea(int ox, int oy, int owidth, int oheight, + int odx, int ody) + { + // FIXME: does this handle a rotation transform properly? + // (the width/height might not be correct) + Point2D pos = transform.transform(new Point2D.Double(ox, oy), + (Point2D) null); + Point2D dim = transform.transform(new Point2D.Double(ox + owidth, + oy + oheight), + (Point2D) null); + Point2D p2 = transform.transform(new Point2D.Double(ox + odx, oy + ody), + (Point2D) null); + int x = (int)pos.getX(); + int y = (int)pos.getY(); + int width = (int)(dim.getX() - pos.getX()); + int height = (int)(dim.getY() - pos.getY()); + int dx = (int)(p2.getX() - pos.getX()); + int dy = (int)(p2.getY() - pos.getY()); + + Rectangle2D r = getRealBounds(); + + if( width <= 0 || height <= 0 ) + return; + // Return if outside the surface + if( x + dx > r.getWidth() || y + dy > r.getHeight() ) + return; + + if( x + dx + width < r.getX() || y + dy + height < r.getY() ) + return; + + // Clip edges if necessary + if( x + dx < r.getX() ) // left + { + width = x + dx + width; + x = (int)r.getX() - dx; + } + + if( y + dy < r.getY() ) // top + { + height = y + dy + height; + y = (int)r.getY() - dy; + } + + if( x + dx + width >= r.getWidth() ) // right + width = (int)r.getWidth() - dx - x; + + if( y + dy + height >= r.getHeight() ) // bottom + height = (int)r.getHeight() - dy - y; + + copyAreaImpl(x, y, width, height, dx, dy); + } + + ///////////////////////// RENDERING HINTS /////////////////////////////////// + + public void setRenderingHint(RenderingHints.Key hintKey, Object hintValue) + { + hints.put(hintKey, hintValue); + + shiftDrawCalls = hints.containsValue(RenderingHints.VALUE_STROKE_NORMALIZE) + || hints.containsValue(RenderingHints.VALUE_STROKE_DEFAULT); + } + + public Object getRenderingHint(RenderingHints.Key hintKey) + { + return hints.get(hintKey); + } + + public void setRenderingHints(Map<?,?> hints) + { + this.hints = new RenderingHints(getDefaultHints()); + this.hints.putAll(hints); + + shiftDrawCalls = hints.containsValue(RenderingHints.VALUE_STROKE_NORMALIZE) + || hints.containsValue(RenderingHints.VALUE_STROKE_DEFAULT); + + if (compCtx != null) + { + compCtx.dispose(); + compCtx = comp.createContext(getNativeCM(), getNativeCM(), this.hints); + } + } + + public void addRenderingHints(Map hints) + { + this.hints.putAll(hints); + } + + public RenderingHints getRenderingHints() + { + return hints; + } + + private int getInterpolation() + { + if (this.hints.containsValue(RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR)) + return INTERPOLATION_NEAREST; + + else if (hints.containsValue(RenderingHints.VALUE_INTERPOLATION_BILINEAR)) + return INTERPOLATION_BILINEAR; + + else if (hints.containsValue(RenderingHints.VALUE_INTERPOLATION_BICUBIC)) + return INTERPOLATION_BICUBIC; + + else if (hints.containsValue(RenderingHints.VALUE_ALPHA_INTERPOLATION_SPEED)) + return ALPHA_INTERPOLATION_SPEED; + + else if (hints.containsValue(RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY)) + return ALPHA_INTERPOLATION_QUALITY; + + else if (hints.containsValue(RenderingHints.VALUE_ALPHA_INTERPOLATION_DEFAULT)) + return ALPHA_INTERPOLATION_DEFAULT; + + // Do bilinear interpolation as default + return INTERPOLATION_BILINEAR; + } + + /** + * Set antialias if needed. If the ignoreAA flag is set, this method will + * return without doing anything. + * + * @param needAA RenderingHints.VALUE_ANTIALIAS_ON or RenderingHints.VALUE_ANTIALIAS_OFF + */ + private void setAntialias(boolean needAA) + { + if (ignoreAA) + return; + + if (needAA != antialias) + { + antialias = !antialias; + cairoSetAntialias(nativePointer, antialias); + } + } + + ///////////////////////// IMAGE. METHODS /////////////////////////////////// + + protected boolean drawImage(Image img, AffineTransform xform, + Color bgcolor, ImageObserver obs) + { + if (img == null) + return false; + + if (xform == null) + xform = new AffineTransform(); + + // In this case, xform is an AffineTransform that transforms bounding + // box of the specified image from image space to user space. However + // when we pass this transform to cairo, cairo will use this transform + // to map "user coordinates" to "pixel" coordinates, which is the + // other way around. Therefore to get the "user -> pixel" transform + // that cairo wants from "image -> user" transform that we currently + // have, we will need to invert the transformation matrix. + AffineTransform invertedXform; + + try + { + invertedXform = xform.createInverse(); + } + catch (NoninvertibleTransformException e) + { + throw new ImagingOpException("Unable to invert transform " + + xform.toString()); + } + + // Unrecognized image - convert to a BufferedImage + // Note - this can get us in trouble when the gdk lock is re-acquired. + // for example by VolatileImage. See ComponentGraphics for how we work + // around this. + img = AsyncImage.realImage(img, obs); + if( !(img instanceof BufferedImage) ) + { + ImageProducer source = img.getSource(); + if (source == null) + return false; + img = Toolkit.getDefaultToolkit().createImage(source); + } + + BufferedImage b = (BufferedImage) img; + Raster raster; + double[] i2u = new double[6]; + int width = b.getWidth(); + int height = b.getHeight(); + + // If this BufferedImage has a BufferedImageGraphics object, + // use the cached CairoSurface that BIG is drawing onto + + if( BufferedImageGraphics.bufferedImages.get( b ) != null ) + raster = BufferedImageGraphics.bufferedImages.get( b ); + else + raster = b.getRaster(); + + invertedXform.getMatrix(i2u); + + double alpha = 1.0; + if (comp instanceof AlphaComposite) + alpha = ((AlphaComposite) comp).getAlpha(); + + if(raster instanceof CairoSurface + && ((CairoSurface)raster).sharedBuffer == true) + { + drawCairoSurface((CairoSurface)raster, xform, alpha, getInterpolation()); + updateColor(); + return true; + } + + if( bgcolor != null ) + { + Color oldColor = bg; + setBackground(bgcolor); + + Rectangle2D bounds = new Rectangle2D.Double(0, 0, width, height); + bounds = getTransformedBounds(bounds, xform); + + clearRect((int)bounds.getX(), (int)bounds.getY(), + (int)bounds.getWidth(), (int)bounds.getHeight()); + + setBackground(oldColor); + } + + int[] pixels = b.getRGB(0, 0, width, height, null, 0, width); + // FIXME: The above method returns data in the standard ARGB colorspace, + // meaning data should NOT be alpha pre-multiplied; however Cairo expects + // data to be premultiplied. + + cairoSave(nativePointer); + Rectangle2D bounds = new Rectangle2D.Double(0, 0, width, height); + bounds = getTransformedBounds(bounds, xform); + cairoRectangle(nativePointer, bounds.getX(), bounds.getY(), + bounds.getWidth(), bounds.getHeight()); + cairoClip(nativePointer); + + drawPixels(nativePointer, pixels, width, height, width, i2u, alpha, + getInterpolation()); + + cairoRestore(nativePointer); + + // Cairo seems to lose the current color which must be restored. + updateColor(); + return true; + } + + public void drawRenderedImage(RenderedImage image, AffineTransform xform) + { + drawRaster(image.getColorModel(), image.getData(), xform, null); + } + + public void drawRenderableImage(RenderableImage image, AffineTransform xform) + { + drawRenderedImage(image.createRendering(new RenderContext(xform)), xform); + } + + public boolean drawImage(Image img, AffineTransform xform, ImageObserver obs) + { + return drawImage(img, xform, null, obs); + } + + public void drawImage(BufferedImage image, BufferedImageOp op, int x, int y) + { + Image filtered = image; + if (op != null) + filtered = op.filter(image, null); + drawImage(filtered, new AffineTransform(1f, 0f, 0f, 1f, x, y), null, null); + } + + public boolean drawImage(Image img, int x, int y, ImageObserver observer) + { + return drawImage(img, new AffineTransform(1f, 0f, 0f, 1f, x, y), null, + observer); + } + + public boolean drawImage(Image img, int x, int y, Color bgcolor, + ImageObserver observer) + { + return drawImage(img, x, y, img.getWidth(observer), + img.getHeight(observer), bgcolor, observer); + } + + public boolean drawImage(Image img, int x, int y, int width, int height, + Color bgcolor, ImageObserver observer) + { + double scaleX = width / (double) img.getWidth(observer); + double scaleY = height / (double) img.getHeight(observer); + if( scaleX == 0 || scaleY == 0 ) + return true; + + return drawImage(img, new AffineTransform(scaleX, 0f, 0f, scaleY, x, y), + bgcolor, observer); + } + + public boolean drawImage(Image img, int x, int y, int width, int height, + ImageObserver observer) + { + return drawImage(img, x, y, width, height, null, observer); + } + + public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, + int sx1, int sy1, int sx2, int sy2, Color bgcolor, + ImageObserver observer) + { + if (img == null) + return false; + + int sourceWidth = sx2 - sx1; + int sourceHeight = sy2 - sy1; + + int destWidth = dx2 - dx1; + int destHeight = dy2 - dy1; + + if(destWidth == 0 || destHeight == 0 || sourceWidth == 0 || + sourceHeight == 0) + return true; + + double scaleX = destWidth / (double) sourceWidth; + double scaleY = destHeight / (double) sourceHeight; + + // FIXME: Avoid using an AT if possible here - it's at least twice as slow. + + Shape oldClip = getClip(); + int cx, cy, cw, ch; + if( dx1 < dx2 ) + { cx = dx1; cw = dx2 - dx1; } + else + { cx = dx2; cw = dx1 - dx2; } + if( dy1 < dy2 ) + { cy = dy1; ch = dy2 - dy1; } + else + { cy = dy2; ch = dy1 - dy2; } + + clipRect( cx, cy, cw, ch ); + + AffineTransform tx = new AffineTransform(); + tx.translate( dx1 - sx1*scaleX, dy1 - sy1*scaleY ); + tx.scale( scaleX, scaleY ); + + boolean retval = drawImage(img, tx, bgcolor, observer); + setClip( oldClip ); + return retval; + } + + public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, + int sx1, int sy1, int sx2, int sy2, + ImageObserver observer) + { + return drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, null, observer); + } + + /** + * Optimized method for drawing a CairoSurface onto this graphics context. + * + * @param surface The surface to draw. + * @param tx The transformation matrix (cannot be null). + * @param alpha The alpha value to paint with ( 0 <= alpha <= 1). + * @param interpolation The interpolation type. + */ + protected void drawCairoSurface(CairoSurface surface, AffineTransform tx, + double alpha, int interpolation) + { + // Find offset required if this surface is a sub-raster, and append offset + // to transformation. + if (surface.getSampleModelTranslateX() != 0 + || surface.getSampleModelTranslateY() != 0) + { + Point2D origin = new Point2D.Double(0, 0); + Point2D offset = new Point2D.Double(surface.getSampleModelTranslateX(), + surface.getSampleModelTranslateY()); + + tx.transform(origin, origin); + tx.transform(offset, offset); + + tx.translate(offset.getX() - origin.getX(), + offset.getY() - origin.getY()); + } + + // Find dimensions of this surface relative to the root parent surface + Rectangle bounds = new Rectangle(-surface.getSampleModelTranslateX(), + -surface.getSampleModelTranslateY(), + surface.width, surface.height); + + // Clip to the translated image + // We use direct cairo methods to avoid the overhead of maintaining a + // java copy of the clip, since we will be reverting it immediately + // after drawing + Shape newBounds = tx.createTransformedShape(bounds); + cairoSave(nativePointer); + walkPath(newBounds.getPathIterator(null), false); + cairoClip(nativePointer); + + // Draw the surface + try + { + double[] i2u = new double[6]; + tx.createInverse().getMatrix(i2u); + surface.nativeDrawSurface(surface.surfacePointer, nativePointer, i2u, + alpha, interpolation); + } + catch (NoninvertibleTransformException ex) + { + // This should never happen(?), so we don't need to do anything here. + ; + } + + // Restore clip + cairoRestore(nativePointer); + } + + + ///////////////////////// TEXT METHODS //////////////////////////////////// + + public void drawString(String str, float x, float y) + { + if (str == null || str.length() == 0) + return; + GdkFontPeer fontPeer = (GdkFontPeer) font.getPeer(); + TextLayout tl = (TextLayout) fontPeer.textLayoutCache.get(str); + if (tl == null) + { + tl = new TextLayout( str, getFont(), getFontRenderContext() ); + fontPeer.textLayoutCache.put(str, tl); + } + + // Set antialias to text_antialiasing, and set the ignoreAA flag so that + // the setting doesn't get overridden in a draw() or fill() call. + setAntialias(!hints.get(RenderingHints.KEY_TEXT_ANTIALIASING) + .equals(RenderingHints.VALUE_TEXT_ANTIALIAS_OFF)); + ignoreAA = true; + + tl.draw(this, x, y); + ignoreAA = false; + } + + public void drawString(String str, int x, int y) + { + drawString (str, (float) x, (float) y); + } + + public void drawString(AttributedCharacterIterator ci, int x, int y) + { + drawString (ci, (float) x, (float) y); + } + + public void drawGlyphVector(GlyphVector gv, float x, float y) + { + double alpha = 1.0; + + if( gv.getNumGlyphs() <= 0 ) + return; + + if (customPaint) + setCustomPaint(gv.getOutline().getBounds()); + + if (comp instanceof AlphaComposite) + alpha = ((AlphaComposite) comp).getAlpha(); + + setAntialias(!hints.get(RenderingHints.KEY_TEXT_ANTIALIASING) + .equals(RenderingHints.VALUE_TEXT_ANTIALIAS_OFF)); + ignoreAA = true; + + if (gv instanceof FreetypeGlyphVector && alpha == 1.0 + && !((FreetypeGlyphVector)gv).hasTransforms()) + { + int n = gv.getNumGlyphs (); + int[] codes = gv.getGlyphCodes (0, n, null); + long[] fontset = ((FreetypeGlyphVector)gv).getGlyphFonts (0, n, null); + float[] positions = gv.getGlyphPositions (0, n, null); + + setFont (gv.getFont ()); + GdkFontPeer fontPeer = (GdkFontPeer) font.getPeer(); + synchronized (fontPeer) + { + cairoDrawGlyphVector(nativePointer, fontPeer, + x, y, n, codes, positions, fontset); + } + } + else + { + translate(x, y); + fill(gv.getOutline()); + translate(-x, -y); + } + + ignoreAA = false; + } + + public void drawString(AttributedCharacterIterator ci, float x, float y) + { + GlyphVector gv = getFont().createGlyphVector(getFontRenderContext(), ci); + drawGlyphVector(gv, x, y); + } + + /** + * Should perhaps be contexct dependent, but this is left for now as an + * overloadable default implementation. + */ + public FontRenderContext getFontRenderContext() + { + return new FontRenderContext(transform, true, true); + } + + // Until such time as pango is happy to talk directly to cairo, we + // actually need to redirect some calls from the GtkFontPeer and + // GtkFontMetrics into the drawing kit and ask cairo ourselves. + + public FontMetrics getFontMetrics() + { + return getFontMetrics(getFont()); + } + + public FontMetrics getFontMetrics(Font f) + { + return ((GdkFontPeer) f.getPeer()).getFontMetrics(f); + } + + public void setFont(Font f) + { + // Sun's JDK does not throw NPEs, instead it leaves the current setting + // unchanged. So do we. + if (f == null) + return; + + if (f.getPeer() instanceof GdkFontPeer) + font = f; + else + font = + ((ClasspathToolkit)(Toolkit.getDefaultToolkit())) + .getFont(f.getName(), f.getAttributes()); + + GdkFontPeer fontpeer = (GdkFontPeer) getFont().getPeer(); + synchronized (fontpeer) + { + cairoSetFont(nativePointer, fontpeer); + } + } + + public Font getFont() + { + if (font == null) + return new Font("SansSerif", Font.PLAIN, 12); + return font; + } + + /////////////////////// MISC. PUBLIC METHODS ///////////////////////////////// + + public boolean hit(Rectangle rect, Shape s, boolean onStroke) + { + if( onStroke ) + { + Shape stroked = stroke.createStrokedShape( s ); + return stroked.intersects( (double)rect.x, (double)rect.y, + (double)rect.width, (double)rect.height ); + } + return s.intersects( (double)rect.x, (double)rect.y, + (double)rect.width, (double)rect.height ); + } + + public String toString() + { + return (getClass().getName() + + "[font=" + getFont().toString() + + ",color=" + fg.toString() + + "]"); + } + + ///////////////////////// PRIVATE METHODS /////////////////////////////////// + + /** + * All the drawImage() methods eventually get delegated here if the image + * is not a Cairo surface. + * + * @param bgcolor - if non-null draws the background color before + * drawing the image. + */ + private boolean drawRaster(ColorModel cm, Raster r, + AffineTransform imageToUser, Color bgcolor) + { + if (r == null) + return false; + + SampleModel sm = r.getSampleModel(); + DataBuffer db = r.getDataBuffer(); + + if (db == null || sm == null) + return false; + + if (cm == null) + cm = ColorModel.getRGBdefault(); + + double[] i2u = new double[6]; + if (imageToUser != null) + imageToUser.getMatrix(i2u); + else + { + i2u[0] = 1; + i2u[1] = 0; + i2u[2] = 0; + i2u[3] = 1; + i2u[4] = 0; + i2u[5] = 0; + } + + int[] pixels = findSimpleIntegerArray(cm, r); + + if (pixels == null) + { + // FIXME: I don't think this code will work correctly with a non-RGB + // MultiPixelPackedSampleModel. Although this entire method should + // probably be rewritten to better utilize Cairo's different supported + // data formats. + if (sm instanceof MultiPixelPackedSampleModel) + { + pixels = r.getPixels(0, 0, r.getWidth(), r.getHeight(), pixels); + for (int i = 0; i < pixels.length; i++) + pixels[i] = cm.getRGB(pixels[i]); + } + else + { + pixels = new int[r.getWidth() * r.getHeight()]; + for (int i = 0; i < pixels.length; i++) + pixels[i] = cm.getRGB(db.getElem(i)); + } + } + + // Change all transparent pixels in the image to the specified bgcolor, + // or (if there's no alpha) fill in an alpha channel so that it paints + // correctly. + if (cm.hasAlpha()) + { + if (bgcolor != null && cm.hasAlpha()) + for (int i = 0; i < pixels.length; i++) + { + if (cm.getAlpha(pixels[i]) == 0) + pixels[i] = bgcolor.getRGB(); + } + } + else + for (int i = 0; i < pixels.length; i++) + pixels[i] |= 0xFF000000; + + double alpha = 1.0; + if (comp instanceof AlphaComposite) + alpha = ((AlphaComposite) comp).getAlpha(); + + drawPixels(nativePointer, pixels, r.getWidth(), r.getHeight(), + r.getWidth(), i2u, alpha, getInterpolation()); + + // Cairo seems to lose the current color which must be restored. + updateColor(); + + return true; + } + + /** + * Shifts an x-coordinate by 0.5 in device space. + */ + private double shiftX(double coord, boolean doShift) + { + if (doShift) + { + double shift = 0.5; + if (!transform.isIdentity()) + shift /= transform.getScaleX(); + return (coord + shift); + } + else + return coord; + } + + /** + * Shifts a y-coordinate by 0.5 in device space. + */ + private double shiftY(double coord, boolean doShift) + { + if (doShift) + { + double shift = 0.5; + if (!transform.isIdentity()) + shift /= transform.getScaleY(); + return (coord + shift); + } + else + return coord; + } + + /** + * Adds a pathIterator to the current Cairo path, also sets the cairo winding rule. + */ + private void walkPath(PathIterator p, boolean doShift) + { + double x = 0; + double y = 0; + double[] coords = new double[6]; + + cairoSetFillRule(nativePointer, p.getWindingRule()); + for (; ! p.isDone(); p.next()) + { + int seg = p.currentSegment(coords); + switch (seg) + { + case PathIterator.SEG_MOVETO: + x = shiftX(coords[0], doShift); + y = shiftY(coords[1], doShift); + cairoMoveTo(nativePointer, x, y); + break; + case PathIterator.SEG_LINETO: + x = shiftX(coords[0], doShift); + y = shiftY(coords[1], doShift); + cairoLineTo(nativePointer, x, y); + break; + case PathIterator.SEG_QUADTO: + // splitting a quadratic bezier into a cubic: + // see: http://pfaedit.sourceforge.net/bezier.html + double x1 = x + (2.0 / 3.0) * (shiftX(coords[0], doShift) - x); + double y1 = y + (2.0 / 3.0) * (shiftY(coords[1], doShift) - y); + + double x2 = x1 + (1.0 / 3.0) * (shiftX(coords[2], doShift) - x); + double y2 = y1 + (1.0 / 3.0) * (shiftY(coords[3], doShift) - y); + + x = shiftX(coords[2], doShift); + y = shiftY(coords[3], doShift); + cairoCurveTo(nativePointer, x1, y1, x2, y2, x, y); + break; + case PathIterator.SEG_CUBICTO: + x = shiftX(coords[4], doShift); + y = shiftY(coords[5], doShift); + cairoCurveTo(nativePointer, shiftX(coords[0], doShift), + shiftY(coords[1], doShift), + shiftX(coords[2], doShift), + shiftY(coords[3], doShift), x, y); + break; + case PathIterator.SEG_CLOSE: + cairoClosePath(nativePointer); + break; + } + } + } + + /** + * Used by setRenderingHints() + */ + private Map<RenderingHints.Key, Object> getDefaultHints() + { + HashMap<RenderingHints.Key, Object> defaultHints = + new HashMap<RenderingHints.Key, Object>(); + + defaultHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, + RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT); + + defaultHints.put(RenderingHints.KEY_STROKE_CONTROL, + RenderingHints.VALUE_STROKE_DEFAULT); + + defaultHints.put(RenderingHints.KEY_FRACTIONALMETRICS, + RenderingHints.VALUE_FRACTIONALMETRICS_OFF); + + defaultHints.put(RenderingHints.KEY_ANTIALIASING, + RenderingHints.VALUE_ANTIALIAS_OFF); + + defaultHints.put(RenderingHints.KEY_RENDERING, + RenderingHints.VALUE_RENDER_DEFAULT); + + return defaultHints; + } + + /** + * Used by drawRaster and GdkPixbufDecoder + */ + public static int[] findSimpleIntegerArray (ColorModel cm, Raster raster) + { + if (cm == null || raster == null) + return null; + + if (! cm.getColorSpace().isCS_sRGB()) + return null; + + if (! (cm instanceof DirectColorModel)) + return null; + + DirectColorModel dcm = (DirectColorModel) cm; + + if (dcm.getRedMask() != 0x00FF0000 || dcm.getGreenMask() != 0x0000FF00 + || dcm.getBlueMask() != 0x000000FF) + return null; + + if (! (raster instanceof WritableRaster)) + return null; + + if (raster.getSampleModel().getDataType() != DataBuffer.TYPE_INT) + return null; + + if (! (raster.getDataBuffer() instanceof DataBufferInt)) + return null; + + DataBufferInt db = (DataBufferInt) raster.getDataBuffer(); + + if (db.getNumBanks() != 1) + return null; + + // Finally, we have determined that this is a single bank, [A]RGB-int + // buffer in sRGB space. It's worth checking all this, because it means + // that cairo can paint directly into the data buffer, which is very + // fast compared to all the normal copying and converting. + + return db.getData(); + } + + /** + * Helper method to transform the clip. This is called by the various + * transformation-manipulation methods to update the clip (which is in + * userspace) accordingly. + * + * The transform usually is the inverse transform that was applied to the + * graphics object. + * + * @param t the transform to apply to the clip + */ + private void updateClip(AffineTransform t) + { + if (clip == null) + return; + + // If the clip is a rectangle, and the transformation preserves the shape + // (translate/stretch only), then keep the clip as a rectangle + double[] matrix = new double[4]; + t.getMatrix(matrix); + if (clip instanceof Rectangle2D && matrix[1] == 0 && matrix[2] == 0) + { + Rectangle2D rect = (Rectangle2D)clip; + double[] origin = new double[] {rect.getX(), rect.getY()}; + double[] dimensions = new double[] {rect.getWidth(), rect.getHeight()}; + t.transform(origin, 0, origin, 0, 1); + t.deltaTransform(dimensions, 0, dimensions, 0, 1); + rect.setRect(origin[0], origin[1], dimensions[0], dimensions[1]); + } + else + { + if (! (clip instanceof GeneralPath)) + clip = new GeneralPath(clip); + + GeneralPath p = (GeneralPath) clip; + p.transform(t); + } + } + + private static Rectangle computeIntersection(int x, int y, int w, int h, + Rectangle rect) + { + int x2 = rect.x; + int y2 = rect.y; + int w2 = rect.width; + int h2 = rect.height; + + int dx = (x > x2) ? x : x2; + int dy = (y > y2) ? y : y2; + int dw = (x + w < x2 + w2) ? (x + w - dx) : (x2 + w2 - dx); + int dh = (y + h < y2 + h2) ? (y + h - dy) : (y2 + h2 - dy); + + if (dw >= 0 && dh >= 0) + rect.setBounds(dx, dy, dw, dh); + else + rect.setBounds(0, 0, 0, 0); + + return rect; + } + + static Rectangle2D getTransformedBounds(Rectangle2D bounds, AffineTransform tx) + { + double x1 = bounds.getX(); + double x2 = bounds.getX() + bounds.getWidth(); + double x3 = x1; + double x4 = x2; + double y1 = bounds.getY(); + double y2 = y1; + double y3 = bounds.getY() + bounds.getHeight(); + double y4 = y3; + + double[] points = new double[] {x1, y1, x2, y2, x3, y3, x4, y4}; + tx.transform(points, 0, points, 0, 4); + + double minX = points[0]; + double maxX = minX; + double minY = points[1]; + double maxY = minY; + for (int i = 0; i < 8; i++) + { + if (points[i] < minX) + minX = points[i]; + if (points[i] > maxX) + maxX = points[i]; + i++; + + if (points[i] < minY) + minY = points[i]; + if (points[i] > maxY) + maxY = points[i]; + } + + return new Rectangle2D.Double(minX, minY, (maxX - minX), (maxY - minY)); + } +} |