Add GIF import

Add GIF file loading
Add `ResourceFormatLoader` for `AnimatedTexture`
Add `ImageFrames` resource for handling image sequence
Add `ImageFramesLoader` for resource loading image sequences
Add `ResourceFormatLoader` for `ImageFrames`
Add GIF image load test assertions
Add ImageFrames test cases

Author: Spartan322

COPYRIGHT.txt

@@ -269,6 +269,11 @@ Comment: The FreeType Project
 Copyright: 1996-2023, David Turner, Robert Wilhelm, and Werner Lemberg.
 License: FTL
 
+Files: thirdparty/giflib/*
+Comment: giflib
+Copyright: 1997-2024, Eric S. Raymond
+License: Expat
+
 Files: thirdparty/glad/*
 Comment: glad
 Copyright: 2013-2022, David Herberth

core/io/image.cpp

@@ -107,6 +107,7 @@ ImageMemLoadFunc Image::_tga_mem_loader_func = nullptr;
 ImageMemLoadFunc Image::_bmp_mem_loader_func = nullptr;
 ScalableImageMemLoadFunc Image::_svg_scalable_mem_loader_func = nullptr;
 ImageMemLoadFunc Image::_ktx_mem_loader_func = nullptr;
+ImageMemLoadFunc Image::_gif_mem_loader_func = nullptr;
 
 // External VRAM compression function pointers.
 
@@ -3579,6 +3580,7 @@ void Image::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("load_tga_from_buffer", "buffer"), &Image::load_tga_from_buffer);
 	ClassDB::bind_method(D_METHOD("load_bmp_from_buffer", "buffer"), &Image::load_bmp_from_buffer);
 	ClassDB::bind_method(D_METHOD("load_ktx_from_buffer", "buffer"), &Image::load_ktx_from_buffer);
+	ClassDB::bind_method(D_METHOD("load_gif_from_buffer", "buffer"), &Image::load_gif_from_buffer);
 
 	ClassDB::bind_method(D_METHOD("load_svg_from_buffer", "buffer", "scale"), &Image::load_svg_from_buffer, DEFVAL(1.0));
 	ClassDB::bind_method(D_METHOD("load_svg_from_string", "svg_str", "scale"), &Image::load_svg_from_string, DEFVAL(1.0));
@@ -4104,6 +4106,14 @@ Error Image::load_ktx_from_buffer(const Vector<uint8_t> &p_array) {
 	return _load_from_buffer(p_array, _ktx_mem_loader_func);
 }
 
+Error Image::load_gif_from_buffer(const Vector<uint8_t> &p_array) {
+	ERR_FAIL_NULL_V_MSG(
+			_gif_mem_loader_func,
+			ERR_UNAVAILABLE,
+			"The GIF module isn't enabled. Recompile the Redot editor or export template binary with the `module_gif_enabled=yes` SCons option.");
+	return _load_from_buffer(p_array, _gif_mem_loader_func);
+}
+
 void Image::convert_rg_to_ra_rgba8() {
 	ERR_FAIL_COND(format != FORMAT_RGBA8);
 	ERR_FAIL_COND(data.is_empty());