2 * Copyright 2016 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #include "SkClipStack.h"
13 # include "GrAppliedClip.h"
14 # include "GrRenderTargetContext.h"
15 # include "GrRenderTargetContextPriv.h"
16 # include "GrFixedClip.h"
17 # include "GrReducedClip.h"
18 # include "GrRenderTargetPriv.h"
19 # include "GrResourceProvider.h"
20 # include "effects/GrTextureDomain.h"
23 constexpr static SkIRect kDeviceRect = {0, 0, 600, 600};
24 constexpr static SkIRect kCoverRect = {50, 50, 550, 550};
28 ////////////////////////////////////////////////////////////////////////////////////////////////////
30 class WindowRectanglesBaseGM : public GM {
32 virtual void onCoverClipStack(const SkClipStack&, SkCanvas*) = 0;
35 SkISize onISize() override { return SkISize::Make(kDeviceRect.width(), kDeviceRect.height()); }
36 void onDraw(SkCanvas*) final;
39 void WindowRectanglesBaseGM::onDraw(SkCanvas* canvas) {
40 sk_tool_utils::draw_checkerboard(canvas, 0xffffffff, 0xffc6c3c6, 25);
43 stack.clipRect(SkRect::MakeXYWH(370.75, 80.25, 149, 100), SkMatrix::I(),
44 kDifference_SkClipOp, false);
45 stack.clipRect(SkRect::MakeXYWH(80.25, 420.75, 150, 100), SkMatrix::I(),
46 kDifference_SkClipOp, true);
47 stack.clipRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(200, 200, 200, 200), 60, 45),
48 SkMatrix::I(), kDifference_SkClipOp, true);
51 nine.setNinePatch(SkRect::MakeXYWH(550 - 30.25 - 100, 370.75, 100, 150), 12, 35, 23, 20);
52 stack.clipRRect(nine, SkMatrix::I(), kDifference_SkClipOp, true);
55 SkVector complxRadii[4] = {{6, 4}, {8, 12}, {16, 24}, {48, 32}};
56 complx.setRectRadii(SkRect::MakeXYWH(80.25, 80.75, 100, 149), complxRadii);
57 stack.clipRRect(complx, SkMatrix::I(), kDifference_SkClipOp, false);
59 this->onCoverClipStack(stack, canvas);
62 ////////////////////////////////////////////////////////////////////////////////////////////////////
65 * Draws a clip that will exercise window rectangles if they are supported.
67 class WindowRectanglesGM : public WindowRectanglesBaseGM {
69 SkString onShortName() final { return SkString("windowrectangles"); }
70 void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
73 void WindowRectanglesGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
75 paint.setColor(0xff00aa80);
77 // Set up the canvas's clip to match our SkClipStack.
78 SkClipStack::Iter iter(stack, SkClipStack::Iter::kBottom_IterStart);
79 for (const SkClipStack::Element* element = iter.next(); element; element = iter.next()) {
80 SkClipOp op = element->getOp();
81 bool isAA = element->isAA();
82 switch (element->getType()) {
83 case SkClipStack::Element::kPath_Type:
84 canvas->clipPath(element->getPath(), op, isAA);
86 case SkClipStack::Element::kRRect_Type:
87 canvas->clipRRect(element->getRRect(), op, isAA);
89 case SkClipStack::Element::kRect_Type:
90 canvas->clipRect(element->getRect(), op, isAA);
92 case SkClipStack::Element::kEmpty_Type:
93 canvas->clipRect({ 0, 0, 0, 0 }, kIntersect_SkClipOp, false);
98 canvas->drawRect(SkRect::Make(kCoverRect), paint);
101 DEF_GM( return new WindowRectanglesGM(); )
103 ////////////////////////////////////////////////////////////////////////////////////////////////////
107 constexpr static int kNumWindows = 8;
110 * Visualizes the mask (alpha or stencil) for a clip with several window rectangles. The purpose of
111 * this test is to verify that window rectangles are being used during clip mask generation, and to
112 * visualize where the window rectangles are placed.
114 * We use window rectangles when generating the clip mask because there is no need to invest time
115 * defining those regions where window rectangles will be in effect during the actual draw anyway.
117 * This test works by filling the entire clip mask with a small checkerboard pattern before drawing
118 * it, and then covering the mask with a solid color once it has been generated. The regions inside
119 * window rectangles or outside the scissor should still have the initial checkerboard intact.
121 class WindowRectanglesMaskGM : public WindowRectanglesBaseGM {
123 constexpr static int kMaskCheckerSize = 5;
124 SkString onShortName() final { return SkString("windowrectangles_mask"); }
125 void onCoverClipStack(const SkClipStack&, SkCanvas*) final;
126 void visualizeAlphaMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&, GrPaint&&);
127 void visualizeStencilMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&, GrPaint&&);
128 void stencilCheckerboard(GrRenderTargetContext*, bool flip);
129 void fail(SkCanvas*);
133 * Base class for GrClips that visualize a clip mask.
135 class MaskOnlyClipBase : public GrClip {
137 bool quickContains(const SkRect&) const final { return false; }
138 bool isRRect(const SkRect& rtBounds, SkRRect* rr, GrAA*) const final { return false; }
139 void getConservativeBounds(int width, int height, SkIRect* rect, bool* iior) const final {
140 rect->set(0, 0, width, height);
148 * This class clips a cover by an alpha mask. We use it to visualize the alpha clip mask.
150 class AlphaOnlyClip final : public MaskOnlyClipBase {
152 AlphaOnlyClip(GrContext* context, sk_sp<GrTextureProxy> mask, int x, int y) {
153 int w = mask->width(), h = mask->height();
154 fFP = GrDeviceSpaceTextureDecalFragmentProcessor::Make(context, std::move(mask),
155 SkIRect::MakeWH(w, h), {x, y});
158 bool apply(GrContext*, GrRenderTargetContext*, bool, bool, GrAppliedClip* out,
159 SkRect* bounds) const override {
160 out->addCoverageFP(fFP);
163 sk_sp<GrFragmentProcessor> fFP;
167 * This class clips a cover by the stencil clip bit. We use it to visualize the stencil mask.
169 class StencilOnlyClip final : public MaskOnlyClipBase {
171 bool apply(GrContext*, GrRenderTargetContext*, bool, bool, GrAppliedClip* out,
172 SkRect* bounds) const override {
173 out->addStencilClip();
178 void WindowRectanglesMaskGM::onCoverClipStack(const SkClipStack& stack, SkCanvas* canvas) {
179 GrContext* ctx = canvas->getGrContext();
180 GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
182 if (!ctx || !rtc || rtc->priv().maxWindowRectangles() < kNumWindows) {
187 const GrReducedClip reducedClip(stack, SkRect::Make(kCoverRect), kNumWindows);
190 if (!rtc->isStencilBufferMultisampled()) {
191 paint.setColor4f(GrColor4f(0, 0.25f, 1, 1));
192 this->visualizeAlphaMask(ctx, rtc, reducedClip, std::move(paint));
194 paint.setColor4f(GrColor4f(1, 0.25f, 0.25f, 1));
195 this->visualizeStencilMask(ctx, rtc, reducedClip, std::move(paint));
199 void WindowRectanglesMaskGM::visualizeAlphaMask(GrContext* ctx, GrRenderTargetContext* rtc,
200 const GrReducedClip& reducedClip, GrPaint&& paint) {
201 const int padRight = (kDeviceRect.right() - kCoverRect.right()) / 2;
202 const int padBottom = (kDeviceRect.bottom() - kCoverRect.bottom()) / 2;
203 sk_sp<GrRenderTargetContext> maskRTC(
204 ctx->makeRenderTargetContextWithFallback(SkBackingFit::kExact,
205 kCoverRect.width() + padRight,
206 kCoverRect.height() + padBottom,
207 kAlpha_8_GrPixelConfig, nullptr));
209 !ctx->resourceProvider()->attachStencilAttachment(maskRTC->accessRenderTarget())) {
213 // Draw a checker pattern into the alpha mask so we can visualize the regions left untouched by
214 // the clip mask generation.
215 this->stencilCheckerboard(maskRTC.get(), true);
216 maskRTC->clear(nullptr, GrColorPackA4(0xff), true);
217 maskRTC->priv().drawAndStencilRect(StencilOnlyClip(), &GrUserStencilSettings::kUnused,
218 SkRegion::kDifference_Op, false, GrAA::kNo, SkMatrix::I(),
219 SkRect::MakeIWH(maskRTC->width(), maskRTC->height()));
220 reducedClip.drawAlphaClipMask(maskRTC.get());
222 int x = kCoverRect.x() - kDeviceRect.x(),
223 y = kCoverRect.y() - kDeviceRect.y();
225 // Now visualize the alpha mask by drawing a rect over the area where it is defined. The regions
226 // inside window rectangles or outside the scissor should still have the initial checkerboard
227 // intact. (This verifies we didn't spend any time modifying those pixels in the mask.)
228 AlphaOnlyClip clip(ctx, maskRTC->asTextureProxyRef(), x, y);
229 rtc->drawRect(clip, std::move(paint), GrAA::kYes, SkMatrix::I(),
230 SkRect::Make(SkIRect::MakeXYWH(x, y, maskRTC->width(), maskRTC->height())));
233 void WindowRectanglesMaskGM::visualizeStencilMask(GrContext* ctx, GrRenderTargetContext* rtc,
234 const GrReducedClip& reducedClip,
236 if (!ctx->resourceProvider()->attachStencilAttachment(rtc->accessRenderTarget())) {
240 // Draw a checker pattern into the stencil buffer so we can visualize the regions left untouched
241 // by the clip mask generation.
242 this->stencilCheckerboard(rtc, false);
243 reducedClip.drawStencilClipMask(ctx, rtc);
245 // Now visualize the stencil mask by covering the entire render target. The regions inside
246 // window rectangless or outside the scissor should still have the initial checkerboard intact.
247 // (This verifies we didn't spend any time modifying those pixels in the mask.)
248 rtc->drawPaint(StencilOnlyClip(), std::move(paint), SkMatrix::I());
251 void WindowRectanglesMaskGM::stencilCheckerboard(GrRenderTargetContext* rtc, bool flip) {
252 constexpr static GrUserStencilSettings kSetClip(
253 GrUserStencilSettings::StaticInit<
255 GrUserStencilTest::kAlways,
257 GrUserStencilOp::kSetClipBit,
258 GrUserStencilOp::kKeep,
262 rtc->priv().clearStencilClip(GrFixedClip::Disabled(), false);
264 for (int y = 0; y < kDeviceRect.height(); y += kMaskCheckerSize) {
265 for (int x = (y & 1) == flip ? 0 : kMaskCheckerSize;
266 x < kDeviceRect.width(); x += 2 * kMaskCheckerSize) {
267 SkIRect checker = SkIRect::MakeXYWH(x, y, kMaskCheckerSize, kMaskCheckerSize);
268 rtc->priv().stencilRect(GrNoClip(), &kSetClip, GrAAType::kNone, SkMatrix::I(),
269 SkRect::Make(checker));
274 void WindowRectanglesMaskGM::fail(SkCanvas* canvas) {
276 paint.setAntiAlias(true);
277 paint.setTextAlign(SkPaint::kCenter_Align);
278 paint.setTextSize(20);
279 sk_tool_utils::set_portable_typeface(&paint);
282 errorMsg.printf("Requires GPU with %i window rectangles", kNumWindows);
284 canvas->clipRect(SkRect::Make(kCoverRect));
285 canvas->clear(SK_ColorWHITE);
286 canvas->drawText(errorMsg.c_str(), errorMsg.size(), SkIntToScalar(kCoverRect.centerX()),
287 SkIntToScalar(kCoverRect.centerY() - 10), paint);
290 DEF_GM( return new WindowRectanglesMaskGM(); )