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Added support for high-DPI cursors and icons

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Fixes https://github.com/libsdl-org/SDL/issues/9838
This commit is contained in:
Sam Lantinga 2024-08-01 11:38:17 -07:00
parent 94d9229ce2
commit 31ed3665ad
6 changed files with 200 additions and 42 deletions
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52
test/testcustomcursor.c
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@ -109,10 +109,8 @@ static const char *cross[] = {
"0,0"
};
static SDL_Cursor *
init_color_cursor(const char *file)
static SDL_Surface *load_image_file(const char *file)
{
SDL_Cursor *cursor = NULL;
SDL_Surface *surface = SDL_LoadBMP(file);
if (surface) {
if (SDL_GetSurfacePalette(surface)) {
@ -138,14 +136,50 @@ init_color_cursor(const char *file)
break;
}
}
}
return surface;
}
static SDL_Surface *load_image(const char *file)
{
SDL_Surface *surface = load_image_file(file);
if (surface) {
/* Add a 2x version of this image, if available */
SDL_Surface *surface2x = NULL;
const char *ext = SDL_strrchr(file, '.');
size_t len = SDL_strlen(file) + 2 + 1;
char *file2x = (char *)SDL_malloc(len);
if (file2x) {
SDL_strlcpy(file2x, file, len);
if (ext) {
SDL_memcpy(file2x + (ext - file), "2x", 3);
SDL_strlcat(file2x, ext, len);
} else {
SDL_strlcat(file2x, "2x", len);
}
surface2x = load_image_file(file2x);
SDL_free(file2x);
}
if (surface2x) {
SDL_AddSurfaceAlternateImage(surface, surface2x);
SDL_DestroySurface(surface2x);
}
}
return surface;
}
static SDL_Cursor *init_color_cursor(const char *file)
{
SDL_Cursor *cursor = NULL;
SDL_Surface *surface = load_image(file);
if (surface) {
cursor = SDL_CreateColorCursor(surface, 0, 0);
SDL_DestroySurface(surface);
}
return cursor;
}
static SDL_Cursor *
init_system_cursor(const char *image[])
static SDL_Cursor *init_system_cursor(const char *image[])
{
int i, row, col;
Uint8 data[4 * 32];
@ -373,6 +407,14 @@ int main(int argc, char *argv[])
num_cursors = 0;
if (color_cursor) {
SDL_Surface *icon = load_image(color_cursor);
if (icon) {
for (i = 0; i < state->num_windows; ++i) {
SDL_SetWindowIcon(state->windows[i], icon);
}
SDL_DestroySurface(icon);
}
cursor = init_color_cursor(color_cursor);
if (cursor) {
cursors[num_cursors] = cursor;