skia2/include/gpu/SkGr.h

/*
 * Copyright 2010 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */



#ifndef SkGr_DEFINED
#define SkGr_DEFINED

#include <stddef.h>

// Gr headers
#include "GrTypes.h"
#include "GrContext.h"
#include "GrFontScaler.h"

// skia headers
#include "SkBitmap.h"
#include "SkPath.h"
#include "SkPoint.h"
#include "SkRegion.h"
#include "SkClipStack.h"

////////////////////////////////////////////////////////////////////////////////
// Sk to Gr Type conversions

GR_STATIC_ASSERT((int)kZero_GrBlendCoeff == (int)SkXfermode::kZero_Coeff);
GR_STATIC_ASSERT((int)kOne_GrBlendCoeff  == (int)SkXfermode::kOne_Coeff);
GR_STATIC_ASSERT((int)kSC_GrBlendCoeff   == (int)SkXfermode::kSC_Coeff);
GR_STATIC_ASSERT((int)kISC_GrBlendCoeff  == (int)SkXfermode::kISC_Coeff);
GR_STATIC_ASSERT((int)kDC_GrBlendCoeff   == (int)SkXfermode::kDC_Coeff);
GR_STATIC_ASSERT((int)kIDC_GrBlendCoeff  == (int)SkXfermode::kIDC_Coeff);
GR_STATIC_ASSERT((int)kSA_GrBlendCoeff   == (int)SkXfermode::kSA_Coeff);
GR_STATIC_ASSERT((int)kISA_GrBlendCoeff  == (int)SkXfermode::kISA_Coeff);
GR_STATIC_ASSERT((int)kDA_GrBlendCoeff   == (int)SkXfermode::kDA_Coeff);
GR_STATIC_ASSERT((int)kIDA_GrBlendCoeff  == (int)SkXfermode::kIDA_Coeff);

#define sk_blend_to_grblend(X) ((GrBlendCoeff)(X))

///////////////////////////////////////////////////////////////////////////////

#include "SkColorPriv.h"

/**
 *  Convert the SkBitmap::Config to the corresponding PixelConfig, or
 *  kUnknown_PixelConfig if the conversion cannot be done.
 */
GrPixelConfig SkBitmapConfig2GrPixelConfig(SkBitmap::Config);
GrPixelConfig SkImageInfo2GrPixelConfig(SkColorType, SkAlphaType);

static inline GrPixelConfig SkImageInfo2GrPixelConfig(const SkImageInfo& info) {
    return SkImageInfo2GrPixelConfig(info.colorType(), info.alphaType());
}

bool GrPixelConfig2ColorType(GrPixelConfig, SkColorType*);

static inline GrColor SkColor2GrColor(SkColor c) {
    SkPMColor pm = SkPreMultiplyColor(c);
    unsigned r = SkGetPackedR32(pm);
    unsigned g = SkGetPackedG32(pm);
    unsigned b = SkGetPackedB32(pm);
    unsigned a = SkGetPackedA32(pm);
    return GrColorPackRGBA(r, g, b, a);
}

////////////////////////////////////////////////////////////////////////////////

bool GrIsBitmapInCache(const GrContext*, const SkBitmap&, const GrTextureParams*);

GrTexture* GrLockAndRefCachedBitmapTexture(GrContext*, const SkBitmap&, const GrTextureParams*);

void GrUnlockAndUnrefCachedBitmapTexture(GrTexture*);

////////////////////////////////////////////////////////////////////////////////

// Converts a SkPaint to a GrPaint, ignoring the SkPaint's shader.
// justAlpha indicates that the SkPaint's alpha should be used rather than the color.
// Callers may subsequently modify the GrPaint. Setting constantColor indicates
// that the final paint will draw the same color at every pixel. This allows
// an optimization where the the color filter can be applied to the SkPaint's
// color once while converting to GrPaint and then ignored.
void SkPaint2GrPaintNoShader(GrContext* context, const SkPaint& skPaint, bool justAlpha,
                             bool constantColor, GrPaint* grPaint);

// This function is similar to skPaint2GrPaintNoShader but also converts
// skPaint's shader to a GrTexture/GrEffectStage if possible.
// constantColor has the same meaning as in skPaint2GrPaintNoShader.
void SkPaint2GrPaintShader(GrContext* context, const SkPaint& skPaint,
                           bool constantColor, GrPaint* grPaint);

////////////////////////////////////////////////////////////////////////////////
// Classes

class SkGlyphCache;

class SkGrFontScaler : public GrFontScaler {
public:
    explicit SkGrFontScaler(SkGlyphCache* strike);
    virtual ~SkGrFontScaler();

    // overrides
    virtual const GrKey* getKey();
    virtual GrMaskFormat getMaskFormat();
    virtual bool getPackedGlyphBounds(GrGlyph::PackedID, SkIRect* bounds) SK_OVERRIDE;
    virtual bool getPackedGlyphImage(GrGlyph::PackedID, int width, int height,
                                     int rowBytes, void* image) SK_OVERRIDE;
    virtual bool getPackedGlyphDFBounds(GrGlyph::PackedID, SkIRect* bounds) SK_OVERRIDE;
    virtual bool getPackedGlyphDFImage(GrGlyph::PackedID, int width, int height,
                                       void* image) SK_OVERRIDE;
    virtual bool getGlyphPath(uint16_t glyphID, SkPath*);

private:
    SkGlyphCache* fStrike;
    GrKey*  fKey;
//    DECLARE_INSTANCE_COUNTER(SkGrFontScaler);
};

////////////////////////////////////////////////////////////////////////////////

#endif