1
2/*
3 * Copyright 2006 The Android Open Source Project
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#ifndef SkDraw_DEFINED
11#define SkDraw_DEFINED
12
13#include "include/core/SkCanvas.h"
14#include "include/core/SkPaint.h"
15#include "include/core/SkPixmap.h"
16#include "include/core/SkStrokeRec.h"
17#include "src/core/SkGlyphRunPainter.h"
18#include "src/core/SkMask.h"
19
20class SkBitmap;
21class SkClipStack;
22class SkBaseDevice;
23class SkBlitter;
24class SkMatrix;
25class SkPath;
26class SkRegion;
27class SkRasterClip;
28struct SkRect;
29class SkRRect;
30class SkVertices;
31
32class SkDraw : public SkGlyphRunListPainter::BitmapDevicePainter {
33public:
34 SkDraw();
35
36 void drawPaint(const SkPaint&) const;
37 void drawPoints(SkCanvas::PointMode, size_t count, const SkPoint[],
38 const SkPaint&, SkBaseDevice*) const;
39 void drawRect(const SkRect& prePaintRect, const SkPaint&, const SkMatrix* paintMatrix,
40 const SkRect* postPaintRect) const;
41 void drawRect(const SkRect& rect, const SkPaint& paint) const {
42 this->drawRect(rect, paint, nullptr, nullptr);
43 }
44 void drawRRect(const SkRRect&, const SkPaint&) const;
45 /**
46 * To save on mallocs, we allow a flag that tells us that srcPath is
47 * mutable, so that we don't have to make copies of it as we transform it.
48 *
49 * If prePathMatrix is not null, it should logically be applied before any
50 * stroking or other effects. If there are no effects on the paint that
51 * affect the geometry/rasterization, then the pre matrix can just be
52 * pre-concated with the current matrix.
53 */
54 void drawPath(const SkPath& path, const SkPaint& paint,
55 const SkMatrix* prePathMatrix = nullptr, bool pathIsMutable = false) const {
56 this->drawPath(path, paint, prePathMatrix, pathIsMutable, false);
57 }
58
59 /* If dstOrNull is null, computes a dst by mapping the bitmap's bounds through the matrix. */
60 void drawBitmap(const SkBitmap&, const SkMatrix&, const SkRect* dstOrNull,
61 const SkPaint&) const;
62 void drawSprite(const SkBitmap&, int x, int y, const SkPaint&) const;
63 void drawGlyphRunList(const SkGlyphRunList& glyphRunList,
64 SkGlyphRunListPainter* glyphPainter) const;
65 void drawVertices(const SkVertices*, SkBlendMode, const SkPaint&) const;
66 void drawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], int count,
67 SkBlendMode, const SkPaint&);
68
69 /**
70 * Overwrite the target with the path's coverage (i.e. its mask).
71 * Will overwrite the entire device, so it need not be zero'd first.
72 *
73 * Only device A8 is supported right now.
74 */
75 void drawPathCoverage(const SkPath& src, const SkPaint& paint,
76 SkBlitter* customBlitter = nullptr) const {
77 bool isHairline = paint.getStyle() == SkPaint::kStroke_Style &&
78 paint.getStrokeWidth() > 0;
79 this->drawPath(src, paint, nullptr, false, !isHairline, customBlitter);
80 }
81
82 void paintPaths(SkDrawableGlyphBuffer* drawables,
83 SkScalar scale,
84 const SkPaint& paint) const override;
85
86 void paintMasks(SkDrawableGlyphBuffer* drawables, const SkPaint& paint) const override;
87
88 static bool ComputeMaskBounds(const SkRect& devPathBounds, const SkIRect* clipBounds,
89 const SkMaskFilter* filter, const SkMatrix* filterMatrix,
90 SkIRect* bounds);
91
92 /** Helper function that creates a mask from a path and an optional maskfilter.
93 Note however, that the resulting mask will not have been actually filtered,
94 that must be done afterwards (by calling filterMask). The maskfilter is provided
95 solely to assist in computing the mask's bounds (if the mode requests that).
96 */
97 static bool DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
98 const SkMaskFilter*, const SkMatrix* filterMatrix,
99 SkMask* mask, SkMask::CreateMode mode,
100 SkStrokeRec::InitStyle style);
101
102 void drawDevMask(const SkMask& mask, const SkPaint&) const;
103
104 enum RectType {
105 kHair_RectType,
106 kFill_RectType,
107 kStroke_RectType,
108 kPath_RectType
109 };
110
111 /**
112 * Based on the paint's style, strokeWidth, and the matrix, classify how
113 * to draw the rect. If no special-case is available, returns
114 * kPath_RectType.
115 *
116 * Iff RectType == kStroke_RectType, then strokeSize is set to the device
117 * width and height of the stroke.
118 */
119 static RectType ComputeRectType(const SkPaint&, const SkMatrix&,
120 SkPoint* strokeSize);
121
122 static SkScalar ComputeResScaleForStroking(const SkMatrix& );
123
124private:
125 void drawBitmapAsMask(const SkBitmap&, const SkPaint&) const;
126 void draw_fixed_vertices(const SkVertices*, SkBlendMode, const SkPaint&, const SkMatrix&,
127 const SkPoint dev2[], const SkPoint3 dev3[], SkArenaAlloc*) const;
128 void draw_vdata_vertices(const SkVertices*, const SkPaint&, const SkMatrix&,
129 const SkPoint[], const SkPoint3[], SkArenaAlloc*) const;
130
131 void drawPath(const SkPath&,
132 const SkPaint&,
133 const SkMatrix* preMatrix,
134 bool pathIsMutable,
135 bool drawCoverage,
136 SkBlitter* customBlitter = nullptr) const;
137
138 void drawLine(const SkPoint[2], const SkPaint&) const;
139
140 void drawDevPath(const SkPath& devPath,
141 const SkPaint& paint,
142 bool drawCoverage,
143 SkBlitter* customBlitter,
144 bool doFill) const;
145 /**
146 * Return the current clip bounds, in local coordinates, with slop to account
147 * for antialiasing or hairlines (i.e. device-bounds outset by 1, and then
148 * run through the inverse of the matrix).
149 *
150 * If the matrix cannot be inverted, or the current clip is empty, return
151 * false and ignore bounds parameter.
152 */
153 bool SK_WARN_UNUSED_RESULT computeConservativeLocalClipBounds(SkRect* bounds) const;
154
155public:
156 SkPixmap fDst;
157 const SkMatrix* fMatrix{nullptr}; // required
158 const SkRasterClip* fRC{nullptr}; // required
159
160 // optional, will be same dimensions as fDst if present
161 const SkPixmap* fCoverage{nullptr};
162
163#ifdef SK_DEBUG
164 void validate() const;
165#else
166 void validate() const {}
167#endif
168};
169
170#endif
171