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* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkRecords_DEFINED
#define SkRecords_DEFINED
#include "SkCanvas.h"
#include "SkCanvasDrawable.h"
#include "SkPicture.h"
#include "SkTextBlob.h"
namespace SkRecords {
// A list of all the types of canvas calls we can record.
// Each of these is reified into a struct below.
// (We're using the macro-of-macro trick here to do several different things with the same list.)
// We leave this SK_RECORD_TYPES macro defined for use by code that wants to operate on SkRecords
// types polymorphically. (See SkRecord::Record::{visit,mutate} for an example.)
// Order doesn't technically matter here, but the compiler can generally generate better code if
// you keep them semantically grouped, especially the Draws. It's also nice to leave NoOp at 0.
#define SK_RECORD_TYPES(M) \
M(NoOp) \
M(Restore) \
M(Save) \
M(SaveLayer) \
M(SetMatrix) \
M(ClipPath) \
M(ClipRRect) \
M(ClipRect) \
M(ClipRegion) \
M(BeginCommentGroup) \
M(AddComment) \
M(EndCommentGroup) \
M(DrawBitmap) \
M(DrawBitmapNine) \
M(DrawBitmapRectToRect) \
M(DrawBitmapRectToRectBleed) \
M(DrawDrawable) \
M(DrawImage) \
M(DrawImageRect) \
M(DrawDRRect) \
M(DrawOval) \
M(DrawPaint) \
M(DrawPath) \
M(DrawPatch) \
M(DrawPicture) \
M(DrawPoints) \
M(DrawPosText) \
M(DrawPosTextH) \
M(DrawText) \
M(DrawTextOnPath) \
M(DrawRRect) \
M(DrawRect) \
M(DrawSprite) \
M(DrawTextBlob) \
// Defines SkRecords::Type, an enum of all record types.
#define ENUM(T) T##_Type,
enum Type { SK_RECORD_TYPES(ENUM) };
#undef ENUM
// Macros to make it easier to define a record for a draw call with 0 args, 1 args, 2 args, etc.
// These should be clearer when you look at their use below.
#define RECORD0(T) \
struct T { \
static const Type kType = T##_Type; \
// We try to be flexible about the types the constructors take. Instead of requring the exact type
// A here, we take any type Z which implicitly casts to A. This allows the delay_copy() trick to
// work, allowing the caller to decide whether to pass by value or by const&.
#define RECORD1(T, A, a) \
struct T { \
static const Type kType = T##_Type; \
template <typename Z> \
T(Z a) : a(a) {} \
A a; \
#define RECORD2(T, A, a, B, b) \
struct T { \
static const Type kType = T##_Type; \
template <typename Z, typename Y> \
T(Z a, Y b) : a(a), b(b) {} \
A a; B b; \
#define RECORD3(T, A, a, B, b, C, c) \
struct T { \
static const Type kType = T##_Type; \
template <typename Z, typename Y, typename X> \
T(Z a, Y b, X c) : a(a), b(b), c(c) {} \
A a; B b; C c; \
#define RECORD4(T, A, a, B, b, C, c, D, d) \
struct T { \
static const Type kType = T##_Type; \
template <typename Z, typename Y, typename X, typename W> \
T(Z a, Y b, X c, W d) : a(a), b(b), c(c), d(d) {} \
A a; B b; C c; D d; \
#define RECORD5(T, A, a, B, b, C, c, D, d, E, e) \
struct T { \
static const Type kType = T##_Type; \
template <typename Z, typename Y, typename X, typename W, typename V> \
T(Z a, Y b, X c, W d, V e) : a(a), b(b), c(c), d(d), e(e) {} \
A a; B b; C c; D d; E e; \
#define ACT_AS_PTR(ptr) \
operator T*() const { return ptr; } \
T* operator->() const { return ptr; }
template <typename T>
class RefBox : SkNoncopyable {
RefBox(T* obj) : fObj(SkSafeRef(obj)) {}
~RefBox() { SkSafeUnref(fObj); }
T* fObj;
// An Optional doesn't own the pointer's memory, but may need to destroy non-POD data.
template <typename T>
class Optional : SkNoncopyable {
Optional(T* ptr) : fPtr(ptr) {}
~Optional() { if (fPtr) fPtr->~T(); }
T* fPtr;
// Like Optional, but ptr must not be NULL.
template <typename T>
class Adopted : SkNoncopyable {
Adopted(T* ptr) : fPtr(ptr) { SkASSERT(fPtr); }
Adopted(Adopted* source) {
// Transfer ownership from source to this.
fPtr = source->fPtr;
source->fPtr = NULL;
~Adopted() { if (fPtr) fPtr->~T(); }
T* fPtr;
// PODArray doesn't own the pointer's memory, and we assume the data is POD.
template <typename T>
class PODArray {
PODArray(T* ptr) : fPtr(ptr) {}
// Default copy and assign.
T* fPtr;
#undef ACT_AS_PTR
// Like SkBitmap, but deep copies pixels if they're not immutable.
// Using this, we guarantee the immutability of all bitmaps we record.
class ImmutableBitmap : SkNoncopyable {
explicit ImmutableBitmap(const SkBitmap& bitmap) {
if (bitmap.isImmutable()) {
fBitmap = bitmap;
} else {
int width() const { return fBitmap.width(); }
int height() const { return fBitmap.height(); }
// While the pixels are immutable, SkBitmap itself is not thread-safe, so return a copy.
SkBitmap shallowCopy() const { return fBitmap; }
SkBitmap fBitmap;
// SkPath::getBounds() isn't thread safe unless we precache the bounds in a singlethreaded context.
// SkPath::cheapComputeDirection() is similar.
// Recording is a convenient time to cache these, or we can delay it to between record and playback.
struct PreCachedPath : public SkPath {
explicit PreCachedPath(const SkPath& path) : SkPath(path) {
SkPath::Direction junk;
// Like SkPath::getBounds(), SkMatrix::getType() isn't thread safe unless we precache it.
// This may not cover all SkMatrices used by the picture (e.g. some could be hiding in a shader).
struct TypedMatrix : public SkMatrix {
explicit TypedMatrix(const SkMatrix& matrix) : SkMatrix(matrix) {
RECORD2(Restore, SkIRect, devBounds, TypedMatrix, matrix);
RECORD3(SaveLayer, Optional<SkRect>, bounds, Optional<SkPaint>, paint, SkCanvas::SaveFlags, flags);
RECORD1(SetMatrix, TypedMatrix, matrix);
struct RegionOpAndAA {
RegionOpAndAA(SkRegion::Op op, bool aa) : op(op), aa(aa) {}
SkRegion::Op op : 31; // This really only needs to be 3, but there's no win today to do so.
unsigned aa : 1; // MSVC won't pack an enum with an bool, so we call this an unsigned.
SK_COMPILE_ASSERT(sizeof(RegionOpAndAA) == 4, RegionOpAndAASize);
RECORD3(ClipPath, SkIRect, devBounds, PreCachedPath, path, RegionOpAndAA, opAA);
RECORD3(ClipRRect, SkIRect, devBounds, SkRRect, rrect, RegionOpAndAA, opAA);
RECORD3(ClipRect, SkIRect, devBounds, SkRect, rect, RegionOpAndAA, opAA);
RECORD3(ClipRegion, SkIRect, devBounds, SkRegion, region, SkRegion::Op, op);
RECORD1(BeginCommentGroup, PODArray<char>, description);
RECORD2(AddComment, PODArray<char>, key, PODArray<char>, value);
// While not strictly required, if you have an SkPaint, it's fastest to put it first.
RECORD4(DrawBitmap, Optional<SkPaint>, paint,
ImmutableBitmap, bitmap,
SkScalar, left,
SkScalar, top);
RECORD4(DrawBitmapNine, Optional<SkPaint>, paint,
ImmutableBitmap, bitmap,
SkIRect, center,
SkRect, dst);
RECORD4(DrawBitmapRectToRect, Optional<SkPaint>, paint,
ImmutableBitmap, bitmap,
Optional<SkRect>, src,
SkRect, dst);
RECORD4(DrawBitmapRectToRectBleed, Optional<SkPaint>, paint,
ImmutableBitmap, bitmap,
Optional<SkRect>, src,
SkRect, dst);
RECORD3(DrawDRRect, SkPaint, paint, SkRRect, outer, SkRRect, inner);
RECORD2(DrawDrawable, SkRect, worstCaseBounds, int32_t, index);
RECORD4(DrawImage, Optional<SkPaint>, paint,
RefBox<const SkImage>, image,
SkScalar, left,
SkScalar, top);
RECORD4(DrawImageRect, Optional<SkPaint>, paint,
RefBox<const SkImage>, image,
Optional<SkRect>, src,
SkRect, dst);
RECORD2(DrawOval, SkPaint, paint, SkRect, oval);
RECORD1(DrawPaint, SkPaint, paint);
RECORD2(DrawPath, SkPaint, paint, PreCachedPath, path);
RECORD3(DrawPicture, Optional<SkPaint>, paint,
RefBox<const SkPicture>, picture,
TypedMatrix, matrix);
RECORD4(DrawPoints, SkPaint, paint, SkCanvas::PointMode, mode, unsigned, count, SkPoint*, pts);
RECORD4(DrawPosText, SkPaint, paint,
PODArray<char>, text,
size_t, byteLength,
PODArray<SkPoint>, pos);
RECORD5(DrawPosTextH, SkPaint, paint,
PODArray<char>, text,
unsigned, byteLength,
SkScalar, y,
PODArray<SkScalar>, xpos);
RECORD2(DrawRRect, SkPaint, paint, SkRRect, rrect);
RECORD2(DrawRect, SkPaint, paint, SkRect, rect);
RECORD4(DrawSprite, Optional<SkPaint>, paint, ImmutableBitmap, bitmap, int, left, int, top);
RECORD5(DrawText, SkPaint, paint,
PODArray<char>, text,
size_t, byteLength,
SkScalar, x,
SkScalar, y);
RECORD4(DrawTextBlob, SkPaint, paint,
RefBox<const SkTextBlob>, blob,
SkScalar, x,
SkScalar, y);
RECORD5(DrawTextOnPath, SkPaint, paint,
PODArray<char>, text,
size_t, byteLength,
PreCachedPath, path,
TypedMatrix, matrix);
RECORD5(DrawPatch, SkPaint, paint,
PODArray<SkPoint>, cubics,
PODArray<SkColor>, colors,
PODArray<SkPoint>, texCoords,
RefBox<SkXfermode>, xmode);
// This guy is so ugly we just write it manually.
struct DrawVertices {
static const Type kType = DrawVertices_Type;
DrawVertices(const SkPaint& paint,
SkCanvas::VertexMode vmode,
int vertexCount,
SkPoint* vertices,
SkPoint* texs,
SkColor* colors,
SkXfermode* xmode,
uint16_t* indices,
int indexCount)
: paint(paint)
, vmode(vmode)
, vertexCount(vertexCount)
, vertices(vertices)
, texs(texs)
, colors(colors)
, xmode(SkSafeRef(xmode))
, indices(indices)
, indexCount(indexCount) {}
SkPaint paint;
SkCanvas::VertexMode vmode;
int vertexCount;
PODArray<SkPoint> vertices;
PODArray<SkPoint> texs;
PODArray<SkColor> colors;
SkAutoTUnref<SkXfermode> xmode;
PODArray<uint16_t> indices;
int indexCount;
#undef RECORD0
#undef RECORD1
#undef RECORD2
#undef RECORD3
#undef RECORD4
#undef RECORD5
} // namespace SkRecords