SDL  2.0
SDL_mirframebuffer.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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 int
37 MIR_CreateWindowFramebuffer(_THIS, SDL_Window* window, Uint32* format,
38  void** pixels, int* pitch)
39 {
40  MIR_Data* mir_data = _this->driverdata;
41 
42  mir_data->software = SDL_TRUE;
43 
44  if (MIR_CreateWindow(_this, window) < 0)
45  return SDL_SetError("Failed to create a mir window.");
46 
47  *format = MIR_GetSDLPixelFormat(mir_data->pixel_format);
48  if (*format == SDL_PIXELFORMAT_UNKNOWN)
49  return SDL_SetError("Unknown pixel format");
50 
51  *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
52 
53  *pixels = SDL_malloc(window->h*(*pitch));
54  if (*pixels == NULL)
55  return SDL_OutOfMemory();
56 
57  return 0;
58 }
59 
60 int
61 MIR_UpdateWindowFramebuffer(_THIS, SDL_Window* window,
62  const SDL_Rect* rects, int numrects)
63 {
64  MIR_Window* mir_window = window->driverdata;
65 
66  MirGraphicsRegion region;
67  MirBufferStream* bs;
68  int i, j, x, y, w, h, start;
69  int bytes_per_pixel, bytes_per_row, s_stride, d_stride;
70  char* s_dest;
71  char* pixels;
72 
73  bs = MIR_mir_window_get_buffer_stream(mir_window->window);
74  MIR_mir_buffer_stream_get_graphics_region(bs, &region);
75 
76  s_dest = region.vaddr;
77  pixels = (char*)window->surface->pixels;
78 
79  s_stride = window->surface->pitch;
80  d_stride = region.stride;
81  bytes_per_pixel = window->surface->format->BytesPerPixel;
82 
83  for (i = 0; i < numrects; i++) {
84  s_dest = region.vaddr;
85  pixels = (char*)window->surface->pixels;
86 
87  x = rects[i].x;
88  y = rects[i].y;
89  w = rects[i].w;
90  h = rects[i].h;
91 
92  if (w <= 0 || h <= 0 || (x + w) <= 0 || (y + h) <= 0)
93  continue;
94 
95  if (x < 0) {
96  x += w;
97  w += rects[i].x;
98  }
99 
100  if (y < 0) {
101  y += h;
102  h += rects[i].y;
103  }
104 
105  if (x + w > window->w)
106  w = window->w - x;
107  if (y + h > window->h)
108  h = window->h - y;
109 
110  start = y * s_stride + x;
111  pixels += start;
112  s_dest += start;
113 
114  bytes_per_row = bytes_per_pixel * w;
115  for (j = 0; j < h; j++) {
116  SDL_memcpy(s_dest, pixels, bytes_per_row);
117  pixels += s_stride;
118  s_dest += d_stride;
119  }
120  }
121 
122  MIR_mir_buffer_stream_swap_buffers_sync(bs);
123 
124  return 0;
125 }
126 
127 void
128 MIR_DestroyWindowFramebuffer(_THIS, SDL_Window* window)
129 {
130 }
131 
132 #endif /* SDL_VIDEO_DRIVER_MIR */
133 
134 /* vi: set ts=4 sw=4 expandtab: */