transform(1) AfterStep X11 window manager transform(1)NAMEtransform - transformations available for ASImages libAfterImage/trans‐
form.h
NAMEtransformSYNOPSIS
Defines transformations that could be performed on ASImage.
DESCRIPTION
Transformations can be performed with different degree of quality.
Internal engine uses 24.8 bits per channel per pixel. As the result
there are no precision loss, while performing complex calculations.
Error diffusion algorithms could be used to transform it back into 8
bit without quality loss.
Any Transformation could be performed with the result written directly
into XImage, so that it could be displayed faster.
Complex interpolation algorithms are used to perform scaling
operations, thus yielding very good quality. All the transformations
are performed in integer math, with the result of greater speeds.
Optional MMX inline assembly has been incorporated into some
procedures, and allows to achieve considerably better performance on
compatible CPUs.
SEE ALSO
Transformations :
scale_asimage(), tile_asimage(), merge_layers(),
make_gradient(), flip_asimage(), mirror_asimage(),
pad_asimage(), blur_asimage_gauss(), fill_asimage(),
adjust_asimage_hsv()
Other libAfterImage modules :
ascmap.h asfont.h asimage.h asvisual.h blender.h export.h
import.h transform.h ximage.h
AUTHOR
Sasha Vasko <sasha at aftercode dot net>
NAMEscale_asimage()
- scales source ASImage into new image of requested dimensions.
SYNOPSIS
ASImage *scale_asimage( struct ASVisual *asv,
ASImage *src,
unsigned int to_width,
unsigned int to_height,
ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
to_width
- desired width of the resulting image
to_height
- desired height of the resulting image
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out-
compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTION
If size has to be reduced - then several neighboring pixels will be
averaged into single pixel. If size has to be increased then new
pixels will be interpolated based on values of four neighboring pixels.
EXAMPLE
ASScale
NAMEtile_asimage()
- tiles/crops ASImage to desired size, while optionaly tinting it at
the same time.
SYNOPSIS
ASImage *tile_asimage ( struct ASVisual *asv,
ASImage *src,
int offset_x,
int offset_y,
unsigned int to_width,
unsigned int to_height,
ARGB32 tint,
ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
offset_x
- left clip margin
offset_y
- right clip margin
to_width
- desired width of the resulting image
to_height
- desired height of the resulting image
tint - ARGB32 value describing tinting color.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out-
compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTION
Offset_x and offset_y define origin on source image from which
tiling will start. If offset_x or offset_y is outside of the image
boundaries, then it will be reduced by whole number of image sizes to
fit inside the image. At the time of tiling image will be tinted
unless tint == 0.
EXAMPLE
ASTile
NAMEmerge_layers()SYNOPSIS
ASImage *merge_layers ( struct ASVisual *asv,
ASImageLayer *layers, int count,
unsigned int dst_width,
unsigned int dst_height,
ASAltImFormats out_format,
unsigned int compression_out, int quality);
INPUTS
asv - pointer to valid ASVisual structure
layers - array of ASImageLayer structures that will be rendered one on
top of another. First element corresponds to the bottommost
layer.
dst_width
- desired width of the resulting image
dst_height
- desired height of the resulting image
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out
- compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTIONmerge_layers() will create new ASImage of requested size. It will then
go through all the layers, and fill image with composition.
Bottommost layer will be used unchanged and above layers will be
superimposed on it, using algorithm specified in ASImageLayer
structure of the overlaying layer. Layers may have smaller size
then destination image, and maybe placed in arbitrary locations. Each
layer will be padded to fit width of the destination image with all 0
effectively making it transparent.
NAMEmake_gradient()
- renders linear gradient into new ASImage
SYNOPSIS
ASImage *make_gradient ( struct ASVisual *asv,
struct ASGradient *grad,
unsigned int width,
unsigned int height,
ASFlagType filter,
ASAltImFormats out_format,
unsigned int compression_out, int quality);
INPUTS
asv - pointer to valid ASVisual structure
grad - ASGradient structure defining how gradient should be drawn
width - desired width of the resulting image
height - desired height of the resulting image
filter - only channels corresponding to set bits will be rendered.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out-
compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTIONmake_gradient() will create new image of requested size and it will
fill it with gradient, described in structure pointed to by grad.
Different dithering techniques will be applied to produce nicer
looking gradients.
NAMEflip_asimage()
- rotates ASImage in 90 degree increments
SYNOPSIS
ASImage *flip_asimage ( struct ASVisual *asv,
ASImage *src,
int offset_x, int offset_y,
unsigned int to_width,
unsigned int to_height,
int flip, ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
offset_x
- left clip margin
offset_y
- right clip margin
to_width
- desired width of the resulting image
to_height
- desired height of the resulting image
flip - flip flags determining degree of rotation.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out
- compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTIONflip_asimage() will create new image of requested size, it will then
tile source image based on offset_x, offset_y, and destination size,
and it will rotate it then based on flip value. Three rotation angles
supported 90, 180 and 270 degrees.
NAMEmirror_asimage()SYNOPSIS
ASImage *mirror_asimage ( struct ASVisual *asv,
ASImage *src,
int offset_x, int offset_y,
unsigned int to_width,
unsigned int to_height,
Bool vertical, ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
offset_x
- left clip margin
offset_y
- right clip margin
to_width
- desired width of the resulting image
to_height
- desired height of the resulting image
vertical
- mirror in vertical direction.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out
- compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTIONmirror_asimage() will create new image of requested size, it will then
tile source image based on offset_x, offset_y, and destination size,
and it will mirror it in vertical or horizontal direction.
NAMEpad_asimage()
enlarges ASImage, padding it with specified color on each side in
accordance with requested geometry.
SYNOPSIS
ASImage *pad_asimage( ASVisual *asv, ASImage *src,
int dst_x, int dst_y,
unsigned int to_width,
unsigned int to_height,
ARGB32 color,
ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
dst_x, dst_y - placement of the source image relative to the origin of
destination image
to_width
- width of the destination image
to_height
- height of the destination image
color - ARGB32 color value to pad with.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out
- compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
NAMEblur_asimage_gauss()
Performs Gaussian blurr of the image ( usefull for drop shadows and the
likes ).
SYNOPSIS
ASImage* blur_asimage_gauss( ASVisual* asv, ASImage* src,
double horz, double vert,
ASAltImFormats out_format,
unsigned int compression_out,
int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage
horz - horizontal radius of the blurr
vert - vertical radius of the blurr
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out
- compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
NAMEfill_asimage()
- Fills rectangle within the existing ASImage with specified color.
SYNOPSIS
Bool fill_asimage( ASVisual *asv, ASImage *im,
int x, int y, int width, int height,
ARGB32 color );
INPUTS
asv - pointer to valid ASVisual structure
im - ASImage to fill with the color
x, y - left-top corner of the rectangle to fill.
width, height - size of the rectangle to fill.
color - ARGB32 color value to fill rectangle with.
RETURN VALUE
True on success, False on failure.
NAMEadjust_asimage_hsv()
- adjusts image color properties in HSV colorspace
SYNOPSIS
ASImage *adjust_asimage_hsv( ASVisual *asv, ASImage *src,
int offset_x, int offset_y,
unsigned int to_width,
unsigned int to_height,
unsigned int affected_hue,
unsigned int affected_radius,
int hue_offset, int saturation_offset,
int value_offset,
ASAltImFormats out_format,
unsigned int compression_out, int quality);
INPUTS
asv - pointer to valid ASVisual structure
src - ASImage to adjust colors of.
offset_x,
offset_y
- position on infinite surface tiled with original image, of the
left-top corner of the area to be used for new image.
to_width,
to_height
- size of the area of the original image to be used for new
image.
affected_hue
- hue in degrees in range 0-360. This allows to limit impact of
color adjustment to affect only limited range of hues.
affected_radius
Sets the diapason of the range of affected hues.
hue_offset
- value by which to change hues in affected range.
saturation_offset
- value by which to change saturation of the pixels in affected
hue range.
value_offset
- value by which to change Value(brightness) of pixels in
affected hue range.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out-
compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
returns newly created and encoded ASImage on success, NULL of failure.
DESCRIPTION
This function will tile original image to specified size with offsets
requested, and then it will go though it and adjust hue, saturation and
value of those pixels that have specific hue, set by affected_hue/
affected_radius parameters. When affected_radius is greater then 180
entire image will be adjusted. Note that since grayscale colors have
no hue - the will not get adjusted. Only saturation and value will be
adjusted in gray pixels.
Hue is measured as an angle on a 360 degree circle, The following is
relationship of hue values to regular color names :
red - 0
yellow - 60
green - 120
cyan - 180
blue - 240
magenta - 300
red - 360
All the hue values in parameters will be adjusted to fall withing
0-360 range.
NAMEcolorize_asimage_vector()
creates ASImage from double precision indexed image data - usefull for
scientific visualisation.
SYNOPSIS
Bool colorize_asimage_vector( ASVisual *asv, ASImage *im,
ASVectorPalette *palette,
ASAltImFormats out_format,
int quality );
INPUTS
asv - pointer to valid ASVisual structure
im - ASImage to update.
palette
- palette to be used in conversion of double precision values
into colors.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
quality
- output quality
RETURN VALUE
True on success, False on failure.
DESCRIPTION
This function will try to convert double precision indexed image data
into actuall color image using palette. Original data should be
attached to ASImage using vector member. Operation is relatively fast
and allows representation of scientific data as color image with
dynamically changing palette.
NAMEcreate_asimage_from_vector()
- convinience function allowing to create new ASImage, set its vector
data and colorize it using palette - all in one step.
SYNOPSIS
ASImage *create_asimage_from_vector( ASVisual *asv, double *vector,
unsigned int width,
unsigned int height,
ASVectorPalette *palette,
ASAltImFormats out_format,
unsigned int compression,
int quality );
INPUTS
asv - pointer to valid ASVisual structure
vector - data to be attached to new ASImage and used to generate RGB
image
width, height - size of the new image.
palette
- palette to be used in conversion of double precision values
into colors.
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.
compression_out-
compression level of resulting image in range 0-100.
quality
- output quality
RETURN VALUE
New ASImage on success, NULL on failure.
SEE ALSOcolorize_asimage_vector(), create_asimage(), set_asimage_vector()NAMEslice_asimage2()
- slice ASImage leaving its corners intact, and scaling the middle
part.
SYNOPSIS
ASImage*
slice_asimage2( ASVisual *asv, ASImage *src,
int slice_x_start, int slice_x_end,
int slice_y_start, int slice_y_end,
int to_width,
int to_height,
Bool scaled,
ASAltImFormats out_format,
unsigned int compression_out, int quality );
INPUTS
asv - pointer to valid ASVisual structure
src - source ASImage.
slice_x_start
- ending of the left corners
slice_x_end
- begining of the right corners
slice_y_start
- ending of the top corners
slice_y_end
- begining of the bottom corners
to_width
- width of the generated image;
to_height
- height of the generated image;
scaled - if True - middle part of the image will be scaled, otherwise -
tiled;
out_format
- optionally describes alternative ASImage format that should be
produced as the result - XImage, ARGB32, etc.;
compression_out-
compression level of resulting image in range 0-100;
quality
- output quality.
RETURN VALUE
New ASImage on success, NULL on failure.
SEE ALSOscale_asimage(), tile_asimage()3rd Berkeley Distribution AfterStep v.2.2.11transform(1)
