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Expose density metadata; set density of images from vector input

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Lovell Fuller
2016-03-01 19:27:47 +00:00
parent d92ea31858
commit bb37dc1ea6
12 changed files with 98 additions and 9 deletions
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24
src/common.cc
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@@ -176,6 +176,30 @@ namespace sharp {
SetExifOrientation(image, 0);
}
/*
Does this image have a non-default density?
*/
bool HasDensity(VImage image) {
return image.xres() > 1.0;
}
/*
Get pixels/mm resolution as pixels/inch density.
*/
int GetDensity(VImage image) {
return static_cast<int>(round(image.xres() * 25.4));
}
/*
Set pixels/mm resolution based on a pixels/inch density.
*/
void SetDensity(VImage image, const int density) {
const double pixelsPerMm = static_cast<double>(density) / 25.4;
image.set("Xres", pixelsPerMm);
image.set("Yres", pixelsPerMm);
image.set(VIPS_META_RESOLUTION_UNIT, "in");
}
/*
Called when a Buffer undergoes GC, required to support mixed runtime libraries in Windows
*/