| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #ifndef ANDROID_UI_SNAPSHOT_H |
| #define ANDROID_UI_SNAPSHOT_H |
| |
| #include <GLES2/gl2.h> |
| #include <GLES2/gl2ext.h> |
| |
| #include <utils/RefBase.h> |
| |
| #include <SkRegion.h> |
| |
| #include "Layer.h" |
| #include "Matrix.h" |
| #include "Rect.h" |
| |
| namespace android { |
| namespace uirenderer { |
| |
| /** |
| * A snapshot holds information about the current state of the rendering |
| * surface. A snapshot is usually created whenever the user calls save() |
| * and discarded when the user calls restore(). Once a snapshot is created, |
| * it can hold information for deferred rendering. |
| * |
| * Each snapshot has a link to a previous snapshot, indicating the previous |
| * state of the renderer. |
| */ |
| class Snapshot: public LightRefBase<Snapshot> { |
| public: |
| Snapshot(): flags(0), previous(NULL), layer(NULL), fbo(0) { } |
| |
| /** |
| * Copies the specified snapshot. Only the transform and clip rectangle |
| * are copied. The layer information is set to 0 and the transform is |
| * assumed to be dirty. The specified snapshot is stored as the previous |
| * snapshot. |
| */ |
| Snapshot(const sp<Snapshot>& s): |
| height(s->height), |
| transform(s->transform), |
| clipRect(s->clipRect), |
| flags(0), |
| previous(s), |
| layer(NULL), |
| fbo(s->fbo), |
| viewport(s->viewport) { |
| if ((s->flags & Snapshot::kFlagClipSet) && |
| !(s->flags & Snapshot::kFlagDirtyLocalClip)) { |
| localClip.set(s->localClip); |
| } else { |
| flags |= Snapshot::kFlagDirtyLocalClip; |
| } |
| } |
| |
| /** |
| * Various flags set on #flags. |
| */ |
| enum Flags { |
| /** |
| * Indicates that the clip region was modified. When this |
| * snapshot is restored so must the clip. |
| */ |
| kFlagClipSet = 0x1, |
| /** |
| * Indicates that this snapshot was created when saving |
| * a new layer. |
| */ |
| kFlagIsLayer = 0x2, |
| /** |
| * Indicates that this snapshot has changed the ortho matrix. |
| */ |
| kFlagDirtyOrtho = 0x4, |
| /** |
| * Indicates that the local clip should be recomputed. |
| */ |
| kFlagDirtyLocalClip = 0x8, |
| }; |
| |
| /** |
| * Intersects the current clip with the new clip rectangle. |
| */ |
| bool clip(float left, float top, float right, float bottom, SkRegion::Op op) { |
| bool clipped = false; |
| |
| Rect r(left, top, right, bottom); |
| transform.mapRect(r); |
| |
| switch (op) { |
| case SkRegion::kDifference_Op: |
| break; |
| case SkRegion::kIntersect_Op: |
| clipped = clipRect.intersect(r); |
| 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 | Snapshot::kFlagDirtyLocalClip; |
| } |
| |
| return clipped; |
| } |
| |
| /** |
| * Sets the current clip. |
| */ |
| void setClip(float left, float top, float right, float bottom) { |
| clipRect.set(left, top, right, bottom); |
| flags |= Snapshot::kFlagClipSet | Snapshot::kFlagDirtyLocalClip; |
| } |
| |
| const Rect& getLocalClip() { |
| if (flags & Snapshot::kFlagDirtyLocalClip) { |
| mat4 inverse; |
| inverse.loadInverse(transform); |
| |
| localClip.set(clipRect); |
| inverse.mapRect(localClip); |
| |
| flags &= ~Snapshot::kFlagDirtyLocalClip; |
| } |
| return localClip; |
| } |
| |
| /** |
| * Height of the framebuffer the snapshot is rendering into. |
| */ |
| int height; |
| |
| /** |
| * Local transformation. Holds the current translation, scale and |
| * rotation values. |
| */ |
| mat4 transform; |
| |
| /** |
| * Current clip region. The clip is stored in canvas-space coordinates, |
| * (screen-space coordinates in the regular case.) |
| */ |
| Rect clipRect; |
| |
| /** |
| * Dirty flags. |
| */ |
| int flags; |
| |
| /** |
| * Previous snapshot. |
| */ |
| sp<Snapshot> previous; |
| |
| /** |
| * Only set when the flag kFlagIsLayer is set. |
| */ |
| Layer* layer; |
| GLuint fbo; |
| |
| /** |
| * Current viewport. |
| */ |
| Rect viewport; |
| |
| /** |
| * Contains the previous ortho matrix. |
| */ |
| mat4 orthoMatrix; |
| |
| private: |
| Rect localClip; |
| |
| }; // class Snapshot |
| |
| }; // namespace uirenderer |
| }; // namespace android |
| |
| #endif // ANDROID_UI_SNAPSHOT_H |