chromium/third_party/skia/src/core/SkBlitter.h

/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkBlitter_DEFINED
#define SkBlitter_DEFINED

#include "include/core/SkColor.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkRegion.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkCPUTypes.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkTo.h"
#include "src/base/SkAutoMalloc.h"

#include <cstddef>
#include <cstdint>

class SkArenaAlloc;
class SkMatrix;
class SkPaint;
class SkPixmap;
class SkShader;
class SkSurfaceProps;
struct SkMask;

/** SkBlitter and its subclasses are responsible for actually writing pixels
    into memory. Besides efficiency, they handle clipping and antialiasing.
    A SkBlitter subclass contains all the context needed to generate pixels
    for the destination and how src/generated pixels map to the destination.
    The coordinates passed to the blitX calls are in destination pixel space.
*/
class SkBlitter { … };

/** This blitter silently never draws anything.
*/
class SkNullBlitter : public SkBlitter { … };

/** 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 { … };

/** 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 { … };

#ifdef SK_DEBUG
class SkRectClipCheckBlitter : public SkBlitter { … };
#endif

/** Factory to set up the appropriate most-efficient wrapper blitter
    to apply a clip. Returns a pointer to a member, so lifetime must
    be managed carefully.
*/
class SkBlitterClipper { … };

// A good size for creating shader contexts on the stack.
enum { … };

#endif