How do I grab gfx current transparent color?
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  • How do I grab gfx current transparent color?
  • 26 Feb 2021 05:02:07 pm
  • Last edited by Alvajoy123 on 26 Feb 2021 08:45:57 pm; edited 3 times in total
So I've been working on a oxygen and just ran into some "errors" testing out sprite masking.
I need to grab the currently set gfx transparent color.

Users stated in the chat why don't I just set a variable to the transparent color.

I simple don't risk increase the size of oxygen and making it more complicated for devs to use, or I can simple you force devs to set a variable to a transparent color ... or I can simply grab it from the memory or something.

here's some code: (Not finished)


Code:
void oxy_ApplyMaskToSprite(gfx_sprite_t *in_sprite, const gfx_sprite_t *mask_sprite)
{   
   uint8_t *in_data = in_sprite->data;
   uint8_t in_width = in_sprite->width;
   uint8_t in_height = in_sprite->height;
   
   uint8_t *mask_data = mask_sprite->data;
   uint8_t mask_width = mask_sprite->width;
   uint8_t mask_height = mask_sprite->height;
   
   uint8_t dim_error;
   
   if (mask_width != in_width)
      dim_error = 1;
   
   if (mask_hieght != in_hieght)
      dim_error = 1;
   
   if (dim_error){
      gfx_sprite_t *NewMask_Sprite;
      gfx_MallocSprite(in_width, in_hieght);
      gfx_ScaleSprite(mask_sprite, NewMask_Sprite);
      
      // resets all mask info
      mask_data = NewMask_Sprite->data;
      mask_width = NewMask_Sprite->width;
      mask_height = NewMask_Sprite->height;
      
      // process
      for (int i; i < mask_width * mask_hieght; i++){
         if (mask_data[i] == oxy_ReturnTransparentColor()){
            in_data[i] = oxy_ReturnTransparentColor();
         }
      }
      return;
   }
   
   for (int i; i < mask_width * mask_hieght; i++){
      if (mask_data[i] == oxy_ReturnTransparentColor()){
            in_data[i] = oxy_ReturnTransparentColor();
      }
   }
   
   return;
}


The dev gives a sprite they want to put a mask on and it set it to the transparent color.

// Don't mind the typo's <_<
Why not just have an additional argument in the function for the caller to provide the index of the transparent color?

It would make this particular function more versatile since the caller could then use it to mask with any palette index, rather than being required to have already set it in graphx.

There is a simple way in C to fetch graphx's transparent index, but that would actually be larger and slower than an additional function argument in this case.
Currently working on a v2 (complete re-write/overhaul) of this project: KryptonIDE - A better program editor for the TI 84+ CE
KryptonicDragon wrote:
Why not just have an additional argument in the function for the caller to provide the index of the transparent color?

It would make this particular function more versatile since the caller could then use it to mask with any palette index, rather than being required to have already set it in graphx.

There is a simple way in C to fetch graphx's transparent index, but that would actually be larger and slower than an additional function argument in this case.


Simply put, the "caller" has already set the transparent color at the beginning of his or her program making it wayyy more simpler for the "caller".

Calling the set transparent color function is the same as putting it in the function ... but setting it outside the function makes the function way smaller (needs less arguments).

I would love to know how to fetch the transparent color even if it way to big, or slow. "I'm testing the function out."
Alright, it's your hammer to hit your thumb with.
Per the documentation, when you call gfx_SetTransparentColor(), it returns the previous transparent index.
So, call it with an arbitrary index, like 0, and store what it returns into a variable. Then call gfx_SetTransparentColor() again with that variable to set it back to what it was before, if you need to.
Currently working on a v2 (complete re-write/overhaul) of this project: KryptonIDE - A better program editor for the TI 84+ CE
KryptonicDragon wrote:
Alright, it's your hammer to hit your thumb with.
Per the documentation, when you call gfx_SetTransparentColor(), it returns the previous transparent index.
So, call it with an arbitrary index, like 0, and store what it returns into a variable. Then call gfx_SetTransparentColor() again with that variable to set it back to what it was before, if you need to.


I just wrote some code to fetch the transparent color.

Code:
uint8_t oxy_ReturnTransparentColor(void)
{
   int color; //returns this
   color = gfx_SetTransparentColor(0);
   gfx_SetTransparentColor(color);
   return color;
}


I'm sure this should work Smile
I would probably have color be a uint8_t, but other than that it looks fine.
Past projects: HailStorm CE | Contagion CE | HUE CE | VYSION CE
Current projects: VYSION 2 CE | Crossroads CE
  
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