chromium/third_party/skia/src/gpu/ganesh/ops/DashOp.cpp

/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "src/gpu/ganesh/ops/DashOp.h"

#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPathEffect.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkString.h"
#include "include/core/SkStrokeRec.h"
#include "include/gpu/ganesh/GrRecordingContext.h"
#include "include/private/SkColorData.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkPoint_impl.h"
#include "include/private/base/SkTArray.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "src/base/SkArenaAlloc.h"
#include "src/base/SkSafeMath.h"
#include "src/core/SkMatrixPriv.h"
#include "src/core/SkPointPriv.h"
#include "src/core/SkSLTypeShared.h"
#include "src/gpu/BufferWriter.h"
#include "src/gpu/KeyBuilder.h"
#include "src/gpu/ganesh/GrAppliedClip.h"
#include "src/gpu/ganesh/GrColor.h"
#include "src/gpu/ganesh/GrDefaultGeoProcFactory.h"
#include "src/gpu/ganesh/GrGeometryProcessor.h"
#include "src/gpu/ganesh/GrOpFlushState.h"
#include "src/gpu/ganesh/GrPaint.h"
#include "src/gpu/ganesh/GrPipeline.h"
#include "src/gpu/ganesh/GrProcessorAnalysis.h"
#include "src/gpu/ganesh/GrProcessorSet.h"
#include "src/gpu/ganesh/GrProcessorUnitTest.h"
#include "src/gpu/ganesh/GrProgramInfo.h"
#include "src/gpu/ganesh/GrStyle.h"
#include "src/gpu/ganesh/GrUserStencilSettings.h"
#include "src/gpu/ganesh/geometry/GrQuad.h"
#include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/ganesh/glsl/GrGLSLProgramDataManager.h"
#include "src/gpu/ganesh/glsl/GrGLSLVarying.h"
#include "src/gpu/ganesh/glsl/GrGLSLVertexGeoBuilder.h"
#include "src/gpu/ganesh/ops/GrDrawOp.h"
#include "src/gpu/ganesh/ops/GrMeshDrawOp.h"
#include "src/gpu/ganesh/ops/GrSimpleMeshDrawOpHelper.h"

#if defined(GPU_TEST_UTILS)
#include "src/base/SkRandom.h"
#include "src/gpu/ganesh/GrDrawOpTest.h"
#include "src/gpu/ganesh/GrTestUtils.h"
#endif

#include <algorithm>
#include <cstdint>
#include <cstring>
#include <memory>
#include <utility>

class GrCaps;
class GrDstProxyView;
class GrGLSLUniformHandler;
class GrMeshDrawTarget;
class GrSurfaceProxyView;
enum class GrXferBarrierFlags;
struct GrShaderCaps;
struct GrSimpleMesh;

namespace skgpu {
namespace ganesh {
class SurfaceDrawContext;
}
}  // namespace skgpu

usingnamespaceskia_private;

AAMode;

#if defined(GPU_TEST_UTILS)
constexpr int kAAModeCnt = static_cast<int>(skgpu::ganesh::DashOp::AAMode::kCoverageWithMSAA) + 1;
#endif

namespace skgpu::ganesh::DashOp {

namespace … // anonymous namespace

/////////////////////////////////////////////////////////////////////////////////////////////////

GrOp::Owner MakeDashLineOp(GrRecordingContext* context,
                           GrPaint&& paint,
                           const SkMatrix& viewMatrix,
                           const SkPoint pts[2],
                           AAMode aaMode,
                           const GrStyle& style,
                           const GrUserStencilSettings* stencilSettings) { … }

// Returns whether or not the gpu can fast path the dash line effect.
bool CanDrawDashLine(const SkPoint pts[2], const GrStyle& style, const SkMatrix& viewMatrix) { … }

} // namespace skgpu::ganesh::DashOp

#if defined(GPU_TEST_UTILS)

GR_DRAW_OP_TEST_DEFINE(DashOpImpl) {
    SkMatrix viewMatrix = GrTest::TestMatrixPreservesRightAngles(random);
    AAMode aaMode;
    do {
        aaMode = static_cast<AAMode>(random->nextULessThan(kAAModeCnt));
    } while (AAMode::kCoverageWithMSAA == aaMode && numSamples <= 1);

    // We can only dash either horizontal or vertical lines
    SkPoint pts[2];
    if (random->nextBool()) {
        // vertical
        pts[0].fX = 1.f;
        pts[0].fY = random->nextF() * 10.f;
        pts[1].fX = 1.f;
        pts[1].fY = random->nextF() * 10.f;
    } else {
        // horizontal
        pts[0].fX = random->nextF() * 10.f;
        pts[0].fY = 1.f;
        pts[1].fX = random->nextF() * 10.f;
        pts[1].fY = 1.f;
    }

    // pick random cap
    SkPaint::Cap cap = SkPaint::Cap(random->nextULessThan(SkPaint::kCapCount));

    SkScalar intervals[2];

    // We can only dash with the following intervals
    enum Intervals {
        kOpenOpen_Intervals ,
        kOpenClose_Intervals,
        kCloseOpen_Intervals,
    };

    Intervals intervalType = SkPaint::kRound_Cap == cap ?
                             kOpenClose_Intervals :
                             Intervals(random->nextULessThan(kCloseOpen_Intervals + 1));
    static const SkScalar kIntervalMin = 0.1f;
    static const SkScalar kIntervalMinCircles = 1.f; // Must be >= to stroke width
    static const SkScalar kIntervalMax = 10.f;
    switch (intervalType) {
        case kOpenOpen_Intervals:
            intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax);
            intervals[1] = random->nextRangeScalar(kIntervalMin, kIntervalMax);
            break;
        case kOpenClose_Intervals: {
            intervals[0] = 0.f;
            SkScalar min = SkPaint::kRound_Cap == cap ? kIntervalMinCircles : kIntervalMin;
            intervals[1] = random->nextRangeScalar(min, kIntervalMax);
            break;
        }
        case kCloseOpen_Intervals:
            intervals[0] = random->nextRangeScalar(kIntervalMin, kIntervalMax);
            intervals[1] = 0.f;
            break;

    }

    // phase is 0 < sum (i0, i1)
    SkScalar phase = random->nextRangeScalar(0, intervals[0] + intervals[1]);

    SkPaint p;
    p.setStyle(SkPaint::kStroke_Style);
    p.setStrokeWidth(SkIntToScalar(1));
    p.setStrokeCap(cap);
    p.setPathEffect(GrTest::TestDashPathEffect::Make(intervals, 2, phase));

    GrStyle style(p);

    return skgpu::ganesh::DashOp::MakeDashLineOp(context, std::move(paint), viewMatrix, pts, aaMode,
                                                 style, GrGetRandomStencil(random, context));
}

#endif // defined(GPU_TEST_UTILS)