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SDL_x11shape.c (3942B)

      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_X11
     24 
     25 #include "SDL_x11video.h"
     26 #include "SDL_x11shape.h"
     27 #include "SDL_x11window.h"
     28 #include "../SDL_shape_internals.h"
     29 
     30 SDL_WindowShaper*
     31 X11_CreateShaper(SDL_Window* window) {
     32     SDL_WindowShaper* result = NULL;
     33     SDL_ShapeData* data = NULL;
     34     int resized_properly;
     35 
     36 #if SDL_VIDEO_DRIVER_X11_XSHAPE
     37     if (SDL_X11_HAVE_XSHAPE) {  /* Make sure X server supports it. */
     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->bitmapsize = 0;
     46         data->bitmap = NULL;
     47         window->shaper = result;
     48         resized_properly = X11_ResizeWindowShape(window);
     49         SDL_assert(resized_properly == 0);
     50     }
     51 #endif
     52 
     53     return result;
     54 }
     55 
     56 int
     57 X11_ResizeWindowShape(SDL_Window* window) {
     58     SDL_ShapeData* data = window->shaper->driverdata;
     59     unsigned int bitmapsize = window->w / 8;
     60     SDL_assert(data != NULL);
     61 
     62     if(window->w % 8 > 0)
     63         bitmapsize += 1;
     64     bitmapsize *= window->h;
     65     if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
     66         data->bitmapsize = bitmapsize;
     67         if(data->bitmap != NULL)
     68             free(data->bitmap);
     69         data->bitmap = malloc(data->bitmapsize);
     70         if(data->bitmap == NULL) {
     71             return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
     72         }
     73     }
     74     memset(data->bitmap,0,data->bitmapsize);
     75 
     76     window->shaper->userx = window->x;
     77     window->shaper->usery = window->y;
     78     SDL_SetWindowPosition(window,-1000,-1000);
     79 
     80     return 0;
     81 }
     82 
     83 int
     84 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
     85     SDL_ShapeData *data = NULL;
     86     SDL_WindowData *windowdata = NULL;
     87     Pixmap shapemask;
     88     
     89     if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
     90         return -1;
     91 
     92 #if SDL_VIDEO_DRIVER_X11_XSHAPE
     93     if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
     94         return -2;
     95     if(shape->w != shaper->window->w || shape->h != shaper->window->h)
     96         return -3;
     97     data = shaper->driverdata;
     98 
     99     /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
    100     SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
    101 
    102     windowdata = (SDL_WindowData*)(shaper->window->driverdata);
    103     shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
    104 
    105     X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
    106     X11_XSync(windowdata->videodata->display,False);
    107 
    108     X11_XFreePixmap(windowdata->videodata->display,shapemask);
    109 #endif
    110 
    111     return 0;
    112 }
    113 
    114 #endif /* SDL_VIDEO_DRIVER_X11 */