usbloadergx/source/libwiigui/gui_image_async.cpp

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/****************************************************************************
* libwiigui
*
* Tantric 2009
*
* gui_imagea_sync.cpp
*
* GUI class definitions
***************************************************************************/
#include "gui.h"
//#include <string.h>
#include <unistd.h>
#include "gui_image_async.h"
static mutex_t debugLock = LWP_MUTEX_NULL;
void debug(int Line, const char* Format, ...) {
if (debugLock==0) LWP_MutexInit(&debugLock, false);
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LWP_MutexLock(debugLock);
FILE *fp = fopen("SD:/debug.txt", "a");
if (fp) {
char theTime[10];
time_t rawtime = time(0); //this fixes code dump caused by the clock
struct tm * timeinfo = localtime (&rawtime);
strftime(theTime, sizeof(theTime), "%H:%M:%S", timeinfo);
char format[10+strlen(Format)+strlen(theTime)];
sprintf(format, "%s %i - %s\n", theTime, Line, Format);
va_list va;
va_start(va, Format);
vfprintf(fp, format, va);
va_end(va);
fclose(fp);
}
LWP_MutexUnlock(debugLock);
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}
//#define DEBUG(format, ...) debug(__LINE__, format, ##__VA_ARGS__)
#define DEBUG(format, ...)
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static void *memdup(const void* src, size_t len) {
void *dst = malloc(len);
if (dst) memcpy(dst, src, len);
return dst;
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}
static std::vector<GuiImageAsync *> List;
static u32 ThreadCount = 0;
static lwp_t Thread = LWP_THREAD_NULL;
static mutex_t ListLock = LWP_MUTEX_NULL;
static mutex_t InUseLock = LWP_MUTEX_NULL;
static GuiImageAsync *InUse = NULL;
static bool Quit = false;
static bool CanSleep = true;
void *GuiImageAsyncThread(void *arg) {
while (!Quit) {
LWP_MutexLock(ListLock);
if (List.size()) {
LWP_MutexLock(InUseLock);
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InUse = List.front();
List.erase(List.begin());
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LWP_MutexUnlock(ListLock);
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if (InUse) {
GuiImageData *data = InUse->callback(InUse->arg);
InUse->loadet_imgdata = data;
if (InUse->loadet_imgdata && InUse->loadet_imgdata->GetImage()) {
// InUse->SetImage(InUse->loadet_imgdata); can<61>t use here. There can occur a deadlock
// Sets the image directly without lock. This is not fine, but it prevents a deadlock
InUse->image = InUse->loadet_imgdata->GetImage();
InUse->width = InUse->loadet_imgdata->GetWidth();
InUse->height = InUse->loadet_imgdata->GetHeight();
}
}
InUse = NULL;
LWP_MutexUnlock(InUseLock);
} else {
LWP_MutexUnlock(ListLock);
if (!Quit && CanSleep)
LWP_SuspendThread(Thread);
}
CanSleep = true;
}
Quit = false;
return NULL;
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}
static u32 GuiImageAsyncThreadInit() {
if (0 == ThreadCount++) {
CanSleep = false;
LWP_MutexInit(&ListLock, false);
LWP_MutexInit(&InUseLock, false);
LWP_CreateThread(&Thread, GuiImageAsyncThread, NULL, NULL, 0, 75);
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// while(!CanSleep)
// usleep(20);
}
return ThreadCount;
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}
static u32 GuiImageAsyncThreadExit() {
if (--ThreadCount == 0) {
Quit = true;
LWP_ResumeThread(Thread);
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// while(Quit)
// usleep(20);
LWP_JoinThread(Thread, NULL);
LWP_MutexDestroy(ListLock);
LWP_MutexDestroy(InUseLock);
Thread = LWP_THREAD_NULL;
ListLock = LWP_MUTEX_NULL;
InUseLock = LWP_MUTEX_NULL;
}
return ThreadCount;
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}
static void GuiImageAsyncThread_AddImage(GuiImageAsync* Image) {
LWP_MutexLock(ListLock);
List.push_back(Image);
LWP_MutexUnlock(ListLock);
CanSleep = false;
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// if(LWP_ThreadIsSuspended(Thread))
LWP_ResumeThread(Thread);
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}
static void GuiImageAsyncThread_RemoveImage(GuiImageAsync* Image) {
LWP_MutexLock(ListLock);
for (std::vector<GuiImageAsync *>::iterator iter=List.begin(); iter != List.end(); iter++) {
if (*iter == Image) {
List.erase(iter);
LWP_MutexUnlock(ListLock);
return;
}
}
if (InUse == Image) {
LWP_MutexLock(InUseLock);
LWP_MutexUnlock(InUseLock);
}
LWP_MutexUnlock(ListLock);
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}
/**
* Constructor for the GuiImageAsync class.
*/
GuiImageData *StdImageLoaderCallback(void *arg) {
return new GuiImageData((char*)arg, NULL);
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}
GuiImageAsync::GuiImageAsync(const char *Filename, GuiImageData * PreloadImg) :
GuiImage(PreloadImg),
loadet_imgdata(NULL),
callback(StdImageLoaderCallback),
arg(strdup(Filename)) {
GuiImageAsyncThreadInit();
GuiImageAsyncThread_AddImage(this);
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}
GuiImageAsync::GuiImageAsync(ImageLoaderCallback Callback, void *Arg, int ArgLen, GuiImageData * PreloadImg) :
GuiImage(PreloadImg),
loadet_imgdata(NULL),
callback(Callback),
arg(memdup(Arg, ArgLen)) {
DEBUG("Constructor %p", this);
GuiImageAsyncThreadInit();
GuiImageAsyncThread_AddImage(this);
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}
GuiImageAsync::~GuiImageAsync() {
GuiImageAsyncThread_RemoveImage(this);
GuiImageAsyncThreadExit();
DEBUG("Deconstructor %p (loadet_imgdata=%p)", this, loadet_imgdata);
if (loadet_imgdata) delete loadet_imgdata;
if (arg) free(arg);
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}