src/video/mir/SDL_mirframebuffer.c
author Ryan C. Gordon <icculus@icculus.org>
Mon, 03 Feb 2014 11:52:54 -0500
changeset 8159 427e8fdf6f69
parent 8157 f5d262613ed2
child 8300 8393682d9d96
permissions -rw-r--r--
Hooked up dynamic loading for Mir.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 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 
    22 /*
    23   Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
    24 */
    25 
    26 #include "../../SDL_internal.h"
    27 
    28 #if SDL_VIDEO_DRIVER_MIR
    29 
    30 #include "SDL_mirevents.h"
    31 #include "SDL_mirframebuffer.h"
    32 #include "SDL_mirwindow.h"
    33 
    34 #include "SDL_mirdyn.h"
    35 
    36 static const Uint32 mir_pixel_format_to_sdl_format[] = {
    37     SDL_PIXELFORMAT_UNKNOWN,  /* mir_pixel_format_invalid   */
    38     SDL_PIXELFORMAT_ABGR8888, /* mir_pixel_format_abgr_8888 */
    39     SDL_PIXELFORMAT_BGR888,   /* mir_pixel_format_xbgr_8888 */
    40     SDL_PIXELFORMAT_ARGB8888, /* mir_pixel_format_argb_8888 */
    41     SDL_PIXELFORMAT_RGB888,   /* mir_pixel_format_xrgb_8888 */
    42     SDL_PIXELFORMAT_BGR24     /* mir_pixel_format_bgr_888   */
    43 };
    44 
    45 Uint32
    46 MIR_GetSDLPixelFormat(MirPixelFormat format)
    47 {
    48     return mir_pixel_format_to_sdl_format[format];
    49 }
    50 
    51 int
    52 MIR_CreateWindowFramebuffer(_THIS, SDL_Window* window, Uint32* format,
    53                             void** pixels, int* pitch)
    54 {
    55     MIR_Data* mir_data = _this->driverdata;
    56     MIR_Window* mir_window;
    57     MirSurfaceParameters surfaceparm;
    58 
    59     if (MIR_CreateWindow(_this, window) < 0)
    60         return SDL_SetError("Failed to created a mir window.");
    61 
    62     mir_window = window->driverdata;
    63 
    64     MIR_mir_surface_get_parameters(mir_window->surface, &surfaceparm);
    65 
    66     *format = MIR_GetSDLPixelFormat(surfaceparm.pixel_format);
    67     if (*format == SDL_PIXELFORMAT_UNKNOWN)
    68         return SDL_SetError("Unknown pixel format");
    69 
    70     *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
    71 
    72     *pixels = SDL_malloc(window->h*(*pitch));
    73     if (*pixels == NULL)
    74         return SDL_OutOfMemory();
    75 
    76     mir_window->surface = MIR_mir_connection_create_surface_sync(mir_data->connection, &surfaceparm);
    77     if (!MIR_mir_surface_is_valid(mir_window->surface)) {
    78         const char* error = MIR_mir_surface_get_error_message(mir_window->surface);
    79         return SDL_SetError("Failed to created a mir surface: %s", error);
    80     }
    81 
    82     return 0;
    83 }
    84 
    85 int
    86 MIR_UpdateWindowFramebuffer(_THIS, SDL_Window* window,
    87                             const SDL_Rect* rects, int numrects)
    88 {
    89     MIR_Window* mir_window = window->driverdata;
    90 
    91     MirGraphicsRegion region;
    92     int i, j, x, y, w, h, start;
    93     int bytes_per_pixel, bytes_per_row, s_stride, d_stride;
    94 
    95     MIR_mir_surface_get_graphics_region(mir_window->surface, &region);
    96 
    97     char* s_dest = region.vaddr;
    98     char* pixels = (char*)window->surface->pixels;
    99 
   100     s_stride = window->surface->pitch;
   101     d_stride = region.stride;
   102     bytes_per_pixel = window->surface->format->BytesPerPixel;
   103 
   104     for (i = 0; i < numrects; i++) {
   105         s_dest = region.vaddr;
   106         pixels = (char*)window->surface->pixels;
   107 
   108         x = rects[i].x;
   109         y = rects[i].y;
   110         w = rects[i].w;
   111         h = rects[i].h;
   112 
   113         if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0)
   114             continue;
   115 
   116         if (x < 0) {
   117             x += w;
   118             w += rects[i].x;
   119         }
   120 
   121         if (y < 0) {
   122             y += h;
   123             h += rects[i].y;
   124         }
   125 
   126         if (x + w > window->w)
   127             w = window->w - x;
   128         if (y + h > window->h)
   129             h = window->h - y;
   130 
   131         start = y * s_stride + x;
   132         pixels += start;
   133         s_dest += start;
   134 
   135         bytes_per_row =  bytes_per_pixel * w;
   136         for (j = 0; j < h; j++) {
   137             memcpy(s_dest, pixels, bytes_per_row);
   138             pixels += s_stride;
   139             s_dest += d_stride;
   140         }
   141     }
   142 
   143     MIR_mir_surface_swap_buffers_sync(mir_window->surface);
   144 
   145     return 0;
   146 }
   147 
   148 void
   149 MIR_DestroyWindowFramebuffer(_THIS, SDL_Window* window)
   150 {
   151 }
   152 
   153 #endif /* SDL_VIDEO_DRIVER_MIR */
   154 
   155 /* vi: set ts=4 sw=4 expandtab: */