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 17 class SkBitmap; 18 class SkBounder; 19 class SkClipStack; 20 class SkDevice; 21 class SkMatrix; 22 class SkPath; 23 class SkRegion; 24 class SkRasterClip; 25 struct SkDrawProcs; 26 struct SkRect; 27 28 class SkDraw { 29 public: 30 SkDraw(); 31 SkDraw(const SkDraw& src); 32 33 void drawPaint(const SkPaint&) const; 34 void drawPoints(SkCanvas::PointMode, size_t count, const SkPoint[], 35 const SkPaint&, bool forceUseDevice = false) const; 36 void drawRect(const SkRect&, const SkPaint&) const; 37 /** 38 * To save on mallocs, we allow a flag that tells us that srcPath is 39 * mutable, so that we don't have to make copies of it as we transform it. 40 * 41 * If prePathMatrix is not null, it should logically be applied before any 42 * stroking or other effects. If there are no effects on the paint that 43 * affect the geometry/rasterization, then the pre matrix can just be 44 * pre-concated with the current matrix. 45 */ 46 void drawPath(const SkPath& srcPath, const SkPaint&, 47 const SkMatrix* prePathMatrix, bool pathIsMutable) const; 48 void drawBitmap(const SkBitmap&, const SkMatrix&, const SkPaint&) const; 49 void drawSprite(const SkBitmap&, int x, int y, const SkPaint&) const; 50 void drawText(const char text[], size_t byteLength, SkScalar x, 51 SkScalar y, const SkPaint& paint) const; 52 void drawPosText(const char text[], size_t byteLength, 53 const SkScalar pos[], SkScalar constY, 54 int scalarsPerPosition, const SkPaint& paint) const; 55 void drawTextOnPath(const char text[], size_t byteLength, 56 const SkPath&, const SkMatrix*, const SkPaint&) const; 57 #ifdef SK_BUILD_FOR_ANDROID 58 void drawPosTextOnPath(const char text[], size_t byteLength, 59 const SkPoint pos[], const SkPaint& paint, 60 const SkPath& path, const SkMatrix* matrix) const; 61 #endif 62 void drawVertices(SkCanvas::VertexMode mode, int count, 63 const SkPoint vertices[], const SkPoint textures[], 64 const SkColor colors[], SkXfermode* xmode, 65 const uint16_t indices[], int ptCount, 66 const SkPaint& paint) const; 67 68 void drawPath(const SkPath& src, const SkPaint& paint) const { 69 this->drawPath(src, paint, NULL, false); 70 } 71 72 /** Helper function that creates a mask from a path and an optional maskfilter. 73 Note however, that the resulting mask will not have been actually filtered, 74 that must be done afterwards (by calling filterMask). The maskfilter is provided 75 solely to assist in computing the mask's bounds (if the mode requests that). 76 */ 77 static bool DrawToMask(const SkPath& devPath, const SkIRect* clipBounds, 78 const SkMaskFilter*, const SkMatrix* filterMatrix, 79 SkMask* mask, SkMask::CreateMode mode, 80 SkPaint::Style style); 81 82 enum RectType { 83 kHair_RectType, 84 kFill_RectType, 85 kStroke_RectType, 86 kPath_RectType 87 }; 88 89 /** 90 * Based on the paint's style, strokeWidth, and the matrix, classify how 91 * to draw the rect. If no special-case is available, returns 92 * kPath_RectType. 93 * 94 * Iff RectType == kStroke_RectType, then strokeSize is set to the device 95 * width and height of the stroke. 96 */ 97 static RectType ComputeRectType(const SkPaint&, const SkMatrix&, 98 SkPoint* strokeSize); 99 100 private: 101 void drawText_asPaths(const char text[], size_t byteLength, 102 SkScalar x, SkScalar y, const SkPaint&) const; 103 void drawDevMask(const SkMask& mask, const SkPaint&) const; 104 void drawBitmapAsMask(const SkBitmap&, const SkPaint&) const; 105 106 void drawPosText_asPaths(const char text[], size_t byteLength, 107 const SkScalar pos[], SkScalar constY, 108 int scalarsPerPosition, const SkPaint&) const; 109 110 /** 111 * Return the current clip bounds, in local coordinates, with slop to account 112 * for antialiasing or hairlines (i.e. device-bounds outset by 1, and then 113 * run through the inverse of the matrix). 114 * 115 * If the matrix cannot be inverted, or the current clip is empty, return 116 * false and ignore bounds parameter. 117 */ 118 bool SK_WARN_UNUSED_RESULT 119 computeConservativeLocalClipBounds(SkRect* bounds) const; 120 121 static bool ShouldDrawTextAsPaths(const SkPaint&, const SkMatrix&); 122 123 public: 124 const SkBitmap* fBitmap; // required 125 const SkMatrix* fMatrix; // required 126 const SkRegion* fClip; // DEPRECATED 127 const SkRasterClip* fRC; // required 128 129 const SkClipStack* fClipStack; // optional 130 SkDevice* fDevice; // optional 131 SkBounder* fBounder; // optional 132 SkDrawProcs* fProcs; // optional 133 134 #ifdef SK_DEBUG 135 void validate() const; 136 #else 137 void validate() const {} 138 #endif 139 }; 140 141 #endif 142
