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 "SkMask.h" 15 #include "SkPaint.h" 16 #include "SkPixmap.h" 17 #include "SkStrokeRec.h" 18 #include "SkVertices.h" 19 20 class SkBitmap; 21 class SkClipStack; 22 class SkBaseDevice; 23 class SkBlitter; 24 class SkMatrix; 25 class SkPath; 26 class SkRegion; 27 class SkRasterClip; 28 struct SkDrawProcs; 29 struct SkRect; 30 class SkRRect; 31 32 class SkDraw { 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; drawRect(const SkRect & rect,const SkPaint & paint)41 void drawRect(const SkRect& rect, const SkPaint& paint) const { 42 this->drawRect(rect, paint, NULL, NULL); 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 */ drawPath(const SkPath & path,const SkPaint & paint,const SkMatrix * prePathMatrix,bool pathIsMutable)54 void drawPath(const SkPath& path, const SkPaint& paint, 55 const SkMatrix* prePathMatrix, bool pathIsMutable) const { 56 this->drawPath(path, paint, prePathMatrix, pathIsMutable, false); 57 } 58 59 void drawPath(const SkPath& path, const SkPaint& paint, 60 SkBlitter* customBlitter = NULL) const { 61 this->drawPath(path, paint, NULL, false, false, customBlitter); 62 } 63 64 /* If dstOrNull is null, computes a dst by mapping the bitmap's bounds through the matrix. */ 65 void drawBitmap(const SkBitmap&, const SkMatrix&, const SkRect* dstOrNull, 66 const SkPaint&) const; 67 void drawSprite(const SkBitmap&, int x, int y, const SkPaint&) const; 68 void drawText(const char text[], size_t byteLength, SkScalar x, 69 SkScalar y, const SkPaint& paint, const SkSurfaceProps*) const; 70 void drawPosText(const char text[], size_t byteLength, 71 const SkScalar pos[], int scalarsPerPosition, 72 const SkPoint& offset, const SkPaint&, const SkSurfaceProps*) const; 73 void drawVertices(SkVertices::VertexMode mode, int count, 74 const SkPoint vertices[], const SkPoint textures[], 75 const SkColor colors[], SkBlendMode bmode, 76 const uint16_t indices[], int ptCount, 77 const SkPaint& paint) const; 78 79 /** 80 * Overwrite the target with the path's coverage (i.e. its mask). 81 * Will overwrite the entire device, so it need not be zero'd first. 82 * 83 * Only device A8 is supported right now. 84 */ 85 void drawPathCoverage(const SkPath& src, const SkPaint& paint, 86 SkBlitter* customBlitter = NULL) const { 87 bool isHairline = paint.getStyle() == SkPaint::kStroke_Style && 88 paint.getStrokeWidth() > 0; 89 this->drawPath(src, paint, NULL, false, !isHairline, customBlitter); 90 } 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 bool ShouldDrawTextAsPaths(const SkPaint&, const SkMatrix&); 123 void drawText_asPaths(const char text[], size_t byteLength, SkScalar x, SkScalar y, 124 const SkPaint&) const; 125 void drawPosText_asPaths(const char text[], size_t byteLength, const SkScalar pos[], 126 int scalarsPerPosition, const SkPoint& offset, 127 const SkPaint&, const SkSurfaceProps*) const; 128 static SkScalar ComputeResScaleForStroking(const SkMatrix& ); 129 private: 130 void drawBitmapAsMask(const SkBitmap&, const SkPaint&) const; 131 132 void drawPath(const SkPath&, const SkPaint&, const SkMatrix* preMatrix, 133 bool pathIsMutable, bool drawCoverage, 134 SkBlitter* customBlitter = NULL) const; 135 136 void drawLine(const SkPoint[2], const SkPaint&) const; 137 void drawDevPath(const SkPath& devPath, const SkPaint& paint, bool drawCoverage, 138 SkBlitter* customBlitter, bool doFill) const; 139 /** 140 * Return the current clip bounds, in local coordinates, with slop to account 141 * for antialiasing or hairlines (i.e. device-bounds outset by 1, and then 142 * run through the inverse of the matrix). 143 * 144 * If the matrix cannot be inverted, or the current clip is empty, return 145 * false and ignore bounds parameter. 146 */ 147 bool SK_WARN_UNUSED_RESULT 148 computeConservativeLocalClipBounds(SkRect* bounds) const; 149 150 /** Returns the current setting for using fake gamma and contrast. */ 151 uint32_t SK_WARN_UNUSED_RESULT scalerContextFlags() const; 152 153 public: 154 SkPixmap fDst; 155 const SkMatrix* fMatrix; // required 156 const SkRasterClip* fRC; // required 157 158 #ifdef SK_DEBUG 159 void validate() const; 160 #else validate()161 void validate() const {} 162 #endif 163 }; 164 165 #endif 166