/*

Simple DirectMedia Layer

Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../../SDL_internal.h"

#if SDL_VIDEO_DRIVER_X11

#include "SDL_assert.h"

#include "SDL_x11video.h"

#include "SDL_x11shape.h"

#include "SDL_x11window.h"

#include "../SDL_shape_internals.h"

SDL_WindowShaper*

X11_CreateShaper(SDL_Window* window) {

SDL_WindowShaper* result = NULL;

SDL_ShapeData* data = NULL;

int resized_properly;

#if SDL_VIDEO_DRIVER_X11_XSHAPE

if (SDL_X11_HAVE_XSHAPE) { /* Make sure X server supports it. */

result = malloc(sizeof(SDL_WindowShaper));

result->window = window;

result->mode.mode = ShapeModeDefault;

result->mode.parameters.binarizationCutoff = 1;

result->userx = result->usery = 0;

data = SDL_malloc(sizeof(SDL_ShapeData));

result->driverdata = data;

data->bitmapsize = 0;

data->bitmap = NULL;

window->shaper = result;

resized_properly = X11_ResizeWindowShape(window);

SDL_assert(resized_properly == 0);

}

#endif

return result;

}

int

X11_ResizeWindowShape(SDL_Window* window) {

SDL_ShapeData* data = window->shaper->driverdata;

unsigned int bitmapsize = window->w / 8;

SDL_assert(data != NULL);

if(window->w % 8 > 0)

bitmapsize += 1;

bitmapsize *= window->h;

if(data->bitmapsize != bitmapsize || data->bitmap == NULL) {

data->bitmapsize = bitmapsize;

if(data->bitmap != NULL)

free(data->bitmap);

data->bitmap = malloc(data->bitmapsize);

if(data->bitmap == NULL) {

return SDL_SetError("Could not allocate memory for shaped-window bitmap.");

}

}

memset(data->bitmap,0,data->bitmapsize);

window->shaper->userx = window->x;

window->shaper->usery = window->y;

SDL_SetWindowPosition(window,-1000,-1000);

return 0;

}

int

X11_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {

SDL_ShapeData *data = NULL;

SDL_WindowData *windowdata = NULL;

Pixmap shapemask;

if(shaper == NULL || shape == NULL || shaper->driverdata == NULL)

return -1;

#if SDL_VIDEO_DRIVER_X11_XSHAPE

if(shape->format->Amask == 0 && SDL_SHAPEMODEALPHA(shape_mode->mode))

return -2;

if(shape->w != shaper->window->w || shape->h != shaper->window->h)

return -3;

data = shaper->driverdata;

/* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */

SDL_CalculateShapeBitmap(shaper->mode,shape,data->bitmap,8);

windowdata = (SDL_WindowData*)(shaper->window->driverdata);

shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display,windowdata->xwindow,data->bitmap,shaper->window->w,shaper->window->h);

X11_XShapeCombineMask(windowdata->videodata->display,windowdata->xwindow, ShapeBounding, 0, 0,shapemask, ShapeSet);

X11_XSync(windowdata->videodata->display,False);

X11_XFreePixmap(windowdata->videodata->display,shapemask);

#endif

return 0;

}

#endif /* SDL_VIDEO_DRIVER_X11 */