d055c1fde2
add glyphrec to bounder git-svn-id: http://skia.googlecode.com/svn/trunk@516 2bbb7eff-a529-9590-31e7-b0007b416f81
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkBounder_DEFINED
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#define SkBounder_DEFINED
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#include "SkTypes.h"
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#include "SkRefCnt.h"
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#include "SkPoint.h"
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struct SkGlyph;
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struct SkIRect;
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struct SkPoint;
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struct SkRect;
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class SkPaint;
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class SkPath;
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class SkRegion;
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/** \class SkBounder
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Base class for intercepting the device bounds of shapes before they are drawn.
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Install a subclass of this in your canvas.
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*/
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class SkBounder : public SkRefCnt {
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public:
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/* Call to perform a clip test before calling onIRect.
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Returns the result from onIRect.
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*/
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bool doIRect(const SkIRect&);
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bool doIRectGlyph(const SkIRect& , int x, int y, const SkGlyph&);
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protected:
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/** Override in your subclass. This is called with the device bounds of an
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object (text, geometry, image) just before it is drawn. If your method
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returns false, the drawing for that shape is aborted. If your method
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returns true, drawing continues. The bounds your method receives have already
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been transformed in to device coordinates, and clipped to the current clip.
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*/
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virtual bool onIRect(const SkIRect&) {
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return false;
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}
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/** Passed to onIRectGlyph with the information about the current glyph.
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LSB and RSB are fixed-point (16.16) coordinates of the start and end
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of the glyph's advance
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*/
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struct GlyphRec {
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SkIPoint fLSB; //!< fixed-point left-side-bearing of the glyph
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SkIPoint fRSB; //!< fixed-point right-side-bearing of the glyph
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uint16_t fGlyphID;
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uint16_t fFlags; //!< currently set to 0
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};
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/** Optionally, override in your subclass to receive the glyph ID when
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text drawing supplies the device bounds of the object.
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*/
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virtual bool onIRectGlyph(const SkIRect& r, const GlyphRec&) {
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return onIRect(r);
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}
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/** Called after each shape has been drawn. The default implementation does
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nothing, but your override could use this notification to signal itself
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that the offscreen being rendered into needs to be updated to the screen.
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*/
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virtual void commit();
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private:
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bool doHairline(const SkPoint&, const SkPoint&, const SkPaint&);
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bool doRect(const SkRect&, const SkPaint&);
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bool doPath(const SkPath&, const SkPaint&, bool doFill);
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void setClip(const SkRegion* clip) { fClip = clip; }
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const SkRegion* fClip;
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friend class SkAutoBounderCommit;
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friend class SkDraw;
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friend class SkDrawIter;
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friend struct Draw1Glyph;
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friend class SkMaskFilter;
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};
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#endif
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