1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPM4fPriv.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "SkString.h"
#include "SkToSRGBColorFilter.h"
#include "SkWriteBuffer.h"
#if SK_SUPPORT_GPU
#include "GrColorSpaceXform.h"
#endif
void SkToSRGBColorFilter::onAppendStages(SkRasterPipeline* p,
SkColorSpace* /*dst color space*/,
SkArenaAlloc* alloc,
bool shaderIsOpaque) const {
// Step 1: Linearize by undoing the src transfer function.
// Linear and sRGB will return true to isNumericalTransferFn(), so we check them first.
SkColorSpaceTransferFn srcFn;
if (fSrcColorSpace->gammaIsLinear()) {
// Nothing to do.
} else if (fSrcColorSpace->gammaCloseToSRGB()) {
p->append(SkRasterPipeline::from_srgb);
} else if (fSrcColorSpace->isNumericalTransferFn(&srcFn)) {
auto copy = alloc->make<SkColorSpaceTransferFn>(srcFn);
p->append(SkRasterPipeline::parametric, copy);
} else {
SkDEBUGFAIL("Looks like we got a table transfer function here, quite unexpectedly.");
// TODO: If we really need to handle this, we can, but I don't think Ganesh does.
}
// Step 2: Transform to sRGB gamut (without clamping).
append_gamut_transform(p,
alloc,
fSrcColorSpace.get(),
SkColorSpace::MakeSRGB().get(),
kPremul_SkAlphaType);
// Step 3: Back to sRGB encoding.
p->append(SkRasterPipeline::to_srgb);
}
sk_sp<SkColorFilter> SkToSRGBColorFilter::Make(sk_sp<SkColorSpace> srcColorSpace) {
if (!srcColorSpace || srcColorSpace->isSRGB()) {
return nullptr;
} else {
return sk_sp<SkColorFilter>(new SkToSRGBColorFilter(std::move(srcColorSpace)));
}
}
SkToSRGBColorFilter::SkToSRGBColorFilter(sk_sp<SkColorSpace> srcColorSpace)
: fSrcColorSpace(std::move(srcColorSpace)) {
SkASSERT(fSrcColorSpace);
}
sk_sp<SkFlattenable> SkToSRGBColorFilter::CreateProc(SkReadBuffer& buffer) {
auto data = buffer.readByteArrayAsData();
return data ? Make(SkColorSpace::Deserialize(data->data(), data->size())) : nullptr;
}
void SkToSRGBColorFilter::flatten(SkWriteBuffer& buffer) const {
buffer.writeDataAsByteArray(fSrcColorSpace->serialize().get());
}
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> SkToSRGBColorFilter::asFragmentProcessor(
GrContext*, const GrColorSpaceInfo&) const {
return GrColorSpaceXformEffect::Make(fSrcColorSpace.get(), SkColorSpace::MakeSRGB().get());
}
#endif
|
