src/video/mir/SDL_mirframebuffer.c
author Brandon Schaefer <brandon.schaefer@canonical.com>
Fri, 02 May 2014 12:33:19 -0700
changeset 8749 f34996d809b7
parent 8300 8393682d9d96
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fix software rendering in the mir backend. The window assumed hardware buffer, which caused testdrawchessboard to fail to mmap a buffer.
     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     mir_data->software = SDL_TRUE;
    60 
    61     if (MIR_CreateWindow(_this, window) < 0)
    62         return SDL_SetError("Failed to created a mir window.");
    63 
    64     mir_window = window->driverdata;
    65 
    66     MIR_mir_surface_get_parameters(mir_window->surface, &surfaceparm);
    67 
    68     *format = MIR_GetSDLPixelFormat(surfaceparm.pixel_format);
    69     if (*format == SDL_PIXELFORMAT_UNKNOWN)
    70         return SDL_SetError("Unknown pixel format");
    71 
    72     *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
    73 
    74     *pixels = SDL_malloc(window->h*(*pitch));
    75     if (*pixels == NULL)
    76         return SDL_OutOfMemory();
    77 
    78     mir_window->surface = MIR_mir_connection_create_surface_sync(mir_data->connection, &surfaceparm);
    79     if (!MIR_mir_surface_is_valid(mir_window->surface)) {
    80         const char* error = MIR_mir_surface_get_error_message(mir_window->surface);
    81         return SDL_SetError("Failed to created a mir surface: %s", error);
    82     }
    83 
    84     return 0;
    85 }
    86 
    87 int
    88 MIR_UpdateWindowFramebuffer(_THIS, SDL_Window* window,
    89                             const SDL_Rect* rects, int numrects)
    90 {
    91     MIR_Window* mir_window = window->driverdata;
    92 
    93     MirGraphicsRegion region;
    94     int i, j, x, y, w, h, start;
    95     int bytes_per_pixel, bytes_per_row, s_stride, d_stride;
    96     char* s_dest;
    97     char* pixels;
    98 
    99     MIR_mir_surface_get_graphics_region(mir_window->surface, &region);
   100 
   101     s_dest = region.vaddr;
   102     pixels = (char*)window->surface->pixels;
   103 
   104     s_stride = window->surface->pitch;
   105     d_stride = region.stride;
   106     bytes_per_pixel = window->surface->format->BytesPerPixel;
   107 
   108     for (i = 0; i < numrects; i++) {
   109         s_dest = region.vaddr;
   110         pixels = (char*)window->surface->pixels;
   111 
   112         x = rects[i].x;
   113         y = rects[i].y;
   114         w = rects[i].w;
   115         h = rects[i].h;
   116 
   117         if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0)
   118             continue;
   119 
   120         if (x < 0) {
   121             x += w;
   122             w += rects[i].x;
   123         }
   124 
   125         if (y < 0) {
   126             y += h;
   127             h += rects[i].y;
   128         }
   129 
   130         if (x + w > window->w)
   131             w = window->w - x;
   132         if (y + h > window->h)
   133             h = window->h - y;
   134 
   135         start = y * s_stride + x;
   136         pixels += start;
   137         s_dest += start;
   138 
   139         bytes_per_row =  bytes_per_pixel * w;
   140         for (j = 0; j < h; j++) {
   141             memcpy(s_dest, pixels, bytes_per_row);
   142             pixels += s_stride;
   143             s_dest += d_stride;
   144         }
   145     }
   146 
   147     MIR_mir_surface_swap_buffers_sync(mir_window->surface);
   148 
   149     return 0;
   150 }
   151 
   152 void
   153 MIR_DestroyWindowFramebuffer(_THIS, SDL_Window* window)
   154 {
   155 }
   156 
   157 #endif /* SDL_VIDEO_DRIVER_MIR */
   158 
   159 /* vi: set ts=4 sw=4 expandtab: */