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ScanLine rasterizer

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git-svn-id: svn://ultimatepp.org/upp/trunk@824 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2009-01-29 11:06:17 +00:00
parent 989a81ecfc
commit 00580386fa
5 changed files with 46 additions and 34 deletions
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29
uppdev/ScanLine/Rasterizer.cpp
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@ -14,7 +14,7 @@ Rasterizer::Rasterizer(Size _sz)
inline void Rasterizer::AddCurrent()
{
if((current.area | current.cover) && current_y >= 0 && current_y < sz.cy) {
if((current.area | current.cover)) {
cell[current_y].Add(current);
// DLOG(current.x << ", y=" << current_y);
}
@ -22,8 +22,8 @@ inline void Rasterizer::AddCurrent()
inline void Rasterizer::SetCurrent(int x, int y)
{
DLOG("cury=" << y);
if(current.x != x || current_y != y) {
// DLOG("cury=" << y);
if((current.x - x) | (current_y - y)) {
AddCurrent();
current.x = x;
current_y = y;
@ -44,7 +44,7 @@ inline void Rasterizer::RenderHLine(int ey, int x1, int y1, int x2, int y2)
if(ex1 == ex2) {
int delta = y2 - y1;
current.cover += delta;
current.area += (fx1 + fx2) * delta;
current.area += (fx1 + fx2) * delta;
return;
}
int p = (256 - fx1) * (y2 - y1);
@ -69,7 +69,7 @@ inline void Rasterizer::RenderHLine(int ey, int x1, int y1, int x2, int y2)
SetCurrent(ex1, ey);
y1 += delta;
if(ex1 != ex2) {
p = (y2 - y1 + delta) << 8;
p = (y2 - y1 + delta) * 256;
int lift = p / dx;
int rem = p % dx;
if (rem < 0) {
@ -85,7 +85,7 @@ inline void Rasterizer::RenderHLine(int ey, int x1, int y1, int x2, int y2)
delta++;
}
current.cover += delta;
current.area += delta << 8;
current.area += delta * 256;
y1 += delta;
ex1 += incr;
SetCurrent(ex1, ey);
@ -114,6 +114,8 @@ void Rasterizer::LineRaw(int x1, int y1, int x2, int y2)
int ey2 = y2 >> 8;
int fy1 = y1 & 255;
int fy2 = y2 & 255;
ASSERT(ey1 >= 0 && ey1 < sz.cy && ey2 >= 0 && ey2 < sz.cy);
DLOG(ex1 << ", " << ey1 << " - " << ex2 << ", " << ey2);
@ -169,7 +171,7 @@ void Rasterizer::LineRaw(int x1, int y1, int x2, int y2)
dy = -dy;
}
delta = p / dy;
mod = p % dy;
mod = p % dy;
if(mod < 0) {
delta--;
mod += dy;
@ -235,7 +237,7 @@ ScanLine Rasterizer::Get(int y)
int cover = 0;
DDUMP(y);
while(c < e) {
DDUMP(c->x);
// DDUMP(c->x);
int x = c->x;
int area = c->area;
cover += c->cover;
@ -245,12 +247,13 @@ ScanLine Rasterizer::Get(int y)
cover += c->cover;
c++;
}
if(area)
if(area) {
r.data.Cat(Alpha((cover << (8 + 1)) - area));
else
r.data.Cat(0);
r.len++;
x++;
r.len++;
x++;
}
// else
// r.data.Cat(0);
if(c < e && c->x > x) {
byte val = Alpha(cover << (8 + 1));
int n = c->x - x;