1 // Copyright 2016 The PDFium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "core/fpdfdoc/cpdf_defaultappearance.h"
8
9 #include <algorithm>
10 #include <vector>
11
12 #include "core/fpdfapi/parser/cpdf_simple_parser.h"
13 #include "core/fpdfapi/parser/fpdf_parser_utility.h"
14 #include "core/fxcrt/fx_string.h"
15 #include "core/fxcrt/notreached.h"
16 #include "core/fxge/cfx_color.h"
17
18 namespace {
19
20 // Find the token and its |nParams| parameters from the start of data,
21 // and move the current position to the start of those parameters.
FindTagParamFromStart(CPDF_SimpleParser * parser,ByteStringView token,int nParams)22 bool FindTagParamFromStart(CPDF_SimpleParser* parser,
23 ByteStringView token,
24 int nParams) {
25 nParams++;
26
27 std::vector<uint32_t> pBuf(nParams);
28 int buf_index = 0;
29 int buf_count = 0;
30
31 parser->SetCurrentPosition(0);
32 while (true) {
33 pBuf[buf_index++] = parser->GetCurrentPosition();
34 if (buf_index == nParams)
35 buf_index = 0;
36
37 buf_count++;
38 if (buf_count > nParams)
39 buf_count = nParams;
40
41 ByteStringView word = parser->GetWord();
42 if (word.IsEmpty())
43 return false;
44
45 if (word == token) {
46 if (buf_count < nParams)
47 continue;
48
49 parser->SetCurrentPosition(pBuf[buf_index]);
50 return true;
51 }
52 }
53 }
54
55 } // namespace
56
CPDF_DefaultAppearance(const ByteString & csDA)57 CPDF_DefaultAppearance::CPDF_DefaultAppearance(const ByteString& csDA)
58 : m_csDA(csDA) {}
59
60 CPDF_DefaultAppearance::CPDF_DefaultAppearance(
61 const CPDF_DefaultAppearance& cDA) = default;
62
63 CPDF_DefaultAppearance::~CPDF_DefaultAppearance() = default;
64
GetFont(float * fFontSize) const65 std::optional<ByteString> CPDF_DefaultAppearance::GetFont(
66 float* fFontSize) const {
67 *fFontSize = 0.0f;
68 if (m_csDA.IsEmpty())
69 return std::nullopt;
70
71 ByteString csFontNameTag;
72 CPDF_SimpleParser syntax(m_csDA.AsStringView().unsigned_span());
73 if (FindTagParamFromStart(&syntax, "Tf", 2)) {
74 csFontNameTag = ByteString(syntax.GetWord());
75 csFontNameTag.Delete(0, 1);
76 *fFontSize = StringToFloat(syntax.GetWord());
77 }
78 return PDF_NameDecode(csFontNameTag.AsStringView());
79 }
80
GetColor() const81 std::optional<CFX_Color> CPDF_DefaultAppearance::GetColor() const {
82 if (m_csDA.IsEmpty())
83 return std::nullopt;
84
85 CPDF_SimpleParser syntax(m_csDA.AsStringView().unsigned_span());
86 if (FindTagParamFromStart(&syntax, "g", 1)) {
87 float gray = StringToFloat(syntax.GetWord());
88 return CFX_Color(CFX_Color::Type::kGray, gray);
89 }
90 if (FindTagParamFromStart(&syntax, "rg", 3)) {
91 float r = StringToFloat(syntax.GetWord());
92 float g = StringToFloat(syntax.GetWord());
93 float b = StringToFloat(syntax.GetWord());
94 return CFX_Color(CFX_Color::Type::kRGB, r, g, b);
95 }
96 if (FindTagParamFromStart(&syntax, "k", 4)) {
97 float c = StringToFloat(syntax.GetWord());
98 float m = StringToFloat(syntax.GetWord());
99 float y = StringToFloat(syntax.GetWord());
100 float k = StringToFloat(syntax.GetWord());
101 return CFX_Color(CFX_Color::Type::kCMYK, c, m, y, k);
102 }
103 return std::nullopt;
104 }
105
GetColorARGB() const106 std::optional<CFX_Color::TypeAndARGB> CPDF_DefaultAppearance::GetColorARGB()
107 const {
108 std::optional<CFX_Color> maybe_color = GetColor();
109 if (!maybe_color.has_value())
110 return std::nullopt;
111
112 const CFX_Color& color = maybe_color.value();
113 if (color.nColorType == CFX_Color::Type::kGray) {
114 int g = static_cast<int>(color.fColor1 * 255 + 0.5f);
115 return CFX_Color::TypeAndARGB(CFX_Color::Type::kGray,
116 ArgbEncode(255, g, g, g));
117 }
118 if (color.nColorType == CFX_Color::Type::kRGB) {
119 int r = static_cast<int>(color.fColor1 * 255 + 0.5f);
120 int g = static_cast<int>(color.fColor2 * 255 + 0.5f);
121 int b = static_cast<int>(color.fColor3 * 255 + 0.5f);
122 return CFX_Color::TypeAndARGB(CFX_Color::Type::kRGB,
123 ArgbEncode(255, r, g, b));
124 }
125 if (color.nColorType == CFX_Color::Type::kCMYK) {
126 float r = 1.0f - std::min(1.0f, color.fColor1 + color.fColor4);
127 float g = 1.0f - std::min(1.0f, color.fColor2 + color.fColor4);
128 float b = 1.0f - std::min(1.0f, color.fColor3 + color.fColor4);
129 return CFX_Color::TypeAndARGB(
130 CFX_Color::Type::kCMYK,
131 ArgbEncode(255, static_cast<int>(r * 255 + 0.5f),
132 static_cast<int>(g * 255 + 0.5f),
133 static_cast<int>(b * 255 + 0.5f)));
134 }
135 NOTREACHED_NORETURN();
136 }
137
138 // static
FindTagParamFromStartForTesting(CPDF_SimpleParser * parser,ByteStringView token,int nParams)139 bool CPDF_DefaultAppearance::FindTagParamFromStartForTesting(
140 CPDF_SimpleParser* parser,
141 ByteStringView token,
142 int nParams) {
143 return FindTagParamFromStart(parser, token, nParams);
144 }
145