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Switch from libvips' C to C++ binding

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Requires upgrade to libvips 8.2.1
This commit is contained in:
Lovell Fuller
2016-01-14 18:40:59 +00:00
parent 11329d5e09
commit 5c9c17f1f6
21 changed files with 4348 additions and 1178 deletions
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93
src/utilities.cc
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@@ -1,6 +1,6 @@
#include <cmath>
#include <node.h>
#include <vips/vips.h>
#include <vips/vips8>
#include <vips/vector.h>
#include "nan.h"
@@ -196,103 +196,60 @@ NAN_METHOD(format) {
between two images of the same dimensions and number of channels.
*/
NAN_METHOD(_maxColourDistance) {
using vips::VImage;
using vips::VError;
using sharp::DetermineImageType;
using sharp::ImageType;
using sharp::InitImage;
using sharp::HasAlpha;
HandleScope();
// Create "hook" VipsObject to hang image references from
VipsObject *hook = reinterpret_cast<VipsObject*>(vips_image_new());
// Open input files
VipsImage *image1 = nullptr;
VImage image1;
ImageType imageType1 = DetermineImageType(*Utf8String(info[0]));
if (imageType1 != ImageType::UNKNOWN) {
image1 = InitImage(*Utf8String(info[0]), VIPS_ACCESS_SEQUENTIAL);
if (image1 == nullptr) {
g_object_unref(hook);
try {
image1 = VImage::new_from_file(*Utf8String(info[0]));
} catch (...) {
return ThrowError("Input file 1 has corrupt header");
} else {
vips_object_local(hook, image1);
}
} else {
g_object_unref(hook);
return ThrowError("Input file 1 is of an unsupported image format");
}
VipsImage *image2 = nullptr;
VImage image2;
ImageType imageType2 = DetermineImageType(*Utf8String(info[1]));
if (imageType2 != ImageType::UNKNOWN) {
image2 = InitImage(*Utf8String(info[1]), VIPS_ACCESS_SEQUENTIAL);
if (image2 == nullptr) {
g_object_unref(hook);
try {
image2 = VImage::new_from_file(*Utf8String(info[1]));
} catch (...) {
return ThrowError("Input file 2 has corrupt header");
} else {
vips_object_local(hook, image2);
}
} else {
g_object_unref(hook);
return ThrowError("Input file 2 is of an unsupported image format");
}
// Ensure same number of channels
if (image1->Bands != image2->Bands) {
g_object_unref(hook);
if (image1.bands() != image2.bands()) {
return ThrowError("mismatchedBands");
}
// Ensure same dimensions
if (image1->Xsize != image2->Xsize || image1->Ysize != image2->Ysize) {
g_object_unref(hook);
if (image1.width() != image2.width() || image1.height() != image2.height()) {
return ThrowError("mismatchedDimensions");
}
// Premultiply and remove alpha
if (HasAlpha(image1)) {
VipsImage *imagePremultiplied1;
if (vips_premultiply(image1, &imagePremultiplied1, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
}
vips_object_local(hook, imagePremultiplied1);
VipsImage *imagePremultipliedNoAlpha1;
if (vips_extract_band(image1, &imagePremultipliedNoAlpha1, 1, "n", image1->Bands - 1, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
}
vips_object_local(hook, imagePremultipliedNoAlpha1);
image1 = imagePremultipliedNoAlpha1;
}
if (HasAlpha(image2)) {
VipsImage *imagePremultiplied2;
if (vips_premultiply(image2, &imagePremultiplied2, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
}
vips_object_local(hook, imagePremultiplied2);
VipsImage *imagePremultipliedNoAlpha2;
if (vips_extract_band(image2, &imagePremultipliedNoAlpha2, 1, "n", image2->Bands - 1, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
}
vips_object_local(hook, imagePremultipliedNoAlpha2);
image2 = imagePremultipliedNoAlpha2;
}
// Calculate colour distance
VipsImage *difference;
if (vips_dE00(image1, image2, &difference, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
}
vips_object_local(hook, difference);
// Extract maximum distance
double maxColourDistance;
if (vips_max(difference, &maxColourDistance, nullptr)) {
g_object_unref(hook);
return ThrowError(vips_error_buffer());
try {
// Premultiply and remove alpha
if (HasAlpha(image1)) {
image1 = image1.premultiply().extract_band(1, VImage::option()->set("n", image1.bands() - 1));
}
if (HasAlpha(image2)) {
image2 = image2.premultiply().extract_band(1, VImage::option()->set("n", image2.bands() - 1));
}
// Calculate colour distance
maxColourDistance = image1.dE00(image2).max();
} catch (VError err) {
return ThrowError(err.what());
}
g_object_unref(hook);
// Clean up libvips' per-request data and threads
vips_error_clear();