com.sun.scenario.effect.impl.state.RenderState Maven / Gradle / Ivy
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package com.sun.scenario.effect.impl.state;
import com.sun.javafx.geom.Rectangle;
import com.sun.javafx.geom.transform.BaseTransform;
/**
* A class that encapsulates all of the information needed to plan and execute
* a single filter operation. An instance of the class is instantiated at
* the start of an {@link Effect.filter()} operation and it is queried for
* various pieces of information required to perform that operation including,
* but not limited to, the coordinate space to be used for the child input
* {@code Effect} operations and the coordinate transform to be applied to
* the resulting final {@code ImageData} object produced as the result of that
* filter operation. Some effect-specific subclasses may also plan and supply
* information about how the various pixels are to be computed in the inner
* loops of the effect filter algorithm.
*/
public interface RenderState {
/**
* This enum characterizes the types of coordinate spaces that will be
* used for the filter operation (i.e. handed to the dependent input
* {@code Effect} objects) and applied to the result of the filter.
*/
public static enum EffectCoordinateSpace {
/**
* The {@link RenderState} object will specify an IDENTITY transform
* for the input transform and the original filter transform as
* the result transform.
*/
UserSpace,
/**
* The {@link RenderState} object will specify custom transform objects
* for both the input transform and the result transform with the only
* constraint that the two will concatenate to produce the original
* filter transform.
*
* BaseTransform inputtx = getInputTransform(filtertx);
* BaseTransform resulttx = getResultTransform(filtertx);
* // Ignoring the potential for concatenate to modify the
* // return values from the above two methods, this virtual
* // assert statement is just for the sake of documenting
* // the intended constraints.
* assert(filtertx.equalsApproximately(resulttx.concatenate(inputtx)));
*
*/
CustomSpace,
/**
* The {@link RenderState} object will specify the original filter
* transform as the input transform and an IDENTITY transform for
* the result transform.
*/
RenderSpace,
}
/**
* A helper implementation of {@link RenderState} that handles the
* case of {@code EffectCoordinateSpace.UserSpace} and passes along
* the outputClip to the inputs unmodified.
*/
public static final RenderState UserSpaceRenderState =
new RenderState() {
@Override
public EffectCoordinateSpace getEffectTransformSpace() {
return EffectCoordinateSpace.UserSpace;
}
@Override
public BaseTransform getInputTransform(BaseTransform filterTransform) {
return BaseTransform.IDENTITY_TRANSFORM;
}
@Override
public BaseTransform getResultTransform(BaseTransform filterTransform) {
return filterTransform;
}
@Override
public Rectangle getInputClip(int i, Rectangle filterClip) {
return filterClip;
}
};
/**
* A helper implementation of {@link RenderState} that handles the
* case of {@code EffectCoordinateSpace.UserSpace} and passes along
* the outputClip to the inputs unmodified.
*/
public static final RenderState UnclippedUserSpaceRenderState =
new RenderState() {
@Override
public EffectCoordinateSpace getEffectTransformSpace() {
return EffectCoordinateSpace.UserSpace;
}
@Override
public BaseTransform getInputTransform(BaseTransform filterTransform) {
return BaseTransform.IDENTITY_TRANSFORM;
}
@Override
public BaseTransform getResultTransform(BaseTransform filterTransform) {
return filterTransform;
}
@Override
public Rectangle getInputClip(int i, Rectangle filterClip) {
return null;
}
};
/**
* A helper implementation of {@link RenderState} that handles the
* case of {@code EffectCoordinateSpace.RenderSpace} and passes along
* the outputClip to the inputs unmodified.
*/
public static final RenderState RenderSpaceRenderState =
new RenderState() {
@Override
public EffectCoordinateSpace getEffectTransformSpace() {
return EffectCoordinateSpace.RenderSpace;
}
@Override
public BaseTransform getInputTransform(BaseTransform filterTransform) {
return filterTransform;
}
@Override
public BaseTransform getResultTransform(BaseTransform filterTransform) {
return BaseTransform.IDENTITY_TRANSFORM;
}
@Override
public Rectangle getInputClip(int i, Rectangle filterClip) {
// REMIND: Need to factor out a few implementations here...
return filterClip;
}
};
/**
* Return a hint indicating which coordinate space should be used for
* the pixel filtering for this particular filtering operation.
* The {@link #getEffectTransform(com.sun.javafx.geom.transform.BaseTransform)
* getEffectTransform()} and {@link #getResultTransform(com.sun.javafx.geom.transform.BaseTransform)
* getResultTransform()} methods will always be used to get the actual
* transforms to be used to get input data and transform the results, but
* this method can help to set the expectations of the caller to optimize
* techniques.
*
* @return an {@link EffectSpace} value to describe the expected output
* from the {@code getEffectTransform(...)} and {@code getResultTransform(...)}
* methods.
*/
public EffectCoordinateSpace getEffectTransformSpace();
/**
* Return the transform that should be used to obtain pixel input from the
* {@code Effect} inputs for this filter operation.
* The returned transform is handed to all input {@code Effect} objects
* to obtain pixel data for the inputs.
* Typically, the output of {@code getInputTransform(transform)} and
* {@code getResultTransform(transform)} could be concatenated to produce
* the original {@code filterTransform}.
*
* @param filterTransform the {@code BaseTransform} object for the filter operation
* @return the {@code BaseTransform} object to use for the input effects
*/
public BaseTransform getInputTransform(BaseTransform filterTransform);
/**
* Return the transform that should be used to transform the results of
* the filter operation.
* The returned transform is combined with the resulting filter result
* texture to produce an output ImageData object.
* Typically, the output of {@code getInputTransform(transform)} and
* {@code getResultTransform(transform)} could be concatenated to produce
* the original {@code filterTransform}.
*
* @param filterTransform the {@code BaseTransform} object for the filter operation
* @return the {@code BaseTransform} object to be applied to the result
* texture
*/
public BaseTransform getResultTransform(BaseTransform filterTransform);
/**
* Return the clip for the indicated input based on the indicated output
* clip.
*
* @param i the index of the input being processed
* @param filterClip the output clip supplied to the given filter operation
* @return the required rectangle from the indicated input to provide
* enough pixels to produce the indicated output clip
*/
public Rectangle getInputClip(int i, Rectangle filterClip);
}