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mock_canvas.h
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mock_canvas.h
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TESTING_MOCK_CANVAS_H_
#define TESTING_MOCK_CANVAS_H_
#include <ostream>
#include <variant>
#include <vector>
#include "flutter/testing/assertions_skia.h"
#include "gtest/gtest.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkCanvasVirtualEnforcer.h"
#include "third_party/skia/include/core/SkClipOp.h"
#include "third_party/skia/include/core/SkData.h"
#include "third_party/skia/include/core/SkImageFilter.h"
#include "third_party/skia/include/core/SkM44.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkRRect.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/utils/SkNWayCanvas.h"
namespace flutter {
namespace testing {
static constexpr SkRect kEmptyRect = SkRect::MakeEmpty();
// Mock |SkCanvas|, useful for writing tests that use Skia but do not interact
// with the GPU.
//
// The |MockCanvas| stores a list of |DrawCall| that the test can later verify
// against the expected list of primitives to be drawn.
class MockCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
public:
using SkCanvas::kHard_ClipEdgeStyle;
using SkCanvas::kSoft_ClipEdgeStyle;
struct SaveData {
int save_to_layer;
};
struct SaveLayerData {
SkRect save_bounds;
SkPaint restore_paint;
sk_sp<SkImageFilter> backdrop_filter;
int save_to_layer;
};
struct RestoreData {
int restore_to_layer;
};
struct ConcatMatrixData {
SkMatrix matrix;
};
struct ConcatMatrix44Data {
SkM44 matrix;
};
struct SetMatrixData {
SkMatrix matrix;
};
struct DrawRectData {
SkRect rect;
SkPaint paint;
};
struct DrawPathData {
SkPath path;
SkPaint paint;
};
struct DrawTextData {
sk_sp<SkData> serialized_text;
SkPaint paint;
SkPoint offset;
};
struct DrawPictureData {
sk_sp<SkData> serialized_picture;
SkPaint paint;
SkMatrix matrix;
};
struct DrawShadowData {
SkPath path;
};
struct ClipRectData {
SkRect rect;
SkClipOp clip_op;
ClipEdgeStyle style;
};
struct ClipRRectData {
SkRRect rrect;
SkClipOp clip_op;
ClipEdgeStyle style;
};
struct ClipPathData {
SkPath path;
SkClipOp clip_op;
ClipEdgeStyle style;
};
// Discriminated union of all the different |DrawCall| types. It is roughly
// equivalent to the different methods in |SkCanvas|' public API.
using DrawCallData = std::variant<SaveData,
SaveLayerData,
RestoreData,
ConcatMatrixData,
ConcatMatrix44Data,
SetMatrixData,
DrawRectData,
DrawPathData,
DrawTextData,
DrawPictureData,
DrawShadowData,
ClipRectData,
ClipRRectData,
ClipPathData>;
// A single call made against this canvas.
struct DrawCall {
int layer;
DrawCallData data;
};
MockCanvas();
~MockCanvas() override;
SkNWayCanvas* internal_canvas() { return &internal_canvas_; }
const std::vector<DrawCall>& draw_calls() const { return draw_calls_; }
protected:
// Save/restore/set operations that we track.
void willSave() override;
SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec& rec) override;
void willRestore() override;
void didRestore() override {}
void didConcat(const SkMatrix& matrix) override;
void didConcat44(const SkM44&) override;
void didScale(SkScalar x, SkScalar y) override;
void didTranslate(SkScalar x, SkScalar y) override;
void didSetMatrix(const SkMatrix& matrix) override;
// Draw and clip operations that we track.
void onDrawRect(const SkRect& rect, const SkPaint& paint) override;
void onDrawPath(const SkPath& path, const SkPaint& paint) override;
void onDrawTextBlob(const SkTextBlob* text,
SkScalar x,
SkScalar y,
const SkPaint& paint) override;
void onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) override;
void onDrawPicture(const SkPicture* picture,
const SkMatrix* matrix,
const SkPaint* paint) override;
void onClipRect(const SkRect& rect,
SkClipOp op,
ClipEdgeStyle style) override;
void onClipRRect(const SkRRect& rrect,
SkClipOp op,
ClipEdgeStyle style) override;
void onClipPath(const SkPath& path,
SkClipOp op,
ClipEdgeStyle style) override;
// Operations that we don't track.
bool onDoSaveBehind(const SkRect*) override;
void onDrawAnnotation(const SkRect&, const char[], SkData*) override;
void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
void onDrawPatch(const SkPoint[12],
const SkColor[4],
const SkPoint[4],
SkBlendMode,
const SkPaint&) override;
void onDrawPaint(const SkPaint&) override;
void onDrawBehind(const SkPaint&) override;
void onDrawPoints(PointMode,
size_t,
const SkPoint[],
const SkPaint&) override;
void onDrawRegion(const SkRegion&, const SkPaint&) override;
void onDrawOval(const SkRect&, const SkPaint&) override;
void onDrawArc(const SkRect&,
SkScalar,
SkScalar,
bool,
const SkPaint&) override;
void onDrawRRect(const SkRRect&, const SkPaint&) override;
void onDrawImage(const SkImage* image,
SkScalar x,
SkScalar y,
const SkPaint* paint) override;
void onDrawImageRect(const SkImage*,
const SkRect*,
const SkRect&,
const SkPaint*,
SrcRectConstraint) override;
void onDrawImageNine(const SkImage*,
const SkIRect&,
const SkRect&,
const SkPaint*) override;
void onDrawImageLattice(const SkImage*,
const Lattice&,
const SkRect&,
const SkPaint*) override;
void onDrawVerticesObject(const SkVertices*,
SkBlendMode,
const SkPaint&) override;
void onDrawAtlas(const SkImage*,
const SkRSXform[],
const SkRect[],
const SkColor[],
int,
SkBlendMode,
const SkRect*,
const SkPaint*) override;
void onDrawEdgeAAQuad(const SkRect&,
const SkPoint[4],
QuadAAFlags,
const SkColor4f&,
SkBlendMode) override;
void onDrawEdgeAAImageSet(const ImageSetEntry[],
int,
const SkPoint[],
const SkMatrix[],
const SkPaint*,
SrcRectConstraint) override;
void onClipRegion(const SkRegion&, SkClipOp) override;
private:
SkNWayCanvas internal_canvas_;
std::vector<DrawCall> draw_calls_;
int current_layer_;
};
extern bool operator==(const MockCanvas::SaveData& a,
const MockCanvas::SaveData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::SaveData& data);
extern bool operator==(const MockCanvas::SaveLayerData& a,
const MockCanvas::SaveLayerData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::SaveLayerData& data);
extern bool operator==(const MockCanvas::RestoreData& a,
const MockCanvas::RestoreData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::RestoreData& data);
extern bool operator==(const MockCanvas::ConcatMatrixData& a,
const MockCanvas::ConcatMatrixData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::ConcatMatrixData& data);
extern bool operator==(const MockCanvas::ConcatMatrix44Data& a,
const MockCanvas::ConcatMatrix44Data& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::ConcatMatrix44Data& data);
extern bool operator==(const MockCanvas::SetMatrixData& a,
const MockCanvas::SetMatrixData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::SetMatrixData& data);
extern bool operator==(const MockCanvas::DrawRectData& a,
const MockCanvas::DrawRectData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawRectData& data);
extern bool operator==(const MockCanvas::DrawPathData& a,
const MockCanvas::DrawPathData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawPathData& data);
extern bool operator==(const MockCanvas::DrawTextData& a,
const MockCanvas::DrawTextData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawTextData& data);
extern bool operator==(const MockCanvas::DrawPictureData& a,
const MockCanvas::DrawPictureData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawPictureData& data);
extern bool operator==(const MockCanvas::DrawShadowData& a,
const MockCanvas::DrawShadowData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawShadowData& data);
extern bool operator==(const MockCanvas::ClipRectData& a,
const MockCanvas::ClipRectData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::ClipRectData& data);
extern bool operator==(const MockCanvas::ClipRRectData& a,
const MockCanvas::ClipRRectData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::ClipRRectData& data);
extern bool operator==(const MockCanvas::ClipPathData& a,
const MockCanvas::ClipPathData& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::ClipPathData& data);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawCallData& data);
extern bool operator==(const MockCanvas::DrawCall& a,
const MockCanvas::DrawCall& b);
extern std::ostream& operator<<(std::ostream& os,
const MockCanvas::DrawCall& draw);
} // namespace testing
} // namespace flutter
#endif // TESTING_MOCK_CANVAS_H_