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emscripten: resizable windows take whole page, resize with browser window.

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This also implements the SetWindowResizable interface, so this can be now
toggled after window creation, too.

Fixes #11949.
This commit is contained in:
Ryan C. Gordon
2025-01-17 17:57:44 -05:00
parent ee469c6aff
commit d317fc9c08
2 changed files with 63 additions and 38 deletions
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9
src/video/emscripten/SDL_emscriptenevents.c
View File

@@ -624,14 +624,9 @@ static EM_BOOL Emscripten_HandleResize(int eventType, const EmscriptenUiEvent *u
}
if (!(window_data->window->flags & SDL_WINDOW_FULLSCREEN)) {
// this will only work if the canvas size is set through css
if (window_data->window->flags & SDL_WINDOW_RESIZABLE) {
double w = window_data->window->w;
double h = window_data->window->h;
if (window_data->external_size) {
emscripten_get_element_css_size(window_data->canvas_id, &w, &h);
}
const double w = (double) uiEvent->windowInnerWidth;
const double h = (double) uiEvent->windowInnerHeight;
emscripten_set_canvas_element_size(window_data->canvas_id, SDL_lroundf(w * window_data->pixel_ratio), SDL_lroundf(h * window_data->pixel_ratio));

92
src/video/emscripten/SDL_emscriptenvideo.c
View File

@@ -47,6 +47,7 @@ static void Emscripten_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window)
static SDL_FullscreenResult Emscripten_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_VideoDisplay *display, SDL_FullscreenOp fullscreen);
static void Emscripten_PumpEvents(SDL_VideoDevice *_this);
static void Emscripten_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window);
static void Emscripten_SetWindowResizable(SDL_VideoDevice *_this, SDL_Window *window, bool resizable);
static bool pumpevents_has_run = false;
static int pending_swap_interval = -1;
@@ -156,6 +157,7 @@ static SDL_VideoDevice *Emscripten_CreateDevice(void)
device->CreateSDLWindow = Emscripten_CreateWindow;
device->SetWindowTitle = Emscripten_SetWindowTitle;
device->SetWindowResizable = Emscripten_SetWindowResizable;
/*device->SetWindowIcon = Emscripten_SetWindowIcon;
device->SetWindowPosition = Emscripten_SetWindowPosition;*/
device->SetWindowSize = Emscripten_SetWindowSize;
@@ -281,8 +283,6 @@ EMSCRIPTEN_KEEPALIVE void requestFullscreenThroughSDL(SDL_Window *window)
static bool Emscripten_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_PropertiesID props)
{
SDL_WindowData *wdata;
double scaled_w, scaled_h;
double css_w, css_h;
const char *selector;
// Allocate window internal data
@@ -304,44 +304,20 @@ static bool Emscripten_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window,
wdata->pixel_ratio = 1.0f;
}
scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
// set a fake size to check if there is any CSS sizing the canvas
emscripten_set_canvas_element_size(wdata->canvas_id, 1, 1);
emscripten_get_element_css_size(wdata->canvas_id, &css_w, &css_h);
wdata->external_size = SDL_floor(css_w) != 1 || SDL_floor(css_h) != 1;
if ((window->flags & SDL_WINDOW_RESIZABLE) && wdata->external_size) {
// external css has resized us
scaled_w = css_w * wdata->pixel_ratio;
scaled_h = css_h * wdata->pixel_ratio;
SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESIZED, SDL_lroundf(css_w), SDL_lroundf(css_h));
}
emscripten_set_canvas_element_size(wdata->canvas_id, SDL_lroundf(scaled_w), SDL_lroundf(scaled_h));
// if the size is not being controlled by css, we need to scale down for hidpi
if (!wdata->external_size) {
if (wdata->pixel_ratio != 1.0f) {
// scale canvas down
emscripten_set_element_css_size(wdata->canvas_id, window->w, window->h);
}
}
wdata->window = window;
// Setup driver data for this window
window->internal = wdata;
Emscripten_SetWindowResizable(_this, window, (window->flags & SDL_WINDOW_RESIZABLE) != 0);
// One window, it always has focus
SDL_SetMouseFocus(window);
SDL_SetKeyboardFocus(window);
Emscripten_RegisterEventHandlers(wdata);
// disable the emscripten "fullscreen" button.
// Make the emscripten "fullscreen" button go through SDL.
MAIN_THREAD_EM_ASM({
Module['requestFullscreen'] = function(lockPointer, resizeCanvas) {
_requestFullscreenThroughSDL($0);
@@ -354,10 +330,12 @@ static bool Emscripten_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window,
static void Emscripten_SetWindowSize(SDL_VideoDevice *_this, SDL_Window *window)
{
SDL_WindowData *data;
if ((window->flags & SDL_WINDOW_RESIZABLE) == 0) {
return; // canvas size is being dictated by the browser window size, refuse request.
}
if (window->internal) {
data = window->internal;
SDL_WindowData *data = window->internal;
// update pixel ratio
if (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY) {
data->pixel_ratio = emscripten_get_device_pixel_ratio();
@@ -455,4 +433,56 @@ static void Emscripten_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window
emscripten_set_window_title(window->title);
}
static void Emscripten_SetWindowResizable(SDL_VideoDevice *_this, SDL_Window *window, bool resizable)
{
SDL_WindowData *wdata = window->internal;
double scaled_w = SDL_floor(window->w * wdata->pixel_ratio);
double scaled_h = SDL_floor(window->h * wdata->pixel_ratio);
double css_w, css_h;
// set a fake size to check if there is any CSS sizing the canvas
emscripten_set_canvas_element_size(wdata->canvas_id, 1, 1);
emscripten_get_element_css_size(wdata->canvas_id, &css_w, &css_h);
wdata->external_size = SDL_floor(css_w) != 1 || SDL_floor(css_h) != 1;
if (wdata->external_size) {
window->flags &= ~SDL_WINDOW_RESIZABLE; // can't be resizable if something else is controlling it.
}
// SDL_WINDOW_RESIZABLE takes up the entire page and resizes as the browser window resizes.
if (window->flags & SDL_WINDOW_RESIZABLE) {
const double w = (double) MAIN_THREAD_EM_ASM_INT({ return window.innerWidth; });
const double h = (double) MAIN_THREAD_EM_ASM_INT({ return window.innerHeight; });
scaled_w = w * wdata->pixel_ratio;
scaled_h = h * wdata->pixel_ratio;
MAIN_THREAD_EM_ASM({
var canvas = document.querySelector(UTF8ToString($0));
canvas.style.position = 'absolute';
canvas.style.top = '0';
canvas.style.right = '0';
}, wdata->canvas_id);
SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESIZED, SDL_lroundf(scaled_w), SDL_lroundf(scaled_h));
} else {
MAIN_THREAD_EM_ASM({
var canvas = document.querySelector(UTF8ToString($0));
canvas.style.position = undefined;
canvas.style.top = undefined;
canvas.style.right = undefined;
}, wdata->canvas_id);
}
emscripten_set_canvas_element_size(wdata->canvas_id, SDL_lroundf(scaled_w), SDL_lroundf(scaled_h));
// if the size is not being controlled by css, we need to scale down for hidpi
if (!wdata->external_size) {
if (wdata->pixel_ratio != 1.0f) {
// scale canvas down
emscripten_set_element_css_size(wdata->canvas_id, window->w, window->h);
}
}
}
#endif // SDL_VIDEO_DRIVER_EMSCRIPTEN