GrSurface.h

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#ifndef GrSurface_DEFINED
#define GrSurface_DEFINED

#include "GrTypes.h"
#include "GrGpuResource.h"
#include "SkImageInfo.h"
#include "SkRect.h"

class GrRenderTarget;
class GrSurfacePriv;
class GrTexture;

class SK_API GrSurface : public GrGpuResource {
public:
    int width() const { return fDesc.fWidth; }

    int height() const { return fDesc.fHeight; }

    void getBoundsRect(SkRect* rect) const { rect->setWH(SkIntToScalar(this->width()),
                                                         SkIntToScalar(this->height())); }

    GrSurfaceOrigin origin() const {
        SkASSERT(kTopLeft_GrSurfaceOrigin == fDesc.fOrigin || kBottomLeft_GrSurfaceOrigin == fDesc.fOrigin);
        return fDesc.fOrigin;
    }

    GrPixelConfig config() const { return fDesc.fConfig; }

    const GrSurfaceDesc& desc() const { return fDesc; }

    virtual GrTexture* asTexture() { return NULL; }
    virtual const GrTexture* asTexture() const { return NULL; }

    virtual GrRenderTarget* asRenderTarget() { return NULL; }
    virtual const GrRenderTarget* asRenderTarget() const { return NULL; }

    bool readPixels(int left, int top, int width, int height,
                    GrPixelConfig config,
                    void* buffer,
                    size_t rowBytes = 0,
                    uint32_t pixelOpsFlags = 0);

    bool writePixels(int left, int top, int width, int height,
                     GrPixelConfig config,
                     const void* buffer,
                     size_t rowBytes = 0,
                     uint32_t pixelOpsFlags = 0);

    void flushWrites();

    inline GrSurfacePriv surfacePriv();
    inline const GrSurfacePriv surfacePriv() const;

    typedef void* ReleaseCtx;
    typedef void (*ReleaseProc)(ReleaseCtx);

    void setRelease(ReleaseProc proc, ReleaseCtx ctx) {
        fReleaseProc = proc;
        fReleaseCtx = ctx;
    }

    static size_t WorstCaseSize(const GrSurfaceDesc& desc);

protected:
    // Methods made available via GrSurfacePriv
    bool savePixels(const char* filename);
    bool hasPendingRead() const;
    bool hasPendingWrite() const;
    bool hasPendingIO() const;

    // Provides access to methods that should be public within Skia code.
    friend class GrSurfacePriv;

    GrSurface(GrGpu* gpu, const GrSurfaceDesc& desc)
        : INHERITED(gpu)
        , fDesc(desc)
        , fReleaseProc(NULL)
        , fReleaseCtx(NULL)
    {}

    ~GrSurface() override {
        // check that invokeReleaseProc has been called (if needed)
        SkASSERT(NULL == fReleaseProc);
    }

    GrSurfaceDesc fDesc;

    void onRelease() override;
    void onAbandon() override;

private:
    void invokeReleaseProc() {
        if (fReleaseProc) {
            fReleaseProc(fReleaseCtx);
            fReleaseProc = NULL;
        }
    }

    ReleaseProc fReleaseProc;
    ReleaseCtx  fReleaseCtx;

    typedef GrGpuResource INHERITED;
};

#endif