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 "GrColor.h"
#include "GrSamplerParams.h"
#include "SkColor.h"
#include "SkColorPriv.h"
#include "SkFilterQuality.h"
#include "SkImageInfo.h"

class GrCaps;
class GrColorSpaceXform;
class GrContext;
class GrTexture;
class SkBitmap;

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

static inline GrColor SkColorToPremulGrColor(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);
}

static inline GrColor SkColorToUnpremulGrColor(SkColor c) {
    unsigned r = SkColorGetR(c);
    unsigned g = SkColorGetG(c);
    unsigned b = SkColorGetB(c);
    unsigned a = SkColorGetA(c);
    return GrColorPackRGBA(r, g, b, a);
}

/** Transform an SkColor (sRGB bytes) to GrColor4f for the specified color space. */
GrColor4f SkColorToPremulGrColor4f(SkColor c, SkColorSpace* dstColorSpace);
GrColor4f SkColorToUnpremulGrColor4f(SkColor c, SkColorSpace* dstColorSpace);

/**
 * As above, but with explicit control over the linearization and gamut xform steps.
 * Typically used when you have easy access to a pre-computed xform.
 */
GrColor4f SkColorToPremulGrColor4f(SkColor c, bool gammaCorrect, GrColorSpaceXform* gamutXform);
GrColor4f SkColorToUnpremulGrColor4f(SkColor c, bool gammaCorrect, GrColorSpaceXform* gamutXform);

static inline GrColor SkColorToOpaqueGrColor(SkColor c) {
    unsigned r = SkColorGetR(c);
    unsigned g = SkColorGetG(c);
    unsigned b = SkColorGetB(c);
    return GrColorPackRGBA(r, g, b, 0xFF);
}

/** Replicates the SkColor's alpha to all four channels of the GrColor. */
static inline GrColor SkColorAlphaToGrColor(SkColor c) {
    U8CPU a = SkColorGetA(c);
    return GrColorPackRGBA(a, a, a, a);
}

static inline SkPMColor GrColorToSkPMColor(GrColor c) {
    GrColorIsPMAssert(c);
    return SkPackARGB32(GrColorUnpackA(c), GrColorUnpackR(c), GrColorUnpackG(c), GrColorUnpackB(c));
}

static inline GrColor SkPMColorToGrColor(SkPMColor c) {
    return GrColorPackRGBA(SkGetPackedR32(c), SkGetPackedG32(c), SkGetPackedB32(c),
                           SkGetPackedA32(c));
}

////////////////////////////////////////////////////////////////////////////////
/** Returns a texture representing the bitmap that is compatible with the GrSamplerParams. The
    texture is inserted into the cache (unless the bitmap is marked volatile) and can be
    retrieved again via this function. */
GrTexture* GrRefCachedBitmapTexture(GrContext*, const SkBitmap&, const GrSamplerParams&);

sk_sp<GrTexture> GrMakeCachedBitmapTexture(GrContext*, const SkBitmap&, const GrSamplerParams&);

// TODO: Move SkImageInfo2GrPixelConfig to SkGrPriv.h (requires cleanup to SkWindow its subclasses).
GrPixelConfig SkImageInfo2GrPixelConfig(const SkImageInfo& info, const GrCaps& caps);

GrSamplerParams::FilterMode GrSkFilterQualityToGrFilterMode(SkFilterQuality paintFilterQuality,
                                                            const SkMatrix& viewM,
                                                            const SkMatrix& localM,
                                                            bool* doBicubic);

#endif