We want to cache the bitmap of a graph and output it as an image. This is done for performance reasons for a ScrollWheel.
To do this, we insert the graph into a CachableContainer.
We create a separate dynamic bitmap for each CachableGraphContainer.
To update the graph, we call drawToDynamicBitmap(...).
The image should draw the data of the dynamic bitmap.
But there the Assert Error occurs.
Of course, we use an external RAM and set the cache manually.
We use a cache size of 1296000 bytes.
void CacheGraph::initialize(){
// ...
if(getWidgethBitmapID() == BITMAP_INVALID){
uint16_t w = getWidth();
uint16_t h = getHeight();
BitmapId bitmapID = Bitmap::dynamicBitmapCreate(w, h, Bitmap::RGB565);
DBGAIF("Dynamic Bitmap created: %d", bitmapID);
setWidgetBitmapID(bitmapID);
}
// ...
}
void CacheGraph::updateContent(void){
// ...
this->invalidate();
if((lastStateID != curStateID)
&& (getWidgethBitmapID() != BITMAP_INVALID)){
//content has changed!
graphContainer.updateContent();
graphContainer.drawToDynamicBitmap(getWidgethBitmapID());
lastStateID = curStateID;
}
}#define BITMAP_BUFFER_SIZE (480*135)*2*10
uint16_t XRAM bitmapBuffer[BITMAP_BUFFER_SIZE];
//...
Bitmap::setCache(bitmapBuffer, BITMAP_BUFFER_SIZE, CURRENT_VALUE_MAX_COUNT);
