grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 565 insertions, 0 deletions

diff --git a/src/views/SkEvent.cpp b/src/views/SkEvent.cpp
new file mode 100644
index 0000000000..67549b48b5
--- /dev/null
+++ b/src/views/SkEvent.cpp
@@ -0,0 +1,565 @@
+/* libs/graphics/views/SkEvent.cpp
+**
+** Copyright 2006, 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 "SkEvent.h"
+
+void SkEvent::initialize(const char* type, size_t typeLen) {
+    fType = NULL;
+    setType(type, typeLen);
+    f32 = 0;
+#ifdef SK_DEBUG
+    fTargetID = 0;
+    fTime = 0;
+    fNextEvent = NULL;
+#endif
+    SkDEBUGCODE(fDebugTrace = false;)
+}
+
+SkEvent::SkEvent()
+{
+    initialize("", 0);
+}
+
+SkEvent::SkEvent(const SkEvent& src)
+{
+    *this = src;
+    if (((size_t) fType & 1) == 0)
+        setType(src.fType);
+}
+
+SkEvent::SkEvent(const SkString& type)
+{
+    initialize(type.c_str(), type.size());
+}
+
+SkEvent::SkEvent(const char type[])
+{
+    SkASSERT(type);
+    initialize(type, strlen(type));
+}
+
+SkEvent::~SkEvent()
+{
+    if (((size_t) fType & 1) == 0)
+        sk_free((void*) fType);
+}
+
+static size_t makeCharArray(char* buffer, size_t compact)
+{
+    size_t bits = (size_t) compact >> 1;
+    memcpy(buffer, &bits, sizeof(compact));
+    buffer[sizeof(compact)] = 0;
+    return strlen(buffer);
+}
+
+#if 0
+const char* SkEvent::getType() const 
+{ 
+    if ((size_t) fType & 1) {   // not a pointer
+        char chars[sizeof(size_t) + 1];
+        size_t len = makeCharArray(chars, (size_t) fType);
+        fType = (char*) sk_malloc_throw(len);
+        SkASSERT(((size_t) fType & 1) == 0);
+        memcpy(fType, chars, len);
+    }
+    return fType; 
+}
+#endif
+
+void SkEvent::getType(SkString* str) const 
+{ 
+    if (str) 
+    {
+        if ((size_t) fType & 1) // not a pointer
+        {
+            char chars[sizeof(size_t) + 1];
+            size_t len = makeCharArray(chars, (size_t) fType);
+            str->set(chars, len);
+        }
+        else
+            str->set(fType);
+    }
+}
+
+bool SkEvent::isType(const SkString& str) const 
+{
+    return this->isType(str.c_str(), str.size()); 
+}
+
+bool SkEvent::isType(const char type[], size_t typeLen) const 
+{ 
+    if (typeLen == 0)
+        typeLen = strlen(type);
+    if ((size_t) fType & 1) {   // not a pointer
+        char chars[sizeof(size_t) + 1];
+        size_t len = makeCharArray(chars, (size_t) fType);
+        return len == typeLen && strncmp(chars, type, typeLen) == 0;
+    }
+    return strncmp(fType, type, typeLen) == 0 && fType[typeLen] == 0; 
+}
+
+void SkEvent::setType(const char type[], size_t typeLen)
+{
+    if (typeLen == 0)
+        typeLen = strlen(type);
+    if (typeLen <= sizeof(fType)) {
+        size_t slot = 0;
+        memcpy(&slot, type, typeLen);
+        if (slot << 1 >> 1 != slot)
+            goto useCharStar;
+        slot <<= 1;
+        slot |= 1;
+        fType = (char*) slot;
+    } else {
+useCharStar:
+        fType = (char*) sk_malloc_throw(typeLen + 1);
+        SkASSERT(((size_t) fType & 1) == 0);
+        memcpy(fType, type, typeLen);
+        fType[typeLen] = 0;
+    }
+}
+
+void SkEvent::setType(const SkString& type)
+{
+    setType(type.c_str());
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+#include "SkParse.h"
+
+void SkEvent::inflate(const SkDOM& dom, const SkDOM::Node* node)
+{
+    const char* name = dom.findAttr(node, "type");
+    if (name)
+        this->setType(name);
+
+    const char* value;
+    if ((value = dom.findAttr(node, "fast32")) != NULL)
+    {
+        int32_t n;
+        if (SkParse::FindS32(value, &n))
+            this->setFast32(n);
+    }
+
+    for (node = dom.getFirstChild(node); node; node = dom.getNextSibling(node))
+    {
+        if (strcmp(dom.getName(node), "data"))
+        {
+            SkDEBUGCODE(SkDebugf("SkEvent::inflate unrecognized subelement <%s>\n", dom.getName(node));)
+            continue;
+        }
+
+        name = dom.findAttr(node, "name");
+        if (name == NULL)
+        {
+            SkDEBUGCODE(SkDebugf("SkEvent::inflate missing required \"name\" attribute in <data> subelement\n");)
+            continue;
+        }
+
+        if ((value = dom.findAttr(node, "s32")) != NULL)
+        {
+            int32_t n;
+            if (SkParse::FindS32(value, &n))
+                this->setS32(name, n);
+        }
+        else if ((value = dom.findAttr(node, "scalar")) != NULL)
+        {
+            SkScalar x;
+            if (SkParse::FindScalar(value, &x))
+                this->setScalar(name, x);
+        }
+        else if ((value = dom.findAttr(node, "string")) != NULL)
+            this->setString(name, value);
+#ifdef SK_DEBUG
+        else
+        {
+            SkDebugf("SkEvent::inflate <data name=\"%s\"> subelement missing required type attribute [S32 | scalar | string]\n", name);
+        }
+#endif
+    }
+}
+
+#ifdef SK_DEBUG
+
+    #ifndef SkScalarToFloat
+        #define SkScalarToFloat(x)  ((x) / 65536.f)
+    #endif
+
+    void SkEvent::dump(const char title[])
+    {
+        if (title)
+            SkDebugf("%s ", title);
+            
+        SkString    etype;
+        this->getType(&etype);
+        SkDebugf("event<%s> fast32=%d", etype.c_str(), this->getFast32());
+
+        const SkMetaData&   md = this->getMetaData();
+        SkMetaData::Iter    iter(md);
+        SkMetaData::Type    mtype;
+        int                 count;
+        const char*         name;
+        
+        while ((name = iter.next(&mtype, &count)) != NULL)
+        {
+            SkASSERT(count > 0);
+
+            SkDebugf(" <%s>=", name);
+            switch (mtype) {
+            case SkMetaData::kS32_Type:     // vector version???
+                {
+                    int32_t value;
+                    md.findS32(name, &value);
+                    SkDebugf("%d ", value);
+                }
+                break;
+            case SkMetaData::kScalar_Type:
+                {
+                    const SkScalar* values = md.findScalars(name, &count, NULL);
+                    SkDebugf("%f", SkScalarToFloat(values[0]));
+                    for (int i = 1; i < count; i++)
+                        SkDebugf(", %f", SkScalarToFloat(values[i]));
+                    SkDebugf(" ");
+                }
+                break;
+            case SkMetaData::kString_Type:
+                {
+                    const char* value = md.findString(name);
+                    SkASSERT(value);
+                    SkDebugf("<%s> ", value);
+                }
+                break;
+            case SkMetaData::kPtr_Type:     // vector version???
+                {
+                    void*   value;
+                    md.findPtr(name, &value);
+                    SkDebugf("%p ", value);
+                }
+                break;
+            case SkMetaData::kBool_Type:    // vector version???
+                {
+                    bool    value;
+                    md.findBool(name, &value);
+                    SkDebugf("%s ", value ? "true" : "false");
+                }
+                break;
+            default:
+                SkASSERT(!"unknown metadata type returned from iterator");
+                break;
+            }
+        }
+        SkDebugf("\n");
+    }
+#endif
+
+///////////////////////////////////////////////////////////////////////////////////////
+
+#ifdef SK_DEBUG
+// #define SK_TRACE_EVENTSx
+#endif
+
+#ifdef SK_TRACE_EVENTS
+    static void event_log(const char s[])
+    {
+        SkDEBUGF(("%s\n", s));
+    }
+
+    #define EVENT_LOG(s)        event_log(s)
+    #define EVENT_LOGN(s, n)    do { SkString str(s); str.append(" "); str.appendS32(n); event_log(str.c_str()); } while (0)
+#else
+    #define EVENT_LOG(s)
+    #define EVENT_LOGN(s, n)
+#endif
+
+#include "SkGlobals.h"
+#include "SkThread.h"
+#include "SkTime.h"
+
+#define SK_Event_GlobalsTag     SkSetFourByteTag('e', 'v', 'n', 't')
+
+class SkEvent_Globals : public SkGlobals::Rec {
+public:
+    SkMutex     fEventMutex;
+    SkEvent*    fEventQHead, *fEventQTail;
+    SkEvent*    fDelayQHead;
+    SkDEBUGCODE(int fEventCounter;)
+};
+
+static SkGlobals::Rec* create_globals()
+{
+    SkEvent_Globals* rec = new SkEvent_Globals;
+    rec->fEventQHead = NULL;
+    rec->fEventQTail = NULL;
+    rec->fDelayQHead = NULL;
+    SkDEBUGCODE(rec->fEventCounter = 0;)
+    return rec;
+}
+
+bool SkEvent::Post(SkEvent* evt, SkEventSinkID sinkID, SkMSec delay)
+{
+    if (delay)
+        return SkEvent::PostTime(evt, sinkID, SkTime::GetMSecs() + delay);
+
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+
+    evt->fTargetID = sinkID;
+
+#ifdef SK_TRACE_EVENTS
+    {
+        SkString    str("SkEvent::Post(");
+        str.append(evt->getType());
+        str.append(", 0x");
+        str.appendHex(sinkID);
+        str.append(", ");
+        str.appendS32(delay);
+        str.append(")");
+        event_log(str.c_str());
+    }
+#endif
+
+    globals.fEventMutex.acquire();
+    bool wasEmpty = SkEvent::Enqueue(evt);
+    globals.fEventMutex.release();
+
+    // call outside of us holding the mutex
+    if (wasEmpty)
+        SkEvent::SignalNonEmptyQueue();
+    return true;
+}
+
+#if defined(SK_SIMULATE_FAILED_MALLOC) && defined(SK_FIND_MEMORY_LEAKS)
+SkMSec gMaxDrawTime;
+#endif
+
+bool SkEvent::PostTime(SkEvent* evt, SkEventSinkID sinkID, SkMSec time)
+{
+#if defined(SK_SIMULATE_FAILED_MALLOC) && defined(SK_FIND_MEMORY_LEAKS)
+    gMaxDrawTime = time;
+#endif
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+
+    evt->fTargetID = sinkID;
+
+#ifdef SK_TRACE_EVENTS
+    {
+        SkString    str("SkEvent::Post(");
+        str.append(evt->getType());
+        str.append(", 0x");
+        str.appendHex(sinkID);
+        str.append(", ");
+        str.appendS32(time);
+        str.append(")");
+        event_log(str.c_str());
+    }
+#endif
+
+    globals.fEventMutex.acquire();
+    SkMSec queueDelay = SkEvent::EnqueueTime(evt, time);
+    globals.fEventMutex.release();
+
+    // call outside of us holding the mutex
+    if ((int32_t)queueDelay != ~0)
+        SkEvent::SignalQueueTimer(queueDelay);
+    return true;
+}
+
+bool SkEvent::Enqueue(SkEvent* evt)
+{
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+    //  gEventMutex acquired by caller
+
+    SkASSERT(evt);
+
+    bool wasEmpty = globals.fEventQHead == NULL;
+
+    if (globals.fEventQTail)
+        globals.fEventQTail->fNextEvent = evt;
+    globals.fEventQTail = evt;
+    if (globals.fEventQHead == NULL)
+        globals.fEventQHead = evt;
+    evt->fNextEvent = NULL;
+
+    SkDEBUGCODE(++globals.fEventCounter);
+//  SkDebugf("Enqueue: count=%d\n", gEventCounter);
+
+    return wasEmpty;
+}
+
+SkEvent* SkEvent::Dequeue(SkEventSinkID* sinkID)
+{
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+    globals.fEventMutex.acquire();
+
+    SkEvent* evt = globals.fEventQHead;
+    if (evt)
+    {
+        SkDEBUGCODE(--globals.fEventCounter);
+
+        if (sinkID)
+            *sinkID = evt->fTargetID;
+
+        globals.fEventQHead = evt->fNextEvent;
+        if (globals.fEventQHead == NULL)
+            globals.fEventQTail = NULL;
+    }
+    globals.fEventMutex.release();
+
+//  SkDebugf("Dequeue: count=%d\n", gEventCounter);
+
+    return evt;
+}
+
+bool SkEvent::QHasEvents()
+{
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+
+    // this is not thread accurate, need a semaphore for that
+    return globals.fEventQHead != NULL;
+}
+
+#ifdef SK_TRACE_EVENTS
+    static int gDelayDepth;
+#endif
+
+SkMSec SkEvent::EnqueueTime(SkEvent* evt, SkMSec time)
+{
+#ifdef SK_TRACE_EVENTS
+    SkDebugf("enqueue-delay %s %d (%d)", evt->getType(), time, gDelayDepth);
+    const char* idStr = evt->findString("id");
+    if (idStr)
+        SkDebugf(" (%s)", idStr);
+    SkDebugf("\n");
+    ++gDelayDepth;
+#endif
+
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+    //  gEventMutex acquired by caller
+
+    SkEvent* curr = globals.fDelayQHead;
+    SkEvent* prev = NULL;
+
+    while (curr)
+    {
+        if (SkMSec_LT(time, curr->fTime))
+            break;
+        prev = curr;
+        curr = curr->fNextEvent;
+    }
+
+    evt->fTime = time;
+    evt->fNextEvent = curr;
+    if (prev == NULL)
+        globals.fDelayQHead = evt;
+    else
+        prev->fNextEvent = evt;
+
+    SkMSec delay = globals.fDelayQHead->fTime - SkTime::GetMSecs();
+    if ((int32_t)delay <= 0)
+        delay = 1;
+    return delay;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+#include "SkEventSink.h"
+
+bool SkEvent::ProcessEvent()
+{
+    SkEventSinkID   sinkID;
+    SkEvent*        evt = SkEvent::Dequeue(&sinkID);
+    SkAutoTDelete<SkEvent>  autoDelete(evt);
+    bool            again = false;
+
+    EVENT_LOGN("ProcessEvent", (int32_t)evt);
+
+    if (evt)
+    {
+        (void)SkEventSink::DoEvent(*evt, sinkID);
+        again = SkEvent::QHasEvents();
+    }
+    return again;
+}
+
+void SkEvent::ServiceQueueTimer()
+{
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+
+    globals.fEventMutex.acquire();
+
+    bool        wasEmpty = false;
+    SkMSec      now = SkTime::GetMSecs();
+    SkEvent*    evt = globals.fDelayQHead;
+
+    while (evt)
+    {
+        if (SkMSec_LT(now, evt->fTime))
+            break;
+
+#ifdef SK_TRACE_EVENTS
+        --gDelayDepth;
+        SkDebugf("dequeue-delay %s (%d)", evt->getType(), gDelayDepth);
+        const char* idStr = evt->findString("id");
+        if (idStr)
+            SkDebugf(" (%s)", idStr);
+        SkDebugf("\n");
+#endif
+
+        SkEvent* next = evt->fNextEvent;
+        if (SkEvent::Enqueue(evt))
+            wasEmpty = true;
+        evt = next;
+    }
+    globals.fDelayQHead = evt;
+
+    SkMSec time = evt ? evt->fTime - now : 0;
+
+    globals.fEventMutex.release();
+
+    if (wasEmpty)
+        SkEvent::SignalNonEmptyQueue();
+
+    SkEvent::SignalQueueTimer(time);
+}
+
+////////////////////////////////////////////////////////////////
+
+void SkEvent::Init()
+{
+}
+
+void SkEvent::Term()
+{
+    SkEvent_Globals& globals = *(SkEvent_Globals*)SkGlobals::Find(SK_Event_GlobalsTag, create_globals);
+
+    SkEvent* evt = globals.fEventQHead;
+    while (evt)
+    {
+        SkEvent* next = evt->fNextEvent;
+        delete evt;
+        evt = next;
+    }
+
+    evt = globals.fDelayQHead;
+    while (evt)
+    {
+        SkEvent* next = evt->fNextEvent;
+        delete evt;
+        evt = next;
+    }
+}
+