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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkShadowPaintFilterCanvas_DEFINED
#define SkShadowPaintFilterCanvas_DEFINED
#include "SkPaintFilterCanvas.h"
#ifdef SK_EXPERIMENTAL_SHADOWING
/** \class SkShadowPaintFilterCanvas
*
* A utility proxy class for implementing shadow maps.
*
* We override the onFilter method to draw depths into the canvas
* depending on the current draw depth of the canvas, throwing out
* the actual draw color.
*
* Note that we can only do this for one light at a time!
* It is up to the user to set the 0th light in fLights to
* the light the want to render the depth map with.
*/
class SkShadowPaintFilterCanvas : public SkPaintFilterCanvas {
public:
SkShadowPaintFilterCanvas(SkCanvas *canvas);
// TODO use a shader instead
bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type type) const override;
static SkISize ComputeDepthMapSize(const SkLights::Light& light, int maxDepth,
int width, int height);
void setShadowParams(const SkShadowParams ¶ms);
protected:
void updateMatrix();
void onDrawPicture(const SkPicture *picture, const SkMatrix *matrix,
const SkPaint *paint) override;
void onDrawPaint(const SkPaint &paint) override;
void onDrawPoints(PointMode mode, size_t count, const SkPoint pts[],
const SkPaint &paint) override;
void onDrawRect(const SkRect &rect, const SkPaint &paint) override;
void onDrawRRect(const SkRRect &rrect, const SkPaint &paint) override;
void onDrawDRRect(const SkRRect &outer, const SkRRect &inner,
const SkPaint &paint) override;
void onDrawOval(const SkRect &rect, const SkPaint &paint) override;
void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override;
void onDrawPath(const SkPath &path, const SkPaint &paint) override;
void onDrawBitmap(const SkBitmap &bm, SkScalar left, SkScalar top,
const SkPaint *paint) override;
void onDrawBitmapRect(const SkBitmap &bm, const SkRect *src, const SkRect &dst,
const SkPaint *paint, SrcRectConstraint constraint) override;
void onDrawBitmapNine(const SkBitmap &bm, const SkIRect ¢er,
const SkRect &dst, const SkPaint *paint) override;
void onDrawImage(const SkImage *image, SkScalar left, SkScalar top,
const SkPaint *paint) override;
void onDrawImageRect(const SkImage *image, const SkRect *src,
const SkRect &dst, const SkPaint *paint,
SrcRectConstraint constraint) override;
void onDrawImageNine(const SkImage *image, const SkIRect ¢er,
const SkRect &dst, const SkPaint *paint) override;
void onDrawVertices(VertexMode vmode, int vertexCount,
const SkPoint vertices[], const SkPoint texs[],
const SkColor colors[], SkXfermode *xmode,
const uint16_t indices[], int indexCount,
const SkPaint &paint) override;
void onDrawPatch(const SkPoint cubics[], const SkColor colors[],
const SkPoint texCoords[], SkXfermode *xmode,
const SkPaint &paint) override;
void onDrawText(const void *text, size_t byteLength, SkScalar x, SkScalar y,
const SkPaint &paint) override;
void onDrawPosText(const void *text, size_t byteLength, const SkPoint pos[],
const SkPaint &paint) override;
void onDrawPosTextH(const void *text, size_t byteLength, const SkScalar xpos[],
SkScalar constY, const SkPaint &paint) override;
void onDrawTextOnPath(const void *text, size_t byteLength, const SkPath &path,
const SkMatrix *matrix, const SkPaint &paint) override;
void onDrawTextRSXform(const void *text, size_t byteLength,
const SkRSXform xform[], const SkRect *cull,
const SkPaint &paint) override;
void onDrawTextBlob(const SkTextBlob *blob, SkScalar x,
SkScalar y, const SkPaint &paint) override;
private:
SkShadowParams fShadowParams;
typedef SkPaintFilterCanvas INHERITED;
};
#endif
#endif
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