cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_mirframebuffer.c (4622B)

      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
     36static 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
     45Uint32
     46MIR_GetSDLPixelFormat(MirPixelFormat format)
     47{
     48    return mir_pixel_format_to_sdl_format[format];
     49}
     50
     51int
     52MIR_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
     87int
     88MIR_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
    152void
    153MIR_DestroyWindowFramebuffer(_THIS, SDL_Window* window)
    154{
    155}
    156
    157#endif /* SDL_VIDEO_DRIVER_MIR */
    158
    159/* vi: set ts=4 sw=4 expandtab: */