1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #include "SkData.h"
11 #include "SkGeometry.h"
12 #include "SkPaint.h"
13 #include "SkPath.h"
14 #include "SkPDFUtils.h"
15 #include "SkStream.h"
16 #include "SkString.h"
17 #include "SkPDFTypes.h"
18
19 // static
MatrixToArray(const SkMatrix & matrix)20 SkPDFArray* SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
21 SkScalar values[6];
22 if (!matrix.asAffine(values)) {
23 SkMatrix::SetAffineIdentity(values);
24 }
25
26 SkPDFArray* result = new SkPDFArray;
27 result->reserve(6);
28 for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
29 result->appendScalar(values[i]);
30 }
31 return result;
32 }
33
34 // static
AppendTransform(const SkMatrix & matrix,SkWStream * content)35 void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
36 SkScalar values[6];
37 if (!matrix.asAffine(values)) {
38 SkMatrix::SetAffineIdentity(values);
39 }
40 for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
41 SkPDFScalar::Append(values[i], content);
42 content->writeText(" ");
43 }
44 content->writeText("cm\n");
45 }
46
47 // static
MoveTo(SkScalar x,SkScalar y,SkWStream * content)48 void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
49 SkPDFScalar::Append(x, content);
50 content->writeText(" ");
51 SkPDFScalar::Append(y, content);
52 content->writeText(" m\n");
53 }
54
55 // static
AppendLine(SkScalar x,SkScalar y,SkWStream * content)56 void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
57 SkPDFScalar::Append(x, content);
58 content->writeText(" ");
59 SkPDFScalar::Append(y, content);
60 content->writeText(" l\n");
61 }
62
63 // static
AppendCubic(SkScalar ctl1X,SkScalar ctl1Y,SkScalar ctl2X,SkScalar ctl2Y,SkScalar dstX,SkScalar dstY,SkWStream * content)64 void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
65 SkScalar ctl2X, SkScalar ctl2Y,
66 SkScalar dstX, SkScalar dstY, SkWStream* content) {
67 SkString cmd("y\n");
68 SkPDFScalar::Append(ctl1X, content);
69 content->writeText(" ");
70 SkPDFScalar::Append(ctl1Y, content);
71 content->writeText(" ");
72 if (ctl2X != dstX || ctl2Y != dstY) {
73 cmd.set("c\n");
74 SkPDFScalar::Append(ctl2X, content);
75 content->writeText(" ");
76 SkPDFScalar::Append(ctl2Y, content);
77 content->writeText(" ");
78 }
79 SkPDFScalar::Append(dstX, content);
80 content->writeText(" ");
81 SkPDFScalar::Append(dstY, content);
82 content->writeText(" ");
83 content->writeText(cmd.c_str());
84 }
85
86 // static
AppendRectangle(const SkRect & rect,SkWStream * content)87 void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
88 // Skia has 0,0 at top left, pdf at bottom left. Do the right thing.
89 SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);
90
91 SkPDFScalar::Append(rect.fLeft, content);
92 content->writeText(" ");
93 SkPDFScalar::Append(bottom, content);
94 content->writeText(" ");
95 SkPDFScalar::Append(rect.width(), content);
96 content->writeText(" ");
97 SkPDFScalar::Append(rect.height(), content);
98 content->writeText(" re\n");
99 }
100
101 // static
EmitPath(const SkPath & path,SkPaint::Style paintStyle,SkWStream * content)102 void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
103 SkWStream* content) {
104 // Filling a path with no area results in a drawing in PDF renderers but
105 // Chrome expects to be able to draw some such entities with no visible
106 // result, so we detect those cases and discard the drawing for them.
107 // Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).
108 enum SkipFillState {
109 kEmpty_SkipFillState = 0,
110 kSingleLine_SkipFillState = 1,
111 kNonSingleLine_SkipFillState = 2,
112 };
113 SkipFillState fillState = kEmpty_SkipFillState;
114 if (paintStyle != SkPaint::kFill_Style) {
115 fillState = kNonSingleLine_SkipFillState;
116 }
117 SkPoint lastMovePt;
118 SkDynamicMemoryWStream currentSegment;
119 SkPoint args[4];
120 SkPath::Iter iter(path, false);
121 for (SkPath::Verb verb = iter.next(args);
122 verb != SkPath::kDone_Verb;
123 verb = iter.next(args)) {
124 // args gets all the points, even the implicit first point.
125 switch (verb) {
126 case SkPath::kMove_Verb:
127 MoveTo(args[0].fX, args[0].fY, ¤tSegment);
128 lastMovePt = args[0];
129 fillState = kEmpty_SkipFillState;
130 break;
131 case SkPath::kLine_Verb:
132 AppendLine(args[1].fX, args[1].fY, ¤tSegment);
133 if (fillState == kEmpty_SkipFillState) {
134 if (args[0] != lastMovePt) {
135 fillState = kSingleLine_SkipFillState;
136 }
137 } else if (fillState == kSingleLine_SkipFillState) {
138 fillState = kNonSingleLine_SkipFillState;
139 }
140 break;
141 case SkPath::kQuad_Verb: {
142 SkPoint cubic[4];
143 SkConvertQuadToCubic(args, cubic);
144 AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
145 cubic[3].fX, cubic[3].fY, ¤tSegment);
146 fillState = kNonSingleLine_SkipFillState;
147 break;
148 }
149 case SkPath::kCubic_Verb:
150 AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
151 args[3].fX, args[3].fY, ¤tSegment);
152 fillState = kNonSingleLine_SkipFillState;
153 break;
154 case SkPath::kClose_Verb:
155 if (fillState != kSingleLine_SkipFillState) {
156 ClosePath(¤tSegment);
157 SkData* data = currentSegment.copyToData();
158 content->write(data->data(), data->size());
159 data->unref();
160 }
161 currentSegment.reset();
162 break;
163 default:
164 SkASSERT(false);
165 break;
166 }
167 }
168 if (currentSegment.bytesWritten() > 0) {
169 SkData* data = currentSegment.copyToData();
170 content->write(data->data(), data->size());
171 data->unref();
172 }
173 }
174
175 // static
ClosePath(SkWStream * content)176 void SkPDFUtils::ClosePath(SkWStream* content) {
177 content->writeText("h\n");
178 }
179
180 // static
PaintPath(SkPaint::Style style,SkPath::FillType fill,SkWStream * content)181 void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
182 SkWStream* content) {
183 if (style == SkPaint::kFill_Style) {
184 content->writeText("f");
185 } else if (style == SkPaint::kStrokeAndFill_Style) {
186 content->writeText("B");
187 } else if (style == SkPaint::kStroke_Style) {
188 content->writeText("S");
189 }
190
191 if (style != SkPaint::kStroke_Style) {
192 NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
193 NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
194 if (fill == SkPath::kEvenOdd_FillType) {
195 content->writeText("*");
196 }
197 }
198 content->writeText("\n");
199 }
200
201 // static
StrokePath(SkWStream * content)202 void SkPDFUtils::StrokePath(SkWStream* content) {
203 SkPDFUtils::PaintPath(
204 SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
205 }
206
207 // static
DrawFormXObject(int objectIndex,SkWStream * content)208 void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
209 content->writeText("/X");
210 content->writeDecAsText(objectIndex);
211 content->writeText(" Do\n");
212 }
213
214 // static
ApplyGraphicState(int objectIndex,SkWStream * content)215 void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
216 content->writeText("/G");
217 content->writeDecAsText(objectIndex);
218 content->writeText(" gs\n");
219 }
220