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PYRAMID PARTY!!!

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This commit is contained in:
Derek Foreman 2003-04-15 02:21:00 +00:00
parent db251b0828
commit 8f5e1a0fcb
2 changed files with 43 additions and 0 deletions
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42
render/gradient.c
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@ -26,6 +26,9 @@ void gradient_render(Surface *sf, int w, int h)
case Background_CrossDiagonal:
gradient_crossdiagonal(sf, w, h);
break;
case Background_Pyramid:
gradient_pyramid(sf, w, h);
break;
default:
g_message("unhandled gradient");
return;
@ -327,3 +330,42 @@ void gradient_solid(Appearance *l, int x, int y, int w, int h)
}
*/
}
void gradient_pyramid(Surface *sf, int inw, int inh)
{
pixel32 *data = sf->data.planar.pixel_data;
pixel32 *end = data + inw*inh;
pixel32 current;
float drx, dgx, dbx, dry, dgy, dby;
unsigned int r,g,b;
int x, y, h=inh/2, w=inw/2;
memset(data, 0, inw*inh*sizeof(pixel32));
for (y = 0; y < h; ++y) {
drx = (float)(sf->data.planar.secondary->r - sf->data.planar.primary->r);
dry = drx/(float)h;
drx/= (float)w;
dgx = (float)(sf->data.planar.secondary->g - sf->data.planar.primary->g);
dgy = dgx/(float)h;
dgx/= (float)w;
dbx = (float)(sf->data.planar.secondary->b - sf->data.planar.primary->b);
dby = dbx/(float)h;
dbx/= (float)w;
for (x = 0; x < w; ++x, data) {
r = sf->data.planar.primary->r + ((int)(drx * x) + (int)(dry * y))/2;
g = sf->data.planar.primary->g + ((int)(dgx * x) + (int)(dgy * y))/2;
b = sf->data.planar.primary->b + ((int)(dbx * x) + (int)(dby * y))/2;
current = (r << default_red_shift)
+ (g << default_green_shift)
+ (b << default_blue_shift);
*(data+x) = current;
*(data+inw-x) = current;
*(end-x) = current;
*(end-(inw-x)) = current;
}
data+=inw;
end-=inw;
}
}

1
render/gradient.h
View file

@ -8,6 +8,7 @@ void gradient_vertical(Surface *sf, int w, int h);
void gradient_horizontal(Surface *sf, int w, int h);
void gradient_diagonal(Surface *sf, int w, int h);
void gradient_crossdiagonal(Surface *sf, int w, int h);
void gradient_pyramid(Surface *sf, int w, int h);
void gradient_solid(Appearance *l, int x, int y, int w, int h);
void highlight(pixel32 *x, pixel32 *y, gboolean raised);