LCD.blitCopy parameters.

[FTkal.1]

Can anyone explain to me what the parameters to LCD.blitCopy are?

The online help seems to suggest all of the parameters describe the source - sourceData, sourceFormat, source and blitRect all describe the source data. How do I specify the destination?

[Romain DIELEMAN]

Hi,

The blitCopy function copies a block of data to the framebuffer, which you know and can define the address.

Do you wish to copy it outside of it? What are you trying to achieve?

/Romain

[FTkal.1]

I was extending the Image widget to display the bitmap flipped horizontally or vertically. I wanted to be able to fill a buffer, one scanline at a time, and copy it directly to the framebuffer.

[Romain DIELEMAN]

If i understand correctly you are trying to rotate your image . Have you tried the using the texture mapper widget? This widget allows you do display rotated/scaled images to have some fancy animations. Would this be enough for what you are trying to achieve?

[FTkal.1]

No, that won't work because I'm trying to mirror, not rotate.

Because I couldn't work out how to use blitCopy, I've been using drawPartialBitmap to draw one line at a time in reverse - ymax down to ymin, to mirror vertically. But I can't get get horizontal mirroring working, where I need to swap the pixels in a line, and then draw that. To mirror X, I've created a working bitmap of size DISPLAY_WIDTH x 1, then write directly into the bitmap memory buffer returned by dynamicBitmapGetAddress() , then call drawPartialBitmap and repeating for each line.

I don't know if blitCopy will be suitable because some of my bitmaps have transparency (I use both RGB888 and ARGB8888)