Rename `InvalidTexture` to `NullTexture` to avoid confusion because the null texture is not invalid. The function `CTextureHandle::IsNullTexture` is added to make it easier to check the result of using `IGraphics::LoadTexture`, which returns the null texture on error instead of an invalid texture handle. An assertion is added to ensure that `IsNullTexture` works correctly.
The handle returned by `LoadTextureRaw` is either valid or invalid (i.e. `-1`) but never the invalid texture itself.
Additionally, ensure that the `LoadTexture` function returns the invalid texture also when `LoadTextureRaw` fails.
Load theme icons individually for all themes that have been loaded instead of doing a separate scan of the `themes` folder for the icons.
Fix screen occasionally flashing black when opening the general settings. This was caused by `UpdateAndSwap` randomly being called when theme loading takes longer than 1/60 seconds, which sometimes happens on the first start of the client after rebooting the machine. Now the loading popup is correctly rendered when theme loading takes longer than 500ms, which is consistent with the behavior when loading other files.
Minor improvements to log messages.
Using `CMenus::PopupWarning` will immediately set the popup and override the current warning, which can hide warnings when multiple are shown at the same time. Now all warnings are added to the queue with `IClient::AddWarning`.
Add assertions to prevent map items and data that are too large to be represented by the map format from being written to maps. Additionally, ensure that the size of the whole map file is not too large to be represented by the map header.
Prevent `malloc` of size 0, which is implementation defined and should be avoided, when adding items without data, which happens for example when adding an empty array of envelope points.
Show a warning popup when a map image or sound cannot be loaded for any reason. Only one generic warning popup is shown for images and sounds individually.
The image name is only required for external images. For embedded images it was only used in log messages. This fixes rendering with various maps that have embedded images with invalid names.
Parallax Zoom improves the appearance of maps visually when zooming.
Contrary to initial tests, it does not interfere with certain map
locations such as the shop on the map Timeshop.
The default value appears to be correct for all existing maps.
The value in the map file is non-trivial to manage, and provides little
benefit. See https://github.com/ddnet/ddnet/issues/6196 for further
discussion.
Limit number of sounds being loaded in the client to 64, instead of writing sample indices out of bounds.
Check if sound indices are out of bounds. It was only checked whether the sound index is -1 but no other bounds checking was performed.
Check if image indices are out of bounds. It was not checked for all negative image indices, only -1 was considered.
Add popup message in the editor when trying to add more than 64 sounds, same as for images.
Limit number of images in `map_convert_07` tool, instead of writing out of bounds.
Add easter, halloween and xmas to `enum ETimeSeason` and `time_season` function. This unifies the logic for detecting these events and seasons in one function. This allows adding support for special easter, halloween and xmas theme maps in the future. The `localtime` function is not used outside `system.c` anymore. The code for detecting easter is taken from upstream.
ChillerDragon