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comparison src/video/windows/SDL_windowsframebuffer.c @ 5178:9b2e99ebd099

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Added the Windows framebuffer implementation. This actually ends up being faster than Direct3D with a dynamic texture. (???)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 04 Feb 2011 12:29:58 -0800
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children 6d37aa594ecd
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5177:b9cf75615028 5178:9b2e99ebd099
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2010 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "SDL_windowsvideo.h"
25
26
27 int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
28 {
29 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
30 BITMAPINFO info;
31
32 /* Free the old framebuffer surface */
33 if (data->mdc) {
34 DeleteDC(data->mdc);
35 }
36 if (data->hbm) {
37 DeleteObject(data->hbm);
38 }
39
40 /* We'll use RGB format for now */
41 *format = SDL_PIXELFORMAT_RGB888;
42 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
43
44 /* Create a new one */
45 info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
46 info.bmiHeader.biWidth = window->w;
47 info.bmiHeader.biHeight = -window->h; /* negative for topdown bitmap */
48 info.bmiHeader.biPlanes = 1;
49 info.bmiHeader.biBitCount = 32;
50 info.bmiHeader.biCompression = BI_RGB;
51 info.bmiHeader.biSizeImage = window->h * (*pitch);
52 info.bmiHeader.biXPelsPerMeter = 0;
53 info.bmiHeader.biYPelsPerMeter = 0;
54 info.bmiHeader.biClrUsed = 0;
55 info.bmiHeader.biClrImportant = 0;
56
57 data->mdc = CreateCompatibleDC(data->hdc);
58 data->hbm = CreateDIBSection(data->hdc, &info, DIB_RGB_COLORS, pixels, NULL, 0);
59 if (!data->hbm) {
60 WIN_SetError("Unable to create DIB");
61 return -1;
62 }
63 SelectObject(data->mdc, data->hbm);
64
65 return 0;
66 }
67
68 int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects)
69 {
70 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
71
72 BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
73 return 0;
74 }
75
76 void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
77 {
78 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
79
80 if (data->mdc) {
81 DeleteDC(data->mdc);
82 data->mdc = NULL;
83 }
84 if (data->hbm) {
85 DeleteObject(data->hbm);
86 data->hbm = NULL;
87 }
88 }
89
90 /* vi: set ts=4 sw=4 expandtab: */