Stretchblt issue

Hi,

I have an issue, while trying to zooming the captured image.
I am using BitBlt method to copy the device context of the window to
the memory DC(CDC).

m_MemDc.BitBlt(0, 0, m_iWidth, m_iHeight, pDC, 0, 0, SRCCOPY);
m_memDC is the variable of object CDC

pDC is a pointer variable to object CDC, which contains the window to
be zoomed.

Then I am using Stretchblt method to copy the memory DC to the client
DC to zoom to the required level

dc.StretchBlt(0, 0, m_iZoomLevel*m_iWidth, m_iZoomLevel*m_iHeight,
&m_MemDc,
0, 0, m_iWidth, m_iHeight, RCCOPY);

Instead of copying (zooming) the image to the destination width and
height, it draws the image with in the screen size.

Please let me know if I need to change something.

Thanks and Regards
Srinivasan

Herojit
Tue Apr 10 04:46:50 CDT 2007

Hi,

Everything seems fine. The only problem can be if the HBITMAP in pDC
is not large enough
to hold the final zoomed bitmap.

Regards,
Herojit



On Apr 6, 12:20 pm, "Srini" <srinivasan...@gmail.com> wrote:
> Hi,
>
> I have an issue, while trying to zooming the captured image.
> I am using BitBlt method to copy the device context of the window to
> the memory DC(CDC).
>
> m_MemDc.BitBlt(0, 0, m_iWidth, m_iHeight, pDC, 0, 0, SRCCOPY);
> m_memDC is the variable of object CDC
>
> pDC is a pointer variable to object CDC, which contains the window to
> be zoomed.
>
> Then I am using Stretchblt method to copy the memory DC to the client
> DC to zoom to the required level
>
> dc.StretchBlt(0, 0, m_iZoomLevel*m_iWidth, m_iZoomLevel*m_iHeight,
> &m_MemDc,
> 0, 0, m_iWidth, m_iHeight, RCCOPY);
>
> Instead of copying (zooming) the image to the destination width and
> height, it draws the image with in the screen size.
>
> Please let me know if I need to change something.
>
> Thanks and Regards
> Srinivasan

Srini
Tue Apr 10 05:11:19 CDT 2007

Hi,

Thanks for your reply. Actualy the code was working in WM 5.0.
But now I am testing it in WM 6.0. It is not working now.
Do you have any idea about this strange issue?

Thanks and Regards
Srini
On Apr 10, 2:46 pm, "Herojit" <heroj...@gmail.com> wrote:
> Hi,
>
> Everything seems fine. The only problem can be if the HBITMAP in pDC
> is not large enough
> to hold the final zoomed bitmap.
>
> Regards,
> Herojit
>
> On Apr 6, 12:20 pm, "Srini" <srinivasan...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > I have an issue, while trying to zooming the captured image.
> > I am using BitBlt method to copy the device context of the window to
> > the memory DC(CDC).
>
> > m_MemDc.BitBlt(0, 0, m_iWidth, m_iHeight, pDC, 0, 0, SRCCOPY);
> > m_memDC is the variable of object CDC
>
> > pDC is a pointer variable to object CDC, which contains the window to
> > be zoomed.
>
> > Then I am using Stretchblt method to copy the memory DC to the client
> > DC to zoom to the required level
>
> > dc.StretchBlt(0, 0, m_iZoomLevel*m_iWidth, m_iZoomLevel*m_iHeight,
> > &m_MemDc,
> > 0, 0, m_iWidth, m_iHeight, RCCOPY);
>
> > Instead of copying (zooming) the image to the destination width and
> > height, it draws the image with in the screen size.
>
> > Please let me know if I need to change something.
>
> > Thanks and Regards
> > Srinivasan- Hide quoted text -
>
> - Show quoted text -

Jeffrey
Fri Apr 13 15:41:44 CDT 2007

Use GetDeviceCaps to check that your device supports the RC_STRETCHBLT
capability.

--
Jeffrey Min
Software Development Engineer
Microsoft Corp.

This posting is provided "AS IS" with no warranties, and confers no rights.

"Srini" <srinivasan222@gmail.com> wrote in message
news:1176199879.137527.262640@n76g2000hsh.googlegroups.com...
> Hi,
>
> Thanks for your reply. Actualy the code was working in WM 5.0.
> But now I am testing it in WM 6.0. It is not working now.
> Do you have any idea about this strange issue?
>
> Thanks and Regards
> Srini
> On Apr 10, 2:46 pm, "Herojit" <heroj...@gmail.com> wrote:
>> Hi,
>>
>> Everything seems fine. The only problem can be if the HBITMAP in pDC
>> is not large enough
>> to hold the final zoomed bitmap.
>>
>> Regards,
>> Herojit
>>
>> On Apr 6, 12:20 pm, "Srini" <srinivasan...@gmail.com> wrote:
>>
>>
>>
>> > Hi,
>>
>> > I have an issue, while trying to zooming the captured image.
>> > I am using BitBlt method to copy the device context of the window to
>> > the memory DC(CDC).
>>
>> > m_MemDc.BitBlt(0, 0, m_iWidth, m_iHeight, pDC, 0, 0, SRCCOPY);
>> > m_memDC is the variable of object CDC
>>
>> > pDC is a pointer variable to object CDC, which contains the window to
>> > be zoomed.
>>
>> > Then I am using Stretchblt method to copy the memory DC to the client
>> > DC to zoom to the required level
>>
>> > dc.StretchBlt(0, 0, m_iZoomLevel*m_iWidth, m_iZoomLevel*m_iHeight,
>> > &m_MemDc,
>> > 0, 0, m_iWidth, m_iHeight, RCCOPY);
>>
>> > Instead of copying (zooming) the image to the destination width and
>> > height, it draws the image with in the screen size.
>>
>> > Please let me know if I need to change something.
>>
>> > Thanks and Regards
>> > Srinivasan- Hide quoted text -
>>
>> - Show quoted text -
>
>

Srini
Mon Apr 16 23:25:38 CDT 2007

Thanks for your reply.

My device supports RC_STRETCHBLT capability. The same code works in
the landscape mode of the same device.
But not working in the portrait mode. Please let me know if anyone
come across this kind of issue.

Thanks and Regards
Srini


On Apr 14, 1:41 am, "Jeffrey Min [MSFT]"
<jeff...@REMOVE.SPAM.online.microsoft.com> wrote:
> Use GetDeviceCaps to check that your device supports the RC_STRETCHBLT
> capability.
>
> --
> Jeffrey Min
> Software Development Engineer
> Microsoft Corp.
>