Doesn't show rectangular bitmaps right

The_Minister · 2000-04-24T16:03:14

Yo guys, this problem is frying my brain. I am writing an API based on DirectX for my game, and I have just finished displaying bitmaps, with my own load functions etc. So I load the bitmap, make a surface for it and copy it, pixel by pixel, to the surface. Then I ditch the bitmap''s old buffer. This works great for square bitmaps, but not for rectangular ones. When I blit a rectangular one, it appears heavily distorted. I first thought this was some stupid mistake when I was using Width instead of height, and because they are square it didn''t matter, but I went through the code over and over and I can''t find a single place that I did this in. I suspect the function that copies the buffer to the surface, shown here: int Bitmap::CopyBitmapToSurface (BITMAP_FILE_PTR bitmap, LPDDSURFACEDESC2 ddsd) { UCHAR *Surface = (UCHAR *)ddsd->lpSurface; // the drawing surface // copy pixel by pixel for (int index_y = 0; index_y < bitmap->InfoHeader.biHeight; index_y++) for (int index_x = 0; index_x < bitmap->InfoHeader.biWidth; index_x++) Surface[index_x + index_y * int(ddsd->lPitch)] = bitmap->buffer[index_x + index_y * bitmap->InfoHeader.biWidth]; return 1; } If this seems perfect, like it does to me, then the problem must be somewhere else... Anyways thanks for your time, and if you can help me, well that''s even better. The_Minister

Graphics and GPU Programming Programming

Started by The_Minister April 23, 2000 10:00 AM

15 comments, last by The_Minister 24 years ago

The_Minister

122

Author

April 23, 2000 02:12 PM

Okay I looked it up in the help file.

Width is 250, and height is 200, as it should be.
Printed right after the bitmap was loaded.

Any takers?

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

SHilbert

652

April 23, 2000 05:08 PM

Is there a pitch value in the BITMAPINFOHEADER structure?

lntakitopi@aol.com
http://geocities.com/guanajam/

goir

122

April 23, 2000 05:22 PM

I had the same problem a few days ago I think.

My solution was making all the bitmaps I load in sizes that are dividable by 8.
250/8=31,25 (not good)
200/8=25 (good)

Try it.

I think it''s DirectX that can''t handle other sizes

The_Minister

122

Author

April 23, 2000 05:31 PM

SHilbert: No there isn''t, and I don''t think there needs to be.

goir: Good idea, but one of the bitmaps in the screenshot is 300x300, not divisable by eight

. Are you saying that maybe DirectDraw can''t blit surfaces that are not divisable by eight? Or maybe it''s divisable by four, not eight, as that would work with 300? Intriguing notion... But still that is a bit of a restriction.
Did your bitmap get spliced up like mine? BTW is that screenie even coming through, because I think xoom.com is messing me around again...
Also there is no mention of this in the SDK that I have seen... still I will try it... 200x400 sounds fair enough.

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

The_Minister

122

Author

April 24, 2000 05:26 AM

Holy Cr@p it works

. /me smothers goir in kisses.. wait... no

.

Thanks guys

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

goir

122

April 24, 2000 03:25 PM

What happed to my bitmaps was that they looked like every row was pushed a bit to the left (or right, I don''t remember). Kina like what I mad below
/ / / / /
/ / / / /
/ / / / /
/ / / / /
/ / / / /
/ / / / /

Also the colors was messed up and looked a little like black and white (but there were other colors aswell).

and I can''t see that ''screenie'' all I see is an xoom logo.

I think you can solve the problem by making the surface in a multiple of 8 and then only use part of the surface when you blit, but I haven''t tried.

The_Minister

122

Author

April 24, 2000 04:03 PM

Yeah that''s exactly what I got, thanks. I will have to do a bit of el hacko to get this right.

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

Doesn't show rectangular bitmaps right

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