libs/hwui/LayerRenderer.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2011 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 "LayerCache.h"
 #include "LayerRenderer.h"
 #include "Matrix.h"
 #include "Properties.h"
 #include "Rect.h"
 #include "renderstate/RenderState.h"
 #include "utils/GLUtils.h"
 #include "utils/TraceUtils.h"

 #include <ui/Rect.h>

 #include <private/hwui/DrawGlInfo.h>


 namespace android {
 namespace uirenderer {

 ///////////////////////////////////////////////////////////////////////////////
 // Rendering
 ///////////////////////////////////////////////////////////////////////////////

 LayerRenderer::LayerRenderer(RenderState& renderState, Layer* layer)
         : OpenGLRenderer(renderState)
         , mLayer(layer) {
 }

 LayerRenderer::~LayerRenderer() {
 }

 void LayerRenderer::prepareDirty(int viewportWidth, int viewportHeight,
         float left, float top, float right, float bottom, bool opaque) {
     LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo());

     mRenderState.bindFramebuffer(mLayer->getFbo());

     const float width = mLayer->layer.getWidth();
     const float height = mLayer->layer.getHeight();

     Rect dirty(left, top, right, bottom);
     if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
             dirty.right >= width && dirty.bottom >= height)) {
         mLayer->region.clear();
         dirty.set(0.0f, 0.0f, width, height);
     } else {
         dirty.doIntersect(0.0f, 0.0f, width, height);
         android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
         mLayer->region.subtractSelf(r);
     }
     mLayer->clipRect.set(dirty);

     OpenGLRenderer::prepareDirty(viewportWidth, viewportHeight,
             dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
 }

 void LayerRenderer::clear(float left, float top, float right, float bottom, bool opaque) {
     if (mLayer->isDirty()) {
         mRenderState.scissor().setEnabled(false);
         glClear(GL_COLOR_BUFFER_BIT);

         mRenderState.scissor().reset();
         mLayer->setDirty(false);
     } else {
         OpenGLRenderer::clear(left, top, right, bottom, opaque);
     }
 }

 bool LayerRenderer::finish() {
     bool retval = OpenGLRenderer::finish();

     generateMesh();

     LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo());

     // No need to unbind our FBO, this will be taken care of by the caller
     // who will invoke OpenGLRenderer::resume()
     return retval;
 }

 GLuint LayerRenderer::getTargetFbo() const {
     return mLayer->getFbo();
 }

 bool LayerRenderer::suppressErrorChecks() const {
     return true;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Layer support
 ///////////////////////////////////////////////////////////////////////////////

 bool LayerRenderer::hasLayer() const {
     return true;
 }

 void LayerRenderer::ensureStencilBuffer() {
     attachStencilBufferToLayer(mLayer);
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Dirty region tracking
 ///////////////////////////////////////////////////////////////////////////////

 Region* LayerRenderer::getRegion() const {
     if (mState.currentFlags() & Snapshot::kFlagFboTarget) {
         return OpenGLRenderer::getRegion();
     }
     return &mLayer->region;
 }

 // TODO: This implementation uses a very simple approach to fixing T-junctions which keeps the
 //       results as rectangles, and is thus not necessarily efficient in the geometry
 //       produced. Eventually, it may be better to develop triangle-based mechanism.
 void LayerRenderer::generateMesh() {
     if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
         if (mLayer->mesh) {
             delete[] mLayer->mesh;
             mLayer->mesh = nullptr;
             mLayer->meshElementCount = 0;
         }

         mLayer->setRegionAsRect();
         return;
     }

     // avoid T-junctions as they cause artifacts in between the resultant
     // geometry when complex transforms occur.
     // TODO: generate the safeRegion only if necessary based on drawing transform (see
     // OpenGLRenderer::composeLayerRegion())
     Region safeRegion = Region::createTJunctionFreeRegion(mLayer->region);

     size_t count;
     const android::Rect* rects = safeRegion.getArray(&count);

     GLsizei elementCount = count * 6;

     if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
         delete[] mLayer->mesh;
         mLayer->mesh = nullptr;
     }

     if (!mLayer->mesh) {
         mLayer->mesh = new TextureVertex[count * 4];
     }
     mLayer->meshElementCount = elementCount;

     const float texX = 1.0f / float(mLayer->getWidth());
     const float texY = 1.0f / float(mLayer->getHeight());
     const float height = mLayer->layer.getHeight();

     TextureVertex* mesh = mLayer->mesh;

     for (size_t i = 0; i < count; i++) {
         const android::Rect* r = &rects[i];

         const float u1 = r->left * texX;
         const float v1 = (height - r->top) * texY;
         const float u2 = r->right * texX;
         const float v2 = (height - r->bottom) * texY;

         TextureVertex::set(mesh++, r->left, r->top, u1, v1);
         TextureVertex::set(mesh++, r->right, r->top, u2, v1);
         TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
         TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
     }
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Layers management
 ///////////////////////////////////////////////////////////////////////////////

 Layer* LayerRenderer::createRenderLayer(RenderState& renderState, uint32_t width, uint32_t height) {
     ATRACE_FORMAT("Allocate %ux%u HW Layer", width, height);
     LAYER_RENDERER_LOGD("Requesting new render layer %dx%d", width, height);

     Caches& caches = Caches::getInstance();
     GLuint fbo = renderState.genFramebuffer();
     if (!fbo) {
         ALOGW("Could not obtain an FBO");
         return nullptr;
     }

     caches.textureState().activateTexture(0);
     Layer* layer = caches.layerCache.get(renderState, width, height);
     if (!layer) {
         ALOGW("Could not obtain a layer");
         return nullptr;
     }

     // We first obtain a layer before comparing against the max texture size
     // because layers are not allocated at the exact desired size. They are
     // always created slightly larger to improve recycling
     const uint32_t maxTextureSize = caches.maxTextureSize;
     if (layer->getWidth() > maxTextureSize || layer->getHeight() > maxTextureSize) {
         ALOGW("Layer exceeds max. dimensions supported by the GPU (%dx%d, max=%dx%d)",
                 width, height, maxTextureSize, maxTextureSize);

         // Creating a new layer always increment its refcount by 1, this allows
         // us to destroy the layer object if one was created for us
         layer->decStrong(nullptr);

         return nullptr;
     }

     layer->setFbo(fbo);
     layer->layer.set(0.0f, 0.0f, width, height);
     layer->texCoords.set(0.0f, height / float(layer->getHeight()),
             width / float(layer->getWidth()), 0.0f);
     layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
     layer->setColorFilter(nullptr);
     layer->setDirty(true);
     layer->region.clear();

     GLuint previousFbo = renderState.getFramebuffer();

     renderState.bindFramebuffer(layer->getFbo());
     layer->bindTexture();

     // Initialize the texture if needed
     if (layer->isEmpty()) {
         layer->setEmpty(false);
         layer->allocateTexture();

         // This should only happen if we run out of memory
         if (CC_UNLIKELY(GLUtils::dumpGLErrors())) {
             LOG_ALWAYS_FATAL("Could not allocate texture for layer (fbo=%d %dx%d)",
                     fbo, width, height);
             renderState.bindFramebuffer(previousFbo);
             layer->decStrong(nullptr);
             return nullptr;
         }
     }

     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
             layer->getTextureId(), 0);

     renderState.bindFramebuffer(previousFbo);

     return layer;
 }

 bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
     if (layer) {
         LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height);

         if (layer->resize(width, height)) {
             layer->layer.set(0.0f, 0.0f, width, height);
             layer->texCoords.set(0.0f, height / float(layer->getHeight()),
                     width / float(layer->getWidth()), 0.0f);
         } else {
             return false;
         }
     }

     return true;
 }

 Layer* LayerRenderer::createTextureLayer(RenderState& renderState) {
     LAYER_RENDERER_LOGD("Creating new texture layer");

     Layer* layer = new Layer(Layer::Type::Texture, renderState, 0, 0);
     layer->setCacheable(false);
     layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
     layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
     layer->region.clear();
     layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer()

     Caches::getInstance().textureState().activateTexture(0);
     layer->generateTexture();

     return layer;
 }

 void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
         bool isOpaque, bool forceFilter, GLenum renderTarget, const float* textureTransform) {
     if (layer) {
         layer->setBlend(!isOpaque);
         layer->setForceFilter(forceFilter);
         layer->setSize(width, height);
         layer->layer.set(0.0f, 0.0f, width, height);
         layer->region.set(width, height);
         layer->regionRect.set(0.0f, 0.0f, width, height);
         layer->getTexTransform().load(textureTransform);

         if (renderTarget != layer->getRenderTarget()) {
             layer->setRenderTarget(renderTarget);
             layer->bindTexture();
             layer->setFilter(GL_NEAREST, false, true);
             layer->setWrap(GL_CLAMP_TO_EDGE, false, true);
         }
     }
 }

 void LayerRenderer::destroyLayer(Layer* layer) {
     if (layer) {
         ATRACE_FORMAT("Destroy %ux%u HW Layer", layer->getWidth(), layer->getHeight());
         LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d",
                 layer->getWidth(), layer->getHeight(), layer->getFbo());

         if (!Caches::getInstance().layerCache.put(layer)) {
             LAYER_RENDERER_LOGD("  Destroyed!");
             layer->decStrong(nullptr);
         } else {
             LAYER_RENDERER_LOGD("  Cached!");
 #if DEBUG_LAYER_RENDERER
             Caches::getInstance().layerCache.dump();
 #endif
             layer->removeFbo();
             layer->region.clear();
         }
     }
 }

 void LayerRenderer::flushLayer(RenderState& renderState, Layer* layer) {
 #ifdef GL_EXT_discard_framebuffer
     if (!layer) return;

     GLuint fbo = layer->getFbo();
     if (fbo) {
         // If possible, discard any enqueud operations on deferred
         // rendering architectures
         if (Caches::getInstance().extensions().hasDiscardFramebuffer()) {
             GLuint previousFbo = renderState.getFramebuffer();
             if (fbo != previousFbo) {
                 renderState.bindFramebuffer(fbo);
             }

             const GLenum attachments[] = { GL_COLOR_ATTACHMENT0 };
             glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);

             if (fbo != previousFbo) {
                 renderState.bindFramebuffer(previousFbo);
             }
         }
     }
 #endif
 }

 bool LayerRenderer::copyLayer(RenderState& renderState, Layer* layer, SkBitmap* bitmap) {
     Caches& caches = Caches::getInstance();
     if (layer
             && bitmap->width() <= caches.maxTextureSize
             && bitmap->height() <= caches.maxTextureSize) {

         GLuint fbo = renderState.getFramebuffer();
         if (!fbo) {
             ALOGW("Could not obtain an FBO");
             return false;
         }

         SkAutoLockPixels alp(*bitmap);

         GLuint texture;
         GLuint previousFbo;
         GLsizei previousViewportWidth;
         GLsizei previousViewportHeight;

         GLenum format;
         GLenum type;

         bool status = false;

         switch (bitmap->colorType()) {
             case kAlpha_8_SkColorType:
                 format = GL_ALPHA;
                 type = GL_UNSIGNED_BYTE;
                 break;
             case kRGB_565_SkColorType:
                 format = GL_RGB;
                 type = GL_UNSIGNED_SHORT_5_6_5;
                 break;
             case kARGB_4444_SkColorType:
                 format = GL_RGBA;
                 type = GL_UNSIGNED_SHORT_4_4_4_4;
                 break;
             case kN32_SkColorType:
             default:
                 format = GL_RGBA;
                 type = GL_UNSIGNED_BYTE;
                 break;
         }

         float alpha = layer->getAlpha();
         SkXfermode::Mode mode = layer->getMode();
         GLuint previousLayerFbo = layer->getFbo();

         layer->setAlpha(255, SkXfermode::kSrc_Mode);
         layer->setFbo(fbo);

         previousFbo = renderState.getFramebuffer();
         renderState.getViewport(&previousViewportWidth, &previousViewportHeight);
         renderState.bindFramebuffer(fbo);

         glGenTextures(1, &texture);

         caches.textureState().activateTexture(0);
         caches.textureState().bindTexture(texture);

         glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());

         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

         glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(),
                 0, format, type, nullptr);

         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                 GL_TEXTURE_2D, texture, 0);

         {
             LayerRenderer renderer(renderState, layer);
             renderer.OpenGLRenderer::prepareDirty(bitmap->width(), bitmap->height(),
                     0.0f, 0.0f, bitmap->width(), bitmap->height(), !layer->isBlend());

             renderState.scissor().setEnabled(false);
             renderer.translate(0.0f, bitmap->height());
             renderer.scale(1.0f, -1.0f);

             {
                 Rect bounds;
                 bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height());
                 renderer.drawTextureLayer(layer, bounds);

                 glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
                         type, bitmap->getPixels());

             }

             status = true;
         }

         renderState.bindFramebuffer(previousFbo);
         layer->setAlpha(alpha, mode);
         layer->setFbo(previousLayerFbo);
         caches.textureState().deleteTexture(texture);
         renderState.deleteFramebuffer(fbo);
         renderState.setViewport(previousViewportWidth, previousViewportHeight);

         GL_CHECKPOINT(MODERATE);

         return status;
     }
     return false;
 }

 }; // namespace uirenderer
 }; // namespace android
	/*
	* Copyright (C) 2011 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 "LayerCache.h"
	#include "LayerRenderer.h"
	#include "Matrix.h"
	#include "Properties.h"
	#include "Rect.h"
	#include "renderstate/RenderState.h"
	#include "utils/GLUtils.h"
	#include "utils/TraceUtils.h"

	#include <ui/Rect.h>

	#include <private/hwui/DrawGlInfo.h>


	namespace android {
	namespace uirenderer {

	///////////////////////////////////////////////////////////////////////////////
	// Rendering
	///////////////////////////////////////////////////////////////////////////////

	LayerRenderer::LayerRenderer(RenderState& renderState, Layer* layer)
	: OpenGLRenderer(renderState)
	, mLayer(layer) {
	}

	LayerRenderer::~LayerRenderer() {
	}

	void LayerRenderer::prepareDirty(int viewportWidth, int viewportHeight,
	float left, float top, float right, float bottom, bool opaque) {
	LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo());

	mRenderState.bindFramebuffer(mLayer->getFbo());

	const float width = mLayer->layer.getWidth();
	const float height = mLayer->layer.getHeight();

	Rect dirty(left, top, right, bottom);
	if (dirty.isEmpty() \|\| (dirty.left <= 0 && dirty.top <= 0 &&
	dirty.right >= width && dirty.bottom >= height)) {
	mLayer->region.clear();
	dirty.set(0.0f, 0.0f, width, height);
	} else {
	dirty.doIntersect(0.0f, 0.0f, width, height);
	android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
	mLayer->region.subtractSelf(r);
	}
	mLayer->clipRect.set(dirty);

	OpenGLRenderer::prepareDirty(viewportWidth, viewportHeight,
	dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
	}

	void LayerRenderer::clear(float left, float top, float right, float bottom, bool opaque) {
	if (mLayer->isDirty()) {
	mRenderState.scissor().setEnabled(false);
	glClear(GL_COLOR_BUFFER_BIT);

	mRenderState.scissor().reset();
	mLayer->setDirty(false);
	} else {
	OpenGLRenderer::clear(left, top, right, bottom, opaque);
	}
	}

	bool LayerRenderer::finish() {
	bool retval = OpenGLRenderer::finish();

	generateMesh();

	LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo());

	// No need to unbind our FBO, this will be taken care of by the caller
	// who will invoke OpenGLRenderer::resume()
	return retval;
	}

	GLuint LayerRenderer::getTargetFbo() const {
	return mLayer->getFbo();
	}

	bool LayerRenderer::suppressErrorChecks() const {
	return true;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Layer support
	///////////////////////////////////////////////////////////////////////////////

	bool LayerRenderer::hasLayer() const {
	return true;
	}

	void LayerRenderer::ensureStencilBuffer() {
	attachStencilBufferToLayer(mLayer);
	}

	///////////////////////////////////////////////////////////////////////////////
	// Dirty region tracking
	///////////////////////////////////////////////////////////////////////////////

	Region* LayerRenderer::getRegion() const {
	if (mState.currentFlags() & Snapshot::kFlagFboTarget) {
	return OpenGLRenderer::getRegion();
	}
	return &mLayer->region;
	}

	// TODO: This implementation uses a very simple approach to fixing T-junctions which keeps the
	// results as rectangles, and is thus not necessarily efficient in the geometry
	// produced. Eventually, it may be better to develop triangle-based mechanism.
	void LayerRenderer::generateMesh() {
	if (mLayer->region.isRect() \|\| mLayer->region.isEmpty()) {
	if (mLayer->mesh) {
	delete[] mLayer->mesh;
	mLayer->mesh = nullptr;
	mLayer->meshElementCount = 0;
	}

	mLayer->setRegionAsRect();
	return;
	}

	// avoid T-junctions as they cause artifacts in between the resultant
	// geometry when complex transforms occur.
	// TODO: generate the safeRegion only if necessary based on drawing transform (see
	// OpenGLRenderer::composeLayerRegion())
	Region safeRegion = Region::createTJunctionFreeRegion(mLayer->region);

	size_t count;
	const android::Rect* rects = safeRegion.getArray(&count);

	GLsizei elementCount = count * 6;

	if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
	delete[] mLayer->mesh;
	mLayer->mesh = nullptr;
	}

	if (!mLayer->mesh) {
	mLayer->mesh = new TextureVertex[count * 4];
	}
	mLayer->meshElementCount = elementCount;

	const float texX = 1.0f / float(mLayer->getWidth());
	const float texY = 1.0f / float(mLayer->getHeight());
	const float height = mLayer->layer.getHeight();

	TextureVertex* mesh = mLayer->mesh;

	for (size_t i = 0; i < count; i++) {
	const android::Rect* r = &rects[i];

	const float u1 = r->left * texX;
	const float v1 = (height - r->top) * texY;
	const float u2 = r->right * texX;
	const float v2 = (height - r->bottom) * texY;

	TextureVertex::set(mesh++, r->left, r->top, u1, v1);
	TextureVertex::set(mesh++, r->right, r->top, u2, v1);
	TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
	TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
	}
	}

	///////////////////////////////////////////////////////////////////////////////
	// Layers management
	///////////////////////////////////////////////////////////////////////////////

	Layer* LayerRenderer::createRenderLayer(RenderState& renderState, uint32_t width, uint32_t height) {
	ATRACE_FORMAT("Allocate %ux%u HW Layer", width, height);
	LAYER_RENDERER_LOGD("Requesting new render layer %dx%d", width, height);

	Caches& caches = Caches::getInstance();
	GLuint fbo = renderState.genFramebuffer();
	if (!fbo) {
	ALOGW("Could not obtain an FBO");
	return nullptr;
	}

	caches.textureState().activateTexture(0);
	Layer* layer = caches.layerCache.get(renderState, width, height);
	if (!layer) {
	ALOGW("Could not obtain a layer");
	return nullptr;
	}

	// We first obtain a layer before comparing against the max texture size
	// because layers are not allocated at the exact desired size. They are
	// always created slightly larger to improve recycling
	const uint32_t maxTextureSize = caches.maxTextureSize;
	if (layer->getWidth() > maxTextureSize \|\| layer->getHeight() > maxTextureSize) {
	ALOGW("Layer exceeds max. dimensions supported by the GPU (%dx%d, max=%dx%d)",
	width, height, maxTextureSize, maxTextureSize);

	// Creating a new layer always increment its refcount by 1, this allows
	// us to destroy the layer object if one was created for us
	layer->decStrong(nullptr);

	return nullptr;
	}

	layer->setFbo(fbo);
	layer->layer.set(0.0f, 0.0f, width, height);
	layer->texCoords.set(0.0f, height / float(layer->getHeight()),
	width / float(layer->getWidth()), 0.0f);
	layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
	layer->setColorFilter(nullptr);
	layer->setDirty(true);
	layer->region.clear();

	GLuint previousFbo = renderState.getFramebuffer();

	renderState.bindFramebuffer(layer->getFbo());
	layer->bindTexture();

	// Initialize the texture if needed
	if (layer->isEmpty()) {
	layer->setEmpty(false);
	layer->allocateTexture();

	// This should only happen if we run out of memory
	if (CC_UNLIKELY(GLUtils::dumpGLErrors())) {
	LOG_ALWAYS_FATAL("Could not allocate texture for layer (fbo=%d %dx%d)",
	fbo, width, height);
	renderState.bindFramebuffer(previousFbo);
	layer->decStrong(nullptr);
	return nullptr;
	}
	}

	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
	layer->getTextureId(), 0);

	renderState.bindFramebuffer(previousFbo);

	return layer;
	}

	bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
	if (layer) {
	LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height);

	if (layer->resize(width, height)) {
	layer->layer.set(0.0f, 0.0f, width, height);
	layer->texCoords.set(0.0f, height / float(layer->getHeight()),
	width / float(layer->getWidth()), 0.0f);
	} else {
	return false;
	}
	}

	return true;
	}

	Layer* LayerRenderer::createTextureLayer(RenderState& renderState) {
	LAYER_RENDERER_LOGD("Creating new texture layer");

	Layer* layer = new Layer(Layer::Type::Texture, renderState, 0, 0);
	layer->setCacheable(false);
	layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
	layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
	layer->region.clear();
	layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer()

	Caches::getInstance().textureState().activateTexture(0);
	layer->generateTexture();

	return layer;
	}

	void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
	bool isOpaque, bool forceFilter, GLenum renderTarget, const float* textureTransform) {
	if (layer) {
	layer->setBlend(!isOpaque);
	layer->setForceFilter(forceFilter);
	layer->setSize(width, height);
	layer->layer.set(0.0f, 0.0f, width, height);
	layer->region.set(width, height);
	layer->regionRect.set(0.0f, 0.0f, width, height);
	layer->getTexTransform().load(textureTransform);

	if (renderTarget != layer->getRenderTarget()) {
	layer->setRenderTarget(renderTarget);
	layer->bindTexture();
	layer->setFilter(GL_NEAREST, false, true);
	layer->setWrap(GL_CLAMP_TO_EDGE, false, true);
	}
	}
	}

	void LayerRenderer::destroyLayer(Layer* layer) {
	if (layer) {
	ATRACE_FORMAT("Destroy %ux%u HW Layer", layer->getWidth(), layer->getHeight());
	LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d",
	layer->getWidth(), layer->getHeight(), layer->getFbo());

	if (!Caches::getInstance().layerCache.put(layer)) {
	LAYER_RENDERER_LOGD(" Destroyed!");
	layer->decStrong(nullptr);
	} else {
	LAYER_RENDERER_LOGD(" Cached!");
	#if DEBUG_LAYER_RENDERER
	Caches::getInstance().layerCache.dump();
	#endif
	layer->removeFbo();
	layer->region.clear();
	}
	}
	}

	void LayerRenderer::flushLayer(RenderState& renderState, Layer* layer) {
	#ifdef GL_EXT_discard_framebuffer
	if (!layer) return;

	GLuint fbo = layer->getFbo();
	if (fbo) {
	// If possible, discard any enqueud operations on deferred
	// rendering architectures
	if (Caches::getInstance().extensions().hasDiscardFramebuffer()) {
	GLuint previousFbo = renderState.getFramebuffer();
	if (fbo != previousFbo) {
	renderState.bindFramebuffer(fbo);
	}

	const GLenum attachments[] = { GL_COLOR_ATTACHMENT0 };
	glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);

	if (fbo != previousFbo) {
	renderState.bindFramebuffer(previousFbo);
	}
	}
	}
	#endif
	}

	bool LayerRenderer::copyLayer(RenderState& renderState, Layer* layer, SkBitmap* bitmap) {
	Caches& caches = Caches::getInstance();
	if (layer
	&& bitmap->width() <= caches.maxTextureSize
	&& bitmap->height() <= caches.maxTextureSize) {

	GLuint fbo = renderState.getFramebuffer();
	if (!fbo) {
	ALOGW("Could not obtain an FBO");
	return false;
	}

	SkAutoLockPixels alp(*bitmap);

	GLuint texture;
	GLuint previousFbo;
	GLsizei previousViewportWidth;
	GLsizei previousViewportHeight;

	GLenum format;
	GLenum type;

	bool status = false;

	switch (bitmap->colorType()) {
	case kAlpha_8_SkColorType:
	format = GL_ALPHA;
	type = GL_UNSIGNED_BYTE;
	break;
	case kRGB_565_SkColorType:
	format = GL_RGB;
	type = GL_UNSIGNED_SHORT_5_6_5;
	break;
	case kARGB_4444_SkColorType:
	format = GL_RGBA;
	type = GL_UNSIGNED_SHORT_4_4_4_4;
	break;
	case kN32_SkColorType:
	default:
	format = GL_RGBA;
	type = GL_UNSIGNED_BYTE;
	break;
	}

	float alpha = layer->getAlpha();
	SkXfermode::Mode mode = layer->getMode();
	GLuint previousLayerFbo = layer->getFbo();

	layer->setAlpha(255, SkXfermode::kSrc_Mode);
	layer->setFbo(fbo);

	previousFbo = renderState.getFramebuffer();
	renderState.getViewport(&previousViewportWidth, &previousViewportHeight);
	renderState.bindFramebuffer(fbo);

	glGenTextures(1, &texture);

	caches.textureState().activateTexture(0);
	caches.textureState().bindTexture(texture);

	glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

	glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(),
	0, format, type, nullptr);

	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
	GL_TEXTURE_2D, texture, 0);

	{
	LayerRenderer renderer(renderState, layer);
	renderer.OpenGLRenderer::prepareDirty(bitmap->width(), bitmap->height(),
	0.0f, 0.0f, bitmap->width(), bitmap->height(), !layer->isBlend());

	renderState.scissor().setEnabled(false);
	renderer.translate(0.0f, bitmap->height());
	renderer.scale(1.0f, -1.0f);

	{
	Rect bounds;
	bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height());
	renderer.drawTextureLayer(layer, bounds);

	glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
	type, bitmap->getPixels());

	}

	status = true;
	}

	renderState.bindFramebuffer(previousFbo);
	layer->setAlpha(alpha, mode);
	layer->setFbo(previousLayerFbo);
	caches.textureState().deleteTexture(texture);
	renderState.deleteFramebuffer(fbo);
	renderState.setViewport(previousViewportWidth, previousViewportHeight);

	GL_CHECKPOINT(MODERATE);

	return status;
	}
	return false;
	}

	}; // namespace uirenderer
	}; // namespace android