DM: make GPU tasks multithreaded again. Big refactor.

dm/DMTask.cpp

 #include "DMTask.h"
-
 #include "DMTaskRunner.h"
-#include "DMUtil.h"
-#include "SkBitmap.h"
-#include "SkCommandLineFlags.h"
 
 namespace DM {
 
 Task::Task(Reporter* reporter, TaskRunner* taskRunner)
-    : fReporter(reporter), fTaskRunner(taskRunner), fDepth(0) {
+    : fReporter(reporter)
+    , fTaskRunner(taskRunner)
+    , fDepth(0) {
     fReporter->start();
 }
 
 Task::Task(const Task& parent)
-    : INHERITED(parent)
-    , fReporter(parent.fReporter)
+    : fReporter(parent.fReporter)
     , fTaskRunner(parent.fTaskRunner)
-    , fDepth(parent.depth()+1) {
+    , fDepth(parent.depth() + 1) {
     fReporter->start();
 }
 
-Task::~Task() {}
-
-void Task::run() {
-    if (!this->shouldSkip()) {
-        this->draw();
-    }
-    fReporter->finish(this->name());
-    delete this;
-}
-
-void Task::spawnChild(Task* task) {
-    if (!task->usesGpu()) {
-        fTaskRunner->add(task);
-    } else {
-        SkDEBUGFAIL("Sorry, we can't spawn GPU tasks. :(  See comment in TaskRunner::wait().");
-    }
-}
-
 void Task::fail(const char* msg) {
     SkString failure(this->name());
     if (msg) {
         failure.appendf(": %s", msg);
     }
     fReporter->fail(failure);
 }
 
-GrContextFactory* Task::getGrContextFactory() const {
-    return fTaskRunner->getGrContextFactory();
+void Task::finish() {
+    fReporter->finish(this->name());
 }
 
+void Task::spawnChild(CpuTask* task) {
+    fTaskRunner->add(task);
+}
+
+CpuTask::CpuTask(Reporter* reporter, TaskRunner* taskRunner) : Task(reporter, taskRunner) {}
+CpuTask::CpuTask(const Task& parent) : Task(parent) {}
+
+void CpuTask::run() {
+    if (!this->shouldSkip()) {
+        this->draw();
+    }
+    this->finish();
+    SkDELETE(this);
+}
+
+GpuTask::GpuTask(Reporter* reporter, TaskRunner* taskRunner) : Task(reporter, taskRunner) {}
+
+void GpuTask::run(GrContextFactory& factory) {
+    if (!this->shouldSkip()) {
+        this->draw(&factory);
+    }
+    this->finish();
+    SkDELETE(this);
+}
+
+
+
 }  // namespace DM