SkPicture.h revision 4e8e3421aa919a82eb1dd287fecbd079f5a320b4
1 2/* 3 * Copyright 2007 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 SkPicture_DEFINED 11#define SkPicture_DEFINED 12 13#include "SkBitmap.h" 14#include "SkDrawPictureCallback.h" 15#include "SkImageDecoder.h" 16#include "SkRefCnt.h" 17#include "SkTDArray.h" 18 19#if SK_SUPPORT_GPU 20class GrContext; 21#endif 22 23class SkBBoxHierarchy; 24class SkCanvas; 25class SkData; 26class SkPictureData; 27class SkPictureRecord; 28class SkStream; 29class SkWStream; 30 31struct SkPictInfo; 32 33class SkRecord; 34 35namespace SkRecords { 36 class CollectLayers; 37}; 38 39/** \class SkPicture 40 41 The SkPicture class records the drawing commands made to a canvas, to 42 be played back at a later time. 43*/ 44class SK_API SkPicture : public SkRefCnt { 45public: 46 SK_DECLARE_INST_COUNT(SkPicture) 47 48 // AccelData provides a base class for device-specific acceleration 49 // data. It is added to the picture via a call to a device's optimize 50 // method. 51 class AccelData : public SkRefCnt { 52 public: 53 typedef uint8_t Domain; 54 typedef uint32_t Key; 55 56 AccelData(Key key) : fKey(key) { } 57 58 const Key& getKey() const { return fKey; } 59 60 // This entry point allows user's to get a unique domain prefix 61 // for their keys 62 static Domain GenerateDomain(); 63 private: 64 Key fKey; 65 66 typedef SkRefCnt INHERITED; 67 }; 68 69 /** PRIVATE / EXPERIMENTAL -- do not call */ 70 void EXPERIMENTAL_addAccelData(const AccelData*) const; 71 72 /** PRIVATE / EXPERIMENTAL -- do not call */ 73 const AccelData* EXPERIMENTAL_getAccelData(AccelData::Key) const; 74 75 /** 76 * Function signature defining a function that sets up an SkBitmap from encoded data. On 77 * success, the SkBitmap should have its Config, width, height, rowBytes and pixelref set. 78 * If the installed pixelref has decoded the data into pixels, then the src buffer need not be 79 * copied. If the pixelref defers the actual decode until its lockPixels() is called, then it 80 * must make a copy of the src buffer. 81 * @param src Encoded data. 82 * @param length Size of the encoded data, in bytes. 83 * @param dst SkBitmap to install the pixel ref on. 84 * @param bool Whether or not a pixel ref was successfully installed. 85 */ 86 typedef bool (*InstallPixelRefProc)(const void* src, size_t length, SkBitmap* dst); 87 88 /** 89 * Recreate a picture that was serialized into a stream. 90 * @param SkStream Serialized picture data. 91 * @param proc Function pointer for installing pixelrefs on SkBitmaps representing the 92 * encoded bitmap data from the stream. 93 * @return A new SkPicture representing the serialized data, or NULL if the stream is 94 * invalid. 95 */ 96 static SkPicture* CreateFromStream(SkStream*, 97 InstallPixelRefProc proc = &SkImageDecoder::DecodeMemory); 98 99 /** 100 * Recreate a picture that was serialized into a buffer. If the creation requires bitmap 101 * decoding, the decoder must be set on the SkReadBuffer parameter by calling 102 * SkReadBuffer::setBitmapDecoder() before calling SkPicture::CreateFromBuffer(). 103 * @param SkReadBuffer Serialized picture data. 104 * @return A new SkPicture representing the serialized data, or NULL if the buffer is 105 * invalid. 106 */ 107 static SkPicture* CreateFromBuffer(SkReadBuffer&); 108 109 virtual ~SkPicture(); 110 111 /** Replays the drawing commands on the specified canvas. Note that 112 this has the effect of unfurling this picture into the destination 113 canvas. Using the SkCanvas::drawPicture entry point gives the destination 114 canvas the option of just taking a ref. 115 @param canvas the canvas receiving the drawing commands. 116 @param callback a callback that allows interruption of playback 117 */ 118 void playback(SkCanvas* canvas, SkDrawPictureCallback* = NULL) const; 119 120#ifdef SK_LEGACY_PICTURE_DRAW_API 121 void draw(SkCanvas* canvas, SkDrawPictureCallback* callback = NULL) const { 122 this->playback(canvas, callback); 123 } 124#endif 125 126#ifdef SK_LEGACY_PICTURE_SIZE_API 127 int width() const { return SkScalarCeilToInt(fCullWidth); } 128 int height() const { return SkScalarCeilToInt(fCullHeight); } 129#endif 130 131 /** Return the cull rect used when creating this picture: { 0, 0, cullWidth, cullHeight }. 132 It does not necessarily reflect the bounds of what has been recorded into the picture. 133 @return the cull rect used to create this picture 134 */ 135 const SkRect cullRect() const { return SkRect::MakeWH(fCullWidth, fCullHeight); } 136 137 /** Return a non-zero, unique value representing the picture. This call is 138 only valid when not recording. Between a beginRecording/endRecording 139 pair it will just return 0 (the invalid ID). Each beginRecording/ 140 endRecording pair will cause a different generation ID to be returned. 141 */ 142 uint32_t uniqueID() const; 143 144 /** 145 * Function to encode an SkBitmap to an SkData. A function with this 146 * signature can be passed to serialize() and SkWriteBuffer. 147 * Returning NULL will tell the SkWriteBuffer to use 148 * SkBitmap::flatten() to store the bitmap. 149 * 150 * @param pixelRefOffset DEPRECATED -- caller assumes it will return 0. 151 * @return SkData If non-NULL, holds encoded data representing the passed 152 * in bitmap. The caller is responsible for calling unref(). 153 */ 154 typedef SkData* (*EncodeBitmap)(size_t* pixelRefOffset, const SkBitmap& bm); 155 156 /** 157 * Serialize to a stream. If non NULL, encoder will be used to encode 158 * any bitmaps in the picture. 159 * encoder will never be called with a NULL pixelRefOffset. 160 */ 161 void serialize(SkWStream*, EncodeBitmap encoder = NULL) const; 162 163 /** 164 * Serialize to a buffer. 165 */ 166 void flatten(SkWriteBuffer&) const; 167 168 /** 169 * Returns true if any bitmaps may be produced when this SkPicture 170 * is replayed. 171 */ 172 bool willPlayBackBitmaps() const; 173 174 /** Return true if the SkStream/Buffer represents a serialized picture, and 175 fills out SkPictInfo. After this function returns, the data source is not 176 rewound so it will have to be manually reset before passing to 177 CreateFromStream or CreateFromBuffer. Note, CreateFromStream and 178 CreateFromBuffer perform this check internally so these entry points are 179 intended for stand alone tools. 180 If false is returned, SkPictInfo is unmodified. 181 */ 182 static bool InternalOnly_StreamIsSKP(SkStream*, SkPictInfo*); 183 static bool InternalOnly_BufferIsSKP(SkReadBuffer*, SkPictInfo*); 184 185 /** Return true if the picture is suitable for rendering on the GPU. 186 */ 187 188#if SK_SUPPORT_GPU 189 bool suitableForGpuRasterization(GrContext*, const char ** = NULL) const; 190#endif 191 192 class DeletionListener : public SkRefCnt { 193 public: 194 virtual void onDeletion(uint32_t pictureID) = 0; 195 }; 196 197 // Takes ref on listener. 198 void addDeletionListener(DeletionListener* listener) const; 199 200 /** Return the approximate number of operations in this picture. This 201 * number may be greater or less than the number of SkCanvas calls 202 * recorded: some calls may be recorded as more than one operation, or some 203 * calls may be optimized away. 204 */ 205 int approximateOpCount() const; 206 207 /** Return true if this picture contains text. 208 */ 209 bool hasText() const; 210 211private: 212 // V2 : adds SkPixelRef's generation ID. 213 // V3 : PictInfo tag at beginning, and EOF tag at the end 214 // V4 : move SkPictInfo to be the header 215 // V5 : don't read/write FunctionPtr on cross-process (we can detect that) 216 // V6 : added serialization of SkPath's bounds (and packed its flags tighter) 217 // V7 : changed drawBitmapRect(IRect) to drawBitmapRectToRect(Rect) 218 // V8 : Add an option for encoding bitmaps 219 // V9 : Allow the reader and writer of an SKP disagree on whether to support 220 // SK_SUPPORT_HINTING_SCALE_FACTOR 221 // V10: add drawRRect, drawOval, clipRRect 222 // V11: modify how readBitmap and writeBitmap store their info. 223 // V12: add conics to SkPath, use new SkPathRef flattening 224 // V13: add flag to drawBitmapRectToRect 225 // parameterize blurs by sigma rather than radius 226 // V14: Add flags word to PathRef serialization 227 // V15: Remove A1 bitmap config (and renumber remaining configs) 228 // V16: Move SkPath's isOval flag to SkPathRef 229 // V17: SkPixelRef now writes SkImageInfo 230 // V18: SkBitmap now records x,y for its pixelref origin, instead of offset. 231 // V19: encode matrices and regions into the ops stream 232 // V20: added bool to SkPictureImageFilter's serialization (to allow SkPicture serialization) 233 // V21: add pushCull, popCull 234 // V22: SK_PICT_FACTORY_TAG's size is now the chunk size in bytes 235 // V23: SkPaint::FilterLevel became a real enum 236 // V24: SkTwoPointConicalGradient now has fFlipped flag for gradient flipping 237 // V25: SkDashPathEffect now only writes phase and interval array when flattening 238 // V26: Removed boolean from SkColorShader for inheriting color from SkPaint. 239 // V27: Remove SkUnitMapper from gradients (and skia). 240 // V28: No longer call bitmap::flatten inside SkWriteBuffer::writeBitmap. 241 // V29: Removed SaveFlags parameter from save(). 242 // V30: Remove redundant SkMatrix from SkLocalMatrixShader. 243 // V31: Add a serialized UniqueID to SkImageFilter. 244 // V32: Removed SkPaintOptionsAndroid from SkPaint 245 // V33: Serialize only public API of effects. 246 // V34: Add SkTextBlob serialization. 247 // V35: Store SkRect (rather then width & height) in header 248 // V36: Remove (obsolete) alphatype from SkColorTable 249 // V37: Added shadow only option to SkDropShadowImageFilter 250 251 // Note: If the picture version needs to be increased then please follow the 252 // steps to generate new SKPs in (only accessible to Googlers): http://goo.gl/qATVcw 253 254 // Only SKPs within the min/current picture version range (inclusive) can be read. 255 static const uint32_t MIN_PICTURE_VERSION = 19; 256 static const uint32_t CURRENT_PICTURE_VERSION = 37; 257 258 mutable uint32_t fUniqueID; 259 260 SkAutoTDelete<const SkPictureData> fData; 261 const SkScalar fCullWidth; 262 const SkScalar fCullHeight; 263 mutable SkAutoTUnref<const AccelData> fAccelData; 264 265 mutable SkTDArray<DeletionListener*> fDeletionListeners; // pointers are refed 266 267 void needsNewGenID() { fUniqueID = SK_InvalidGenID; } 268 void callDeletionListeners(); 269 270 // Create a new SkPicture from an existing SkPictureData. The new picture 271 // takes ownership of 'data'. 272 SkPicture(SkPictureData* data, SkScalar width, SkScalar height); 273 274 SkPicture(SkScalar width, SkScalar height, const SkPictureRecord& record, bool deepCopyOps); 275 276 void createHeader(SkPictInfo* info) const; 277 static bool IsValidPictInfo(const SkPictInfo& info); 278 279 friend class SkPictureRecorder; // SkRecord-based constructor. 280 friend class SkGpuDevice; // for fData access 281 friend class GrLayerHoister; // access to fRecord 282 friend class SkPicturePlayback; // to get fData 283 friend class ReplaceDraw; 284 285 typedef SkRefCnt INHERITED; 286 287 // Takes ownership of the SkRecord, refs the (optional) BBH. 288 SkPicture(SkScalar width, SkScalar height, SkRecord*, SkBBoxHierarchy*); 289 // Return as a new SkPicture that's backed by SkRecord. 290 static SkPicture* Forwardport(const SkPicture&); 291 // Return as a new SkPicture that's backed by the old backend. 292 static SkPicture* Backport(const SkRecord& src, const SkRect& cullRect); 293 294 SkAutoTDelete<SkRecord> fRecord; 295 SkAutoTUnref<SkBBoxHierarchy> fBBH; 296 297 struct PathCounter; 298 299 struct Analysis { 300 Analysis() {} // Only used by SkPictureData codepath. 301 explicit Analysis(const SkRecord&); 302 303 bool suitableForGpuRasterization(const char** reason, int sampleCount) const; 304 305 bool fWillPlaybackBitmaps; 306 bool fHasText; 307 int fNumPaintWithPathEffectUses; 308 int fNumFastPathDashEffects; 309 int fNumAAConcavePaths; 310 int fNumAAHairlineConcavePaths; 311 int fNumAADFEligibleConcavePaths; 312 } fAnalysis; 313}; 314 315#endif 316