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comparison src/video/dummy/SDL_nullframebuffer.c @ 5169:4d39eeaad00b

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Added a way to get a framebuffer interface for a window, and also a way to create a software renderer for an arbitrary surface. The software renderer has been re-routed to use the framebuffer interface, which makes it possible to have software rendering available even on simple ports.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 15:49:37 -0800
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children b530ef003506
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5168:2b1989f59674 5169:4d39eeaad00b
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2010 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #include "../SDL_sysvideo.h"
25
26
27 #define DUMMY_SURFACE "_SDL_DummySurface"
28
29 int SDL_DUMMY_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
30 {
31 SDL_Surface *surface;
32 const Uint32 surface_format = SDL_PIXELFORMAT_RGB888;
33 int w, h;
34 int bpp;
35 Uint32 Rmask, Gmask, Bmask, Amask;
36
37 /* Free the old framebuffer surface */
38 surface = (SDL_Surface *) SDL_GetWindowData(window, DUMMY_SURFACE);
39 if (surface) {
40 SDL_FreeSurface(surface);
41 }
42
43 /* Create a new one */
44 SDL_PixelFormatEnumToMasks(surface_format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
45 SDL_GetWindowSize(window, &w, &h);
46 surface = SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask);
47 if (!surface) {
48 return -1;
49 }
50
51 /* Save the info and return! */
52 SDL_SetWindowData(window, DUMMY_SURFACE, surface);
53 *format = surface_format;
54 *pixels = surface->pixels;
55 *pitch = surface->pitch;
56 return 0;
57 }
58
59 int SDL_DUMMY_UpdateWindowFramebuffer(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects)
60 {
61 static int frame_number;
62 SDL_Surface *surface;
63
64 surface = (SDL_Surface *) SDL_GetWindowData(window, DUMMY_SURFACE);
65 if (!surface) {
66 SDL_SetError("Couldn't find dummy surface for window");
67 return -1;
68 }
69
70 /* Send the data to the display */
71 if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
72 char file[128];
73 SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
74 SDL_GetWindowID(window), ++frame_number);
75 SDL_SaveBMP(surface, file);
76 }
77 return 0;
78 }
79
80 void SDL_DUMMY_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
81 {
82 SDL_Surface *surface;
83
84 surface = (SDL_Surface *) SDL_SetWindowData(window, DUMMY_SURFACE, NULL);
85 if (surface) {
86 SDL_FreeSurface(surface);
87 }
88 }
89
90 /* vi: set ts=4 sw=4 expandtab: */