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SDL_DirectFB_shape.c (4154B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 #include "../../SDL_internal.h"
     22 
     23 #if SDL_VIDEO_DRIVER_DIRECTFB
     24 
     25 #include "SDL_DirectFB_video.h"
     26 #include "SDL_DirectFB_shape.h"
     27 #include "SDL_DirectFB_window.h"
     28 
     29 #include "../SDL_shape_internals.h"
     30 
     31 SDL_WindowShaper*
     32 DirectFB_CreateShaper(SDL_Window* window) {
     33     SDL_WindowShaper* result = NULL;
     34     SDL_ShapeData* data;
     35     int resized_properly;
     36 
     37     result = malloc(sizeof(SDL_WindowShaper));
     38     result->window = window;
     39     result->mode.mode = ShapeModeDefault;
     40     result->mode.parameters.binarizationCutoff = 1;
     41     result->userx = result->usery = 0;
     42     data = SDL_malloc(sizeof(SDL_ShapeData));
     43     result->driverdata = data;
     44     data->surface = NULL;
     45     window->shaper = result;
     46     resized_properly = DirectFB_ResizeWindowShape(window);
     47     SDL_assert(resized_properly == 0);
     48 
     49     return result;
     50 }
     51 
     52 int
     53 DirectFB_ResizeWindowShape(SDL_Window* window) {
     54     SDL_ShapeData* data = window->shaper->driverdata;
     55     SDL_assert(data != NULL);
     56 
     57     if (window->x != -1000)
     58     {
     59         window->shaper->userx = window->x;
     60         window->shaper->usery = window->y;
     61     }
     62     SDL_SetWindowPosition(window,-1000,-1000);
     63 
     64     return 0;
     65 }
     66 
     67 int
     68 DirectFB_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
     69 
     70     if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
     71         return -1;
     72     if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
     73         return -2;
     74     if(shape->w != shaper->window->w || shape->h != shaper->window->h)
     75         return -3;
     76 
     77     {
     78         SDL_VideoDisplay *display = SDL_GetDisplayForWindow(shaper->window);
     79         SDL_DFB_DEVICEDATA(display->device);
     80         Uint32 *pixels;
     81         Sint32 pitch;
     82         Uint32 h,w;
     83         Uint8  *src, *bitmap;
     84         DFBSurfaceDescription dsc;
     85 
     86         SDL_ShapeData *data = shaper->driverdata;
     87 
     88         SDL_DFB_RELEASE(data->surface);
     89 
     90         dsc.flags = DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;
     91         dsc.width = shape->w;
     92         dsc.height = shape->h;
     93         dsc.caps = DSCAPS_PREMULTIPLIED;
     94         dsc.pixelformat = DSPF_ARGB;
     95 
     96         SDL_DFB_CHECKERR(devdata->dfb->CreateSurface(devdata->dfb, &dsc, &data->surface));
     97 
     98         /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
     99         SDL_DFB_ALLOC_CLEAR(bitmap, shape->w * shape->h);
    100         SDL_CalculateShapeBitmap(shaper->mode,shape,bitmap,1);
    101 
    102         src = bitmap;
    103 
    104         SDL_DFB_CHECK(data->surface->Lock(data->surface, DSLF_WRITE | DSLF_READ, (void **) &pixels, &pitch));
    105 
    106         h = shaper->window->h;
    107         while (h--) {
    108             for (w = 0; w < shaper->window->w; w++) {
    109                 if (*src)
    110                     pixels[w] = 0xFFFFFFFF;
    111                 else
    112                     pixels[w] = 0;
    113                 src++;
    114 
    115             }
    116             pixels += (pitch >> 2);
    117         }
    118         SDL_DFB_CHECK(data->surface->Unlock(data->surface));
    119         SDL_DFB_FREE(bitmap);
    120 
    121         /* FIXME: Need to call this here - Big ?? */
    122         DirectFB_WM_RedrawLayout(SDL_GetDisplayForWindow(shaper->window)->device, shaper->window);
    123     }
    124 
    125     return 0;
    126 error:
    127     return -1;
    128 }
    129 
    130 #endif /* SDL_VIDEO_DRIVER_DIRECTFB */