1 ACCEPTED SOLUTION
Accepted Solutions
Hello @Ricko and welcome to the community!
1) is it possible to change the background image at runtime?
Yes.
2) If so, how? Do I just copy literally byte by byte the new image into the (FLASH I assume?) memory location storing the current image initially programmed by TouchGFX?
There is many way.
The simplest way is to set 2 images as background, one on top of the other. When you want to show the second background, simply set the first background not visible like so:
background1.setVisible(false);
background1.invalidate();
!!! Spoiler for question 3 !!!
A more complexes way is to change the bitmap of the image, because the images are stored as bitmaps.
You can find the ID of your bitmap in the BitmapDatabase.cpp file that is located in generated/images/src.
See the API documentation here : classtouchgfx_1_1_bitmap
See an example of bitmap change of an image here : ui-components/images/image
Finally, you can create a dynamic bitmap at runtime but this is clearly overkill.
3) what format (file type) is the image stored into the micro by TouchGFX initially?
Bitmap 😀 c.f. read answer to question 2.
4) for round displays, how it the image stored? Like a square image with transparent (or disregarded) corner areas? Or as a circle (which would obviously save some memory)?
They are stored as regular images.
If you have images that are transparent (or solid color) outside of the circle where they are displayed, you could save a lot of memory by compressing the images :
You could however save flash by disregarding the pixels outside the circle displayed for the framebuffer by enabling the GFX MMU but I am not very familiar with it : graphic-memory-optimization-with-stm32-chromgrc-stmicroelectronics.pdf
If memory is critical in your project, I invite you to watch this video : How to TouchGFX: Save flash memory
5) where can I find a list of displays that are already setup in TouchGFX?
You can find all the board + display combo already setup (by us or by our partners) by simply clicking "New", then "Create" and then you will see all the board + display combo already setup and you can search a specific board :
If this comment answer your question, I invite you to select it as "best answer".
regards,
Hello @Ricko and welcome to the community!
1) is it possible to change the background image at runtime?
Yes.
2) If so, how? Do I just copy literally byte by byte the new image into the (FLASH I assume?) memory location storing the current image initially programmed by TouchGFX?
There is many way.
The simplest way is to set 2 images as background, one on top of the other. When you want to show the second background, simply set the first background not visible like so:
background1.setVisible(false);
background1.invalidate();
!!! Spoiler for question 3 !!!
A more complexes way is to change the bitmap of the image, because the images are stored as bitmaps.
You can find the ID of your bitmap in the BitmapDatabase.cpp file that is located in generated/images/src.
See the API documentation here : classtouchgfx_1_1_bitmap
See an example of bitmap change of an image here : ui-components/images/image
Finally, you can create a dynamic bitmap at runtime but this is clearly overkill.
3) what format (file type) is the image stored into the micro by TouchGFX initially?
Bitmap 😀 c.f. read answer to question 2.
4) for round displays, how it the image stored? Like a square image with transparent (or disregarded) corner areas? Or as a circle (which would obviously save some memory)?
They are stored as regular images.
If you have images that are transparent (or solid color) outside of the circle where they are displayed, you could save a lot of memory by compressing the images :
You could however save flash by disregarding the pixels outside the circle displayed for the framebuffer by enabling the GFX MMU but I am not very familiar with it : graphic-memory-optimization-with-stm32-chromgrc-stmicroelectronics.pdf
If memory is critical in your project, I invite you to watch this video : How to TouchGFX: Save flash memory
5) where can I find a list of displays that are already setup in TouchGFX?
You can find all the board + display combo already setup (by us or by our partners) by simply clicking "New", then "Create" and then you will see all the board + display combo already setup and you can search a specific board :
If this comment answer your question, I invite you to select it as "best answer".
regards,
