src/video/x11/SDL_x11shape.c
author Sam Lantinga
Sun, 02 Feb 2014 00:53:27 -0800
changeset 8149 681eb46b8ac4
parent 8093 b43765095a6f
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fixed bug 2374 - Update copyright for 2014...

Is it that time already??
     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 #include "../../SDL_internal.h"
    22 
    23 #if SDL_VIDEO_DRIVER_X11
    24 
    25 #include "SDL_assert.h"
    26 #include "SDL_x11video.h"
    27 #include "SDL_x11shape.h"
    28 #include "SDL_x11window.h"
    29 #include "../SDL_shape_internals.h"
    30 
    31 SDL_Window*
    32 X11_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
    33     return SDL_CreateWindow(title,x,y,w,h,flags);
    34 }
    35 
    36 SDL_WindowShaper*
    37 X11_CreateShaper(SDL_Window* window) {
    38     SDL_WindowShaper* result = NULL;
    39     SDL_ShapeData* data = NULL;
    40     int resized_properly;
    41 
    42 #if SDL_VIDEO_DRIVER_X11_XSHAPE
    43     if (SDL_X11_HAVE_XSHAPE) {  /* Make sure X server supports it. */
    44         result = malloc(sizeof(SDL_WindowShaper));
    45         result->window = window;
    46         result->mode.mode = ShapeModeDefault;
    47         result->mode.parameters.binarizationCutoff = 1;
    48         result->userx = result->usery = 0;
    49         data = SDL_malloc(sizeof(SDL_ShapeData));
    50         result->driverdata = data;
    51         data->bitmapsize = 0;
    52         data->bitmap = NULL;
    53         window->shaper = result;
    54         resized_properly = X11_ResizeWindowShape(window);
    55         SDL_assert(resized_properly == 0);
    56     }
    57 #endif
    58 
    59     return result;
    60 }
    61 
    62 int
    63 X11_ResizeWindowShape(SDL_Window* window) {
    64     SDL_ShapeData* data = window->shaper->driverdata;
    65     unsigned int bitmapsize = window->w / 8;
    66     SDL_assert(data != NULL);
    67 
    68     if(window->w % 8 > 0)
    69         bitmapsize += 1;
    70     bitmapsize *= window->h;
    71     if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
    72         data->bitmapsize = bitmapsize;
    73         if(data->bitmap != NULL)
    74             free(data->bitmap);
    75         data->bitmap = malloc(data->bitmapsize);
    76         if(data->bitmap == NULL) {
    77             return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
    78         }
    79     }
    80     memset(data->bitmap,0,data->bitmapsize);
    81 
    82     window->shaper->userx = window->x;
    83     window->shaper->usery = window->y;
    84     SDL_SetWindowPosition(window,-1000,-1000);
    85 
    86     return 0;
    87 }
    88 
    89 int
    90 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
    91     SDL_ShapeData *data = NULL;
    92     SDL_WindowData *windowdata = NULL;
    93     Pixmap shapemask;
    94     
    95     if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
    96         return -1;
    97 
    98 #if SDL_VIDEO_DRIVER_X11_XSHAPE
    99     if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
   100         return -2;
   101     if(shape->w != shaper->window->w || shape->h != shaper->window->h)
   102         return -3;
   103     data = shaper->driverdata;
   104 
   105     /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
   106     SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
   107 
   108     windowdata = (SDL_WindowData*)(shaper->window->driverdata);
   109     shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
   110 
   111     X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
   112     X11_XSync(windowdata->videodata->display,False);
   113 
   114     X11_XFreePixmap(windowdata->videodata->display,shapemask);
   115 #endif
   116 
   117     return 0;
   118 }
   119 
   120 #endif /* SDL_VIDEO_DRIVER_X11 */
   121