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 "SkCanvas.h" 14 #include "SkGlyphRunPainter.h" 15 #include "SkMask.h" 16 #include "SkPaint.h" 17 #include "SkPixmap.h" 18 #include "SkStrokeRec.h" 19 #include "SkVertices.h" 20 21 class SkBitmap; 22 class SkClipStack; 23 class SkBaseDevice; 24 class SkBlitter; 25 class SkMatrix; 26 class SkPath; 27 class SkRegion; 28 class SkRasterClip; 29 struct SkRect; 30 class SkRRect; 31 32 class SkDraw : public SkGlyphRunListPainter::BitmapDevicePainter { 33 public: 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(SkVertices::VertexMode mode, int vertexCount, 66 const SkPoint vertices[], const SkPoint textures[], 67 const SkColor colors[], const SkVertices::BoneIndices boneIndices[], 68 const SkVertices::BoneWeights boneWeights[], SkBlendMode bmode, 69 const uint16_t indices[], int ptCount, 70 const SkPaint& paint, const SkVertices::Bone bones[], int boneCount) const; 71 72 /** 73 * Overwrite the target with the path's coverage (i.e. its mask). 74 * Will overwrite the entire device, so it need not be zero'd first. 75 * 76 * Only device A8 is supported right now. 77 */ 78 void drawPathCoverage(const SkPath& src, const SkPaint& paint, 79 SkBlitter* customBlitter = nullptr) const { 80 bool isHairline = paint.getStyle() == SkPaint::kStroke_Style && 81 paint.getStrokeWidth() > 0; 82 this->drawPath(src, paint, nullptr, false, !isHairline, customBlitter); 83 } 84 85 void paintPaths(SkSpan<const SkPathPos> pathsAndPositions, 86 SkScalar scale, 87 const SkPaint& paint) const override; 88 89 void paintMasks(SkSpan<const SkMask> masks, const SkPaint& paint) const override; 90 91 static bool ComputeMaskBounds(const SkRect& devPathBounds, const SkIRect* clipBounds, 92 const SkMaskFilter* filter, const SkMatrix* filterMatrix, 93 SkIRect* bounds); 94 95 /** Helper function that creates a mask from a path and an optional maskfilter. 96 Note however, that the resulting mask will not have been actually filtered, 97 that must be done afterwards (by calling filterMask). The maskfilter is provided 98 solely to assist in computing the mask's bounds (if the mode requests that). 99 */ 100 static bool DrawToMask(const SkPath& devPath, const SkIRect* clipBounds, 101 const SkMaskFilter*, const SkMatrix* filterMatrix, 102 SkMask* mask, SkMask::CreateMode mode, 103 SkStrokeRec::InitStyle style); 104 105 void drawDevMask(const SkMask& mask, const SkPaint&) const; 106 107 enum RectType { 108 kHair_RectType, 109 kFill_RectType, 110 kStroke_RectType, 111 kPath_RectType 112 }; 113 114 /** 115 * Based on the paint's style, strokeWidth, and the matrix, classify how 116 * to draw the rect. If no special-case is available, returns 117 * kPath_RectType. 118 * 119 * Iff RectType == kStroke_RectType, then strokeSize is set to the device 120 * width and height of the stroke. 121 */ 122 static RectType ComputeRectType(const SkPaint&, const SkMatrix&, 123 SkPoint* strokeSize); 124 125 static bool ShouldDrawTextAsPaths(const SkFont&, const SkPaint&, const SkMatrix&, 126 SkScalar sizeLimit = 1024); 127 128 static SkScalar ComputeResScaleForStroking(const SkMatrix& ); 129 private: 130 void drawBitmapAsMask(const SkBitmap&, const SkPaint&) const; 131 132 void drawPath(const SkPath&, 133 const SkPaint&, 134 const SkMatrix* preMatrix, 135 bool pathIsMutable, 136 bool drawCoverage, 137 SkBlitter* customBlitter = nullptr) const; 138 139 void drawLine(const SkPoint[2], const SkPaint&) const; 140 141 void drawDevPath(const SkPath& devPath, 142 const SkPaint& paint, 143 bool drawCoverage, 144 SkBlitter* customBlitter, 145 bool doFill) const; 146 /** 147 * Return the current clip bounds, in local coordinates, with slop to account 148 * for antialiasing or hairlines (i.e. device-bounds outset by 1, and then 149 * run through the inverse of the matrix). 150 * 151 * If the matrix cannot be inverted, or the current clip is empty, return 152 * false and ignore bounds parameter. 153 */ 154 bool SK_WARN_UNUSED_RESULT computeConservativeLocalClipBounds(SkRect* bounds) const; 155 156 public: 157 SkPixmap fDst; 158 const SkMatrix* fMatrix{nullptr}; // required 159 const SkRasterClip* fRC{nullptr}; // required 160 161 // optional, will be same dimensions as fDst if present 162 const SkPixmap* fCoverage{nullptr}; 163 164 #ifdef SK_DEBUG 165 void validate() const; 166 #else 167 void validate() const {} 168 #endif 169 }; 170 171 #endif 172
