michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <unistd.h>
michael@0: #include <errno.h>
michael@0: #include "AndroidDirectTexture.h"
michael@0: #include "nsRect.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: AndroidDirectTexture::AndroidDirectTexture(uint32_t width, uint32_t height, uint32_t usage,
michael@0:                                            gfxImageFormat format) :
michael@0:     mLock("AndroidDirectTexture.mLock")
michael@0:   , mNeedFlip(false)
michael@0:   , mWidth(width)
michael@0:   , mHeight(height)
michael@0:   , mFormat(format)
michael@0:   , mPendingReallocBuffer(nullptr)
michael@0: {
michael@0:   mFrontBuffer = new AndroidGraphicBuffer(width, height, usage, format);
michael@0:   mBackBuffer = new AndroidGraphicBuffer(width, height, usage, format);
michael@0: }
michael@0: 
michael@0: AndroidDirectTexture::~AndroidDirectTexture()
michael@0: {
michael@0:   if (mFrontBuffer) {
michael@0:     delete mFrontBuffer;
michael@0:     mFrontBuffer = nullptr;
michael@0:   }
michael@0: 
michael@0:   if (mBackBuffer) {
michael@0:     delete mBackBuffer;
michael@0:     mBackBuffer = nullptr;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: AndroidDirectTexture::ReallocPendingBuffer()
michael@0: {
michael@0:   // We may have reallocated while the current back buffer was being
michael@0:   // used as the front buffer. If we have such a reallocation pending
michael@0:   // and the current back buffer is the target buffer, do it now.
michael@0:   //
michael@0:   // It is assumed that mLock is already acquired
michael@0:   if (mPendingReallocBuffer == mBackBuffer) {
michael@0:     mBackBuffer->Reallocate(mWidth, mHeight, mFormat);
michael@0:     mPendingReallocBuffer = nullptr;
michael@0:   }
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Lock(uint32_t aUsage, unsigned char **bits)
michael@0: {
michael@0:   nsIntRect rect(0, 0, mWidth, mHeight);
michael@0:   return Lock(aUsage, rect, bits);
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Lock(uint32_t aUsage, const nsIntRect& aRect, unsigned char **bits)
michael@0: {
michael@0:   mLock.Lock();
michael@0:   ReallocPendingBuffer();
michael@0: 
michael@0:   int result;
michael@0:   while ((result = mBackBuffer->Lock(aUsage, aRect, bits)) == -EBUSY) {
michael@0:     usleep(1000); // 1ms
michael@0:   }
michael@0: 
michael@0:   return result == 0;
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Unlock(bool aFlip)
michael@0: {
michael@0:   if (aFlip) {
michael@0:     mNeedFlip = true;
michael@0:   }
michael@0: 
michael@0:   bool result = mBackBuffer->Unlock();
michael@0:   mLock.Unlock();
michael@0: 
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Reallocate(uint32_t aWidth, uint32_t aHeight) {
michael@0:   return Reallocate(aWidth, aHeight, mFormat);
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Reallocate(uint32_t aWidth, uint32_t aHeight, gfxImageFormat aFormat)
michael@0: {
michael@0:   MutexAutoLock lock(mLock);
michael@0: 
michael@0:   // We only reallocate the current back buffer. The front buffer is likely
michael@0:   // in use, so we'll reallocate it on the first Lock() after it is rotated
michael@0:   // to the back.
michael@0:   bool result = mBackBuffer->Reallocate(aWidth, aHeight, aFormat);
michael@0:   if (result) {
michael@0:     mPendingReallocBuffer = mFrontBuffer;
michael@0: 
michael@0:     mWidth = aWidth;
michael@0:     mHeight = aHeight;
michael@0:   }
michael@0: 
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: bool
michael@0: AndroidDirectTexture::Bind()
michael@0: {
michael@0:   MutexAutoLock lock(mLock);
michael@0: 
michael@0:   if (mNeedFlip) {
michael@0:     AndroidGraphicBuffer* tmp = mBackBuffer;
michael@0:     mBackBuffer = mFrontBuffer;
michael@0:     mFrontBuffer = tmp;
michael@0:     mNeedFlip = false;
michael@0:   }
michael@0: 
michael@0:   return mFrontBuffer->Bind();
michael@0: }
michael@0: 
michael@0: } /* mozilla */