| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Snapshot.h" |
| |
| #include <SkCanvas.h> |
| |
| namespace android { |
| namespace uirenderer { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Constructors |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| Snapshot::Snapshot(): flags(0), previous(NULL), layer(NULL), fbo(0), |
| invisible(false), empty(false) { |
| |
| transform = &mTransformRoot; |
| clipRect = &mClipRectRoot; |
| region = NULL; |
| } |
| |
| /** |
| * Copies the specified snapshot/ The specified snapshot is stored as |
| * the previous snapshot. |
| */ |
| Snapshot::Snapshot(const sp<Snapshot>& s, int saveFlags): |
| flags(0), previous(s), layer(NULL), fbo(s->fbo), |
| invisible(s->invisible), empty(false), |
| viewport(s->viewport), height(s->height) { |
| |
| if (saveFlags & SkCanvas::kMatrix_SaveFlag) { |
| mTransformRoot.load(*s->transform); |
| transform = &mTransformRoot; |
| } else { |
| transform = s->transform; |
| } |
| |
| if (saveFlags & SkCanvas::kClip_SaveFlag) { |
| mClipRectRoot.set(*s->clipRect); |
| clipRect = &mClipRectRoot; |
| } else { |
| clipRect = s->clipRect; |
| } |
| |
| if (s->flags & Snapshot::kFlagFboTarget) { |
| flags |= Snapshot::kFlagFboTarget; |
| region = s->region; |
| } else { |
| region = NULL; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Clipping |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool Snapshot::clip(float left, float top, float right, float bottom, SkRegion::Op op) { |
| Rect r(left, top, right, bottom); |
| transform->mapRect(r); |
| return clipTransformed(r, op); |
| } |
| |
| bool Snapshot::clipTransformed(const Rect& r, SkRegion::Op op) { |
| bool clipped = false; |
| |
| // NOTE: The unimplemented operations require support for regions |
| // Supporting regions would require using a stencil buffer instead |
| // of the scissor. The stencil buffer itself is not too expensive |
| // (memory cost excluded) but on fillrate limited devices, managing |
| // the stencil might have a negative impact on the framerate. |
| switch (op) { |
| case SkRegion::kDifference_Op: |
| break; |
| case SkRegion::kIntersect_Op: |
| clipped = clipRect->intersect(r); |
| if (!clipped) { |
| clipRect->setEmpty(); |
| clipped = true; |
| } |
| break; |
| case SkRegion::kUnion_Op: |
| clipped = clipRect->unionWith(r); |
| break; |
| case SkRegion::kXOR_Op: |
| break; |
| case SkRegion::kReverseDifference_Op: |
| break; |
| case SkRegion::kReplace_Op: |
| clipRect->set(r); |
| clipped = true; |
| break; |
| } |
| |
| if (clipped) { |
| flags |= Snapshot::kFlagClipSet; |
| } |
| |
| return clipped; |
| } |
| |
| void Snapshot::setClip(float left, float top, float right, float bottom) { |
| clipRect->set(left, top, right, bottom); |
| flags |= Snapshot::kFlagClipSet; |
| } |
| |
| const Rect& Snapshot::getLocalClip() { |
| mat4 inverse; |
| inverse.loadInverse(*transform); |
| |
| mLocalClip.set(*clipRect); |
| inverse.mapRect(mLocalClip); |
| |
| return mLocalClip; |
| } |
| |
| void Snapshot::resetClip(float left, float top, float right, float bottom) { |
| clipRect = &mClipRectRoot; |
| clipRect->set(left, top, right, bottom); |
| flags |= Snapshot::kFlagClipSet; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Transforms |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void Snapshot::resetTransform(float x, float y, float z) { |
| transform = &mTransformRoot; |
| transform->loadTranslate(x, y, z); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Queries |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool Snapshot::isIgnored() const { |
| return invisible || empty; |
| } |
| |
| }; // namespace uirenderer |
| }; // namespace android |