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Chapter 2. LqR library API user manual

Table of Contents

Signal handling

Generating the multi-size image

Carver object creation
Carver activation
Choosing the image type

Liquid rescaling

The resizing method
Flattening
Cancelling an action

Reading the multi-size image

Pixel by pixel
One line at a time
Resetting

Automatic feature detection

Foreword
Builtin energy functions
Custom energy functions
Reading out the energy

Adding a bias

Foreword
Adding a bias pixel by pixel
Using an array of floating-point values
Using another image
Operating on a specific area

Adding a rigidity mask

Foreword
Adding an individual rigidity coefficient to a pixel
Using an array of floating-point values
Using another image
Operating on a specific area

Tuning

Setting the enlargement step
Choosing the resize order
Choosing the side switch frequency
Using the cache

Dealing with the visibility maps (the seams)

Dumping the visibility map
Storing the visibility maps
Accessing the internally attached visibility maps
The visibility map objects
Importing a visibility map in a carver
Saving and loading visibility maps to/from files

Attaching extra images

Attaching a carver
Accessing attached carvers

Progress indicators

Creating and attaching a progress report object
Setting up progress hooks
Initial and ending progress messages
Progress update step

Releasing the memory

Signal handling

Many library functions return a value of type LqrRetVal. This is an enum type which can hold the values:

LQR_OK: everyting OK
LQR_ERROR: generic fatal error
LQR_NOMEM: not enough memory
LQR_USRCANCEL: action cancelled by the user

At top level, it is important that the user handle these values explicitly, because the library functions don't do anything else than stopping and returning an error signal in case of errors. An easy way is setting up some macros and wrap each function call with those, as shown in the example files.

Below top level, the library provides some convenient macros which can be used to wrap function calls, in order to propagate these signals:

LQR_CATCH (expr): if expr is equal to LQR_OK it does nothing, otherwise it returns expr (or the result of the execution of expr if it happens to be a function)
LQR_CATCH_F (expr): returns LQR_ERROR if expr is FALSE
LQR_CATCH_MEM (expr): returns LQR_NOMEM if expr is NULL

Note

The names of these macros have changed since version 0.4; the previous names CATCH, CATCH_F and CATCH_MEM are still available, but they can be disabled at configure time if they cause conflicts (configure --help for details).

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