libs/hwui/hwui/Bitmap.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2015 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 "Bitmap.h"

 #include "HardwareBitmapUploader.h"
 #include "Properties.h"
 #include "renderthread/RenderProxy.h"
 #include "utils/Color.h"
 #include <utils/Trace.h>

 #include <sys/mman.h>

 #include <cutils/ashmem.h>
 #include <log/log.h>

 #include <binder/IServiceManager.h>
 #include <private/gui/ComposerService.h>
 #include <ui/PixelFormat.h>

 #include <SkCanvas.h>
 #include <SkImagePriv.h>

 #include <SkHighContrastFilter.h>
 #include <limits>

 namespace android {

 // returns true if rowBytes * height can be represented by a positive int32_t value
 // and places that value in size.
 static bool computeAllocationSize(size_t rowBytes, int height, size_t* size) {
     return 0 <= height && height <= std::numeric_limits<size_t>::max() &&
            !__builtin_mul_overflow(rowBytes, (size_t)height, size) &&
            *size <= std::numeric_limits<int32_t>::max();
 }

 typedef sk_sp<Bitmap> (*AllocPixelRef)(size_t allocSize, const SkImageInfo& info, size_t rowBytes);

 static sk_sp<Bitmap> allocateBitmap(SkBitmap* bitmap, AllocPixelRef alloc) {
     const SkImageInfo& info = bitmap->info();
     if (info.colorType() == kUnknown_SkColorType) {
         LOG_ALWAYS_FATAL("unknown bitmap configuration");
         return nullptr;
     }

     size_t size;

     // we must respect the rowBytes value already set on the bitmap instead of
     // attempting to compute our own.
     const size_t rowBytes = bitmap->rowBytes();
     if (!computeAllocationSize(rowBytes, bitmap->height(), &size)) {
         return nullptr;
     }

     auto wrapper = alloc(size, info, rowBytes);
     if (wrapper) {
         wrapper->getSkBitmap(bitmap);
     }
     return wrapper;
 }

 sk_sp<Bitmap> Bitmap::allocateAshmemBitmap(SkBitmap* bitmap) {
     return allocateBitmap(bitmap, &Bitmap::allocateAshmemBitmap);
 }

 sk_sp<Bitmap> Bitmap::allocateAshmemBitmap(size_t size, const SkImageInfo& info, size_t rowBytes) {
     // Create new ashmem region with read/write priv
     int fd = ashmem_create_region("bitmap", size);
     if (fd < 0) {
         return nullptr;
     }

     void* addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
     if (addr == MAP_FAILED) {
         close(fd);
         return nullptr;
     }

     if (ashmem_set_prot_region(fd, PROT_READ) < 0) {
         munmap(addr, size);
         close(fd);
         return nullptr;
     }
     return sk_sp<Bitmap>(new Bitmap(addr, fd, size, info, rowBytes));
 }

 sk_sp<Bitmap> Bitmap::allocateHardwareBitmap(const SkBitmap& bitmap) {
     return uirenderer::HardwareBitmapUploader::allocateHardwareBitmap(bitmap);
 }

 sk_sp<Bitmap> Bitmap::allocateHeapBitmap(SkBitmap* bitmap) {
     return allocateBitmap(bitmap, &Bitmap::allocateHeapBitmap);
 }

 sk_sp<Bitmap> Bitmap::allocateHeapBitmap(const SkImageInfo& info) {
     size_t size;
     if (!computeAllocationSize(info.minRowBytes(), info.height(), &size)) {
         LOG_ALWAYS_FATAL("trying to allocate too large bitmap");
         return nullptr;
     }
     return allocateHeapBitmap(size, info, info.minRowBytes());
 }

 sk_sp<Bitmap> Bitmap::allocateHeapBitmap(size_t size, const SkImageInfo& info, size_t rowBytes) {
     void* addr = calloc(size, 1);
     if (!addr) {
         return nullptr;
     }
     return sk_sp<Bitmap>(new Bitmap(addr, size, info, rowBytes));
 }

 void FreePixelRef(void* addr, void* context) {
     auto pixelRef = (SkPixelRef*)context;
     pixelRef->unref();
 }

 sk_sp<Bitmap> Bitmap::createFrom(const SkImageInfo& info, SkPixelRef& pixelRef) {
     pixelRef.ref();
     return sk_sp<Bitmap>(new Bitmap((void*)pixelRef.pixels(), (void*)&pixelRef, FreePixelRef, info,
                                     pixelRef.rowBytes()));
 }


 sk_sp<Bitmap> Bitmap::createFrom(sp<GraphicBuffer> graphicBuffer, SkColorType colorType,
                                  sk_sp<SkColorSpace> colorSpace, SkAlphaType alphaType,
                                  BitmapPalette palette) {
     SkImageInfo info = SkImageInfo::Make(graphicBuffer->getWidth(), graphicBuffer->getHeight(),
                                          colorType, alphaType, colorSpace);
     return sk_sp<Bitmap>(new Bitmap(graphicBuffer.get(), info, palette));
 }

 sk_sp<Bitmap> Bitmap::createFrom(const SkImageInfo& info, size_t rowBytes, int fd, void* addr,
                                  size_t size, bool readOnly) {
     if (info.colorType() == kUnknown_SkColorType) {
         LOG_ALWAYS_FATAL("unknown bitmap configuration");
         return nullptr;
     }

     if (!addr) {
         // Map existing ashmem region if not already mapped.
         int flags = readOnly ? (PROT_READ) : (PROT_READ | PROT_WRITE);
         size = ashmem_get_size_region(fd);
         addr = mmap(NULL, size, flags, MAP_SHARED, fd, 0);
         if (addr == MAP_FAILED) {
             return nullptr;
         }
     }

     sk_sp<Bitmap> bitmap(new Bitmap(addr, fd, size, info, rowBytes));
     if (readOnly) {
         bitmap->setImmutable();
     }
     return bitmap;
 }

 void Bitmap::setColorSpace(sk_sp<SkColorSpace> colorSpace) {
     mInfo = mInfo.makeColorSpace(std::move(colorSpace));
 }

 static SkImageInfo validateAlpha(const SkImageInfo& info) {
     // Need to validate the alpha type to filter against the color type
     // to prevent things like a non-opaque RGB565 bitmap
     SkAlphaType alphaType;
     LOG_ALWAYS_FATAL_IF(
             !SkColorTypeValidateAlphaType(info.colorType(), info.alphaType(), &alphaType),
             "Failed to validate alpha type!");
     return info.makeAlphaType(alphaType);
 }

 void Bitmap::reconfigure(const SkImageInfo& newInfo, size_t rowBytes) {
     mInfo = validateAlpha(newInfo);

     // Dirty hack is dirty
     // TODO: Figure something out here, Skia's current design makes this
     // really hard to work with. Skia really, really wants immutable objects,
     // but with the nested-ref-count hackery going on that's just not
     // feasible without going insane trying to figure it out
     this->android_only_reset(mInfo.width(), mInfo.height(), rowBytes);
 }

 Bitmap::Bitmap(void* address, size_t size, const SkImageInfo& info, size_t rowBytes)
         : SkPixelRef(info.width(), info.height(), address, rowBytes)
         , mInfo(validateAlpha(info))
         , mPixelStorageType(PixelStorageType::Heap) {
     mPixelStorage.heap.address = address;
     mPixelStorage.heap.size = size;
 }

 Bitmap::Bitmap(void* address, void* context, FreeFunc freeFunc, const SkImageInfo& info,
                size_t rowBytes)
         : SkPixelRef(info.width(), info.height(), address, rowBytes)
         , mInfo(validateAlpha(info))
         , mPixelStorageType(PixelStorageType::External) {
     mPixelStorage.external.address = address;
     mPixelStorage.external.context = context;
     mPixelStorage.external.freeFunc = freeFunc;
 }

 Bitmap::Bitmap(void* address, int fd, size_t mappedSize, const SkImageInfo& info, size_t rowBytes)
         : SkPixelRef(info.width(), info.height(), address, rowBytes)
         , mInfo(validateAlpha(info))
         , mPixelStorageType(PixelStorageType::Ashmem) {
     mPixelStorage.ashmem.address = address;
     mPixelStorage.ashmem.fd = fd;
     mPixelStorage.ashmem.size = mappedSize;
 }

 Bitmap::Bitmap(GraphicBuffer* buffer, const SkImageInfo& info, BitmapPalette palette)
         : SkPixelRef(info.width(), info.height(), nullptr,
                      bytesPerPixel(buffer->getPixelFormat()) * buffer->getStride())
         , mInfo(validateAlpha(info))
         , mPixelStorageType(PixelStorageType::Hardware)
         , mPalette(palette)
         , mPaletteGenerationId(getGenerationID()) {
     mPixelStorage.hardware.buffer = buffer;
     buffer->incStrong(buffer);
     setImmutable();  // HW bitmaps are always immutable
     mImage = SkImage::MakeFromAHardwareBuffer(reinterpret_cast<AHardwareBuffer*>(buffer),
                                               mInfo.alphaType(), mInfo.refColorSpace());
 }

 Bitmap::~Bitmap() {
     switch (mPixelStorageType) {
         case PixelStorageType::External:
             mPixelStorage.external.freeFunc(mPixelStorage.external.address,
                                             mPixelStorage.external.context);
             break;
         case PixelStorageType::Ashmem:
             munmap(mPixelStorage.ashmem.address, mPixelStorage.ashmem.size);
             close(mPixelStorage.ashmem.fd);
             break;
         case PixelStorageType::Heap:
             free(mPixelStorage.heap.address);
             mallopt(M_PURGE, 0);
             break;
         case PixelStorageType::Hardware:
             auto buffer = mPixelStorage.hardware.buffer;
             buffer->decStrong(buffer);
             mPixelStorage.hardware.buffer = nullptr;
             break;
     }
 }

 bool Bitmap::hasHardwareMipMap() const {
     return mHasHardwareMipMap;
 }

 void Bitmap::setHasHardwareMipMap(bool hasMipMap) {
     mHasHardwareMipMap = hasMipMap;
 }

 void* Bitmap::getStorage() const {
     switch (mPixelStorageType) {
         case PixelStorageType::External:
             return mPixelStorage.external.address;
         case PixelStorageType::Ashmem:
             return mPixelStorage.ashmem.address;
         case PixelStorageType::Heap:
             return mPixelStorage.heap.address;
         case PixelStorageType::Hardware:
             return nullptr;
     }
 }

 int Bitmap::getAshmemFd() const {
     switch (mPixelStorageType) {
         case PixelStorageType::Ashmem:
             return mPixelStorage.ashmem.fd;
         default:
             return -1;
     }
 }

 size_t Bitmap::getAllocationByteCount() const {
     switch (mPixelStorageType) {
         case PixelStorageType::Heap:
             return mPixelStorage.heap.size;
         case PixelStorageType::Ashmem:
             return mPixelStorage.ashmem.size;
         default:
             return rowBytes() * height();
     }
 }

 void Bitmap::reconfigure(const SkImageInfo& info) {
     reconfigure(info, info.minRowBytes());
 }

 void Bitmap::setAlphaType(SkAlphaType alphaType) {
     if (!SkColorTypeValidateAlphaType(info().colorType(), alphaType, &alphaType)) {
         return;
     }

     mInfo = mInfo.makeAlphaType(alphaType);
 }

 void Bitmap::getSkBitmap(SkBitmap* outBitmap) {
     if (isHardware()) {
         outBitmap->allocPixels(mInfo);
         uirenderer::renderthread::RenderProxy::copyHWBitmapInto(this, outBitmap);
         return;
     }
     outBitmap->setInfo(mInfo, rowBytes());
     outBitmap->setPixelRef(sk_ref_sp(this), 0, 0);
 }

 void Bitmap::getBounds(SkRect* bounds) const {
     SkASSERT(bounds);
     bounds->set(0, 0, SkIntToScalar(width()), SkIntToScalar(height()));
 }

 GraphicBuffer* Bitmap::graphicBuffer() {
     if (isHardware()) {
         return mPixelStorage.hardware.buffer;
     }
     return nullptr;
 }

 sk_sp<SkImage> Bitmap::makeImage() {
     sk_sp<SkImage> image = mImage;
     if (!image) {
         SkASSERT(!isHardware());
         SkBitmap skiaBitmap;
         skiaBitmap.setInfo(info(), rowBytes());
         skiaBitmap.setPixelRef(sk_ref_sp(this), 0, 0);
         // Note we don't cache in this case, because the raster image holds a pointer to this Bitmap
         // internally and ~Bitmap won't be invoked.
         // TODO: refactor Bitmap to not derive from SkPixelRef, which would allow caching here.
         image = SkMakeImageFromRasterBitmap(skiaBitmap, kNever_SkCopyPixelsMode);
     }
     return image;
 }

 class MinMaxAverage {
 public:
     void add(float sample) {
         if (mCount == 0) {
             mMin = sample;
             mMax = sample;
         } else {
             mMin = std::min(mMin, sample);
             mMax = std::max(mMax, sample);
         }
         mTotal += sample;
         mCount++;
     }

     float average() { return mTotal / mCount; }

     float min() { return mMin; }

     float max() { return mMax; }

     float delta() { return mMax - mMin; }

 private:
     float mMin = 0.0f;
     float mMax = 0.0f;
     float mTotal = 0.0f;
     int mCount = 0;
 };

 BitmapPalette Bitmap::computePalette(const SkImageInfo& info, const void* addr, size_t rowBytes) {
     ATRACE_CALL();

     SkPixmap pixmap{info, addr, rowBytes};

     // TODO: This calculation of converting to HSV & tracking min/max is probably overkill
     // Experiment with something simpler since we just want to figure out if it's "color-ful"
     // and then the average perceptual lightness.

     MinMaxAverage hue, saturation, value;
     int sampledCount = 0;

     // Sample a grid of 100 pixels to get an overall estimation of the colors in play
     const int x_step = std::max(1, pixmap.width() / 10);
     const int y_step = std::max(1, pixmap.height() / 10);
     for (int x = 0; x < pixmap.width(); x += x_step) {
         for (int y = 0; y < pixmap.height(); y += y_step) {
             SkColor color = pixmap.getColor(x, y);
             if (!info.isOpaque() && SkColorGetA(color) < 75) {
                 continue;
             }

             sampledCount++;
             float hsv[3];
             SkColorToHSV(color, hsv);
             hue.add(hsv[0]);
             saturation.add(hsv[1]);
             value.add(hsv[2]);
         }
     }

     // TODO: Tune the coverage threshold
     if (sampledCount < 5) {
         ALOGV("Not enough samples, only found %d for image sized %dx%d, format = %d, alpha = %d",
               sampledCount, info.width(), info.height(), (int)info.colorType(),
               (int)info.alphaType());
         return BitmapPalette::Unknown;
     }

     ALOGV("samples = %d, hue [min = %f, max = %f, avg = %f]; saturation [min = %f, max = %f, avg = "
           "%f]",
           sampledCount, hue.min(), hue.max(), hue.average(), saturation.min(), saturation.max(),
           saturation.average());

     if (hue.delta() <= 20 && saturation.delta() <= .1f) {
         if (value.average() >= .5f) {
             return BitmapPalette::Light;
         } else {
             return BitmapPalette::Dark;
         }
     }
     return BitmapPalette::Unknown;
 }

 }  // namespace android
	/*
	* Copyright (C) 2015 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 "Bitmap.h"

	#include "HardwareBitmapUploader.h"
	#include "Properties.h"
	#include "renderthread/RenderProxy.h"
	#include "utils/Color.h"
	#include <utils/Trace.h>

	#include <sys/mman.h>

	#include <cutils/ashmem.h>
	#include <log/log.h>

	#include <binder/IServiceManager.h>
	#include <private/gui/ComposerService.h>
	#include <ui/PixelFormat.h>

	#include <SkCanvas.h>
	#include <SkImagePriv.h>

	#include <SkHighContrastFilter.h>
	#include <limits>

	namespace android {

	// returns true if rowBytes * height can be represented by a positive int32_t value
	// and places that value in size.
	static bool computeAllocationSize(size_t rowBytes, int height, size_t* size) {
	return 0 <= height && height <= std::numeric_limits<size_t>::max() &&
	!__builtin_mul_overflow(rowBytes, (size_t)height, size) &&
	*size <= std::numeric_limits<int32_t>::max();
	}

	typedef sk_sp<Bitmap> (*AllocPixelRef)(size_t allocSize, const SkImageInfo& info, size_t rowBytes);

	static sk_sp<Bitmap> allocateBitmap(SkBitmap* bitmap, AllocPixelRef alloc) {
	const SkImageInfo& info = bitmap->info();
	if (info.colorType() == kUnknown_SkColorType) {
	LOG_ALWAYS_FATAL("unknown bitmap configuration");
	return nullptr;
	}

	size_t size;

	// we must respect the rowBytes value already set on the bitmap instead of
	// attempting to compute our own.
	const size_t rowBytes = bitmap->rowBytes();
	if (!computeAllocationSize(rowBytes, bitmap->height(), &size)) {
	return nullptr;
	}

	auto wrapper = alloc(size, info, rowBytes);
	if (wrapper) {
	wrapper->getSkBitmap(bitmap);
	}
	return wrapper;
	}

	sk_sp<Bitmap> Bitmap::allocateAshmemBitmap(SkBitmap* bitmap) {
	return allocateBitmap(bitmap, &Bitmap::allocateAshmemBitmap);
	}

	sk_sp<Bitmap> Bitmap::allocateAshmemBitmap(size_t size, const SkImageInfo& info, size_t rowBytes) {
	// Create new ashmem region with read/write priv
	int fd = ashmem_create_region("bitmap", size);
	if (fd < 0) {
	return nullptr;
	}

	void* addr = mmap(NULL, size, PROT_READ \| PROT_WRITE, MAP_SHARED, fd, 0);
	if (addr == MAP_FAILED) {
	close(fd);
	return nullptr;
	}

	if (ashmem_set_prot_region(fd, PROT_READ) < 0) {
	munmap(addr, size);
	close(fd);
	return nullptr;
	}
	return sk_sp<Bitmap>(new Bitmap(addr, fd, size, info, rowBytes));
	}

	sk_sp<Bitmap> Bitmap::allocateHardwareBitmap(const SkBitmap& bitmap) {
	return uirenderer::HardwareBitmapUploader::allocateHardwareBitmap(bitmap);
	}

	sk_sp<Bitmap> Bitmap::allocateHeapBitmap(SkBitmap* bitmap) {
	return allocateBitmap(bitmap, &Bitmap::allocateHeapBitmap);
	}

	sk_sp<Bitmap> Bitmap::allocateHeapBitmap(const SkImageInfo& info) {
	size_t size;
	if (!computeAllocationSize(info.minRowBytes(), info.height(), &size)) {
	LOG_ALWAYS_FATAL("trying to allocate too large bitmap");
	return nullptr;
	}
	return allocateHeapBitmap(size, info, info.minRowBytes());
	}

	sk_sp<Bitmap> Bitmap::allocateHeapBitmap(size_t size, const SkImageInfo& info, size_t rowBytes) {
	void* addr = calloc(size, 1);
	if (!addr) {
	return nullptr;
	}
	return sk_sp<Bitmap>(new Bitmap(addr, size, info, rowBytes));
	}

	void FreePixelRef(void* addr, void* context) {
	auto pixelRef = (SkPixelRef*)context;
	pixelRef->unref();
	}

	sk_sp<Bitmap> Bitmap::createFrom(const SkImageInfo& info, SkPixelRef& pixelRef) {
	pixelRef.ref();
	return sk_sp<Bitmap>(new Bitmap((void)pixelRef.pixels(), (void)&pixelRef, FreePixelRef, info,
	pixelRef.rowBytes()));
	}


	sk_sp<Bitmap> Bitmap::createFrom(sp<GraphicBuffer> graphicBuffer, SkColorType colorType,
	sk_sp<SkColorSpace> colorSpace, SkAlphaType alphaType,
	BitmapPalette palette) {
	SkImageInfo info = SkImageInfo::Make(graphicBuffer->getWidth(), graphicBuffer->getHeight(),
	colorType, alphaType, colorSpace);
	return sk_sp<Bitmap>(new Bitmap(graphicBuffer.get(), info, palette));
	}

	sk_sp<Bitmap> Bitmap::createFrom(const SkImageInfo& info, size_t rowBytes, int fd, void* addr,
	size_t size, bool readOnly) {
	if (info.colorType() == kUnknown_SkColorType) {
	LOG_ALWAYS_FATAL("unknown bitmap configuration");
	return nullptr;
	}

	if (!addr) {
	// Map existing ashmem region if not already mapped.
	int flags = readOnly ? (PROT_READ) : (PROT_READ \| PROT_WRITE);
	size = ashmem_get_size_region(fd);
	addr = mmap(NULL, size, flags, MAP_SHARED, fd, 0);
	if (addr == MAP_FAILED) {
	return nullptr;
	}
	}

	sk_sp<Bitmap> bitmap(new Bitmap(addr, fd, size, info, rowBytes));
	if (readOnly) {
	bitmap->setImmutable();
	}
	return bitmap;
	}

	void Bitmap::setColorSpace(sk_sp<SkColorSpace> colorSpace) {
	mInfo = mInfo.makeColorSpace(std::move(colorSpace));
	}

	static SkImageInfo validateAlpha(const SkImageInfo& info) {
	// Need to validate the alpha type to filter against the color type
	// to prevent things like a non-opaque RGB565 bitmap
	SkAlphaType alphaType;
	LOG_ALWAYS_FATAL_IF(
	!SkColorTypeValidateAlphaType(info.colorType(), info.alphaType(), &alphaType),
	"Failed to validate alpha type!");
	return info.makeAlphaType(alphaType);
	}

	void Bitmap::reconfigure(const SkImageInfo& newInfo, size_t rowBytes) {
	mInfo = validateAlpha(newInfo);

	// Dirty hack is dirty
	// TODO: Figure something out here, Skia's current design makes this
	// really hard to work with. Skia really, really wants immutable objects,
	// but with the nested-ref-count hackery going on that's just not
	// feasible without going insane trying to figure it out
	this->android_only_reset(mInfo.width(), mInfo.height(), rowBytes);
	}

	Bitmap::Bitmap(void* address, size_t size, const SkImageInfo& info, size_t rowBytes)
	: SkPixelRef(info.width(), info.height(), address, rowBytes)
	, mInfo(validateAlpha(info))
	, mPixelStorageType(PixelStorageType::Heap) {
	mPixelStorage.heap.address = address;
	mPixelStorage.heap.size = size;
	}

	Bitmap::Bitmap(void* address, void* context, FreeFunc freeFunc, const SkImageInfo& info,
	size_t rowBytes)
	: SkPixelRef(info.width(), info.height(), address, rowBytes)
	, mInfo(validateAlpha(info))
	, mPixelStorageType(PixelStorageType::External) {
	mPixelStorage.external.address = address;
	mPixelStorage.external.context = context;
	mPixelStorage.external.freeFunc = freeFunc;
	}

	Bitmap::Bitmap(void* address, int fd, size_t mappedSize, const SkImageInfo& info, size_t rowBytes)
	: SkPixelRef(info.width(), info.height(), address, rowBytes)
	, mInfo(validateAlpha(info))
	, mPixelStorageType(PixelStorageType::Ashmem) {
	mPixelStorage.ashmem.address = address;
	mPixelStorage.ashmem.fd = fd;
	mPixelStorage.ashmem.size = mappedSize;
	}

	Bitmap::Bitmap(GraphicBuffer* buffer, const SkImageInfo& info, BitmapPalette palette)
	: SkPixelRef(info.width(), info.height(), nullptr,
	bytesPerPixel(buffer->getPixelFormat()) * buffer->getStride())
	, mInfo(validateAlpha(info))
	, mPixelStorageType(PixelStorageType::Hardware)
	, mPalette(palette)
	, mPaletteGenerationId(getGenerationID()) {
	mPixelStorage.hardware.buffer = buffer;
	buffer->incStrong(buffer);
	setImmutable(); // HW bitmaps are always immutable
	mImage = SkImage::MakeFromAHardwareBuffer(reinterpret_cast<AHardwareBuffer*>(buffer),
	mInfo.alphaType(), mInfo.refColorSpace());
	}

	Bitmap::~Bitmap() {
	switch (mPixelStorageType) {
	case PixelStorageType::External:
	mPixelStorage.external.freeFunc(mPixelStorage.external.address,
	mPixelStorage.external.context);
	break;
	case PixelStorageType::Ashmem:
	munmap(mPixelStorage.ashmem.address, mPixelStorage.ashmem.size);
	close(mPixelStorage.ashmem.fd);
	break;
	case PixelStorageType::Heap:
	free(mPixelStorage.heap.address);
	mallopt(M_PURGE, 0);
	break;
	case PixelStorageType::Hardware:
	auto buffer = mPixelStorage.hardware.buffer;
	buffer->decStrong(buffer);
	mPixelStorage.hardware.buffer = nullptr;
	break;
	}
	}

	bool Bitmap::hasHardwareMipMap() const {
	return mHasHardwareMipMap;
	}

	void Bitmap::setHasHardwareMipMap(bool hasMipMap) {
	mHasHardwareMipMap = hasMipMap;
	}

	void* Bitmap::getStorage() const {
	switch (mPixelStorageType) {
	case PixelStorageType::External:
	return mPixelStorage.external.address;
	case PixelStorageType::Ashmem:
	return mPixelStorage.ashmem.address;
	case PixelStorageType::Heap:
	return mPixelStorage.heap.address;
	case PixelStorageType::Hardware:
	return nullptr;
	}
	}

	int Bitmap::getAshmemFd() const {
	switch (mPixelStorageType) {
	case PixelStorageType::Ashmem:
	return mPixelStorage.ashmem.fd;
	default:
	return -1;
	}
	}

	size_t Bitmap::getAllocationByteCount() const {
	switch (mPixelStorageType) {
	case PixelStorageType::Heap:
	return mPixelStorage.heap.size;
	case PixelStorageType::Ashmem:
	return mPixelStorage.ashmem.size;
	default:
	return rowBytes() * height();
	}
	}

	void Bitmap::reconfigure(const SkImageInfo& info) {
	reconfigure(info, info.minRowBytes());
	}

	void Bitmap::setAlphaType(SkAlphaType alphaType) {
	if (!SkColorTypeValidateAlphaType(info().colorType(), alphaType, &alphaType)) {
	return;
	}

	mInfo = mInfo.makeAlphaType(alphaType);
	}

	void Bitmap::getSkBitmap(SkBitmap* outBitmap) {
	if (isHardware()) {
	outBitmap->allocPixels(mInfo);
	uirenderer::renderthread::RenderProxy::copyHWBitmapInto(this, outBitmap);
	return;
	}
	outBitmap->setInfo(mInfo, rowBytes());
	outBitmap->setPixelRef(sk_ref_sp(this), 0, 0);
	}

	void Bitmap::getBounds(SkRect* bounds) const {
	SkASSERT(bounds);
	bounds->set(0, 0, SkIntToScalar(width()), SkIntToScalar(height()));
	}

	GraphicBuffer* Bitmap::graphicBuffer() {
	if (isHardware()) {
	return mPixelStorage.hardware.buffer;
	}
	return nullptr;
	}

	sk_sp<SkImage> Bitmap::makeImage() {
	sk_sp<SkImage> image = mImage;
	if (!image) {
	SkASSERT(!isHardware());
	SkBitmap skiaBitmap;
	skiaBitmap.setInfo(info(), rowBytes());
	skiaBitmap.setPixelRef(sk_ref_sp(this), 0, 0);
	// Note we don't cache in this case, because the raster image holds a pointer to this Bitmap
	// internally and ~Bitmap won't be invoked.
	// TODO: refactor Bitmap to not derive from SkPixelRef, which would allow caching here.
	image = SkMakeImageFromRasterBitmap(skiaBitmap, kNever_SkCopyPixelsMode);
	}
	return image;
	}

	class MinMaxAverage {
	public:
	void add(float sample) {
	if (mCount == 0) {
	mMin = sample;
	mMax = sample;
	} else {
	mMin = std::min(mMin, sample);
	mMax = std::max(mMax, sample);
	}
	mTotal += sample;
	mCount++;
	}

	float average() { return mTotal / mCount; }

	float min() { return mMin; }

	float max() { return mMax; }

	float delta() { return mMax - mMin; }

	private:
	float mMin = 0.0f;
	float mMax = 0.0f;
	float mTotal = 0.0f;
	int mCount = 0;
	};

	BitmapPalette Bitmap::computePalette(const SkImageInfo& info, const void* addr, size_t rowBytes) {
	ATRACE_CALL();

	SkPixmap pixmap{info, addr, rowBytes};

	// TODO: This calculation of converting to HSV & tracking min/max is probably overkill
	// Experiment with something simpler since we just want to figure out if it's "color-ful"
	// and then the average perceptual lightness.

	MinMaxAverage hue, saturation, value;
	int sampledCount = 0;

	// Sample a grid of 100 pixels to get an overall estimation of the colors in play
	const int x_step = std::max(1, pixmap.width() / 10);
	const int y_step = std::max(1, pixmap.height() / 10);
	for (int x = 0; x < pixmap.width(); x += x_step) {
	for (int y = 0; y < pixmap.height(); y += y_step) {
	SkColor color = pixmap.getColor(x, y);
	if (!info.isOpaque() && SkColorGetA(color) < 75) {
	continue;
	}

	sampledCount++;
	float hsv[3];
	SkColorToHSV(color, hsv);
	hue.add(hsv[0]);
	saturation.add(hsv[1]);
	value.add(hsv[2]);
	}
	}

	// TODO: Tune the coverage threshold
	if (sampledCount < 5) {
	ALOGV("Not enough samples, only found %d for image sized %dx%d, format = %d, alpha = %d",
	sampledCount, info.width(), info.height(), (int)info.colorType(),
	(int)info.alphaType());
	return BitmapPalette::Unknown;
	}

	ALOGV("samples = %d, hue [min = %f, max = %f, avg = %f]; saturation [min = %f, max = %f, avg = "
	"%f]",
	sampledCount, hue.min(), hue.max(), hue.average(), saturation.min(), saturation.max(),
	saturation.average());

	if (hue.delta() <= 20 && saturation.delta() <= .1f) {
	if (value.average() >= .5f) {
	return BitmapPalette::Light;
	} else {
	return BitmapPalette::Dark;
	}
	}
	return BitmapPalette::Unknown;
	}

	} // namespace android