mirror of
https://github.com/libsdl-org/SDL.git
synced 2026-03-31 06:11:04 +02:00
76392f4fe1
Fixes DPI awareness of testdrawchessboard (previously, the surface was
being created in points instead of pixels, resulting in the demo app
only drawing in a corner of the screen on High-DPI displays)
*_CreateWindowFramebuffer()/*_UpdateWindowFramebuffer(): are updated
to use SDL_GetWindowSizeInPixels instead of SDL_GetWindowSize() or
window->w/window->h.
Most of the _CreateWindowFramebuffer backends are untested except
for Windows.
Fixes #7047
(cherry picked from commit 67c91353e0)
135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_VIDEO_DRIVER_WINDOWS && !defined(__XBOXONE__) && !defined(__XBOXSERIES__)
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#include "SDL_windowsvideo.h"
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int WIN_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
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{
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SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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SDL_bool isstack;
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size_t size;
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LPBITMAPINFO info;
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HBITMAP hbm;
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int w, h;
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SDL_GetWindowSizeInPixels(window, &w, &h);
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/* Free the old framebuffer surface */
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if (data->mdc) {
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DeleteDC(data->mdc);
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}
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if (data->hbm) {
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DeleteObject(data->hbm);
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}
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/* Find out the format of the screen */
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size = sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD);
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info = (LPBITMAPINFO)SDL_small_alloc(Uint8, size, &isstack);
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if (!info) {
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return SDL_OutOfMemory();
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}
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SDL_memset(info, 0, size);
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info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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/* The second call to GetDIBits() fills in the bitfields */
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hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
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GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
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GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
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DeleteObject(hbm);
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*format = SDL_PIXELFORMAT_UNKNOWN;
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if (info->bmiHeader.biCompression == BI_BITFIELDS) {
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int bpp;
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Uint32 *masks;
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bpp = info->bmiHeader.biPlanes * info->bmiHeader.biBitCount;
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masks = (Uint32 *)((Uint8 *)info + info->bmiHeader.biSize);
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*format = SDL_MasksToPixelFormatEnum(bpp, masks[0], masks[1], masks[2], 0);
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}
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if (*format == SDL_PIXELFORMAT_UNKNOWN) {
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/* We'll use RGB format for now */
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*format = SDL_PIXELFORMAT_RGB888;
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/* Create a new one */
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SDL_memset(info, 0, size);
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info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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info->bmiHeader.biPlanes = 1;
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info->bmiHeader.biBitCount = 32;
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info->bmiHeader.biCompression = BI_RGB;
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}
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/* Fill in the size information */
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*pitch = (((w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
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info->bmiHeader.biWidth = w;
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info->bmiHeader.biHeight = -h; /* negative for topdown bitmap */
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info->bmiHeader.biSizeImage = (DWORD)h * (*pitch);
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data->mdc = CreateCompatibleDC(data->hdc);
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data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
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SDL_small_free(info, isstack);
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if (!data->hbm) {
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return WIN_SetError("Unable to create DIB");
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}
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SelectObject(data->mdc, data->hbm);
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return 0;
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}
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int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
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{
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SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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int i;
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for (i = 0; i < numrects; ++i) {
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BitBlt(data->hdc, rects[i].x, rects[i].y, rects[i].w, rects[i].h,
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data->mdc, rects[i].x, rects[i].y, SRCCOPY);
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}
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return 0;
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}
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void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
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{
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SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
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if (data == NULL) {
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/* The window wasn't fully initialized */
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return;
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}
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if (data->mdc) {
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DeleteDC(data->mdc);
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data->mdc = NULL;
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}
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if (data->hbm) {
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DeleteObject(data->hbm);
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data->hbm = NULL;
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}
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}
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#endif /* SDL_VIDEO_DRIVER_WINDOWS */
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/* vi: set ts=4 sw=4 expandtab: */
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