144 lines
4.9 KiB
C++
144 lines
4.9 KiB
C++
/* libs/graphics/sgl/SkBlitter.h
|
|
**
|
|
** Copyright 2006, The Android Open Source Project
|
|
**
|
|
** Licensed under the Apache License, Version 2.0 (the "License");
|
|
** you may not use this file except in compliance with the License.
|
|
** You may obtain a copy of the License at
|
|
**
|
|
** http://www.apache.org/licenses/LICENSE-2.0
|
|
**
|
|
** Unless required by applicable law or agreed to in writing, software
|
|
** distributed under the License is distributed on an "AS IS" BASIS,
|
|
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
** See the License for the specific language governing permissions and
|
|
** limitations under the License.
|
|
*/
|
|
|
|
#ifndef SkBlitter_DEFINED
|
|
#define SkBlitter_DEFINED
|
|
|
|
#include "SkBitmap.h"
|
|
#include "SkMatrix.h"
|
|
#include "SkPaint.h"
|
|
#include "SkRefCnt.h"
|
|
#include "SkRegion.h"
|
|
#include "SkMask.h"
|
|
|
|
class SkBlitter {
|
|
public:
|
|
virtual ~SkBlitter();
|
|
|
|
virtual void blitH(int x, int y, int width);
|
|
virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
|
|
virtual void blitV(int x, int y, int height, SkAlpha alpha);
|
|
virtual void blitRect(int x, int y, int width, int height);
|
|
virtual void blitMask(const SkMask&, const SkIRect& clip);
|
|
|
|
/* If the blitter just sets a single value for each pixel, return the
|
|
bitmap it draws into, and assign value. If not, return NULL and ignore
|
|
the value parameter.
|
|
*/
|
|
virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
|
|
|
|
// not virtual, just helpers
|
|
void blitMaskRegion(const SkMask& mask, const SkRegion& clip);
|
|
void blitRectRegion(const SkIRect& rect, const SkRegion& clip);
|
|
void blitRegion(const SkRegion& clip);
|
|
|
|
// factories
|
|
static SkBlitter* Choose(const SkBitmap& device,
|
|
const SkMatrix& matrix,
|
|
const SkPaint& paint) {
|
|
return Choose(device, matrix, paint, NULL, 0);
|
|
}
|
|
|
|
static SkBlitter* Choose(const SkBitmap& device,
|
|
const SkMatrix& matrix,
|
|
const SkPaint& paint,
|
|
void* storage, size_t storageSize);
|
|
|
|
static SkBlitter* ChooseSprite(const SkBitmap& device,
|
|
const SkPaint&,
|
|
const SkBitmap& src,
|
|
int left, int top,
|
|
void* storage, size_t storageSize);
|
|
|
|
private:
|
|
};
|
|
|
|
/** This blitter silently never draws anything.
|
|
*/
|
|
class SkNullBlitter : public SkBlitter {
|
|
public:
|
|
virtual void blitH(int x, int y, int width);
|
|
virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
|
|
virtual void blitV(int x, int y, int height, SkAlpha alpha);
|
|
virtual void blitRect(int x, int y, int width, int height);
|
|
virtual void blitMask(const SkMask&, const SkIRect& clip);
|
|
virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
|
|
};
|
|
|
|
/** Wraps another (real) blitter, and ensures that the real blitter is only
|
|
called with coordinates that have been clipped by the specified clipRect.
|
|
This means the caller need not perform the clipping ahead of time.
|
|
*/
|
|
class SkRectClipBlitter : public SkBlitter {
|
|
public:
|
|
void init(SkBlitter* blitter, const SkIRect& clipRect) {
|
|
SkASSERT(!clipRect.isEmpty());
|
|
fBlitter = blitter;
|
|
fClipRect = clipRect;
|
|
}
|
|
|
|
// overrides
|
|
virtual void blitH(int x, int y, int width);
|
|
virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
|
|
virtual void blitV(int x, int y, int height, SkAlpha alpha);
|
|
virtual void blitRect(int x, int y, int width, int height);
|
|
virtual void blitMask(const SkMask&, const SkIRect& clip);
|
|
virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
|
|
|
|
private:
|
|
SkBlitter* fBlitter;
|
|
SkIRect fClipRect;
|
|
};
|
|
|
|
/** Wraps another (real) blitter, and ensures that the real blitter is only
|
|
called with coordinates that have been clipped by the specified clipRgn.
|
|
This means the caller need not perform the clipping ahead of time.
|
|
*/
|
|
class SkRgnClipBlitter : public SkBlitter {
|
|
public:
|
|
void init(SkBlitter* blitter, const SkRegion* clipRgn) {
|
|
SkASSERT(clipRgn && !clipRgn->isEmpty());
|
|
fBlitter = blitter;
|
|
fRgn = clipRgn;
|
|
}
|
|
|
|
// overrides
|
|
virtual void blitH(int x, int y, int width);
|
|
virtual void blitAntiH(int x, int y, const SkAlpha[], const int16_t runs[]);
|
|
virtual void blitV(int x, int y, int height, SkAlpha alpha);
|
|
virtual void blitRect(int x, int y, int width, int height);
|
|
virtual void blitMask(const SkMask&, const SkIRect& clip);
|
|
virtual const SkBitmap* justAnOpaqueColor(uint32_t* value);
|
|
|
|
private:
|
|
SkBlitter* fBlitter;
|
|
const SkRegion* fRgn;
|
|
};
|
|
|
|
class SkBlitterClipper {
|
|
public:
|
|
SkBlitter* apply(SkBlitter* blitter, const SkRegion* clip,
|
|
const SkIRect* bounds = NULL);
|
|
|
|
private:
|
|
SkNullBlitter fNullBlitter;
|
|
SkRectClipBlitter fRectBlitter;
|
|
SkRgnClipBlitter fRgnBlitter;
|
|
};
|
|
|
|
#endif
|