wxImage - Functions for wxImage class
Please see following description for synopsis
wxImage(3) Erlang Module Definition wxImage(3)
NAME
wxImage - Functions for wxImage class
DESCRIPTION
This class encapsulates a platform-independent image.
An image can be created from data, or using wxBitmap:convertToImage/1.
An image can be loaded from a file in a variety of formats, and is
extensible to new formats via image format handlers. Functions are
available to set and get image bits, so it can be used for basic image
manipulation.
A wxImage cannot (currently) be drawn directly to a wxDC. Instead, a
platform-specific wxBitmap object must be created from it using the
wxBitmap::wxBitmap(wxImage,int depth) constructor. This bitmap can then
be drawn in a device context, using wxDC:drawBitmap/4.
More on the difference between wxImage and wxBitmap: wxImage is just a
buffer of RGB bytes with an optional buffer for the alpha bytes. It is
all generic, platform independent and image file format independent
code. It includes generic code for scaling, resizing, clipping, and
other manipulations of the image data. OTOH, wxBitmap is intended to be
a wrapper of whatever is the native image format that is quickest/easi-
est to draw to a DC or to be the target of the drawing operations per-
formed on a wxMemoryDC. By splitting the responsibilities between wxIm-
age/wxBitmap like this then it's easier to use generic code shared by
all platforms and image types for generic operations and platform spe-
cific code where performance or compatibility is needed.
One colour value of the image may be used as a mask colour which will
lead to the automatic creation of a wxMask object associated to the
bitmap object.
Alpha channel support
Starting from wxWidgets 2.5.0 wxImage supports alpha channel data, that
is in addition to a byte for the red, green and blue colour components
for each pixel it also stores a byte representing the pixel opacity.
An alpha value of 0 corresponds to a transparent pixel (null opacity)
while a value of 255 means that the pixel is 100% opaque. The constants
?wxIMAGE_ALPHA_TRANSPARENT and ?wxIMAGE_ALPHA_OPAQUE can be used to
indicate those values in a more readable form.
While all images have RGB data, not all images have an alpha channel.
Before using getAlpha/3 you should check if this image contains an
alpha channel with hasAlpha/1. Currently the BMP, PNG, TGA, and TIFF
format handlers have full alpha channel support for loading so if you
want to use alpha you have to use one of these formats. If you initial-
ize the image alpha channel yourself using setAlpha/4, you should save
it in either PNG, TGA, or TIFF format to avoid losing it as these are
the only handlers that currently support saving with alpha.
Available image handlers
The following image handlers are available. wxBMPHandler is always
installed by default. To use other image formats, install the appropri-
ate handler with wxImage::AddHandler (not implemented in wx) or call
?wxInitAllImageHandlers().
When saving in PCX format, wxPCXHandler (not implemented in wx) will
count the number of different colours in the image; if there are 256 or
less colours, it will save as 8 bit, else it will save as 24 bit.
Loading PNMs only works for ASCII or raw RGB images. When saving in PNM
format, wxPNMHandler (not implemented in wx) will always save as raw
RGB.
Saving GIFs requires images of maximum 8 bpp (see wxQuantize (not
implemented in wx)), and the alpha channel converted to a mask (see
convertAlphaToMask/5). Saving an animated GIF requires images of the
same size (see wxGIFHandler::SaveAnimation (not implemented in wx))
Predefined objects (include wx.hrl): ?wxNullImage
See: wxBitmap, ?wxInitAllImageHandlers(), wxPixelData (not implemented
in wx)
wxWidgets docs: wxImage
DATA TYPES
wxImage() = wx:wx_object()
EXPORTS
new() -> wxImage()
Creates an empty wxImage object without an alpha channel.
new(Name) -> wxImage()
new(Sz) -> wxImage()
Types:
Sz = {W :: integer(), H :: integer()}
new(Width, Height) -> wxImage()
new(Sz, Data) -> wxImage()
new(Name, Height :: [Option]) -> wxImage()
new(Sz, Height :: [Option]) -> wxImage()
Types:
Sz = {W :: integer(), H :: integer()}
Option = {clear, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
new(Width, Height, Data) -> wxImage()
new(Sz, Data, Alpha) -> wxImage()
new(Width, Height, Data :: [Option]) -> wxImage()
new(Name, Mimetype, Data :: [Option]) -> wxImage()
new(Sz, Data, Data :: [Option]) -> wxImage()
Types:
Sz = {W :: integer(), H :: integer()}
Data = binary()
Option = {static_data, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
new(Width, Height, Data, Alpha) -> wxImage()
new(Width, Height, Data, Alpha :: [Option]) -> wxImage()
new(Sz, Data, Alpha, Alpha :: [Option]) -> wxImage()
Types:
Sz = {W :: integer(), H :: integer()}
Data = Alpha = binary()
Option = {static_data, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
new(Width, Height, Data, Alpha, Options :: [Option]) -> wxImage()
Types:
Width = Height = integer()
Data = Alpha = binary()
Option = {static_data, boolean()}
Creates an image from data in memory.
If static_data is false then the wxImage will take ownership of
the data and free it afterwards. For this, it has to be allo-
cated with malloc.
destroy(This :: wxImage()) -> ok
Destructor.
See reference-counted object destruction for more info.
blur(This, BlurRadius) -> wxImage()
Types:
This = wxImage()
BlurRadius = integer()
Blurs the image in both horizontal and vertical directions by
the specified pixel blurRadius.
This should not be used when using a single mask colour for
transparency.
See: blurHorizontal/2, blurVertical/2
blurHorizontal(This, BlurRadius) -> wxImage()
Types:
This = wxImage()
BlurRadius = integer()
Blurs the image in the horizontal direction only.
This should not be used when using a single mask colour for
transparency.
See: blur/2, blurVertical/2
blurVertical(This, BlurRadius) -> wxImage()
Types:
This = wxImage()
BlurRadius = integer()
Blurs the image in the vertical direction only.
This should not be used when using a single mask colour for
transparency.
See: blur/2, blurHorizontal/2
convertAlphaToMask(This) -> boolean()
Types:
This = wxImage()
convertAlphaToMask(This, Options :: [Option]) -> boolean()
Types:
This = wxImage()
Option = {threshold, integer()}
If the image has alpha channel, this method converts it to mask.
If the image has an alpha channel, all pixels with alpha value
less than threshold are replaced with the mask colour and the
alpha channel is removed. Otherwise nothing is done.
The mask colour is chosen automatically using findFirstUnused-
Colour/2, see the overload below if this is not appropriate.
Return: Returns true on success, false on error.
convertAlphaToMask(This, Mr, Mg, Mb) -> boolean()
Types:
This = wxImage()
Mr = Mg = Mb = integer()
convertAlphaToMask(This, Mr, Mg, Mb, Options :: [Option]) ->
boolean()
Types:
This = wxImage()
Mr = Mg = Mb = integer()
Option = {threshold, integer()}
If the image has alpha channel, this method converts it to mask
using the specified colour as the mask colour.
If the image has an alpha channel, all pixels with alpha value
less than threshold are replaced with the mask colour and the
alpha channel is removed. Otherwise nothing is done.
Since: 2.9.0
Return: Returns true on success, false on error.
convertToGreyscale(This) -> wxImage()
Types:
This = wxImage()
Returns a greyscale version of the image.
Since: 2.9.0
convertToGreyscale(This, Weight_r, Weight_g, Weight_b) ->
wxImage()
Types:
This = wxImage()
Weight_r = Weight_g = Weight_b = number()
Returns a greyscale version of the image.
The returned image uses the luminance component of the original
to calculate the greyscale. Defaults to using the standard ITU-T
BT.601 when converting to YUV, where every pixel equals (R *
weight_r) + (G * weight_g) + (B * weight_b).
convertToMono(This, R, G, B) -> wxImage()
Types:
This = wxImage()
R = G = B = integer()
Returns monochromatic version of the image.
The returned image has white colour where the original has
(r,g,b) colour and black colour everywhere else.
copy(This) -> wxImage()
Types:
This = wxImage()
Returns an identical copy of this image.
create(This, Sz) -> boolean()
Types:
This = wxImage()
Sz = {W :: integer(), H :: integer()}
create(This, Width, Height) -> boolean()
create(This, Sz, Data) -> boolean()
create(This, Sz, Height :: [Option]) -> boolean()
Types:
This = wxImage()
Sz = {W :: integer(), H :: integer()}
Option = {clear, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
create(This, Width, Height, Data) -> boolean()
create(This, Sz, Data, Alpha) -> boolean()
create(This, Width, Height, Data :: [Option]) -> boolean()
create(This, Sz, Data, Data :: [Option]) -> boolean()
Types:
This = wxImage()
Sz = {W :: integer(), H :: integer()}
Data = binary()
Option = {static_data, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
create(This, Width, Height, Data, Alpha) -> boolean()
create(This, Width, Height, Data, Alpha :: [Option]) -> boolean()
create(This, Sz, Data, Alpha, Alpha :: [Option]) -> boolean()
Types:
This = wxImage()
Sz = {W :: integer(), H :: integer()}
Data = Alpha = binary()
Option = {static_data, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
create(This, Width, Height, Data, Alpha, Options :: [Option]) ->
boolean()
Types:
This = wxImage()
Width = Height = integer()
Data = Alpha = binary()
Option = {static_data, boolean()}
Creates a fresh image.
See new/5 for more info.
Return: true if the call succeeded, false otherwise.
'Destroy'(This) -> ok
Types:
This = wxImage()
Destroys the image data.
findFirstUnusedColour(This) -> Result
Types:
Result =
{Res :: boolean(),
R :: integer(),
G :: integer(),
B :: integer()}
This = wxImage()
findFirstUnusedColour(This, Options :: [Option]) -> Result
Types:
Result =
{Res :: boolean(),
R :: integer(),
G :: integer(),
B :: integer()}
This = wxImage()
Option =
{startR, integer()} |
{startG, integer()} |
{startB, integer()}
Finds the first colour that is never used in the image.
The search begins at given initial colour and continues by
increasing R, G and B components (in this order) by 1 until an
unused colour is found or the colour space exhausted.
The parameters r, g, b are pointers to variables to save the
colour.
The parameters startR, startG, startB define the initial values
of the colour. The returned colour will have RGB values equal to
or greater than these.
Return: Returns false if there is no unused colour left, true on
success.
Note: This method involves computing the histogram, which is a
computationally intensive operation.
getImageExtWildcard() -> unicode:charlist()
Iterates all registered wxImageHandler (not implemented in wx)
objects, and returns a string containing file extension masks
suitable for passing to file open/save dialog boxes.
Return: The format of the returned string is
"(*.ext1;*.ext2)|*.ext1;*.ext2". It is usually a good idea to
prepend a description before passing the result to the dialog.
Example:
See: wxImageHandler (not implemented in wx)
getAlpha(This) -> binary()
Types:
This = wxImage()
Returns pointer to the array storing the alpha values for this
image.
This pointer is NULL for the images without the alpha channel.
If the image does have it, this pointer may be used to directly
manipulate the alpha values which are stored as the RGB ones.
getAlpha(This, X, Y) -> integer()
Types:
This = wxImage()
X = Y = integer()
Return alpha value at given pixel location.
getBlue(This, X, Y) -> integer()
Types:
This = wxImage()
X = Y = integer()
Returns the blue intensity at the given coordinate.
getData(This) -> binary()
Types:
This = wxImage()
Returns the image data as an array.
This is most often used when doing direct image manipulation.
The return value points to an array of characters in RGBRG-
BRGB... format in the top-to-bottom, left-to-right order, that
is the first RGB triplet corresponds to the first pixel of the
first row, the second one - to the second pixel of the first row
and so on until the end of the first row, with second row fol-
lowing after it and so on.
You should not delete the returned pointer nor pass it to set-
Data/5.
getGreen(This, X, Y) -> integer()
Types:
This = wxImage()
X = Y = integer()
Returns the green intensity at the given coordinate.
getImageCount(Filename) -> integer()
Types:
Filename = unicode:chardata()
getImageCount(Filename, Options :: [Option]) -> integer()
Types:
Filename = unicode:chardata()
Option = {type, wx:wx_enum()}
If the image file contains more than one image and the image
handler is capable of retrieving these individually, this func-
tion will return the number of available images.
For the overload taking the parameter filename, that's the name
of the file to query. For the overload taking the parameter
stream, that's the opened input stream with image data.
See wxImageHandler::GetImageCount() (not implemented in wx) for
more info.
The parameter type may be one of the following values:
Return: Number of available images. For most image handlers,
this is 1 (exceptions are TIFF and ICO formats as well as ani-
mated GIFs for which this function returns the number of frames
in the animation).
getHeight(This) -> integer()
Types:
This = wxImage()
Gets the height of the image in pixels.
See: getWidth/1, GetSize() (not implemented in wx)
getMaskBlue(This) -> integer()
Types:
This = wxImage()
Gets the blue value of the mask colour.
getMaskGreen(This) -> integer()
Types:
This = wxImage()
Gets the green value of the mask colour.
getMaskRed(This) -> integer()
Types:
This = wxImage()
Gets the red value of the mask colour.
getOrFindMaskColour(This) -> Result
Types:
Result =
{Res :: boolean(),
R :: integer(),
G :: integer(),
B :: integer()}
This = wxImage()
Get the current mask colour or find a suitable unused colour
that could be used as a mask colour.
Returns true if the image currently has a mask.
getPalette(This) -> wxPalette:wxPalette()
Types:
This = wxImage()
Returns the palette associated with the image.
Currently the palette is only used when converting to wxBitmap
under Windows.
Some of the wxImage handlers have been modified to set the pal-
ette if one exists in the image file (usually 256 or less colour
images in GIF or PNG format).
getRed(This, X, Y) -> integer()
Types:
This = wxImage()
X = Y = integer()
Returns the red intensity at the given coordinate.
getSubImage(This, Rect) -> wxImage()
Types:
This = wxImage()
Rect =
{X :: integer(),
Y :: integer(),
W :: integer(),
H :: integer()}
Returns a sub image of the current one as long as the rect
belongs entirely to the image.
getWidth(This) -> integer()
Types:
This = wxImage()
Gets the width of the image in pixels.
See: getHeight/1, GetSize() (not implemented in wx)
hasAlpha(This) -> boolean()
Types:
This = wxImage()
Returns true if this image has alpha channel, false otherwise.
See: getAlpha/3, setAlpha/4
hasMask(This) -> boolean()
Types:
This = wxImage()
Returns true if there is a mask active, false otherwise.
getOption(This, Name) -> unicode:charlist()
Types:
This = wxImage()
Name = unicode:chardata()
Gets a user-defined string-valued option.
Generic options:
Options specific to wxGIFHandler (not implemented in wx):
Return: The value of the option or an empty string if not found.
Use hasOption/2 if an empty string can be a valid option value.
See: setOption/3, getOptionInt/2, hasOption/2
getOptionInt(This, Name) -> integer()
Types:
This = wxImage()
Name = unicode:chardata()
Gets a user-defined integer-valued option.
The function is case-insensitive to name. If the given option is
not present, the function returns 0. Use hasOption/2 if 0 is a
possibly valid value for the option.
Generic options:
Since: 2.9.3
Options specific to wxPNGHandler (not implemented in wx):
Options specific to wxTIFFHandler (not implemented in wx):
Options specific to wxGIFHandler (not implemented in wx):
Note: Be careful when combining the options wxIM-
AGE_OPTION_TIFF_SAMPLESPERPIXEL, wxIMAGE_OPTION_TIFF_BITSPERSAM-
PLE, and wxIMAGE_OPTION_TIFF_PHOTOMETRIC. While some measures
are taken to prevent illegal combinations and/or values, it is
still easy to abuse them and come up with invalid results in the
form of either corrupted images or crashes.
Return: The value of the option or 0 if not found. Use hasOp-
tion/2 if 0 can be a valid option value.
See: setOption/3, getOption/2
hasOption(This, Name) -> boolean()
Types:
This = wxImage()
Name = unicode:chardata()
Returns true if the given option is present.
The function is case-insensitive to name.
The lists of the currently supported options are in getOption/2
and getOptionInt/2 function docs.
See: setOption/3, getOption/2, getOptionInt/2
initAlpha(This) -> ok
Types:
This = wxImage()
Initializes the image alpha channel data.
It is an error to call it if the image already has alpha data.
If it doesn't, alpha data will be by default initialized to all
pixels being fully opaque. But if the image has a mask colour,
all mask pixels will be completely transparent.
initStandardHandlers() -> ok
Internal use only.
Adds standard image format handlers. It only install wxBMPHan-
dler for the time being, which is used by wxBitmap.
This function is called by wxWidgets on startup, and shouldn't
be called by the user.
See: wxImageHandler (not implemented in wx), ?wxInitAllImageHan-
dlers(), wxQuantize (not implemented in wx)
isTransparent(This, X, Y) -> boolean()
Types:
This = wxImage()
X = Y = integer()
isTransparent(This, X, Y, Options :: [Option]) -> boolean()
Types:
This = wxImage()
X = Y = integer()
Option = {threshold, integer()}
Returns true if the given pixel is transparent, i.e. either has
the mask colour if this image has a mask or if this image has
alpha channel and alpha value of this pixel is strictly less
than threshold.
loadFile(This, Name) -> boolean()
Types:
This = wxImage()
Name = unicode:chardata()
loadFile(This, Name, Options :: [Option]) -> boolean()
Types:
This = wxImage()
Name = unicode:chardata()
Option = {type, wx:wx_enum()} | {index, integer()}
Loads an image from a file.
If no handler type is provided, the library will try to autode-
tect the format.
loadFile(This, Name, Mimetype, Options :: [Option]) -> boolean()
Types:
This = wxImage()
Name = Mimetype = unicode:chardata()
Option = {index, integer()}
Loads an image from a file.
If no handler type is provided, the library will try to autode-
tect the format.
ok(This) -> boolean()
Types:
This = wxImage()
See: isOk/1.
isOk(This) -> boolean()
Types:
This = wxImage()
Returns true if image data is present.
removeHandler(Name) -> boolean()
Types:
Name = unicode:chardata()
Finds the handler with the given name, and removes it.
The handler is also deleted.
Return: true if the handler was found and removed, false other-
wise.
See: wxImageHandler (not implemented in wx)
mirror(This) -> wxImage()
Types:
This = wxImage()
mirror(This, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Option = {horizontally, boolean()}
Returns a mirrored copy of the image.
The parameter horizontally indicates the orientation.
replace(This, R1, G1, B1, R2, G2, B2) -> ok
Types:
This = wxImage()
R1 = G1 = B1 = R2 = G2 = B2 = integer()
Replaces the colour specified by r1,g1,b1 by the colour
r2,g2,b2.
rescale(This, Width, Height) -> wxImage()
Types:
This = wxImage()
Width = Height = integer()
rescale(This, Width, Height, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Width = Height = integer()
Option = {quality, wx:wx_enum()}
Changes the size of the image in-place by scaling it: after a
call to this function,the image will have the given width and
height.
For a description of the quality parameter, see the scale/4
function. Returns the (modified) image itself.
See: scale/4
resize(This, Size, Pos) -> wxImage()
Types:
This = wxImage()
Size = {W :: integer(), H :: integer()}
Pos = {X :: integer(), Y :: integer()}
resize(This, Size, Pos, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Size = {W :: integer(), H :: integer()}
Pos = {X :: integer(), Y :: integer()}
Option = {r, integer()} | {g, integer()} | {b, integer()}
Changes the size of the image in-place without scaling it by
adding either a border with the given colour or cropping as nec-
essary.
The image is pasted into a new image with the given size and
background colour at the position pos relative to the upper left
of the new image.
If red = green = blue = -1 then use either the current mask
colour if set or find, use, and set a suitable mask colour for
any newly exposed areas.
Return: The (modified) image itself.
See: size/4
rotate(This, Angle, RotationCentre) -> wxImage()
Types:
This = wxImage()
Angle = number()
RotationCentre = {X :: integer(), Y :: integer()}
rotate(This, Angle, RotationCentre, Options :: [Option]) ->
wxImage()
Types:
This = wxImage()
Angle = number()
RotationCentre = {X :: integer(), Y :: integer()}
Option =
{interpolating, boolean()} |
{offset_after_rotation, {X :: integer(), Y :: integer()}}
Rotates the image about the given point, by angle radians.
Passing true to interpolating results in better image quality,
but is slower.
If the image has a mask, then the mask colour is used for the
uncovered pixels in the rotated image background. Else, black
(rgb 0, 0, 0) will be used.
Returns the rotated image, leaving this image intact.
rotateHue(This, Angle) -> ok
Types:
This = wxImage()
Angle = number()
Rotates the hue of each pixel in the image by angle, which is a
double in the range of -1.0 to +1.0, where -1.0 corresponds to
-360 degrees and +1.0 corresponds to +360 degrees.
rotate90(This) -> wxImage()
Types:
This = wxImage()
rotate90(This, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Option = {clockwise, boolean()}
Returns a copy of the image rotated 90 degrees in the direction
indicated by clockwise.
saveFile(This, Name) -> boolean()
Types:
This = wxImage()
Name = unicode:chardata()
Saves an image in the named file.
File type is determined from the extension of the file name.
Note that this function may fail if the extension is not recog-
nized! You can use one of the forms above to save images to
files with non-standard extensions.
saveFile(This, Name, Type) -> boolean()
saveFile(This, Name, Mimetype) -> boolean()
Types:
This = wxImage()
Name = Mimetype = unicode:chardata()
Saves an image in the named file.
scale(This, Width, Height) -> wxImage()
Types:
This = wxImage()
Width = Height = integer()
scale(This, Width, Height, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Width = Height = integer()
Option = {quality, wx:wx_enum()}
Returns a scaled version of the image.
This is also useful for scaling bitmaps in general as the only
other way to scale bitmaps is to blit a wxMemoryDC into another
wxMemoryDC.
The parameter quality determines what method to use for resam-
pling the image, see wxImageResizeQuality documentation.
It should be noted that although using wxIMAGE_QUALITY_HIGH pro-
duces much nicer looking results it is a slower method. Downsam-
pling will use the box averaging method which seems to operate
very fast. If you are upsampling larger images using this method
you will most likely notice that it is a bit slower and in
extreme cases it will be quite substantially slower as the bicu-
bic algorithm has to process a lot of data.
It should also be noted that the high quality scaling may not
work as expected when using a single mask colour for trans-
parency, as the scaling will blur the image and will therefore
remove the mask partially. Using the alpha channel will work.
Example:
See: rescale/4
size(This, Size, Pos) -> wxImage()
Types:
This = wxImage()
Size = {W :: integer(), H :: integer()}
Pos = {X :: integer(), Y :: integer()}
size(This, Size, Pos, Options :: [Option]) -> wxImage()
Types:
This = wxImage()
Size = {W :: integer(), H :: integer()}
Pos = {X :: integer(), Y :: integer()}
Option = {r, integer()} | {g, integer()} | {b, integer()}
Returns a resized version of this image without scaling it by
adding either a border with the given colour or cropping as nec-
essary.
The image is pasted into a new image with the given size and
background colour at the position pos relative to the upper left
of the new image.
If red = green = blue = -1 then the areas of the larger image
not covered by this image are made transparent by filling them
with the image mask colour (which will be allocated automati-
cally if it isn't currently set).
Otherwise, the areas will be filled with the colour with the
specified RGB components.
See: resize/4
setAlpha(This, Alpha) -> ok
Types:
This = wxImage()
Alpha = binary()
setAlpha(This, Alpha, Options :: [Option]) -> ok
Types:
This = wxImage()
Alpha = binary()
Option = {static_data, boolean()}
This function is similar to setData/5 and has similar restric-
tions.
The pointer passed to it may however be NULL in which case the
function will allocate the alpha array internally - this is use-
ful to add alpha channel data to an image which doesn't have
any.
If the pointer is not NULL, it must have one byte for each image
pixel and be allocated with malloc(). wxImage takes ownership of
the pointer and will free it unless static_data parameter is set
to true - in this case the caller should do it.
setAlpha(This, X, Y, Alpha) -> ok
Types:
This = wxImage()
X = Y = Alpha = integer()
Sets the alpha value for the given pixel.
This function should only be called if the image has alpha chan-
nel data, use hasAlpha/1 to check for this.
setData(This, Data) -> ok
Types:
This = wxImage()
Data = binary()
setData(This, Data, Options :: [Option]) -> ok
Types:
This = wxImage()
Data = binary()
Option = {static_data, boolean()}
Sets the image data without performing checks.
The data given must have the size (width*height*3) or results
will be unexpected. Don't use this method if you aren't sure you
know what you are doing.
The data must have been allocated with malloc(), NOT with opera-
tor new.
If static_data is false, after this call the pointer to the data
is owned by the wxImage object, that will be responsible for
deleting it. Do not pass to this function a pointer obtained
through getData/1.
setData(This, Data, New_width, New_height) -> ok
Types:
This = wxImage()
Data = binary()
New_width = New_height = integer()
setData(This, Data, New_width, New_height, Options :: [Option]) ->
ok
Types:
This = wxImage()
Data = binary()
New_width = New_height = integer()
Option = {static_data, boolean()}
This is an overloaded member function, provided for convenience.
It differs from the above function only in what argument(s) it
accepts.
setMask(This) -> ok
Types:
This = wxImage()
setMask(This, Options :: [Option]) -> ok
Types:
This = wxImage()
Option = {mask, boolean()}
Specifies whether there is a mask or not.
The area of the mask is determined by the current mask colour.
setMaskColour(This, Red, Green, Blue) -> ok
Types:
This = wxImage()
Red = Green = Blue = integer()
Sets the mask colour for this image (and tells the image to use
the mask).
setMaskFromImage(This, Mask, Mr, Mg, Mb) -> boolean()
Types:
This = Mask = wxImage()
Mr = Mg = Mb = integer()
Sets image's mask so that the pixels that have RGB value of
mr,mg,mb in mask will be masked in the image.
This is done by first finding an unused colour in the image,
setting this colour as the mask colour and then using this
colour to draw all pixels in the image who corresponding pixel
in mask has given RGB value.
The parameter mask is the mask image to extract mask shape from.
It must have the same dimensions as the image.
The parameters mr, mg, mb are the RGB values of the pixels in
mask that will be used to create the mask.
Return: Returns false if mask does not have same dimensions as
the image or if there is no unused colour left. Returns true if
the mask was successfully applied.
Note: Note that this method involves computing the histogram,
which is a computationally intensive operation.
setOption(This, Name, Value) -> ok
setOption(This, Name, Value) -> ok
Types:
This = wxImage()
Name = Value = unicode:chardata()
Sets a user-defined option.
The function is case-insensitive to name.
For example, when saving as a JPEG file, the option quality is
used, which is a number between 0 and 100 (0 is terrible, 100 is
very good).
The lists of the currently supported options are in getOption/2
and getOptionInt/2 function docs.
See: getOption/2, getOptionInt/2, hasOption/2
setPalette(This, Palette) -> ok
Types:
This = wxImage()
Palette = wxPalette:wxPalette()
Associates a palette with the image.
The palette may be used when converting wxImage to wxBitmap (MSW
only at present) or in file save operations (none as yet).
setRGB(This, Rect, Red, Green, Blue) -> ok
Types:
This = wxImage()
Rect =
{X :: integer(),
Y :: integer(),
W :: integer(),
H :: integer()}
Red = Green = Blue = integer()
Sets the colour of the pixels within the given rectangle.
This routine performs bounds-checks for the coordinate so it can
be considered a safe way to manipulate the data.
setRGB(This, X, Y, R, G, B) -> ok
Types:
This = wxImage()
X = Y = R = G = B = integer()
Set the color of the pixel at the given x and y coordinate.
wxWidgets team. wx 2.1.1 wxImage(3)