libgui/source/gui/GuiImageAsync.cpp

/****************************************************************************
 * Copyright (C) 2015 Dimok
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/
#include <unistd.h>
#include <gui/GuiImageAsync.h>
#include <fs/FSUtils.h>

std::vector<GuiImageAsync *> GuiImageAsync::imageQueue;
CThread * GuiImageAsync::pThread = NULL;
CMutex * GuiImageAsync::pMutex = NULL;
uint32_t GuiImageAsync::threadRefCounter = 0;
bool GuiImageAsync::bExitRequested = false;
GuiImageAsync * GuiImageAsync::pInUse = NULL;

GuiImageAsync::GuiImageAsync(const uint8_t *imageBuffer, const uint32_t & imageBufferSize, GuiImageData * preloadImg)
    : GuiImage(preloadImg)
    , imgData(NULL)
    , imgBuffer(imageBuffer)
    , imgBufferSize(imageBufferSize) {
    threadInit();
    threadAddImage(this);
}

GuiImageAsync::GuiImageAsync(const std::string & file, GuiImageData * preloadImg)
    : GuiImage(preloadImg)
    , imgData(NULL)
    , filename(file)
    , imgBuffer(NULL)
    , imgBufferSize(0) {
    threadInit();
    threadAddImage(this);
}

GuiImageAsync::~GuiImageAsync() {
    threadRemoveImage(this);
    while(pInUse == this)
        OSSleepTicks(OSMicrosecondsToTicks(1000));

    if (imgData)
        delete imgData;

    //threadExit();
}

void GuiImageAsync::threadAddImage(GuiImageAsync *Image) {
    pMutex->lock();
    imageQueue.push_back(Image);
    pMutex->unlock();
    pThread->resumeThread();
}

void GuiImageAsync::threadRemoveImage(GuiImageAsync *image) {
    pMutex->lock();
    for(uint32_t i = 0; i < imageQueue.size(); ++i) {
        if(imageQueue[i] == image) {
            imageQueue.erase(imageQueue.begin() + i);
            break;
        }
    }
    pMutex->unlock();
}

void GuiImageAsync::clearQueue() {
    pMutex->lock();
    imageQueue.clear();
    pMutex->unlock();
}

void GuiImageAsync::guiImageAsyncThread(CThread *thread, void *arg) {
    while(!bExitRequested) {
        if(imageQueue.empty() && !bExitRequested)
            pThread->suspendThread();

        if(!imageQueue.empty() && !bExitRequested) {
            pMutex->lock();
            pInUse = imageQueue.front();
            imageQueue.erase(imageQueue.begin());
            pMutex->unlock();

            if (!pInUse)
                continue;


            if(pInUse->imgBuffer && pInUse->imgBufferSize) {
                pInUse->imgData = new GuiImageData(pInUse->imgBuffer, pInUse->imgBufferSize);
            } else {
                uint8_t *buffer = NULL;
                uint32_t bufferSize = 0;

                int32_t iResult = FSUtils::LoadFileToMem(pInUse->filename.c_str(), &buffer, &bufferSize);
                if(iResult > 0) {
                    pInUse->imgData = new GuiImageData(buffer, bufferSize, GX2_TEX_CLAMP_MODE_MIRROR);

                    //! free original image buffer which is converted to texture now and not needed anymore
                    free(buffer);
                }
            }

            if(pInUse->imgData) {
                if(pInUse->imgData->getTexture()) {
                    pInUse->width = pInUse->imgData->getWidth();
                    pInUse->height = pInUse->imgData->getHeight();
                    pInUse->imageData = pInUse->imgData;
                } else {
                    delete pInUse->imgData;
                    pInUse->imgData = NULL;
                }
            }
            pInUse->imageLoaded(pInUse);
            pInUse = NULL;
        }
    }
}

void GuiImageAsync::threadInit() {
    if (pThread == NULL) {
        bExitRequested = false;
        pMutex = new CMutex();
        pThread = CThread::create(GuiImageAsync::guiImageAsyncThread, NULL, CThread::eAttributeAffCore1 | CThread::eAttributePinnedAff, 10);
        pThread->resumeThread();
    }

    ++threadRefCounter;
}

void GuiImageAsync::threadExit() {
    if(threadRefCounter) {
        --threadRefCounter;
    }

    if(/*(threadRefCounter == 0) &&*/ (pThread != NULL)) {
        bExitRequested = true;
        delete pThread;
        delete pMutex;
        pThread = NULL;
        pMutex = NULL;
    }
}