src/video/x11/SDL_x11shape.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 17 Jul 2019 16:47:19 -0700
changeset 12948 c055adbafa82
parent 12503 806492103856
permissions -rw-r--r--
Fixed build error
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2019 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_WindowShaper*
    32 X11_CreateShaper(SDL_Window* window) {
    33     SDL_WindowShaper* result = NULL;
    34     SDL_ShapeData* data = NULL;
    35     int resized_properly;
    36 
    37 #if SDL_VIDEO_DRIVER_X11_XSHAPE
    38     if (SDL_X11_HAVE_XSHAPE) {  /* Make sure X server supports it. */
    39         result = malloc(sizeof(SDL_WindowShaper));
    40         result->window = window;
    41         result->mode.mode = ShapeModeDefault;
    42         result->mode.parameters.binarizationCutoff = 1;
    43         result->userx = result->usery = 0;
    44         data = SDL_malloc(sizeof(SDL_ShapeData));
    45         result->driverdata = data;
    46         data->bitmapsize = 0;
    47         data->bitmap = NULL;
    48         window->shaper = result;
    49         resized_properly = X11_ResizeWindowShape(window);
    50         SDL_assert(resized_properly == 0);
    51     }
    52 #endif
    53 
    54     return result;
    55 }
    56 
    57 int
    58 X11_ResizeWindowShape(SDL_Window* window) {
    59     SDL_ShapeData* data = window->shaper->driverdata;
    60     unsigned int bitmapsize = window->w / 8;
    61     SDL_assert(data != NULL);
    62 
    63     if(window->w % 8 > 0)
    64         bitmapsize += 1;
    65     bitmapsize *= window->h;
    66     if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
    67         data->bitmapsize = bitmapsize;
    68         if(data->bitmap != NULL)
    69             free(data->bitmap);
    70         data->bitmap = malloc(data->bitmapsize);
    71         if(data->bitmap == NULL) {
    72             return SDL_SetError("Could not allocate memory for shaped-window bitmap.");
    73         }
    74     }
    75     memset(data->bitmap,0,data->bitmapsize);
    76 
    77     window->shaper->userx = window->x;
    78     window->shaper->usery = window->y;
    79     SDL_SetWindowPosition(window,-1000,-1000);
    80 
    81     return 0;
    82 }
    83 
    84 int
    85 X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
    86     SDL_ShapeData *data = NULL;
    87     SDL_WindowData *windowdata = NULL;
    88     Pixmap shapemask;
    89     
    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     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     windowdata = (SDL_WindowData*)(shaper->window->driverdata);
   104     shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
   105 
   106     X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
   107     X11_XSync(windowdata->videodata->display,False);
   108 
   109     X11_XFreePixmap(windowdata->videodata->display,shapemask);
   110 #endif
   111 
   112     return 0;
   113 }
   114 
   115 #endif /* SDL_VIDEO_DRIVER_X11 */