Mercurial > sdl-ios-xcode
annotate include/SDL_rwops.h @ 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 |
| parents | b8d311d90021 |
| children | 02759105b989 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This file provides a general interface for SDL to read and write | |
| 29 data sources. It can easily be extended to files, memory, etc. | |
| 30 */ | |
| 31 | |
| 32 #ifndef _SDL_RWops_h | |
| 33 #define _SDL_RWops_h | |
| 34 | |
| 35 #include <stdio.h> | |
| 36 | |
| 37 #include "SDL_types.h" | |
| 38 | |
| 39 #include "begin_code.h" | |
| 40 /* Set up for C function definitions, even when using C++ */ | |
| 41 #ifdef __cplusplus | |
| 42 extern "C" { | |
| 43 #endif | |
| 44 | |
| 45 /* This is the read/write operation structure -- very basic */ | |
| 46 | |
| 47 typedef struct SDL_RWops { | |
| 48 /* Seek to 'offset' relative to whence, one of stdio's whence values: | |
| 49 SEEK_SET, SEEK_CUR, SEEK_END | |
| 50 Returns the final offset in the data source. | |
| 51 */ | |
| 52 int (*seek)(struct SDL_RWops *context, int offset, int whence); | |
| 53 | |
| 54 /* Read up to 'num' objects each of size 'objsize' from the data | |
| 55 source to the area pointed at by 'ptr'. | |
| 56 Returns the number of objects read, or -1 if the read failed. | |
| 57 */ | |
| 58 int (*read)(struct SDL_RWops *context, void *ptr, int size, int maxnum); | |
| 59 | |
| 60 /* Write exactly 'num' objects each of size 'objsize' from the area | |
| 61 pointed at by 'ptr' to data source. | |
| 62 Returns 'num', or -1 if the write failed. | |
| 63 */ | |
| 64 int (*write)(struct SDL_RWops *context, const void *ptr, int size, int num); | |
| 65 | |
| 66 /* Close and free an allocated SDL_FSops structure */ | |
| 67 int (*close)(struct SDL_RWops *context); | |
| 68 | |
| 69 Uint32 type; | |
| 70 union { | |
| 71 struct { | |
| 72 int autoclose; | |
| 73 FILE *fp; | |
| 74 } stdio; | |
| 75 struct { | |
| 76 Uint8 *base; | |
| 77 Uint8 *here; | |
| 78 Uint8 *stop; | |
| 79 } mem; | |
| 80 struct { | |
| 81 void *data1; | |
| 82 } unknown; | |
| 83 } hidden; | |
| 84 | |
| 85 } SDL_RWops; | |
| 86 | |
| 87 | |
| 88 /* Functions to create SDL_RWops structures from various data sources */ | |
| 89 | |
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90 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode); |
| 0 | 91 |
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92 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose); |
| 0 | 93 |
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94 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size); |
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Added function to create RWops from const memory: SDL_RWFromConstMem()
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95 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size); |
| 0 | 96 |
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97 extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void); |
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98 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area); |
| 0 | 99 |
| 100 /* Macros to easily read and write from an SDL_RWops structure */ | |
| 101 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) | |
| 102 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, SEEK_CUR) | |
| 103 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) | |
| 104 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) | |
| 105 #define SDL_RWclose(ctx) (ctx)->close(ctx) | |
| 106 | |
| 107 | |
| 108 /* Ends C function definitions when using C++ */ | |
| 109 #ifdef __cplusplus | |
| 110 } | |
| 111 #endif | |
| 112 #include "close_code.h" | |
| 113 | |
| 114 #endif /* _SDL_RWops_h */ |