Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_VideoInfo.3 @ 1543:98f9b16f565c
From: "Alex Volkov"
Date: Thu, 10 Nov 2005 21:53:40 -0500
Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA
It seems there is either a documentation vs. reality mismatch or a real bug
in SDL_blit_N.c:BlitNtoNKey().
The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY
and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states:
* RGBA->RGB:
* SDL_SRCALPHA not set:
* copy RGB.
* if SDL_SRCCOLORKEY set, only copy the pixels matching the
* RGB values of the source colour key, ignoring alpha in the
* comparison.
BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The
documentation makes perfect sense, so I think it is the code that is faulty.
The attached patch corrects the code.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Mar 2006 15:43:15 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_VideoInfo" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_VideoInfo\- Video Target information | |
| 4 .SH "STRUCTURE DEFINITION" | |
| 5 .PP | |
| 6 .nf | |
| 7 \f(CWtypedef struct{ | |
| 8 Uint32 hw_available:1; | |
| 9 Uint32 wm_available:1; | |
| 10 Uint32 blit_hw:1; | |
| 11 Uint32 blit_hw_CC:1; | |
| 12 Uint32 blit_hw_A:1; | |
| 13 Uint32 blit_sw:1; | |
| 14 Uint32 blit_sw_CC:1; | |
| 15 Uint32 blit_sw_A:1; | |
| 16 Uint32 blit_fill; | |
| 17 Uint32 video_mem; | |
| 18 SDL_PixelFormat *vfmt; | |
| 19 } SDL_VideoInfo;\fR | |
| 20 .fi | |
| 21 .PP | |
| 22 .SH "STRUCTURE DATA" | |
| 23 .TP 20 | |
| 24 \fBhw_available\fR | |
| 25 Is it possible to create hardware surfaces? | |
| 26 .TP 20 | |
| 27 \fBwm_available\fR | |
| 28 Is there a window manager available | |
| 29 .TP 20 | |
| 30 \fBblit_hw\fR | |
| 31 Are hardware to hardware blits accelerated? | |
| 32 .TP 20 | |
| 33 \fBblit_hw_CC\fR | |
| 34 Are hardware to hardware colorkey blits accelerated? | |
| 35 .TP 20 | |
| 36 \fBblit_hw_A\fR | |
| 37 Are hardware to hardware alpha blits accelerated? | |
| 38 .TP 20 | |
| 39 \fBblit_sw\fR | |
| 40 Are software to hardware blits accelerated? | |
| 41 .TP 20 | |
| 42 \fBblit_sw_CC\fR | |
| 43 Are software to hardware colorkey blits accelerated? | |
| 44 .TP 20 | |
| 45 \fBblit_sw_A\fR | |
| 46 Are software to hardware alpha blits accelerated? | |
| 47 .TP 20 | |
| 48 \fBblit_fill\fR | |
| 49 Are color fills accelerated? | |
| 50 .TP 20 | |
| 51 \fBvideo_mem\fR | |
| 52 Total amount of video memory in Kilobytes | |
| 53 .TP 20 | |
| 54 \fBvfmt\fR | |
| 55 \fIPixel format\fR of the video device | |
| 56 .SH "DESCRIPTION" | |
| 57 .PP | |
| 58 This (read-only) structure is returned by \fI\fBSDL_GetVideoInfo\fP\fR\&. It contains information on either the \&'best\&' available mode (if called before \fI\fBSDL_SetVideoMode\fP\fR) or the current video mode\&. | |
| 59 .SH "SEE ALSO" | |
| 60 .PP | |
| 61 \fI\fBSDL_PixelFormat\fR\fR, \fI\fBSDL_GetVideoInfo\fP\fR | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
62 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |