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Convert mouse wheel coordinates to renderer view

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Fixes https://github.com/libsdl-org/SDL/issues/9097
This commit is contained in:
Sam Lantinga
2024-02-20 15:44:26 -08:00
parent f24216c2ba
commit 903d888cc3
1 changed files with 14 additions and 0 deletions
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14
src/render/SDL_render.c
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@@ -799,6 +799,20 @@ static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
event->button.y = (int)(event->button.y / (scale.y * renderer->dpi_scale.y));
}
}
} else if (event->type == SDL_MOUSEWHEEL) {
SDL_Window *window = SDL_GetWindowFromID(event->wheel.windowID);
if (window == renderer->window) {
int logical_w, logical_h;
SDL_DRect viewport;
SDL_FPoint scale;
GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
if (logical_w) {
event->wheel.mouseX -= (int)(viewport.x * renderer->dpi_scale.x);
event->wheel.mouseY -= (int)(viewport.y * renderer->dpi_scale.y);
event->wheel.mouseX = (int)(event->wheel.mouseX / (scale.x * renderer->dpi_scale.x));
event->wheel.mouseY = (int)(event->wheel.mouseY / (scale.y * renderer->dpi_scale.y));
}
}
} else if (event->type == SDL_FINGERDOWN ||
event->type == SDL_FINGERUP ||
event->type == SDL_FINGERMOTION) {