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sw_engine renderer: fix the invalid memory access in the corner case.

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Tasks can be disposed while the renderer referencing it.
Now, we can delete the tasks with lazy approach by introducing some tags.

@Issue: https://github.com/Samsung/thorvg/issues/995
This commit is contained in:
Hermet Park 2021-11-09 16:50:20 +09:00 • committed by Hermet Park
parent 14c1562b36
commit 097e10fea4
1 changed files with 22 additions and 3 deletions
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25
src/lib/sw_engine/tvgSwRenderer.cpp
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@ -41,6 +41,8 @@ struct SwTask : Task
Array<RenderData> clips;
uint32_t opacity;
SwBBox bbox = {{0, 0}, {0, 0}}; //Whole Rendering Region
bool pushed = false; //Pushed into task list?
bool disposed = false; //Disposed task?
RenderRegion bounds() const
{
@ -249,7 +251,14 @@ SwRenderer::~SwRenderer()
bool SwRenderer::clear()
{
for (auto task = tasks.data; task < (tasks.data + tasks.count); ++task) (*task)->done();
for (auto task = tasks.data; task < (tasks.data + tasks.count); ++task) {
if ((*task)->disposed) {
delete(*task);
} else {
(*task)->done();
(*task)->pushed = false;
}
}
tasks.clear();
if (!sharedMpool) mpoolClear(mpool);
@ -328,7 +337,11 @@ bool SwRenderer::postRender()
rasterUnpremultiply(surface);
}
for (auto task = tasks.data; task < (tasks.data + tasks.count); ++task) {
(*task)->pushed = false;
}
tasks.clear();
clearCompositors();
return true;
}
@ -543,7 +556,9 @@ bool SwRenderer::dispose(RenderData data)
if (!task) return true;
task->done();
task->dispose();
delete(task);
if (task->pushed) task->disposed = true;
else delete(task);
return true;
}
@ -582,7 +597,11 @@ void* SwRenderer::prepareCommon(SwTask* task, const RenderTransform* transform,
task->bbox.max.x = min(static_cast<SwCoord>(surface->w), static_cast<SwCoord>(vport.x + vport.w));
task->bbox.max.y = min(static_cast<SwCoord>(surface->h), static_cast<SwCoord>(vport.y + vport.h));
tasks.push(task);
if (!task->pushed) {
task->pushed = true;
tasks.push(task);
}
TaskScheduler::request(task);
return task;