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1 /* | 1 /* |
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> | 2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> |
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> | 3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> |
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org> | 4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org> |
5 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> | 5 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> |
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved. | 6 * Copyright (C) Research In Motion Limited 2010. All rights reserved. |
7 * Copyright (C) 2013 Google Inc. All rights reserved. | 7 * Copyright (C) 2013 Google Inc. All rights reserved. |
8 * | 8 * |
9 * This library is free software; you can redistribute it and/or | 9 * This library is free software; you can redistribute it and/or |
10 * modify it under the terms of the GNU Library General Public | 10 * modify it under the terms of the GNU Library General Public |
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21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | 21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 * Boston, MA 02110-1301, USA. | 22 * Boston, MA 02110-1301, USA. |
23 */ | 23 */ |
24 | 24 |
25 #include "platform/graphics/filters/FEComponentTransfer.h" | 25 #include "platform/graphics/filters/FEComponentTransfer.h" |
26 | 26 |
27 #include "SkColorFilterImageFilter.h" | 27 #include "SkColorFilterImageFilter.h" |
28 #include "SkTableColorFilter.h" | 28 #include "SkTableColorFilter.h" |
29 #include "platform/graphics/filters/SkiaImageFilterBuilder.h" | 29 #include "platform/graphics/filters/SkiaImageFilterBuilder.h" |
30 #include "platform/text/TextStream.h" | 30 #include "platform/text/TextStream.h" |
| 31 #include "wtf/MathExtras.h" |
| 32 #include <algorithm> |
31 | 33 |
32 namespace blink { | 34 namespace blink { |
33 | 35 |
34 typedef void (*TransferType)(unsigned char*, const ComponentTransferFunction&); | 36 typedef void (*TransferType)(unsigned char*, const ComponentTransferFunction&); |
35 | 37 |
36 FEComponentTransfer::FEComponentTransfer(Filter* filter, const ComponentTransfer
Function& redFunc, const ComponentTransferFunction& greenFunc, | 38 FEComponentTransfer::FEComponentTransfer(Filter* filter, const ComponentTransfer
Function& redFunc, const ComponentTransferFunction& greenFunc, |
37 const ComponentTransferFunction& blueFunc, const ComponentTransferFunction&
alphaFunc) | 39 const ComponentTransferFunction& blueFunc, const ComponentTransferFunction&
alphaFunc) |
38 : FilterEffect(filter) | 40 : FilterEffect(filter) |
39 , m_redFunc(redFunc) | 41 , m_redFunc(redFunc) |
40 , m_greenFunc(greenFunc) | 42 , m_greenFunc(greenFunc) |
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58 const Vector<float>& tableValues = transferFunction.tableValues; | 60 const Vector<float>& tableValues = transferFunction.tableValues; |
59 unsigned n = tableValues.size(); | 61 unsigned n = tableValues.size(); |
60 if (n < 1) | 62 if (n < 1) |
61 return; | 63 return; |
62 for (unsigned i = 0; i < 256; ++i) { | 64 for (unsigned i = 0; i < 256; ++i) { |
63 double c = i / 255.0; | 65 double c = i / 255.0; |
64 unsigned k = static_cast<unsigned>(c * (n - 1)); | 66 unsigned k = static_cast<unsigned>(c * (n - 1)); |
65 double v1 = tableValues[k]; | 67 double v1 = tableValues[k]; |
66 double v2 = tableValues[std::min((k + 1), (n - 1))]; | 68 double v2 = tableValues[std::min((k + 1), (n - 1))]; |
67 double val = 255.0 * (v1 + (c * (n - 1) - k) * (v2 - v1)); | 69 double val = 255.0 * (v1 + (c * (n - 1) - k) * (v2 - v1)); |
68 val = std::max(0.0, std::min(255.0, val)); | 70 val = clampTo(val, 0.0, 255.0); |
69 values[i] = static_cast<unsigned char>(val); | 71 values[i] = static_cast<unsigned char>(val); |
70 } | 72 } |
71 } | 73 } |
72 | 74 |
73 static void discrete(unsigned char* values, const ComponentTransferFunction& tra
nsferFunction) | 75 static void discrete(unsigned char* values, const ComponentTransferFunction& tra
nsferFunction) |
74 { | 76 { |
75 const Vector<float>& tableValues = transferFunction.tableValues; | 77 const Vector<float>& tableValues = transferFunction.tableValues; |
76 unsigned n = tableValues.size(); | 78 unsigned n = tableValues.size(); |
77 if (n < 1) | 79 if (n < 1) |
78 return; | 80 return; |
79 for (unsigned i = 0; i < 256; ++i) { | 81 for (unsigned i = 0; i < 256; ++i) { |
80 unsigned k = static_cast<unsigned>((i * n) / 255.0); | 82 unsigned k = static_cast<unsigned>((i * n) / 255.0); |
81 k = std::min(k, n - 1); | 83 k = std::min(k, n - 1); |
82 double val = 255 * tableValues[k]; | 84 double val = 255 * tableValues[k]; |
83 val = std::max(0.0, std::min(255.0, val)); | 85 val = clampTo(val, 0.0, 255.0); |
84 values[i] = static_cast<unsigned char>(val); | 86 values[i] = static_cast<unsigned char>(val); |
85 } | 87 } |
86 } | 88 } |
87 | 89 |
88 static void linear(unsigned char* values, const ComponentTransferFunction& trans
ferFunction) | 90 static void linear(unsigned char* values, const ComponentTransferFunction& trans
ferFunction) |
89 { | 91 { |
90 for (unsigned i = 0; i < 256; ++i) { | 92 for (unsigned i = 0; i < 256; ++i) { |
91 double val = transferFunction.slope * i + 255 * transferFunction.interce
pt; | 93 double val = transferFunction.slope * i + 255 * transferFunction.interce
pt; |
92 val = std::max(0.0, std::min(255.0, val)); | 94 val = clampTo(val, 0.0, 255.0); |
93 values[i] = static_cast<unsigned char>(val); | 95 values[i] = static_cast<unsigned char>(val); |
94 } | 96 } |
95 } | 97 } |
96 | 98 |
97 static void gamma(unsigned char* values, const ComponentTransferFunction& transf
erFunction) | 99 static void gamma(unsigned char* values, const ComponentTransferFunction& transf
erFunction) |
98 { | 100 { |
99 for (unsigned i = 0; i < 256; ++i) { | 101 for (unsigned i = 0; i < 256; ++i) { |
100 double exponent = transferFunction.exponent; // RCVT doesn't like passin
g a double and a float to pow, so promote this to double | 102 double exponent = transferFunction.exponent; // RCVT doesn't like passin
g a double and a float to pow, so promote this to double |
101 double val = 255.0 * (transferFunction.amplitude * pow((i / 255.0), expo
nent) + transferFunction.offset); | 103 double val = 255.0 * (transferFunction.amplitude * pow((i / 255.0), expo
nent) + transferFunction.offset); |
102 val = std::max(0.0, std::min(255.0, val)); | 104 val = clampTo(val, 0.0, 255.0); |
103 values[i] = static_cast<unsigned char>(val); | 105 values[i] = static_cast<unsigned char>(val); |
104 } | 106 } |
105 } | 107 } |
106 | 108 |
107 bool FEComponentTransfer::affectsTransparentPixels() | 109 bool FEComponentTransfer::affectsTransparentPixels() |
108 { | 110 { |
109 double intercept = 0; | 111 double intercept = 0; |
110 switch (m_alphaFunc.type) { | 112 switch (m_alphaFunc.type) { |
111 case FECOMPONENTTRANSFER_TYPE_UNKNOWN: | 113 case FECOMPONENTTRANSFER_TYPE_UNKNOWN: |
112 case FECOMPONENTTRANSFER_TYPE_IDENTITY: | 114 case FECOMPONENTTRANSFER_TYPE_IDENTITY: |
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201 ts << "{green: " << m_greenFunc << "}\n"; | 203 ts << "{green: " << m_greenFunc << "}\n"; |
202 writeIndent(ts, indent + 2); | 204 writeIndent(ts, indent + 2); |
203 ts << "{blue: " << m_blueFunc << "}\n"; | 205 ts << "{blue: " << m_blueFunc << "}\n"; |
204 writeIndent(ts, indent + 2); | 206 writeIndent(ts, indent + 2); |
205 ts << "{alpha: " << m_alphaFunc << "}]\n"; | 207 ts << "{alpha: " << m_alphaFunc << "}]\n"; |
206 inputEffect(0)->externalRepresentation(ts, indent + 1); | 208 inputEffect(0)->externalRepresentation(ts, indent + 1); |
207 return ts; | 209 return ts; |
208 } | 210 } |
209 | 211 |
210 } // namespace blink | 212 } // namespace blink |
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