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285 lines
12 KiB
285 lines
12 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.h"
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#include "sk_tool_utils.h"
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#include "SkClipStack.h"
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#include "SkRRect.h"
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#include "SkTextUtils.h"
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#include "GrAppliedClip.h"
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#include "GrCaps.h"
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#include "GrContextPriv.h"
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#include "GrReducedClip.h"
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#include "GrRenderTargetContext.h"
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#include "GrRenderTargetContextPriv.h"
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#include "GrResourceProvider.h"
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#include "GrStencilClip.h"
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#include "effects/GrTextureDomain.h"
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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 void onCoverClipStack(const SkClipStack&, SkCanvas*) = 0;
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private:
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SkISize onISize() override { return SkISize::Make(kDeviceRect.width(), kDeviceRect.height()); }
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void onDraw(SkCanvas*) final;
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};
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void WindowRectanglesBaseGM::onDraw(SkCanvas* canvas) {
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sk_tool_utils::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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this->onCoverClipStack(stack, canvas);
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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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void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
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};
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void WindowRectanglesGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
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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::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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}
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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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void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
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void visualizeAlphaMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&, GrPaint&&);
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void visualizeStencilMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&, GrPaint&&);
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void stencilCheckerboard(GrRenderTargetContext*, bool flip);
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void fail(SkCanvas*);
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};
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/**
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* Base class for GrClips that visualize a clip mask.
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*/
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class MaskOnlyClipBase : public GrClip {
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private:
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bool quickContains(const SkRect&) const final { return false; }
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bool isRRect(const SkRect& rtBounds, SkRRect* rr, GrAA*) const final { return false; }
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void getConservativeBounds(int width, int height, SkIRect* rect, bool* iior) const final {
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rect->set(0, 0, width, height);
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if (iior) {
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*iior = false;
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}
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}
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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 MaskOnlyClipBase {
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public:
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AlphaOnlyClip(sk_sp<GrTextureProxy> mask, int x, int y) : fMask(mask), fX(x), fY(y) {}
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private:
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bool apply(GrContext*, GrRenderTargetContext*, bool, bool, GrAppliedClip* out,
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SkRect* bounds) const override {
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int w = fMask->width();
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int h = fMask->height();
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out->addCoverageFP(GrDeviceSpaceTextureDecalFragmentProcessor::Make(
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fMask, SkIRect::MakeWH(w, h), {fX, fY}));
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return true;
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}
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sk_sp<GrTextureProxy> 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() {
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return GrStencilClip(SkClipStack::kEmptyGenID);
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};
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void WindowRectanglesMaskGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
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GrContext* ctx = canvas->getGrContext();
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GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
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if (!ctx || !rtc || rtc->priv().maxWindowRectangles() < kNumWindows) {
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this->fail(canvas);
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return;
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}
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const GrReducedClip reducedClip(stack, SkRect::Make(kCoverRect), rtc->caps(), kNumWindows);
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GrPaint paint;
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if (GrFSAAType::kNone == rtc->fsaaType()) {
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paint.setColor4f({ 0, 0.25f, 1, 1 });
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this->visualizeAlphaMask(ctx, rtc, 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, rtc, reducedClip, std::move(paint));
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}
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}
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void WindowRectanglesMaskGM::visualizeAlphaMask(GrContext* ctx, GrRenderTargetContext* 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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const GrBackendFormat format =
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ctx->contextPriv().caps()->getBackendFormatFromColorType(kAlpha_8_SkColorType);
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sk_sp<GrRenderTargetContext> maskRTC(
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ctx->contextPriv().makeDeferredRenderTargetContextWithFallback(
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format, SkBackingFit::kExact,
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kCoverRect.width() + padRight,
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kCoverRect.height() + padBottom,
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kAlpha_8_GrPixelConfig, nullptr));
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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(nullptr, SK_PMColor4fWHITE, GrRenderTargetContext::CanClearFullscreen::kYes);
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maskRTC->priv().drawAndStencilRect(make_stencil_only_clip(), &GrUserStencilSettings::kUnused,
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SkRegion::kDifference_Op, false, GrAA::kNo, SkMatrix::I(),
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SkRect::MakeIWH(maskRTC->width(), maskRTC->height()));
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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 clip(maskRTC->asTextureProxyRef(), x, y);
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rtc->drawRect(clip, 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(GrContext* ctx, GrRenderTargetContext* rtc,
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const GrReducedClip& reducedClip,
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GrPaint&& paint) {
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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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rtc->drawPaint(make_stencil_only_clip(), std::move(paint), SkMatrix::I());
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}
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void WindowRectanglesMaskGM::stencilCheckerboard(GrRenderTargetContext* 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->priv().clearStencilClip(GrFixedClip::Disabled(), 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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rtc->priv().stencilRect(GrNoClip(), &kSetClip, GrAAType::kNone, 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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void WindowRectanglesMaskGM::fail(SkCanvas* canvas) {
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SkFont font(sk_tool_utils::create_portable_typeface(), 20);
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SkString errorMsg;
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errorMsg.printf("Requires GPU with %i window rectangles", kNumWindows);
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canvas->clipRect(SkRect::Make(kCoverRect));
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canvas->clear(SK_ColorWHITE);
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SkTextUtils::DrawString(canvas, errorMsg.c_str(), SkIntToScalar((kCoverRect.left() + kCoverRect.right())/2),
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SkIntToScalar((kCoverRect.top() + kCoverRect.bottom())/2 - 10),
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font, SkPaint(), SkTextUtils::kCenter_Align);
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}
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DEF_GM( return new WindowRectanglesMaskGM(); )
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}
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