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 "SkFloatToDecimal.h"
11 #include "SkPDFTypes.h"
12 #include "SkPaint.h"
13 #include "SkPath.h"
14 #include "SkShader.h"
15 #include "SkStream.h"
16 #include "SkUtils.h"
17
18 class SkMatrix;
19 class SkPDFArray;
20 struct SkRect;
21
22 template <typename T>
SkPackedArrayEqual(T * u,T * v,size_t n)23 bool SkPackedArrayEqual(T* u, T* v, size_t n) {
24 SkASSERT(u);
25 SkASSERT(v);
26 return 0 == memcmp(u, v, n * sizeof(T));
27 }
28
29 #if 0
30 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
31 #else
32 #define PRINT_NOT_IMPL(str)
33 #endif
34
35 #define NOT_IMPLEMENTED(condition, assert) \
36 do { \
37 if ((bool)(condition)) { \
38 PRINT_NOT_IMPL("NOT_IMPLEMENTED: " #condition "\n"); \
39 SkDEBUGCODE(SkASSERT(!assert);) \
40 } \
41 } while (0)
42
43 namespace SkPDFUtils {
44
45 constexpr float kDpiForRasterScaleOne = 72.0f;
46
47 sk_sp<SkPDFArray> RectToArray(const SkRect& rect);
48 sk_sp<SkPDFArray> MatrixToArray(const SkMatrix& matrix);
49 void AppendTransform(const SkMatrix& matrix, SkWStream* content);
50
51 void MoveTo(SkScalar x, SkScalar y, SkWStream* content);
52 void AppendLine(SkScalar x, SkScalar y, SkWStream* content);
53 void AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
54 SkScalar ctl2X, SkScalar ctl2Y,
55 SkScalar dstX, SkScalar dstY, SkWStream* content);
56 void AppendRectangle(const SkRect& rect, SkWStream* content);
57 void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
58 bool doConsumeDegerates, SkWStream* content, SkScalar tolerance = 0.25f);
59 inline void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
60 SkWStream* content, SkScalar tolerance = 0.25f) {
61 SkPDFUtils::EmitPath(path, paintStyle, true, content, tolerance);
62 }
63 void ClosePath(SkWStream* content);
64 void PaintPath(SkPaint::Style style, SkPath::FillType fill,
65 SkWStream* content);
66 void StrokePath(SkWStream* content);
67 void DrawFormXObject(int objectIndex, SkWStream* content);
68 void ApplyGraphicState(int objectIndex, SkWStream* content);
69 void ApplyPattern(int objectIndex, SkWStream* content);
70
71 // Converts (value / 255.0) with three significant digits of accuracy.
72 // Writes value as string into result. Returns strlen() of result.
73 size_t ColorToDecimal(uint8_t value, char result[5]);
AppendColorComponent(uint8_t value,SkWStream * wStream)74 inline void AppendColorComponent(uint8_t value, SkWStream* wStream) {
75 char buffer[5];
76 size_t len = SkPDFUtils::ColorToDecimal(value, buffer);
77 wStream->write(buffer, len);
78 }
79
AppendScalar(SkScalar value,SkWStream * stream)80 inline void AppendScalar(SkScalar value, SkWStream* stream) {
81 char result[kMaximumSkFloatToDecimalLength];
82 size_t len = SkFloatToDecimal(SkScalarToFloat(value), result);
83 SkASSERT(len < kMaximumSkFloatToDecimalLength);
84 stream->write(result, len);
85 }
86
87 void WriteString(SkWStream* wStream, const char* input, size_t len);
88
WriteUInt16BE(SkDynamicMemoryWStream * wStream,uint16_t value)89 inline void WriteUInt16BE(SkDynamicMemoryWStream* wStream, uint16_t value) {
90 char result[4];
91 result[0] = SkHexadecimalDigits::gUpper[ value >> 12 ];
92 result[1] = SkHexadecimalDigits::gUpper[0xF & (value >> 8 )];
93 result[2] = SkHexadecimalDigits::gUpper[0xF & (value >> 4 )];
94 result[3] = SkHexadecimalDigits::gUpper[0xF & (value )];
95 wStream->write(result, 4);
96 }
97
WriteUInt8(SkDynamicMemoryWStream * wStream,uint8_t value)98 inline void WriteUInt8(SkDynamicMemoryWStream* wStream, uint8_t value) {
99 char result[2] = { SkHexadecimalDigits::gUpper[value >> 4],
100 SkHexadecimalDigits::gUpper[value & 0xF] };
101 wStream->write(result, 2);
102 }
103
WriteUTF16beHex(SkDynamicMemoryWStream * wStream,SkUnichar utf32)104 inline void WriteUTF16beHex(SkDynamicMemoryWStream* wStream, SkUnichar utf32) {
105 uint16_t utf16[2] = {0, 0};
106 size_t len = SkUTF16_FromUnichar(utf32, utf16);
107 SkASSERT(len == 1 || len == 2);
108 SkPDFUtils::WriteUInt16BE(wStream, utf16[0]);
109 if (len == 2) {
110 SkPDFUtils::WriteUInt16BE(wStream, utf16[1]);
111 }
112 }
113
GetShaderLocalMatrix(const SkShader * shader)114 inline SkMatrix GetShaderLocalMatrix(const SkShader* shader) {
115 SkMatrix localMatrix;
116 if (sk_sp<SkShader> s = shader->makeAsALocalMatrixShader(&localMatrix)) {
117 return SkMatrix::Concat(s->getLocalMatrix(), localMatrix);
118 }
119 return shader->getLocalMatrix();
120 }
121 bool InverseTransformBBox(const SkMatrix& matrix, SkRect* bbox);
122 void PopulateTilingPatternDict(SkPDFDict* pattern,
123 SkRect& bbox,
124 sk_sp<SkPDFDict> resources,
125 const SkMatrix& matrix);
126
127 bool ToBitmap(const SkImage* img, SkBitmap* dst);
128 } // namespace SkPDFUtils
129
130 #endif
131