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308 lines
13 KiB
308 lines
13 KiB
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkClipOp.h"
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#include "include/core/SkColorSpace.h"
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#include "include/core/SkImageInfo.h"
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#include "include/core/SkMatrix.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRRect.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkRegion.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkTypes.h"
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#include "include/gpu/GrBackendSurface.h"
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#include "include/gpu/GrRecordingContext.h"
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#include "include/private/GrTypesPriv.h"
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#include "include/private/SkColorData.h"
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#include "src/core/SkCanvasPriv.h"
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#include "src/core/SkClipOpPriv.h"
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#include "src/core/SkClipStack.h"
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#include "src/gpu/GrAppliedClip.h"
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#include "src/gpu/GrCaps.h"
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#include "src/gpu/GrClip.h"
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#include "src/gpu/GrFragmentProcessor.h"
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#include "src/gpu/GrPaint.h"
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#include "src/gpu/GrRecordingContextPriv.h"
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#include "src/gpu/GrReducedClip.h"
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#include "src/gpu/GrStencilClip.h"
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#include "src/gpu/GrSurfaceDrawContext.h"
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#include "src/gpu/GrTextureProxy.h"
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#include "src/gpu/GrUserStencilSettings.h"
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#include "src/gpu/effects/generated/GrDeviceSpaceEffect.h"
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#include "tools/ToolUtils.h"
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#include <utility>
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class GrRecordingContext;
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constexpr static SkIRect kDeviceRect = {0, 0, 600, 600};
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constexpr static SkIRect kCoverRect = {50, 50, 550, 550};
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namespace skiagm {
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class WindowRectanglesBaseGM : public GM {
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protected:
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virtual DrawResult onCoverClipStack(const SkClipStack&, SkCanvas*, SkString* errorMsg) = 0;
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private:
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SkISize onISize() override { return SkISize::Make(kDeviceRect.width(), kDeviceRect.height()); }
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DrawResult onDraw(SkCanvas*, SkString* errorMsg) final;
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};
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DrawResult WindowRectanglesBaseGM::onDraw(SkCanvas* canvas, SkString* errorMsg) {
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ToolUtils::draw_checkerboard(canvas, 0xffffffff, 0xffc6c3c6, 25);
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SkClipStack stack;
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stack.clipRect(SkRect::MakeXYWH(370.75, 80.25, 149, 100), SkMatrix::I(),
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kDifference_SkClipOp, false);
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stack.clipRect(SkRect::MakeXYWH(80.25, 420.75, 150, 100), SkMatrix::I(),
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kDifference_SkClipOp, true);
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stack.clipRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(200, 200, 200, 200), 60, 45),
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SkMatrix::I(), kDifference_SkClipOp, true);
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SkRRect nine;
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nine.setNinePatch(SkRect::MakeXYWH(550 - 30.25 - 100, 370.75, 100, 150), 12, 35, 23, 20);
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stack.clipRRect(nine, SkMatrix::I(), kDifference_SkClipOp, true);
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SkRRect complx;
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SkVector complxRadii[4] = {{6, 4}, {8, 12}, {16, 24}, {48, 32}};
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complx.setRectRadii(SkRect::MakeXYWH(80.25, 80.75, 100, 149), complxRadii);
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stack.clipRRect(complx, SkMatrix::I(), kDifference_SkClipOp, false);
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return this->onCoverClipStack(stack, canvas, errorMsg);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Draws a clip that will exercise window rectangles if they are supported.
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*/
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class WindowRectanglesGM : public WindowRectanglesBaseGM {
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private:
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SkString onShortName() final { return SkString("windowrectangles"); }
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DrawResult onCoverClipStack(const SkClipStack&, SkCanvas*, SkString* errorMsg) final;
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};
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DrawResult WindowRectanglesGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas,
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SkString* errorMsg) {
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SkPaint paint;
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paint.setColor(0xff00aa80);
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// Set up the canvas's clip to match our SkClipStack.
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SkClipStack::Iter iter(stack, SkClipStack::Iter::kBottom_IterStart);
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for (const SkClipStack::Element* element = iter.next(); element; element = iter.next()) {
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SkClipOp op = element->getOp();
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bool isAA = element->isAA();
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switch (element->getDeviceSpaceType()) {
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case SkClipStack::Element::DeviceSpaceType::kShader:
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canvas->clipShader(element->refShader(), op);
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break;
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case SkClipStack::Element::DeviceSpaceType::kPath:
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canvas->clipPath(element->getDeviceSpacePath(), op, isAA);
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break;
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case SkClipStack::Element::DeviceSpaceType::kRRect:
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canvas->clipRRect(element->getDeviceSpaceRRect(), op, isAA);
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break;
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case SkClipStack::Element::DeviceSpaceType::kRect:
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canvas->clipRect(element->getDeviceSpaceRect(), op, isAA);
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break;
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case SkClipStack::Element::DeviceSpaceType::kEmpty:
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canvas->clipRect({ 0, 0, 0, 0 }, kIntersect_SkClipOp, false);
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break;
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}
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}
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canvas->drawRect(SkRect::Make(kCoverRect), paint);
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return DrawResult::kOk;
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}
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DEF_GM( return new WindowRectanglesGM(); )
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////////////////////////////////////////////////////////////////////////////////////////////////////
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constexpr static int kNumWindows = 8;
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/**
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* Visualizes the mask (alpha or stencil) for a clip with several window rectangles. The purpose of
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* this test is to verify that window rectangles are being used during clip mask generation, and to
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* visualize where the window rectangles are placed.
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*
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* We use window rectangles when generating the clip mask because there is no need to invest time
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* defining those regions where window rectangles will be in effect during the actual draw anyway.
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*
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* This test works by filling the entire clip mask with a small checkerboard pattern before drawing
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* it, and then covering the mask with a solid color once it has been generated. The regions inside
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* window rectangles or outside the scissor should still have the initial checkerboard intact.
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*/
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class WindowRectanglesMaskGM : public WindowRectanglesBaseGM {
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private:
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constexpr static int kMaskCheckerSize = 5;
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SkString onShortName() final { return SkString("windowrectangles_mask"); }
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DrawResult onCoverClipStack(const SkClipStack&, SkCanvas*, SkString* errorMsg) final;
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void visualizeAlphaMask(GrRecordingContext*, GrSurfaceDrawContext*,
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const GrReducedClip&, GrPaint&&);
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void visualizeStencilMask(GrRecordingContext*, GrSurfaceDrawContext*,
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const GrReducedClip&, GrPaint&&);
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void stencilCheckerboard(GrSurfaceDrawContext*, bool flip);
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};
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/**
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* This class clips a cover by an alpha mask. We use it to visualize the alpha clip mask.
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*/
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class AlphaOnlyClip final : public GrClip {
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public:
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AlphaOnlyClip(GrSurfaceProxyView mask, int x, int y) : fMask(std::move(mask)), fX(x), fY(y) {}
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private:
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SkIRect getConservativeBounds() const final {
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return SkIRect::MakeXYWH(fX, fY, fMask.width(), fMask.height());
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}
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Effect apply(GrRecordingContext* ctx, GrSurfaceDrawContext*, GrAAType, bool,
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GrAppliedClip* out, SkRect* bounds) const override {
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GrSamplerState samplerState(GrSamplerState::WrapMode::kClampToBorder,
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GrSamplerState::Filter::kNearest);
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auto m = SkMatrix::Translate(-fX, -fY);
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auto subset = SkRect::Make(fMask.dimensions());
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auto domain = bounds->makeOffset(-fX, -fY).makeInset(0.5, 0.5);
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auto fp = GrTextureEffect::MakeSubset(fMask, kPremul_SkAlphaType, m, samplerState, subset,
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domain, *ctx->priv().caps());
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fp = GrDeviceSpaceEffect::Make(std::move(fp));
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out->addCoverageFP(std::move(fp));
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return Effect::kClipped;
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}
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GrSurfaceProxyView fMask;
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int fX;
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int fY;
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};
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/**
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* Makes a clip object that enforces the stencil clip bit. Used to visualize the stencil mask.
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*/
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static GrStencilClip make_stencil_only_clip(GrSurfaceDrawContext* rtc) {
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return GrStencilClip(rtc->dimensions(), SkClipStack::kEmptyGenID);
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};
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DrawResult WindowRectanglesMaskGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas,
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SkString* errorMsg) {
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auto ctx = canvas->recordingContext();
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GrSurfaceDrawContext* sdc = SkCanvasPriv::TopDeviceSurfaceDrawContext(canvas);
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if (!ctx || !sdc) {
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*errorMsg = kErrorMsg_DrawSkippedGpuOnly;
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return DrawResult::kSkip;
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}
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if (sdc->maxWindowRectangles() < kNumWindows) {
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*errorMsg = "Requires at least 8 window rectangles. "
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"(Are you off FBO 0? Use sRGB to force offscreen rendering.)";
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return DrawResult::kSkip;
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}
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const GrReducedClip reducedClip(stack, SkRect::Make(kCoverRect), sdc->caps(), kNumWindows);
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GrPaint paint;
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if (sdc->numSamples() <= 1) {
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paint.setColor4f({ 0, 0.25f, 1, 1 });
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this->visualizeAlphaMask(ctx, sdc, reducedClip, std::move(paint));
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} else {
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paint.setColor4f({ 1, 0.25f, 0.25f, 1 });
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this->visualizeStencilMask(ctx, sdc, reducedClip, std::move(paint));
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}
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return DrawResult::kOk;
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}
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void WindowRectanglesMaskGM::visualizeAlphaMask(GrRecordingContext* ctx, GrSurfaceDrawContext* rtc,
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const GrReducedClip& reducedClip, GrPaint&& paint) {
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const int padRight = (kDeviceRect.right() - kCoverRect.right()) / 2;
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const int padBottom = (kDeviceRect.bottom() - kCoverRect.bottom()) / 2;
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auto maskRTC = GrSurfaceDrawContext::MakeWithFallback(
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ctx, GrColorType::kAlpha_8, nullptr, SkBackingFit::kExact,
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{kCoverRect.width() + padRight, kCoverRect.height() + padBottom}, SkSurfaceProps());
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if (!maskRTC) {
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return;
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}
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// Draw a checker pattern into the alpha mask so we can visualize the regions left untouched by
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// the clip mask generation.
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this->stencilCheckerboard(maskRTC.get(), true);
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maskRTC->clear(SK_PMColor4fWHITE);
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GrPaint stencilPaint;
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stencilPaint.setCoverageSetOpXPFactory(SkRegion::kDifference_Op, false);
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GrStencilClip stencilClip = make_stencil_only_clip(maskRTC.get());
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maskRTC->stencilRect(&stencilClip, &GrUserStencilSettings::kUnused, std::move(stencilPaint),
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GrAA::kNo, SkMatrix::I(), SkRect::Make(maskRTC->dimensions()));
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reducedClip.drawAlphaClipMask(maskRTC.get());
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int x = kCoverRect.x() - kDeviceRect.x(),
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y = kCoverRect.y() - kDeviceRect.y();
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// Now visualize the alpha mask by drawing a rect over the area where it is defined. The regions
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// inside window rectangles or outside the scissor should still have the initial checkerboard
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// intact. (This verifies we didn't spend any time modifying those pixels in the mask.)
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AlphaOnlyClip alphaClip(maskRTC->readSurfaceView().makeSwizzle(GrSwizzle("aaaa")), x, y);
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rtc->drawRect(&alphaClip, std::move(paint), GrAA::kYes, SkMatrix::I(),
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SkRect::Make(SkIRect::MakeXYWH(x, y, maskRTC->width(), maskRTC->height())));
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}
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void WindowRectanglesMaskGM::visualizeStencilMask(GrRecordingContext* ctx,
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GrSurfaceDrawContext* rtc,
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const GrReducedClip& reducedClip,
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GrPaint&& paint) {
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if (ctx->abandoned()) {
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// GrReducedClip assumes the context hasn't been abandoned, which is reasonable since it is
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// only ever used if a draw op is made. Since this GM calls it directly, it has to be taken
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// into account.
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return;
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}
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// Draw a checker pattern into the stencil buffer so we can visualize the regions left untouched
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// by the clip mask generation.
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this->stencilCheckerboard(rtc, false);
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reducedClip.drawStencilClipMask(ctx, rtc);
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// Now visualize the stencil mask by covering the entire render target. The regions inside
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// window rectangles or outside the scissor should still have the initial checkerboard intact.
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// (This verifies we didn't spend any time modifying those pixels in the mask.)
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GrStencilClip clip = make_stencil_only_clip(rtc);
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rtc->drawPaint(&clip, std::move(paint), SkMatrix::I());
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}
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void WindowRectanglesMaskGM::stencilCheckerboard(GrSurfaceDrawContext* rtc, bool flip) {
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constexpr static GrUserStencilSettings kSetClip(
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GrUserStencilSettings::StaticInit<
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0,
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GrUserStencilTest::kAlways,
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0,
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GrUserStencilOp::kSetClipBit,
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GrUserStencilOp::kKeep,
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0>()
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);
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rtc->clearStencilClip(SkIRect::MakeSize(rtc->dimensions()), false);
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for (int y = 0; y < kDeviceRect.height(); y += kMaskCheckerSize) {
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for (int x = (y & 1) == flip ? 0 : kMaskCheckerSize;
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x < kDeviceRect.width(); x += 2 * kMaskCheckerSize) {
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SkIRect checker = SkIRect::MakeXYWH(x, y, kMaskCheckerSize, kMaskCheckerSize);
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GrPaint paint;
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paint.setXPFactory(GrDisableColorXPFactory::Get());
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rtc->stencilRect(nullptr, &kSetClip, std::move(paint), GrAA::kNo, SkMatrix::I(),
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SkRect::Make(checker));
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}
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}
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}
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DEF_GM( return new WindowRectanglesMaskGM(); )
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} // namespace skiagm
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