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This patch solves several problems introducing the possibility to specify a row stride bigger than the width (visible pixels) on each image row. Useful in case that we want to align the initial pixel address of each row (if DOC_USE_ALIGNED_PIXELS is defined). This allows us to use some SIMD intrinsics (e.g. SSE2) for some image functions in the future (right now implemented only in the new is_same_image_simd_templ() for is_same_image()). Anyway to avoid breaking some existing code, by default we'll still keep the old behavior: row stride bytes = width bytes (so DOC_USE_ALIGNED_PIXELS is undefined).
Here are third party libraries with necessary components for Aseprite. Some directories are git submodules, and other are just a copy of its original package.