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Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.

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Eli Gottlieb 2010-07-28 23:35:24 -04:00
parent 3433f10279
commit 9a3f51f3c5
3 changed files with 130 additions and 296 deletions
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108
src/video/SDL_shape.c
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@ -27,6 +27,7 @@
#include "SDL_pixels.h"
#include "SDL_surface.h"
#include "SDL_shape.h"
#include "SDL_shape_internals.h"
SDL_Window* SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
SDL_Window *result = SDL_CreateWindow(title,x,y,w,h,SDL_WINDOW_BORDERLESS | flags & !SDL_WINDOW_FULLSCREEN & !SDL_WINDOW_SHOWN);
@ -55,7 +56,7 @@ SDL_bool SDL_IsShapedWindow(const SDL_Window *window) {
return (SDL_bool)(window->shaper != NULL);
}
/* REQUIRES that bitmap point to a w-by-h bitmap with 1bpp. */
/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb,Uint8 value) {
int x = 0;
int y = 0;
@ -105,6 +106,111 @@ void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8*
SDL_UnlockSurface(shape);
}
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;
SDL_ShapeTree* result = malloc(sizeof(SDL_ShapeTree));
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;
case(4):
pixel_value = *(Uint32*)pixel;
break;
}
SDL_GetRGBA(pixel_value,mask->format,&r,&g,&b,&a);
switch(mode.mode) {
case(ShapeModeDefault):
pixel_transparent = (a >= 1 ? !invert : invert);
break;
case(ShapeModeBinarizeAlpha):
pixel_transparent = (a >= mode.parameters.binarizationCutoff ? !invert : invert);
break;
case(ShapeModeReverseBinarizeAlpha):
pixel_transparent = (a <= mode.parameters.binarizationCutoff ? !invert : invert);
break;
case(ShapeModeColorKey):
key = mode.parameters.colorKey;
pixel_transparent = ((key.r == r && key.g == g && key.b == b) ? !invert : invert);
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;
result->data.children.upleft = RecursivelyCalculateShapeTree(mode,mask,invert,next);
next.x = dimensions.w / 2 + 1;
//Unneeded: next.y = dimensions.y;
result->data.children.upright = RecursivelyCalculateShapeTree(mode,mask,invert,next);
next.x = dimensions.x;
next.y = dimensions.h / 2 + 1;
result->data.children.downleft = RecursivelyCalculateShapeTree(mode,mask,invert,next);
next.x = dimensions.w / 2 + 1;
//Unneeded: next.y = dimensions.h / 2 + 1;
result->data.children.downright = RecursivelyCalculateShapeTree(mode,mask,invert,next);
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;
}
void SDL_TraverseShapeTree(SDL_ShapeTree *tree,void(*function)(SDL_ShapeTree*,void*),void* closure) {
if(tree->kind == QuadShape) {
SDL_TraverseShapeTree(tree->data.children.upleft,function,closure);
SDL_TraverseShapeTree(tree->data.children.upright,function,closure);
SDL_TraverseShapeTree(tree->data.children.downleft,function,closure);
SDL_TraverseShapeTree(tree->data.children.downright,function,closure);
}
else
function(tree,closure);
}
void SDL_FreeShapeTree(SDL_ShapeTree** shapeTree) {
if((*shapeTree)->kind == QuadShape) {
SDL_FreeShapeTree(&(*shapeTree)->data.children.upleft);
SDL_FreeShapeTree(&(*shapeTree)->data.children.upright);
SDL_FreeShapeTree(&(*shapeTree)->data.children.downleft);
SDL_FreeShapeTree(&(*shapeTree)->data.children.downright);
}
free(*shapeTree);
*shapeTree = NULL;
}
int SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
int result;
if(window == NULL || !SDL_IsShapedWindow(window))