Mercurial > sdl-ios-xcode
annotate src/video/windows/SDL_windowsframebuffer.c @ 5179:6d37aa594ecd
Use the exact format of the window if possible, for speed.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 04 Feb 2011 13:47:02 -0800 |
parents | 9b2e99ebd099 |
children | 4191af605cb0 |
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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 #define HAVE_GETDIBITS |
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27 |
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28 int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch) |
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29 { |
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30 SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
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31 size_t size; |
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32 LPBITMAPINFO info; |
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33 #ifdef HAVE_GETDIBITS |
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34 HBITMAP hbm; |
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35 #endif |
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36 |
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37 /* Free the old framebuffer surface */ |
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38 if (data->mdc) { |
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39 DeleteDC(data->mdc); |
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40 } |
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41 if (data->hbm) { |
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42 DeleteObject(data->hbm); |
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43 } |
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44 |
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45 /* Find out the format of the screen */ |
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46 size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD); |
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47 info = (LPBITMAPINFO)SDL_stack_alloc(Uint8, size); |
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48 |
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49 #ifdef HAVE_GETDIBITS |
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50 SDL_memset(info, 0, size); |
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51 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); |
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52 |
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53 /* The second call to GetDIBits() fills in the bitfields */ |
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54 hbm = CreateCompatibleBitmap(data->hdc, 1, 1); |
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55 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS); |
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56 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS); |
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57 DeleteObject(hbm); |
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58 |
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59 *format = SDL_PIXELFORMAT_UNKNOWN; |
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60 if (info->bmiHeader.biCompression == BI_BITFIELDS) { |
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61 Uint32 *masks; |
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62 |
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63 masks = (Uint32*)((Uint8*)info + info->bmiHeader.biSize); |
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64 if (masks[0] == 0x00FF0000 && masks[2] == 0x000000FF) { |
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65 *format = SDL_PIXELFORMAT_RGB888; |
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66 } else if (masks[0] == 0x000000FF && masks[2] == 0x00FF0000) { |
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67 *format = SDL_PIXELFORMAT_BGR888; |
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68 } else if (masks[0] == 0xF800 && masks[2] == 0x001F) { |
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69 *format = SDL_PIXELFORMAT_RGB565; |
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70 } else if (masks[0] == 0x001F && masks[2] == 0xF800) { |
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71 *format = SDL_PIXELFORMAT_BGR565; |
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72 } else if (masks[0] == 0x7C00 && masks[2] == 0x001F) { |
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73 *format = SDL_PIXELFORMAT_RGB555; |
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74 } else if (masks[0] == 0x001F && masks[2] == 0x7C00) { |
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75 *format = SDL_PIXELFORMAT_BGR555; |
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76 } |
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77 } |
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78 if (*format == SDL_PIXELFORMAT_UNKNOWN) |
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79 #endif |
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80 { |
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81 /* We'll use RGB format for now */ |
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82 *format = SDL_PIXELFORMAT_RGB888; |
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83 |
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84 /* Create a new one */ |
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85 SDL_memset(info, 0, size); |
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86 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); |
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87 info->bmiHeader.biPlanes = 1; |
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88 info->bmiHeader.biBitCount = 32; |
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89 info->bmiHeader.biCompression = BI_RGB; |
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90 } |
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91 |
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92 /* Fill in the size information */ |
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93 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3); |
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94 info->bmiHeader.biWidth = window->w; |
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95 info->bmiHeader.biHeight = -window->h; /* negative for topdown bitmap */ |
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96 info->bmiHeader.biSizeImage = window->h * (*pitch); |
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97 |
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98 data->mdc = CreateCompatibleDC(data->hdc); |
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99 data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0); |
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100 SDL_stack_free(info); |
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101 |
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102 if (!data->hbm) { |
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103 WIN_SetError("Unable to create DIB"); |
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104 return -1; |
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105 } |
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106 SelectObject(data->mdc, data->hbm); |
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107 |
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108 return 0; |
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109 } |
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110 |
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111 int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects) |
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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 BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY); |
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116 return 0; |
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117 } |
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118 |
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119 void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window) |
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120 { |
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121 SDL_WindowData *data = (SDL_WindowData *) window->driverdata; |
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122 |
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123 if (data->mdc) { |
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124 DeleteDC(data->mdc); |
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125 data->mdc = NULL; |
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126 } |
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127 if (data->hbm) { |
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128 DeleteObject(data->hbm); |
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129 data->hbm = NULL; |
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130 } |
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131 } |
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132 |
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133 /* vi: set ts=4 sw=4 expandtab: */ |