annotate docs/man3/SDL_CreateRGBSurface.3 @ 821:30168104389f

Date: Sat, 14 Feb 2004 14:52:40 +0200 From: "Mike Gorchak" Subject: Batch of the QNX6 fixes for the SDL 1. Updated readme.QNX 2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update). 3. Fixed double-buffered fullscreen modes, now it works as needed. 4. Fixed Photon detection algorithm. 5. Fixed HWSURFACE update function. 6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon. 7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode. 8. Added available video ram amount support. 8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it. 9. Added hardware filling support. 10. Added hardware blits support (simple and colorkeyed). And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 14 Feb 2004 20:22:21 +0000
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children 546f7c1eb755
rev   line source
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1 .TH "SDL_CreateRGBSurface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_CreateRGBSurface\- Create an empty SDL_Surface
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBSDL_Surface *\fBSDL_CreateRGBSurface\fP\fR(\fBUint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 Allocate an empty surface (must be called after \fISDL_SetVideoMode\fR)
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12 .PP
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13 If \fBdepth\fR is 8 bits an empty palette is allocated for the surface, otherwise a \&'packed-pixel\&' \fI\fBSDL_PixelFormat\fR\fR is created using the \fB[RGBA]mask\fR\&'s provided (see \fI\fBSDL_PixelFormat\fR\fR)\&. The \fBflags\fR specifies the type of surface that should be created, it is an OR\&'d combination of the following possible values\&.
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14 .TP 20
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15 \fBSDL_SWSURFACE\fP
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16 SDL will create the surface in system memory\&. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting\&.
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17 .TP 20
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18 \fBSDL_HWSURFACE\fP
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19 SDL will attempt to create the surface in video memory\&. This will allow SDL to take advantage of Video->Video blits (which are often accelerated)\&.
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20 .TP 20
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21 \fBSDL_SRCCOLORKEY\fP
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22 This flag turns on colourkeying for blits from this surface\&. If \fBSDL_HWSURFACE\fP is also specified and colourkeyed blits are hardware-accelerated, then SDL will attempt to place the surface in video memory\&. Use \fI\fBSDL_SetColorKey\fP\fR to set or clear this flag after surface creation\&.
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23 .TP 20
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24 \fBSDL_SRCALPHA\fP
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25 This flag turns on alpha-blending for blits from this surface\&. If \fBSDL_HWSURFACE\fP is also specified and alpha-blending blits are hardware-accelerated, then the surface will be placed in video memory if possible\&. Use \fI\fBSDL_SetAlpha\fP\fR to set or clear this flag after surface creation\&.
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26 .PP
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27 .RS
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28 \fBNote:
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29 .PP
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30 If an alpha-channel is specified (that is, if \fBAmask\fR is nonzero), then the \fBSDL_SRCALPHA\fP flag is automatically set\&. You may remove this flag by calling \fI\fBSDL_SetAlpha\fP\fR after surface creation\&.
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31 .RE
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32 .SH "RETURN VALUE"
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33 .PP
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34 Returns the created surface, or \fBNULL\fR upon error\&.
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35 .SH "EXAMPLE"
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36 .PP
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37 .nf
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38 \f(CW /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
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39 as expected by OpenGL for textures */
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40 SDL_Surface *surface;
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41 Uint32 rmask, gmask, bmask, amask;
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42
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43 /* SDL interprets each pixel as a 32-bit number, so our masks must depend
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44 on the endianness (byte order) of the machine */
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45 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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46 rmask = 0xff000000;
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47 gmask = 0x00ff0000;
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48 bmask = 0x0000ff00;
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49 amask = 0x000000ff;
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50 #else
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51 rmask = 0x000000ff;
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52 gmask = 0x0000ff00;
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53 bmask = 0x00ff0000;
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54 amask = 0xff000000;
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55 #endif
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56
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57 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
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58 rmask, gmask, bmask, amask);
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59 if(surface == NULL) {
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60 fprintf(stderr, "CreateRGBSurface failed: %s
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61 ", SDL_GetError());
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62 exit(1);
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63 }\fR
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64 .fi
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65 .PP
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66 .SH "SEE ALSO"
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67 .PP
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68 \fI\fBSDL_CreateRGBSurfaceFrom\fP\fR, \fI\fBSDL_FreeSurface\fP\fR, \fI\fBSDL_SetVideoMode\fP\fR, \fI\fBSDL_LockSurface\fP\fR, \fI\fBSDL_PixelFormat\fR\fR, \fI\fBSDL_Surface\fR\fR \fI\fBSDL_SetAlpha\fP\fR \fI\fBSDL_SetColorKey\fP\fR
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69 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01