src/video/x11/SDL_x11shape.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 13 Oct 2011 01:08:30 -0400
changeset 5981 75caa8a7d559
parent 5535 96594ac5fd1a
child 6138 4c64952a58fb
permissions -rw-r--r--
Fixed a whole slew of compiler warnings that -Wall exposed.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2011 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_config.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 
    40 #if SDL_VIDEO_DRIVER_X11_XSHAPE
    41     if (SDL_X11_HAVE_XSHAPE) {  /* Make sure X server supports it. */
    42         result = malloc(sizeof(SDL_WindowShaper));
    43         result->window = window;
    44         result->mode.mode = ShapeModeDefault;
    45         result->mode.parameters.binarizationCutoff = 1;
    46         result->userx = result->usery = 0;
    47         SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
    48         result->driverdata = data;
    49         data->bitmapsize = 0;
    50         data->bitmap = NULL;
    51         window->shaper = result;
    52         int resized_properly = X11_ResizeWindowShape(window);
    53         SDL_assert(resized_properly == 0);
    54     }
    55 #endif
    56 
    57     return result;
    58 }
    59 
    60 int
    61 X11_ResizeWindowShape(SDL_Window* window) {
    62     SDL_ShapeData* data = window->shaper->driverdata;
    63     SDL_assert(data != NULL);
    64     
    65     unsigned int bitmapsize = window->w / 8;
    66     if(window->w % 8 > 0)
    67         bitmapsize += 1;
    68     bitmapsize *= window->h;
    69     if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
    70         data->bitmapsize = bitmapsize;
    71         if(data->bitmap != NULL)
    72             free(data->bitmap);
    73         data->bitmap = malloc(data->bitmapsize);
    74         if(data->bitmap == NULL) {
    75             SDL_SetError("Could not allocate memory for shaped-window bitmap.");
    76             return -1;
    77         }
    78     }
    79     memset(data->bitmap,0,data->bitmapsize);
    80     
    81     window->shaper->userx = window->x;
    82     window->shaper->usery = window->y;
    83     SDL_SetWindowPosition(window,-1000,-1000);
    84     
    85     return 0;
    86 }
    87     
    88 int
    89 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
    90     if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
    91         return -1;
    92 
    93 #if SDL_VIDEO_DRIVER_X11_XSHAPE
    94     if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
    95         return -2;
    96     if(shape->w != shaper->window->w || shape->h != shaper->window->h)
    97         return -3;
    98     SDL_ShapeData *data = shaper->driverdata;
    99     
   100     /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
   101     SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
   102         
   103     SDL_WindowData *windowdata = (SDL_WindowData*)(shaper->window->driverdata);
   104     Pixmap shapemask = XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
   105     
   106     XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
   107     XSync(windowdata->videodata->display,False);
   108 
   109     XFreePixmap(windowdata->videodata->display,shapemask);
   110 #endif
   111 
   112     return 0;
   113 }
   114 
   115 #endif /* SDL_VIDEO_DRIVER_X11 */
   116