src/core/SkBitmapProcShader.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 SkBitmapProcShader_DEFINED
#define SkBitmapProcShader_DEFINED

#include "SkImagePriv.h"
#include "SkShader.h"
#include "SkSmallAllocator.h"

struct SkBitmapProcState;
class SkBitmapProvider;

class SkBitmapProcLegacyShader : public SkShader {
private:
    friend class SkImageShader;

    static size_t ContextSize(const ContextRec&, const SkImageInfo& srcInfo);
    static Context* MakeContext(const SkShader&, TileMode tmx, TileMode tmy,
                                const SkBitmapProvider&, const ContextRec&, void* storage);

    typedef SkShader INHERITED;
};

enum {kSkBlitterContextSize = 3332};

// Commonly used allocator. It currently is only used to allocate up to 3 objects. The total
// bytes requested is calculated using one of our large shaders, its context size plus the size of
// an Sk3DBlitter in SkDraw.cpp
// Note that some contexts may contain other contexts (e.g. for compose shaders), but we've not
// yet found a situation where the size below isn't big enough.
typedef SkSmallAllocator<3, kSkBlitterContextSize> SkTBlitterAllocator;

// If alloc is non-nullptr, it will be used to allocate the returned SkShader, and MUST outlive
// the SkShader.
sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode,
                                   const SkMatrix* localMatrix, SkCopyPixelsMode,
                                   SkTBlitterAllocator* alloc);

#endif