Mercurial > sdl-ios-xcode
annotate VisualCE/SDL.vcw @ 3333:b334b4f7dfa0
[SDL] Bad math in SDL_RenderCopy
Mason Wheeler to sdl
When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this:
if (dstrect->w != real_dstrect.w) {
int deltax = (dstrect->x - real_dstrect.x);
int deltaw = (dstrect->w - real_dstrect.w);
real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w;
real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w;
}
if (dstrect->h != real_dstrect.h) {
int deltay = (dstrect->y - real_dstrect.y);
int deltah = (dstrect->h - real_dstrect.h);
real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h;
real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 03 Oct 2009 16:23:16 +0000 |
parents | d63e9f5944ae |
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1 Microsoft eMbedded Visual Tools Workspace File, Format Version 3.00 |
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2 # WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE! |
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3 |
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4 ############################################################################### |
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5 |
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6 Project: "loopwave"=.\loopwave\loopwave.vcp - Package Owner=<4> |
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7 |
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8 Package=<5> |
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9 {{{ |
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10 }}} |
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11 |
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12 Package=<4> |
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13 {{{ |
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14 Begin Project Dependency |
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15 Project_Dep_Name SDL |
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16 End Project Dependency |
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17 Begin Project Dependency |
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18 Project_Dep_Name SDLmain |
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19 End Project Dependency |
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20 }}} |
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21 |
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22 ############################################################################### |
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23 |
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24 Project: "SDL"=.\SDL\SDL.VCP - Package Owner=<4> |
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25 |
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26 Package=<5> |
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27 {{{ |
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28 }}} |
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29 |
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30 Package=<4> |
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31 {{{ |
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32 }}} |
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33 |
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34 ############################################################################### |
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35 |
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36 Project: "SDLmain"=.\SDLmain\SDLmain.vcp - Package Owner=<4> |
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37 |
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38 Package=<5> |
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39 {{{ |
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40 }}} |
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41 |
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42 Package=<4> |
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43 {{{ |
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44 Begin Project Dependency |
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45 Project_Dep_Name SDL |
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46 End Project Dependency |
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47 }}} |
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48 |
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49 ############################################################################### |
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50 |
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51 Project: "testtimer"=.\testtimer\testtimer.vcp - Package Owner=<4> |
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53 Package=<5> |
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54 {{{ |
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55 }}} |
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57 Package=<4> |
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58 {{{ |
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59 Begin Project Dependency |
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60 Project_Dep_Name SDL |
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61 End Project Dependency |
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62 Begin Project Dependency |
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63 Project_Dep_Name SDLmain |
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64 End Project Dependency |
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65 }}} |
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66 |
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67 ############################################################################### |
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68 |
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69 Project: "testalpha"=.\testalpha\testalpha.vcp - Package Owner=<4> |
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71 Package=<5> |
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72 {{{ |
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73 }}} |
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75 Package=<4> |
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76 {{{ |
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77 Begin Project Dependency |
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78 Project_Dep_Name SDL |
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79 End Project Dependency |
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80 Begin Project Dependency |
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81 Project_Dep_Name SDLmain |
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82 End Project Dependency |
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83 }}} |
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84 |
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85 ############################################################################### |
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87 Project: "testwin"=.\testwin\testwin.vcp - Package Owner=<4> |
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89 Package=<5> |
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90 {{{ |
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91 }}} |
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93 Package=<4> |
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94 {{{ |
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95 Begin Project Dependency |
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96 Project_Dep_Name SDL |
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97 End Project Dependency |
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98 Begin Project Dependency |
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99 Project_Dep_Name SDLmain |
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100 End Project Dependency |
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101 }}} |
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102 |
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103 ############################################################################### |
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105 Global: |
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107 Package=<5> |
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108 {{{ |
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109 }}} |
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110 |
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111 Package=<3> |
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112 {{{ |
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113 }}} |
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115 ############################################################################### |
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116 |