3 * Copyright 2007 The Android Open Source Project
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
10 #ifndef SkPicture_DEFINED
11 #define SkPicture_DEFINED
14 #include "SkDrawPictureCallback.h"
15 #include "SkImageDecoder.h"
17 #include "SkTDArray.h"
23 class SkBBoxHierarchy;
27 class SkPictureRecord;
37 The SkPicture class records the drawing commands made to a canvas, to
38 be played back at a later time.
40 class SK_API SkPicture : public SkRefCnt {
42 SK_DECLARE_INST_COUNT(SkPicture)
44 // AccelData provides a base class for device-specific acceleration
45 // data. It is added to the picture via a call to a device's optimize
47 class AccelData : public SkRefCnt {
49 typedef uint8_t Domain;
52 AccelData(Key key) : fKey(key) { }
54 const Key& getKey() const { return fKey; }
56 // This entry point allows user's to get a unique domain prefix
58 static Domain GenerateDomain();
62 typedef SkRefCnt INHERITED;
65 /** PRIVATE / EXPERIMENTAL -- do not call */
66 void EXPERIMENTAL_addAccelData(const AccelData*) const;
68 /** PRIVATE / EXPERIMENTAL -- do not call */
69 const AccelData* EXPERIMENTAL_getAccelData(AccelData::Key) const;
72 * Function signature defining a function that sets up an SkBitmap from encoded data. On
73 * success, the SkBitmap should have its Config, width, height, rowBytes and pixelref set.
74 * If the installed pixelref has decoded the data into pixels, then the src buffer need not be
75 * copied. If the pixelref defers the actual decode until its lockPixels() is called, then it
76 * must make a copy of the src buffer.
77 * @param src Encoded data.
78 * @param length Size of the encoded data, in bytes.
79 * @param dst SkBitmap to install the pixel ref on.
80 * @param bool Whether or not a pixel ref was successfully installed.
82 typedef bool (*InstallPixelRefProc)(const void* src, size_t length, SkBitmap* dst);
85 * Recreate a picture that was serialized into a stream.
86 * @param SkStream Serialized picture data.
87 * @param proc Function pointer for installing pixelrefs on SkBitmaps representing the
88 * encoded bitmap data from the stream.
89 * @return A new SkPicture representing the serialized data, or NULL if the stream is
92 static SkPicture* CreateFromStream(SkStream*,
93 InstallPixelRefProc proc = &SkImageDecoder::DecodeMemory);
96 * Recreate a picture that was serialized into a buffer. If the creation requires bitmap
97 * decoding, the decoder must be set on the SkReadBuffer parameter by calling
98 * SkReadBuffer::setBitmapDecoder() before calling SkPicture::CreateFromBuffer().
99 * @param SkReadBuffer Serialized picture data.
100 * @return A new SkPicture representing the serialized data, or NULL if the buffer is
103 static SkPicture* CreateFromBuffer(SkReadBuffer&);
105 virtual ~SkPicture();
107 #ifdef SK_SUPPORT_LEGACY_PICTURE_CLONE
109 * Creates a thread-safe clone of the picture that is ready for playback.
111 SkPicture* clone() const;
114 /** Replays the drawing commands on the specified canvas. Note that
115 this has the effect of unfurling this picture into the destination
116 canvas. Using the SkCanvas::drawPicture entry point gives the destination
117 canvas the option of just taking a ref.
118 @param canvas the canvas receiving the drawing commands.
119 @param callback a callback that allows interruption of playback
121 void playback(SkCanvas* canvas, SkDrawPictureCallback* = NULL) const;
123 #ifdef SK_LEGACY_PICTURE_DRAW_API
124 void draw(SkCanvas* canvas, SkDrawPictureCallback* callback = NULL) const {
125 this->playback(canvas, callback);
129 #ifdef SK_LEGACY_PICTURE_SIZE_API
130 int width() const { return SkScalarCeilToInt(fCullWidth); }
131 int height() const { return SkScalarCeilToInt(fCullHeight); }
134 /** Return the cull rect used when creating this picture: { 0, 0, cullWidth, cullHeight }.
135 It does not necessarily reflect the bounds of what has been recorded into the picture.
136 @return the cull rect used to create this picture
138 const SkRect cullRect() const { return SkRect::MakeWH(fCullWidth, fCullHeight); }
140 /** Return a non-zero, unique value representing the picture. This call is
141 only valid when not recording. Between a beginRecording/endRecording
142 pair it will just return 0 (the invalid ID). Each beginRecording/
143 endRecording pair will cause a different generation ID to be returned.
145 uint32_t uniqueID() const;
148 * Function to encode an SkBitmap to an SkData. A function with this
149 * signature can be passed to serialize() and SkWriteBuffer.
150 * Returning NULL will tell the SkWriteBuffer to use
151 * SkBitmap::flatten() to store the bitmap.
153 * @param pixelRefOffset DEPRECATED -- caller assumes it will return 0.
154 * @return SkData If non-NULL, holds encoded data representing the passed
155 * in bitmap. The caller is responsible for calling unref().
157 typedef SkData* (*EncodeBitmap)(size_t* pixelRefOffset, const SkBitmap& bm);
160 * Serialize to a stream. If non NULL, encoder will be used to encode
161 * any bitmaps in the picture.
162 * encoder will never be called with a NULL pixelRefOffset.
164 void serialize(SkWStream*, EncodeBitmap encoder = NULL) const;
167 * Serialize to a buffer.
169 void flatten(SkWriteBuffer&) const;
172 * Returns true if any bitmaps may be produced when this SkPicture
175 bool willPlayBackBitmaps() const;
177 /** Return true if the SkStream/Buffer represents a serialized picture, and
178 fills out SkPictInfo. After this function returns, the data source is not
179 rewound so it will have to be manually reset before passing to
180 CreateFromStream or CreateFromBuffer. Note, CreateFromStream and
181 CreateFromBuffer perform this check internally so these entry points are
182 intended for stand alone tools.
183 If false is returned, SkPictInfo is unmodified.
185 static bool InternalOnly_StreamIsSKP(SkStream*, SkPictInfo*);
186 static bool InternalOnly_BufferIsSKP(SkReadBuffer*, SkPictInfo*);
188 /** Return true if the picture is suitable for rendering on the GPU.
192 bool suitableForGpuRasterization(GrContext*, const char ** = NULL) const;
195 class DeletionListener : public SkRefCnt {
197 virtual void onDeletion(uint32_t pictureID) = 0;
200 // Takes ref on listener.
201 void addDeletionListener(DeletionListener* listener) const;
203 /** Return the approximate number of operations in this picture. This
204 * number may be greater or less than the number of SkCanvas calls
205 * recorded: some calls may be recorded as more than one operation, or some
206 * calls may be optimized away.
208 int approximateOpCount() const;
210 /** Return true if this picture contains text.
212 bool hasText() const;
215 // V2 : adds SkPixelRef's generation ID.
216 // V3 : PictInfo tag at beginning, and EOF tag at the end
217 // V4 : move SkPictInfo to be the header
218 // V5 : don't read/write FunctionPtr on cross-process (we can detect that)
219 // V6 : added serialization of SkPath's bounds (and packed its flags tighter)
220 // V7 : changed drawBitmapRect(IRect) to drawBitmapRectToRect(Rect)
221 // V8 : Add an option for encoding bitmaps
222 // V9 : Allow the reader and writer of an SKP disagree on whether to support
223 // SK_SUPPORT_HINTING_SCALE_FACTOR
224 // V10: add drawRRect, drawOval, clipRRect
225 // V11: modify how readBitmap and writeBitmap store their info.
226 // V12: add conics to SkPath, use new SkPathRef flattening
227 // V13: add flag to drawBitmapRectToRect
228 // parameterize blurs by sigma rather than radius
229 // V14: Add flags word to PathRef serialization
230 // V15: Remove A1 bitmap config (and renumber remaining configs)
231 // V16: Move SkPath's isOval flag to SkPathRef
232 // V17: SkPixelRef now writes SkImageInfo
233 // V18: SkBitmap now records x,y for its pixelref origin, instead of offset.
234 // V19: encode matrices and regions into the ops stream
235 // V20: added bool to SkPictureImageFilter's serialization (to allow SkPicture serialization)
236 // V21: add pushCull, popCull
237 // V22: SK_PICT_FACTORY_TAG's size is now the chunk size in bytes
238 // V23: SkPaint::FilterLevel became a real enum
239 // V24: SkTwoPointConicalGradient now has fFlipped flag for gradient flipping
240 // V25: SkDashPathEffect now only writes phase and interval array when flattening
241 // V26: Removed boolean from SkColorShader for inheriting color from SkPaint.
242 // V27: Remove SkUnitMapper from gradients (and skia).
243 // V28: No longer call bitmap::flatten inside SkWriteBuffer::writeBitmap.
244 // V29: Removed SaveFlags parameter from save().
245 // V30: Remove redundant SkMatrix from SkLocalMatrixShader.
246 // V31: Add a serialized UniqueID to SkImageFilter.
247 // V32: Removed SkPaintOptionsAndroid from SkPaint
248 // V33: Serialize only public API of effects.
249 // V34: Add SkTextBlob serialization.
250 // V35: Store SkRect (rather then width & height) in header
252 // Note: If the picture version needs to be increased then please follow the
253 // steps to generate new SKPs in (only accessible to Googlers): http://goo.gl/qATVcw
255 // Only SKPs within the min/current picture version range (inclusive) can be read.
256 static const uint32_t MIN_PICTURE_VERSION = 19;
257 static const uint32_t CURRENT_PICTURE_VERSION = 35;
259 mutable uint32_t fUniqueID;
261 // TODO: make SkPictureData const when clone method goes away
262 SkAutoTDelete<SkPictureData> fData;
263 const SkScalar fCullWidth;
264 const SkScalar fCullHeight;
265 mutable SkAutoTUnref<const AccelData> fAccelData;
267 mutable SkTDArray<DeletionListener*> fDeletionListeners; // pointers are refed
269 void needsNewGenID() { fUniqueID = SK_InvalidGenID; }
270 void callDeletionListeners();
272 // Create a new SkPicture from an existing SkPictureData. The new picture
273 // takes ownership of 'data'.
274 SkPicture(SkPictureData* data, SkScalar width, SkScalar height);
276 SkPicture(SkScalar width, SkScalar height, const SkPictureRecord& record, bool deepCopyOps);
278 // An OperationList encapsulates a set of operation offsets into the picture byte
279 // stream along with the CTMs needed for those operation.
280 class OperationList : ::SkNoncopyable {
282 // The following three entry points should only be accessed if
283 // 'valid' returns true.
284 int numOps() const { return fOps.count(); }
285 // The offset in the picture of the operation to execute.
286 uint32_t offset(int index) const;
287 // The CTM that must be installed for the operation to behave correctly
288 const SkMatrix& matrix(int index) const;
290 SkTDArray<void*> fOps;
293 void createHeader(SkPictInfo* info) const;
294 static bool IsValidPictInfo(const SkPictInfo& info);
296 friend class SkPictureData; // to access OperationList
297 friend class SkPictureRecorder; // just for SkPicture-based constructor
298 friend class SkGpuDevice; // for fData access
299 friend class GrLayerHoister; // access to fRecord
300 friend class CollectLayers; // access to fRecord
301 friend class SkPicturePlayback; // to get fData & OperationList
302 friend class SkPictureReplacementPlayback; // to access OperationList
304 typedef SkRefCnt INHERITED;
306 // Takes ownership of the SkRecord, refs the (optional) BBH.
307 SkPicture(SkScalar width, SkScalar height, SkRecord*, SkBBoxHierarchy*);
308 // Return as a new SkPicture that's backed by SkRecord.
309 static SkPicture* Forwardport(const SkPicture&);
311 SkAutoTDelete<SkRecord> fRecord;
312 SkAutoTUnref<SkBBoxHierarchy> fBBH;
317 Analysis() {} // Only used by SkPictureData codepath.
318 explicit Analysis(const SkRecord&);
320 bool suitableForGpuRasterization(const char** reason, int sampleCount) const;
322 bool fWillPlaybackBitmaps;
324 int fNumPaintWithPathEffectUses;
325 int fNumFastPathDashEffects;
326 int fNumAAConcavePaths;
327 int fNumAAHairlineConcavePaths;