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
8
9 #ifndef SkPDFUtils_DEFINED
10 #define SkPDFUtils_DEFINED
11
12 #include "SkPaint.h"
13 #include "SkPath.h"
14 #include "SkStream.h"
15 #include "SkUtils.h"
16
17 class SkMatrix;
18 class SkPDFArray;
19 struct SkRect;
20
21 #if 0
22 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
23 #else
24 #define PRINT_NOT_IMPL(str)
25 #endif
26
27 #define NOT_IMPLEMENTED(condition, assert) \
28 do { \
29 if ((bool)(condition)) { \
30 PRINT_NOT_IMPL("NOT_IMPLEMENTED: " #condition "\n"); \
31 SkDEBUGCODE(SkASSERT(!assert);) \
32 } \
33 } while (0)
34
35 namespace SkPDFUtils {
36
37 sk_sp<SkPDFArray> RectToArray(const SkRect& rect);
38 sk_sp<SkPDFArray> MatrixToArray(const SkMatrix& matrix);
39 void AppendTransform(const SkMatrix& matrix, SkWStream* content);
40
41 void MoveTo(SkScalar x, SkScalar y, SkWStream* content);
42 void AppendLine(SkScalar x, SkScalar y, SkWStream* content);
43 void AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
44 SkScalar ctl2X, SkScalar ctl2Y,
45 SkScalar dstX, SkScalar dstY, SkWStream* content);
46 void AppendRectangle(const SkRect& rect, SkWStream* content);
47 void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
48 bool doConsumeDegerates, SkWStream* content, SkScalar tolerance = 0.25f);
49 inline void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
50 SkWStream* content, SkScalar tolerance = 0.25f) {
51 SkPDFUtils::EmitPath(path, paintStyle, true, content, tolerance);
52 }
53 void ClosePath(SkWStream* content);
54 void PaintPath(SkPaint::Style style, SkPath::FillType fill,
55 SkWStream* content);
56 void StrokePath(SkWStream* content);
57 void DrawFormXObject(int objectIndex, SkWStream* content);
58 void ApplyGraphicState(int objectIndex, SkWStream* content);
59 void ApplyPattern(int objectIndex, SkWStream* content);
60
61 // Converts (value / 255.0) with three significant digits of accuracy.
62 // Writes value as string into result. Returns strlen() of result.
63 size_t ColorToDecimal(uint8_t value, char result[5]);
AppendColorComponent(uint8_t value,SkWStream * wStream)64 inline void AppendColorComponent(uint8_t value, SkWStream* wStream) {
65 char buffer[5];
66 size_t len = SkPDFUtils::ColorToDecimal(value, buffer);
67 wStream->write(buffer, len);
68 }
69
70 // 3 = '-', '.', and '\0' characters.
71 // 9 = number of significant digits
72 // abs(FLT_MIN_10_EXP) = number of zeros in FLT_MIN
73 const size_t kMaximumFloatDecimalLength = 3 + 9 - FLT_MIN_10_EXP;
74 // FloatToDecimal is exposed for unit tests.
75 size_t FloatToDecimal(float value,
76 char output[kMaximumFloatDecimalLength]);
77 void AppendScalar(SkScalar value, SkWStream* stream);
78 void WriteString(SkWStream* wStream, const char* input, size_t len);
79
WriteUInt16BE(SkDynamicMemoryWStream * wStream,uint16_t value)80 inline void WriteUInt16BE(SkDynamicMemoryWStream* wStream, uint16_t value) {
81 static const char gHex[] = "0123456789ABCDEF";
82 char result[4];
83 result[0] = gHex[ value >> 12 ];
84 result[1] = gHex[0xF & (value >> 8 )];
85 result[2] = gHex[0xF & (value >> 4 )];
86 result[3] = gHex[0xF & (value )];
87 wStream->write(result, 4);
88 }
WriteUInt8(SkDynamicMemoryWStream * wStream,uint8_t value)89 inline void WriteUInt8(SkDynamicMemoryWStream* wStream, uint8_t value) {
90 static const char gHex[] = "0123456789ABCDEF";
91 char result[2];
92 result[0] = gHex[value >> 4 ];
93 result[1] = gHex[0xF & value];
94 wStream->write(result, 2);
95 }
WriteUTF16beHex(SkDynamicMemoryWStream * wStream,SkUnichar utf32)96 inline void WriteUTF16beHex(SkDynamicMemoryWStream* wStream, SkUnichar utf32) {
97 uint16_t utf16[2] = {0, 0};
98 size_t len = SkUTF16_FromUnichar(utf32, utf16);
99 SkASSERT(len == 1 || len == 2);
100 SkPDFUtils::WriteUInt16BE(wStream, utf16[0]);
101 if (len == 2) {
102 SkPDFUtils::WriteUInt16BE(wStream, utf16[1]);
103 }
104 }
105 } // namespace SkPDFUtils
106
107 #endif
108