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src/libm/math_libm.h

author | Sam Lantinga <slouken@libsdl.org> |

Fri, 29 May 2020 21:26:32 -0700 | |

changeset 13884 | ba1ed72249c0 |

parent 13422 | fd6a12de91c7 |

permissions | -rw-r--r-- |

Fixed bug 5113 - SDL_UpdateWindowSurfaceRects BitBlt the entire surface on Win32

Ryan C. Gordon

As discussed here:

https://discourse.libsdl.org/t/question-about-implementation-of-sdl-updatewindowsurfacerects/27561

"As you can see this function [WIN_UpdateWindowFramebuffer, in src/video/windows/SDL_windowsframebuffer.c] calls BitBlt on entire screen, even though it accepts the rects. Rects variable is not even used in this function at all. Now my question is why is that the case?"

Ryan C. Gordon

As discussed here:

https://discourse.libsdl.org/t/question-about-implementation-of-sdl-updatewindowsurfacerects/27561

"As you can see this function [WIN_UpdateWindowFramebuffer, in src/video/windows/SDL_windowsframebuffer.c] calls BitBlt on entire screen, even though it accepts the rects. Rects variable is not even used in this function at all. Now my question is why is that the case?"

1 /*

2 Simple DirectMedia Layer

3 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

5 This software is provided 'as-is', without any express or implied

6 warranty. In no event will the authors be held liable for any damages

7 arising from the use of this software.

9 Permission is granted to anyone to use this software for any purpose,

10 including commercial applications, and to alter it and redistribute it

11 freely, subject to the following restrictions:

13 1. The origin of this software must not be misrepresented; you must not

14 claim that you wrote the original software. If you use this software

15 in a product, an acknowledgment in the product documentation would be

16 appreciated but is not required.

17 2. Altered source versions must be plainly marked as such, and must not be

18 misrepresented as being the original software.

19 3. This notice may not be removed or altered from any source distribution.

20 */

22 #ifndef math_libm_h_

23 #define math_libm_h_

25 #include "../SDL_internal.h"

27 /* Math routines from uClibc: http://www.uclibc.org */

29 double SDL_uclibc_atan(double x);

30 double SDL_uclibc_atan2(double y, double x);

31 double SDL_uclibc_copysign(double x, double y);

32 double SDL_uclibc_cos(double x);

33 double SDL_uclibc_exp(double x);

34 double SDL_uclibc_fabs(double x);

35 double SDL_uclibc_floor(double x);

36 double SDL_uclibc_fmod(double x, double y);

37 double SDL_uclibc_log(double x);

38 double SDL_uclibc_log10(double x);

39 double SDL_uclibc_pow(double x, double y);

40 double SDL_uclibc_scalbn(double x, int n);

41 double SDL_uclibc_sin(double x);

42 double SDL_uclibc_sqrt(double x);

43 double SDL_uclibc_tan(double x);

45 #endif /* math_libm_h_ */

47 /* vi: set ts=4 sw=4 expandtab: */