Package org.lwjgl.stb

Class STBImageResize

java.lang.Object

org.lwjgl.stb.STBImageResize

public class STBImageResize
extends Object

Native bindings to stb_image_resize2.h from the stb library.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	STBIR_1CHANNEL	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_2CHANNEL	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_4CHANNEL	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ABGR	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ABGR_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ABGR_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_AR	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_AR_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_AR_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ARGB	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ARGB_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_ARGB_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_BGR	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_BGRA	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_BGRA_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_BGRA_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_EDGE_CLAMP	stbir_edge
static final int	STBIR_EDGE_REFLECT	stbir_edge
static final int	STBIR_EDGE_WRAP	stbir_edge
static final int	STBIR_EDGE_ZERO	stbir_edge
static final int	STBIR_FILTER_BOX	stbir_filter
static final int	STBIR_FILTER_CATMULLROM	stbir_filter
static final int	STBIR_FILTER_CUBICBSPLINE	stbir_filter
static final int	STBIR_FILTER_DEFAULT	stbir_filter
static final int	STBIR_FILTER_MITCHELL	stbir_filter
static final int	STBIR_FILTER_OTHER	stbir_filter
static final int	STBIR_FILTER_POINT_SAMPLE	stbir_filter
static final int	STBIR_FILTER_TRIANGLE	stbir_filter
static final int	STBIR_RA	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RA_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RA_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RGB	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RGBA	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RGBA_NO_AW	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_RGBA_PM	stbir_pixel_layout specifies: number of channels order of channels whether color is premultiplied by alpha
static final int	STBIR_TYPE_FLOAT	stbir_datatype
static final int	STBIR_TYPE_HALF_FLOAT	stbir_datatype
static final int	STBIR_TYPE_UINT16	stbir_datatype
static final int	STBIR_TYPE_UINT8	stbir_datatype
static final int	STBIR_TYPE_UINT8_SRGB	stbir_datatype
static final int	STBIR_TYPE_UINT8_SRGB_ALPHA	stbir_datatype

Method Summary

Modifier and Type	Method	Description
static int	nstbir_build_samplers(long resize)	Unsafe version of: build_samplers
static int	nstbir_build_samplers_with_splits(long resize, int try_splits)	Unsafe version of: build_samplers_with_splits
static void	nstbir_free_samplers(long resize)	Unsafe version of: free_samplers
static long	nstbir_resize(long input_pixels, int input_w, int input_h, int input_stride_in_bytes, long output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_layout, int data_type, int edge, int filter)
static int	nstbir_resize_extended(long resize)	Unsafe version of: resize_extended
static int	nstbir_resize_extended_split(long resize, int split_start, int split_count)	Unsafe version of: resize_extended_split
static long	nstbir_resize_float_linear(long input_pixels, int input_w, int input_h, int input_stride_in_bytes, long output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static void	nstbir_resize_init(long resize, long input_pixels, int input_w, int input_h, int input_stride_in_bytes, long output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_layout, int data_type)
static long	nstbir_resize_uint8_linear(long input_pixels, int input_w, int input_h, int input_stride_in_bytes, long output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static long	nstbir_resize_uint8_srgb(long input_pixels, int input_w, int input_h, int input_stride_in_bytes, long output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static void	nstbir_set_buffer_ptrs(long resize, long input_pixels, int input_stride_in_bytes, long output_pixels, int output_stride_in_bytes)
static void	nstbir_set_datatypes(long resize, int input_type, int output_type)
static int	nstbir_set_edgemodes(long resize, int horizontal_edge, int vertical_edge)
static int	nstbir_set_filter_callbacks(long resize, long horizontal_filter, long horizontal_support, long vertical_filter, long vertical_support)
static int	nstbir_set_filters(long resize, int horizontal_filter, int vertical_filter)
static int	nstbir_set_input_subrect(long resize, double s0, double t0, double s1, double t1)
static int	nstbir_set_non_pm_alpha_speed_over_quality(long resize, int non_pma_alpha_speed_over_quality)	Unsafe version of: set_non_pm_alpha_speed_over_quality
static int	nstbir_set_output_pixel_subrect(long resize, int subx, int suby, int subw, int subh)	Unsafe version of: set_output_pixel_subrect
static void	nstbir_set_pixel_callbacks(long resize, long input_cb, long output_cb)
static int	nstbir_set_pixel_layouts(long resize, int input_pixel_layout, int output_pixel_layout)	Unsafe version of: set_pixel_layouts
static int	nstbir_set_pixel_subrect(long resize, int subx, int suby, int subw, int subh)	Unsafe version of: set_pixel_subrect
static void	nstbir_set_user_data(long resize, long user_data)
static int	stbir_build_samplers(STBIR_RESIZE resize)	Builds the samplers and does one allocation.
static int	stbir_build_samplers_with_splits(STBIR_RESIZE resize, int try_splits)	Build samplers for threading.
static void	stbir_free_samplers(STBIR_RESIZE resize)	You MUST call this, if you call build_samplers or build_samplers_with_splits.
static @Nullable ByteBuffer	stbir_resize(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_layout, int data_type, int edge, int filter)
static @Nullable ByteBuffer	stbir_resize(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_layout, int data_type, int edge, int filter, long length)
static int	stbir_resize_extended(STBIR_RESIZE resize)	The main function to perform the resize synchronously on one thread.
static int	stbir_resize_extended_split(STBIR_RESIZE resize, int split_start, int split_count)	This function does a split of the resizing (you call this fuction for each split, on multiple threads).
static @Nullable FloatBuffer	stbir_resize_float_linear(FloatBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable FloatBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static @Nullable FloatBuffer	stbir_resize_float_linear(FloatBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable FloatBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type, long length)
static void	stbir_resize_init(STBIR_RESIZE resize, ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_layout, int data_type)
static @Nullable ByteBuffer	stbir_resize_uint8_linear(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static @Nullable ByteBuffer	stbir_resize_uint8_linear(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type, long length)
static @Nullable ByteBuffer	stbir_resize_uint8_srgb(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type)
static @Nullable ByteBuffer	stbir_resize_uint8_srgb(ByteBuffer input_pixels, int input_w, int input_h, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_w, int output_h, int output_stride_in_bytes, int pixel_type, long length)
static void	stbir_set_buffer_ptrs(STBIR_RESIZE resize, ByteBuffer input_pixels, int input_stride_in_bytes, @Nullable ByteBuffer output_pixels, int output_stride_in_bytes)
static void	stbir_set_datatypes(STBIR_RESIZE resize, int input_type, int output_type)
static int	stbir_set_edgemodes(STBIR_RESIZE resize, int horizontal_edge, int vertical_edge)
static int	stbir_set_filter_callbacks(STBIR_RESIZE resize, @Nullable STBIRKernelCallbackI horizontal_filter, @Nullable STBIRSupportCallbackI horizontal_support, @Nullable STBIRKernelCallbackI vertical_filter, @Nullable STBIRSupportCallbackI vertical_support)
static int	stbir_set_filters(STBIR_RESIZE resize, int horizontal_filter, int vertical_filter)
static int	stbir_set_input_subrect(STBIR_RESIZE resize, double s0, double t0, double s1, double t1)
static int	stbir_set_non_pm_alpha_speed_over_quality(STBIR_RESIZE resize, boolean non_pma_alpha_speed_over_quality)	When inputting AND outputting non-premultiplied alpha pixels, we use a slower but higher quality technique that fills the zero alpha pixel's RGB values with something plausible.
static int	stbir_set_output_pixel_subrect(STBIR_RESIZE resize, int subx, int suby, int subw, int subh)	Sets output sub-region (full region by default).
static void	stbir_set_pixel_callbacks(STBIR_RESIZE resize, @Nullable STBIRInputCallbackI input_cb, @Nullable STBIROutputCallbackI output_cb)
static int	stbir_set_pixel_layouts(STBIR_RESIZE resize, int input_pixel_layout, int output_pixel_layout)	Sets new buffer layouts.
static int	stbir_set_pixel_subrect(STBIR_RESIZE resize, int subx, int suby, int subw, int subh)	Sets input sub-region (full region by default).
static void	stbir_set_user_data(STBIR_RESIZE resize, long user_data)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

STBIR_1CHANNEL

public static final int STBIR_1CHANNEL

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_2CHANNEL

public static final int STBIR_2CHANNEL

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RGB

public static final int STBIR_RGB

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_BGR

public static final int STBIR_BGR

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_4CHANNEL

public static final int STBIR_4CHANNEL

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RGBA

public static final int STBIR_RGBA

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_BGRA

public static final int STBIR_BGRA

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ARGB

public static final int STBIR_ARGB

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ABGR

public static final int STBIR_ABGR

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RA

public static final int STBIR_RA

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_AR

public static final int STBIR_AR

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RGBA_PM

public static final int STBIR_RGBA_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_BGRA_PM

public static final int STBIR_BGRA_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ARGB_PM

public static final int STBIR_ARGB_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ABGR_PM

public static final int STBIR_ABGR_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RA_PM

public static final int STBIR_RA_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_AR_PM

public static final int STBIR_AR_PM

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RGBA_NO_AW

public static final int STBIR_RGBA_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_BGRA_NO_AW

public static final int STBIR_BGRA_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ARGB_NO_AW

public static final int STBIR_ARGB_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_ABGR_NO_AW

public static final int STBIR_ABGR_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_RA_NO_AW

public static final int STBIR_RA_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_AR_NO_AW

public static final int STBIR_AR_NO_AW

stbir_pixel_layout specifies:

• number of channels
• order of channels
• whether color is premultiplied by alpha

Enum values:

• 1CHANNEL
• 2CHANNEL
• RGB
• BGR
• 4CHANNEL
• RGBA
• BGRA
• ARGB
• ABGR
• RA
• AR
• RGBA_PM
• BGRA_PM
• ARGB_PM
• ABGR_PM
• RA_PM
• AR_PM
• RGBA_NO_AW
• BGRA_NO_AW
• ARGB_NO_AW
• ABGR_NO_AW
• RA_NO_AW
• AR_NO_AW

See Also:

• Constant Field Values

STBIR_EDGE_CLAMP

public static final int STBIR_EDGE_CLAMP

stbir_edge

Enum values:

• EDGE_CLAMP
• EDGE_REFLECT
• EDGE_WRAP - This edge mode is slower and uses more memory.
• EDGE_ZERO

See Also:

• Constant Field Values

STBIR_EDGE_REFLECT

public static final int STBIR_EDGE_REFLECT

stbir_edge

Enum values:

• EDGE_CLAMP
• EDGE_REFLECT
• EDGE_WRAP - This edge mode is slower and uses more memory.
• EDGE_ZERO

See Also:

• Constant Field Values

STBIR_EDGE_WRAP

public static final int STBIR_EDGE_WRAP

stbir_edge

Enum values:

• EDGE_CLAMP
• EDGE_REFLECT
• EDGE_WRAP - This edge mode is slower and uses more memory.
• EDGE_ZERO

See Also:

• Constant Field Values

STBIR_EDGE_ZERO

public static final int STBIR_EDGE_ZERO

stbir_edge

Enum values:

• EDGE_CLAMP
• EDGE_REFLECT
• EDGE_WRAP - This edge mode is slower and uses more memory.
• EDGE_ZERO

See Also:

• Constant Field Values

STBIR_FILTER_DEFAULT

public static final int STBIR_FILTER_DEFAULT

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_BOX

public static final int STBIR_FILTER_BOX

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_TRIANGLE

public static final int STBIR_FILTER_TRIANGLE

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_CUBICBSPLINE

public static final int STBIR_FILTER_CUBICBSPLINE

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_CATMULLROM

public static final int STBIR_FILTER_CATMULLROM

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_MITCHELL

public static final int STBIR_FILTER_MITCHELL

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_POINT_SAMPLE

public static final int STBIR_FILTER_POINT_SAMPLE

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_FILTER_OTHER

public static final int STBIR_FILTER_OTHER

stbir_filter

Enum values:

• FILTER_DEFAULT - Use same filter type that easy-to-use API chooses.
• FILTER_BOX - A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios.
• FILTER_TRIANGLE - On upsampling, produces same results as bilinear texture filtering.
• FILTER_CUBICBSPLINE - The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque.
• FILTER_CATMULLROM - An interpolating cubic spline.
• FILTER_MITCHELL - Mitchell-Netrevalli filter with B=1/3,C=1/3.
• FILTER_POINT_SAMPLE - Simple point sampling.
• FILTER_OTHER - User callback specified.

See Also:

• Constant Field Values

STBIR_TYPE_UINT8

public static final int STBIR_TYPE_UINT8

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

STBIR_TYPE_UINT8_SRGB

public static final int STBIR_TYPE_UINT8_SRGB

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

STBIR_TYPE_UINT8_SRGB_ALPHA

public static final int STBIR_TYPE_UINT8_SRGB_ALPHA

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

STBIR_TYPE_UINT16

public static final int STBIR_TYPE_UINT16

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

STBIR_TYPE_FLOAT

public static final int STBIR_TYPE_FLOAT

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

STBIR_TYPE_HALF_FLOAT

public static final int STBIR_TYPE_HALF_FLOAT

stbir_datatype

Enum values:

• TYPE_UINT8
• TYPE_UINT8_SRGB
• TYPE_UINT8_SRGB_ALPHA - Alpha channel, when present, should also be SRGB (this is very unusual).
• TYPE_UINT16
• TYPE_FLOAT
• TYPE_HALF_FLOAT

See Also:

• Constant Field Values

Method Details

nstbir_resize_uint8_srgb

public static long nstbir_resize_uint8_srgb(long input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 long output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_uint8_srgb

public static @Nullable ByteBuffer stbir_resize_uint8_srgb(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_uint8_srgb

public static @Nullable ByteBuffer stbir_resize_uint8_srgb(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type,
 long length)

nstbir_resize_uint8_linear

public static long nstbir_resize_uint8_linear(long input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 long output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_uint8_linear

public static @Nullable ByteBuffer stbir_resize_uint8_linear(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_uint8_linear

public static @Nullable ByteBuffer stbir_resize_uint8_linear(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type,
 long length)

nstbir_resize_float_linear

public static long nstbir_resize_float_linear(long input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 long output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_float_linear

public static @Nullable FloatBuffer stbir_resize_float_linear(FloatBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable FloatBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type)

stbir_resize_float_linear

public static @Nullable FloatBuffer stbir_resize_float_linear(FloatBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable FloatBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_type,
 long length)

nstbir_resize

public static long nstbir_resize(long input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 long output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_layout,
 int data_type,
 int edge,
 int filter)

stbir_resize

public static @Nullable ByteBuffer stbir_resize(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_layout,
 int data_type,
 int edge,
 int filter)

stbir_resize

public static @Nullable ByteBuffer stbir_resize(ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_layout,
 int data_type,
 int edge,
 int filter,
 long length)

nstbir_resize_init

public static void nstbir_resize_init(long resize,
 long input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 long output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_layout,
 int data_type)

stbir_resize_init

public static void stbir_resize_init(STBIR_RESIZE resize,
 ByteBuffer input_pixels,
 int input_w,
 int input_h,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_w,
 int output_h,
 int output_stride_in_bytes,
 int pixel_layout,
 int data_type)

nstbir_set_datatypes

public static void nstbir_set_datatypes(long resize,
 int input_type,
 int output_type)

stbir_set_datatypes

public static void stbir_set_datatypes(STBIR_RESIZE resize,
 int input_type,
 int output_type)

nstbir_set_pixel_callbacks

public static void nstbir_set_pixel_callbacks(long resize,
 long input_cb,
 long output_cb)

stbir_set_pixel_callbacks

public static void stbir_set_pixel_callbacks(STBIR_RESIZE resize,
 @Nullable STBIRInputCallbackI input_cb,
 @Nullable STBIROutputCallbackI output_cb)

nstbir_set_user_data

public static void nstbir_set_user_data(long resize,
 long user_data)

stbir_set_user_data

public static void stbir_set_user_data(STBIR_RESIZE resize,
 long user_data)

nstbir_set_buffer_ptrs

public static void nstbir_set_buffer_ptrs(long resize,
 long input_pixels,
 int input_stride_in_bytes,
 long output_pixels,
 int output_stride_in_bytes)

stbir_set_buffer_ptrs

public static void stbir_set_buffer_ptrs(STBIR_RESIZE resize,
 ByteBuffer input_pixels,
 int input_stride_in_bytes,
 @Nullable ByteBuffer output_pixels,
 int output_stride_in_bytes)

nstbir_set_pixel_layouts

public static int nstbir_set_pixel_layouts(long resize,
 int input_pixel_layout,
 int output_pixel_layout)

Unsafe version of: set_pixel_layouts

stbir_set_pixel_layouts

public static int stbir_set_pixel_layouts(STBIR_RESIZE resize,
 int input_pixel_layout,
 int output_pixel_layout)

Sets new buffer layouts.

nstbir_set_edgemodes

public static int nstbir_set_edgemodes(long resize,
 int horizontal_edge,
 int vertical_edge)

stbir_set_edgemodes

public static int stbir_set_edgemodes(STBIR_RESIZE resize,
 int horizontal_edge,
 int vertical_edge)

nstbir_set_filters

public static int nstbir_set_filters(long resize,
 int horizontal_filter,
 int vertical_filter)

stbir_set_filters

public static int stbir_set_filters(STBIR_RESIZE resize,
 int horizontal_filter,
 int vertical_filter)

nstbir_set_filter_callbacks

public static int nstbir_set_filter_callbacks(long resize,
 long horizontal_filter,
 long horizontal_support,
 long vertical_filter,
 long vertical_support)

stbir_set_filter_callbacks

public static int stbir_set_filter_callbacks(STBIR_RESIZE resize,
 @Nullable STBIRKernelCallbackI horizontal_filter,
 @Nullable STBIRSupportCallbackI horizontal_support,
 @Nullable STBIRKernelCallbackI vertical_filter,
 @Nullable STBIRSupportCallbackI vertical_support)

nstbir_set_pixel_subrect

public static int nstbir_set_pixel_subrect(long resize,
 int subx,
 int suby,
 int subw,
 int subh)

Unsafe version of: set_pixel_subrect

stbir_set_pixel_subrect

public static int stbir_set_pixel_subrect(STBIR_RESIZE resize,
 int subx,
 int suby,
 int subw,
 int subh)

Sets input sub-region (full region by default).

nstbir_set_input_subrect

public static int nstbir_set_input_subrect(long resize,
 double s0,
 double t0,
 double s1,
 double t1)

stbir_set_input_subrect

public static int stbir_set_input_subrect(STBIR_RESIZE resize,
 double s0,
 double t0,
 double s1,
 double t1)

nstbir_set_output_pixel_subrect

public static int nstbir_set_output_pixel_subrect(long resize,
 int subx,
 int suby,
 int subw,
 int subh)

Unsafe version of: set_output_pixel_subrect

stbir_set_output_pixel_subrect

public static int stbir_set_output_pixel_subrect(STBIR_RESIZE resize,
 int subx,
 int suby,
 int subw,
 int subh)

Sets output sub-region (full region by default).

nstbir_set_non_pm_alpha_speed_over_quality

public static int nstbir_set_non_pm_alpha_speed_over_quality(long resize,
 int non_pma_alpha_speed_over_quality)

Unsafe version of: set_non_pm_alpha_speed_over_quality

stbir_set_non_pm_alpha_speed_over_quality

public static int stbir_set_non_pm_alpha_speed_over_quality(STBIR_RESIZE resize,
 boolean non_pma_alpha_speed_over_quality)

When inputting AND outputting non-premultiplied alpha pixels, we use a slower but higher quality technique that fills the zero alpha pixel's RGB values with something plausible. If you don't care about areas of zero alpha, you can call this function to get about a 25% speed improvement for RGBA to STBIR_RGBA types of resizes.

nstbir_build_samplers

public static int nstbir_build_samplers(long resize)

Unsafe version of: build_samplers

stbir_build_samplers

public static int stbir_build_samplers(STBIR_RESIZE resize)

Builds the samplers and does one allocation.

nstbir_free_samplers

public static void nstbir_free_samplers(long resize)

Unsafe version of: free_samplers

stbir_free_samplers

public static void stbir_free_samplers(STBIR_RESIZE resize)

You MUST call this, if you call build_samplers or build_samplers_with_splits.

nstbir_resize_extended

public static int nstbir_resize_extended(long resize)

Unsafe version of: resize_extended

stbir_resize_extended

public static int stbir_resize_extended(STBIR_RESIZE resize)

The main function to perform the resize synchronously on one thread.

nstbir_build_samplers_with_splits

public static int nstbir_build_samplers_with_splits(long resize,
 int try_splits)

Unsafe version of: build_samplers_with_splits

stbir_build_samplers_with_splits

public static int stbir_build_samplers_with_splits(STBIR_RESIZE resize,
 int try_splits)

Build samplers for threading.

You can pass in the number of threads you'd like to use (try_splits). It returns the number of splits (threads) that you can call it with. It might be less if the image resize can't be split up that many ways.

nstbir_resize_extended_split

public static int nstbir_resize_extended_split(long resize,
 int split_start,
 int split_count)

Unsafe version of: resize_extended_split

stbir_resize_extended_split

public static int stbir_resize_extended_split(STBIR_RESIZE resize,
 int split_start,
 int split_count)

This function does a split of the resizing (you call this fuction for each split, on multiple threads). A split is a piece of the output resize pixel space.

Note that you MUST call build_samplers_with_splits before stbir_resize_extended_split!

Usually, you will always call stbir_resize_extended_split with split_start as the thread_index and "1" for the split_count. But, if you have a weird situation where you MIGHT want 8 threads, but sometimes only 4 threads, you can use 0,2,4,6 for the split_start's and use "2" for the split_count each time to turn in into a 4 thread resize. (This is unusual).