Atlas - SDL_mirframebuffer.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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, <[email protected]>
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
36int
37MIR_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
60int
61MIR_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
127void
128MIR_DestroyWindowFramebuffer(_THIS, SDL_Window* window)
129{
130}
131
132#endif /* SDL_VIDEO_DRIVER_MIR */
133
134/* vi: set ts=4 sw=4 expandtab: */
135
[FILE END]
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