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Small speedup for bilinear resize (used for thumbnails)

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This commit is contained in:
heckflosse 2016-06-02 15:25:08 +02:00
parent c63cd8dd76
commit f885b17439
1 changed files with 12 additions and 24 deletions
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36
rtengine/iimage.h
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@ -818,33 +818,21 @@ public:
}
}
} else if (interp == TI_Bilinear) {
for (int i = 0; i < nh; i++) {
int sy = i * height / nh;
float heightByNh = float(height) / float(nh);
float widthByNw = float(width) / float(nw);
float syf = 0.f;
if (sy >= height) {
sy = height - 1;
}
for (int i = 0; i < nh; i++, syf += heightByNh) {
int sy = syf;
float dy = syf - float(sy);
int ny = sy < height - 1 ? sy + 1 : sy;
float dy = float(i) * float(height) / float(nh) - float(sy);
int ny = sy + 1;
float sxf = 0.f;
if (ny >= height) {
ny = sy;
}
for (int j = 0; j < nw; j++) {
int sx = j * width / nw;
if (sx >= width) {
sx = width;
}
float dx = float(j) * float(width) / float(nw) - float(sx);
int nx = sx + 1;
if (nx >= width) {
nx = sx;
}
for (int j = 0; j < nw; j++, sxf += widthByNw) {
int sx = sxf;
float dx = sxf - float(sx);
int nx = sx < width - 1 ? sx + 1 : sx;
convertTo(r(sy, sx) * (1.f - dx) * (1.f - dy) + r(sy, nx)*dx * (1.f - dy) + r(ny, sx) * (1.f - dx)*dy + r(ny, nx)*dx * dy, imgPtr->r(i, j));
convertTo(g(sy, sx) * (1.f - dx) * (1.f - dy) + g(sy, nx)*dx * (1.f - dy) + g(ny, sx) * (1.f - dx)*dy + g(ny, nx)*dx * dy, imgPtr->g(i, j));