mirror of https://github.com/axmolengine/axmol.git
145 lines
5.0 KiB
C++
145 lines
5.0 KiB
C++
/* libs/graphics/sgl/SkBlitter.h
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**
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** Copyright 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 SkBlitter_DEFINED
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#define SkBlitter_DEFINED
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#include "SkBitmap.h"
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#include "SkMatrix.h"
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#include "SkPaint.h"
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#include "SkRefCnt.h"
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#include "SkRegion.h"
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#include "SkMask.h"
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class SkBlitter {
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public:
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virtual ~SkBlitter();
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virtual void blitH(int x, int y, int width);
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virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
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const int16_t* runs);
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virtual void blitV(int x, int y, int height, SkAlpha alpha);
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virtual void blitRect(int x, int y, int width, int height);
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virtual void blitMask(const SkMask&, const SkIRect& clip);
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/* If the blitter just sets a single value for each pixel, return the
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bitmap it draws into, and assign value. If not, return NULL and ignore
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the value parameter.
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*/
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virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
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// not virtual, just helpers
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void blitMaskRegion(const SkMask& mask, const SkRegion& clip);
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void blitRectRegion(const SkIRect& rect, const SkRegion& clip);
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void blitRegion(const SkRegion& clip);
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// factories
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static SkBlitter* Choose(const SkBitmap& device,
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const SkMatrix& matrix,
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const SkPaint& paint) {
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return Choose(device, matrix, paint, NULL, 0);
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}
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static SkBlitter* Choose(const SkBitmap& device,
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const SkMatrix& matrix,
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const SkPaint& paint,
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void* storage, size_t storageSize);
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static SkBlitter* ChooseSprite(const SkBitmap& device,
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const SkPaint&,
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const SkBitmap& src,
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int left, int top,
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void* storage, size_t storageSize);
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private:
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};
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/** This blitter silently never draws anything.
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*/
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class SkNullBlitter : public SkBlitter {
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public:
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virtual void blitH(int x, int y, int width);
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virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
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virtual void blitV(int x, int y, int height, SkAlpha alpha);
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virtual void blitRect(int x, int y, int width, int height);
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virtual void blitMask(const SkMask&, const SkIRect& clip);
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virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
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};
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/** Wraps another (real) blitter, and ensures that the real blitter is only
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called with coordinates that have been clipped by the specified clipRect.
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This means the caller need not perform the clipping ahead of time.
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*/
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class SkRectClipBlitter : public SkBlitter {
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public:
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void init(SkBlitter* blitter, const SkIRect& clipRect) {
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SkASSERT(!clipRect.isEmpty());
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fBlitter = blitter;
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fClipRect = clipRect;
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}
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// overrides
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virtual void blitH(int x, int y, int width);
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virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
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virtual void blitV(int x, int y, int height, SkAlpha alpha);
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virtual void blitRect(int x, int y, int width, int height);
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virtual void blitMask(const SkMask&, const SkIRect& clip);
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virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
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private:
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SkBlitter* fBlitter;
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SkIRect fClipRect;
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};
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/** Wraps another (real) blitter, and ensures that the real blitter is only
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called with coordinates that have been clipped by the specified clipRgn.
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This means the caller need not perform the clipping ahead of time.
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*/
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class SkRgnClipBlitter : public SkBlitter {
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public:
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void init(SkBlitter* blitter, const SkRegion* clipRgn) {
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SkASSERT(clipRgn && !clipRgn->isEmpty());
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fBlitter = blitter;
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fRgn = clipRgn;
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}
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// overrides
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virtual void blitH(int x, int y, int width);
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virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
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virtual void blitV(int x, int y, int height, SkAlpha alpha);
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virtual void blitRect(int x, int y, int width, int height);
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virtual void blitMask(const SkMask&, const SkIRect& clip);
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virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
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private:
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SkBlitter* fBlitter;
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const SkRegion* fRgn;
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};
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class SkBlitterClipper {
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public:
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SkBlitter* apply(SkBlitter* blitter, const SkRegion* clip,
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const SkIRect* bounds = NULL);
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private:
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SkNullBlitter fNullBlitter;
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SkRectClipBlitter fRectBlitter;
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SkRgnClipBlitter fRgnBlitter;
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};
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#endif
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