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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 "SkGeometry.h"
11 #include "SkPaint.h"
12 #include "SkPath.h"
13 #include "SkPDFUtils.h"
14 #include "SkStream.h"
15 #include "SkString.h"
16 #include "SkPDFTypes.h"
17 
18 // static
MatrixToArray(const SkMatrix & matrix)19 SkPDFArray* SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
20     SkScalar values[6];
21     if (!matrix.asAffine(values)) {
22         SkMatrix::SetAffineIdentity(values);
23     }
24 
25     SkPDFArray* result = new SkPDFArray;
26     result->reserve(6);
27     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
28         result->appendScalar(values[i]);
29     }
30     return result;
31 }
32 
33 // static
AppendTransform(const SkMatrix & matrix,SkWStream * content)34 void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
35     SkScalar values[6];
36     if (!matrix.asAffine(values)) {
37         SkMatrix::SetAffineIdentity(values);
38     }
39     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
40         SkPDFScalar::Append(values[i], content);
41         content->writeText(" ");
42     }
43     content->writeText("cm\n");
44 }
45 
46 // static
MoveTo(SkScalar x,SkScalar y,SkWStream * content)47 void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
48     SkPDFScalar::Append(x, content);
49     content->writeText(" ");
50     SkPDFScalar::Append(y, content);
51     content->writeText(" m\n");
52 }
53 
54 // static
AppendLine(SkScalar x,SkScalar y,SkWStream * content)55 void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
56     SkPDFScalar::Append(x, content);
57     content->writeText(" ");
58     SkPDFScalar::Append(y, content);
59     content->writeText(" l\n");
60 }
61 
62 // static
AppendCubic(SkScalar ctl1X,SkScalar ctl1Y,SkScalar ctl2X,SkScalar ctl2Y,SkScalar dstX,SkScalar dstY,SkWStream * content)63 void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
64                              SkScalar ctl2X, SkScalar ctl2Y,
65                              SkScalar dstX, SkScalar dstY, SkWStream* content) {
66     SkString cmd("y\n");
67     SkPDFScalar::Append(ctl1X, content);
68     content->writeText(" ");
69     SkPDFScalar::Append(ctl1Y, content);
70     content->writeText(" ");
71     if (ctl2X != dstX || ctl2Y != dstY) {
72         cmd.set("c\n");
73         SkPDFScalar::Append(ctl2X, content);
74         content->writeText(" ");
75         SkPDFScalar::Append(ctl2Y, content);
76         content->writeText(" ");
77     }
78     SkPDFScalar::Append(dstX, content);
79     content->writeText(" ");
80     SkPDFScalar::Append(dstY, content);
81     content->writeText(" ");
82     content->writeText(cmd.c_str());
83 }
84 
85 // static
AppendRectangle(const SkRect & rect,SkWStream * content)86 void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
87     // Skia has 0,0 at top left, pdf at bottom left.  Do the right thing.
88     SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);
89 
90     SkPDFScalar::Append(rect.fLeft, content);
91     content->writeText(" ");
92     SkPDFScalar::Append(bottom, content);
93     content->writeText(" ");
94     SkPDFScalar::Append(rect.width(), content);
95     content->writeText(" ");
96     SkPDFScalar::Append(rect.height(), content);
97     content->writeText(" re\n");
98 }
99 
100 // static
EmitPath(const SkPath & path,SkWStream * content)101 void SkPDFUtils::EmitPath(const SkPath& path, SkWStream* content) {
102     SkPoint args[4];
103     SkPath::Iter iter(path, false);
104     for (SkPath::Verb verb = iter.next(args);
105          verb != SkPath::kDone_Verb;
106          verb = iter.next(args)) {
107         // args gets all the points, even the implicit first point.
108         switch (verb) {
109             case SkPath::kMove_Verb:
110                 MoveTo(args[0].fX, args[0].fY, content);
111                 break;
112             case SkPath::kLine_Verb:
113                 AppendLine(args[1].fX, args[1].fY, content);
114                 break;
115             case SkPath::kQuad_Verb: {
116                 SkPoint cubic[4];
117                 SkConvertQuadToCubic(args, cubic);
118                 AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
119                             cubic[3].fX, cubic[3].fY, content);
120                 break;
121             }
122             case SkPath::kCubic_Verb:
123                 AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
124                             args[3].fX, args[3].fY, content);
125                 break;
126             case SkPath::kClose_Verb:
127                 ClosePath(content);
128                 break;
129             default:
130                 SkASSERT(false);
131                 break;
132         }
133     }
134 }
135 
136 // static
ClosePath(SkWStream * content)137 void SkPDFUtils::ClosePath(SkWStream* content) {
138     content->writeText("h\n");
139 }
140 
141 // static
PaintPath(SkPaint::Style style,SkPath::FillType fill,SkWStream * content)142 void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
143                            SkWStream* content) {
144     if (style == SkPaint::kFill_Style) {
145         content->writeText("f");
146     } else if (style == SkPaint::kStrokeAndFill_Style) {
147         content->writeText("B");
148     } else if (style == SkPaint::kStroke_Style) {
149         content->writeText("S");
150     }
151 
152     if (style != SkPaint::kStroke_Style) {
153         NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
154         NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
155         if (fill == SkPath::kEvenOdd_FillType) {
156             content->writeText("*");
157         }
158     }
159     content->writeText("\n");
160 }
161 
162 // static
StrokePath(SkWStream * content)163 void SkPDFUtils::StrokePath(SkWStream* content) {
164     SkPDFUtils::PaintPath(
165         SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
166 }
167 
168 // static
DrawFormXObject(int objectIndex,SkWStream * content)169 void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
170     content->writeText("/X");
171     content->writeDecAsText(objectIndex);
172     content->writeText(" Do\n");
173 }
174 
175 // static
ApplyGraphicState(int objectIndex,SkWStream * content)176 void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
177     content->writeText("/G");
178     content->writeDecAsText(objectIndex);
179     content->writeText(" gs\n");
180 }
181