blob: e04d444a545e4789954f62f76b88a57f83696d4b [file] [log] [blame]
robertphillips@google.com1e945b72012-04-16 18:03:03 +00001
2/*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#include "GrClipMaskManager.h"
robertphillips@google.comfa662942012-05-17 12:20:22 +000010#include "GrAAConvexPathRenderer.h"
11#include "GrAAHairLinePathRenderer.h"
jvanverth@google.combfe2b9d2013-09-06 16:57:29 +000012#include "GrAARectRenderer.h"
bsalomon@google.comc26d94f2013-03-25 18:19:00 +000013#include "GrDrawTargetCaps.h"
bsalomon@google.comc26d94f2013-03-25 18:19:00 +000014#include "GrPaint.h"
15#include "GrPathRenderer.h"
16#include "GrRenderTarget.h"
17#include "GrStencilBuffer.h"
robertphillips@google.com58b20212012-06-27 20:44:52 +000018#include "GrSWMaskHelper.h"
joshualitt3a0cfeb2014-10-27 07:38:01 -070019#include "SkRasterClip.h"
20#include "SkStrokeRec.h"
21#include "SkTLazy.h"
joshualitta58fe352014-10-27 08:39:00 -070022#include "effects/GrTextureDomain.h"
23#include "effects/GrConvexPolyEffect.h"
24#include "effects/GrRRectEffect.h"
bsalomon@google.comc6b3e482012-12-07 20:43:52 +000025
robertphillips@google.comba998f22012-10-12 11:33:56 +000026#define GR_AA_CLIP 1
robertphillips@google.coma72eef32012-05-01 17:22:59 +000027
bsalomon@google.com8182fa02012-12-04 14:06:06 +000028typedef SkClipStack::Element Element;
bsalomon@google.com51a62862012-11-26 21:19:43 +000029
30////////////////////////////////////////////////////////////////////////////////
robertphillips@google.come79f3202014-02-11 16:30:21 +000031namespace {
rmistry@google.comfbfcd562012-08-23 18:09:54 +000032// set up the draw state to enable the aa clipping mask. Besides setting up the
bsalomon@google.com08283af2012-10-26 13:01:20 +000033// stage matrix this also alters the vertex layout
joshualitt329bf482014-10-29 12:31:28 -070034void setup_drawstate_aaclip(GrDrawTarget* gpu,
robertphillips@google.come79f3202014-02-11 16:30:21 +000035 GrTexture* result,
36 const SkIRect &devBound) {
robertphillips@google.coma72eef32012-05-01 17:22:59 +000037 GrDrawState* drawState = gpu->drawState();
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +000038 SkASSERT(drawState);
robertphillips@google.coma72eef32012-05-01 17:22:59 +000039
bsalomon@google.comb9086a02012-11-01 18:02:54 +000040 SkMatrix mat;
bsalomon@google.comc7818882013-03-20 19:19:53 +000041 // We want to use device coords to compute the texture coordinates. We set our matrix to be
42 // equal to the view matrix followed by an offset to the devBound, and then a scaling matrix to
43 // normalized coords. We apply this matrix to the vertex positions rather than local coords.
robertphillips@google.coma72eef32012-05-01 17:22:59 +000044 mat.setIDiv(result->width(), result->height());
rmistry@google.comfbfcd562012-08-23 18:09:54 +000045 mat.preTranslate(SkIntToScalar(-devBound.fLeft),
robertphillips@google.com7b112892012-07-31 15:18:21 +000046 SkIntToScalar(-devBound.fTop));
robertphillips@google.coma72eef32012-05-01 17:22:59 +000047 mat.preConcat(drawState->getViewMatrix());
48
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +000049 SkIRect domainTexels = SkIRect::MakeWH(devBound.width(), devBound.height());
bsalomon@google.com4c2443e2012-12-06 20:58:57 +000050 // This could be a long-lived effect that is cached with the alpha-mask.
joshualittb0a8a372014-09-23 09:50:21 -070051 drawState->addCoverageProcessor(
bsalomon@google.comeb6879f2013-06-13 19:34:18 +000052 GrTextureDomainEffect::Create(result,
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +000053 mat,
commit-bot@chromium.org907fbd52013-12-09 17:03:02 +000054 GrTextureDomain::MakeTexelDomain(result, domainTexels),
55 GrTextureDomain::kDecal_Mode,
humper@google.comb86add12013-07-25 18:49:07 +000056 GrTextureParams::kNone_FilterMode,
bsalomon@google.com77af6802013-10-02 13:04:56 +000057 kPosition_GrCoordSet))->unref();
robertphillips@google.coma72eef32012-05-01 17:22:59 +000058}
59
robertphillips@google.come79f3202014-02-11 16:30:21 +000060bool path_needs_SW_renderer(GrContext* context,
joshualitt329bf482014-10-29 12:31:28 -070061 GrDrawTarget* gpu,
robertphillips@google.come79f3202014-02-11 16:30:21 +000062 const SkPath& origPath,
63 const SkStrokeRec& stroke,
64 bool doAA) {
65 // the gpu alpha mask will draw the inverse paths as non-inverse to a temp buffer
66 SkTCopyOnFirstWrite<SkPath> path(origPath);
67 if (path->isInverseFillType()) {
68 path.writable()->toggleInverseFillType();
69 }
70 // last (false) parameter disallows use of the SW path renderer
bsalomon@google.com45a15f52012-12-10 19:10:17 +000071 GrPathRendererChain::DrawType type = doAA ?
72 GrPathRendererChain::kColorAntiAlias_DrawType :
73 GrPathRendererChain::kColor_DrawType;
74
robertphillips@google.come79f3202014-02-11 16:30:21 +000075 return NULL == context->getPathRenderer(*path, stroke, gpu, false, type);
76}
77
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +000078}
79
robertphillips@google.comfa662942012-05-17 12:20:22 +000080/*
81 * This method traverses the clip stack to see if the GrSoftwarePathRenderer
82 * will be used on any element. If so, it returns true to indicate that the
83 * entire clip should be rendered in SW and then uploaded en masse to the gpu.
84 */
tfarinabf54e492014-10-23 17:47:18 -070085bool GrClipMaskManager::useSWOnlyPath(const GrReducedClip::ElementList& elements) {
robertphillips@google.coma3e5c632012-05-22 18:09:26 +000086
robertphillips@google.com8a4fc402012-05-24 12:42:24 +000087 // TODO: generalize this function so that when
robertphillips@google.comfa662942012-05-17 12:20:22 +000088 // a clip gets complex enough it can just be done in SW regardless
89 // of whether it would invoke the GrSoftwarePathRenderer.
sugoi@google.com5f74cf82012-12-17 21:16:45 +000090 SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
skia.committer@gmail.comd21444a2012-12-07 02:01:25 +000091
tfarinabf54e492014-10-23 17:47:18 -070092 for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +000093 const Element* element = iter.get();
robertphillips@google.comf69a11b2012-06-15 13:58:07 +000094 // rects can always be drawn directly w/o using the software path
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +000095 // Skip rrects once we're drawing them directly.
96 if (Element::kRect_Type != element->getType()) {
97 SkPath path;
98 element->asPath(&path);
joshualitt329bf482014-10-29 12:31:28 -070099 if (path_needs_SW_renderer(this->getContext(), fClipTarget, path, stroke,
100 element->isAA())) {
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000101 return true;
102 }
robertphillips@google.comfa662942012-05-17 12:20:22 +0000103 }
robertphillips@google.comfa662942012-05-17 12:20:22 +0000104 }
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000105 return false;
robertphillips@google.coma72eef32012-05-01 17:22:59 +0000106}
107
tfarinabf54e492014-10-23 17:47:18 -0700108bool GrClipMaskManager::installClipEffects(const GrReducedClip::ElementList& elements,
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000109 GrDrawState::AutoRestoreEffects* are,
110 const SkVector& clipToRTOffset,
mtklein217daa72014-07-02 12:55:21 -0700111 const SkRect* drawBounds) {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000112
joshualitt329bf482014-10-29 12:31:28 -0700113 GrDrawState* drawState = fClipTarget->drawState();
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000114 SkRect boundsInClipSpace;
bsalomon49f085d2014-09-05 13:34:00 -0700115 if (drawBounds) {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000116 boundsInClipSpace = *drawBounds;
117 boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY);
118 }
119
120 are->set(drawState);
121 GrRenderTarget* rt = drawState->getRenderTarget();
tfarinabf54e492014-10-23 17:47:18 -0700122 GrReducedClip::ElementList::Iter iter(elements);
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000123
124 bool setARE = false;
125 bool failed = false;
126
bsalomon49f085d2014-09-05 13:34:00 -0700127 while (iter.get()) {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000128 SkRegion::Op op = iter.get()->getOp();
129 bool invert;
130 bool skip = false;
131 switch (op) {
132 case SkRegion::kReplace_Op:
133 SkASSERT(iter.get() == elements.head());
134 // Fallthrough, handled same as intersect.
135 case SkRegion::kIntersect_Op:
136 invert = false;
bsalomon49f085d2014-09-05 13:34:00 -0700137 if (drawBounds && iter.get()->contains(boundsInClipSpace)) {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000138 skip = true;
139 }
140 break;
141 case SkRegion::kDifference_Op:
142 invert = true;
143 // We don't currently have a cheap test for whether a rect is fully outside an
144 // element's primitive, so don't attempt to set skip.
145 break;
146 default:
147 failed = true;
148 break;
149 }
150 if (failed) {
151 break;
152 }
153
154 if (!skip) {
joshualittb0a8a372014-09-23 09:50:21 -0700155 GrPrimitiveEdgeType edgeType;
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000156 if (GR_AA_CLIP && iter.get()->isAA()) {
157 if (rt->isMultisampled()) {
mtklein217daa72014-07-02 12:55:21 -0700158 // Coverage based AA clips don't place nicely with MSAA.
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000159 failed = true;
160 break;
161 }
joshualittb0a8a372014-09-23 09:50:21 -0700162 edgeType =
163 invert ? kInverseFillAA_GrProcessorEdgeType : kFillAA_GrProcessorEdgeType;
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000164 } else {
joshualittb0a8a372014-09-23 09:50:21 -0700165 edgeType =
166 invert ? kInverseFillBW_GrProcessorEdgeType : kFillBW_GrProcessorEdgeType;
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000167 }
joshualittb0a8a372014-09-23 09:50:21 -0700168 SkAutoTUnref<GrFragmentProcessor> fp;
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000169 switch (iter.get()->getType()) {
170 case SkClipStack::Element::kPath_Type:
joshualittb0a8a372014-09-23 09:50:21 -0700171 fp.reset(GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(),
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000172 &clipToRTOffset));
173 break;
174 case SkClipStack::Element::kRRect_Type: {
175 SkRRect rrect = iter.get()->getRRect();
176 rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
joshualittb0a8a372014-09-23 09:50:21 -0700177 fp.reset(GrRRectEffect::Create(edgeType, rrect));
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000178 break;
179 }
180 case SkClipStack::Element::kRect_Type: {
181 SkRect rect = iter.get()->getRect();
182 rect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
joshualittb0a8a372014-09-23 09:50:21 -0700183 fp.reset(GrConvexPolyEffect::Create(edgeType, rect));
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000184 break;
185 }
186 default:
187 break;
188 }
joshualittb0a8a372014-09-23 09:50:21 -0700189 if (fp) {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000190 if (!setARE) {
joshualitt329bf482014-10-29 12:31:28 -0700191 are->set(fClipTarget->drawState());
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000192 setARE = true;
193 }
joshualitt329bf482014-10-29 12:31:28 -0700194 fClipTarget->drawState()->addCoverageProcessor(fp);
mtklein217daa72014-07-02 12:55:21 -0700195 } else {
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000196 failed = true;
197 break;
198 }
199 }
mtklein217daa72014-07-02 12:55:21 -0700200 iter.next();
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000201 }
202
203 if (failed) {
204 are->set(NULL);
205 }
206
207 return !failed;
208}
209
robertphillips@google.comf294b772012-04-27 14:29:26 +0000210////////////////////////////////////////////////////////////////////////////////
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000211// sort out what kind of clip mask needs to be created: alpha, stencil,
212// scissor, or entirely software
bsalomon@google.comeb6879f2013-06-13 19:34:18 +0000213bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn,
joshualitt77b13072014-10-27 14:51:01 -0700214 const SkRect* devBounds,
commit-bot@chromium.org3ae0e6c2014-02-11 18:24:25 +0000215 GrDrawState::AutoRestoreEffects* are,
joshualitt77b13072014-10-27 14:51:01 -0700216 GrDrawState::AutoRestoreStencil* ars,
joshualitt6db519c2014-10-29 08:48:18 -0700217 ScissorState* scissorState) {
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000218 fCurrClipMaskType = kNone_ClipMaskType;
joshualitt7a6184f2014-10-29 18:29:27 -0700219 if (kRespectClip_StencilClipMode == fClipMode) {
220 fClipMode = kIgnoreClip_StencilClipMode;
221 }
bsalomon@google.coma3201942012-06-21 19:58:20 +0000222
tfarinabf54e492014-10-23 17:47:18 -0700223 GrReducedClip::ElementList elements(16);
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000224 int32_t genID;
tfarinabf54e492014-10-23 17:47:18 -0700225 GrReducedClip::InitialState initialState;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000226 SkIRect clipSpaceIBounds;
227 bool requiresAA;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000228
joshualitt329bf482014-10-29 12:31:28 -0700229 GrDrawState* drawState = fClipTarget->drawState();
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000230
231 const GrRenderTarget* rt = drawState->getRenderTarget();
232 // GrDrawTarget should have filtered this for us
bsalomon49f085d2014-09-05 13:34:00 -0700233 SkASSERT(rt);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000234
235 bool ignoreClip = !drawState->isClipState() || clipDataIn->fClipStack->isWideOpen();
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000236 if (!ignoreClip) {
237 SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
238 clipSpaceRTIBounds.offset(clipDataIn->fOrigin);
tfarinabf54e492014-10-23 17:47:18 -0700239 GrReducedClip::ReduceClipStack(*clipDataIn->fClipStack,
240 clipSpaceRTIBounds,
241 &elements,
242 &genID,
243 &initialState,
244 &clipSpaceIBounds,
245 &requiresAA);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000246 if (elements.isEmpty()) {
tfarinabf54e492014-10-23 17:47:18 -0700247 if (GrReducedClip::kAllIn_InitialState == initialState) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000248 ignoreClip = clipSpaceIBounds == clipSpaceRTIBounds;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000249 } else {
250 return false;
251 }
252 }
253 }
254
255 if (ignoreClip) {
joshualitt77b13072014-10-27 14:51:01 -0700256 this->setDrawStateStencil(ars);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000257 return true;
258 }
259
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000260 // An element count of 4 was chosen because of the common pattern in Blink of:
261 // isect RR
262 // diff RR
263 // isect convex_poly
264 // isect convex_poly
265 // when drawing rounded div borders. This could probably be tuned based on a
266 // configuration's relative costs of switching RTs to generate a mask vs
267 // longer shaders.
268 if (elements.count() <= 4) {
269 SkVector clipToRTOffset = { SkIntToScalar(-clipDataIn->fOrigin.fX),
commit-bot@chromium.orgb21fac12014-02-07 21:13:11 +0000270 SkIntToScalar(-clipDataIn->fOrigin.fY) };
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000271 if (elements.isEmpty() ||
mtklein217daa72014-07-02 12:55:21 -0700272 (requiresAA && this->installClipEffects(elements, are, clipToRTOffset, devBounds))) {
273 SkIRect scissorSpaceIBounds(clipSpaceIBounds);
274 scissorSpaceIBounds.offset(-clipDataIn->fOrigin);
275 if (NULL == devBounds ||
276 !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) {
joshualitt77b13072014-10-27 14:51:01 -0700277 scissorState->set(scissorSpaceIBounds);
commit-bot@chromium.orge5a041c2014-03-07 19:43:43 +0000278 }
joshualitt77b13072014-10-27 14:51:01 -0700279 this->setDrawStateStencil(ars);
commit-bot@chromium.org65ee5f42014-02-04 17:49:48 +0000280 return true;
281 }
282 }
bsalomon@google.comd3066bd2014-02-03 20:09:56 +0000283
commit-bot@chromium.org65ee5f42014-02-04 17:49:48 +0000284#if GR_AA_CLIP
robertphillips@google.coma3e5c632012-05-22 18:09:26 +0000285 // If MSAA is enabled we can do everything in the stencil buffer.
robertphillips@google.comb99225c2012-07-24 18:20:10 +0000286 if (0 == rt->numSamples() && requiresAA) {
robertphillips@google.coma72eef32012-05-01 17:22:59 +0000287 GrTexture* result = NULL;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000288
289 if (this->useSWOnlyPath(elements)) {
290 // The clip geometry is complex enough that it will be more efficient to create it
291 // entirely in software
292 result = this->createSoftwareClipMask(genID,
293 initialState,
294 elements,
295 clipSpaceIBounds);
296 } else {
297 result = this->createAlphaClipMask(genID,
298 initialState,
299 elements,
300 clipSpaceIBounds);
301 }
302
bsalomon49f085d2014-09-05 13:34:00 -0700303 if (result) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000304 // The mask's top left coord should be pinned to the rounded-out top left corner of
305 // clipSpace bounds. We determine the mask's position WRT to the render target here.
306 SkIRect rtSpaceMaskBounds = clipSpaceIBounds;
307 rtSpaceMaskBounds.offset(-clipDataIn->fOrigin);
joshualitt329bf482014-10-29 12:31:28 -0700308 are->set(fClipTarget->drawState());
309 setup_drawstate_aaclip(fClipTarget, result, rtSpaceMaskBounds);
joshualitt77b13072014-10-27 14:51:01 -0700310 this->setDrawStateStencil(ars);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000311 return true;
312 }
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000313 // if alpha clip mask creation fails fall through to the non-AA code paths
robertphillips@google.comf294b772012-04-27 14:29:26 +0000314 }
315#endif // GR_AA_CLIP
316
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000317 // Either a hard (stencil buffer) clip was explicitly requested or an anti-aliased clip couldn't
318 // be created. In either case, free up the texture in the anti-aliased mask cache.
319 // TODO: this may require more investigation. Ganesh performs a lot of utility draws (e.g.,
320 // clears, InOrderDrawBuffer playbacks) that hit the stencil buffer path. These may be
321 // "incorrectly" clearing the AA cache.
robertphillips@google.com5acc0e32012-05-17 12:01:02 +0000322 fAACache.reset();
323
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000324 // use the stencil clip if we can't represent the clip as a rectangle.
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000325 SkIPoint clipSpaceToStencilSpaceOffset = -clipDataIn->fOrigin;
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000326 this->createStencilClipMask(genID,
327 initialState,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000328 elements,
329 clipSpaceIBounds,
330 clipSpaceToStencilSpaceOffset);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000331
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000332 // This must occur after createStencilClipMask. That function may change the scissor. Also, it
333 // only guarantees that the stencil mask is correct within the bounds it was passed, so we must
334 // use both stencil and scissor test to the bounds for the final draw.
335 SkIRect scissorSpaceIBounds(clipSpaceIBounds);
336 scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset);
joshualitt77b13072014-10-27 14:51:01 -0700337 scissorState->set(scissorSpaceIBounds);
338 this->setDrawStateStencil(ars);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000339 return true;
340}
341
342#define VISUALIZE_COMPLEX_CLIP 0
343
344#if VISUALIZE_COMPLEX_CLIP
tfarina@chromium.org223137f2012-11-21 22:38:36 +0000345 #include "SkRandom.h"
346 SkRandom gRandom;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000347 #define SET_RANDOM_COLOR drawState->setColor(0xff000000 | gRandom.nextU());
348#else
349 #define SET_RANDOM_COLOR
350#endif
351
352namespace {
robertphillips@google.comf294b772012-04-27 14:29:26 +0000353
354////////////////////////////////////////////////////////////////////////////////
rmistry@google.comfbfcd562012-08-23 18:09:54 +0000355// set up the OpenGL blend function to perform the specified
356// boolean operation for alpha clip mask creation
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000357void setup_boolean_blendcoeffs(GrDrawState* drawState, SkRegion::Op op) {
robertphillips@google.comf294b772012-04-27 14:29:26 +0000358
359 switch (op) {
360 case SkRegion::kReplace_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000361 drawState->setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000362 break;
363 case SkRegion::kIntersect_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000364 drawState->setBlendFunc(kDC_GrBlendCoeff, kZero_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000365 break;
366 case SkRegion::kUnion_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000367 drawState->setBlendFunc(kOne_GrBlendCoeff, kISC_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000368 break;
369 case SkRegion::kXOR_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000370 drawState->setBlendFunc(kIDC_GrBlendCoeff, kISC_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000371 break;
372 case SkRegion::kDifference_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000373 drawState->setBlendFunc(kZero_GrBlendCoeff, kISC_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000374 break;
375 case SkRegion::kReverseDifference_Op:
bsalomon@google.com47059542012-06-06 20:51:20 +0000376 drawState->setBlendFunc(kIDC_GrBlendCoeff, kZero_GrBlendCoeff);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000377 break;
378 default:
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000379 SkASSERT(false);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000380 break;
381 }
382}
383
robertphillips@google.com72176b22012-05-23 13:19:12 +0000384}
robertphillips@google.comf294b772012-04-27 14:29:26 +0000385
386////////////////////////////////////////////////////////////////////////////////
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000387bool GrClipMaskManager::drawElement(GrTexture* target,
robertphillips@google.come79f3202014-02-11 16:30:21 +0000388 const SkClipStack::Element* element,
389 GrPathRenderer* pr) {
joshualitt329bf482014-10-29 12:31:28 -0700390 GrDrawState* drawState = fClipTarget->drawState();
robertphillips@google.comf294b772012-04-27 14:29:26 +0000391
392 drawState->setRenderTarget(target->asRenderTarget());
393
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000394 // TODO: Draw rrects directly here.
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000395 switch (element->getType()) {
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000396 case Element::kEmpty_Type:
397 SkDEBUGFAIL("Should never get here with an empty element.");
398 break;
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000399 case Element::kRect_Type:
joshualittb0a8a372014-09-23 09:50:21 -0700400 // TODO: Do rects directly to the accumulator using a aa-rect GrProcessor that covers
401 // the entire mask bounds and writes 0 outside the rect.
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000402 if (element->isAA()) {
joshualitt329bf482014-10-29 12:31:28 -0700403 this->getContext()->getAARectRenderer()->fillAARect(fClipTarget,
joshualitta58fe352014-10-27 08:39:00 -0700404 element->getRect(),
405 SkMatrix::I(),
406 element->getRect());
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000407 } else {
joshualitt329bf482014-10-29 12:31:28 -0700408 fClipTarget->drawSimpleRect(element->getRect());
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000409 }
410 return true;
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000411 default: {
412 SkPath path;
413 element->asPath(&path);
jvanverthb3eb6872014-10-24 07:12:51 -0700414 path.setIsVolatile(true);
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000415 if (path.isInverseFillType()) {
416 path.toggleInverseFillType();
robertphillips@google.come79f3202014-02-11 16:30:21 +0000417 }
sugoi@google.com5f74cf82012-12-17 21:16:45 +0000418 SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
robertphillips@google.come79f3202014-02-11 16:30:21 +0000419 if (NULL == pr) {
420 GrPathRendererChain::DrawType type;
421 type = element->isAA() ? GrPathRendererChain::kColorAntiAlias_DrawType :
422 GrPathRendererChain::kColor_DrawType;
joshualitt329bf482014-10-29 12:31:28 -0700423 pr = this->getContext()->getPathRenderer(path, stroke, fClipTarget, false, type);
robertphillips@google.come79f3202014-02-11 16:30:21 +0000424 }
425 if (NULL == pr) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000426 return false;
427 }
joshualitt329bf482014-10-29 12:31:28 -0700428 pr->drawPath(path, stroke, fClipTarget, element->isAA());
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000429 break;
430 }
robertphillips@google.comf294b772012-04-27 14:29:26 +0000431 }
432 return true;
433}
434
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000435bool GrClipMaskManager::canStencilAndDrawElement(GrTexture* target,
436 const SkClipStack::Element* element,
robertphillips@google.come79f3202014-02-11 16:30:21 +0000437 GrPathRenderer** pr) {
joshualitt329bf482014-10-29 12:31:28 -0700438 GrDrawState* drawState = fClipTarget->drawState();
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000439 drawState->setRenderTarget(target->asRenderTarget());
440
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000441 if (Element::kRect_Type == element->getType()) {
442 return true;
443 } else {
444 // We shouldn't get here with an empty clip element.
445 SkASSERT(Element::kEmpty_Type != element->getType());
446 SkPath path;
447 element->asPath(&path);
448 if (path.isInverseFillType()) {
449 path.toggleInverseFillType();
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000450 }
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000451 SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
452 GrPathRendererChain::DrawType type = element->isAA() ?
453 GrPathRendererChain::kStencilAndColorAntiAlias_DrawType :
454 GrPathRendererChain::kStencilAndColor_DrawType;
joshualitt329bf482014-10-29 12:31:28 -0700455 *pr = this->getContext()->getPathRenderer(path, stroke, fClipTarget, false, type);
bsalomon49f085d2014-09-05 13:34:00 -0700456 return SkToBool(*pr);
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000457 }
458}
459
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000460void GrClipMaskManager::mergeMask(GrTexture* dstMask,
461 GrTexture* srcMask,
462 SkRegion::Op op,
commit-bot@chromium.orgfd03d4a2013-07-17 21:39:42 +0000463 const SkIRect& dstBound,
464 const SkIRect& srcBound) {
bsalomon@google.com137f1342013-05-29 21:27:53 +0000465 GrDrawState::AutoViewMatrixRestore avmr;
joshualitt329bf482014-10-29 12:31:28 -0700466 GrDrawState* drawState = fClipTarget->drawState();
bsalomon@google.com137f1342013-05-29 21:27:53 +0000467 SkAssertResult(avmr.setIdentity(drawState));
bsalomon@google.comeb6879f2013-06-13 19:34:18 +0000468 GrDrawState::AutoRestoreEffects are(drawState);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000469
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000470 drawState->setRenderTarget(dstMask->asRenderTarget());
robertphillips@google.comf294b772012-04-27 14:29:26 +0000471
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000472 setup_boolean_blendcoeffs(drawState, op);
skia.committer@gmail.com72b2e6f2012-11-08 02:03:56 +0000473
bsalomon@google.comb9086a02012-11-01 18:02:54 +0000474 SkMatrix sampleM;
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000475 sampleM.setIDiv(srcMask->width(), srcMask->height());
skia.committer@gmail.com956b3102013-07-26 07:00:58 +0000476
joshualittb0a8a372014-09-23 09:50:21 -0700477 drawState->addColorProcessor(
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000478 GrTextureDomainEffect::Create(srcMask,
479 sampleM,
commit-bot@chromium.org907fbd52013-12-09 17:03:02 +0000480 GrTextureDomain::MakeTexelDomain(srcMask, srcBound),
481 GrTextureDomain::kDecal_Mode,
humper@google.comb86add12013-07-25 18:49:07 +0000482 GrTextureParams::kNone_FilterMode))->unref();
joshualitt329bf482014-10-29 12:31:28 -0700483 fClipTarget->drawSimpleRect(SkRect::Make(dstBound));
robertphillips@google.comf294b772012-04-27 14:29:26 +0000484}
485
bsalomon427cf282014-10-16 13:41:43 -0700486GrTexture* GrClipMaskManager::createTempMask(int width, int height) {
bsalomonf2703d82014-10-28 14:33:06 -0700487 GrSurfaceDesc desc;
488 desc.fFlags = kRenderTarget_GrSurfaceFlag|kNoStencil_GrSurfaceFlag;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000489 desc.fWidth = width;
490 desc.fHeight = height;
robertphillips@google.com75b3c962012-06-07 12:08:45 +0000491 desc.fConfig = kAlpha_8_GrPixelConfig;
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000492
joshualitt329bf482014-10-29 12:31:28 -0700493 return this->getContext()->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch);
robertphillips@google.com6d62df42012-05-07 18:07:36 +0000494}
495
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000496////////////////////////////////////////////////////////////////////////////////
krajcevskiad1dc582014-06-10 15:06:47 -0700497// Return the texture currently in the cache if it exists. Otherwise, return NULL
498GrTexture* GrClipMaskManager::getCachedMaskTexture(int32_t elementsGenID,
499 const SkIRect& clipSpaceIBounds) {
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000500 bool cached = fAACache.canReuse(elementsGenID, clipSpaceIBounds);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000501 if (!cached) {
krajcevskiad1dc582014-06-10 15:06:47 -0700502 return NULL;
robertphillips@google.com8fff3562012-05-11 12:53:50 +0000503 }
504
krajcevskiad1dc582014-06-10 15:06:47 -0700505 return fAACache.getLastMask();
506}
507
508////////////////////////////////////////////////////////////////////////////////
509// Allocate a texture in the texture cache. This function returns the texture
510// allocated (or NULL on error).
511GrTexture* GrClipMaskManager::allocMaskTexture(int32_t elementsGenID,
512 const SkIRect& clipSpaceIBounds,
513 bool willUpload) {
514 // Since we are setting up the cache we should free up the
515 // currently cached mask so it can be reused.
516 fAACache.reset();
517
bsalomonf2703d82014-10-28 14:33:06 -0700518 GrSurfaceDesc desc;
519 desc.fFlags = willUpload ? kNone_GrSurfaceFlags : kRenderTarget_GrSurfaceFlag;
krajcevskiad1dc582014-06-10 15:06:47 -0700520 desc.fWidth = clipSpaceIBounds.width();
521 desc.fHeight = clipSpaceIBounds.height();
522 desc.fConfig = kRGBA_8888_GrPixelConfig;
523 if (willUpload || this->getContext()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
524 // We would always like A8 but it isn't supported on all platforms
525 desc.fConfig = kAlpha_8_GrPixelConfig;
526 }
527
528 fAACache.acquireMask(elementsGenID, desc, clipSpaceIBounds);
529 return fAACache.getLastMask();
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000530}
robertphillips@google.comf294b772012-04-27 14:29:26 +0000531
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000532////////////////////////////////////////////////////////////////////////////////
533// Create a 8-bit clip mask in alpha
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000534GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t elementsGenID,
tfarinabf54e492014-10-23 17:47:18 -0700535 GrReducedClip::InitialState initialState,
536 const GrReducedClip::ElementList& elements,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000537 const SkIRect& clipSpaceIBounds) {
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000538 SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000539
krajcevskiad1dc582014-06-10 15:06:47 -0700540 // First, check for cached texture
541 GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds);
bsalomon49f085d2014-09-05 13:34:00 -0700542 if (result) {
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000543 fCurrClipMaskType = kAlpha_ClipMaskType;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000544 return result;
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000545 }
546
krajcevskiad1dc582014-06-10 15:06:47 -0700547 // There's no texture in the cache. Let's try to allocate it then.
548 result = this->allocMaskTexture(elementsGenID, clipSpaceIBounds, false);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000549 if (NULL == result) {
robertphillips@google.comf105b102012-05-14 12:18:26 +0000550 fAACache.reset();
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000551 return NULL;
robertphillips@google.comf294b772012-04-27 14:29:26 +0000552 }
553
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000554 // The top-left of the mask corresponds to the top-left corner of the bounds.
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000555 SkVector clipToMaskOffset = {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000556 SkIntToScalar(-clipSpaceIBounds.fLeft),
557 SkIntToScalar(-clipSpaceIBounds.fTop)
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000558 };
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000559 // The texture may be larger than necessary, this rect represents the part of the texture
560 // we populate with a rasterization of the clip.
561 SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());
562
bsalomon@google.com137f1342013-05-29 21:27:53 +0000563 // Set the matrix so that rendered clip elements are transformed to mask space from clip space.
564 SkMatrix translate;
565 translate.setTranslate(clipToMaskOffset);
joshualitt329bf482014-10-29 12:31:28 -0700566 GrDrawTarget::AutoGeometryAndStatePush agasp(fClipTarget, GrDrawTarget::kReset_ASRInit,
567 &translate);
bsalomon@google.com137f1342013-05-29 21:27:53 +0000568
joshualitt329bf482014-10-29 12:31:28 -0700569 GrDrawState* drawState = fClipTarget->drawState();
bsalomon@google.com137f1342013-05-29 21:27:53 +0000570
bsalomon@google.comcf939ae2012-12-13 19:59:23 +0000571 // We're drawing a coverage mask and want coverage to be run through the blend function.
572 drawState->enableState(GrDrawState::kCoverageDrawing_StateBit);
573
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000574 // The scratch texture that we are drawing into can be substantially larger than the mask. Only
575 // clear the part that we care about.
joshualitt329bf482014-10-29 12:31:28 -0700576 fClipTarget->clear(&maskSpaceIBounds,
577 GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000,
578 true,
579 result->asRenderTarget());
skia.committer@gmail.comd9f75032012-11-09 02:01:24 +0000580
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000581 // When we use the stencil in the below loop it is important to have this clip installed.
582 // The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first
583 // pass must not set values outside of this bounds or stencil values outside the rect won't be
584 // cleared.
joshualitt329bf482014-10-29 12:31:28 -0700585 GrDrawTarget::AutoClipRestore acr(fClipTarget, maskSpaceIBounds);
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000586 drawState->enableState(GrDrawState::kClip_StateBit);
587
bsalomon427cf282014-10-16 13:41:43 -0700588 SkAutoTUnref<GrTexture> temp;
robertphillips@google.comf294b772012-04-27 14:29:26 +0000589 // walk through each clip element and perform its set op
tfarinabf54e492014-10-23 17:47:18 -0700590 for (GrReducedClip::ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000591 const Element* element = iter.get();
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000592 SkRegion::Op op = element->getOp();
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000593 bool invert = element->isInverseFilled();
robertphillips@google.comf294b772012-04-27 14:29:26 +0000594
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000595 if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
robertphillips@google.come79f3202014-02-11 16:30:21 +0000596 GrPathRenderer* pr = NULL;
597 bool useTemp = !this->canStencilAndDrawElement(result, element, &pr);
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000598 GrTexture* dst;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000599 // This is the bounds of the clip element in the space of the alpha-mask. The temporary
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000600 // mask buffer can be substantially larger than the actually clip stack element. We
601 // touch the minimum number of pixels necessary and use decal mode to combine it with
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000602 // the accumulator.
commit-bot@chromium.orgfd03d4a2013-07-17 21:39:42 +0000603 SkIRect maskSpaceElementIBounds;
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000604
605 if (useTemp) {
606 if (invert) {
607 maskSpaceElementIBounds = maskSpaceIBounds;
608 } else {
commit-bot@chromium.orgfd03d4a2013-07-17 21:39:42 +0000609 SkRect elementBounds = element->getBounds();
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000610 elementBounds.offset(clipToMaskOffset);
611 elementBounds.roundOut(&maskSpaceElementIBounds);
612 }
613
bsalomon427cf282014-10-16 13:41:43 -0700614 if (!temp) {
615 temp.reset(this->createTempMask(maskSpaceIBounds.fRight,
616 maskSpaceIBounds.fBottom));
617 if (!temp) {
618 fAACache.reset();
619 return NULL;
620 }
skia.committer@gmail.coma7aedfe2012-12-15 02:03:10 +0000621 }
bsalomon427cf282014-10-16 13:41:43 -0700622 dst = temp;
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000623 // clear the temp target and set blend to replace
joshualitt329bf482014-10-29 12:31:28 -0700624 fClipTarget->clear(&maskSpaceElementIBounds,
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000625 invert ? 0xffffffff : 0x00000000,
robertphillips@google.com56ce48a2013-10-31 21:44:25 +0000626 true,
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000627 dst->asRenderTarget());
628 setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op);
skia.committer@gmail.coma7aedfe2012-12-15 02:03:10 +0000629
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000630 } else {
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000631 // draw directly into the result with the stencil set to make the pixels affected
632 // by the clip shape be non-zero.
633 dst = result;
634 GR_STATIC_CONST_SAME_STENCIL(kStencilInElement,
635 kReplace_StencilOp,
636 kReplace_StencilOp,
637 kAlways_StencilFunc,
638 0xffff,
639 0xffff,
640 0xffff);
641 drawState->setStencil(kStencilInElement);
skia.committer@gmail.coma7aedfe2012-12-15 02:03:10 +0000642 setup_boolean_blendcoeffs(drawState, op);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000643 }
bsalomon@google.com7b7cdd12012-11-07 16:17:24 +0000644
bsalomon@google.comc6b3e482012-12-07 20:43:52 +0000645 drawState->setAlpha(invert ? 0x00 : 0xff);
bsalomon@google.comc6b3e482012-12-07 20:43:52 +0000646
robertphillips@google.come79f3202014-02-11 16:30:21 +0000647 if (!this->drawElement(dst, element, pr)) {
648 fAACache.reset();
649 return NULL;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000650 }
robertphillips@google.comf294b772012-04-27 14:29:26 +0000651
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000652 if (useTemp) {
653 // Now draw into the accumulator using the real operation and the temp buffer as a
654 // texture
655 this->mergeMask(result,
bsalomon427cf282014-10-16 13:41:43 -0700656 temp,
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000657 op,
658 maskSpaceIBounds,
659 maskSpaceElementIBounds);
660 } else {
661 // Draw to the exterior pixels (those with a zero stencil value).
662 drawState->setAlpha(invert ? 0xff : 0x00);
663 GR_STATIC_CONST_SAME_STENCIL(kDrawOutsideElement,
664 kZero_StencilOp,
665 kZero_StencilOp,
666 kEqual_StencilFunc,
667 0xffff,
668 0x0000,
669 0xffff);
670 drawState->setStencil(kDrawOutsideElement);
joshualitt329bf482014-10-29 12:31:28 -0700671 fClipTarget->drawSimpleRect(clipSpaceIBounds);
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000672 drawState->disableStencil();
673 }
robertphillips@google.comf294b772012-04-27 14:29:26 +0000674 } else {
robertphillips@google.come79f3202014-02-11 16:30:21 +0000675 // all the remaining ops can just be directly draw into the accumulation buffer
bsalomon@google.comc6b3e482012-12-07 20:43:52 +0000676 drawState->setAlpha(0xff);
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +0000677 setup_boolean_blendcoeffs(drawState, op);
bsalomon@google.comb68addd2012-12-14 13:36:53 +0000678 this->drawElement(result, element);
robertphillips@google.comf294b772012-04-27 14:29:26 +0000679 }
680 }
681
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000682 fCurrClipMaskType = kAlpha_ClipMaskType;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000683 return result;
robertphillips@google.comf294b772012-04-27 14:29:26 +0000684}
685
686////////////////////////////////////////////////////////////////////////////////
rmistry@google.comfbfcd562012-08-23 18:09:54 +0000687// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
robertphillips@google.comf8d904a2012-07-31 12:18:16 +0000688// (as opposed to canvas) coordinates
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000689bool GrClipMaskManager::createStencilClipMask(int32_t elementsGenID,
tfarinabf54e492014-10-23 17:47:18 -0700690 GrReducedClip::InitialState initialState,
691 const GrReducedClip::ElementList& elements,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000692 const SkIRect& clipSpaceIBounds,
693 const SkIPoint& clipSpaceToStencilOffset) {
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000694
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000695 SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000696
joshualitt329bf482014-10-29 12:31:28 -0700697 GrDrawState* drawState = fClipTarget->drawState();
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000698 SkASSERT(drawState->isClipState());
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000699
700 GrRenderTarget* rt = drawState->getRenderTarget();
bsalomon49f085d2014-09-05 13:34:00 -0700701 SkASSERT(rt);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000702
703 // TODO: dynamically attach a SB when needed.
704 GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
705 if (NULL == stencilBuffer) {
706 return false;
707 }
708
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000709 if (stencilBuffer->mustRenderClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset)) {
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +0000710 stencilBuffer->setLastClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000711
bsalomon@google.com137f1342013-05-29 21:27:53 +0000712 // Set the matrix so that rendered clip elements are transformed from clip to stencil space.
713 SkVector translate = {
714 SkIntToScalar(clipSpaceToStencilOffset.fX),
715 SkIntToScalar(clipSpaceToStencilOffset.fY)
716 };
717 SkMatrix matrix;
718 matrix.setTranslate(translate);
joshualitt329bf482014-10-29 12:31:28 -0700719 GrDrawTarget::AutoGeometryAndStatePush agasp(fClipTarget, GrDrawTarget::kReset_ASRInit,
720 &matrix);
721 drawState = fClipTarget->drawState();
bsalomon@google.com137f1342013-05-29 21:27:53 +0000722
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000723 drawState->setRenderTarget(rt);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000724
bsalomon@google.com9f131742012-12-13 20:43:56 +0000725 // We set the current clip to the bounds so that our recursive draws are scissored to them.
726 SkIRect stencilSpaceIBounds(clipSpaceIBounds);
727 stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
joshualitt329bf482014-10-29 12:31:28 -0700728 GrDrawTarget::AutoClipRestore acr(fClipTarget, stencilSpaceIBounds);
bsalomon@google.com9f131742012-12-13 20:43:56 +0000729 drawState->enableState(GrDrawState::kClip_StateBit);
730
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000731#if !VISUALIZE_COMPLEX_CLIP
732 drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
733#endif
734
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000735 int clipBit = stencilBuffer->bits();
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000736 SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000737 clipBit = (1 << (clipBit-1));
738
joshualitt329bf482014-10-29 12:31:28 -0700739 fClipTarget->clearStencilClip(stencilSpaceIBounds,
740 GrReducedClip::kAllIn_InitialState == initialState,
741 rt);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000742
743 // walk through each clip element and perform its set op
744 // with the existing clip.
tfarinabf54e492014-10-23 17:47:18 -0700745 for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000746 const Element* element = iter.get();
tomhudson@google.com8afae612012-08-14 15:03:35 +0000747 bool fillInverted = false;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000748 // enabled at bottom of loop
joshualitt7a6184f2014-10-29 18:29:27 -0700749 fClipMode = kIgnoreClip_StencilClipMode;
bsalomon@google.comded4f4b2012-06-28 18:48:06 +0000750 // if the target is MSAA then we want MSAA enabled when the clip is soft
751 if (rt->isMultisampled()) {
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000752 drawState->setState(GrDrawState::kHWAntialias_StateBit, element->isAA());
bsalomon@google.comded4f4b2012-06-28 18:48:06 +0000753 }
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000754
bsalomon@google.com45a15f52012-12-10 19:10:17 +0000755 // This will be used to determine whether the clip shape can be rendered into the
756 // stencil with arbitrary stencil settings.
757 GrPathRenderer::StencilSupport stencilSupport;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000758
sugoi@google.com5f74cf82012-12-17 21:16:45 +0000759 SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
sugoi@google.com12b4e272012-12-06 20:13:11 +0000760
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000761 SkRegion::Op op = element->getOp();
robertphillips@google.comf294b772012-04-27 14:29:26 +0000762
robertphillips@google.come79f3202014-02-11 16:30:21 +0000763 GrPathRenderer* pr = NULL;
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000764 SkPath clipPath;
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000765 if (Element::kRect_Type == element->getType()) {
bsalomon@google.com45a15f52012-12-10 19:10:17 +0000766 stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000767 fillInverted = false;
tomhudson@google.com8afae612012-08-14 15:03:35 +0000768 } else {
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000769 element->asPath(&clipPath);
770 fillInverted = clipPath.isInverseFillType();
robertphillips@google.come79f3202014-02-11 16:30:21 +0000771 if (fillInverted) {
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000772 clipPath.toggleInverseFillType();
robertphillips@google.come79f3202014-02-11 16:30:21 +0000773 }
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000774 pr = this->getContext()->getPathRenderer(clipPath,
bsalomon@google.com45a15f52012-12-10 19:10:17 +0000775 stroke,
joshualitt329bf482014-10-29 12:31:28 -0700776 fClipTarget,
bsalomon@google.com45a15f52012-12-10 19:10:17 +0000777 false,
778 GrPathRendererChain::kStencilOnly_DrawType,
robertphillips@google.come79f3202014-02-11 16:30:21 +0000779 &stencilSupport);
780 if (NULL == pr) {
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000781 return false;
782 }
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000783 }
784
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000785 int passes;
786 GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
787
bsalomon@google.com45a15f52012-12-10 19:10:17 +0000788 bool canRenderDirectToStencil =
789 GrPathRenderer::kNoRestriction_StencilSupport == stencilSupport;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000790 bool canDrawDirectToClip; // Given the renderer, the element,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000791 // fill rule, and set operation can
792 // we render the element directly to
793 // stencil bit used for clipping.
794 canDrawDirectToClip = GrStencilSettings::GetClipPasses(op,
795 canRenderDirectToStencil,
796 clipBit,
797 fillInverted,
798 &passes,
799 stencilSettings);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000800
801 // draw the element to the client stencil bits if necessary
802 if (!canDrawDirectToClip) {
803 GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000804 kIncClamp_StencilOp,
805 kIncClamp_StencilOp,
806 kAlways_StencilFunc,
807 0xffff,
808 0x0000,
809 0xffff);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000810 SET_RANDOM_COLOR
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000811 if (Element::kRect_Type == element->getType()) {
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000812 *drawState->stencil() = gDrawToStencil;
joshualitt329bf482014-10-29 12:31:28 -0700813 fClipTarget->drawSimpleRect(element->getRect());
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000814 } else {
commit-bot@chromium.orge5b2af92014-02-16 13:25:24 +0000815 if (!clipPath.isEmpty()) {
commit-bot@chromium.org19dd0172013-08-05 13:28:55 +0000816 if (canRenderDirectToStencil) {
817 *drawState->stencil() = gDrawToStencil;
joshualitt329bf482014-10-29 12:31:28 -0700818 pr->drawPath(clipPath, stroke, fClipTarget, false);
commit-bot@chromium.org19dd0172013-08-05 13:28:55 +0000819 } else {
joshualitt329bf482014-10-29 12:31:28 -0700820 pr->stencilPath(clipPath, stroke, fClipTarget);
commit-bot@chromium.org19dd0172013-08-05 13:28:55 +0000821 }
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000822 }
823 }
824 }
825
826 // now we modify the clip bit by rendering either the clip
827 // element directly or a bounding rect of the entire clip.
joshualitt7a6184f2014-10-29 18:29:27 -0700828 fClipMode = kModifyClip_StencilClipMode;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000829 for (int p = 0; p < passes; ++p) {
830 *drawState->stencil() = stencilSettings[p];
831 if (canDrawDirectToClip) {
bsalomon@google.com8182fa02012-12-04 14:06:06 +0000832 if (Element::kRect_Type == element->getType()) {
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000833 SET_RANDOM_COLOR
joshualitt329bf482014-10-29 12:31:28 -0700834 fClipTarget->drawSimpleRect(element->getRect());
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000835 } else {
836 SET_RANDOM_COLOR
joshualitt329bf482014-10-29 12:31:28 -0700837 pr->drawPath(clipPath, stroke, fClipTarget, false);
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000838 }
839 } else {
840 SET_RANDOM_COLOR
bsalomon@google.com4c2443e2012-12-06 20:58:57 +0000841 // The view matrix is setup to do clip space -> stencil space translation, so
842 // draw rect in clip space.
joshualitt329bf482014-10-29 12:31:28 -0700843 fClipTarget->drawSimpleRect(SkRect::Make(clipSpaceIBounds));
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000844 }
845 }
846 }
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000847 }
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000848 // set this last because recursive draws may overwrite it back to kNone.
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000849 SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
bsalomon@google.comc8f7f472012-06-18 13:44:51 +0000850 fCurrClipMaskType = kStencil_ClipMaskType;
joshualitt7a6184f2014-10-29 18:29:27 -0700851 fClipMode = kRespectClip_StencilClipMode;
robertphillips@google.com1e945b72012-04-16 18:03:03 +0000852 return true;
853}
854
robertphillips@google.comf8d904a2012-07-31 12:18:16 +0000855
bsalomon@google.com411dad02012-06-05 20:24:20 +0000856// mapping of clip-respecting stencil funcs to normal stencil funcs
857// mapping depends on whether stencil-clipping is in effect.
rmistry@google.comfbfcd562012-08-23 18:09:54 +0000858static const GrStencilFunc
bsalomon@google.com411dad02012-06-05 20:24:20 +0000859 gSpecialToBasicStencilFunc[2][kClipStencilFuncCount] = {
860 {// Stencil-Clipping is DISABLED, we are effectively always inside the clip
861 // In the Clip Funcs
862 kAlways_StencilFunc, // kAlwaysIfInClip_StencilFunc
863 kEqual_StencilFunc, // kEqualIfInClip_StencilFunc
864 kLess_StencilFunc, // kLessIfInClip_StencilFunc
865 kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc
866 // Special in the clip func that forces user's ref to be 0.
867 kNotEqual_StencilFunc, // kNonZeroIfInClip_StencilFunc
868 // make ref 0 and do normal nequal.
869 },
870 {// Stencil-Clipping is ENABLED
871 // In the Clip Funcs
872 kEqual_StencilFunc, // kAlwaysIfInClip_StencilFunc
873 // eq stencil clip bit, mask
874 // out user bits.
875
876 kEqual_StencilFunc, // kEqualIfInClip_StencilFunc
877 // add stencil bit to mask and ref
878
879 kLess_StencilFunc, // kLessIfInClip_StencilFunc
880 kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc
881 // for both of these we can add
882 // the clip bit to the mask and
883 // ref and compare as normal
884 // Special in the clip func that forces user's ref to be 0.
885 kLess_StencilFunc, // kNonZeroIfInClip_StencilFunc
886 // make ref have only the clip bit set
887 // and make comparison be less
888 // 10..0 < 1..user_bits..
889 }
890};
891
bsalomon@google.coma3201942012-06-21 19:58:20 +0000892namespace {
893// Sets the settings to clip against the stencil buffer clip while ignoring the
894// client bits.
895const GrStencilSettings& basic_apply_stencil_clip_settings() {
896 // stencil settings to use when clip is in stencil
897 GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
898 kKeep_StencilOp,
899 kKeep_StencilOp,
900 kAlwaysIfInClip_StencilFunc,
901 0x0000,
902 0x0000,
rmistry@google.comfbfcd562012-08-23 18:09:54 +0000903 0x0000);
bsalomon@google.coma3201942012-06-21 19:58:20 +0000904 return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
905}
906}
907
joshualitta58fe352014-10-27 08:39:00 -0700908void GrClipMaskManager::setDrawStateStencil(GrDrawState::AutoRestoreStencil* ars) {
bsalomon@google.coma3201942012-06-21 19:58:20 +0000909 // We make two copies of the StencilSettings here (except in the early
910 // exit scenario. One copy from draw state to the stack var. Then another
911 // from the stack var to the gpu. We could make this class hold a ptr to
912 // GrGpu's fStencilSettings and eliminate the stack copy here.
913
joshualitt329bf482014-10-29 12:31:28 -0700914 const GrDrawState& drawState = fClipTarget->getDrawState();
bsalomon@google.coma3201942012-06-21 19:58:20 +0000915
916 // use stencil for clipping if clipping is enabled and the clip
917 // has been written into the stencil.
bsalomon@google.coma3201942012-06-21 19:58:20 +0000918
919 GrStencilSettings settings;
920 // The GrGpu client may not be using the stencil buffer but we may need to
921 // enable it in order to respect a stencil clip.
922 if (drawState.getStencil().isDisabled()) {
joshualitt7a6184f2014-10-29 18:29:27 -0700923 if (GrClipMaskManager::kRespectClip_StencilClipMode == fClipMode) {
bsalomon@google.coma3201942012-06-21 19:58:20 +0000924 settings = basic_apply_stencil_clip_settings();
925 } else {
bsalomon@google.coma3201942012-06-21 19:58:20 +0000926 return;
927 }
928 } else {
929 settings = drawState.getStencil();
930 }
931
932 // TODO: dynamically attach a stencil buffer
933 int stencilBits = 0;
joshualitta58fe352014-10-27 08:39:00 -0700934 GrStencilBuffer* stencilBuffer = drawState.getRenderTarget()->getStencilBuffer();
bsalomon49f085d2014-09-05 13:34:00 -0700935 if (stencilBuffer) {
bsalomon@google.coma3201942012-06-21 19:58:20 +0000936 stencilBits = stencilBuffer->bits();
937 }
938
joshualitt329bf482014-10-29 12:31:28 -0700939 SkASSERT(fClipTarget->caps()->stencilWrapOpsSupport() || !settings.usesWrapOp());
940 SkASSERT(fClipTarget->caps()->twoSidedStencilSupport() || !settings.isTwoSided());
joshualitt7a6184f2014-10-29 18:29:27 -0700941 this->adjustStencilParams(&settings, fClipMode, stencilBits);
joshualitt329bf482014-10-29 12:31:28 -0700942 ars->set(fClipTarget->drawState());
943 fClipTarget->drawState()->setStencil(settings);
bsalomon@google.coma3201942012-06-21 19:58:20 +0000944}
945
946void GrClipMaskManager::adjustStencilParams(GrStencilSettings* settings,
947 StencilClipMode mode,
948 int stencilBitCnt) {
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000949 SkASSERT(stencilBitCnt > 0);
bsalomon@google.com411dad02012-06-05 20:24:20 +0000950
951 if (kModifyClip_StencilClipMode == mode) {
bsalomon@google.coma3201942012-06-21 19:58:20 +0000952 // We assume that this clip manager itself is drawing to the GrGpu and
953 // has already setup the correct values.
954 return;
bsalomon@google.com411dad02012-06-05 20:24:20 +0000955 }
bsalomon@google.coma3201942012-06-21 19:58:20 +0000956
bsalomon@google.com411dad02012-06-05 20:24:20 +0000957 unsigned int clipBit = (1 << (stencilBitCnt - 1));
958 unsigned int userBits = clipBit - 1;
959
bsalomon@google.coma3201942012-06-21 19:58:20 +0000960 GrStencilSettings::Face face = GrStencilSettings::kFront_Face;
joshualitt329bf482014-10-29 12:31:28 -0700961 bool twoSided = fClipTarget->caps()->twoSidedStencilSupport();
bsalomon@google.com411dad02012-06-05 20:24:20 +0000962
bsalomon@google.coma3201942012-06-21 19:58:20 +0000963 bool finished = false;
964 while (!finished) {
965 GrStencilFunc func = settings->func(face);
966 uint16_t writeMask = settings->writeMask(face);
967 uint16_t funcMask = settings->funcMask(face);
968 uint16_t funcRef = settings->funcRef(face);
969
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000970 SkASSERT((unsigned) func < kStencilFuncCount);
bsalomon@google.coma3201942012-06-21 19:58:20 +0000971
972 writeMask &= userBits;
973
974 if (func >= kBasicStencilFuncCount) {
975 int respectClip = kRespectClip_StencilClipMode == mode;
976 if (respectClip) {
977 // The GrGpu class should have checked this
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000978 SkASSERT(this->isClipInStencil());
bsalomon@google.coma3201942012-06-21 19:58:20 +0000979 switch (func) {
980 case kAlwaysIfInClip_StencilFunc:
981 funcMask = clipBit;
982 funcRef = clipBit;
983 break;
984 case kEqualIfInClip_StencilFunc:
985 case kLessIfInClip_StencilFunc:
986 case kLEqualIfInClip_StencilFunc:
987 funcMask = (funcMask & userBits) | clipBit;
988 funcRef = (funcRef & userBits) | clipBit;
989 break;
990 case kNonZeroIfInClip_StencilFunc:
991 funcMask = (funcMask & userBits) | clipBit;
992 funcRef = clipBit;
993 break;
994 default:
commit-bot@chromium.org88cb22b2014-04-30 14:17:00 +0000995 SkFAIL("Unknown stencil func");
bsalomon@google.coma3201942012-06-21 19:58:20 +0000996 }
997 } else {
998 funcMask &= userBits;
999 funcRef &= userBits;
bsalomon@google.com411dad02012-06-05 20:24:20 +00001000 }
rmistry@google.comfbfcd562012-08-23 18:09:54 +00001001 const GrStencilFunc* table =
bsalomon@google.coma3201942012-06-21 19:58:20 +00001002 gSpecialToBasicStencilFunc[respectClip];
1003 func = table[func - kBasicStencilFuncCount];
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +00001004 SkASSERT(func >= 0 && func < kBasicStencilFuncCount);
bsalomon@google.com411dad02012-06-05 20:24:20 +00001005 } else {
bsalomon@google.coma3201942012-06-21 19:58:20 +00001006 funcMask &= userBits;
1007 funcRef &= userBits;
bsalomon@google.com411dad02012-06-05 20:24:20 +00001008 }
bsalomon@google.coma3201942012-06-21 19:58:20 +00001009
1010 settings->setFunc(face, func);
1011 settings->setWriteMask(face, writeMask);
1012 settings->setFuncMask(face, funcMask);
1013 settings->setFuncRef(face, funcRef);
1014
1015 if (GrStencilSettings::kFront_Face == face) {
1016 face = GrStencilSettings::kBack_Face;
1017 finished = !twoSided;
1018 } else {
1019 finished = true;
1020 }
bsalomon@google.com411dad02012-06-05 20:24:20 +00001021 }
bsalomon@google.coma3201942012-06-21 19:58:20 +00001022 if (!twoSided) {
1023 settings->copyFrontSettingsToBack();
1024 }
bsalomon@google.com411dad02012-06-05 20:24:20 +00001025}
1026
1027////////////////////////////////////////////////////////////////////////////////
commit-bot@chromium.orgd3e58422013-11-05 15:03:08 +00001028GrTexture* GrClipMaskManager::createSoftwareClipMask(int32_t elementsGenID,
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001029 GrReducedClip::InitialState initialState,
1030 const GrReducedClip::ElementList& elements,
1031 const SkIRect& clipSpaceIBounds) {
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +00001032 SkASSERT(kNone_ClipMaskType == fCurrClipMaskType);
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001033
krajcevskiad1dc582014-06-10 15:06:47 -07001034 GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds);
bsalomon49f085d2014-09-05 13:34:00 -07001035 if (result) {
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001036 return result;
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001037 }
1038
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001039 // The mask texture may be larger than necessary. We round out the clip space bounds and pin
1040 // the top left corner of the resulting rect to the top left of the texture.
1041 SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());
1042
robertphillips@google.com2c756812012-05-22 20:28:23 +00001043 GrSWMaskHelper helper(this->getContext());
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001044
bsalomon@google.comb9086a02012-11-01 18:02:54 +00001045 SkMatrix matrix;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001046 matrix.setTranslate(SkIntToScalar(-clipSpaceIBounds.fLeft),
1047 SkIntToScalar(-clipSpaceIBounds.fTop));
krajcevski71614ac2014-08-13 10:36:18 -07001048 helper.init(maskSpaceIBounds, &matrix, false);
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001049
tfarinabf54e492014-10-23 17:47:18 -07001050 helper.clear(GrReducedClip::kAllIn_InitialState == initialState ? 0xFF : 0x00);
robertphillips@google.comfa662942012-05-17 12:20:22 +00001051
sugoi@google.com5f74cf82012-12-17 21:16:45 +00001052 SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
sugoi@google.com12b4e272012-12-06 20:13:11 +00001053
tfarinabf54e492014-10-23 17:47:18 -07001054 for (GrReducedClip::ElementList::Iter iter(elements.headIter()) ; iter.get(); iter.next()) {
robertphillips@google.coma6f11c42012-07-23 17:39:44 +00001055
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001056 const Element* element = iter.get();
bsalomon@google.com8182fa02012-12-04 14:06:06 +00001057 SkRegion::Op op = element->getOp();
robertphillips@google.comfa662942012-05-17 12:20:22 +00001058
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001059 if (SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
1060 // Intersect and reverse difference require modifying pixels outside of the geometry
1061 // that is being "drawn". In both cases we erase all the pixels outside of the geometry
1062 // but leave the pixels inside the geometry alone. For reverse difference we invert all
1063 // the pixels before clearing the ones outside the geometry.
robertphillips@google.comfa662942012-05-17 12:20:22 +00001064 if (SkRegion::kReverseDifference_Op == op) {
reed@google.com44699382013-10-31 17:28:30 +00001065 SkRect temp = SkRect::Make(clipSpaceIBounds);
robertphillips@google.comfa662942012-05-17 12:20:22 +00001066 // invert the entire scene
robertphillips@google.com366f1c62012-06-29 21:38:47 +00001067 helper.draw(temp, SkRegion::kXOR_Op, false, 0xFF);
robertphillips@google.comfa662942012-05-17 12:20:22 +00001068 }
1069
commit-bot@chromium.org5c056392014-02-17 19:50:02 +00001070 SkPath clipPath;
1071 element->asPath(&clipPath);
1072 clipPath.toggleInverseFillType();
1073 helper.draw(clipPath, stroke, SkRegion::kReplace_Op, element->isAA(), 0x00);
robertphillips@google.comfa662942012-05-17 12:20:22 +00001074
1075 continue;
1076 }
1077
1078 // The other ops (union, xor, diff) only affect pixels inside
1079 // the geometry so they can just be drawn normally
bsalomon@google.com8182fa02012-12-04 14:06:06 +00001080 if (Element::kRect_Type == element->getType()) {
1081 helper.draw(element->getRect(), op, element->isAA(), 0xFF);
1082 } else {
commit-bot@chromium.org5c056392014-02-17 19:50:02 +00001083 SkPath path;
1084 element->asPath(&path);
1085 helper.draw(path, stroke, op, element->isAA(), 0xFF);
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001086 }
1087 }
1088
krajcevskiad1dc582014-06-10 15:06:47 -07001089 // Allocate clip mask texture
1090 result = this->allocMaskTexture(elementsGenID, clipSpaceIBounds, true);
1091 if (NULL == result) {
1092 fAACache.reset();
1093 return NULL;
1094 }
robertphillips@google.comd92cf2e2013-07-19 18:13:02 +00001095 helper.toTexture(result);
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001096
bsalomon@google.comc8f7f472012-06-18 13:44:51 +00001097 fCurrClipMaskType = kAlpha_ClipMaskType;
bsalomon@google.com4c2443e2012-12-06 20:58:57 +00001098 return result;
robertphillips@google.com6b70a7b2012-05-11 15:32:48 +00001099}
1100
robertphillips@google.comf294b772012-04-27 14:29:26 +00001101////////////////////////////////////////////////////////////////////////////////
bsalomonc8dc1f72014-08-21 13:02:13 -07001102void GrClipMaskManager::purgeResources() {
1103 fAACache.purgeResources();
robertphillips@google.com1e945b72012-04-16 18:03:03 +00001104}
bsalomon@google.com6e4e6502013-02-25 20:12:45 +00001105
joshualitt329bf482014-10-29 12:31:28 -07001106void GrClipMaskManager::setClipTarget(GrClipTarget* clipTarget) {
1107 fClipTarget = clipTarget;
1108 fAACache.setContext(clipTarget->getContext());
bsalomon@google.com6e4e6502013-02-25 20:12:45 +00001109}
commit-bot@chromium.orgc4dc0ad2013-10-09 14:11:33 +00001110
1111void GrClipMaskManager::adjustPathStencilParams(GrStencilSettings* settings) {
joshualitt329bf482014-10-29 12:31:28 -07001112 const GrDrawState& drawState = fClipTarget->getDrawState();
commit-bot@chromium.orgc4dc0ad2013-10-09 14:11:33 +00001113
1114 // TODO: dynamically attach a stencil buffer
1115 int stencilBits = 0;
joshualitt329bf482014-10-29 12:31:28 -07001116 GrStencilBuffer* stencilBuffer = drawState.getRenderTarget()->getStencilBuffer();
bsalomon49f085d2014-09-05 13:34:00 -07001117 if (stencilBuffer) {
commit-bot@chromium.orgc4dc0ad2013-10-09 14:11:33 +00001118 stencilBits = stencilBuffer->bits();
joshualitt7a6184f2014-10-29 18:29:27 -07001119 this->adjustStencilParams(settings, fClipMode, stencilBits);
commit-bot@chromium.orgc4dc0ad2013-10-09 14:11:33 +00001120 }
1121}