1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Helper class to help with generating anonymous path elements for
<animateMotion> elements to use. */
#ifndef MOZILLA_SVGMOTIONSMILPATHUTILS_H_
#define MOZILLA_SVGMOTIONSMILPATHUTILS_H_
#include "mozilla/Attributes.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsDebug.h"
#include "nsSMILParserUtils.h"
#include "nsTArray.h"
class nsAString;
class nsSVGElement;
namespace mozilla {
class SVGMotionSMILPathUtils
{
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::Path Path;
typedef mozilla::gfx::PathBuilder PathBuilder;
public:
// Class to assist in generating a Path, based on
// coordinates in the <animateMotion> from/by/to/values attributes.
class PathGenerator {
public:
explicit PathGenerator(const nsSVGElement* aSVGElement)
: mSVGElement(aSVGElement),
mHaveReceivedCommands(false)
{
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
NS_ASSERTION(gfxPlatform::GetPlatform()->
SupportsAzureContentForDrawTarget(drawTarget),
"Should support Moz2D content drawing");
mPathBuilder = drawTarget->CreatePathBuilder();
}
// Methods for adding various path commands to output path.
// Note: aCoordPairStr is expected to be a whitespace and/or
// comma-separated x,y coordinate-pair -- see description of
// "the specified values for from, by, to, and values" at
// http://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
void MoveToOrigin();
bool MoveToAbsolute(const nsAString& aCoordPairStr);
bool LineToAbsolute(const nsAString& aCoordPairStr,
double& aSegmentDistance);
bool LineToRelative(const nsAString& aCoordPairStr,
double& aSegmentDistance);
// Accessor to let clients check if we've received any commands yet.
inline bool HaveReceivedCommands() { return mHaveReceivedCommands; }
// Accessor to get the finalized path
already_AddRefed<Path> GetResultingPath();
protected:
// Helper methods
bool ParseCoordinatePair(const nsAString& aStr,
float& aXVal, float& aYVal);
// Member data
const nsSVGElement* mSVGElement; // context for converting to user units
RefPtr<PathBuilder> mPathBuilder;
bool mHaveReceivedCommands;
};
// Class to assist in passing each subcomponent of a |values| attribute to
// a PathGenerator, for generating a corresponding Path.
class MOZ_STACK_CLASS MotionValueParser :
public nsSMILParserUtils::GenericValueParser
{
public:
MotionValueParser(PathGenerator* aPathGenerator,
FallibleTArray<double>* aPointDistances)
: mPathGenerator(aPathGenerator),
mPointDistances(aPointDistances),
mDistanceSoFar(0.0)
{
MOZ_ASSERT(mPointDistances->IsEmpty(),
"expecting point distances array to start empty");
}
// nsSMILParserUtils::GenericValueParser interface
virtual bool Parse(const nsAString& aValueStr) override;
protected:
PathGenerator* mPathGenerator;
FallibleTArray<double>* mPointDistances;
double mDistanceSoFar;
};
};
} // namespace mozilla
#endif // MOZILLA_SVGMOTIONSMILPATHUTILS_H_
|
