Skip to main content

Resample

Resize and resampling operations.

Function Mapping​

libvips CDart BindingPipeline MethodPipelineSpec
vips_resize()apiBindings.resize()pipeline.resize()spec.resize()
vips_thumbnail()apiBindings.thumbnail()--
vips_thumbnail_image()apiBindings.thumbnailImage()pipeline.thumbnail()spec.thumbnail()
vips_thumbnail_buffer()apiBindings.thumbnailBuffer()--
vips_reduce()apiBindings.reduce()pipeline.reduce()spec.reduce()
vips_shrink()apiBindings.shrink()pipeline.shrink()spec.shrink()
vips_rotate()apiBindings.rotate()pipeline.rotate()spec.rotate()
vips_affine()resampleBindings.affine()--
vips_similarity()resampleBindings.similarity()--
vips_mapim()resampleBindings.mapim()--
vips_quadratic()resampleBindings.quadratic()--

resize​

Resize an image by scale factor.

C API​

int vips_resize(VipsImage *in, VipsImage **out, double scale, ...);

Dart Binding​

int resize(
  Pointer<VipsImage> in1,
  Pointer<Pointer<VipsImage>> out,
  double scale,
);

Pipeline API​

// By scale factor (0.5 = 50% size, 2.0 = double size)
pipeline.resize(0.5)

thumbnail_image​

Create a thumbnail with smart cropping.

C API​

int vips_thumbnail_image(VipsImage *in, VipsImage **out, int width, ...);

Dart Binding​

int thumbnailImage(
  Pointer<VipsImage> in1,
  Pointer<Pointer<VipsImage>> out,
  int width,
);

Pipeline API​

// Create thumbnail with target width
pipeline.thumbnail(200)

rotate​

Rotate an image by any angle.

C API​

int vips_rotate(VipsImage *in, VipsImage **out, double angle, ...);

Dart Binding​

int rotate(
  Pointer<VipsImage> in1,
  Pointer<Pointer<VipsImage>> out,
  double angle,
);

Pipeline API​

// Rotate by angle in degrees (positive = counter-clockwise)
pipeline.rotate(45)

reduce​

Reduce an image by shrink factors.

C API​

int vips_reduce(VipsImage *in, VipsImage **out, double hshrink, double vshrink, ...);

Dart Binding​

int reduce(
  Pointer<VipsImage> in1,
  Pointer<Pointer<VipsImage>> out,
  double hshrink,
  double vshrink,
);

shrink​

Shrink an image (fast, lower quality).

C API​

int vips_shrink(VipsImage *in, VipsImage **out, double hshrink, double vshrink, ...);

Dart Binding​

int shrink(
  Pointer<VipsImage> in1,
  Pointer<Pointer<VipsImage>> out,
  double hshrink,
  double vshrink,
);