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avoid GC allocation in ColorDrawBufBase.drawRescaled, use original scale factor (before clipping)

This commit is contained in:
Dmitry Popov 2016-03-03 21:41:07 +07:00
parent f7e0fa2503
commit 5d48ae8fc4
1 changed files with 14 additions and 8 deletions
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22
src/dlangui/graphics/drawbuf.d
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@ -475,13 +475,16 @@ class ColorDrawBufBase : DrawBuf {
}
}
import std.container.array;
/// Create mapping of source coordinates to destination coordinates, for resize.
private int[] createMap(int dst0, int dst1, int src0, int src1) {
private Array!int createMap(int dst0, int dst1, int src0, int src1, double k) {
int dd = dst1 - dst0;
int sd = src1 - src0;
int[] res = new int[dd];
//int sd = src1 - src0;
Array!int res;
res.length = dd;
foreach(int i; 0 .. dd)
res[i] = src0 + i * sd / dd;
res[i] = src0 + cast(int)(i * k);//sd / dd;
return res;
}
@ -490,11 +493,14 @@ class ColorDrawBufBase : DrawBuf {
//Log.d("drawRescaled ", dstrect, " <- ", srcrect);
if (_alpha >= 254)
return; // fully transparent - don't draw
double kx = cast(double)srcrect.width / dstrect.width;
double ky = cast(double)srcrect.height / dstrect.height;
if (applyClipping(dstrect, srcrect)) {
int[] xmapArray = createMap(dstrect.left, dstrect.right, srcrect.left, srcrect.right);
int[] ymapArray = createMap(dstrect.top, dstrect.bottom, srcrect.top, srcrect.bottom);
int * xmap = xmapArray.ptr;
int * ymap = ymapArray.ptr;
auto xmapArray = createMap(dstrect.left, dstrect.right, srcrect.left, srcrect.right, kx);
auto ymapArray = createMap(dstrect.top, dstrect.bottom, srcrect.top, srcrect.bottom, ky);
int * xmap = &xmapArray[0];
int * ymap = &ymapArray[0];
int dx = dstrect.width;
int dy = dstrect.height;
ColorDrawBufBase colorDrawBuf = cast(ColorDrawBufBase) src;