Add system tray support (#10873)

src/video/windows/SDL_surface_utils.c

@@ -0,0 +1,95 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "SDL_surface_utils.h"
+
+#include "../SDL_surface_c.h"
+
+HICON CreateIconFromSurface(SDL_Surface *surface)
+{
+    SDL_Surface *s = SDL_ConvertSurface(surface, SDL_PIXELFORMAT_RGBA32);
+    if (!s) {
+        return NULL;
+    }
+
+    /* The dimensions will be needed after s is freed */
+    const int width = s->w;
+    const int height = s->h;
+
+    BITMAPINFO bmpInfo;
+    ZeroMemory(&bmpInfo, sizeof(BITMAPINFO));
+    bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+    bmpInfo.bmiHeader.biWidth = width;
+    bmpInfo.bmiHeader.biHeight = -height; /* Top-down bitmap */
+    bmpInfo.bmiHeader.biPlanes = 1;
+    bmpInfo.bmiHeader.biBitCount = 32;
+    bmpInfo.bmiHeader.biCompression = BI_RGB;
+
+    HDC hdc = GetDC(NULL);
+    void* pBits = NULL;
+    HBITMAP hBitmap = CreateDIBSection(hdc, &bmpInfo, DIB_RGB_COLORS, &pBits, NULL, 0);
+    if (!hBitmap) {
+        ReleaseDC(NULL, hdc);
+        SDL_DestroySurface(s);
+        return NULL;
+    }
+
+    SDL_memcpy(pBits, s->pixels, width * height * 4);
+
+    SDL_DestroySurface(s);
+
+    HBITMAP hMask = CreateBitmap(width, height, 1, 1, NULL);
+    if (!hMask) {
+        DeleteObject(hBitmap);
+        ReleaseDC(NULL, hdc);
+        return NULL;
+    }
+
+    HDC hdcMem = CreateCompatibleDC(hdc);
+    HGDIOBJ oldBitmap = SelectObject(hdcMem, hMask);
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            BYTE* pixel = (BYTE*)pBits + (y * width + x) * 4;
+            BYTE alpha = pixel[3];
+            COLORREF maskColor = (alpha == 0) ? RGB(0, 0, 0) : RGB(255, 255, 255);
+            SetPixel(hdcMem, x, y, maskColor);
+        }
+    }
+
+    ICONINFO iconInfo;
+    iconInfo.fIcon = TRUE;
+    iconInfo.xHotspot = 0;
+    iconInfo.yHotspot = 0;
+    iconInfo.hbmMask = hMask;
+    iconInfo.hbmColor = hBitmap;
+
+    HICON hIcon = CreateIconIndirect(&iconInfo);
+
+    SelectObject(hdcMem, oldBitmap);
+    DeleteDC(hdcMem);
+    DeleteObject(hBitmap);
+    DeleteObject(hMask);
+    ReleaseDC(NULL, hdc);
+
+    return hIcon;
+}