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Added notes for migrating SDL_GetRGBA()/SDL_MapRGBA() code

This commit is contained in:
Sam Lantinga 2024-07-10 13:19:46 -07:00
parent af2dbf3ff3
commit 60ed914c66
1 changed files with 20 additions and 2 deletions
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22
docs/README-migration.md
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@ -349,13 +349,13 @@ The SDL_EVENT_WINDOW_SIZE_CHANGED event has been removed, and you can use SDL_EV
The keysym field of key events has been removed to remove one level of indirection, and `sym` has been renamed `key`.
Code that looked like this:
Code that used to look like this:
```c
SDL_Event event;
SDL_Keycode key = event.key.keysym.sym;
SDL_Keymod mod = event.key.keysym.mod;
```
now looks like this:
should be changed to:
```c
SDL_Event event;
SDL_Keycode key = event.key.key;
@ -1098,6 +1098,24 @@ SDL_PixelFormatEnum has been renamed SDL_PixelFormat and is used instead of Uint
SDL_MapRGB(), SDL_MapRGBA(), SDL_GetRGB(), and SDL_GetRGBA() take an optional palette parameter for indexed color lookups.
Code that used to look like this:
```c
SDL_GetRGBA(pixel, surface->format, &r, &g, &b, &a);
```
should be changed to:
```c
SDL_GetRGBA(pixel, SDL_GetPixelFormatDetails(surface->format), SDL_GetSurfacePalette(surface), &r, &g, &b, &a);
```
Code that used to look like this:
```c
pixel = SDL_MapRGBA(surface->format, r, g, b, a);
```
should be changed to:
```c
pixel = SDL_MapSurfaceRGBA(surface, r, g, b, a);
```
SDL_GetMasksForPixelFormat() now returns the standard int error code.
SDL_CalculateGammaRamp has been removed, because SDL_SetWindowGammaRamp has been removed as well due to poor support in modern operating systems (see [SDL_video.h](#sdl_videoh)).