Image Buffer Ku-Yaw Chang canseco@mail.dyu.edu.tw Assistant Professor, Department of Computer...

Image BufferImage Buffer

Ku-Yaw ChangKu-Yaw Changcanseco@mail.dyu.edu.twcanseco@mail.dyu.edu.tw

Assistant Professor, Department of Assistant Professor, Department of Computer Science and Information EngineeringComputer Science and Information Engineering

Da-Yeh UniversityDa-Yeh University

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OutlineOutline

Image BufferImage Buffer

Tools libraryTools library

DocumentDocument

ViewView

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Image BufferImage Buffer

Image BufferImage Buffer LogicallyLogically

2 dimensional array2 dimensional array Physically (in memory)Physically (in memory)

Usually 1 dimensional arrayUsually 1 dimensional array

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Image BufferImage Buffer

A 512 * 512 image (logically)A 512 * 512 image (logically) 2-byte per pixel2-byte per pixel Max gray level = 4095 Max gray level = 4095

W = 512

H = 512

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Image BufferImage Buffer

A 512 * 512 image (physically)A 512 * 512 image (physically) 2-byte per pixel 2-byte per pixel

Create (allocate)Create (allocate) short * pImage = (short *)short * pImage = (short *)

malloc(512*512*sizeof(short)); malloc(512*512*sizeof(short));

Use (access)Use (access) *(pImage+y*512+x) = 4095*(pImage+y*512+x) = 4095

Destroy (free)Destroy (free) free(pImage)free(pImage)

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Tools LibraryTools Library

Providing a function to display a 2-byte Providing a function to display a 2-byte image buffer on the screenimage buffer on the screen void ShowImage_2B(CDC * pDC, short * void ShowImage_2B(CDC * pDC, short *

pImage, int nWidth, int nHeight);pImage, int nWidth, int nHeight);

Consisting ofConsisting of tools.libtools.lib tools.htools.h

Adding these two files into your project.Adding these two files into your project.

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DocumentDocument

C***Document : public CDocumentC***Document : public CDocument

Add dataAdd data Image bufferImage buffer

short * m_pImage;short * m_pImage;

int m_nWidth;int m_nWidth;

int m_nHeight;int m_nHeight;

Add core functionsAdd core functions short * GetImageBuffer()short * GetImageBuffer() int GetImageWidth()int GetImageWidth() int GetImageHeight()int GetImageHeight()

Constructor (C***Document)Constructor (C***Document)InitializationInitialization

Destructor (~C***Document)Destructor (~C***Document)Release resourcesRelease resources

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ViewView

C***View : public CViewC***View : public CView

Process WM_PAINT messageProcess WM_PAINT message #include “tools.h”#include “tools.h” C***View::OnDraw(CDC * pDC)C***View::OnDraw(CDC * pDC)

{{ ShowImage_2B( ShowImage_2B( pDC, pDC, pDoc->GetImageBuffer(), pDoc->GetImageBuffer(), pDoc->GetImageWidth(), pDoc->GetImageWidth(), pDoc->GetImageHeight() ); pDoc->GetImageHeight() );}}

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ResultResult

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ResultResult