SkCoreBlitters.h

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/*
 * 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 SkCoreBlitters_DEFINED
#define SkCoreBlitters_DEFINED
 
#include "include/core/SkColor.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkRefCnt.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkCPUTypes.h"
#include "src/core/SkBlitRow.h"
#include "src/core/SkBlitter.h"
#include "src/shaders/SkShaderBase.h"
 
#include <cstdint>
 
class SkArenaAlloc;
class SkMatrix;
class SkRasterPipeline;
class SkShader;
class SkSurfaceProps;
struct SkIRect;
struct SkMask;
 
class SkRasterBlitter : public SkBlitter {
public:
    SkRasterBlitter(const SkPixmap& device) : fDevice(device) {}
 
protected:
    const SkPixmap fDevice;
 
private:
    using INHERITED = SkBlitter;
};
 
class SkShaderBlitter : public SkRasterBlitter {
public:
    /**
      *  The storage for shaderContext is owned by the caller, but the object itself is not.
      *  The blitter only ensures that the storage always holds a live object, but it may
      *  exchange that object.
      */
    SkShaderBlitter(const SkPixmap& device, const SkPaint& paint,
                    SkShaderBase::Context* shaderContext);
    ~SkShaderBlitter() override;
 
protected:
    sk_sp<SkShader>         fShader;
    SkShaderBase::Context*  fShaderContext;
 
private:
    // illegal
    SkShaderBlitter& operator=(const SkShaderBlitter&);
 
    using INHERITED = SkRasterBlitter;
};
 
///////////////////////////////////////////////////////////////////////////////
 
class SkARGB32_Blitter : public SkRasterBlitter {
public:
    SkARGB32_Blitter(const SkPixmap& device, const SkPaint& paint);
    void blitH(int x, int y, int width) override;
    void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) override;
    void blitV(int x, int y, int height, SkAlpha alpha) override;
    void blitRect(int x, int y, int width, int height) override;
    void blitMask(const SkMask&, const SkIRect&) override;
    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
 
protected:
    SkColor                fColor;
    SkPMColor              fPMColor;
 
private:
    unsigned fSrcA, fSrcR, fSrcG, fSrcB;
 
    // illegal
    SkARGB32_Blitter& operator=(const SkARGB32_Blitter&);
 
    using INHERITED = SkRasterBlitter;
};
 
class SkARGB32_Opaque_Blitter : public SkARGB32_Blitter {
public:
    SkARGB32_Opaque_Blitter(const SkPixmap& device, const SkPaint& paint)
        : INHERITED(device, paint) { SkASSERT(paint.getAlpha() == 0xFF); }
    void blitMask(const SkMask&, const SkIRect&) override;
    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
 
private:
    using INHERITED = SkARGB32_Blitter;
};
 
class SkARGB32_Black_Blitter : public SkARGB32_Opaque_Blitter {
public:
    SkARGB32_Black_Blitter(const SkPixmap& device, const SkPaint& paint)
        : INHERITED(device, paint) {}
    void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) override;
    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
 
private:
    using INHERITED = SkARGB32_Opaque_Blitter;
};
 
class SkARGB32_Shader_Blitter : public SkShaderBlitter {
public:
    SkARGB32_Shader_Blitter(const SkPixmap& device, const SkPaint& paint,
                            SkShaderBase::Context* shaderContext);
    ~SkARGB32_Shader_Blitter() override;
    void blitH(int x, int y, int width) override;
    void blitV(int x, int y, int height, SkAlpha alpha) override;
    void blitRect(int x, int y, int width, int height) override;
    void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override;
    void blitMask(const SkMask&, const SkIRect&) override;
 
private:
    SkPMColor*          fBuffer;
    SkBlitRow::Proc32   fProc32;
    SkBlitRow::Proc32   fProc32Blend;
    bool                fShadeDirectlyIntoDevice;
 
    // illegal
    SkARGB32_Shader_Blitter& operator=(const SkARGB32_Shader_Blitter&);
 
    using INHERITED = SkShaderBlitter;
};
 
///////////////////////////////////////////////////////////////////////////////////////////////////
 
SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap&,
                                         const SkPaint&,
                                         const SkMatrix& ctm,
                                         SkArenaAlloc*,
                                         sk_sp<SkShader> clipShader,
                                         const SkSurfaceProps& props);
// Use this if you've pre-baked a shader pipeline, including modulating with paint alpha.
SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap&, const SkPaint&,
                                         const SkRasterPipeline& shaderPipeline,
                                         bool shader_is_opaque,
                                         SkArenaAlloc*, sk_sp<SkShader> clipShader);
 
#endif