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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorSpaceXform.h"
#include "SkData.h"
#include "SkMakeUnique.h"
#include "skcms.h"
class SkColorSpaceXform_skcms : public SkColorSpaceXform {
public:
SkColorSpaceXform_skcms(const skcms_ICCProfile& srcProfile,
const skcms_ICCProfile& dstProfile,
skcms_AlphaFormat premulFormat)
: fSrcProfile(srcProfile)
, fDstProfile(dstProfile)
, fPremulFormat(premulFormat)
{}
bool apply(ColorFormat, void*, ColorFormat, const void*, int, SkAlphaType) const override;
private:
skcms_ICCProfile fSrcProfile;
skcms_ICCProfile fDstProfile;
skcms_AlphaFormat fPremulFormat;
};
static skcms_PixelFormat get_skcms_format(SkColorSpaceXform::ColorFormat fmt) {
switch (fmt) {
case SkColorSpaceXform::kRGBA_8888_ColorFormat:
return skcms_PixelFormat_RGBA_8888;
case SkColorSpaceXform::kBGRA_8888_ColorFormat:
return skcms_PixelFormat_BGRA_8888;
case SkColorSpaceXform::kRGB_U16_BE_ColorFormat:
return skcms_PixelFormat_RGB_161616;
case SkColorSpaceXform::kRGBA_U16_BE_ColorFormat:
return skcms_PixelFormat_RGBA_16161616;
case SkColorSpaceXform::kRGBA_F16_ColorFormat:
return skcms_PixelFormat_RGBA_hhhh;
case SkColorSpaceXform::kRGBA_F32_ColorFormat:
return skcms_PixelFormat_RGBA_ffff;
case SkColorSpaceXform::kBGR_565_ColorFormat:
return skcms_PixelFormat_BGR_565;
default:
SkDEBUGFAIL("Invalid ColorFormat");
return skcms_PixelFormat_RGBA_8888;
}
}
bool SkColorSpaceXform_skcms::apply(ColorFormat dstFormat, void* dst,
ColorFormat srcFormat, const void* src,
int count, SkAlphaType alphaType) const {
skcms_AlphaFormat srcAlpha = skcms_AlphaFormat_Unpremul;
skcms_AlphaFormat dstAlpha = kPremul_SkAlphaType == alphaType ? fPremulFormat
: skcms_AlphaFormat_Unpremul;
return skcms_Transform(src, get_skcms_format(srcFormat), srcAlpha, &fSrcProfile,
dst, get_skcms_format(dstFormat), dstAlpha, &fDstProfile, count);
}
static bool cs_to_profile(const SkColorSpace* cs, skcms_ICCProfile* profile) {
if (cs->profileData()) {
bool result = skcms_Parse(cs->profileData()->data(), cs->profileData()->size(), profile);
// We shouldn't encounter color spaces that were constructed from invalid profiles!
SkASSERT(result);
return result;
}
SkMatrix44 toXYZ;
SkColorSpaceTransferFn tf;
if (cs->toXYZD50(&toXYZ) && cs->isNumericalTransferFn(&tf)) {
memset(profile, 0, sizeof(*profile));
profile->has_trc = true;
profile->trc[0].parametric.g = tf.fG;
profile->trc[0].parametric.a = tf.fA;
profile->trc[0].parametric.b = tf.fB;
profile->trc[0].parametric.c = tf.fC;
profile->trc[0].parametric.d = tf.fD;
profile->trc[0].parametric.e = tf.fE;
profile->trc[0].parametric.f = tf.fF;
profile->trc[1].parametric = profile->trc[0].parametric;
profile->trc[2].parametric = profile->trc[0].parametric;
profile->has_toXYZD50 = true;
for (int r = 0; r < 3; ++r) {
for (int c = 0; c < 3; ++c) {
profile->toXYZD50.vals[r][c] = toXYZ.get(r, c);
}
}
return true;
}
// It should be impossible to make a color space that gets here with our available factories.
// All ICC-based profiles have profileData. All remaining factories produce XYZ spaces with
// a single (numerical) transfer function.
SkDEBUGFAIL("How did we get here?");
return false;
}
std::unique_ptr<SkColorSpaceXform> MakeSkcmsXform(SkColorSpace* src, SkColorSpace* dst,
SkTransferFunctionBehavior premulBehavior) {
// Construct skcms_ICCProfiles from each color space. For now, support A2B and XYZ.
// Eventually, only need to support XYZ. Map premulBehavior to one of the two premul formats
// in skcms.
skcms_ICCProfile srcProfile, dstProfile;
if (!cs_to_profile(src, &srcProfile) || !cs_to_profile(dst, &dstProfile)) {
return nullptr;
}
skcms_AlphaFormat premulFormat = SkTransferFunctionBehavior::kRespect == premulBehavior
? skcms_AlphaFormat_PremulLinear : skcms_AlphaFormat_PremulAsEncoded;
return skstd::make_unique<SkColorSpaceXform_skcms>(srcProfile, dstProfile, premulFormat);
}
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