From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 .../src/video/windows/SDL_windowsframebuffer.c     | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/video/windows/SDL_windowsframebuffer.c

(limited to 'contrib/SDL-3.2.8/src/video/windows/SDL_windowsframebuffer.c')

diff --git a/contrib/SDL-3.2.8/src/video/windows/SDL_windowsframebuffer.c b/contrib/SDL-3.2.8/src/video/windows/SDL_windowsframebuffer.c
new file mode 100644
index 0000000..f2bbd59
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/windows/SDL_windowsframebuffer.c
@@ -0,0 +1,132 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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"
+
+#if defined(SDL_VIDEO_DRIVER_WINDOWS) && !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)
+
+#include "SDL_windowsvideo.h"
+
+bool WIN_CreateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, SDL_PixelFormat *format, void **pixels, int *pitch)
+{
+    SDL_WindowData *data = window->internal;
+    bool isstack;
+    size_t size;
+    LPBITMAPINFO info;
+    HBITMAP hbm;
+    int w, h;
+
+    SDL_GetWindowSizeInPixels(window, &w, &h);
+
+    // Free the old framebuffer surface
+    if (data->mdc) {
+        DeleteDC(data->mdc);
+    }
+    if (data->hbm) {
+        DeleteObject(data->hbm);
+    }
+
+    // Find out the format of the screen
+    size = sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD);
+    info = (LPBITMAPINFO)SDL_small_alloc(Uint8, size, &isstack);
+    if (!info) {
+        return false;
+    }
+
+    SDL_memset(info, 0, size);
+    info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+
+    // The second call to GetDIBits() fills in the bitfields
+    hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
+    GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
+    GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
+    DeleteObject(hbm);
+
+    *format = SDL_PIXELFORMAT_UNKNOWN;
+    if (info->bmiHeader.biCompression == BI_BITFIELDS) {
+        int bpp;
+        Uint32 *masks;
+
+        bpp = info->bmiHeader.biPlanes * info->bmiHeader.biBitCount;
+        masks = (Uint32 *)((Uint8 *)info + info->bmiHeader.biSize);
+        *format = SDL_GetPixelFormatForMasks(bpp, masks[0], masks[1], masks[2], 0);
+    }
+    if (*format == SDL_PIXELFORMAT_UNKNOWN) {
+        // We'll use RGB format for now
+        *format = SDL_PIXELFORMAT_XRGB8888;
+
+        // Create a new one
+        SDL_memset(info, 0, size);
+        info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+        info->bmiHeader.biPlanes = 1;
+        info->bmiHeader.biBitCount = 32;
+        info->bmiHeader.biCompression = BI_RGB;
+    }
+
+    // Fill in the size information
+    *pitch = (((w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
+    info->bmiHeader.biWidth = w;
+    info->bmiHeader.biHeight = -h; // negative for topdown bitmap
+    info->bmiHeader.biSizeImage = (DWORD)h * (*pitch);
+
+    data->mdc = CreateCompatibleDC(data->hdc);
+    data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
+    SDL_small_free(info, isstack);
+
+    if (!data->hbm) {
+        return WIN_SetError("Unable to create DIB");
+    }
+    SelectObject(data->mdc, data->hbm);
+
+    return true;
+}
+
+bool WIN_UpdateWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window, const SDL_Rect *rects, int numrects)
+{
+    SDL_WindowData *data = window->internal;
+    int i;
+
+    for (i = 0; i < numrects; ++i) {
+        BitBlt(data->hdc, rects[i].x, rects[i].y, rects[i].w, rects[i].h,
+               data->mdc, rects[i].x, rects[i].y, SRCCOPY);
+    }
+    return true;
+}
+
+void WIN_DestroyWindowFramebuffer(SDL_VideoDevice *_this, SDL_Window *window)
+{
+    SDL_WindowData *data = window->internal;
+
+    if (!data) {
+        // The window wasn't fully initialized
+        return;
+    }
+
+    if (data->mdc) {
+        DeleteDC(data->mdc);
+        data->mdc = NULL;
+    }
+    if (data->hbm) {
+        DeleteObject(data->hbm);
+        data->hbm = NULL;
+    }
+}
+
+#endif // SDL_VIDEO_DRIVER_WINDOWS
-- 
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