Problems with merging multiple QPixmaps - c++

Question

I'm developing a painter-like application and i want my application to have multiple layers for different drawings. For that purpose i have an array, that contains QPixmaps with transparent background and i have a function that merges two QPixmaps (draws one on another). It's done like so:
void MeasuresWidget::MergePixmaps(QPixmap source, QPixmap target)//draw source on target
{
QPainter painter(&target);
painter.drawPixmap(target.rect(),source,source.rect());
painter.end();
imageLabel->setPixmap(target);
}
I'm for 100% sure that array of pixmaps (AllLayers array) contains all the drawing i want. Now i want to consistently merge all the drawings with the original image. Here's how i'm trying to achieve this:
void MeasuresWidget::on_actionAct_triggered()
{
ForMerging = &OriginalImage;
for(int i=0;i<5;i++)
MergePixmaps(AllLayers[i], *ForMerging);
}
where ForMerging is temporary QPixmap object for, well, merging, and OriginalImage is, undoubtedly, QPixMap, that contains original image.
Again, i'm 100% sure, that all layers contain it's image on transparent background. The problem i'm facing is that in result original image is merged only with the last drawing, i.e. with AllLayers[4]. If i make i to run from 0 to 2(not including), for example, the result will be original image merged only with AllLayers[1]. I've struggled with this problem for a period of time and have no idea what might be wrong so i'm seeking for any help possible.

Answer 1

Try merge all QPixmap at the same call to MergePixmaps. For this change your Source variable at MergePixmap function to your AllLayers object like this:
void MeasuresWidget::MergePixmaps(AllLayers *source, QPixmap target)//draw source on target
{
QPainter painter(&target);
for(int i = 0; i < source->lenght();i++){
painter.drawPixmap(target.rect(),source->at(i),source->at(i).rect());
}
painter.end();
imageLabel->setPixmap(target);
}