1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkBounder.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkBounder_DEFINED
1.14 +#define SkBounder_DEFINED
1.15 +
1.16 +#include "SkTypes.h"
1.17 +#include "SkRefCnt.h"
1.18 +#include "SkPoint.h"
1.19 +
1.20 +struct SkGlyph;
1.21 +struct SkIRect;
1.22 +struct SkPoint;
1.23 +struct SkRect;
1.24 +class SkPaint;
1.25 +class SkPath;
1.26 +class SkRegion;
1.27 +
1.28 +/** \class SkBounder
1.29 +
1.30 + Base class for intercepting the device bounds of shapes before they are drawn.
1.31 + Install a subclass of this in your canvas.
1.32 +*/
1.33 +class SkBounder : public SkRefCnt {
1.34 +public:
1.35 + SK_DECLARE_INST_COUNT(SkBounder)
1.36 +
1.37 + SkBounder();
1.38 +
1.39 + /* Call to perform a clip test before calling onIRect.
1.40 + Returns the result from onIRect.
1.41 + */
1.42 + bool doIRect(const SkIRect&);
1.43 + bool doIRectGlyph(const SkIRect& , int x, int y, const SkGlyph&);
1.44 +
1.45 +protected:
1.46 + /** Override in your subclass. This is called with the device bounds of an
1.47 + object (text, geometry, image) just before it is drawn. If your method
1.48 + returns false, the drawing for that shape is aborted. If your method
1.49 + returns true, drawing continues. The bounds your method receives have already
1.50 + been transformed in to device coordinates, and clipped to the current clip.
1.51 + */
1.52 + virtual bool onIRect(const SkIRect&) {
1.53 + return false;
1.54 + }
1.55 +
1.56 + /** Passed to onIRectGlyph with the information about the current glyph.
1.57 + LSB and RSB are fixed-point (16.16) coordinates of the start and end
1.58 + of the glyph's advance
1.59 + */
1.60 + struct GlyphRec {
1.61 + SkIPoint fLSB; //!< fixed-point left-side-bearing of the glyph
1.62 + SkIPoint fRSB; //!< fixed-point right-side-bearing of the glyph
1.63 + uint16_t fGlyphID;
1.64 + uint16_t fFlags; //!< currently set to 0
1.65 + };
1.66 +
1.67 + /** Optionally, override in your subclass to receive the glyph ID when
1.68 + text drawing supplies the device bounds of the object.
1.69 + */
1.70 + virtual bool onIRectGlyph(const SkIRect& r, const GlyphRec&) {
1.71 + return onIRect(r);
1.72 + }
1.73 +
1.74 + /** Called after each shape has been drawn. The default implementation does
1.75 + nothing, but your override could use this notification to signal itself
1.76 + that the offscreen being rendered into needs to be updated to the screen.
1.77 + */
1.78 + virtual void commit();
1.79 +
1.80 +private:
1.81 + bool doHairline(const SkPoint&, const SkPoint&, const SkPaint&);
1.82 + bool doRect(const SkRect&, const SkPaint&);
1.83 + bool doPath(const SkPath&, const SkPaint&, bool doFill);
1.84 + void setClip(const SkRegion* clip) { fClip = clip; }
1.85 +
1.86 + const SkRegion* fClip;
1.87 + friend class SkAutoBounderCommit;
1.88 + friend class SkDraw;
1.89 + friend class SkDrawIter;
1.90 + friend struct Draw1Glyph;
1.91 + friend class SkMaskFilter;
1.92 +
1.93 + typedef SkRefCnt INHERITED;
1.94 +};
1.95 +
1.96 +#endif
