QJpegHandlerPrivate Class Reference

Public Types
enum	State { Ready, ReadHeader, Error }

Public Functions
	QJpegHandlerPrivate (QJpegHandler *qq)
bool	read (QImage *image)
bool	readJpegHeader (QIODevice *)
	~QJpegHandlerPrivate ()

Public Variables
QRect	clipRect
struct my_error_mgr	err
QImage::Format	format
struct jpeg_decompress_struct	info
struct my_jpeg_source_mgr *	iod_src
QJpegHandler *	q
int	quality
QRect	scaledClipRect
QSize	scaledSize
QVariant	size
State	state

Detailed Description

Definition at line 684 of file qjpeghandler.cpp.

Enumerations

State

enum QJpegHandlerPrivate::State

Enumerator
Ready
ReadHeader
Error

Definition at line 687 of file qjpeghandler.cpp.

               {
        Ready,
        ReadHeader,
        Error
    };

Constructors and Destructors

QJpegHandlerPrivate()

QJpegHandlerPrivate::QJpegHandlerPrivate ( QJpegHandler *  qq )

inline

Definition at line 693 of file qjpeghandler.cpp.

        : quality(75), iod_src(0), state(Ready), q(qq)
    {}

~QJpegHandlerPrivate()

QJpegHandlerPrivate::~QJpegHandlerPrivate ( )

inline

Definition at line 697 of file qjpeghandler.cpp.

    {
        if(iod_src)
        {
            jpeg_destroy_decompress(&info);
            delete iod_src;
            iod_src = 0;
        }
    }

Functions

read()

bool QJpegHandlerPrivate::read

(

QImage *

image

)

Definition at line 763 of file qjpeghandler.cpp.

Referenced by QJpegHandler::read().

{
    if(state == Ready)
        readJpegHeader(q->device());

    if(state == ReadHeader)
    {
        bool success = read_jpeg_image(image, scaledSize, scaledClipRect, clipRect, quality,  &info, &err);
        state = success ? Ready : Error;
        return success;
    }

    return false;

}

readJpegHeader()

bool QJpegHandlerPrivate::readJpegHeader

(

QIODevice *

device

)

Warning

This function is not part of the public interface.

Definition at line 728 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option().

{
    if(state == Ready)
    {
        state = Error;
        iod_src = new my_jpeg_source_mgr(device);

        jpeg_create_decompress(&info);
        info.src = iod_src;
        info.err = jpeg_std_error(&err);
        err.error_exit = my_error_exit;

        if (!setjmp(err.setjmp_buffer)) {
            (void) jpeg_read_header(&info, TRUE);

            int width = 0;
            int height = 0;
            read_jpeg_size(width, height, &info);
            size = QSize(width, height);

            format = QImage::Format_Invalid;
            read_jpeg_format(format, &info);
            state = ReadHeader;
            return true;
        }
        else
        {
            return false;
        }
    }
    else if(state == Error)
        return false;
    return true;
}

Properties

clipRect

QRect QJpegHandlerPrivate::clipRect

Definition at line 715 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option(), and QJpegHandler::setOption().

err

struct my_error_mgr QJpegHandlerPrivate::err

Definition at line 718 of file qjpeghandler.cpp.

format

QImage::Format QJpegHandlerPrivate::format

Definition at line 712 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option().

info

struct jpeg_decompress_struct QJpegHandlerPrivate::info

Definition at line 716 of file qjpeghandler.cpp.

iod_src

struct my_jpeg_source_mgr* QJpegHandlerPrivate::iod_src

Definition at line 717 of file qjpeghandler.cpp.

q

QJpegHandler* QJpegHandlerPrivate::q

Definition at line 722 of file qjpeghandler.cpp.

quality

int QJpegHandlerPrivate::quality

Definition at line 710 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option(), QJpegHandler::setOption(), and QJpegHandler::write().

scaledClipRect

QRect QJpegHandlerPrivate::scaledClipRect

Definition at line 714 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option(), and QJpegHandler::setOption().

scaledSize

QSize QJpegHandlerPrivate::scaledSize

Definition at line 713 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option(), and QJpegHandler::setOption().

size

QVariant QJpegHandlerPrivate::size

Definition at line 711 of file qjpeghandler.cpp.

Referenced by QJpegHandler::option().

state

State QJpegHandlerPrivate::state

Definition at line 720 of file qjpeghandler.cpp.

Referenced by QJpegHandler::canRead().

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

• /src/gui/image/qjpeghandler.cpp