OpenGLRenderer.h revision e63f7c622a2086aefa80983c6f41b74fb166bb42
15baf6324a97430016026419deaef246ad75430fcStephen Hines/*
25baf6324a97430016026419deaef246ad75430fcStephen Hines * Copyright (C) 2010 The Android Open Source Project
35baf6324a97430016026419deaef246ad75430fcStephen Hines *
45baf6324a97430016026419deaef246ad75430fcStephen Hines * Licensed under the Apache License, Version 2.0 (the "License");
55baf6324a97430016026419deaef246ad75430fcStephen Hines * you may not use this file except in compliance with the License.
65baf6324a97430016026419deaef246ad75430fcStephen Hines * You may obtain a copy of the License at
75baf6324a97430016026419deaef246ad75430fcStephen Hines *
85baf6324a97430016026419deaef246ad75430fcStephen Hines *      http://www.apache.org/licenses/LICENSE-2.0
95baf6324a97430016026419deaef246ad75430fcStephen Hines *
105baf6324a97430016026419deaef246ad75430fcStephen Hines * Unless required by applicable law or agreed to in writing, software
115baf6324a97430016026419deaef246ad75430fcStephen Hines * distributed under the License is distributed on an "AS IS" BASIS,
125baf6324a97430016026419deaef246ad75430fcStephen Hines * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
135baf6324a97430016026419deaef246ad75430fcStephen Hines * See the License for the specific language governing permissions and
145baf6324a97430016026419deaef246ad75430fcStephen Hines * limitations under the License.
155baf6324a97430016026419deaef246ad75430fcStephen Hines */
165baf6324a97430016026419deaef246ad75430fcStephen Hines
17593a894650e81be54173106ec266f0311cebebd3Stephen Hines#ifndef ANDROID_HWUI_OPENGL_RENDERER_H
18593a894650e81be54173106ec266f0311cebebd3Stephen Hines#define ANDROID_HWUI_OPENGL_RENDERER_H
195baf6324a97430016026419deaef246ad75430fcStephen Hines
205baf6324a97430016026419deaef246ad75430fcStephen Hines#include <GLES2/gl2.h>
215baf6324a97430016026419deaef246ad75430fcStephen Hines#include <GLES2/gl2ext.h>
225baf6324a97430016026419deaef246ad75430fcStephen Hines
235baf6324a97430016026419deaef246ad75430fcStephen Hines#include <SkBitmap.h>
245baf6324a97430016026419deaef246ad75430fcStephen Hines#include <SkMatrix.h>
255baf6324a97430016026419deaef246ad75430fcStephen Hines#include <SkPaint.h>
265baf6324a97430016026419deaef246ad75430fcStephen Hines#include <SkRegion.h>
27593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include <SkShader.h>
28593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include <SkXfermode.h>
295baf6324a97430016026419deaef246ad75430fcStephen Hines
305baf6324a97430016026419deaef246ad75430fcStephen Hines#include <utils/Functor.h>
315baf6324a97430016026419deaef246ad75430fcStephen Hines#include <utils/RefBase.h>
325baf6324a97430016026419deaef246ad75430fcStephen Hines#include <utils/SortedVector.h>
335baf6324a97430016026419deaef246ad75430fcStephen Hines#include <utils/Vector.h>
345baf6324a97430016026419deaef246ad75430fcStephen Hines
355baf6324a97430016026419deaef246ad75430fcStephen Hines#include <cutils/compiler.h>
36593a894650e81be54173106ec266f0311cebebd3Stephen Hines
37593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include <androidfw/ResourceTypes.h>
38593a894650e81be54173106ec266f0311cebebd3Stephen Hines
395baf6324a97430016026419deaef246ad75430fcStephen Hines#include "Debug.h"
405baf6324a97430016026419deaef246ad75430fcStephen Hines#include "Extensions.h"
41593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "Matrix.h"
42593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "Program.h"
435baf6324a97430016026419deaef246ad75430fcStephen Hines#include "Rect.h"
44593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "Snapshot.h"
455baf6324a97430016026419deaef246ad75430fcStephen Hines#include "Vertex.h"
46593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "SkiaShader.h"
47593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "SkiaColorFilter.h"
48593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "UvMapper.h"
49593a894650e81be54173106ec266f0311cebebd3Stephen Hines#include "Caches.h"
505baf6324a97430016026419deaef246ad75430fcStephen Hines
515baf6324a97430016026419deaef246ad75430fcStephen Hinesnamespace android {
525baf6324a97430016026419deaef246ad75430fcStephen Hinesnamespace uirenderer {
535baf6324a97430016026419deaef246ad75430fcStephen Hines
54593a894650e81be54173106ec266f0311cebebd3Stephen Hinesstruct DrawModifiers {
55593a894650e81be54173106ec266f0311cebebd3Stephen Hines    DrawModifiers() {
56593a894650e81be54173106ec266f0311cebebd3Stephen Hines        reset();
57593a894650e81be54173106ec266f0311cebebd3Stephen Hines    }
58593a894650e81be54173106ec266f0311cebebd3Stephen Hines
59593a894650e81be54173106ec266f0311cebebd3Stephen Hines    void reset() {
60593a894650e81be54173106ec266f0311cebebd3Stephen Hines        memset(this, 0, sizeof(DrawModifiers));
61593a894650e81be54173106ec266f0311cebebd3Stephen Hines    }
62593a894650e81be54173106ec266f0311cebebd3Stephen Hines
63593a894650e81be54173106ec266f0311cebebd3Stephen Hines    SkiaShader* mShader;
64593a894650e81be54173106ec266f0311cebebd3Stephen Hines    SkiaColorFilter* mColorFilter;
65593a894650e81be54173106ec266f0311cebebd3Stephen Hines    float mOverrideLayerAlpha;
66593a894650e81be54173106ec266f0311cebebd3Stephen Hines
67593a894650e81be54173106ec266f0311cebebd3Stephen Hines    // Drop shadow
68593a894650e81be54173106ec266f0311cebebd3Stephen Hines    bool mHasShadow;
695baf6324a97430016026419deaef246ad75430fcStephen Hines    float mShadowRadius;
70593a894650e81be54173106ec266f0311cebebd3Stephen Hines    float mShadowDx;
71593a894650e81be54173106ec266f0311cebebd3Stephen Hines    float mShadowDy;
72593a894650e81be54173106ec266f0311cebebd3Stephen Hines    int mShadowColor;
73593a894650e81be54173106ec266f0311cebebd3Stephen Hines
74593a894650e81be54173106ec266f0311cebebd3Stephen Hines    // Draw filters
75593a894650e81be54173106ec266f0311cebebd3Stephen Hines    bool mHasDrawFilter;
76593a894650e81be54173106ec266f0311cebebd3Stephen Hines    int mPaintFilterClearBits;
77593a894650e81be54173106ec266f0311cebebd3Stephen Hines    int mPaintFilterSetBits;
78593a894650e81be54173106ec266f0311cebebd3Stephen Hines};
795baf6324a97430016026419deaef246ad75430fcStephen Hines
805baf6324a97430016026419deaef246ad75430fcStephen Hinesenum StateDeferFlags {
815baf6324a97430016026419deaef246ad75430fcStephen Hines    kStateDeferFlag_Draw = 0x1,
825baf6324a97430016026419deaef246ad75430fcStephen Hines    kStateDeferFlag_Clip = 0x2
835baf6324a97430016026419deaef246ad75430fcStephen Hines};
845baf6324a97430016026419deaef246ad75430fcStephen Hines
855baf6324a97430016026419deaef246ad75430fcStephen Hinesenum DrawOpMode {
865baf6324a97430016026419deaef246ad75430fcStephen Hines    kDrawOpMode_Immediate,
875baf6324a97430016026419deaef246ad75430fcStephen Hines    kDrawOpMode_Defer,
885baf6324a97430016026419deaef246ad75430fcStephen Hines    kDrawOpMode_Flush
895baf6324a97430016026419deaef246ad75430fcStephen Hines};
905baf6324a97430016026419deaef246ad75430fcStephen Hines
915baf6324a97430016026419deaef246ad75430fcStephen Hinesenum ClipSideFlags {
925baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_None = 0x0,
935baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_Left = 0x1,
945baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_Top = 0x2,
955baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_Right = 0x4,
965baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_Bottom = 0x8,
975baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_Full = 0xF,
985baf6324a97430016026419deaef246ad75430fcStephen Hines    kClipSide_ConservativeFull = 0x1F
99593a894650e81be54173106ec266f0311cebebd3Stephen Hines};
100593a894650e81be54173106ec266f0311cebebd3Stephen Hines
1015baf6324a97430016026419deaef246ad75430fcStephen Hines///////////////////////////////////////////////////////////////////////////////
1025baf6324a97430016026419deaef246ad75430fcStephen Hines// Renderer
1035baf6324a97430016026419deaef246ad75430fcStephen Hines///////////////////////////////////////////////////////////////////////////////
1045baf6324a97430016026419deaef246ad75430fcStephen Hines
1055baf6324a97430016026419deaef246ad75430fcStephen Hinesclass DeferredDisplayState;
1065baf6324a97430016026419deaef246ad75430fcStephen Hinesclass DisplayList;
107593a894650e81be54173106ec266f0311cebebd3Stephen Hinesclass TextSetupFunctor;
1085baf6324a97430016026419deaef246ad75430fcStephen Hinesclass VertexBuffer;
1095baf6324a97430016026419deaef246ad75430fcStephen Hines
1105baf6324a97430016026419deaef246ad75430fcStephen Hines/**
111593a894650e81be54173106ec266f0311cebebd3Stephen Hines * OpenGL renderer used to draw accelerated 2D graphics. The API is a
112 * simplified version of Skia's Canvas API.
113 */
114class OpenGLRenderer {
115public:
116    ANDROID_API OpenGLRenderer();
117    virtual ~OpenGLRenderer();
118
119    /**
120     * Sets the name of this renderer. The name is optional and
121     * empty by default. If the pointer is null the name is set
122     * to the empty string.
123     */
124    ANDROID_API void setName(const char* name);
125
126    /**
127     * Returns the name of this renderer as UTF8 string.
128     * The returned pointer is never null.
129     */
130    ANDROID_API const char* getName() const;
131
132    /**
133     * Read externally defined properties to control the behavior
134     * of the renderer.
135     */
136    ANDROID_API void initProperties();
137
138    /**
139     * Indicates whether this renderer executes drawing commands immediately.
140     * If this method returns true, the drawing commands will be executed
141     * later.
142     */
143    virtual bool isDeferred();
144
145    /**
146     * Sets the dimension of the underlying drawing surface. This method must
147     * be called at least once every time the drawing surface changes size.
148     *
149     * @param width The width in pixels of the underlysing surface
150     * @param height The height in pixels of the underlysing surface
151     */
152    virtual void setViewport(int width, int height);
153
154    /**
155     * Prepares the renderer to draw a frame. This method must be invoked
156     * at the beginning of each frame. When this method is invoked, the
157     * entire drawing surface is assumed to be redrawn.
158     *
159     * @param opaque If true, the target surface is considered opaque
160     *               and will not be cleared. If false, the target surface
161     *               will be cleared
162     */
163    ANDROID_API status_t prepare(bool opaque);
164
165    /**
166     * Prepares the renderer to draw a frame. This method must be invoked
167     * at the beginning of each frame. Only the specified rectangle of the
168     * frame is assumed to be dirty. A clip will automatically be set to
169     * the specified rectangle.
170     *
171     * @param left The left coordinate of the dirty rectangle
172     * @param top The top coordinate of the dirty rectangle
173     * @param right The right coordinate of the dirty rectangle
174     * @param bottom The bottom coordinate of the dirty rectangle
175     * @param opaque If true, the target surface is considered opaque
176     *               and will not be cleared. If false, the target surface
177     *               will be cleared in the specified dirty rectangle
178     */
179    virtual status_t prepareDirty(float left, float top, float right, float bottom, bool opaque);
180
181    /**
182     * Indicates the end of a frame. This method must be invoked whenever
183     * the caller is done rendering a frame.
184     */
185    virtual void finish();
186
187    /**
188     * This method must be invoked before handing control over to a draw functor.
189     * See callDrawGLFunction() for instance.
190     *
191     * This command must not be recorded inside display lists.
192     */
193    virtual void interrupt();
194
195    /**
196     * This method must be invoked after getting control back from a draw functor.
197     *
198     * This command must not be recorded inside display lists.
199     */
200    virtual void resume();
201
202    ANDROID_API void setCountOverdrawEnabled(bool enabled) {
203        mCountOverdraw = enabled;
204    }
205
206    ANDROID_API float getOverdraw() {
207        return mCountOverdraw ? mOverdraw : 0.0f;
208    }
209
210    ANDROID_API status_t invokeFunctors(Rect& dirty);
211    ANDROID_API void detachFunctor(Functor* functor);
212    ANDROID_API void attachFunctor(Functor* functor);
213    virtual status_t callDrawGLFunction(Functor* functor, Rect& dirty);
214
215    ANDROID_API void pushLayerUpdate(Layer* layer);
216    ANDROID_API void cancelLayerUpdate(Layer* layer);
217    ANDROID_API void clearLayerUpdates();
218    ANDROID_API void flushLayerUpdates();
219
220    ANDROID_API int getSaveCount() const;
221    virtual int save(int flags);
222    virtual void restore();
223    virtual void restoreToCount(int saveCount);
224
225    ANDROID_API int saveLayer(float left, float top, float right, float bottom,
226            SkPaint* paint, int flags) {
227        SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode;
228        if (paint) mode = getXfermode(paint->getXfermode());
229        return saveLayer(left, top, right, bottom, paint ? paint->getAlpha() : 255, mode, flags);
230    }
231    ANDROID_API int saveLayerAlpha(float left, float top, float right, float bottom,
232            int alpha, int flags) {
233        return saveLayer(left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags);
234    }
235    virtual int saveLayer(float left, float top, float right, float bottom,
236            int alpha, SkXfermode::Mode mode, int flags);
237
238    int saveLayerDeferred(float left, float top, float right, float bottom,
239            int alpha, SkXfermode::Mode mode, int flags);
240
241    virtual void translate(float dx, float dy);
242    virtual void rotate(float degrees);
243    virtual void scale(float sx, float sy);
244    virtual void skew(float sx, float sy);
245
246    bool hasRectToRectTransform();
247    ANDROID_API void getMatrix(SkMatrix* matrix);
248    virtual void setMatrix(SkMatrix* matrix);
249    virtual void concatMatrix(SkMatrix* matrix);
250
251    ANDROID_API const Rect& getClipBounds();
252
253    /**
254     * Performs a quick reject but adjust the bounds to account for stroke width if necessary,
255     * and handling snapOut for AA geometry.
256     */
257    bool quickRejectPreStroke(float left, float top, float right, float bottom, SkPaint* paint);
258
259    /**
260     * Returns false and sets scissor based upon bounds if drawing won't be clipped out
261     */
262    bool quickReject(float left, float top, float right, float bottom, bool snapOut = false);
263    bool quickReject(const Rect& bounds) {
264        return quickReject(bounds.left, bounds.top, bounds.right, bounds.bottom);
265    }
266
267    /**
268     * Same as quickReject, without the scissor, instead returning clipRequired through pointer.
269     * clipRequired will be only set if not rejected
270     */
271    ANDROID_API bool quickRejectNoScissor(float left, float top, float right, float bottom,
272            bool snapOut = false, bool* clipRequired = NULL);
273    bool quickRejectNoScissor(const Rect& bounds, bool* clipRequired = NULL) {
274        return quickRejectNoScissor(bounds.left, bounds.top, bounds.right, bounds.bottom,
275                clipRequired);
276    }
277
278    virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
279    virtual bool clipPath(SkPath* path, SkRegion::Op op);
280    virtual bool clipRegion(SkRegion* region, SkRegion::Op op);
281    virtual Rect* getClipRect();
282
283    virtual status_t drawDisplayList(DisplayList* displayList, Rect& dirty, int32_t replayFlags);
284    virtual void outputDisplayList(DisplayList* displayList);
285    virtual status_t drawLayer(Layer* layer, float x, float y);
286    virtual status_t drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint);
287    status_t drawBitmaps(SkBitmap* bitmap, AssetAtlas::Entry* entry, int bitmapCount,
288            TextureVertex* vertices, bool pureTranslate, const Rect& bounds, SkPaint* paint);
289    virtual status_t drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint);
290    virtual status_t drawBitmap(SkBitmap* bitmap, float srcLeft, float srcTop,
291            float srcRight, float srcBottom, float dstLeft, float dstTop,
292            float dstRight, float dstBottom, SkPaint* paint);
293    virtual status_t drawBitmapData(SkBitmap* bitmap, float left, float top, SkPaint* paint);
294    virtual status_t drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight,
295            float* vertices, int* colors, SkPaint* paint);
296    status_t drawPatches(SkBitmap* bitmap, AssetAtlas::Entry* entry,
297            TextureVertex* vertices, uint32_t indexCount, SkPaint* paint);
298    virtual status_t drawPatch(SkBitmap* bitmap, Res_png_9patch* patch,
299            float left, float top, float right, float bottom, SkPaint* paint);
300    status_t drawPatch(SkBitmap* bitmap, const Patch* mesh, AssetAtlas::Entry* entry,
301            float left, float top, float right, float bottom, SkPaint* paint);
302    virtual status_t drawColor(int color, SkXfermode::Mode mode);
303    virtual status_t drawRect(float left, float top, float right, float bottom, SkPaint* paint);
304    virtual status_t drawRoundRect(float left, float top, float right, float bottom,
305            float rx, float ry, SkPaint* paint);
306    virtual status_t drawCircle(float x, float y, float radius, SkPaint* paint);
307    virtual status_t drawOval(float left, float top, float right, float bottom, SkPaint* paint);
308    virtual status_t drawArc(float left, float top, float right, float bottom,
309            float startAngle, float sweepAngle, bool useCenter, SkPaint* paint);
310    virtual status_t drawPath(SkPath* path, SkPaint* paint);
311    virtual status_t drawLines(float* points, int count, SkPaint* paint);
312    virtual status_t drawPoints(float* points, int count, SkPaint* paint);
313    virtual status_t drawTextOnPath(const char* text, int bytesCount, int count, SkPath* path,
314            float hOffset, float vOffset, SkPaint* paint);
315    virtual status_t drawPosText(const char* text, int bytesCount, int count,
316            const float* positions, SkPaint* paint);
317    virtual status_t drawText(const char* text, int bytesCount, int count, float x, float y,
318            const float* positions, SkPaint* paint, float totalAdvance, const Rect& bounds,
319            DrawOpMode drawOpMode = kDrawOpMode_Immediate);
320    virtual status_t drawRects(const float* rects, int count, SkPaint* paint);
321
322    virtual void resetShader();
323    virtual void setupShader(SkiaShader* shader);
324
325    virtual void resetColorFilter();
326    virtual void setupColorFilter(SkiaColorFilter* filter);
327
328    virtual void resetShadow();
329    virtual void setupShadow(float radius, float dx, float dy, int color);
330
331    virtual void resetPaintFilter();
332    virtual void setupPaintFilter(int clearBits, int setBits);
333
334    // If this value is set to < 1.0, it overrides alpha set on layer (see drawBitmap, drawLayer)
335    void setOverrideLayerAlpha(float alpha) { mDrawModifiers.mOverrideLayerAlpha = alpha; }
336
337    SkPaint* filterPaint(SkPaint* paint);
338
339    /**
340     * Store the current display state (most importantly, the current clip and transform), and
341     * additionally map the state's bounds from local to window coordinates.
342     *
343     * Returns true if quick-rejected
344     */
345    bool storeDisplayState(DeferredDisplayState& state, int stateDeferFlags);
346    void restoreDisplayState(const DeferredDisplayState& state, bool skipClipRestore = false);
347    void setupMergedMultiDraw(const Rect* clipRect);
348
349    const DrawModifiers& getDrawModifiers() { return mDrawModifiers; }
350    void setDrawModifiers(const DrawModifiers& drawModifiers) { mDrawModifiers = drawModifiers; }
351
352    ANDROID_API bool isCurrentTransformSimple() {
353        return mSnapshot->transform->isSimple();
354    }
355
356    Caches& getCaches() {
357        return mCaches;
358    }
359
360    // simple rect clip
361    bool isCurrentClipSimple() {
362        return mSnapshot->clipRegion->isEmpty();
363    }
364
365    int getViewportWidth() { return getSnapshot()->viewport.getWidth(); }
366    int getViewportHeight() { return getSnapshot()->viewport.getHeight(); }
367
368    /**
369     * Scales the alpha on the current snapshot. This alpha value will be modulated
370     * with other alpha values when drawing primitives.
371     */
372    void scaleAlpha(float alpha) {
373        mSnapshot->alpha *= alpha;
374    }
375
376    /**
377     * Inserts a named event marker in the stream of GL commands.
378     */
379    void eventMark(const char* name) const;
380
381    /**
382     * Inserts a named group marker in the stream of GL commands. This marker
383     * can be used by tools to group commands into logical groups. A call to
384     * this method must always be followed later on by a call to endMark().
385     */
386    void startMark(const char* name) const;
387
388    /**
389     * Closes the last group marker opened by startMark().
390     */
391    void endMark() const;
392
393    /**
394     * Gets the alpha and xfermode out of a paint object. If the paint is null
395     * alpha will be 255 and the xfermode will be SRC_OVER. This method does
396     * not multiply the paint's alpha by the current snapshot's alpha, and does
397     * not replace the alpha with the overrideLayerAlpha
398     *
399     * @param paint The paint to extract values from
400     * @param alpha Where to store the resulting alpha
401     * @param mode Where to store the resulting xfermode
402     */
403    static inline void getAlphaAndModeDirect(SkPaint* paint, int* alpha, SkXfermode::Mode* mode) {
404        *mode = getXfermodeDirect(paint);
405        *alpha = getAlphaDirect(paint);
406    }
407
408    static inline SkXfermode::Mode getXfermodeDirect(SkPaint* paint) {
409        if (!paint) return SkXfermode::kSrcOver_Mode;
410        return getXfermode(paint->getXfermode());
411    }
412
413    static inline int getAlphaDirect(const SkPaint* paint) {
414        if (!paint) return 255;
415        return paint->getAlpha();
416    }
417
418    /**
419     * Return the best transform to use to rasterize text given a full
420     * transform matrix.
421     */
422    mat4 findBestFontTransform(const mat4& transform) const;
423
424#if DEBUG_MERGE_BEHAVIOR
425    void drawScreenSpaceColorRect(float left, float top, float right, float bottom, int color) {
426        mCaches.setScissorEnabled(false);
427
428        // should only be called outside of other draw ops, so stencil can only be in test state
429        bool stencilWasEnabled = mCaches.stencil.isTestEnabled();
430        mCaches.stencil.disable();
431
432        drawColorRect(left, top, right, bottom, color, SkXfermode::kSrcOver_Mode, true);
433
434        if (stencilWasEnabled) mCaches.stencil.enableTest();
435    }
436#endif
437
438protected:
439    /**
440     * Computes the projection matrix, initialize the first snapshot
441     * and stores the dimensions of the render target.
442     */
443    void initViewport(int width, int height);
444
445    /**
446     * Perform the setup specific to a frame. This method does not
447     * issue any OpenGL commands.
448     */
449    void setupFrameState(float left, float top, float right, float bottom, bool opaque);
450
451    /**
452     * Indicates the start of rendering. This method will setup the
453     * initial OpenGL state (viewport, clearing the buffer, etc.)
454     */
455    status_t startFrame();
456
457    /**
458     * Clears the underlying surface if needed.
459     */
460    virtual status_t clear(float left, float top, float right, float bottom, bool opaque);
461
462    /**
463     * Call this method after updating a layer during a drawing pass.
464     */
465    void resumeAfterLayer();
466
467    /**
468     * This method is called whenever a stencil buffer is required. Subclasses
469     * should override this method and call attachStencilBufferToLayer() on the
470     * appropriate layer(s).
471     */
472    virtual void ensureStencilBuffer();
473
474    /**
475     * Obtains a stencil render buffer (allocating it if necessary) and
476     * attaches it to the specified layer.
477     */
478    void attachStencilBufferToLayer(Layer* layer);
479
480    /**
481     * Compose the layer defined in the current snapshot with the layer
482     * defined by the previous snapshot.
483     *
484     * The current snapshot *must* be a layer (flag kFlagIsLayer set.)
485     *
486     * @param curent The current snapshot containing the layer to compose
487     * @param previous The previous snapshot to compose the current layer with
488     */
489    virtual void composeLayer(sp<Snapshot> current, sp<Snapshot> previous);
490
491    /**
492     * Marks the specified region as dirty at the specified bounds.
493     */
494    void dirtyLayerUnchecked(Rect& bounds, Region* region);
495
496    /**
497     * Returns the current snapshot.
498     */
499    sp<Snapshot> getSnapshot() const {
500        return mSnapshot;
501    }
502
503    /**
504     * Returns the region of the current layer.
505     */
506    virtual Region* getRegion() const {
507        return mSnapshot->region;
508    }
509
510    /**
511     * Indicates whether rendering is currently targeted at a layer.
512     */
513    virtual bool hasLayer() const {
514        return (mSnapshot->flags & Snapshot::kFlagFboTarget) && mSnapshot->region;
515    }
516
517    /**
518     * Returns the name of the FBO this renderer is rendering into.
519     */
520    virtual GLint getTargetFbo() const {
521        return 0;
522    }
523
524    /**
525     * Renders the specified layer as a textured quad.
526     *
527     * @param layer The layer to render
528     * @param rect The bounds of the layer
529     */
530    void drawTextureLayer(Layer* layer, const Rect& rect);
531
532    /**
533     * Gets the alpha and xfermode out of a paint object. If the paint is null
534     * alpha will be 255 and the xfermode will be SRC_OVER. Accounts for both
535     * snapshot alpha, and overrideLayerAlpha
536     *
537     * @param paint The paint to extract values from
538     * @param alpha Where to store the resulting alpha
539     * @param mode Where to store the resulting xfermode
540     */
541    inline void getAlphaAndMode(SkPaint* paint, int* alpha, SkXfermode::Mode* mode) const;
542
543    /**
544     * Gets the alpha from a layer, accounting for snapshot alpha and overrideLayerAlpha
545     *
546     * @param layer The layer from which the alpha is extracted
547     */
548    inline float getLayerAlpha(Layer* layer) const;
549
550    /**
551     * Safely retrieves the mode from the specified xfermode. If the specified
552     * xfermode is null, the mode is assumed to be SkXfermode::kSrcOver_Mode.
553     */
554    static inline SkXfermode::Mode getXfermode(SkXfermode* mode) {
555        SkXfermode::Mode resultMode;
556        if (!SkXfermode::AsMode(mode, &resultMode)) {
557            resultMode = SkXfermode::kSrcOver_Mode;
558        }
559        return resultMode;
560    }
561
562    /**
563     * Set to true to suppress error checks at the end of a frame.
564     */
565    virtual bool suppressErrorChecks() const {
566        return false;
567    }
568
569private:
570    /**
571     * Discards the content of the framebuffer if supported by the driver.
572     * This method should be called at the beginning of a frame to optimize
573     * rendering on some tiler architectures.
574     */
575    void discardFramebuffer(float left, float top, float right, float bottom);
576
577    /**
578     * Ensures the state of the renderer is the same as the state of
579     * the GL context.
580     */
581    void syncState();
582
583    /**
584     * Tells the GPU what part of the screen is about to be redrawn.
585     * This method will use the clip rect that we started drawing the
586     * frame with.
587     * This method needs to be invoked every time getTargetFbo() is
588     * bound again.
589     */
590    void startTiling(const sp<Snapshot>& snapshot, bool opaque = false);
591
592    /**
593     * Tells the GPU what part of the screen is about to be redrawn.
594     * This method needs to be invoked every time getTargetFbo() is
595     * bound again.
596     */
597    void startTiling(const Rect& clip, int windowHeight, bool opaque = false);
598
599    /**
600     * Tells the GPU that we are done drawing the frame or that we
601     * are switching to another render target.
602     */
603    void endTiling();
604
605    /**
606     * Saves the current state of the renderer as a new snapshot.
607     * The new snapshot is saved in mSnapshot and the previous snapshot
608     * is linked from mSnapshot->previous.
609     *
610     * @param flags The save flags; see SkCanvas for more information
611     *
612     * @return The new save count. This value can be passed to #restoreToCount()
613     */
614    int saveSnapshot(int flags);
615
616    /**
617     * Restores the current snapshot; mSnapshot becomes mSnapshot->previous.
618     *
619     * @return True if the clip was modified.
620     */
621    bool restoreSnapshot();
622
623    /**
624     * Sets the clipping rectangle using glScissor. The clip is defined by
625     * the current snapshot's clipRect member.
626     */
627    void setScissorFromClip();
628
629    /**
630     * Sets the clipping region using the stencil buffer. The clip region
631     * is defined by the current snapshot's clipRegion member.
632     */
633    void setStencilFromClip();
634
635    /**
636     * Given the local bounds of the layer, calculates ...
637     */
638    void calculateLayerBoundsAndClip(Rect& bounds, Rect& clip, bool fboLayer);
639
640    /**
641     * Given the local bounds + clip of the layer, updates current snapshot's empty/invisible
642     */
643    void updateSnapshotIgnoreForLayer(const Rect& bounds, const Rect& clip,
644            bool fboLayer, int alpha);
645
646    /**
647     * Creates a new layer stored in the specified snapshot.
648     *
649     * @param snapshot The snapshot associated with the new layer
650     * @param left The left coordinate of the layer
651     * @param top The top coordinate of the layer
652     * @param right The right coordinate of the layer
653     * @param bottom The bottom coordinate of the layer
654     * @param alpha The translucency of the layer
655     * @param mode The blending mode of the layer
656     * @param flags The layer save flags
657     *
658     * @return True if the layer was successfully created, false otherwise
659     */
660    bool createLayer(float left, float top, float right, float bottom,
661            int alpha, SkXfermode::Mode mode, int flags);
662
663    /**
664     * Creates a new layer stored in the specified snapshot as an FBO.
665     *
666     * @param layer The layer to store as an FBO
667     * @param snapshot The snapshot associated with the new layer
668     * @param bounds The bounds of the layer
669     */
670    bool createFboLayer(Layer* layer, Rect& bounds, Rect& clip);
671
672    /**
673     * Compose the specified layer as a region.
674     *
675     * @param layer The layer to compose
676     * @param rect The layer's bounds
677     */
678    void composeLayerRegion(Layer* layer, const Rect& rect);
679
680    /**
681     * Compose the specified layer as a simple rectangle.
682     *
683     * @param layer The layer to compose
684     * @param rect The layer's bounds
685     * @param swap If true, the source and destination are swapped
686     */
687    void composeLayerRect(Layer* layer, const Rect& rect, bool swap = false);
688
689    /**
690     * Clears all the regions corresponding to the current list of layers.
691     * This method MUST be invoked before any drawing operation.
692     */
693    void clearLayerRegions();
694
695    /**
696     * Mark the layer as dirty at the specified coordinates. The coordinates
697     * are transformed with the supplied matrix.
698     */
699    void dirtyLayer(const float left, const float top,
700            const float right, const float bottom, const mat4 transform);
701
702    /**
703     * Mark the layer as dirty at the specified coordinates.
704     */
705    void dirtyLayer(const float left, const float top,
706            const float right, const float bottom);
707
708    /**
709     * Draws a colored rectangle with the specified color. The specified coordinates
710     * are transformed by the current snapshot's transform matrix unless specified
711     * otherwise.
712     *
713     * @param left The left coordinate of the rectangle
714     * @param top The top coordinate of the rectangle
715     * @param right The right coordinate of the rectangle
716     * @param bottom The bottom coordinate of the rectangle
717     * @param color The rectangle's ARGB color, defined as a packed 32 bits word
718     * @param mode The Skia xfermode to use
719     * @param ignoreTransform True if the current transform should be ignored
720     */
721    void drawColorRect(float left, float top, float right, float bottom,
722            int color, SkXfermode::Mode mode, bool ignoreTransform = false);
723
724    /**
725     * Draws a series of colored rectangles with the specified color. The specified
726     * coordinates are transformed by the current snapshot's transform matrix unless
727     * specified otherwise.
728     *
729     * @param rects A list of rectangles, 4 floats (left, top, right, bottom)
730     *              per rectangle
731     * @param color The rectangles' ARGB color, defined as a packed 32 bits word
732     * @param mode The Skia xfermode to use
733     * @param ignoreTransform True if the current transform should be ignored
734     * @param dirty True if calling this method should dirty the current layer
735     * @param clip True if the rects should be clipped, false otherwise
736     */
737    status_t drawColorRects(const float* rects, int count, int color,
738            SkXfermode::Mode mode, bool ignoreTransform = false,
739            bool dirty = true, bool clip = true);
740
741    /**
742     * Draws the shape represented by the specified path texture.
743     * This method invokes drawPathTexture() but takes into account
744     * the extra left/top offset and the texture offset to correctly
745     * position the final shape.
746     *
747     * @param left The left coordinate of the shape to render
748     * @param top The top coordinate of the shape to render
749     * @param texture The texture reprsenting the shape
750     * @param paint The paint to draw the shape with
751     */
752    status_t drawShape(float left, float top, const PathTexture* texture, SkPaint* paint);
753
754    /**
755     * Draws the specified texture as an alpha bitmap. Alpha bitmaps obey
756     * different compositing rules.
757     *
758     * @param texture The texture to draw with
759     * @param left The x coordinate of the bitmap
760     * @param top The y coordinate of the bitmap
761     * @param paint The paint to render with
762     */
763    void drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint);
764
765    /**
766     * Renders a strip of polygons with the specified paint, used for tessellated geometry.
767     *
768     * @param vertexBuffer The VertexBuffer to be drawn
769     * @param paint The paint to render with
770     * @param useOffset Offset the vertexBuffer (used in drawing non-AA lines)
771     */
772    status_t drawVertexBuffer(const VertexBuffer& vertexBuffer, SkPaint* paint,
773            bool useOffset = false);
774
775    /**
776     * Renders the convex hull defined by the specified path as a strip of polygons.
777     *
778     * @param path The hull of the path to draw
779     * @param paint The paint to render with
780     */
781    status_t drawConvexPath(const SkPath& path, SkPaint* paint);
782
783    /**
784     * Draws a textured rectangle with the specified texture. The specified coordinates
785     * are transformed by the current snapshot's transform matrix.
786     *
787     * @param left The left coordinate of the rectangle
788     * @param top The top coordinate of the rectangle
789     * @param right The right coordinate of the rectangle
790     * @param bottom The bottom coordinate of the rectangle
791     * @param texture The texture name to map onto the rectangle
792     * @param alpha An additional translucency parameter, between 0.0f and 1.0f
793     * @param mode The blending mode
794     * @param blend True if the texture contains an alpha channel
795     */
796    void drawTextureRect(float left, float top, float right, float bottom, GLuint texture,
797            float alpha, SkXfermode::Mode mode, bool blend);
798
799    /**
800     * Draws a textured rectangle with the specified texture. The specified coordinates
801     * are transformed by the current snapshot's transform matrix.
802     *
803     * @param left The left coordinate of the rectangle
804     * @param top The top coordinate of the rectangle
805     * @param right The right coordinate of the rectangle
806     * @param bottom The bottom coordinate of the rectangle
807     * @param texture The texture to use
808     * @param paint The paint containing the alpha, blending mode, etc.
809     */
810    void drawTextureRect(float left, float top, float right, float bottom,
811            Texture* texture, SkPaint* paint);
812
813    /**
814     * Draws a textured mesh with the specified texture. If the indices are omitted,
815     * the mesh is drawn as a simple quad. The mesh pointers become offsets when a
816     * VBO is bound.
817     *
818     * @param left The left coordinate of the rectangle
819     * @param top The top coordinate of the rectangle
820     * @param right The right coordinate of the rectangle
821     * @param bottom The bottom coordinate of the rectangle
822     * @param texture The texture name to map onto the rectangle
823     * @param alpha An additional translucency parameter, between 0.0f and 1.0f
824     * @param mode The blending mode
825     * @param blend True if the texture contains an alpha channel
826     * @param vertices The vertices that define the mesh
827     * @param texCoords The texture coordinates of each vertex
828     * @param elementsCount The number of elements in the mesh, required by indices
829     * @param swapSrcDst Whether or not the src and dst blending operations should be swapped
830     * @param ignoreTransform True if the current transform should be ignored
831     * @param vbo The VBO used to draw the mesh
832     * @param ignoreScale True if the model view matrix should not be scaled
833     * @param dirty True if calling this method should dirty the current layer
834     */
835    void drawTextureMesh(float left, float top, float right, float bottom, GLuint texture,
836            float alpha, SkXfermode::Mode mode, bool blend,
837            GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
838            bool swapSrcDst = false, bool ignoreTransform = false, GLuint vbo = 0,
839            bool ignoreScale = false, bool dirty = true);
840
841    void drawIndexedTextureMesh(float left, float top, float right, float bottom, GLuint texture,
842            float alpha, SkXfermode::Mode mode, bool blend,
843            GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
844            bool swapSrcDst = false, bool ignoreTransform = false, GLuint vbo = 0,
845            bool ignoreScale = false, bool dirty = true);
846
847    void drawAlpha8TextureMesh(float left, float top, float right, float bottom,
848            GLuint texture, bool hasColor, int color, int alpha, SkXfermode::Mode mode,
849            GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
850            bool ignoreTransform, bool ignoreScale = false, bool dirty = true);
851
852    /**
853     * Draws the specified list of vertices as quads using indexed GL_TRIANGLES.
854     * If the number of vertices to draw exceeds the number of indices we have
855     * pre-allocated, this method will generate several glDrawElements() calls.
856     */
857    void drawIndexedQuads(Vertex* mesh, GLsizei quadsCount);
858
859    /**
860     * Draws text underline and strike-through if needed.
861     *
862     * @param text The text to decor
863     * @param bytesCount The number of bytes in the text
864     * @param totalAdvance The total advance in pixels, defines underline/strikethrough length
865     * @param x The x coordinate where the text will be drawn
866     * @param y The y coordinate where the text will be drawn
867     * @param paint The paint to draw the text with
868     */
869    void drawTextDecorations(float totalAdvance, float x, float y, SkPaint* paint);
870
871   /**
872     * Draws shadow layer on text (with optional positions).
873     *
874     * @param paint The paint to draw the shadow with
875     * @param text The text to draw
876     * @param bytesCount The number of bytes in the text
877     * @param count The number of glyphs in the text
878     * @param positions The x, y positions of individual glyphs (or NULL)
879     * @param fontRenderer The font renderer object
880     * @param alpha The alpha value for drawing the shadow
881     * @param mode The xfermode for drawing the shadow
882     * @param x The x coordinate where the shadow will be drawn
883     * @param y The y coordinate where the shadow will be drawn
884     */
885    void drawTextShadow(SkPaint* paint, const char* text, int bytesCount, int count,
886            const float* positions, FontRenderer& fontRenderer, int alpha, SkXfermode::Mode mode,
887            float x, float y);
888
889    /**
890     * Draws a path texture. Path textures are alpha8 bitmaps that need special
891     * compositing to apply colors/filters/etc.
892     *
893     * @param texture The texture to render
894     * @param x The x coordinate where the texture will be drawn
895     * @param y The y coordinate where the texture will be drawn
896     * @param paint The paint to draw the texture with
897     */
898     void drawPathTexture(const PathTexture* texture, float x, float y, SkPaint* paint);
899
900    /**
901     * Resets the texture coordinates stored in mMeshVertices. Setting the values
902     * back to default is achieved by calling:
903     *
904     * resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
905     *
906     * @param u1 The left coordinate of the texture
907     * @param v1 The bottom coordinate of the texture
908     * @param u2 The right coordinate of the texture
909     * @param v2 The top coordinate of the texture
910     */
911    void resetDrawTextureTexCoords(float u1, float v1, float u2, float v2);
912
913    /**
914     * Returns true if the specified paint will draw invisible text.
915     */
916    bool canSkipText(const SkPaint* paint) const;
917
918    /**
919     * Binds the specified texture. The texture unit must have been selected
920     * prior to calling this method.
921     */
922    inline void bindTexture(GLuint texture) {
923        mCaches.bindTexture(texture);
924    }
925
926    /**
927     * Binds the specified EGLImage texture. The texture unit must have been selected
928     * prior to calling this method.
929     */
930    inline void bindExternalTexture(GLuint texture) {
931        mCaches.bindTexture(GL_TEXTURE_EXTERNAL_OES, texture);
932    }
933
934    /**
935     * Enable or disable blending as necessary. This function sets the appropriate
936     * blend function based on the specified xfermode.
937     */
938    inline void chooseBlending(bool blend, SkXfermode::Mode mode, ProgramDescription& description,
939            bool swapSrcDst = false);
940
941    /**
942     * Use the specified program with the current GL context. If the program is already
943     * in use, it will not be bound again. If it is not in use, the current program is
944     * marked unused and the specified program becomes used and becomes the new
945     * current program.
946     *
947     * @param program The program to use
948     *
949     * @return true If the specified program was already in use, false otherwise.
950     */
951    inline bool useProgram(Program* program);
952
953    /**
954     * Invoked before any drawing operation. This sets required state.
955     */
956    void setupDraw(bool clear = true);
957
958    /**
959     * Various methods to setup OpenGL rendering.
960     */
961    void setupDrawWithTexture(bool isAlpha8 = false);
962    void setupDrawWithTextureAndColor(bool isAlpha8 = false);
963    void setupDrawWithExternalTexture();
964    void setupDrawNoTexture();
965    void setupDrawAA();
966    void setupDrawColor(int color, int alpha);
967    void setupDrawColor(float r, float g, float b, float a);
968    void setupDrawAlpha8Color(int color, int alpha);
969    void setupDrawTextGamma(const SkPaint* paint);
970    void setupDrawShader();
971    void setupDrawColorFilter();
972    void setupDrawBlending(SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
973            bool swapSrcDst = false);
974    void setupDrawBlending(bool blend = true, SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
975            bool swapSrcDst = false);
976    void setupDrawProgram();
977    void setupDrawDirtyRegionsDisabled();
978    void setupDrawModelViewIdentity(bool offset = false);
979    void setupDrawModelView(float left, float top, float right, float bottom,
980            bool ignoreTransform = false, bool ignoreModelView = false);
981    void setupDrawModelViewTranslate(float left, float top, float right, float bottom,
982            bool ignoreTransform = false);
983    void setupDrawColorUniforms();
984    void setupDrawPureColorUniforms();
985    void setupDrawShaderIdentityUniforms();
986    void setupDrawShaderUniforms(bool ignoreTransform = false);
987    void setupDrawColorFilterUniforms();
988    void setupDrawSimpleMesh();
989    void setupDrawTexture(GLuint texture);
990    void setupDrawExternalTexture(GLuint texture);
991    void setupDrawTextureTransform();
992    void setupDrawTextureTransformUniforms(mat4& transform);
993    void setupDrawTextGammaUniforms();
994    void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords = NULL, GLuint vbo = 0);
995    void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords, GLvoid* colors);
996    void setupDrawMeshIndices(GLvoid* vertices, GLvoid* texCoords, GLuint vbo = 0);
997    void setupDrawIndexedVertices(GLvoid* vertices);
998    void accountForClear(SkXfermode::Mode mode);
999
1000    bool updateLayer(Layer* layer, bool inFrame);
1001    void updateLayers();
1002    void flushLayers();
1003
1004#if DEBUG_LAYERS_AS_REGIONS
1005    /**
1006     * Renders the specified region as a series of rectangles. This method
1007     * is used for debugging only.
1008     */
1009    void drawRegionRectsDebug(const Region& region);
1010#endif
1011
1012    /**
1013     * Renders the specified region as a series of rectangles. The region
1014     * must be in screen-space coordinates.
1015     */
1016    void drawRegionRects(const SkRegion& region, int color, SkXfermode::Mode mode,
1017            bool dirty = false);
1018
1019    /**
1020     * Draws the current clip region if any. Only when DEBUG_CLIP_REGIONS
1021     * is turned on.
1022     */
1023    void debugClip();
1024
1025    void debugOverdraw(bool enable, bool clear);
1026    void renderOverdraw();
1027    void countOverdraw();
1028
1029    /**
1030     * Should be invoked every time the glScissor is modified.
1031     */
1032    inline void dirtyClip() {
1033        mDirtyClip = true;
1034    }
1035
1036    inline mat4& currentTransform() const {
1037        return *mSnapshot->transform;
1038    }
1039
1040    inline const UvMapper& getMapper(const Texture* texture) {
1041        return texture && texture->uvMapper ? *texture->uvMapper : mUvMapper;
1042    }
1043
1044    /**
1045     * Returns a texture object for the specified bitmap. The texture can
1046     * come from the texture cache or an atlas. If this method returns
1047     * NULL, the texture could not be found and/or allocated.
1048     */
1049    Texture* getTexture(SkBitmap* bitmap);
1050
1051    // Dimensions of the drawing surface
1052    int mWidth, mHeight;
1053
1054    // Matrix used for ortho projection in shaders
1055    mat4 mOrthoMatrix;
1056
1057    // Model-view matrix used to position/size objects
1058    mat4 mModelView;
1059
1060    // Number of saved states
1061    int mSaveCount;
1062    // Base state
1063    sp<Snapshot> mFirstSnapshot;
1064    // Current state
1065    sp<Snapshot> mSnapshot;
1066    // State used to define the clipping region
1067    Rect mTilingClip;
1068    // Is the target render surface opaque
1069    bool mOpaque;
1070    // Is a frame currently being rendered
1071    bool mFrameStarted;
1072
1073    // Used to draw textured quads
1074    TextureVertex mMeshVertices[4];
1075
1076    // Default UV mapper
1077    const UvMapper mUvMapper;
1078
1079    // shader, filters, and shadow
1080    DrawModifiers mDrawModifiers;
1081    SkPaint mFilteredPaint;
1082
1083    // Various caches
1084    Caches& mCaches;
1085    Extensions& mExtensions;
1086
1087    // List of rectangles to clear after saveLayer() is invoked
1088    Vector<Rect*> mLayers;
1089    // List of functors to invoke after a frame is drawn
1090    SortedVector<Functor*> mFunctors;
1091    // List of layers to update at the beginning of a frame
1092    Vector<Layer*> mLayerUpdates;
1093
1094    // Indicates whether the clip must be restored
1095    bool mDirtyClip;
1096
1097    // The following fields are used to setup drawing
1098    // Used to describe the shaders to generate
1099    ProgramDescription mDescription;
1100    // Color description
1101    bool mColorSet;
1102    float mColorA, mColorR, mColorG, mColorB;
1103    // Indicates that the shader should get a color
1104    bool mSetShaderColor;
1105    // Current texture unit
1106    GLuint mTextureUnit;
1107    // Track dirty regions, true by default
1108    bool mTrackDirtyRegions;
1109    // Indicate whether we are drawing an opaque frame
1110    bool mOpaqueFrame;
1111
1112    // See PROPERTY_DISABLE_SCISSOR_OPTIMIZATION in
1113    // Properties.h
1114    bool mScissorOptimizationDisabled;
1115
1116    // No-ops start/endTiling when set
1117    bool mSuppressTiling;
1118
1119    // If true, this renderer will setup drawing to emulate
1120    // an increment stencil buffer in the color buffer
1121    bool mCountOverdraw;
1122    float mOverdraw;
1123
1124    // Optional name of the renderer
1125    String8 mName;
1126
1127    friend class DisplayListRenderer;
1128    friend class Layer;
1129    friend class TextSetupFunctor;
1130    friend class DrawBitmapOp;
1131    friend class DrawPatchOp;
1132
1133}; // class OpenGLRenderer
1134
1135}; // namespace uirenderer
1136}; // namespace android
1137
1138#endif // ANDROID_HWUI_OPENGL_RENDERER_H
1139