Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_UpdateRects.3 @ 1257:448a9a64537b
[PATCH] SDL_GetVideoMode() does not find best mode, part 2
Following commit 1.51, I come accross a problem when SDL must choose between
several video modes that could suit the one asked.
If I ask 320x240 with this list:
768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200
The smallest selectables modes are 384x240 and 320x400. And SDL choose the later
in this list, but 384x240 is more suitable. So I added a check to compare
the pixel count (surface) of modes, and select the one which has the smallest
pixel count.
In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now
SDL will choose 384x240 for the asked 320x240 mode.
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 19 Jan 2006 21:28:52 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
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e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
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1 .TH "SDL_UpdateRects" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_UpdateRects\- Makes sure the given list of rectangles is updated on the given screen\&. | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBvoid \fBSDL_UpdateRects\fP\fR(\fBSDL_Surface *screen, int numrects, SDL_Rect *rects\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
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11 Makes sure the given list of rectangles is updated on the given screen\&. The rectangles must all be confined within the screen boundaries (no clipping is done)\&. |
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12 .PP |
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13 This function should not be called while \fBscreen\fR is \fIlocked\fR\&. |
| 0 | 14 .PP |
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15 .RS |
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Sam Lantinga <slouken@lokigames.com>
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16 \fBNote: |
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Sam Lantinga <slouken@lokigames.com>
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17 .PP |
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Sam Lantinga <slouken@lokigames.com>
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18 It is adviced to call this function only once per frame, since each call has some processing overhead\&. This is no restriction since you can pass any number of rectangles each time\&. |
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Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
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19 .PP |
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Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
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20 The rectangles are not automatically merged or checked for overlap\&. In general, the programmer can use his knowledge about his particular rectangles to merge them in an efficient way, to avoid overdraw\&. |
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55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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21 .RE |
| 0 | 22 .SH "SEE ALSO" |
| 23 .PP | |
| 24 \fI\fBSDL_UpdateRect\fP\fR, \fI\fBSDL_Rect\fR\fR, \fI\fBSDL_Surface\fR\fR, \fI\fBSDL_LockSurface\fP\fR | |
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Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
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25 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |