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/*
* Copyright 2007-2008 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.java2d.opengl;
import java.awt.GradientPaint;
import java.awt.LinearGradientPaint;
import java.awt.MultipleGradientPaint;
import java.awt.MultipleGradientPaint.ColorSpaceType;
import java.awt.MultipleGradientPaint.CycleMethod;
import java.awt.RadialGradientPaint;
import java.awt.TexturePaint;
import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;
import sun.java2d.SunGraphics2D;
import sun.java2d.SurfaceData;
import sun.java2d.loops.CompositeType;
import static sun.java2d.pipe.BufferedPaints.*;
import static sun.java2d.opengl.OGLContext.OGLContextCaps.*;
abstract class OGLPaints {
/**
* Holds all registered implementations, using the corresponding
* SunGraphics2D.PAINT_* constant as the hash key.
*/
private static Map<Integer, OGLPaints> impls =
new HashMap<Integer, OGLPaints>(4, 1.0f);
static {
impls.put(SunGraphics2D.PAINT_GRADIENT, new Gradient());
impls.put(SunGraphics2D.PAINT_LIN_GRADIENT, new LinearGradient());
impls.put(SunGraphics2D.PAINT_RAD_GRADIENT, new RadialGradient());
impls.put(SunGraphics2D.PAINT_TEXTURE, new Texture());
}
/**
* Attempts to locate an implementation corresponding to the paint state
* of the provided SunGraphics2D object. If no implementation can be
* found, or if the paint cannot be accelerated under the conditions
* of the SunGraphics2D, this method returns false; otherwise, returns
* true.
*/
static boolean isValid(SunGraphics2D sg2d) {
OGLPaints impl = impls.get(sg2d.paintState);
return (impl != null && impl.isPaintValid(sg2d));
}
/**
* Returns true if this implementation is able to accelerate the
* Paint object associated with, and under the conditions of, the
* provided SunGraphics2D instance; otherwise returns false.
*/
abstract boolean isPaintValid(SunGraphics2D sg2d);
/************************* GradientPaint support ****************************/
private static class Gradient extends OGLPaints {
private Gradient() {}
/**
* There are no restrictions for accelerating GradientPaint, so
* this method always returns true.
*/
@Override
boolean isPaintValid(SunGraphics2D sg2d) {
return true;
}
}
/************************** TexturePaint support ****************************/
private static class Texture extends OGLPaints {
private Texture() {}
/**
* Returns true if the given TexturePaint instance can be used by the
* accelerated OGLPaints.Texture implementation. A TexturePaint is
* considered valid if the following conditions are met:
* - the texture image dimensions are power-of-two (or the
* GL_ARB_texture_non_power_of_two extension is present)
* - the texture image can be (or is already) cached in an OpenGL
* texture object
*/
@Override
boolean isPaintValid(SunGraphics2D sg2d) {
TexturePaint paint = (TexturePaint)sg2d.paint;
OGLSurfaceData dstData = (OGLSurfaceData)sg2d.surfaceData;
BufferedImage bi = paint.getImage();
// see if texture-non-pow2 extension is available
if (!dstData.isTexNonPow2Available()) {
int imgw = bi.getWidth();
int imgh = bi.getHeight();
// verify that the texture image dimensions are pow2
if ((imgw & (imgw - 1)) != 0 || (imgh & (imgh - 1)) != 0) {
return false;
}
}
SurfaceData srcData =
dstData.getSourceSurfaceData(bi, sg2d.TRANSFORM_ISIDENT,
CompositeType.SrcOver, null);
if (!(srcData instanceof OGLSurfaceData)) {
// REMIND: this is a hack that attempts to cache the system
// memory image from the TexturePaint instance into an
// OpenGL texture...
srcData =
dstData.getSourceSurfaceData(bi, sg2d.TRANSFORM_ISIDENT,
CompositeType.SrcOver, null);
if (!(srcData instanceof OGLSurfaceData)) {
return false;
}
}
// verify that the source surface is actually a texture
OGLSurfaceData oglData = (OGLSurfaceData)srcData;
if (oglData.getType() != OGLSurfaceData.TEXTURE) {
return false;
}
return true;
}
}
/****************** Shared MultipleGradientPaint support ********************/
private static abstract class MultiGradient extends OGLPaints {
protected MultiGradient() {}
/**
* Returns true if the given MultipleGradientPaint instance can be
* used by the accelerated OGLPaints.MultiGradient implementation.
* A MultipleGradientPaint is considered valid if the following
* conditions are met:
* - the number of gradient "stops" is <= MAX_FRACTIONS
* - the destination has support for fragment shaders
*/
@Override
boolean isPaintValid(SunGraphics2D sg2d) {
MultipleGradientPaint paint = (MultipleGradientPaint)sg2d.paint;
// REMIND: ugh, this creates garbage; would be nicer if
// we had a MultipleGradientPaint.getNumStops() method...
if (paint.getFractions().length > MULTI_MAX_FRACTIONS) {
return false;
}
OGLSurfaceData dstData = (OGLSurfaceData)sg2d.surfaceData;
OGLGraphicsConfig gc = dstData.getOGLGraphicsConfig();
if (!gc.isCapPresent(CAPS_EXT_GRAD_SHADER)) {
return false;
}
return true;
}
}
/********************** LinearGradientPaint support *************************/
private static class LinearGradient extends MultiGradient {
private LinearGradient() {}
@Override
boolean isPaintValid(SunGraphics2D sg2d) {
LinearGradientPaint paint = (LinearGradientPaint)sg2d.paint;
if (paint.getFractions().length == 2 &&
paint.getCycleMethod() != CycleMethod.REPEAT &&
paint.getColorSpace() != ColorSpaceType.LINEAR_RGB)
{
// we can delegate to the optimized two-color gradient
// codepath, which does not require fragment shader support
return true;
}
return super.isPaintValid(sg2d);
}
}
/********************** RadialGradientPaint support *************************/
private static class RadialGradient extends MultiGradient {
private RadialGradient() {}
}
}
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