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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkClipStack.h"
#include "SkRRect.h"
#if SK_SUPPORT_GPU
# include "GrAppliedClip.h"
# include "GrDrawContext.h"
# include "GrDrawContextPriv.h"
# include "GrFixedClip.h"
# include "GrReducedClip.h"
# include "GrRenderTargetPriv.h"
# include "GrResourceProvider.h"
# include "effects/GrTextureDomain.h"
#endif
constexpr static SkIRect kDeviceRect = {0, 0, 600, 600};
constexpr static SkIRect kLayerRect = {25, 25, 575, 575};
constexpr static SkIRect kCoverRect = {50, 50, 550, 550};
namespace skiagm {
////////////////////////////////////////////////////////////////////////////////////////////////////
class WindowRectanglesBaseGM : public GM {
protected:
virtual void onCoverClipStack(const SkClipStack&, SkCanvas*) = 0;
private:
SkISize onISize() override { return SkISize::Make(kDeviceRect.width(), kDeviceRect.height()); }
void onDraw(SkCanvas*) final;
};
void WindowRectanglesBaseGM::onDraw(SkCanvas* canvas) {
sk_tool_utils::draw_checkerboard(canvas, 0xffffffff, 0xffc6c3c6, 25);
canvas->saveLayer(SkRect::Make(kLayerRect), nullptr);
SkClipStack stack;
stack.clipRect(SkRect::MakeXYWH(370.75, 80.25, 149, 100), SkMatrix::I(),
SkCanvas::kDifference_Op, false);
stack.clipRect(SkRect::MakeXYWH(80.25, 420.75, 150, 100), SkMatrix::I(),
SkCanvas::kDifference_Op, true);
stack.clipRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(200, 200, 200, 200), 60, 45),
SkMatrix::I(), SkCanvas::kDifference_Op, true);
SkRRect nine;
nine.setNinePatch(SkRect::MakeXYWH(550 - 30.25 - 100, 370.75, 100, 150), 12, 35, 23, 20);
stack.clipRRect(nine, SkMatrix::I(), SkCanvas::kDifference_Op, true);
SkRRect complx;
SkVector complxRadii[4] = {{6, 4}, {8, 12}, {16, 24}, {48, 32}};
complx.setRectRadii(SkRect::MakeXYWH(80.25, 80.75, 100, 149), complxRadii);
stack.clipRRect(complx, SkMatrix::I(), SkCanvas::kDifference_Op, false);
this->onCoverClipStack(stack, canvas);
canvas->restore();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Draws a clip that will exercise window rectangles if they are supported.
*/
class WindowRectanglesGM : public WindowRectanglesBaseGM {
private:
SkString onShortName() final { return SkString("windowrectangles"); }
void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
};
/**
* This is a simple helper class for resetting a canvas's clip to our test’s SkClipStack.
*/
class ReplayClipStackVisitor final : public SkCanvasClipVisitor {
public:
typedef SkCanvas::ClipOp Op;
ReplayClipStackVisitor(SkCanvas* canvas) : fCanvas(canvas) {}
void clipRect(const SkRect& r, Op op, bool aa) override { fCanvas->clipRect(r, op, aa); }
void clipRRect(const SkRRect& rr, Op op, bool aa) override { fCanvas->clipRRect(rr, op, aa); }
void clipPath(const SkPath&, Op, bool) override { SkFAIL("Not implemented"); }
private:
SkCanvas* const fCanvas;
};
void WindowRectanglesGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
SkPaint paint;
paint.setColor(0xff00aa80);
// Set up the canvas's clip to match our SkClipStack.
ReplayClipStackVisitor visitor(canvas);
SkClipStack::Iter iter(stack, SkClipStack::Iter::kBottom_IterStart);
for (const SkClipStack::Element* element = iter.next(); element; element = iter.next()) {
element->replay(&visitor);
}
canvas->drawRect(SkRect::Make(kCoverRect), paint);
}
DEF_GM( return new WindowRectanglesGM(); )
////////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
constexpr static int kNumWindows = 8;
/**
* Visualizes the mask (alpha or stencil) for a clip with several window rectangles. The purpose of
* this test is to verify that window rectangles are being used during clip mask generation, and to
* visualize where the window rectangles are placed.
*
* We use window rectangles when generating the clip mask because there is no need to invest time
* defining those regions where window rectangles will be in effect during the actual draw anyway.
*
* This test works by filling the entire clip mask with a small checkerboard pattern before drawing
* it, and then covering the mask with a solid color once it has been generated. The regions inside
* window rectangles or outside the scissor should still have the initial checkerboard intact.
*/
class WindowRectanglesMaskGM : public WindowRectanglesBaseGM {
private:
constexpr static int kMaskCheckerSize = 5;
SkString onShortName() final { return SkString("windowrectangles_mask"); }
void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
void visualizeAlphaMask(GrContext*, GrDrawContext*, const GrReducedClip&, const GrPaint&);
void visualizeStencilMask(GrContext*, GrDrawContext*, const GrReducedClip&, const GrPaint&);
void stencilCheckerboard(GrDrawContext*, bool flip);
void fail(SkCanvas*);
};
/**
* Base class for GrClips that visualize a clip mask.
*/
class MaskOnlyClipBase : public GrClip {
private:
bool quickContains(const SkRect&) const final { return false; }
bool isRRect(const SkRect& rtBounds, SkRRect* rr, bool* aa) const final { return false; }
void getConservativeBounds(int width, int height, SkIRect* rect, bool* iior) const final {
rect->set(0, 0, width, height);
if (iior) {
*iior = false;
}
}
};
/**
* This class clips a cover by an alpha mask. We use it to visualize the alpha clip mask.
*/
class AlphaOnlyClip final : public MaskOnlyClipBase {
public:
AlphaOnlyClip(GrTexture* mask, int x, int y) {
int w = mask->width(), h = mask->height();
fFP = GrDeviceSpaceTextureDecalFragmentProcessor::Make(mask, SkIRect::MakeWH(w, h), {x, y});
}
private:
bool apply(GrContext*, GrDrawContext*, bool, bool, GrAppliedClip* out) const override {
out->addCoverageFP(fFP);
return true;
}
sk_sp<GrFragmentProcessor> fFP;
};
/**
* This class clips a cover by the stencil clip bit. We use it to visualize the stencil mask.
*/
class StencilOnlyClip final : public MaskOnlyClipBase {
private:
bool apply(GrContext*, GrDrawContext*, bool, bool, GrAppliedClip* out) const override {
out->addStencilClip();
return true;
}
};
void WindowRectanglesMaskGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
GrContext* ctx = canvas->getGrContext();
GrDrawContext* dc = canvas->internal_private_accessTopLayerDrawContext();
if (!ctx || !dc ||
dc->accessRenderTarget()->renderTargetPriv().maxWindowRectangles() < kNumWindows) {
this->fail(canvas);
return;
}
const GrReducedClip reducedClip(stack, SkRect::Make(kCoverRect), kNumWindows);
GrPaint paint;
paint.setAntiAlias(true);
if (!dc->isStencilBufferMultisampled()) {
paint.setColor4f(GrColor4f(0, 0.25f, 1, 1));
this->visualizeAlphaMask(ctx, dc, reducedClip, paint);
} else {
paint.setColor4f(GrColor4f(1, 0.25f, 0.25f, 1));
this->visualizeStencilMask(ctx, dc, reducedClip, paint);
}
}
void WindowRectanglesMaskGM::visualizeAlphaMask(GrContext* ctx, GrDrawContext* dc,
const GrReducedClip& reducedClip,
const GrPaint& paint) {
sk_sp<GrDrawContext> maskDC(
ctx->makeDrawContextWithFallback(SkBackingFit::kExact, kLayerRect.width(),
kLayerRect.height(), kAlpha_8_GrPixelConfig, nullptr));
if (!maskDC ||
!ctx->resourceProvider()->attachStencilAttachment(maskDC->accessRenderTarget())) {
return;
}
// Draw a checker pattern into the alpha mask so we can visualize the regions left untouched by
// the clip mask generation.
this->stencilCheckerboard(maskDC.get(), true);
maskDC->clear(nullptr, GrColorPackA4(0xff), true);
maskDC->drawContextPriv().drawAndStencilRect(StencilOnlyClip(), &GrUserStencilSettings::kUnused,
SkRegion::kDifference_Op, false, false,
SkMatrix::I(),
SkRect::MakeIWH(maskDC->width(), maskDC->height()));
reducedClip.drawAlphaClipMask(maskDC.get());
sk_sp<GrTexture> mask(maskDC->asTexture());
int x = kCoverRect.x() - kLayerRect.x(),
y = kCoverRect.y() - kLayerRect.y();
// Now visualize the alpha mask by drawing a rect over the area where it is defined. The regions
// inside window rectangles or outside the scissor should still have the initial checkerboard
// intact. (This verifies we didn't spend any time modifying those pixels in the mask.)
AlphaOnlyClip clip(mask.get(), x, y);
dc->drawRect(clip, paint, SkMatrix::I(),
SkRect::Make(SkIRect::MakeXYWH(x, y, mask->width(), mask->height())));
}
void WindowRectanglesMaskGM::visualizeStencilMask(GrContext* ctx, GrDrawContext* dc,
const GrReducedClip& reducedClip,
const GrPaint& paint) {
if (!ctx->resourceProvider()->attachStencilAttachment(dc->accessRenderTarget())) {
return;
}
// Draw a checker pattern into the stencil buffer so we can visualize the regions left untouched
// by the clip mask generation.
this->stencilCheckerboard(dc, false);
reducedClip.drawStencilClipMask(ctx, dc, {kLayerRect.x(), kLayerRect.y()});
// Now visualize the stencil mask by covering the entire render target. The regions inside
// window rectangless or outside the scissor should still have the initial checkerboard intact.
// (This verifies we didn't spend any time modifying those pixels in the mask.)
dc->drawPaint(StencilOnlyClip(), paint, SkMatrix::I());
}
void WindowRectanglesMaskGM::stencilCheckerboard(GrDrawContext* dc, bool flip) {
constexpr static GrUserStencilSettings kSetClip(
GrUserStencilSettings::StaticInit<
0,
GrUserStencilTest::kAlways,
0,
GrUserStencilOp::kSetClipBit,
GrUserStencilOp::kKeep,
0>()
);
dc->drawContextPriv().clearStencilClip(GrFixedClip::Disabled(), false);
for (int y = 0; y < kLayerRect.height(); y += kMaskCheckerSize) {
for (int x = (y & 1) == flip ? 0 : kMaskCheckerSize;
x < kLayerRect.width(); x += 2 * kMaskCheckerSize) {
SkIRect checker = SkIRect::MakeXYWH(x, y, kMaskCheckerSize, kMaskCheckerSize);
dc->drawContextPriv().stencilRect(GrNoClip(), &kSetClip, false, SkMatrix::I(),
SkRect::Make(checker));
}
}
}
void WindowRectanglesMaskGM::fail(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextAlign(SkPaint::kCenter_Align);
paint.setTextSize(20);
sk_tool_utils::set_portable_typeface(&paint);
SkString errorMsg;
errorMsg.printf("Requires GPU with %i window rectangles", kNumWindows);
canvas->clipRect(SkRect::Make(kCoverRect));
canvas->clear(SK_ColorWHITE);
canvas->drawText(errorMsg.c_str(), errorMsg.size(), SkIntToScalar(kCoverRect.centerX()),
SkIntToScalar(kCoverRect.centerY() - 10), paint);
}
DEF_GM( return new WindowRectanglesMaskGM(); )
#endif
}