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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkData.h"
#include "SkPaint.h"
#include "SkPDFCanon.h"
#include "SkPDFFormXObject.h"
#include "SkPDFGraphicState.h"
#include "SkPDFUtils.h"
static const char* as_pdf_blend_mode_name(SkBlendMode mode) {
// PDF32000.book section 11.3.5 "Blend Mode"
switch (mode) {
case SkBlendMode::kScreen: return "Screen";
case SkBlendMode::kOverlay: return "Overlay";
case SkBlendMode::kDarken: return "Darken";
case SkBlendMode::kLighten: return "Lighten";
case SkBlendMode::kColorDodge: return "ColorDodge";
case SkBlendMode::kColorBurn: return "ColorBurn";
case SkBlendMode::kHardLight: return "HardLight";
case SkBlendMode::kSoftLight: return "SoftLight";
case SkBlendMode::kDifference: return "Difference";
case SkBlendMode::kExclusion: return "Exclusion";
case SkBlendMode::kMultiply: return "Multiply";
case SkBlendMode::kHue: return "Hue";
case SkBlendMode::kSaturation: return "Saturation";
case SkBlendMode::kColor: return "Color";
case SkBlendMode::kLuminosity: return "Luminosity";
// Other blendmodes are either unsupported or handled in
// SkPDFDevice::setUpContentEntry.
default: return "Normal";
}
}
static int to_stroke_cap(uint8_t cap) {
// PDF32000.book section 8.4.3.3 "Line Cap Style"
switch ((SkPaint::Cap)cap) {
case SkPaint::kButt_Cap: return 0;
case SkPaint::kRound_Cap: return 1;
case SkPaint::kSquare_Cap: return 2;
default: SkASSERT(false); return 0;
}
}
static int to_stroke_join(uint8_t join) {
// PDF32000.book section 8.4.3.4 "Line Join Style"
switch ((SkPaint::Join)join) {
case SkPaint::kMiter_Join: return 0;
case SkPaint::kRound_Join: return 1;
case SkPaint::kBevel_Join: return 2;
default: SkASSERT(false); return 0;
}
}
// If a SkXfermode is unsupported in PDF, this function returns
// SrcOver, otherwise, it returns that Xfermode as a Mode.
static uint8_t pdf_blend_mode(SkBlendMode mode) {
switch (mode) {
case SkBlendMode::kSrcOver:
case SkBlendMode::kMultiply:
case SkBlendMode::kScreen:
case SkBlendMode::kOverlay:
case SkBlendMode::kDarken:
case SkBlendMode::kLighten:
case SkBlendMode::kColorDodge:
case SkBlendMode::kColorBurn:
case SkBlendMode::kHardLight:
case SkBlendMode::kSoftLight:
case SkBlendMode::kDifference:
case SkBlendMode::kExclusion:
case SkBlendMode::kHue:
case SkBlendMode::kSaturation:
case SkBlendMode::kColor:
case SkBlendMode::kLuminosity:
return SkToU8((unsigned)mode);
default:
return SkToU8((unsigned)SkBlendMode::kSrcOver);
}
}
sk_sp<SkPDFDict> SkPDFGraphicState::GetGraphicStateForPaint(SkPDFCanon* canon,
const SkPaint& p) {
SkASSERT(canon);
if (SkPaint::kFill_Style == p.getStyle()) {
SkPDFFillGraphicState fillKey = {p.getAlpha(), pdf_blend_mode(p.getBlendMode())};
auto& fillMap = canon->fFillGSMap;
if (sk_sp<SkPDFDict>* statePtr = fillMap.find(fillKey)) {
return *statePtr;
}
auto state = sk_make_sp<SkPDFDict>();
state->reserve(2);
state->insertScalar("ca", fillKey.fAlpha / 255.0f);
state->insertName("BM", as_pdf_blend_mode_name((SkBlendMode)fillKey.fBlendMode));
fillMap.set(fillKey, state);
return state;
} else {
SkPDFStrokeGraphicState strokeKey = {
p.getStrokeWidth(), p.getStrokeMiter(),
SkToU8(p.getStrokeCap()), SkToU8(p.getStrokeJoin()),
p.getAlpha(), pdf_blend_mode(p.getBlendMode())};
auto& sMap = canon->fStrokeGSMap;
if (sk_sp<SkPDFDict>* statePtr = sMap.find(strokeKey)) {
return *statePtr;
}
auto state = sk_make_sp<SkPDFDict>();
state->reserve(8);
state->insertScalar("CA", strokeKey.fAlpha / 255.0f);
state->insertScalar("ca", strokeKey.fAlpha / 255.0f);
state->insertInt("LC", to_stroke_cap(strokeKey.fStrokeCap));
state->insertInt("LJ", to_stroke_join(strokeKey.fStrokeJoin));
state->insertScalar("LW", strokeKey.fStrokeWidth);
state->insertScalar("ML", strokeKey.fStrokeMiter);
state->insertBool("SA", true); // SA = Auto stroke adjustment.
state->insertName("BM", as_pdf_blend_mode_name((SkBlendMode)strokeKey.fBlendMode));
sMap.set(strokeKey, state);
return state;
}
}
////////////////////////////////////////////////////////////////////////////////
static sk_sp<SkPDFStream> make_invert_function() {
// Acrobat crashes if we use a type 0 function, kpdf crashes if we use
// a type 2 function, so we use a type 4 function.
auto domainAndRange = sk_make_sp<SkPDFArray>();
domainAndRange->reserve(2);
domainAndRange->appendInt(0);
domainAndRange->appendInt(1);
static const char psInvert[] = "{1 exch sub}";
// Do not copy the trailing '\0' into the SkData.
auto invertFunction = sk_make_sp<SkPDFStream>(
SkData::MakeWithoutCopy(psInvert, strlen(psInvert)));
invertFunction->dict()->insertInt("FunctionType", 4);
invertFunction->dict()->insertObject("Domain", domainAndRange);
invertFunction->dict()->insertObject("Range", std::move(domainAndRange));
return invertFunction;
}
sk_sp<SkPDFDict> SkPDFGraphicState::GetSMaskGraphicState(
sk_sp<SkPDFObject> sMask,
bool invert,
SkPDFSMaskMode sMaskMode,
SkPDFCanon* canon) {
// The practical chances of using the same mask more than once are unlikely
// enough that it's not worth canonicalizing.
auto sMaskDict = sk_make_sp<SkPDFDict>("Mask");
if (sMaskMode == kAlpha_SMaskMode) {
sMaskDict->insertName("S", "Alpha");
} else if (sMaskMode == kLuminosity_SMaskMode) {
sMaskDict->insertName("S", "Luminosity");
}
sMaskDict->insertObjRef("G", std::move(sMask));
if (invert) {
// Instead of calling SkPDFGraphicState::MakeInvertFunction,
// let the canon deduplicate this object.
sk_sp<SkPDFStream>& invertFunction = canon->fInvertFunction;
if (!invertFunction) {
invertFunction = make_invert_function();
}
sMaskDict->insertObjRef("TR", invertFunction);
}
auto result = sk_make_sp<SkPDFDict>("ExtGState");
result->insertObject("SMask", std::move(sMaskDict));
return result;
}
|
