IlvBitmap Class Reference

Port class. More...

#include <ilviews/base/port.h>

Inheritance diagram for IlvBitmap:

Public Member Functions
	IlvBitmap (IlvDisplay *display, IlvDim width, IlvDim height, IlUShort depth, unsigned char *data, IlBoolean bitOrder=IlTrue, IlUShort padding=32)
	Constructor. More...
	IlvBitmap (IlvDisplay *display, IlvDim width, IlvDim height, IlUShort depth)
	Constructor. More...
	IlvBitmap (IlvDisplay *display, IlvWindowsHandle hBitmap, IlBoolean owner=IlFalse)
	Constructor from an HBITMAP. More...
IlBoolean	computeMask ()
	Computes the mask of this bitmap. More...
IlUShort	depth () const
	Retrieves the depth of this bitmap. More...
IlvBitmapAnimationHandler *	getAnimationHandler () const
	Returns the animation handler connected to this bitmap. More...
IlvBitmap *	getMask () const
	Retrieves the mask of this bitmap. More...
const char *	getName () const
	Retrieves the name of this bitmap. More...
IlInt	getTransparentColorIndex () const
	Retrieves the transparent color of this bitmap. More...
virtual IlBoolean	isABitmap () const
	Queries the nature of this port. More...
void	lock ()
	Locks the bitmap. More...
virtual IlBoolean	save (const char *filename) const
	Saves the bitmap to a file. More...
virtual IlBoolean	save (ostream &stream) const
	Saves a bitmap to a stream. More...
IlBoolean	saveAscii (const char *filename) const
	Saves an ASCII representation of this bitmap to a file. More...
void	setAnimationHandler (IlvBitmapAnimationHandler *handler)
	Sets the animation handler connected to this bitmap. More...
void	setMask (IlvBitmap *mask)
	Sets the mask of this bitmap. More...
void	setName (const char *name)
	Sets the name of this bitmap. More...
void	setTransparentColorIndex (IlInt tcIndex)
	Sets the transparent color of this bitmap. More...
void	unLock ()
	Unlocks the bitmap. More...
void	useColor (IlvColor *color)
	Verbose: More...
Public Member Functions inherited from IlvSystemPort
	IlvSystemPort (IlvDisplay *display, IlvWindowsHandle HDC, IlvDim width=0, IlvDim height=0)
	Windows-specific constructor. More...
virtual void	clearArea (const IlvRect &, IlBoolean=IlFalse) const
	Clears a rectangular area of the screen. More...
virtual void	clearArea (const IlvRegion &, IlBoolean=IlFalse) const
	Clears a region of the screen. More...
virtual void	clip (const IlvRect *) const
	Limits the drawing to the given rectangular area. More...
virtual void	clip (const IlvRegion *) const
	Limits the drawing to the given region. More...
virtual void	drawArc (const IlvPalette *, const IlvRect &, IlFloat, IlFloat) const
	Draws an arc. More...
virtual void	drawBitmap (const IlvPalette *, const IlvSystemPort *, const IlvRect &, const IlvPoint &) const
	Draws an image. More...
virtual void	drawBitmap (const IlvPalette *, const IlvBitmap *, const IlvRect &, const IlvRegion *=0, IlvPosition=IlvCenter, IlBoolean=IlFalse) const
	Draws an image. More...
virtual void	drawIString (const IlvPalette *, const IlvPoint &, const char *, int, IlvPosition=IlvLeft) const
	Draws a string at the given position. More...
virtual void	drawLine (const IlvPalette *, const IlvPoint &, const IlvPoint &) const
	Draws a line between 2 points. More...
virtual void	drawPoint (const IlvPalette *, const IlvPoint &) const
	Draws a point at the given position. More...
virtual void	drawPoints (const IlvPalette *, IlUInt, const IlvPoint *) const
	Draws a series of points. More...
virtual void	drawPolyLine (const IlvPalette *, IlUInt, const IlvPoint *) const
	Draws a series of connected lines. More...
virtual void	drawPolyLine (const IlvPalette *, const IlvPoint &, IlUInt, const IlvDeltaPoint *) const
	Draws a series of connected lines relatively to a reference. More...
virtual void	drawRectangle (const IlvPalette *, const IlvRect &) const
	Draws the given rectangle. More...
virtual void	drawRoundRectangle (const IlvPalette *, const IlvRect &, IlUShort) const
	Draws a round rectangle. More...
virtual void	drawSegments (const IlvPalette *, IlUInt, const IlvPoint *, const IlvPoint *) const
	Draws a set of segments. More...
virtual void	drawString (const IlvPalette *, const IlvPoint &, const char *, int, IlvPosition=IlvLeft) const
	Draws a string at the given position. More...
virtual void	drawTransformedString (const IlvPalette *, const char *, int, const IlvTransformer &, const IlvRegion *=0) const
	Draws a transformed string. More...
virtual void	drawTransparentBitmap (const IlvPalette *, const IlvSystemPort *, const IlvRect &, const IlvPoint &) const
	Draws a transparent bitmap. More...
virtual void	end ()
	Closed the dump device. More...
virtual void	fillArc (const IlvPalette *, const IlvRect &, IlFloat, IlFloat) const
	Fills the arc. More...
virtual void	fillPaths (const IlvPalette *, IlUInt, const IlvPointArray *) const
	Fills the shape defined by the given paths. More...
virtual void	fillPolyLine (const IlvPalette *, IlUInt, const IlvPoint *, IlBoolean=IlFalse) const
	Fills a polygon. More...
virtual void	fillPolyLine (const IlvPalette *, const IlvPoint &, IlUInt, const IlvDeltaPoint *, IlBoolean=IlFalse) const
	Fills a polygon. More...
virtual void	fillRectangle (const IlvPalette *, const IlvRect &) const
	Fills the given rectangle. More...
virtual void	fillRoundRectangle (const IlvPalette *, const IlvRect &, IlUShort) const
	Fills a round rectangle. More...
IlvWindowsHandle	getDC () const
	Gets the Windows Handle Device Context. More...
virtual IlBoolean	initDevice (const char *, IlvRect *=0)
	Initializes the dump device. More...
virtual IlBoolean	isASystemPort () const
	Indicates that this port is a true system port (not a dump device). More...
virtual IlBoolean	isBad () const
	Indicates whether this port is valid. More...
virtual IlBoolean	newPage () const
	Produces an output page and prepares for a new page. More...
void	releaseDC ()
	Releases the Windows Handle Device Context. More...
virtual void	send (const char *) const
	Sends character strings to an output device. More...
virtual void	setTransformer (const IlvTransformer &)
	Applies another transformer to the coordinates provided for the drawing functions. More...
virtual void	stretchBitmap (const IlvPalette *, const IlvPoint &, const IlvBitmap *, const IlvTransformer &, const IlvRect *=0) const
	Stretches a bitmap. More...
virtual void	stretchBitmap (const IlvPalette *, const IlvRect &, const IlvBitmap *, const IlvRect *=0) const
	Stretches a bitmap. More...
virtual void	stretchBitmapData (const IlvPalette *palette, const IlvBitmapData *src, const IlvRect &from, const IlvRect &to, IlBoolean opaque=IlFalse) const
	Draws a bitmap data. More...
virtual void	stretchTransparentBitmap (const IlvPalette *, const IlvPoint &, const IlvBitmap *, const IlvTransformer &, const IlvRect *=0) const
	Stretches a transparent bitmap. More...
virtual void	stretchTransparentBitmap (const IlvPalette *, const IlvRect &, const IlvBitmap *, const IlvRect *=0) const
	Stretches a transparent bitmap. More...
Public Member Functions inherited from IlvPort
	IlvPort (IlvDisplay *display=0)
	Constructor. More...
void	composeAlpha (IlvIntensity alpha)
	Composes the current alpha value of the port. More...
virtual void	drawArrow (const IlvPalette *palette, const IlvPoint &from, const IlvPoint &to, IlFloat position) const
	Draws an arrow. More...
virtual void	drawBezier (const IlvPalette *palette, IlUInt count, const IlvPoint *points) const
	Draws a set of Bzier curves. More...
virtual void	drawClosedBezier (const IlvPalette *palette, IlUInt count, const IlvPoint *points) const
	Appends a closing curve to a set of Bézier curves. More...
virtual void	drawILabel (const IlvPalette *palette, const char *label, int length, const IlvRect &drawRect, const IlvRegion *clip=0, IlvPosition align=IlvCenter) const
	Draws a label in a rectangle. More...
virtual void	drawLabel (const IlvPalette *palette, const char *label, int length, const IlvRect &drawRect, const IlvRegion *clip=0, IlvPosition align=IlvCenter) const
	Draws a label in a rectangle. More...
virtual void	drawMarker (const IlvPalette *palette, const IlvPoint &location, IlvMarkerType type=IlvMarkerSquare, IlUShort size=IlvDefaultMarkerSize) const
	Draws a marker. More...
virtual void	drawMnemonicLabel (const IlvPalette *palette, const char *label, const IlvRect &drawRect, const IlvRegion *clip=0, IlvPosition align=IlvCenter, IlBoolean underline=IlTrue) const
	Draws an underlined letter in a label. More...
virtual void	drawOutlineRectangle (const IlvPalette *outlinePalette, const IlvPalette *fillPalette, const IlvRect &rect, const IlvRegion *clip=0) const
	Draws a rectangle with border effects. More...
virtual void	drawPaths (const IlvPalette *palette, IlUInt count, const IlvPointArray *paths) const
	Draws an array of paths as polylines. More...
virtual void	drawReliefDiamond (const IlvPalette *, const IlvPalette *invertedPalette, const IlvPalette *topShade, const IlvPalette *bottomShade, const IlvRect &bbox, IlUShort thickness, const IlvRegion *clip=0) const
	Draws a diamond with depth effects. More...
virtual void	drawReliefRectangle (const IlvPalette *palette, const IlvPalette *invertedPalette, const IlvPalette *topShade, const IlvPalette *bottomShade, const IlvRect &bbox, IlUShort thickness, const IlvRegion *clip=0) const
	Draws a filled rectangle with depth effects. More...
virtual void	drawShadowRectangle (const IlvPalette *palette, const IlvPalette *invertedPalette, const IlvRect &bbox, IlUShort thickness, IlvPosition shadowPosition, const IlvRegion *clip=0) const
	Draws a filled rectangle with its shadow. More...
virtual void	fillBezier (const IlvPalette *palette, IlUInt count, const IlvPoint *points) const
	Fills an area specified by a set of Bézier curves. More...
IlvIntensity	getAlpha () const
	Provides the alpha value of the port. More...
IlvAntialiasingMode	getAntialiasingMode () const
	Provides the anti-aliasing mode of the port. More...
IlvDisplay *	getDisplay () const
	Returns a pointer to the IlvDisplay of this port. More...
IlvDim	height () const
	Provides the height of the port. More...
virtual IlBoolean	isADevice () const
	Indicates that this port is a dump device. More...
void	setAlpha (IlvIntensity alpha)
	Sets the alpha value of the port. More...
void	setAntialiasingMode (IlvAntialiasingMode mode)
	Sets the anti-aliasing mode of the port. More...
void	size (IlvDim &w, IlvDim &h) const
	Gives the dimensions of the port. More...
IlvDim	width () const
	Provides the width of the port. More...

Friends
class	IlvDisplay

Additional Inherited Members
Static Public Member Functions inherited from IlvSystemPort
static IlvBitmapData *	GetBitmapData (IlvSystemPort *port, const IlvRect *rect=0)
	Creates an IlvBitmapData from a rectangular area in an IlvSystemPort. More...

Detailed Description

Port class.

Library: display

Instances of the IlvBitmap class are rectangular areas that store a group of pixels that make an image. These images can be in full color. In this case, each pixel value represents a color index when your display system has no true-color capabilities. To find the exact color that will be displayed for this pixel, the system lookup table is consulted. If your display system has true color capabilities, then each pixel of the bitmap stores its complete color information.

Also, images can be monochrome. In this case, there is only one bit per pixel, and the drawing of these one-bit-deep bitmaps will take place by setting the 1 pixels to the foreground color of the palette that is used, and the 0 pixels will be set to the background color of this palette or left unchanged.

A colored bitmap can be associated a mask. A mask is a monochrome bitmap that indicates which of the pixels in the actual source image will be displayed. The pixels in the bitmap that correspond to '0' bits in the mask will be capable of not being displayed, achieving the effect of a transparent bitmap, that is, a color bitmap that has transparent parts.

Because IlvBitmap derives from IlvPort, you can actually draw into bitmap using the member functions of its parent classes. Most of the time, though, a bitmap is made from the conversion of a data file using an IlvBitmapStreamer.

See Also

IlvBitmapData, IlvBitmapStreamer, IlvIcon, IlvTransparentIcon, IlvZoomableIcon, IlvZoomableTransparentIcon.

Constructor & Destructor Documentation

IlvBitmap::IlvBitmap	(	IlvDisplay *	display,
		IlvDim	width,
		IlvDim	height,
		IlUShort	depth,
		unsigned char *	data,
		IlBoolean	bitOrder = IlTrue,
		IlUShort	padding = 32
	)

Constructor.

Initializes an empty image. Its content is unpredictable but the memory area to hold a future valid image is allocated and made available.

Parameters

display	The display where this bitmap is created.
width	The width of this new bitmap.
height	The height of this new bitmap.
depth	The depth of this new bitmap, that is, how many bits should be used to hold the pixel value of each individual image element. This can be either 1 for monochrome bitmaps, or the depth of the display as returned by calling display->screenDepth().
data	The initial data that initializes the bitmap pixel. This data must respect the following rules: The whole image is given as a series of scan lines from image top to bottom. The pixel values are packed into bytes from left to right, and each scan line must be padded to padding bits. The bits are packed into padding bit words from left to right with a bit order defined by bitOrder. The data may be composed in three different ways - either successive bytes or successive 32-bit integers - depending on the display depth: If depth is 1, the data must be made of successive bytes, where each bit describes a pixel of the image. If depth is greater than 1 but less than or equal to 8, the bitmap uses a lookup color table (also called color map) and each byte of data gives the index in this color map where the actual color value can be found. If depth is strictly greater than 8, the data must be made of successive 32-bit integers in MSB format. In that case, each of the three color components consists of 8-bits. These three bytes must be packed into 32 bits in this way: value = (red << 16) | (green << 8) | blue
bitOrder	Indicates the bit order of the data. The data bits are considered most significant bits first if bitOrder is IlTrue, or least significant bits first if bitOrder is set to IlFalse.
padding	The padding value. The length of each scan line in data must be a multiple of this value.

IlvBitmap::IlvBitmap	(	IlvDisplay *	display,
		IlvDim	width,
		IlvDim	height,
		IlUShort	depth
	)

Constructor.

Initializes a bitmap that has the indicated size and depth. The initial contents are unpredictable.

Parameters

display	The display where this bitmap is created.
width	The width of this new bitmap.
height	The height of this new bitmap.
depth	The depth of this new bitmap, that is, how many bits should be used to hold the pixel value of each individual image element. This can be either 1 for monochrome bitmaps, or the depth of the display as returned by calling display->screenDepth().

IlvBitmap::IlvBitmap	(	IlvDisplay *	display,
		IlvWindowsHandle	hBitmap,
		IlBoolean	owner = IlFalse
	)

Constructor from an HBITMAP.

Initializes a bitmap from a Windows handle to a bitmap (HBITMAP). The width, height, and depth are retrieved directly from the HBITMAP.

Parameters

display	A pointer to an IlvDisplay.
hBitmap	The HBITMAP.
owner	A Boolean that indicates whether the object must delete the HBITMAP when this parameter is IlTrue or not delete it when this parameter is IlFalse.

Member Function Documentation

IlBoolean IlvBitmap::computeMask

(

)

Computes the mask of this bitmap.

This member function computes a monochrome mask of the image currently stored in this bitmap. This mask is used to draw this bitmap transparently. The mask has the same dimensions as this bitmap, but every pixel of the original image that matches the transparent color index will be converted to a '0' bit in the output mask (see setTransparentColorIndex). All other pixels will result in a '1' in the mask. The original image may be modified after a call to computeMask.

Returns

IlTrue if the mask is successfully computed (that is, there is a transparent color index that was used to compute the image mask). If the original bitmap is monochrome, or if the transparent color index has not been set, then this member function returns IlFalse.

IlUShort IlvBitmap::depth ( ) const

virtual

Retrieves the depth of this bitmap.

Returns

The depth of the bitmap.

Reimplemented from IlvSystemPort.

IlvBitmapAnimationHandler* IlvBitmap::getAnimationHandler

(

)

const

Returns the animation handler connected to this bitmap.

Returns

The animation handler connected to this bitmap, or 0 if there's none.

See Also

IlvBitmapAnimationHandler, setAnimationHandler

IlvBitmap* IlvBitmap::getMask

(

)

const

Retrieves the mask of this bitmap.

Returns

The image mask bitmap, or 0 if there is none (that is, the bitmap has no transparent area).

const char* IlvBitmap::getName

(

)

const

Retrieves the name of this bitmap.

Returns

The name of the bitmap object, if any was set.

IlInt IlvBitmap::getTransparentColorIndex

(

)

const

Retrieves the transparent color of this bitmap.

Returns

The index of the color that must be considered as transparent in the bitmap. This index will be used to compute the image mask when the bitmap is first requested to be displayed as transparent. It is automatically updated when creating the bitmap from a bitmap file that stores the transparent color information. A returned value of -1 means that this bitmap has no transparent color.

virtual IlBoolean IlvBitmap::isABitmap ( ) const

virtual

Queries the nature of this port.

Returns

A Boolean value that is always IlTrue.

Reimplemented from IlvSystemPort.

void IlvBitmap::lock

(

)

Locks the bitmap.

You must call this function if you want this bitmap to be shared among different objects (such as in the IlvIcon class).

virtual IlBoolean IlvBitmap::save ( const char *  filename ) const

virtual

Saves the bitmap to a file.

Writes out the binary description of the image.

Parameters

filename

The filename of the file where this bitmap is saved.

Returns

IlTrue if the save is successful, and IlFalse otherwise.

virtual IlBoolean IlvBitmap::save ( ostream &  stream ) const

virtual

Saves a bitmap to a stream.

Writes out the binary description of the image.

Parameters

stream

The output stream where this bitmap is saved.

Returns

IlTrue if the save is successful, and IlFalse otherwise.

IlBoolean IlvBitmap::saveAscii

(

const char *

filename

)

const

Saves an ASCII representation of this bitmap to a file.

The description of this IlvBitmap image will be stored in XBM (black and white) or XPM (color) format. This makes it easier, for example, to transfer your images from one site to another. The IlvDisplay class has a member function that lets you read from this new format (see IlvDisplay::readAsciiBitmap).

Parameters

filename

The filename of the file where this bitmap is saved.

Returns

IlTrue if the save is successful, and IlFalse otherwise.

void IlvBitmap::setAnimationHandler

(

IlvBitmapAnimationHandler *

handler

)

Sets the animation handler connected to this bitmap.

The animation handler is deleted when the bitmap will be deleted.

Parameters

handler

The animation handler.

See Also

IlvBitmapAnimationHandler, getAnimationHandler

void IlvBitmap::setMask

(

IlvBitmap *

mask

)

Sets the mask of this bitmap.

The previous mask is unlocked, and the new mask is locked.

Parameters

mask	The new mask of this bitmap.

void IlvBitmap::setName

(

const char *

name

)

Sets the name of this bitmap.

Parameters

name	The string that is copied as the new name of this bitmap.

void IlvBitmap::setTransparentColorIndex

(

IlInt

tcIndex

)

Sets the transparent color of this bitmap.

Parameters

tcIndex

The new transparent color index of this bitmap.

void IlvBitmap::unLock

(

)

Unlocks the bitmap.

If no more objects are locking this bitmap, it will then be destroyed.

void IlvBitmap::useColor

(

IlvColor *

color

)

Verbose:

Indicates that the color referred to as color is used in this bitmap. The effect of this function call is that the color will be locked, and referenced to be unlocked when the bitmap is destroyed.

Parameters

color

The color that this bitmap is indicated to use.