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Improve image_scale2x_tpl() performance with iterators for dst image

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This commit is contained in:
David Capello 2015-06-20 02:23:41 -03:00
parent 77fefa8ec0
commit 430b0ca637
1 changed files with 15 additions and 4 deletions
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19
src/doc/algorithm/rotsprite.cpp
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@ -121,8 +121,13 @@ static void image_scale2x_tpl(Image* dst, const Image* src, int src_w, int src_h
#define D c[3]
#define P c[4]
LockImageBits<ImageTraits> dstBits(dst, gfx::Rect(0, 0, src_w*2, src_h*2));
auto dstIt = dstBits.begin();
auto dstIt2 = dstIt;
color_t c[5];
for (int y=0; y<src_h; ++y) {
dstIt2 += src_w*2;
for (int x=0; x<src_w; ++x) {
P = get_pixel_fast<ImageTraits>(src, x, y);
A = (y > 0 ? get_pixel_fast<ImageTraits>(src, x, y-1): P);
@ -130,11 +135,17 @@ static void image_scale2x_tpl(Image* dst, const Image* src, int src_w, int src_h
C = (x > 0 ? get_pixel_fast<ImageTraits>(src, x-1, y): P);
D = (y < src_h-1 ? get_pixel_fast<ImageTraits>(src, x, y+1): P);
put_pixel_fast<ImageTraits>(dst, 2*x, 2*y, (C == A && C != D && A != B ? A: P));
put_pixel_fast<ImageTraits>(dst, 2*x+1, 2*y, (A == B && A != C && B != D ? B: P));
put_pixel_fast<ImageTraits>(dst, 2*x, 2*y+1, (D == C && D != B && C != A ? C: P));
put_pixel_fast<ImageTraits>(dst, 2*x+1, 2*y+1, (B == D && B != A && D != C ? D: P));
*dstIt = (C == A && C != D && A != B ? A: P);
++dstIt;
*dstIt = (A == B && A != C && B != D ? B: P);
++dstIt;
*dstIt2 = (D == C && D != B && C != A ? C: P);
++dstIt2;
*dstIt2 = (B == D && B != A && D != C ? D: P);
++dstIt2;
}
dstIt += src_w*2;
}
#endif