Mercurial > sdl-ios-xcode
annotate src/video/SDL_yuv.c @ 1840:c6a447c98584
Updated docs for SDL 1.2.10 release
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 16 May 2006 08:00:25 +0000 |
| parents | 51038e80ae59 |
| children | 782fd950bd46 9a7c62bbc8b3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 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 | |
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* This is the implementation of the YUV video surface support */ | |
| 25 | |
| 26 #include "SDL_video.h" | |
| 27 #include "SDL_sysvideo.h" | |
| 28 #include "SDL_yuvfuncs.h" | |
| 29 #include "SDL_yuv_sw_c.h" | |
| 30 | |
| 31 | |
| 32 SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format, | |
| 33 SDL_Surface *display) | |
| 34 { | |
| 35 SDL_VideoDevice *video = current_video; | |
| 36 SDL_VideoDevice *this = current_video; | |
| 37 const char *yuv_hwaccel; | |
| 38 SDL_Overlay *overlay; | |
| 39 | |
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40 if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) { |
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41 SDL_SetError("YUV overlays are not supported in OpenGL mode"); |
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42 return NULL; |
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43 } |
| 0 | 44 |
| 45 /* Display directly on video surface, if possible */ | |
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46 if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) { |
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47 if ( (display == SDL_PublicSurface) && |
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48 ((SDL_VideoSurface->format->BytesPerPixel == 2) || |
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49 (SDL_VideoSurface->format->BytesPerPixel == 4)) ) { |
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50 display = SDL_VideoSurface; |
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51 } |
| 0 | 52 } |
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53 overlay = NULL; |
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54 yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL"); |
| 0 | 55 if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) && |
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56 (!yuv_hwaccel || (SDL_atoi(yuv_hwaccel) > 0)) ) { |
| 0 | 57 overlay = video->CreateYUVOverlay(this, w, h, format, display); |
| 58 } | |
| 59 /* If hardware YUV overlay failed ... */ | |
| 60 if ( overlay == NULL ) { | |
| 61 overlay = SDL_CreateYUV_SW(this, w, h, format, display); | |
| 62 } | |
| 63 return overlay; | |
| 64 } | |
| 65 | |
| 66 int SDL_LockYUVOverlay(SDL_Overlay *overlay) | |
| 67 { | |
| 68 return overlay->hwfuncs->Lock(current_video, overlay); | |
| 69 } | |
| 70 | |
| 71 void SDL_UnlockYUVOverlay(SDL_Overlay *overlay) | |
| 72 { | |
| 73 overlay->hwfuncs->Unlock(current_video, overlay); | |
| 74 } | |
| 75 | |
| 76 int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect) | |
| 77 { | |
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78 SDL_Rect src, dst; |
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79 int srcx, srcy, srcw, srch; |
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80 int dstx, dsty, dstw, dsth; |
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81 |
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82 /* Clip the rectangle to the screen area */ |
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83 srcx = 0; |
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84 srcy = 0; |
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85 srcw = overlay->w; |
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86 srch = overlay->h; |
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87 dstx = dstrect->x; |
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88 dsty = dstrect->y; |
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89 dstw = dstrect->w; |
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90 dsth = dstrect->h; |
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91 if ( dstx < 0 ) { |
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92 srcw += (dstx * overlay->w) / dstrect->w; |
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93 dstw += dstx; |
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94 srcx -= (dstx * overlay->w) / dstrect->w; |
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95 dstx = 0; |
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96 } |
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97 if ( (dstx+dstw) > current_video->screen->w ) { |
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98 int extra = (dstx+dstw - current_video->screen->w); |
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99 srcw -= (extra * overlay->w) / dstrect->w; |
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100 dstw -= extra; |
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101 } |
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102 if ( dsty < 0 ) { |
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103 srch += (dsty * overlay->h) / dstrect->h; |
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104 dsth += dsty; |
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105 srcy -= (dsty * overlay->h) / dstrect->h; |
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106 dsty = 0; |
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107 } |
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108 if ( (dsty+dsth) > current_video->screen->h ) { |
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109 int extra = (dsty+dsth - current_video->screen->h); |
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110 srch -= (extra * overlay->h) / dstrect->h; |
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111 dsth -= extra; |
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112 } |
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113 if ( srcw <= 0 || srch <= 0 || |
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114 srch <= 0 || dsth <= 0 ) { |
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115 return 0; |
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116 } |
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117 /* Ugh, I can't wait for SDL_Rect to be int values */ |
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118 src.x = srcx; |
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119 src.y = srcy; |
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120 src.w = srcw; |
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121 src.h = srch; |
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122 dst.x = dstx; |
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123 dst.y = dsty; |
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124 dst.w = dstw; |
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125 dst.h = dsth; |
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126 return overlay->hwfuncs->Display(current_video, overlay, &src, &dst); |
| 0 | 127 } |
| 128 | |
| 129 void SDL_FreeYUVOverlay(SDL_Overlay *overlay) | |
| 130 { | |
| 131 if ( overlay ) { | |
| 132 if ( overlay->hwfuncs ) { | |
| 133 overlay->hwfuncs->FreeHW(current_video, overlay); | |
| 134 } | |
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135 SDL_free(overlay); |
| 0 | 136 } |
| 137 } |