src/video/directfb/SDL_DirectFB_shape.c

   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 */