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SDL_shape.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 2010 Eli Gottlieb
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Eli Gottlieb
eligottlieb@gmail.com
*/
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#include "SDL_config.h"
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#include "SDL.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
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#include "SDL_pixels.h"
#include "SDL_surface.h"
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#include "SDL_shape.h"
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#include "SDL_shape_internals.h"
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SDL_Window* SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
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SDL_Window *result = SDL_CreateWindow(title,x,y,w,h,SDL_WINDOW_BORDERLESS | flags & !SDL_WINDOW_FULLSCREEN & !SDL_WINDOW_SHOWN);
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if(result != NULL) {
result->shaper = result->display->device->shape_driver.CreateShaper(result);
if(result->shaper != NULL) {
result->shaper->usershownflag = flags & SDL_WINDOW_SHOWN;
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result->shaper->mode.mode = ShapeModeDefault;
result->shaper->mode.parameters.binarizationCutoff = 1;
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result->shaper->hasshape = SDL_FALSE;
return result;
}
else {
SDL_DestroyWindow(result);
return NULL;
}
}
else
return NULL;
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}
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SDL_bool SDL_IsShapedWindow(const SDL_Window *window) {
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if(window == NULL)
return SDL_FALSE;
else
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return (SDL_bool)(window->shaper != NULL);
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}
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/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
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void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb) {
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int x = 0;
int y = 0;
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Uint8 r = 0,g = 0,b = 0,alpha = 0;
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Uint8* pixel = NULL;
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Uint32 bitmap_pixel,pixel_value = 0,mask_value = 0;
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SDL_Color key;
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if(SDL_MUSTLOCK(shape))
SDL_LockSurface(shape);
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pixel = (Uint8*)shape->pixels;
for(y = 0;y<shape->h;y++) {
for(x=0;x<shape->w;x++) {
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alpha = 0;
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pixel_value = 0;
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pixel = (Uint8 *)(shape->pixels) + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
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switch(shape->format->BytesPerPixel) {
case(1):
pixel_value = *(Uint8*)pixel;
break;
case(2):
pixel_value = *(Uint16*)pixel;
break;
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case(3):
pixel_value = *(Uint32*)pixel & (~shape->format->Amask);
break;
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case(4):
pixel_value = *(Uint32*)pixel;
break;
}
SDL_GetRGBA(pixel_value,shape->format,&r,&g,&b,&alpha);
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bitmap_pixel = y*shape->w + x;
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switch(mode.mode) {
case(ShapeModeDefault):
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mask_value = (alpha >= 1 ? 1 : 0);
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break;
case(ShapeModeBinarizeAlpha):
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mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0);
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break;
case(ShapeModeReverseBinarizeAlpha):
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mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0);
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break;
case(ShapeModeColorKey):
key = mode.parameters.colorKey;
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mask_value = ((key.r != r && key.g != g && key.b != b) ? 1 : 0);
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break;
}
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bitmap[bitmap_pixel / ppb] |= mask_value << (7 - ((ppb - 1) - (bitmap_pixel % ppb)));
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}
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}
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if(SDL_MUSTLOCK(shape))
SDL_UnlockSurface(shape);
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}
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SDL_ShapeTree* RecursivelyCalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* mask,SDL_bool invert,SDL_Rect dimensions) {
int x = 0,y = 0;
Uint8* pixel = NULL;
Uint32 pixel_value = 0;
Uint8 r = 0,g = 0,b = 0,a = 0;
SDL_bool pixel_transparent = SDL_FALSE;
int last_transparent = -1;
SDL_Color key;
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SDL_ShapeTree* result = (SDL_ShapeTree*)SDL_malloc(sizeof(SDL_ShapeTree));
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SDL_Rect next = {0,0,0,0};
for(y=dimensions.y;y<dimensions.h;y++)
for(x=dimensions.x;x<dimensions.w;x++) {
pixel_value = 0;
pixel = (Uint8 *)(mask->pixels) + (y*mask->pitch) + (x*mask->format->BytesPerPixel);
switch(mask->format->BytesPerPixel) {
case(1):
pixel_value = *(Uint8*)pixel;
break;
case(2):
pixel_value = *(Uint16*)pixel;
break;
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case(3):
pixel_value = *(Uint32*)pixel & (~mask->format->Amask);
break;
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case(4):
pixel_value = *(Uint32*)pixel;
break;
}
SDL_GetRGBA(pixel_value,mask->format,&r,&g,&b,&a);
switch(mode.mode) {
case(ShapeModeDefault):
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pixel_transparent = (SDL_bool)(a >= 1 ? !invert : invert);
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break;
case(ShapeModeBinarizeAlpha):
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pixel_transparent = (SDL_bool)(a >= mode.parameters.binarizationCutoff ? !invert : invert);
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break;
case(ShapeModeReverseBinarizeAlpha):
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pixel_transparent = (SDL_bool)(a <= mode.parameters.binarizationCutoff ? !invert : invert);
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break;
case(ShapeModeColorKey):
key = mode.parameters.colorKey;
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pixel_transparent = (SDL_bool)((key.r == r && key.g == g && key.b == b) ? !invert : invert);
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break;
}
if(last_transparent == -1) {
last_transparent = pixel_transparent;
break;
}
if(last_transparent != pixel_transparent) {
result->kind = QuadShape;
//These will stay the same.
next.w = dimensions.w / 2;
next.h = dimensions.h / 2;
//These will change from recursion to recursion.
next.x = dimensions.x;
next.y = dimensions.y;
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result->data.children.upleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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next.x = dimensions.w / 2 + 1;
//Unneeded: next.y = dimensions.y;
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result->data.children.upright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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next.x = dimensions.x;
next.y = dimensions.h / 2 + 1;
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result->data.children.downleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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next.x = dimensions.w / 2 + 1;
//Unneeded: next.y = dimensions.h / 2 + 1;
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result->data.children.downright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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return result;
}
}
//If we never recursed, all the pixels in this quadrant have the same "value".
result->kind = (last_transparent == SDL_FALSE ? OpaqueShape : TransparentShape);
result->data.shape = dimensions;
return result;
}
SDL_ShapeTree* SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shape,SDL_bool invert) {
SDL_Rect dimensions = {0,0,shape->w,shape->h};
SDL_ShapeTree* result = NULL;
if(SDL_MUSTLOCK(shape))
SDL_LockSurface(shape);
result = RecursivelyCalculateShapeTree(mode,shape,invert,dimensions);
if(SDL_MUSTLOCK(shape))
SDL_UnlockSurface(shape);
return result;
}
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void SDL_TraverseShapeTree(SDL_ShapeTree *tree,SDL_TraversalFunction function,void* closure) {
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if(tree->kind == QuadShape) {
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SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure);
SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright,function,closure);
SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downleft,function,closure);
SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downright,function,closure);
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}
else
function(tree,closure);
}
void SDL_FreeShapeTree(SDL_ShapeTree** shapeTree) {
if((*shapeTree)->kind == QuadShape) {
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SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upleft);
SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upright);
SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downleft);
SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downright);
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}
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SDL_free(*shapeTree);
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*shapeTree = NULL;
}
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int SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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int result;
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if(window == NULL || !SDL_IsShapedWindow(window))
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//The window given was not a shapeable window.
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return SDL_NONSHAPEABLE_WINDOW;
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if(shape == NULL)
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//Invalid shape argument.
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return SDL_INVALID_SHAPE_ARGUMENT;
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if(shapeMode != NULL)
window->shaper->mode = *shapeMode;
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//TODO: Platform-specific implementations of SetWindowShape. X11 is finished. Win32 is finished. Debugging is in progress on both.
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result = window->display->device->shape_driver.SetWindowShape(window->shaper,shape,shapeMode);
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window->shaper->hasshape = SDL_TRUE;
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if((window->shaper->usershownflag & SDL_WINDOW_SHOWN) == SDL_WINDOW_SHOWN) {
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SDL_ShowWindow(window);
window->shaper->usershownflag &= !SDL_WINDOW_SHOWN;
}
return result;
}
SDL_bool SDL_WindowHasAShape(SDL_Window *window) {
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if (window == NULL && !SDL_IsShapedWindow(window))
return SDL_FALSE;
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return window->shaper->hasshape;
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}
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int SDL_GetShapedWindowMode(SDL_Window *window,SDL_WindowShapeMode *shapeMode) {
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if(window != NULL && SDL_IsShapedWindow(window)) {
if(shapeMode == NULL) {
if(SDL_WindowHasAShape(window))
//The window given has a shape.
return 0;
else
//The window given is shapeable but lacks a shape.
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return SDL_WINDOW_LACKS_SHAPE;
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}
else {
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*shapeMode = window->shaper->mode;
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return 0;
}
}
else
//The window given is not a valid shapeable window.
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return SDL_NONSHAPEABLE_WINDOW;
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}