src/third_party/skia/src/record/SkRecorder.cpp

   1 /*
   2  * Copyright 2014 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkRecorder.h"
   9 #include "SkPicture.h"
  10
  11 // SkCanvas will fail in mysterious ways if it doesn't know the real width and height.
  12 SkRecorder::SkRecorder(SkRecorder::Mode mode, SkRecord* record, int width, int height)
  13     : SkCanvas(width, height), fMode(mode), fRecord(record) {}
  14
  15 void SkRecorder::forgetRecord() {
  16     fRecord = NULL;
  17 }
  18
  19 // To make appending to fRecord a little less verbose.
  20 #define APPEND(T, ...) \
  21         SkNEW_PLACEMENT_ARGS(fRecord->append<SkRecords::T>(), SkRecords::T, (__VA_ARGS__))
  22
  23 // For methods which must call back into SkCanvas in kReadWrite_Mode.
  24 #define INHERITED(method, ...) if (fMode == kReadWrite_Mode) this->SkCanvas::method(__VA_ARGS__)
  25
  26 // The structs we're creating all copy their constructor arguments.  Given the way the SkRecords
  27 // framework works, sometimes they happen to technically be copied twice, which is fine and elided
  28 // into a single copy unless the class has a non-trivial copy constructor.  For classes with
  29 // non-trivial copy constructors, we skip the first copy (and its destruction) by wrapping the value
  30 // with delay_copy(), forcing the argument to be passed by const&.
  31 //
  32 // This is used below for SkBitmap, SkPaint, SkPath, and SkRegion, which all have non-trivial copy
  33 // constructors and destructors.  You'll know you've got a good candidate T if you see ~T() show up
  34 // unexpectedly on a profile of record time.  Otherwise don't bother.
  35 template <typename T>
  36 class Reference {
  37 public:
  38     Reference(const T& x) : fX(x) {}
  39     operator const T&() const { return fX; }
  40 private:
  41     const T& fX;
  42 };
  43
  44 template <typename T>
  45 static Reference<T> delay_copy(const T& x) { return Reference<T>(x); }
  46
  47 // Use copy() only for optional arguments, to be copied if present or skipped if not.
  48 // (For most types we just pass by value and let copy constructors do their thing.)
  49 template <typename T>
  50 T* SkRecorder::copy(const T* src) {
  51     if (NULL == src) {
  52         return NULL;
  53     }
  54     return SkNEW_PLACEMENT_ARGS(fRecord->alloc<T>(), T, (*src));
  55 }
  56
  57 // This copy() is for arrays.
  58 // It will work with POD or non-POD, though currently we only use it for POD.
  59 template <typename T>
  60 T* SkRecorder::copy(const T src[], unsigned count) {
  61     if (NULL == src) {
  62         return NULL;
  63     }
  64     T* dst = fRecord->alloc<T>(count);
  65     for (unsigned i = 0; i < count; i++) {
  66         SkNEW_PLACEMENT_ARGS(dst + i, T, (src[i]));
  67     }
  68     return dst;
  69 }
  70
  71 // Specialization for copying strings, using memcpy.
  72 // This measured around 2x faster for copying code points,
  73 // but I found no corresponding speedup for other arrays.
  74 template <>
  75 char* SkRecorder::copy(const char src[], unsigned count) {
  76     if (NULL == src) {
  77         return NULL;
  78     }
  79     char* dst = fRecord->alloc<char>(count);
  80     memcpy(dst, src, count);
  81     return dst;
  82 }
  83
  84 void SkRecorder::clear(SkColor color) {
  85     APPEND(Clear, color);
  86 }
  87
  88 void SkRecorder::drawPaint(const SkPaint& paint) {
  89     APPEND(DrawPaint, delay_copy(paint));
  90 }
  91
  92 void SkRecorder::drawPoints(PointMode mode,
  93                             size_t count,
  94                             const SkPoint pts[],
  95                             const SkPaint& paint) {
  96     APPEND(DrawPoints, mode, count, this->copy(pts, count), delay_copy(paint));
  97 }
  98
  99 void SkRecorder::drawRect(const SkRect& rect, const SkPaint& paint) {
 100     APPEND(DrawRect, rect, delay_copy(paint));
 101 }
 102
 103 void SkRecorder::drawOval(const SkRect& oval, const SkPaint& paint) {
 104     APPEND(DrawOval, oval, delay_copy(paint));
 105 }
 106
 107 void SkRecorder::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
 108     APPEND(DrawRRect, rrect, delay_copy(paint));
 109 }
 110
 111 void SkRecorder::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
 112     APPEND(DrawDRRect, outer, inner, delay_copy(paint));
 113 }
 114
 115 void SkRecorder::drawPath(const SkPath& path, const SkPaint& paint) {
 116     APPEND(DrawPath, delay_copy(path), delay_copy(paint));
 117 }
 118
 119 void SkRecorder::drawBitmap(const SkBitmap& bitmap,
 120                             SkScalar left,
 121                             SkScalar top,
 122                             const SkPaint* paint) {
 123     APPEND(DrawBitmap, delay_copy(bitmap), left, top, this->copy(paint));
 124 }
 125
 126 void SkRecorder::drawBitmapRectToRect(const SkBitmap& bitmap,
 127                                       const SkRect* src,
 128                                       const SkRect& dst,
 129                                       const SkPaint* paint,
 130                                       DrawBitmapRectFlags flags) {
 131     APPEND(DrawBitmapRectToRect,
 132            delay_copy(bitmap), this->copy(src), dst, this->copy(paint), flags);
 133 }
 134
 135 void SkRecorder::drawBitmapMatrix(const SkBitmap& bitmap,
 136                                   const SkMatrix& matrix,
 137                                   const SkPaint* paint) {
 138     APPEND(DrawBitmapMatrix, delay_copy(bitmap), matrix, this->copy(paint));
 139 }
 140
 141 void SkRecorder::drawBitmapNine(const SkBitmap& bitmap,
 142                                 const SkIRect& center,
 143                                 const SkRect& dst,
 144                                 const SkPaint* paint) {
 145     APPEND(DrawBitmapNine, delay_copy(bitmap), center, dst, this->copy(paint));
 146 }
 147
 148 void SkRecorder::drawSprite(const SkBitmap& bitmap, int left, int top, const SkPaint* paint) {
 149     APPEND(DrawSprite, delay_copy(bitmap), left, top, this->copy(paint));
 150 }
 151
 152 void SkRecorder::onDrawText(const void* text, size_t byteLength,
 153                             SkScalar x, SkScalar y, const SkPaint& paint) {
 154     APPEND(DrawText,
 155            this->copy((const char*)text, byteLength), byteLength, x, y, delay_copy(paint));
 156 }
 157
 158 void SkRecorder::onDrawPosText(const void* text, size_t byteLength,
 159                                const SkPoint pos[], const SkPaint& paint) {
 160     const unsigned points = paint.countText(text, byteLength);
 161     APPEND(DrawPosText,
 162            this->copy((const char*)text, byteLength), byteLength,
 163            this->copy(pos, points), delay_copy(paint));
 164 }
 165
 166 void SkRecorder::onDrawPosTextH(const void* text, size_t byteLength,
 167                                 const SkScalar xpos[], SkScalar constY, const SkPaint& paint) {
 168     const unsigned points = paint.countText(text, byteLength);
 169     APPEND(DrawPosTextH,
 170            this->copy((const char*)text, byteLength), byteLength,
 171            this->copy(xpos, points), constY, delay_copy(paint));
 172 }
 173
 174 void SkRecorder::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
 175                                   const SkMatrix* matrix, const SkPaint& paint) {
 176     APPEND(DrawTextOnPath,
 177            this->copy((const char*)text, byteLength), byteLength,
 178            delay_copy(path), this->copy(matrix), delay_copy(paint));
 179 }
 180
 181 void SkRecorder::drawPicture(SkPicture& picture) {
 182     picture.draw(this);
 183 }
 184
 185 void SkRecorder::drawVertices(VertexMode vmode,
 186                               int vertexCount, const SkPoint vertices[],
 187                               const SkPoint texs[], const SkColor colors[],
 188                               SkXfermode* xmode,
 189                               const uint16_t indices[], int indexCount, const SkPaint& paint) {
 190     APPEND(DrawVertices, vmode,
 191                          vertexCount,
 192                          this->copy(vertices, vertexCount),
 193                          texs ? this->copy(texs, vertexCount) : NULL,
 194                          colors ? this->copy(colors, vertexCount) : NULL,
 195                          xmode,
 196                          this->copy(indices, indexCount),
 197                          indexCount,
 198                          delay_copy(paint));
 199 }
 200
 201 void SkRecorder::willSave(SkCanvas::SaveFlags flags) {
 202     APPEND(Save, flags);
 203     INHERITED(willSave, flags);
 204 }
 205
 206 SkCanvas::SaveLayerStrategy SkRecorder::willSaveLayer(const SkRect* bounds,
 207                                                       const SkPaint* paint,
 208                                                       SkCanvas::SaveFlags flags) {
 209     APPEND(SaveLayer, this->copy(bounds), this->copy(paint), flags);
 210     INHERITED(willSaveLayer, bounds, paint, flags);
 211     return SkCanvas::kNoLayer_SaveLayerStrategy;
 212 }
 213
 214 void SkRecorder::willRestore() {
 215     APPEND(Restore);
 216     INHERITED(willRestore);
 217 }
 218
 219 void SkRecorder::onPushCull(const SkRect& rect) {
 220     APPEND(PushCull, rect);
 221 }
 222
 223 void SkRecorder::onPopCull() {
 224     APPEND(PopCull);
 225 }
 226
 227 void SkRecorder::didConcat(const SkMatrix& matrix) {
 228     APPEND(Concat, matrix);
 229     INHERITED(didConcat, matrix);
 230 }
 231
 232 void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
 233     APPEND(SetMatrix, matrix);
 234     INHERITED(didSetMatrix, matrix);
 235 }
 236
 237 void SkRecorder::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 238     APPEND(ClipRect, rect, op, edgeStyle == kSoft_ClipEdgeStyle);
 239     INHERITED(onClipRect, rect, op, edgeStyle);
 240 }
 241
 242 void SkRecorder::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 243     APPEND(ClipRRect, rrect, op, edgeStyle == kSoft_ClipEdgeStyle);
 244     INHERITED(updateClipConservativelyUsingBounds, rrect.getBounds(), op, false);
 245 }
 246
 247 void SkRecorder::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 248     APPEND(ClipPath, delay_copy(path), op, edgeStyle == kSoft_ClipEdgeStyle);
 249     INHERITED(updateClipConservativelyUsingBounds, path.getBounds(), op, path.isInverseFillType());
 250 }
 251
 252 void SkRecorder::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
 253     APPEND(ClipRegion, delay_copy(deviceRgn), op);
 254     INHERITED(onClipRegion, deviceRgn, op);
 255 }