Is there Gfx interface to get screen/display size ?

[ferro]

Hi,

I cannot find API to get display height/width. Is there any ? I tried to find something like

int16_t touchgfx::HAL::GetDisplayHeight ();
int16_t touchgfx::HAL::GetDisplayWidth ();

In GfxDesigner I see 240x320 values:

In TouchGFXConfiguration.cpp there is display initialisation:

static TouchGFXHAL hal ( dma, display, tc, 240, 320 );

SimConstants.hpp contains

static unsigned short SIM_WIDTH = 240;
static unsigned short SIM_HEIGHT = 320;

Thanks

Ferro

[GaetanGodart]

Hello @ferro ,

You can use getScreenHeight() and getScreenWidth() (no need to put anything in front of those methods).
See : classtouchgfx_1_1_screen 

Regards,

[ferro]

Thanks @GaetanGodart ,

this is close but not enough.

>"no need to put anything in front of those methods"

This is true only when within methods of a gfx::Screen derived class or having an instance of it.

Implementation of Screen::getScreenHeight () looked promissing

however, it is a variable

So cannot be used with compile-time expressions e.g.

static constexpr int DisplayNumberOfPixels { HAL::DISPLAY_HEIGHT * HAL::DISPLAY_WIDTH };

Best,

[GaetanGodart · Accepted solution]

Hello @ferro ,

So you need a define?

I have found a few defines but they seem to not be used for every project:

ft5336.h seems to be a driver or a library related to the screen used:

stm32746g_discovery_camera.c is clearly related to the mcu:

SDL_test_common.h seems the most promising but I don't know what is PSP and why it is not declared there.
Also, SDL is used for the simulator :

SimConstants.hpp is generated by TouchGFX and accessible "in his scope" so this might be your best bet.
Since it is a static unsigned short, can you use it in your expression?

The value is also available in the .ioc and .touchgfx files:

I hope this helps you, I am not sure what you need.

Regards,

[ferro]

Hi @GaetanGodart 

>"So you need a define?"
Good question. Yes, I need defines. I realised I did not say that clearly in my OP. Sorry.

I want to have a widget parameters to be calculated at compile time e.g.:

struct rect_t
{
	int16_t x;
	int16_t y;
	int16_t xw;
	int16_t yh;
};

static constexpr rect_t Position
{
	20,
	20,
	WIDTH_DEFINE_GENERATED_BY_GFX_DESIGNER   - (2*20),
	HEIGHT_DEFINE_GENERATED_BY_GFX_DESIGNER  - (2*20)
};

I hoped that GfxDesigner auto-generates defines I could use in my scenario, but it does not.

I think it should and then use these defines in all auto-generated code as well which, in my case 320x240, looks e.g. like this:

ScreenViewBase
::ScreenViewBase ()
{
    __background.setPosition(0, 0, 320, 240);
    __background.setColor(touchgfx::Color::getColorFromRGB(0, 0, 0));
    add(__background);

    // ...
}

[GaetanGodart]

Hello @ferro ,

The SimConstants.hpp file does seem to have this information.
It is just unfortunate that we don't clearly refer to a constant for the various generated functions that require the screen size.

Have you tried accessing SIM_WIDTH and height from SimConstants.hpp?
Even if this file seems to only be used for simulation, I expect it to still exist and be accessible when compiling for the target.

You have selected my last comment as best answer. Were you able to solve your problem?

Regards,

[ferro]

Hi @GaetanGodart 

>"The SimConstants.hpp file does seem to have this information."

Yes it does, however not marked as 'const(expr)' so cannot be used in compile-time calcs.

>"You have selected my last comment as best answer. Were you able to solve your problem?"

Yes, I think the answer is what I want is sth specialized and there are many places where screen size is available as you showed. I'll define my own global height&width.

Thanks for help.

[GaetanGodart]

My pleasure! 😊