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libsdl-org / SDL_ttf

Support for TrueType (.ttf) font files with Simple Directmedia Layer.
zlib License
343 stars 116 forks source link

Atlas First Draft #358

Closed LevoDeLellis closed 1 month ago

LevoDeLellis commented 1 month ago

It's not complete but there's enough to start using it. I'm not happy with the name 'TTF_DestroyAtlas' and I'll need to improve the header documentation. I'm not sure what to do with the example. Using the hashmap in C++ looks nice but it appears no C++ examples are allowed? The C code is close enough. I'd want to improve both.

Another thing I plan on implementing is a way to reserve a series of rectangles so I can draw into them before creating a texture. IIRC GL supports a texture with 8bit alpha channel (GL_Alpha8 and GL_R8 for pixel shaders). Is it possible to use an alpha texture? Right now I use SDL_PIXELFORMAT_ARGB8888 and I only set the alpha bits (0x00FFFFFF | ((Uint32)*src << 24);)

If I can get feedback I'll adjust it while implementing the reserve rectangle code and upload a second draft. I'm not expecting this to be merged

LevoDeLellis commented 1 month ago

I don't have a windows machine. It should be easy enough to replace #ifdef WIN32 with SDL_PLATFORM_WINDOWS. I'm not sure why MSVC doesn't like my macro for variable length array

slouken commented 1 month ago

This code compiles with C89, which doesn't have variable length arrays. I haven't looked at the context, but usually those should be SDL_malloc() or SDL_small_alloc(), which falls back to SDL_malloc if the variable size is too big.

LevoDeLellis commented 1 month ago

I have more inspiration. I'll send a new pull request tonight.