1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HWUI_SNAPSHOT_H 18 #define ANDROID_HWUI_SNAPSHOT_H 19 20 #include <GLES2/gl2.h> 21 #include <GLES2/gl2ext.h> 22 23 #include <utils/RefBase.h> 24 #include <ui/Region.h> 25 26 #include <SkRegion.h> 27 28 #include "Layer.h" 29 #include "Matrix.h" 30 #include "Rect.h" 31 32 namespace android { 33 namespace uirenderer { 34 35 /** 36 * A snapshot holds information about the current state of the rendering 37 * surface. A snapshot is usually created whenever the user calls save() 38 * and discarded when the user calls restore(). Once a snapshot is created, 39 * it can hold information for deferred rendering. 40 * 41 * Each snapshot has a link to a previous snapshot, indicating the previous 42 * state of the renderer. 43 */ 44 class Snapshot: public LightRefBase<Snapshot> { 45 public: 46 47 Snapshot(); 48 Snapshot(const sp<Snapshot>& s, int saveFlags); 49 50 /** 51 * Various flags set on ::flags. 52 */ 53 enum Flags { 54 /** 55 * Indicates that the clip region was modified. When this 56 * snapshot is restored so must the clip. 57 */ 58 kFlagClipSet = 0x1, 59 /** 60 * Indicates that this snapshot was created when saving 61 * a new layer. 62 */ 63 kFlagIsLayer = 0x2, 64 /** 65 * Indicates that this snapshot is a special type of layer 66 * backed by an FBO. This flag only makes sense when the 67 * flag kFlagIsLayer is also set. 68 */ 69 kFlagIsFboLayer = 0x4, 70 /** 71 * Indicates that this snapshot has changed the ortho matrix. 72 */ 73 kFlagDirtyOrtho = 0x8, 74 /** 75 * Indicates that this snapshot or an ancestor snapshot is 76 * an FBO layer. 77 */ 78 kFlagFboTarget = 0x10 79 }; 80 81 /** 82 * Modifies the current clip with the new clip rectangle and 83 * the specified operation. The specified rectangle is transformed 84 * by this snapshot's trasnformation. 85 */ 86 bool clip(float left, float top, float right, float bottom, 87 SkRegion::Op op = SkRegion::kIntersect_Op); 88 89 /** 90 * Modifies the current clip with the new clip rectangle and 91 * the specified operation. The specified rectangle is considered 92 * already transformed. 93 */ 94 bool clipTransformed(const Rect& r, SkRegion::Op op = SkRegion::kIntersect_Op); 95 96 /** 97 * Sets the current clip. 98 */ 99 void setClip(float left, float top, float right, float bottom); 100 101 /** 102 * Returns the current clip in local coordinates. The clip rect is 103 * transformed by the inverse transform matrix. 104 */ 105 const Rect& getLocalClip(); 106 107 /** 108 * Resets the clip to the specified rect. 109 */ 110 void resetClip(float left, float top, float right, float bottom); 111 112 /** 113 * Resets the current transform to a pure 3D translation. 114 */ 115 void resetTransform(float x, float y, float z); 116 117 /** 118 * Indicates whether this snapshot should be ignored. A snapshot 119 * is typicalled ignored if its layer is invisible or empty. 120 */ 121 bool isIgnored() const; 122 123 /** 124 * Indicates whether the current transform has perspective components. 125 */ 126 bool hasPerspectiveTransform() const; 127 128 /** 129 * Dirty flags. 130 */ 131 int flags; 132 133 /** 134 * Previous snapshot. 135 */ 136 sp<Snapshot> previous; 137 138 /** 139 * Only set when the flag kFlagIsLayer is set. 140 * 141 * This snapshot does not own the layer, this pointer must not be freed. 142 */ 143 Layer* layer; 144 145 /** 146 * Target FBO used for rendering. Set to 0 when rendering directly 147 * into the framebuffer. 148 */ 149 GLuint fbo; 150 151 /** 152 * Indicates that this snapshot is invisible and nothing should be drawn 153 * inside it. This flag is set only when the layer clips drawing to its 154 * bounds and is passed to subsequent snapshots. 155 */ 156 bool invisible; 157 158 /** 159 * If set to true, the layer will not be composited. This is similar to 160 * invisible but this flag is not passed to subsequent snapshots. 161 */ 162 bool empty; 163 164 /** 165 * Current viewport. 166 */ 167 Rect viewport; 168 169 /** 170 * Height of the framebuffer the snapshot is rendering into. 171 */ 172 int height; 173 174 /** 175 * Contains the previous ortho matrix. 176 */ 177 mat4 orthoMatrix; 178 179 /** 180 * Local transformation. Holds the current translation, scale and 181 * rotation values. 182 * 183 * This is a reference to a matrix owned by this snapshot or another 184 * snapshot. This pointer must not be freed. See ::mTransformRoot. 185 */ 186 mat4* transform; 187 188 /** 189 * Current clip rect. The clip is stored in canvas-space coordinates, 190 * (screen-space coordinates in the regular case.) 191 * 192 * This is a reference to a rect owned by this snapshot or another 193 * snapshot. This pointer must not be freed. See ::mClipRectRoot. 194 */ 195 Rect* clipRect; 196 197 /** 198 * Current clip region. The clip is stored in canvas-space coordinates, 199 * (screen-space coordinates in the regular case.) 200 * 201 * This is a reference to a region owned by this snapshot or another 202 * snapshot. This pointer must not be freed. See ::mClipRegionRoot. 203 * 204 * This field is used only if STENCIL_BUFFER_SIZE is > 0. 205 */ 206 SkRegion* clipRegion; 207 208 /** 209 * The ancestor layer's dirty region. 210 * 211 * This is a reference to a region owned by a layer. This pointer must 212 * not be freed. 213 */ 214 Region* region; 215 216 /** 217 * Current alpha value. This value is 1 by default, but may be set by a DisplayList which 218 * has translucent rendering in a non-overlapping View. This value will be used by 219 * the renderer to set the alpha in the current color being used for ensuing drawing 220 * operations. The value is inherited by child snapshots because the same value should 221 * be applied to descendents of the current DisplayList (for example, a TextView contains 222 * the base alpha value which should be applied to the child DisplayLists used for drawing 223 * the actual text). 224 */ 225 float alpha; 226 227 private: 228 void ensureClipRegion(); 229 void copyClipRectFromRegion(); 230 231 bool clipRegionOp(float left, float top, float right, float bottom, SkRegion::Op op); 232 233 mat4 mTransformRoot; 234 Rect mClipRectRoot; 235 Rect mLocalClip; 236 237 #if STENCIL_BUFFER_SIZE 238 SkRegion mClipRegionRoot; 239 #endif 240 241 }; // class Snapshot 242 243 }; // namespace uirenderer 244 }; // namespace android 245 246 #endif // ANDROID_HWUI_SNAPSHOT_H 247
