SDL  2.0
SDL_DirectFB_shape.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 #include "../../SDL_internal.h"
22 
23 #if SDL_VIDEO_DRIVER_DIRECTFB
24 
25 #include "SDL_assert.h"
26 #include "SDL_DirectFB_video.h"
27 #include "SDL_DirectFB_shape.h"
28 #include "SDL_DirectFB_window.h"
29 
30 #include "../SDL_shape_internals.h"
31 
32 SDL_WindowShaper*
33 DirectFB_CreateShaper(SDL_Window* window) {
34  SDL_WindowShaper* result = NULL;
35  SDL_ShapeData* data;
36  int resized_properly;
37 
38  result = malloc(sizeof(SDL_WindowShaper));
39  result->window = window;
40  result->mode.mode = ShapeModeDefault;
41  result->mode.parameters.binarizationCutoff = 1;
42  result->userx = result->usery = 0;
43  data = SDL_malloc(sizeof(SDL_ShapeData));
44  result->driverdata = data;
45  data->surface = NULL;
46  window->shaper = result;
47  resized_properly = DirectFB_ResizeWindowShape(window);
48  SDL_assert(resized_properly == 0);
49 
50  return result;
51 }
52 
53 int
54 DirectFB_ResizeWindowShape(SDL_Window* window) {
55  SDL_ShapeData* data = window->shaper->driverdata;
56  SDL_assert(data != NULL);
57 
58  if (window->x != -1000)
59  {
60  window->shaper->userx = window->x;
61  window->shaper->usery = window->y;
62  }
63  SDL_SetWindowPosition(window,-1000,-1000);
64 
65  return 0;
66 }
67 
68 int
69 DirectFB_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
70 
71  if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
72  return -1;
73  if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
74  return -2;
75  if(shape->w != shaper->window->w || shape->h != shaper->window->h)
76  return -3;
77 
78  {
79  SDL_VideoDisplay *display = SDL_GetDisplayForWindow(shaper->window);
80  SDL_DFB_DEVICEDATA(display->device);
81  Uint32 *pixels;
82  Sint32 pitch;
83  Uint32 h,w;
84  Uint8 *src, *bitmap;
85  DFBSurfaceDescription dsc;
86 
87  SDL_ShapeData *data = shaper->driverdata;
88 
89  SDL_DFB_RELEASE(data->surface);
90 
91  dsc.flags = DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;
92  dsc.width = shape->w;
93  dsc.height = shape->h;
94  dsc.caps = DSCAPS_PREMULTIPLIED;
95  dsc.pixelformat = DSPF_ARGB;
96 
97  SDL_DFB_CHECKERR(devdata->dfb->CreateSurface(devdata->dfb, &dsc, &data->surface));
98 
99  /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
100  SDL_DFB_ALLOC_CLEAR(bitmap, shape->w * shape->h);
101  SDL_CalculateShapeBitmap(shaper->mode,shape,bitmap,1);
102 
103  src = bitmap;
104 
105  SDL_DFB_CHECK(data->surface->Lock(data->surface, DSLF_WRITE | DSLF_READ, (void **) &pixels, &pitch));
106 
107  h = shaper->window->h;
108  while (h--) {
109  for (w = 0; w < shaper->window->w; w++) {
110  if (*src)
111  pixels[w] = 0xFFFFFFFF;
112  else
113  pixels[w] = 0;
114  src++;
115 
116  }
117  pixels += (pitch >> 2);
118  }
119  SDL_DFB_CHECK(data->surface->Unlock(data->surface));
120  SDL_DFB_FREE(bitmap);
121 
122  /* FIXME: Need to call this here - Big ?? */
123  DirectFB_WM_RedrawLayout(SDL_GetDisplayForWindow(shaper->window)->device, shaper->window);
124  }
125 
126  return 0;
127 error:
128  return -1;
129 }
130 
131 #endif /* SDL_VIDEO_DRIVER_DIRECTFB */