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Recalculate residual float value for affine after shrink #26

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Switch to static casts for double values

Add unit tests that previously would have failed
This commit is contained in:
Lovell Fuller
2014-05-18 11:37:55 +01:00
parent 6622045172
commit 308d1971d8
2 changed files with 41 additions and 7 deletions
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22
src/sharp.cc
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@@ -135,17 +135,17 @@ class ResizeWorker : public NanAsyncWorker {
double factor;
if (baton->width > 0 && baton->height > 0) {
// Fixed width and height
double xfactor = (double)(in->Xsize) / (double)(baton->width);
double yfactor = (double)(in->Ysize) / (double)(baton->height);
double xfactor = static_cast<double>(in->Xsize) / static_cast<double>(baton->width);
double yfactor = static_cast<double>(in->Ysize) / static_cast<double>(baton->height);
factor = baton->crop ? std::min(xfactor, yfactor) : std::max(xfactor, yfactor);
} else if (baton->width > 0) {
// Fixed width, auto height
factor = (double)(in->Xsize) / (double)(baton->width);
baton->height = floor((double)(in->Ysize) / factor);
factor = static_cast<double>(in->Xsize) / static_cast<double>(baton->width);
baton->height = floor(static_cast<double>(in->Ysize) / factor);
} else if (baton->height > 0) {
// Fixed height, auto width
factor = (double)(in->Ysize) / (double)(baton->height);
baton->width = floor((double)(in->Xsize) / factor);
factor = static_cast<double>(in->Ysize) / static_cast<double>(baton->height);
baton->width = floor(static_cast<double>(in->Xsize) / factor);
} else {
// Identity transform
factor = 1;
@@ -156,7 +156,7 @@ class ResizeWorker : public NanAsyncWorker {
if (shrink < 1) {
shrink = 1;
}
double residual = shrink / (double)factor;
double residual = static_cast<double>(shrink) / factor;
// Try to use libjpeg shrink-on-load
int shrink_on_load = 1;
@@ -199,6 +199,14 @@ class ResizeWorker : public NanAsyncWorker {
if (vips_shrink(shrunk_on_load, &shrunk, shrink, shrink, NULL)) {
return resize_error(baton, shrunk_on_load);
}
// Recalculate residual float based on dimensions of required vs shrunk images
double residualx = static_cast<double>(baton->width) / static_cast<double>(shrunk->Xsize);
double residualy = static_cast<double>(baton->height) / static_cast<double>(shrunk->Ysize);
if (baton->crop) {
residual = std::max(residualx, residualy);
} else {
residual = std::min(residualx, residualy);
}
} else {
vips_copy(shrunk_on_load, &shrunk, NULL);
}