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Mouse coordinates are floating point

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You can get sub-pixel mouse coordinates and motion depending on the platform and display scaling.

Fixes https://github.com/libsdl-org/SDL/issues/2999
This commit is contained in:
Sam Lantinga 2022-12-29 19:31:12 -08:00
parent 8c3239dee5
commit cefbeb582f
52 changed files with 564 additions and 654 deletions
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56
src/render/SDL_render.c
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@ -759,21 +759,15 @@ static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
SDL_FPoint scale;
GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
if (logical_w) {
event->motion.x -= (int)(viewport.x * renderer->dpi_scale.x);
event->motion.y -= (int)(viewport.y * renderer->dpi_scale.y);
event->motion.x = (int)(event->motion.x / (scale.x * renderer->dpi_scale.x));
event->motion.y = (int)(event->motion.y / (scale.y * renderer->dpi_scale.y));
if (event->motion.xrel != 0 && renderer->relative_scaling) {
float rel = renderer->xrel + event->motion.xrel / (scale.x * renderer->dpi_scale.x);
float truncated = SDL_truncf(rel);
renderer->xrel = rel - truncated;
event->motion.xrel = (Sint32)truncated;
event->motion.x -= (float)(viewport.x * renderer->dpi_scale.x);
event->motion.y -= (float)(viewport.y * renderer->dpi_scale.y);
event->motion.x /= (scale.x * renderer->dpi_scale.x);
event->motion.y /= (scale.y * renderer->dpi_scale.y);
if (event->motion.xrel != 0.0f && renderer->relative_scaling) {
event->motion.xrel /= (scale.x * renderer->dpi_scale.x);
}
if (event->motion.yrel != 0 && renderer->relative_scaling) {
float rel = renderer->yrel + event->motion.yrel / (scale.y * renderer->dpi_scale.y);
float truncated = SDL_truncf(rel);
renderer->yrel = rel - truncated;
event->motion.yrel = (Sint32)truncated;
if (event->motion.yrel != 0.0f && renderer->relative_scaling) {
event->motion.yrel /= (scale.y * renderer->dpi_scale.y);
}
}
}
@ -786,10 +780,24 @@ static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
SDL_FPoint scale;
GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
if (logical_w) {
event->button.x -= (int)(viewport.x * renderer->dpi_scale.x);
event->button.y -= (int)(viewport.y * renderer->dpi_scale.y);
event->button.x = (int)(event->button.x / (scale.x * renderer->dpi_scale.x));
event->button.y = (int)(event->button.y / (scale.y * renderer->dpi_scale.y));
event->button.x -= (float)(viewport.x * renderer->dpi_scale.x);
event->button.y -= (float)(viewport.y * renderer->dpi_scale.y);
event->button.x /= (scale.x * renderer->dpi_scale.x);
event->button.y /= (scale.y * renderer->dpi_scale.y);
}
}
} else if (event->type == SDL_MOUSEWHEEL) {
SDL_Window *window = SDL_GetWindowFromID(event->button.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 -= (float)(viewport.x * renderer->dpi_scale.x);
event->wheel.mouseY -= (float)(viewport.y * renderer->dpi_scale.y);
event->wheel.mouseX /= (scale.x * renderer->dpi_scale.x);
event->wheel.mouseY /= (scale.y * renderer->dpi_scale.y);
}
}
} else if (event->type == SDL_FINGERDOWN ||
@ -2510,14 +2518,14 @@ void SDL_GetRenderScale(SDL_Renderer *renderer, float *scaleX, float *scaleY)
}
}
void SDL_RenderWindowToLogical(SDL_Renderer *renderer, int windowX, int windowY, float *logicalX, float *logicalY)
void SDL_RenderWindowToLogical(SDL_Renderer *renderer, float windowX, float windowY, float *logicalX, float *logicalY)
{
float window_physical_x, window_physical_y;
CHECK_RENDERER_MAGIC(renderer, );
window_physical_x = ((float)windowX) / renderer->dpi_scale.x;
window_physical_y = ((float)windowY) / renderer->dpi_scale.y;
window_physical_x = (windowX / renderer->dpi_scale.x);
window_physical_y = (windowY / renderer->dpi_scale.y);
if (logicalX) {
*logicalX = (float)((window_physical_x - renderer->viewport.x) / renderer->scale.x);
@ -2527,7 +2535,7 @@ void SDL_RenderWindowToLogical(SDL_Renderer *renderer, int windowX, int windowY,
}
}
void SDL_RenderLogicalToWindow(SDL_Renderer *renderer, float logicalX, float logicalY, int *windowX, int *windowY)
void SDL_RenderLogicalToWindow(SDL_Renderer *renderer, float logicalX, float logicalY, float *windowX, float *windowY)
{
float window_physical_x, window_physical_y;
@ -2537,10 +2545,10 @@ void SDL_RenderLogicalToWindow(SDL_Renderer *renderer, float logicalX, float log
window_physical_y = (float)((logicalY * renderer->scale.y) + renderer->viewport.y);
if (windowX) {
*windowX = (int)(window_physical_x * renderer->dpi_scale.x);
*windowX = (window_physical_x * renderer->dpi_scale.x);
}
if (windowY) {
*windowY = (int)(window_physical_y * renderer->dpi_scale.y);
*windowY = (window_physical_y * renderer->dpi_scale.y);
}
}