1 /*
2 * Copyright 2011 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 #ifndef SkPDFUtils_DEFINED
8 #define SkPDFUtils_DEFINED
9
10 #include "include/core/SkPaint.h"
11 #include "include/core/SkPath.h"
12 #include "include/core/SkShader.h"
13 #include "include/core/SkStream.h"
14 #include "src/core/SkUtils.h"
15 #include "src/pdf/SkPDFTypes.h"
16 #include "src/shaders/SkShaderBase.h"
17 #include "src/utils/SkFloatToDecimal.h"
18
19 class SkMatrix;
20 class SkPDFArray;
21 struct SkRect;
22
23 template <typename T>
SkPackedArrayEqual(T * u,T * v,size_t n)24 bool SkPackedArrayEqual(T* u, T* v, size_t n) {
25 SkASSERT(u);
26 SkASSERT(v);
27 return 0 == memcmp(u, v, n * sizeof(T));
28 }
29
30 #if 0
31 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
32 #else
33 #define PRINT_NOT_IMPL(str)
34 #endif
35
36 #define NOT_IMPLEMENTED(condition, assert) \
37 do { \
38 if ((bool)(condition)) { \
39 PRINT_NOT_IMPL("NOT_IMPLEMENTED: " #condition "\n"); \
40 SkDEBUGCODE(SkASSERT(!assert);) \
41 } \
42 } while (0)
43
44 namespace SkPDFUtils {
45
46 const char* BlendModeName(SkBlendMode);
47
48 std::unique_ptr<SkPDFArray> RectToArray(const SkRect& rect);
49 std::unique_ptr<SkPDFArray> MatrixToArray(const SkMatrix& matrix);
50
51 void MoveTo(SkScalar x, SkScalar y, SkWStream* content);
52 void AppendLine(SkScalar x, SkScalar y, SkWStream* content);
53 void AppendRectangle(const SkRect& rect, SkWStream* content);
54 void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
55 bool doConsumeDegerates, SkWStream* content, SkScalar tolerance = 0.25f);
56 inline void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
57 SkWStream* content, SkScalar tolerance = 0.25f) {
58 SkPDFUtils::EmitPath(path, paintStyle, true, content, tolerance);
59 }
60 void ClosePath(SkWStream* content);
61 void PaintPath(SkPaint::Style style, SkPath::FillType fill,
62 SkWStream* content);
63 void StrokePath(SkWStream* content);
64 void ApplyGraphicState(int objectIndex, SkWStream* content);
65 void ApplyPattern(int objectIndex, SkWStream* content);
66
67 // Converts (value / 255.0) with three significant digits of accuracy.
68 // Writes value as string into result. Returns strlen() of result.
69 size_t ColorToDecimal(uint8_t value, char result[5]);
70
71 static constexpr unsigned kFloatColorDecimalCount = 4;
72 size_t ColorToDecimalF(float value, char result[kFloatColorDecimalCount + 2]);
AppendColorComponent(uint8_t value,SkWStream * wStream)73 inline void AppendColorComponent(uint8_t value, SkWStream* wStream) {
74 char buffer[5];
75 size_t len = SkPDFUtils::ColorToDecimal(value, buffer);
76 wStream->write(buffer, len);
77 }
AppendColorComponentF(float value,SkWStream * wStream)78 inline void AppendColorComponentF(float value, SkWStream* wStream) {
79 char buffer[kFloatColorDecimalCount + 2];
80 size_t len = SkPDFUtils::ColorToDecimalF(value, buffer);
81 wStream->write(buffer, len);
82 }
83
AppendScalar(SkScalar value,SkWStream * stream)84 inline void AppendScalar(SkScalar value, SkWStream* stream) {
85 char result[kMaximumSkFloatToDecimalLength];
86 size_t len = SkFloatToDecimal(SkScalarToFloat(value), result);
87 SkASSERT(len < kMaximumSkFloatToDecimalLength);
88 stream->write(result, len);
89 }
90
WriteUInt16BE(SkDynamicMemoryWStream * wStream,uint16_t value)91 inline void WriteUInt16BE(SkDynamicMemoryWStream* wStream, uint16_t value) {
92 char result[4] = { SkHexadecimalDigits::gUpper[ value >> 12 ],
93 SkHexadecimalDigits::gUpper[0xF & (value >> 8 )],
94 SkHexadecimalDigits::gUpper[0xF & (value >> 4 )],
95 SkHexadecimalDigits::gUpper[0xF & (value )] };
96 wStream->write(result, 4);
97 }
98
WriteUInt8(SkDynamicMemoryWStream * wStream,uint8_t value)99 inline void WriteUInt8(SkDynamicMemoryWStream* wStream, uint8_t value) {
100 char result[2] = { SkHexadecimalDigits::gUpper[value >> 4],
101 SkHexadecimalDigits::gUpper[value & 0xF] };
102 wStream->write(result, 2);
103 }
104
WriteUTF16beHex(SkDynamicMemoryWStream * wStream,SkUnichar utf32)105 inline void WriteUTF16beHex(SkDynamicMemoryWStream* wStream, SkUnichar utf32) {
106 uint16_t utf16[2] = {0, 0};
107 size_t len = SkUTF::ToUTF16(utf32, utf16);
108 SkASSERT(len == 1 || len == 2);
109 SkPDFUtils::WriteUInt16BE(wStream, utf16[0]);
110 if (len == 2) {
111 SkPDFUtils::WriteUInt16BE(wStream, utf16[1]);
112 }
113 }
114
GetShaderLocalMatrix(const SkShader * shader)115 inline SkMatrix GetShaderLocalMatrix(const SkShader* shader) {
116 SkMatrix localMatrix;
117 if (sk_sp<SkShader> s = as_SB(shader)->makeAsALocalMatrixShader(&localMatrix)) {
118 return SkMatrix::Concat(as_SB(s)->getLocalMatrix(), localMatrix);
119 }
120 return as_SB(shader)->getLocalMatrix();
121 }
122 bool InverseTransformBBox(const SkMatrix& matrix, SkRect* bbox);
123 void PopulateTilingPatternDict(SkPDFDict* pattern,
124 SkRect& bbox,
125 std::unique_ptr<SkPDFDict> resources,
126 const SkMatrix& matrix);
127
128 bool ToBitmap(const SkImage* img, SkBitmap* dst);
129
130 #ifdef SK_PDF_BASE85_BINARY
131 void Base85Encode(std::unique_ptr<SkStreamAsset> src, SkDynamicMemoryWStream* dst);
132 #endif // SK_PDF_BASE85_BINARY
133
134 void AppendTransform(const SkMatrix&, SkWStream*);
135 } // namespace SkPDFUtils
136
137 #endif
138