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