src/video/windowsrt/SDL_winrtframebuffer.c
author David Ludwig <dludwig@pobox.com>
Sat, 27 Oct 2012 22:48:04 -0400
changeset 8327 bc51589f33dc
permissions -rw-r--r--
WinRT: created a skeleton for a video driver, using a copy of the dummy driver for a base
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 #if SDL_VIDEO_DRIVER_WINRT
    24 
    25 #include "../SDL_sysvideo.h"
    26 #include "SDL_winrtframebuffer_c.h"
    27 
    28 
    29 #define WINRT_SURFACE   "_SDL_WinRTSurface"
    30 
    31 int SDL_WINRT_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
    32 {
    33     SDL_Surface *surface;
    34     const Uint32 surface_format = SDL_PIXELFORMAT_RGB888;
    35     int w, h;
    36     int bpp;
    37     Uint32 Rmask, Gmask, Bmask, Amask;
    38 
    39     /* Free the old framebuffer surface */
    40     surface = (SDL_Surface *) SDL_GetWindowData(window, WINRT_SURFACE);
    41     if (surface) {
    42         SDL_FreeSurface(surface);
    43     }
    44 
    45     /* Create a new one */
    46     SDL_PixelFormatEnumToMasks(surface_format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
    47     SDL_GetWindowSize(window, &w, &h);
    48     surface = SDL_CreateRGBSurface(0, w, h, bpp, Rmask, Gmask, Bmask, Amask);
    49     if (!surface) {
    50         return -1;
    51     }
    52 
    53     /* Save the info and return! */
    54     SDL_SetWindowData(window, WINRT_SURFACE, surface);
    55     *format = surface_format;
    56     *pixels = surface->pixels;
    57     *pitch = surface->pitch;
    58     return 0;
    59 }
    60 
    61 int SDL_WINRT_UpdateWindowFramebuffer(_THIS, SDL_Window * window, SDL_Rect * rects, int numrects)
    62 {
    63     static int frame_number;
    64     SDL_Surface *surface;
    65 
    66     surface = (SDL_Surface *) SDL_GetWindowData(window, WINRT_SURFACE);
    67     if (!surface) {
    68         SDL_SetError("Couldn't find WinRT surface for window");
    69         return -1;
    70     }
    71 
    72     /* Send the data to the display */
    73     if (SDL_getenv("SDL_VIDEO_WINRT_SAVE_FRAMES")) {
    74         char file[128];
    75         SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
    76                      SDL_GetWindowID(window), ++frame_number);
    77         SDL_SaveBMP(surface, file);
    78     }
    79     return 0;
    80 }
    81 
    82 void SDL_WINRT_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
    83 {
    84     SDL_Surface *surface;
    85 
    86     surface = (SDL_Surface *) SDL_SetWindowData(window, WINRT_SURFACE, NULL);
    87     if (surface) {
    88         SDL_FreeSurface(surface);
    89     }
    90 }
    91 
    92 #endif /* SDL_VIDEO_DRIVER_WINRT */
    93 
    94 /* vi: set ts=4 sw=4 expandtab: */