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annotate src/video/windows/SDL_windowsframebuffer.c @ 5194:93052810ceb5

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Allow SDL_HINT_FRAMEBUFFER_ACCELERATION to specify the renderer to use.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 05 Feb 2011 10:11:27 -0800
parents d2652aafafbb
children b530ef003506
rev   line source
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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 #ifndef _WIN32_WCE
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27 #define HAVE_GETDIBITS
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28 #endif
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29
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30 int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
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31 {
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32 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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33 size_t size;
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34 LPBITMAPINFO info;
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35 #ifdef HAVE_GETDIBITS
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36 HBITMAP hbm;
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37 #endif
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38
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39 /* Free the old framebuffer surface */
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40 if (data->mdc) {
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41 DeleteDC(data->mdc);
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42 }
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43 if (data->hbm) {
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44 DeleteObject(data->hbm);
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45 }
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46
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47 /* Find out the format of the screen */
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48 size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD);
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49 info = (LPBITMAPINFO)SDL_stack_alloc(Uint8, size);
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50
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51 #ifdef HAVE_GETDIBITS
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52 SDL_memset(info, 0, size);
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53 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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54
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55 /* The second call to GetDIBits() fills in the bitfields */
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56 hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
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57 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
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58 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
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59 DeleteObject(hbm);
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60
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61 *format = SDL_PIXELFORMAT_UNKNOWN;
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62 if (info->bmiHeader.biCompression == BI_BITFIELDS) {
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63 int bpp;
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64 Uint32 *masks;
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65
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66 bpp = info->bmiHeader.biPlanes * info->bmiHeader.biBitCount;
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67 masks = (Uint32*)((Uint8*)info + info->bmiHeader.biSize);
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68 *format = SDL_MasksToPixelFormatEnum(bpp, masks[0], masks[1], masks[2], 0);
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69 }
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70 if (*format == SDL_PIXELFORMAT_UNKNOWN)
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71 #endif
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72 {
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73 /* We'll use RGB format for now */
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74 *format = SDL_PIXELFORMAT_RGB888;
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75
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76 /* Create a new one */
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77 SDL_memset(info, 0, size);
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78 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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79 info->bmiHeader.biPlanes = 1;
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80 info->bmiHeader.biBitCount = 32;
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81 info->bmiHeader.biCompression = BI_RGB;
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82 }
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83
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84 /* Fill in the size information */
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85 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
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86 info->bmiHeader.biWidth = window->w;
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87 info->bmiHeader.biHeight = -window->h; /* negative for topdown bitmap */
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88 info->bmiHeader.biSizeImage = window->h * (*pitch);
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89
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90 data->mdc = CreateCompatibleDC(data->hdc);
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91 data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
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92 SDL_stack_free(info);
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93
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94 if (!data->hbm) {
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95 WIN_SetError("Unable to create DIB");
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96 return -1;
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97 }
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98 SelectObject(data->mdc, data->hbm);
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99
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100 return 0;
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101 }
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102
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103 int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects)
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104 {
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105 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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106
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107 BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
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108 return 0;
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109 }
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110
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111 void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
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112 {
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113 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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114
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115 if (data->mdc) {
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116 DeleteDC(data->mdc);
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117 data->mdc = NULL;
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118 }
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119 if (data->hbm) {
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120 DeleteObject(data->hbm);
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121 data->hbm = NULL;
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122 }
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123 }
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124
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125 /* vi: set ts=4 sw=4 expandtab: */