GPixmapScaler Class Reference

Fast rescaling code for color images. More...

#include <GScaler.h>

Inheritance diagram for GPixmapScaler:

[legend]

List of all members.

Public Member Functions
void	scale (const GRect &provided_input, const GPixmap &input, const GRect &desired_output, GPixmap &output)
virtual	~GPixmapScaler ()
Static Public Member Functions
static GP< GPixmapScaler >	create (const int inw, const int inh, const int outw, const int outh)
static GP< GPixmapScaler >	create (void)
Protected Member Functions
GPixel *	get_line (int, const GRect &, const GRect &, const GPixmap &)
	GPixmapScaler (int inw, int inh, int outw, int outh)
	GPixmapScaler (void)
Protected Attributes
GPBufferBase	glbuffer
GPBufferBase	gp1
GPBufferBase	gp2
int	l1
int	l2
GPixel *	lbuffer
GPixel *	p1
GPixel *	p2

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Detailed Description

Fast rescaling code for color images.

This class augments the base class {GScaler} with a function for rescaling color images. Function {GPixmapScaler::scale} computes an arbitrary segment of the output image given the corresponding pixels in the input image.

{ Example} --- The following functions returns a color image of size nw# by nh# containing a rescaled version of the input image in#. {verbatim} GPixmap *rescale_pixmap(const GPixmap &in, int nw, int nh) { int w = in.columns(); // Get input width int h = in.raws(); // Get output width GPixmapScaler scaler(w,h,nw,nh); // Creates bitmap scaler GRect desired(0,0,nw,nh); // Desired output = complete image GRect provided(0,0,w,h); // Provided input = complete image GPixmap *out = new GPixmap; scaler.scale(provided, in, desired, *out); // Rescale return out; } {verbatim}

Definition at line 259 of file GScaler.h.

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Constructor & Destructor Documentation

GPixmapScaler::GPixmapScaler

(

void

)

[protected]

Definition at line 499 of file GScaler.cpp.

GPixmapScaler::GPixmapScaler	(	int	inw,
		int	inh,
		int	outw,
		int	outh
	)			[protected]

Definition at line 507 of file GScaler.cpp.

GPixmapScaler::~GPixmapScaler

(

)

[virtual]

Virtual destructor.

Definition at line 517 of file GScaler.cpp.

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Member Function Documentation

static GP<GPixmapScaler> GPixmapScaler::create	(	const int	inw,
		const int	inh,
		const int	outw,
		const int	outh
	)			[inline, static]

Creates a GPixmapScaler.

The size of the input image is given by inw# and inh#. This function internally calls {GScaler::set_input_size} and {GScaler::set_output_size}. The size of the output image is given by outw# and outh#. .

Definition at line 277 of file GScaler.h.

static GP<GPixmapScaler> GPixmapScaler::create

(

void

)

[inline, static]

Creates an empty GPixmapScaler.

You must call functions {GScaler::set_input_size} and {GScaler::set_output_size} before calling any of the scaling functions.

Definition at line 271 of file GScaler.h.

GPixel * GPixmapScaler::get_line	(	int	fy,
		const GRect &	required_red,
		const GRect &	provided_input,
		const GPixmap &	input
	)			[protected]

Definition at line 523 of file GScaler.cpp.

void GPixmapScaler::scale	(	const GRect &	provided_input,
		const GPixmap &	input,
		const GRect &	desired_output,
		GPixmap &	output
	)

Computes a segment of the rescaled output image.

The pixmap output# is overwritten with the segment of the output image specified by the rectangle desired_output#. The rectangle provided_input# specifies which segment of the input image is provided in the pixmap input#. An exception {GException} is thrown if the rectangle provided_input# is smaller then the rectangle required_input# returned by function {GScaler::get_input_rect}.

Definition at line 594 of file GScaler.cpp.

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Member Data Documentation

GPBufferBase GPixmapScaler::glbuffer [protected]

Definition at line 295 of file GScaler.h.

GPBufferBase GPixmapScaler::gp1 [protected]

Definition at line 297 of file GScaler.h.

GPBufferBase GPixmapScaler::gp2 [protected]

Definition at line 299 of file GScaler.h.

int GPixmapScaler::l1 [protected]

Definition at line 300 of file GScaler.h.

int GPixmapScaler::l2 [protected]

Definition at line 301 of file GScaler.h.

GPixel* GPixmapScaler::lbuffer [protected]

Definition at line 294 of file GScaler.h.

GPixel* GPixmapScaler::p1 [protected]

Definition at line 296 of file GScaler.h.

GPixel* GPixmapScaler::p2 [protected]

Definition at line 298 of file GScaler.h.

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The documentation for this class was generated from the following files:

• GScaler.h
• GScaler.cpp