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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkColorPriv.h" |
| 9 #include "SkColorSpace_Base.h" |
| 10 #include "SkColorSpaceXform.h" |
| 11 |
| 12 bool compute_gamut_xform(SkMatrix44* srcToDst, const SkMatrix44& srcToXYZ, |
| 13 const SkMatrix44& dstToXYZ) { |
| 14 if (!dstToXYZ.invert(srcToDst)) { |
| 15 return false; |
| 16 } |
| 17 |
| 18 srcToDst->postConcat(srcToXYZ); |
| 19 return true; |
| 20 } |
| 21 |
| 22 std::unique_ptr<SkColorSpaceXform> SkColorSpaceXform::New(const sk_sp<SkColorSpa
ce>& srcSpace, |
| 23 const sk_sp<SkColorSpa
ce>& dstSpace) { |
| 24 if (!srcSpace || !dstSpace) { |
| 25 return nullptr; |
| 26 } |
| 27 |
| 28 if (as_CSB(srcSpace)->gammas()->isValues() && as_CSB(dstSpace)->gammas()->is
Values()) { |
| 29 SkMatrix44 srcToDst(SkMatrix44::kUninitialized_Constructor); |
| 30 if (!compute_gamut_xform(&srcToDst, srcSpace->xyz(), dstSpace->xyz())) { |
| 31 return nullptr; |
| 32 } |
| 33 |
| 34 float srcGammas[3]; |
| 35 float dstGammas[3]; |
| 36 srcGammas[0] = as_CSB(srcSpace)->gammas()->fRed.fValue; |
| 37 srcGammas[1] = as_CSB(srcSpace)->gammas()->fGreen.fValue; |
| 38 srcGammas[2] = as_CSB(srcSpace)->gammas()->fBlue.fValue; |
| 39 dstGammas[0] = 1.0f / as_CSB(dstSpace)->gammas()->fRed.fValue; |
| 40 dstGammas[1] = 1.0f / as_CSB(dstSpace)->gammas()->fGreen.fValue; |
| 41 dstGammas[2] = 1.0f / as_CSB(dstSpace)->gammas()->fBlue.fValue; |
| 42 |
| 43 return std::unique_ptr<SkColorSpaceXform>( |
| 44 new SkGammaByValueXform(srcGammas, srcToDst, dstGammas)); |
| 45 } |
| 46 |
| 47 // Unimplemeted |
| 48 return nullptr; |
| 49 } |
| 50 |
| 51 ////////////////////////////////////////////////////////////////////////////////
/////////////////// |
| 52 |
| 53 SkGammaByValueXform::SkGammaByValueXform(float srcGammas[3], const SkMatrix44& s
rcToDst, |
| 54 float dstGammas[3]) |
| 55 : fSrcToDst(srcToDst) |
| 56 { |
| 57 memcpy(fSrcGammas, srcGammas, 3 * sizeof(float)); |
| 58 memcpy(fDstGammas, dstGammas, 3 * sizeof(float)); |
| 59 } |
| 60 |
| 61 static uint8_t clamp_float_to_byte(float v) { |
| 62 v = v * 255.0f; |
| 63 if (v > 255.0f) { |
| 64 return 255; |
| 65 } else if (v <= 0.0f) { |
| 66 return 0; |
| 67 } else { |
| 68 return (uint8_t) (v + 0.5f); |
| 69 } |
| 70 } |
| 71 |
| 72 void SkGammaByValueXform::xform_RGBA_8888(uint32_t* dst, const uint32_t* src, ui
nt32_t len) const { |
| 73 while (len-- > 0) { |
| 74 float srcFloats[3]; |
| 75 srcFloats[0] = ((*src >> 0) & 0xFF) * (1.0f / 255.0f); |
| 76 srcFloats[1] = ((*src >> 8) & 0xFF) * (1.0f / 255.0f); |
| 77 srcFloats[2] = ((*src >> 16) & 0xFF) * (1.0f / 255.0f); |
| 78 |
| 79 // Convert to linear. |
| 80 srcFloats[0] = pow(srcFloats[0], fSrcGammas[0]); |
| 81 srcFloats[1] = pow(srcFloats[1], fSrcGammas[1]); |
| 82 srcFloats[2] = pow(srcFloats[2], fSrcGammas[2]); |
| 83 |
| 84 // Convert to dst gamut. |
| 85 float dstFloats[3]; |
| 86 dstFloats[0] = srcFloats[0] * fSrcToDst.getFloat(0, 0) + |
| 87 srcFloats[1] * fSrcToDst.getFloat(1, 0) + |
| 88 srcFloats[2] * fSrcToDst.getFloat(2, 0) + fSrcToDst.getFl
oat(3, 0); |
| 89 dstFloats[1] = srcFloats[0] * fSrcToDst.getFloat(0, 1) + |
| 90 srcFloats[1] * fSrcToDst.getFloat(1, 1) + |
| 91 srcFloats[2] * fSrcToDst.getFloat(2, 1) + fSrcToDst.getFl
oat(3, 1); |
| 92 dstFloats[2] = srcFloats[0] * fSrcToDst.getFloat(0, 2) + |
| 93 srcFloats[1] * fSrcToDst.getFloat(1, 2) + |
| 94 srcFloats[2] * fSrcToDst.getFloat(2, 2) + fSrcToDst.getFl
oat(3, 2); |
| 95 |
| 96 // Convert to dst gamma. |
| 97 dstFloats[0] = pow(dstFloats[0], fDstGammas[0]); |
| 98 dstFloats[1] = pow(dstFloats[1], fDstGammas[1]); |
| 99 dstFloats[2] = pow(dstFloats[2], fDstGammas[2]); |
| 100 |
| 101 *dst = SkPackARGB32NoCheck(((*src >> 24) & 0xFF), |
| 102 clamp_float_to_byte(dstFloats[0]), |
| 103 clamp_float_to_byte(dstFloats[1]), |
| 104 clamp_float_to_byte(dstFloats[2])); |
| 105 |
| 106 dst++; |
| 107 src++; |
| 108 } |
| 109 } |
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