SkPDFUtils.cpp revision 769fa6a013baca6d7404e2bf096a34a7e3635fa5 
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
19SkPDFArray* 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
34void 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
47void 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
55void 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
63void 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
86void 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
101void 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
137void SkPDFUtils::ClosePath(SkWStream* content) {
138    content->writeText("h\n");
139}
140
141// static
142void 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
163void SkPDFUtils::StrokePath(SkWStream* content) {
164    SkPDFUtils::PaintPath(
165        SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
166}
167
168// static
169void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
170    content->writeText("/X");
171    content->writeDecAsText(objectIndex);
172    content->writeText(" Do\n");
173}
174
175// static
176void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
177    content->writeText("/G");
178    content->writeDecAsText(objectIndex);
179    content->writeText(" gs\n");
180}
181