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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 SkCanvasPriv_DEFINED
#define SkCanvasPriv_DEFINED
#include "include/core/SkCanvas.h"
#include "include/private/SkNoncopyable.h"
class SkReadBuffer;
class SkWriteBuffer;
namespace skgpu {
class SurfaceFillContext;
#if SK_GPU_V1
namespace v1 { class SurfaceDrawContext; }
#endif // SK_GPU_V1
#endif // GR_TEST_UTILS
// This declaration must match the one in SkDeferredDisplayList.h
class GrRenderTargetProxy;
using GrRenderTargetProxy = SkRefCnt;
#endif // SK_SUPPORT_GPU
class SkAutoCanvasMatrixPaint : SkNoncopyable {
SkAutoCanvasMatrixPaint(SkCanvas*, const SkMatrix*, const SkPaint*, const SkRect& bounds);
SkCanvas* fCanvas;
int fSaveCount;
class SkCanvasPriv {
// The lattice has pointers directly into the readbuffer
static bool ReadLattice(SkReadBuffer&, SkCanvas::Lattice*);
static void WriteLattice(SkWriteBuffer&, const SkCanvas::Lattice&);
// return the byte-size of the lattice, even if the buffer is null
// storage must be 4-byte aligned
static size_t WriteLattice(void* storage, const SkCanvas::Lattice&);
static int SaveBehind(SkCanvas* canvas, const SkRect* subset) {
return canvas->only_axis_aligned_saveBehind(subset);
static void DrawBehind(SkCanvas* canvas, const SkPaint& paint) {
// Exposed for testing on non-Android framework builds
static void ResetClip(SkCanvas* canvas) {
#if SK_GPU_V1
static skgpu::v1::SurfaceDrawContext* TopDeviceSurfaceDrawContext(SkCanvas*);
static skgpu::SurfaceFillContext* TopDeviceSurfaceFillContext(SkCanvas*);
#endif // GR_TEST_UTILS
static GrRenderTargetProxy* TopDeviceTargetProxy(SkCanvas*);
// The experimental_DrawEdgeAAImageSet API accepts separate dstClips and preViewMatrices arrays,
// where entries refer into them, but no explicit size is provided. Given a set of entries,
// computes the minimum length for these arrays that would provide index access errors.
static void GetDstClipAndMatrixCounts(const SkCanvas::ImageSetEntry set[], int count,
int* totalDstClipCount, int* totalMatrixCount);
static SkCanvas::SaveLayerRec ScaledBackdropLayer(const SkRect* bounds,
const SkPaint* paint,
const SkImageFilter* backdrop,
SkScalar backdropScale,
SkCanvas::SaveLayerFlags saveLayerFlags) {
return SkCanvas::SaveLayerRec(bounds, paint, backdrop, backdropScale, saveLayerFlags);
static SkScalar GetBackdropScaleFactor(const SkCanvas::SaveLayerRec& rec) {
return rec.fExperimentalBackdropScale;
static void SetBackdropScaleFactor(SkCanvas::SaveLayerRec* rec, SkScalar scale) {
rec->fExperimentalBackdropScale = scale;
static void DrawCustomMesh(SkCanvas*,
SkCustomMesh cm,
sk_sp<SkBlender> blender,
const SkPaint& paint);
* This constant is trying to balance the speed of ref'ing a subpicture into a parent picture,
* against the playback cost of recursing into the subpicture to get at its actual ops.
* For now we pick a conservatively small value, though measurement (and other heuristics like
* the type of ops contained) may justify changing this value.
constexpr int kMaxPictureOpsToUnrollInsteadOfRef = 1;