src/video/x11/SDL_x11shape.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 08 Apr 2011 13:03:26 -0700
changeset 5535 96594ac5fd1a
parent 5481 22dfc3958dc3
child 5981 75caa8a7d559
permissions -rw-r--r--
SDL 1.3 is now under the zlib license.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_X11
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#include "SDL_assert.h"
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#include "SDL_x11video.h"
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#include "SDL_x11shape.h"
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#include "SDL_x11window.h"
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SDL_Window*
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X11_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
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    return SDL_CreateWindow(title,x,y,w,h,flags);
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}
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SDL_WindowShaper*
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X11_CreateShaper(SDL_Window* window) {
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    SDL_WindowShaper* result = NULL;
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#if SDL_VIDEO_DRIVER_X11_XSHAPE
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    if (SDL_X11_HAVE_XSHAPE) {  /* Make sure X server supports it. */
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        result = malloc(sizeof(SDL_WindowShaper));
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        result->window = window;
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        result->mode.mode = ShapeModeDefault;
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        result->mode.parameters.binarizationCutoff = 1;
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        result->userx = result->usery = 0;
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        SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
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        result->driverdata = data;
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        data->bitmapsize = 0;
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        data->bitmap = NULL;
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        window->shaper = result;
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        int resized_properly = X11_ResizeWindowShape(window);
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        SDL_assert(resized_properly == 0);
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    }
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#endif
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    return result;
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}
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int
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X11_ResizeWindowShape(SDL_Window* window) {
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    SDL_ShapeData* data = window->shaper->driverdata;
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    SDL_assert(data != NULL);
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    unsigned int bitmapsize = window->w / 8;
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    if(window->w % 8 > 0)
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        bitmapsize += 1;
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    bitmapsize *= window->h;
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    if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {
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        data->bitmapsize = bitmapsize;
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        if(data->bitmap != NULL)
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            free(data->bitmap);
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        data->bitmap = malloc(data->bitmapsize);
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        if(data->bitmap == NULL) {
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            SDL_SetError("Could not allocate memory for shaped-window bitmap.");
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            return -1;
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        }
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    }
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    memset(data->bitmap,0,data->bitmapsize);
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    window->shaper->userx = window->x;
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    window->shaper->usery = window->y;
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    SDL_SetWindowPosition(window,-1000,-1000);
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    return 0;
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}
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int
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X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
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    if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)
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        return -1;
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#if SDL_VIDEO_DRIVER_X11_XSHAPE
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    if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))
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        return -2;
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    if(shape->w != shaper->window->w || shape->h != shaper->window->h)
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        return -3;
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    SDL_ShapeData *data = shaper->driverdata;
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    /* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
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    SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);
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    SDL_WindowData *windowdata = (SDL_WindowData*)(shaper->window->driverdata);
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    Pixmap shapemask = XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);
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    XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);
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    XSync(windowdata->videodata->display,False);
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    XFreePixmap(windowdata->videodata->display,shapemask);
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#endif
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    return 0;
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}
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#endif /* SDL_VIDEO_DRIVER_X11 */
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