src/third_party/skia/src/core/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 "SkPatchUtils.h"
  10 #include "SkPicture.h"
  11
  12 // SkCanvas will fail in mysterious ways if it doesn't know the real width and height.
  13 SkRecorder::SkRecorder(SkRecord* record, int width, int height)
  14     : SkCanvas(width, height), fRecord(record) {}
  15
  16 void SkRecorder::forgetRecord() {
  17     fRecord = NULL;
  18 }
  19
  20 // To make appending to fRecord a little less verbose.
  21 #define APPEND(T, ...) \
  22         SkNEW_PLACEMENT_ARGS(fRecord->append<SkRecords::T>(), SkRecords::T, (__VA_ARGS__))
  23
  24 // For methods which must call back into SkCanvas.
  25 #define INHERITED(method, ...) this->SkCanvas::method(__VA_ARGS__)
  26
  27 // The structs we're creating all copy their constructor arguments.  Given the way the SkRecords
  28 // framework works, sometimes they happen to technically be copied twice, which is fine and elided
  29 // into a single copy unless the class has a non-trivial copy constructor.  For classes with
  30 // non-trivial copy constructors, we skip the first copy (and its destruction) by wrapping the value
  31 // with delay_copy(), forcing the argument to be passed by const&.
  32 //
  33 // This is used below for SkBitmap, SkPaint, SkPath, and SkRegion, which all have non-trivial copy
  34 // constructors and destructors.  You'll know you've got a good candidate T if you see ~T() show up
  35 // unexpectedly on a profile of record time.  Otherwise don't bother.
  36 template <typename T>
  37 class Reference {
  38 public:
  39     Reference(const T& x) : fX(x) {}
  40     operator const T&() const { return fX; }
  41 private:
  42     const T& fX;
  43 };
  44
  45 template <typename T>
  46 static Reference<T> delay_copy(const T& x) { return Reference<T>(x); }
  47
  48 // Use copy() only for optional arguments, to be copied if present or skipped if not.
  49 // (For most types we just pass by value and let copy constructors do their thing.)
  50 template <typename T>
  51 T* SkRecorder::copy(const T* src) {
  52     if (NULL == src) {
  53         return NULL;
  54     }
  55     return SkNEW_PLACEMENT_ARGS(fRecord->alloc<T>(), T, (*src));
  56 }
  57
  58 // This copy() is for arrays.
  59 // It will work with POD or non-POD, though currently we only use it for POD.
  60 template <typename T>
  61 T* SkRecorder::copy(const T src[], size_t count) {
  62     if (NULL == src) {
  63         return NULL;
  64     }
  65     T* dst = fRecord->alloc<T>(count);
  66     for (size_t i = 0; i < count; i++) {
  67         SkNEW_PLACEMENT_ARGS(dst + i, T, (src[i]));
  68     }
  69     return dst;
  70 }
  71
  72 // Specialization for copying strings, using memcpy.
  73 // This measured around 2x faster for copying code points,
  74 // but I found no corresponding speedup for other arrays.
  75 template <>
  76 char* SkRecorder::copy(const char src[], size_t count) {
  77     if (NULL == src) {
  78         return NULL;
  79     }
  80     char* dst = fRecord->alloc<char>(count);
  81     memcpy(dst, src, count);
  82     return dst;
  83 }
  84
  85 void SkRecorder::clear(SkColor color) {
  86     APPEND(Clear, color);
  87 }
  88
  89 void SkRecorder::drawPaint(const SkPaint& paint) {
  90     APPEND(DrawPaint, delay_copy(paint));
  91 }
  92
  93 void SkRecorder::drawPoints(PointMode mode,
  94                             size_t count,
  95                             const SkPoint pts[],
  96                             const SkPaint& paint) {
  97     APPEND(DrawPoints, delay_copy(paint), mode, count, this->copy(pts, count));
  98 }
  99
 100 void SkRecorder::drawRect(const SkRect& rect, const SkPaint& paint) {
 101     APPEND(DrawRect, delay_copy(paint), rect);
 102 }
 103
 104 void SkRecorder::drawOval(const SkRect& oval, const SkPaint& paint) {
 105     APPEND(DrawOval, delay_copy(paint), oval);
 106 }
 107
 108 void SkRecorder::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
 109     APPEND(DrawRRect, delay_copy(paint), rrect);
 110 }
 111
 112 void SkRecorder::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
 113     APPEND(DrawDRRect, delay_copy(paint), outer, inner);
 114 }
 115
 116 void SkRecorder::drawPath(const SkPath& path, const SkPaint& paint) {
 117     APPEND(DrawPath, delay_copy(paint), delay_copy(path));
 118 }
 119
 120 void SkRecorder::drawBitmap(const SkBitmap& bitmap,
 121                             SkScalar left,
 122                             SkScalar top,
 123                             const SkPaint* paint) {
 124     APPEND(DrawBitmap, this->copy(paint), delay_copy(bitmap), left, top);
 125 }
 126
 127 void SkRecorder::drawBitmapRectToRect(const SkBitmap& bitmap,
 128                                       const SkRect* src,
 129                                       const SkRect& dst,
 130                                       const SkPaint* paint,
 131                                       DrawBitmapRectFlags flags) {
 132     APPEND(DrawBitmapRectToRect,
 133            this->copy(paint), delay_copy(bitmap), this->copy(src), dst, flags);
 134 }
 135
 136 void SkRecorder::drawBitmapMatrix(const SkBitmap& bitmap,
 137                                   const SkMatrix& matrix,
 138                                   const SkPaint* paint) {
 139     APPEND(DrawBitmapMatrix, this->copy(paint), delay_copy(bitmap), matrix);
 140 }
 141
 142 void SkRecorder::drawBitmapNine(const SkBitmap& bitmap,
 143                                 const SkIRect& center,
 144                                 const SkRect& dst,
 145                                 const SkPaint* paint) {
 146     APPEND(DrawBitmapNine, this->copy(paint), delay_copy(bitmap), center, dst);
 147 }
 148
 149 void SkRecorder::drawSprite(const SkBitmap& bitmap, int left, int top, const SkPaint* paint) {
 150     APPEND(DrawSprite, this->copy(paint), delay_copy(bitmap), left, top);
 151 }
 152
 153 void SkRecorder::onDrawText(const void* text, size_t byteLength,
 154                             SkScalar x, SkScalar y, const SkPaint& paint) {
 155     APPEND(DrawText,
 156            delay_copy(paint), this->copy((const char*)text, byteLength), byteLength, x, y);
 157 }
 158
 159 void SkRecorder::onDrawPosText(const void* text, size_t byteLength,
 160                                const SkPoint pos[], const SkPaint& paint) {
 161     const unsigned points = paint.countText(text, byteLength);
 162     APPEND(DrawPosText,
 163            delay_copy(paint),
 164            this->copy((const char*)text, byteLength),
 165            byteLength,
 166            this->copy(pos, points));
 167 }
 168
 169 void SkRecorder::onDrawPosTextH(const void* text, size_t byteLength,
 170                                 const SkScalar xpos[], SkScalar constY, const SkPaint& paint) {
 171     const unsigned points = paint.countText(text, byteLength);
 172     APPEND(DrawPosTextH,
 173            delay_copy(paint),
 174            this->copy((const char*)text, byteLength),
 175            byteLength,
 176            this->copy(xpos, points),
 177            constY);
 178 }
 179
 180 void SkRecorder::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
 181                                   const SkMatrix* matrix, const SkPaint& paint) {
 182     APPEND(DrawTextOnPath,
 183            delay_copy(paint),
 184            this->copy((const char*)text, byteLength),
 185            byteLength,
 186            delay_copy(path),
 187            this->copy(matrix));
 188 }
 189
 190 void SkRecorder::onDrawPicture(const SkPicture* pic, const SkMatrix* matrix, const SkPaint* paint) {
 191     APPEND(DrawPicture, this->copy(paint), pic, this->copy(matrix));
 192 }
 193
 194 void SkRecorder::drawVertices(VertexMode vmode,
 195                               int vertexCount, const SkPoint vertices[],
 196                               const SkPoint texs[], const SkColor colors[],
 197                               SkXfermode* xmode,
 198                               const uint16_t indices[], int indexCount, const SkPaint& paint) {
 199     APPEND(DrawVertices, delay_copy(paint),
 200                          vmode,
 201                          vertexCount,
 202                          this->copy(vertices, vertexCount),
 203                          texs ? this->copy(texs, vertexCount) : NULL,
 204                          colors ? this->copy(colors, vertexCount) : NULL,
 205                          xmode,
 206                          this->copy(indices, indexCount),
 207                          indexCount);
 208 }
 209
 210 void SkRecorder::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
 211                              const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint) {
 212     APPEND(DrawPatch, delay_copy(paint),
 213            cubics ? this->copy(cubics, SkPatchUtils::kNumCtrlPts) : NULL,
 214            colors ? this->copy(colors, SkPatchUtils::kNumCorners) : NULL,
 215            texCoords ? this->copy(texCoords, SkPatchUtils::kNumCorners) : NULL,
 216            xmode);
 217 }
 218
 219 void SkRecorder::willSave() {
 220     APPEND(Save);
 221     INHERITED(willSave);
 222 }
 223
 224 SkCanvas::SaveLayerStrategy SkRecorder::willSaveLayer(const SkRect* bounds,
 225                                                       const SkPaint* paint,
 226                                                       SkCanvas::SaveFlags flags) {
 227     APPEND(SaveLayer, this->copy(bounds), this->copy(paint), flags);
 228     INHERITED(willSaveLayer, bounds, paint, flags);
 229     return SkCanvas::kNoLayer_SaveLayerStrategy;
 230 }
 231
 232 void SkRecorder::didRestore() {
 233     APPEND(Restore, this->getTotalMatrix());
 234     INHERITED(didRestore);
 235 }
 236
 237 void SkRecorder::onPushCull(const SkRect& rect) {
 238     APPEND(PushCull, rect);
 239 }
 240
 241 void SkRecorder::onPopCull() {
 242     APPEND(PopCull);
 243 }
 244
 245 void SkRecorder::didConcat(const SkMatrix& matrix) {
 246     APPEND(Concat, matrix);
 247     INHERITED(didConcat, matrix);
 248 }
 249
 250 void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
 251     SkASSERT(matrix == this->getTotalMatrix());
 252     APPEND(SetMatrix, matrix);
 253     INHERITED(didSetMatrix, matrix);
 254 }
 255
 256 void SkRecorder::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 257     APPEND(ClipRect, rect, op, edgeStyle == kSoft_ClipEdgeStyle);
 258     INHERITED(onClipRect, rect, op, edgeStyle);
 259 }
 260
 261 void SkRecorder::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 262     APPEND(ClipRRect, rrect, op, edgeStyle == kSoft_ClipEdgeStyle);
 263     INHERITED(updateClipConservativelyUsingBounds, rrect.getBounds(), op, false);
 264 }
 265
 266 void SkRecorder::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 267     APPEND(ClipPath, delay_copy(path), op, edgeStyle == kSoft_ClipEdgeStyle);
 268     INHERITED(updateClipConservativelyUsingBounds, path.getBounds(), op, path.isInverseFillType());
 269 }
 270
 271 void SkRecorder::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
 272     APPEND(ClipRegion, delay_copy(deviceRgn), op);
 273     INHERITED(onClipRegion, deviceRgn, op);
 274 }