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Improve thread safety with copy-on-write for metadata #1986

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Lovell Fuller 2019-11-27 23:15:56 +00:00
parent 6ee6a226e1
commit bb15cd9067
4 changed files with 29 additions and 18 deletions
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5
docs/changelog.md
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@ -4,6 +4,11 @@
Requires libvips v8.8.1.
#### v0.23.4 - TBD
* Improve thread safety by using copy-on-write when updating metadata.
[#1986](https://github.com/lovell/sharp/issues/1986)
#### v0.23.3 - 17<sup>th</sup> November 2019
* Ensure `trim` operation supports images contained in the alpha channel.

26
src/common.cc
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@ -277,7 +277,7 @@ namespace sharp {
}
image = VImage::new_from_buffer(descriptor->buffer, descriptor->bufferLength, nullptr, option);
if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
SetDensity(image, descriptor->density);
image = SetDensity(image, descriptor->density);
}
} catch (vips::VError const &err) {
throw vips::VError(std::string("Input buffer has corrupt header: ") + err.what());
@ -323,7 +323,7 @@ namespace sharp {
}
image = VImage::new_from_file(descriptor->file.data(), option);
if (imageType == ImageType::SVG || imageType == ImageType::PDF || imageType == ImageType::MAGICK) {
SetDensity(image, descriptor->density);
image = SetDensity(image, descriptor->density);
}
} catch (vips::VError const &err) {
throw vips::VError(std::string("Input file has corrupt header: ") + err.what());
@ -370,15 +370,19 @@ namespace sharp {
/*
Set EXIF Orientation of image.
*/
void SetExifOrientation(VImage image, int const orientation) {
image.set(VIPS_META_ORIENTATION, orientation);
VImage SetExifOrientation(VImage image, int const orientation) {
VImage copy = image.copy();
copy.set(VIPS_META_ORIENTATION, orientation);
return copy;
}
/*
Remove EXIF Orientation from image.
*/
void RemoveExifOrientation(VImage image) {
vips_image_remove(image.get_image(), VIPS_META_ORIENTATION);
VImage RemoveExifOrientation(VImage image) {
VImage copy = image.copy();
copy.remove(VIPS_META_ORIENTATION);
return copy;
}
/*
@ -398,11 +402,13 @@ namespace sharp {
/*
Set pixels/mm resolution based on a pixels/inch density.
*/
void SetDensity(VImage image, const double density) {
VImage SetDensity(VImage image, const double density) {
const double pixelsPerMm = density / 25.4;
image.set("Xres", pixelsPerMm);
image.set("Yres", pixelsPerMm);
image.set(VIPS_META_RESOLUTION_UNIT, "in");
VImage copy = image.copy();
copy.set("Xres", pixelsPerMm);
copy.set("Yres", pixelsPerMm);
copy.set(VIPS_META_RESOLUTION_UNIT, "in");
return copy;
}
/*

6
src/common.h
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@ -175,12 +175,12 @@ namespace sharp {
/*
Set EXIF Orientation of image.
*/
void SetExifOrientation(VImage image, int const orientation);
VImage SetExifOrientation(VImage image, int const orientation);
/*
Remove EXIF Orientation from image.
*/
void RemoveExifOrientation(VImage image);
VImage RemoveExifOrientation(VImage image);
/*
Does this image have a non-default density?
@ -195,7 +195,7 @@ namespace sharp {
/*
Set pixels/mm resolution based on a pixels/inch density.
*/
void SetDensity(VImage image, const double density);
VImage SetDensity(VImage image, const double density);
/*
Check the proposed format supports the current dimensions.

10
src/pipeline.cc
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@ -104,7 +104,7 @@ class PipelineWorker : public Nan::AsyncWorker {
if (baton->rotateBeforePreExtract) {
if (rotation != VIPS_ANGLE_D0) {
image = image.rot(rotation);
sharp::RemoveExifOrientation(image);
image = sharp::RemoveExifOrientation(image);
}
if (baton->rotationAngle != 0.0) {
std::vector<double> background;
@ -404,20 +404,20 @@ class PipelineWorker : public Nan::AsyncWorker {
// Rotate post-extract 90-angle
if (!baton->rotateBeforePreExtract && rotation != VIPS_ANGLE_D0) {
image = image.rot(rotation);
sharp::RemoveExifOrientation(image);
image = sharp::RemoveExifOrientation(image);
}
// Flip (mirror about Y axis)
if (baton->flip) {
image = image.flip(VIPS_DIRECTION_VERTICAL);
sharp::RemoveExifOrientation(image);
image = sharp::RemoveExifOrientation(image);
}
// Flop (mirror about X axis)
if (baton->flop) {
image = image.flip(VIPS_DIRECTION_HORIZONTAL);
sharp::RemoveExifOrientation(image);
image = sharp::RemoveExifOrientation(image);
}
// Join additional color channels to the image
@ -700,7 +700,7 @@ class PipelineWorker : public Nan::AsyncWorker {
// Override EXIF Orientation tag
if (baton->withMetadata && baton->withMetadataOrientation != -1) {
sharp::SetExifOrientation(image, baton->withMetadataOrientation);
image = sharp::SetExifOrientation(image, baton->withMetadataOrientation);
}
// Number of channels used in output image